1. A cotntnutiication tnetllod for use in a wireless coti~tnu~iicationsy stem, comprising: detesnlitiing, by a base station in the coi~u~~unicatsiyosnte m, a classification of a configuration of enhanced control channel elements it1 an enhanced physical do\vnlitik control cha~nlel according to a current systetil configuration of the communication system, wherein the configuration of enlianced control cliannel eletiients comprises the nnuiber of resource elements in each enhanced control channel element and the nunlber of enlianced control channel eletilents in each physical resource block pair, and \\~I~escittlii e configuration of enl~aticedc ontrol channel elements is classified into a plurality of classifications whicli respectively correspond to different system configurations of the communication system; and noti6ing a terminal node in tlie co~inllunication system of infomiation on the deter~nined classification of the configt~ration of the enhanced control cliatmel elements.

2. Tlie comln~~~iicatimoetit hod of clainl 1, wherein the system configuration coiilprises the number of OFDMA symbols carried by the pl~ysicald ownlink control channel and the nutiiber of reference signal ports.

3. The communication method of claitii 1, wherein tlie co~ifiguration of the enhanced control chatmcl elements is classified into 4 classifications respectively corresponding to different system config~~ratiotoisf the comn~unications ystem.

4. The coinnlunication nletliod of claim 3, wherein notifying the tcrtllitial node of tlie information oti the deterniined classifications of the configuration of the enhanced control channel elements comprises: packaging the infosmation on the determined classifications of the configuration of tlie enhanced control chatniel elenients into a first signaling of 2 bits; and transnlitting the first signaling to the teriilitial node.

5. The commu~iication method of any of claims 1-4, wherein deternlitiing the classification of the configuration of the enlianced control channel elctnents coniprises: determining tlie classification of the configuration of the enlianced control chatmcl elenients according to tlie nuniber of resource elctilents in one pl~ysical resource block pair available to carry tlie enlianced physical do\vnli~kc ontrol cliatulel, wherein: in a first classification, each enlianced control channel eletiletit comprises 32 or 34 resource elements, and each physical resource block pair cat~ies 4 enhanced control channel elements; in a second classification, each enlianced control cl~antiele lenlent co~ilpsises3 0 or 32 resource eletnents, and each pl~ysical resource block pair carries 4 enlianced control cliatu~eel lements; Sony China Ref.: CNPA120241N00 Sony Ref.: SP3468331N00 Our Ref.: OP1413-06-0101 in a third classification, eacli enhanced control chanu~ele le~ne~clotm prises 36 or 38 resource elements, and eacli physical resource block pair carries 3 enhanced control channel elements; and in a fourth classification, eaclt enhanced control chatme1 elenlent comprises 30 or 33 resource elements, and each physical resource block pair carries 3 enhanced control channel elements.

6. The comtnunication method of claitli 4, wherein tlie first signaling is an extension of an existing physical do\vnlink co~ltrol channel signaling or an enhanced physical downlink control channel signali~ig.

7. The communication nlcthod of claim 4, wvl~erein transmitting the first signaling to the ter~ninaln ode comprises: transmitting the first signaling to tlie ter~ninal node by using an unoccupied resource element in the enhanced physical do\vnliink control channel.

8. The comtnunication method of any of claitns 1-4, furtl~ecr omprising: for each physical resource block pail; napping a plurality of enhanced channel control elements irtto a plurality of resource ele~nentso f the pl~ysicalr esource block pair, wlierein the plurality of enhatlced channel cotitrol ele~ne~lotsf the physical resource block pair are contiguously mapped into the plurality of resource elements according to a diago~iallya rranged pattern.

9. The communication metl~odo f claim 8, wherein u~ioccupiedr esource elements in the pl~ysicalr esource block pair are mapped, according to a unifortnly distributed pattern, preceding or follo\viilg each enhanced coiltrol channel element.

10. The communication metliod of claim 8, \vI~erein the etlhatlced physical dolvnlink control channel is mapped into one physical resource block pair in a Iocalizcd lnanner or mapped into a plurality of physical resource block pairs in a distributed malnler.

11. A coniniunication metliod for use in a \\ireless communication system, conlprising: receiving, by a terminal node it1 the colnm~~nicatiosny stem from a base station it1 tlie communication system, inforniatiotl on classificatio~ol f configuratioa of enhanced colltrol cha~nlel elements, \vlierein the configuration of c~lhanced control channel ele~nents conlprises tlie number of resource eletnents in each enhanced co~itrol channel eletnent and the nu~nber of enhanced control charutel ete~nents in eaclt physical resource block pail; and wherein the configuration of enhanced control channel elements is classified illto a plurality of classifications which respectively correspond to different system configurations of the communication system; and performing detnodulation for the enhanced co~itrolc hannel ele~nentsa ccording to the classification of the configuration of e~lhancetcl o~ltrocl hannel elements.

12. Tlie communication method of claim 11, wherein receiving the information 011 the classification of the configuratio~l of enllaticcd cotitrol channel cle~nents Sony China Ref.: CNPA120241N00 Sony Ref.: SP3468331N00 Our Ref.: OP1413-06-0101 comprises: receiving a first signaling of 2 bits in \vhich the infonuation on the classification of the configuratioti of e~lfianced control channel elenlents is packaged.

13. The conlnlunication method of claim 11, wherein receiving the infomtation on the classificatio~l of the configuration of enhanced control chatulel elements co~ilprises: receiving information on physical co~ltroflo rmat indication channel; calculating the nunlber of resource eletnents available to carry the enhanced physical dolvnlink control channel based on the inforn~ation on physical control forlnat indication channel, atid obtaining the classification of the configuration of enhanced control channel elements by querying a pre-stored table containing configurations of enhanced control channel elements.

14. The comtnunication tnethod of any of claitns 11-13, wherein the configuration of e~lflancedc ontrol channel ele~nentsis classified into 4 classifications.

15. The comn~unicationm ethod of claim 14, wherein: it1 a first classification, each enhanced control channel elenlent cotnprises 32 or 34 resource elements, and each physical resource block pair carries 4 enhanced control channel elements; in a second classification, each enhanced control channel element comprises 30 or 32 resource elcn~cnts, and each physical resource block pair carries 4 enhauced co~ltrocl hannel eletnents; in a third classification, each enhanccd control channel elenlent comprises 36 or 38 resource elements, and each physical resource block pair carries 3 enhanced control channel elements; and in a fourth classification, each enhanced control channel clement comprises 30 or 33 resource elcmc~lts, and each physical rcsource block pair carries 3 enhanced control channel elements.

16. The cotntn~~nicatiotnn ethod of any of claims 11-13, v~hereint he terlninal node contiguously den~odulates a plurality of resource elenlents in the pllysical resource block pair in a diagonally arranged lilanncr to obtain the respective enhanced control cliant~eel lements.

17. The communication ruethod of clainl 16, wherein unoccupied resource elements in the physical resource block pair are mapped, according to a uniformly distributed pattern, follo\\~inge ach e~lhancedc ontrol clia~uleel lement, and wherein the terlninal node skips the unoccupied resource elenlents after performing the demodulation for each enhanced control chatmcl element, or unoccupied resource elenlents in the physical resource block pair are mapped, according to a uniformly distrib~~tepdat tern, preceding each enhanced control channcl Sony China Ref.: CNPA120241N00 Sony Ref.: SP3468331N00 Our Ref.: OP1413-06-0101 element, and \vhereiri the tertninal node skips the unoccupied resource elenlcnts before perfomling the deniodulation for each enhanced control channel element.

18. The conntn~~~icantlcitoh~od~ of claim 16, wherein the tenninal node performs de~nodulation for enhanced control cllannel elcnlents in one physical resource block pair in a localized manner to obtain an enhanced pllysical downlink control cha~ulel, or the ternlinal node perfonns detnodulation for enhanced control channel elements in a plurality of pl~ysicalr esource block pairs to obtain an enhanced physical downlink control chantlei.

19. A con~munication apparatus for use in a wireless communication system, configured in a base station of the communication system and comprising: a configuration classification determining device configured to deterniine a classification of configuration of enhanced control channel elements in an enhanced pl~ysical downlink control channel according to current systenl configuration of the conl~llunication system, wherein the configuration of e~lhanccd control channel ele~nents comprises the nunlber of resource elements in each elhanced control channel ele~nent and the n~itnber of enhanced control channel elenlents in each ~~hysicarel source block pair, and wllerein the configuration of enhanced control channel elements is classified into a plurality of classifications which respectively correspond to different system configurations of the co~itnlunications ystem; and a transmitting device config~~retod notify a terniinal node in the cotntn~t~~icatio~~ system of information on the deter~nined classification of the configuration of enhanced control channel elements.

20. A conununication apparatus for use in a wireless conimunication system, configured in a tertninal node of the con~nlunicationsy stenl and comprising: a receiving device configured to receive inforntation on classification of configuration of etll~anccdc ontrol channel elements transmitted from a base station in the communication system, wherein the configuration of enhanced control cha~ulel elements comprises the number of resource elenlcnts in each enhanced control channel elenlent and the nuinher of enhanced control channel elements in each physical rcsourcc block pair, and wherein the configuration of enhanced control channel elenients is classified into a plu~ality of classifications which respcctively correspond to different system coilfigurations of the commnt~ication system; and a processing dcvicc configured to perfomi demodulation for the enhanced control chatulel elenients according to the classification of the configuration of enhanced control channel elements.

21. A conlnnnlication method for use in a wireless co~nnninication system, comprising: determining, by a base station in the communication systcnl, a classification of configuration of e~lhanccdc ontrol channel eletnents in an enhanced physical dowvnlink control channel according to currcnt systcm configuration of the communication system, wherein the configuration of enhanced control chatnlel elements comprises Sony China Ref.: CNPA120241N00 Sony Ref.: SP3468331N00 Our Ref.: OP1413-06-0101 tlie nulnber of resource elements in each elharlced control cha~u~eelle ~nenta nd the number of eilhanced control channel elements in each pliysical resource block pail; and \vllerein the configuration of enhanced co~ltrolc liamiel elements is classified illto a plurality of classifications \vI~icli respectively correspolid to diffe~.eiit system configuratio~lso f the colmnunication system; ~lotifying,b y the base station, a terlninal node in tlie co~lirnu~licatiosny stem of infonnation on the determined classificatio~ol f the co~ifiguratio~ofl enhanced coiltrol clia~u~eelle me~its; receivine, by the teniiinal node, the informatiou on the classificatioll o;' file configuration of enhanced control channel ele~llei~ttrsa ilsnliiicd fro111 the base staiion; aiid perfo~~uinbgy, tlie terlninal node, demnodulatiol~fo r the enhanced control channel elements according to the classification of the configuratioli of eullanced control channel elements.

22. A wireless con~lliutlications ystem, co~lq~risinag b ase station and a terlninal node, wherein the base station comprises: a configuration cI&sificatioll detertili~lil~dge vice colrfigured to deteriililie a classificatiori of configuration of ellliaiiced control cha~lnele le~nentsi n an eidianced physical downlink control clian~lela ccording to current system cot~figurationo f the .communicatio~-s ystem, ~vlierein the configuration of ellhanced control chainlel elelllellts co~liprises the nuiilber of rcsource elcments in each eilhanced coiltrol cliaiuiel element and tlie nulnber of enhanced coiltrol chalulel elellleilts in each pl~ysical resource block pail; and wherein the configuratioli of enhanced coiitrol cllal~nel eleme~its is classified into a plurality of classifications ~vhicli respectively cor1espond to different system configurations of the co~iuilunicatios~yis telu; and a trans~i~ittiiidge vice configured to notify a terminal node in the colluilunication system of inforlnatioll oli the determilied classificatioll of the collfiguration of enhanced co~ltrocl hatu~eel lemelits, and wherein the terminal node cotiip~.ises: a receiving devicc configured to reccive the illformatioil on the classification of the config~~ratiootlf enhanced corltrol cliaimel eletlients transmitted From the base station; and a processiiig device configured to perform deillodulatio~l for the erlliailced control channel elements accordilig to the classification of the co~lfiguratioli of e~lhancedc o~ltrocl l~a~uleelle ments.

TECHNICAL FIELD
[Ol] The present disclost~re relates to tlic filcd of wireless com~n~unicatioa~nd~ ,
particularly to a commn~~~iicatimone thod, a co~i~~nu~iicadteiovinc e aud a wireless
comtnunication system including such a communication device \vllicIi are used in for
exanlple subsequent evolution (LTE-A) of long term evolution of a Universal Mobile
Telecomnlunication Systern (UMTS).
BACKGROUND ART
1021 Long Term Evolution (LTE) of Universal Mobile Telecommunicatio~l System
(UMTS) technique is the biggest novel technique development project launched by
the 31d Generation Partnership Project (3GPP) in recent years. This technique can be
regarded as "quasi-4G technique". LTE-A (LI'E-Advanced) is subsequent evolution of
LTE. 3GPP completed a technique dernand report of LTE-A in 2008, addressing the
following minimuni denlands of the LTE-A: a downlink peak rate is 1 Gbps, au uplink
peak rate is SOOMbps, aud uplink and downlink peak spectrum utilization rates reach
lSMbps/I-Iz and 30Mbps/Hz respectively. I11 order to satisfy various demand indices
of 4G technique, 3GPP proposes several key techniques directed to LI'E-A, including
carrier aggregation, coordinated multi-point tra~lsnlission and reception, relay
transmission and multi-antenna enhancement, etc.
[03] A Physical Do\vnlink Control Channel (PDCCH) carried Downlink Control
Information (DCI), including resource allocation information and other control
inforniation on one or more User Equipmcnts (UEs). In tlie LTE, both uplink and
dowvnlink resource scheduling information are carried by the PDCCH. Generally
speaking, in one sub-frame there liiay be a plurality of PDCCHs. A user necessarily
demodulates the DCI in the PDCCHs first in order to demodulate Physical Dow\~nlink
Share Cliannel (PDSCH: including broadcast messages, paging, data of UEs, etc.) of
the user's owl at corresponding resource positions.
[04] Presently, in view of scl~ednlingd emands of the key tecliniqoes such as carrier
aggregation, coordinated multi-point transtnission and reception, relay trans~nission
and mnlti-antenna enliancement and so on, an Enhanced Physical Do\vnlink Control
Channel (ePDCCH) is proposed in 3GPP normalization, for enlarging capacity of
co~itrol infor~nation, and making it possible to support teclu~iqucs such as
beamfonning, diversity, deletion of interference between cells and so on. Since
co-existence with a PDCCH in a previous version 10 (e.g. R10) is desired, the
ePHCC1-I will not occupy a region of the previous PDCCH, but shares resources of
data donlains with a PDSCH. In this regard, it is necessary to re-design the
configuratiotl of thc cPDCCH.
SUMMARY OF THE INVENTION
[OS] In respect of tlie above defects, some enibodinlents of the disclosure provide a
commutiicatio~n~le tliod, device and system, wherein a configuration schetne of an
Sony China Ref.: CNPA120241N00
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enhanced Pliysical Downlink Control Channel (ePDCCH) as adopted can effect
efficient utilization of downlink resources, iniprove transmission performance and
enable excellent compatibility with a PDCCH in R10 (3GPP Release 10).
[06] Brief descriptions of the disclosure will be made hercinafiel; so as to provide
basic understandings to some aspects of the disclosure. It should be understood that
such brief descriptions are not enumerative descriptions in regard to the disclosure.
The brief descriptions neither intend to determine the key or important parts of the
disclosure nor intend to limit the scope of the disclosure, but aim only to provide
some concepts in a si~nplifiedm anner, which serve as a preamble of more detailed
descriptions provided later.
[07] According to one aspect of the disclosure, a co~lnnunicationm ethod in a wireless
conun~~nicationsy stem is provided. The commn~~nicationm ethod may include:
determining, by a base station in the comtn~unication system, a classification of
configuratioll of e~lliancedc ontrol channel elements in an e~diancedp hysical do\vnlink
control channel according to current systenl configuration of the communication
system, wl~erein the configuration of enhanced control channel elc~ilents includes
nunlber of resource elenlents in each enhanced co~ltrolc l~annele letnent and number
of enhanced control channel elements in each physical resource block pail; and
~vhereint he configuratio~o~f enhanced control channel elenlents is classified into a
plurality of classifications which respectively correspond to different system
configurations of the con~tnunication system; and notifying a ternlinal node in the
communication system of an infomation 011 the determined classification of the
configuration of enhanced control channel eletnents.
[08] According to another aspect of the disclosure, a communication tnethod in a
wireless corumunication system is fit-tlier provided. The conmnication method mav
include: receiving, by a tertninal node in the conn~iunication systcnl fi.0111 a base
station in the cotnmunication system, information on classification of config~trationo f
enhanced control cl~atn~elle ments, xvlierein the configuration of enhanced control
channel elenlents includes number of resource eletnents in each enhanced control
channel element and nnrnber of enhanced control channel elements in each physical
resource block pair, and wherein the config~tration of enhanced control cl~annel
ele~nentsi s classified into a plurality of classifications \\~hicIir espectively corrcspond
to different system configurations of the comtnutiication system; and performing
demodulation for the enhanced control channel eletlients according to the
classification of the configuration of enhanced control chantiel ele~ncnts.
[09] According to another aspect of the disclosure, a communication device in a
\vireless co~~inlunicatiosny stem is further provided. The communication device is
configured in a base station of the communication system and includes: a
configuration classification detern~ining device configured to determine a
classification of configuration of enhanced control cl~annel elements in an enhanced
physical downlink control cha~inel according to current system configuration of the -
communication systetn, wherein the configuration of e~lhanced control channel
elenlents includes number of resource elements in each enhanced control cl~annel
elenlent and nunlber of enl~anced control channel elenlents in each physical resource
2/23
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block pail; and wherein the configuration of enhanced control cha~ulel elements is
classified into a plurality of classifications which respectively correspond to different
system configurations of the communication system; and a transmitting device
configt~redt o notify a terminal node in the communication system of an information
on the determined classification of the configuration of enhanced control channel
elements.
[lo] According to another aspect of the disclosure, a comn~unication device in a
wireless communication system is further provided. The communication device may
be configured in a terminal node of the communication systenl and include: a
receiving device configured to receive infor~llationo n classification of configuration
of enhanced control channel elements transmitted fi.0111 a base station in the
cotnmunication system, wherein the configuration of enhanced control channel
elements includes number of resource elements in each enhanced control channel
elenlent and number of enhanced control channel elements in each physical resource
block pail; and wherein the configuration of enhanced control channel elements is
classified into a plurality of classifications \vhiclich respectively correspond to different
system configurations of the communication system; and a processing device
configured to perform demodulation for the enhanced control channel elenlents
according to the classification of the configuration of enhanced control channel
elemellts.
[Ill According to another aspect of the disclosure, a communication nlethod in a
wireless cotnmunication system is further provided. The method may include:
determining, by a base station in the comniunication system, a classification of
configuration of enhanced control channel cle~lle~litns an enhanced phj~sicald ownlink
contml channel according to current system configuration of the col~~munication
system, wherein the configuration of enhanced control channel elenlents includes
number of resource elements in each enhanced control cliarulel element and number
of enhanced control channel elenlents in each physical resource block pair, and
wherein the configuration of enhanced control channel elements is classified into a
plurality of classifications \vhich respectively correspond to different system
configurations of the co~n~il~~nicastyisotenm ; notifying, by the base station, a tcr~ninal
node in the communication system of an information on the determined classification
of the configu~ationo f enhanced control channel elements; receiving, by the tertninal
node, the inforlllation on the classification of the configuration of enhanced control
channel ele~rtentst ransmitted fi.0111 the base station; and performing, by the terniinal
node, deniodulatiorl for the enhanced control channel elements according to the
classification of the configuration of enl~ancedc ontrol channel elements.
[12] According to another aspect of the disclosure, a wireless communication system
is further provided. The system includes a base station and a terniinal node. The base
station may include: a configuration classification determining device configured to
deternline a classification of configuration of enhanced control chantiel elements in an
enhanced physical downlink control channel according to current system
configuration of the communication system, wherein the configuration of enhanced
control channel elements includes nun~bcr of resource eletilents in each enhanced
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
control channel eletilcnt and tiutnber of enhanced control clirmnel elenlents in each
pli~~sicarel source block pair, and wherein the configuration of enhanced control
channel elements is classified into a plurality of classifications \v11ich respectively
correspond to different systeni configurations of the conimutiication system; and a
transmitting devicc configured to notify a tertninal node in the conin~unicatiotsi ystem
of an inforruation on the determined classification of the configuration of enhanced
control channel elements, and m~hcreint he terminal node includes: a receiving device
configured to receive the information on the classification of the configuration of
enhanced control channel elements tratisniitted fro111 the base station; and a processing
device configured to perform denloditlation for tlie enhanced control chatx~eel lements
according to the classification of the configuration of enhanced control channel
elements.
[13] In addition, the disclosure further provides a computer progranl for carrying out
tlie above method.
1141 In addition, the disclosure also provides at least a cotilputer program product in
the for111 of a computer-readable nlcdium, on \vl~ich conlputer program code for
carrying out thc above method is recorded.
BRIEF DESCRIPTION OF THE DRAWINGS
[15] The above and other objects, features and advantages of the disclosure \vould be
understood more easily with refeience to the following descriptions in regard to the
embodiments of the disclosure combined ~vith tlie appended drawings. The
components in the appended drawings are not plotted in proportion, but aim only to
sl~owth e principle of the disclosure. In the appended drawings, identical or sinlilar
teclu~ical features or components will be denoted by using identical or sinlilar
reference signs.
[I61 FIG. 1 is a schematic flow view illustrating a communication method in a
wireless communication systcnl according to one eniboditilent of the disclosure;
[17] FIG. 2 is a schematic flow \iew illustrating a detailed example of a
comtnunication method of dynaniically selecting configuration of an enhanced
Physical Downlitlk Control Channel (ePDCCH) adapted to current systetil
configuration;
1181 FIG. 3 is a schematic flow view illustrating a communication method in a . -
\\ireless commu~~icatiosyns tem according to one embodiment of the disclosure;
[19] FIG. 4 is a schcniatic flow view illustrating a detailed examl)le of receiving eCCE
configuration infornlation by a ternlinal node;
[20] FIG. 5 is a schematic vic\v illustrating an exatnple of a resource occupying case
of one physical resource block pair in one systetn configuration;
[21] FIG. 6 is a schetiiatic flow view illustrating a communication method according
to another etnboditnent of the disclosure;
[22] FIGS. 7(A)-(D) are views illustrating a detailed exanlple of an eCCE nlapping
tiiatluer;
[23] FIG. 8 is a schematic block diagrani illustrating a structure of a comnlunication
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Our Ref.: OP1413-06-0101
device in a radio systetn according to one embodiment; and
[24] FIG. 9 is a schematic block diagram illustrating a structure of a colnmunication
device in a radio systc~na ccording to another embodiment;
DETAILED DESCRIPTION OF THE EMBODIMENTS
[25] Hereinafter, embodiments of the disclosure wvill be described with reference to
the appended drawings. Eletiients and features described in one figure or one
embodiment of the disclosure may be combined with those shown in one or more
otlier figures or embodiments. It should be noted that, for tlic purpose of clarity,
representations and descriptions of conlponents and processing known to a person
skilled in the art which are not related to the disclosure are otnitted in the appended
dra\vings and descriptions thereof.
[26] Some embodilncnts of tlie disclosure provide a communication method and
device in a wireless colmi~utiication systetn, as \?cell as a communication system
adopting such a method or usi~igs uch a device, wherein a configuration scheme of an
Enhanced Physical Downlink Control Channel as adopted (for exa~iiplei ncluding a
size of an Enhanced Control Channel Element andlor a nlnltiplexing manner of an
Enhanced Control Channel Element in a resource block andlor a mapping
demodulation scheme of vacant Resource Elements (REs), etc.) can effect efficient
utilization of downlitlk resources, improve transmission perfor~natice and enable
excellent compatibility with a PDCCH in R10.
[27] FIG. 1 is a schetiiatic flow view illustrating a comniunication method in a
wireless co~~un~unicatsioysnt em according to one elnbodi~nento f the disclosuse. The
tnethod as illustrated in FIG. 1 is carried out at a base station side of the
communication system.
[28] As slio\v~i n FIG. I, the method coniprises Steps 102 and 104.
[29] In Step 102, a classification of config~~ratioonf enhanced Control Channel
Elements (eCCEs) it1 an ePDCCH is determined by a base station in the
cotntllunication system according to a current system configuration of the
cotnmunication system.
(301 One ePDCCII may carry one or more cCCEs. A size of the eCCE, i.c. the number
of Resource Elctncnts (REs) in tlie eCCE, directly i~lfluences a setting of a search
space, a link level perforniance and a capacity ol' the eI'DCCM, etc. Therefore, thc
size of the eCCE is one of i~nportantin dices of the configuration of the ePDCCH. 111
the present embodiment, the eCCE configuration in tlie ePDCCH map colnprise a size
of each eCCE (i.e. the number of resource elenients in each eCCE), tlie nunlber of
eCCEs in each Physical Resource Block pair (PRB pair), etc.
[3 11 In tlie present embodiment, the eCCE configuration in the cPDCCII is classified
into a plurality of classifications which respectively correspond to different system
configurations of the comm~~nicatiosny stem. In other words, the plurality of system
configurations of the co~n~ntunicationsy stem may be divided into a plurality of
classifications, and correspondingly, the eCCE configurations in tlie ePDCCH of
different classifications correspo~iding thcrcto map be defined, that is, each system
configuration may correspond to an eCCE configuration of a corresponding
Sony China Ref.: CNPA120241N00
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classification. In this wa): the base station can dynamically select an eCCE
configuration of a corresponditlg classificatioti according to current system
configuration of the coni~llunicatiolls ystem.
[32] Then, in Step 104, the base station notifies a terminal node in tlie communication
system of an information on the dcternlined classification of tlic configuration of
enl~aacedc ontrol channel elements.
[33] It is noted that, in the disclosure, the terminal node refers to a user node UE, such
as a mobile terminal and so on, in the communication system.
[34] The base station may transmit the information on tlie determined classification of
tlie configuration of enhanced col~trolc hannel elements in any proper manner. As an
example, extension of an existing Physical Downlink Control Cliatluel signaling (e.g.
a legacy PDCCH signaling in RlO (an existing PDCCH signaling)) tniay be adopted to
translllit the iiifor~l~ationth, at is, the infornnation is packaged into extended Physical
Downlitlk Control Cha~luel signaling and transmitted to the terniinal node. This
manner may enable excellent conlpatibility with the original R10 version, and utilize
original control resources. As anotlier example, an enhanced Physical Downlink
Control Chatlnel signaling (an ePDCCH signaling) niay also be defined, that is, the
infor~nation is packaged into a ne\\dy defined Physical Do\vnlink Control Cha~uiel
signaling and transniitted to the terniinal node. This lnanller is sitnple and feasible,
requires only an addition of a 11e\\~s ignaling, and can be effectcd upon occupation of
some vacant resources. As still as anotlier example, an enhanced Pl~ysical Control
Forniat Itldicatio~Cl hannel signaling (ePCFICH signaling) may be defined, that is, the
infor~liationis packaged in a newly defined ePCFICH signaling and transmitted to the
tertniinal node. This niantler can better distinguish the ePDCCI3 fiom the previous
PDCCH, avoiding confitsion in use. It should be understood that the ePDCCH
signaling and tlie ePCFICH signaling may be defined in any proper fornlat, \vI~ich is
not linlited to any specific format by the disclosure and will not be described in detail
herein either,
[35] In the above com~ilunicationm ethod, the eCCE cotlfiguration in the ePDCCH is
classified into a plurality of classificatiolls \vl~ich respectively correspond to different
systeili cotifigurations of the communication system, and the base station can select a
corrcsponding eCCE confignration accortling to currcnt system cot~figitratioti of the
cotntnut~ications pstcm. In this it is matle possible to rcduce resource waste (that
is, to reduce the autnber of "\racant REs"), and also it is niadc possible to improve
adaptive perfomlance of a link of the ePDCC1-I and to reduce possible signaling
transtliissio~ei xpenses.
[36] As an example, the system configuration of the communication system may
comprise infornlation such as number of Optical Frequency Division Multiple Access
(OFDMA) symbols borne by the physical downlink control cliannel, number of
reference signal ports and so on. Both the number of OFDMA symbols borne by the
PDCCH and the nlunlber of reference signal ports will influe~lce number of usable
REs of tlie ePDCCH. Therefore, the classification of the configuration of tlie
enhanced control chainnel eletllents may be deternlined according to the above
configuration infornlation. As a detailed example, in Step 102, the base station liiay
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
deternline the classification of the configuration of enhanced control channel elements
accoding to number of resource elements usable to carry the enlianced pl~ysical
downlink control channel in one physical resotlrce block pair (or according to n~utnber
of resource eletrtents usable to carry the enhanced physical dowvnlink control channel
in onc pl~ysicalr esource block pair and number of reference signal ports).
[37] FIG. 5 illustrates an occupying case of orle PRB pair in one system configuration,
wherein one block represents one RE. A PDCCH occupies two OFDM symbols, a
Common Reference Signal CRS uses four ports, a De~nodulation Reference Signal
DMRS uses four ports, and the remaining vacant REs are usable for carrying eCCEs.
[38] Table 1 sho\vs exanlples of numbers of usable REs in one PRB pair in the
following different systeln configuration: the Demodulation Reference Signal DMRS
is set to use four ports, and the PDCCH occ~rpies different nunlbers of OFDM
symbols and the CRS uses differeut nunlbers of ports.
Table 1
following different spste~nco nfigurations: the Demodulation Reference Signal DMRS
is set to use two ports, the PDCCI-I occupies different nutnbers of OFDM sy~nbolas nd
the CRS uses different numbers of ports.
REIPRB pair
-
may be classified into 4 corresponding classifications according to the nunlber of
OFDM synlbols borne by the PDCCI-I and the number of reference sign ports. In this
case, after deternlining a classification of the eCCE configuration corresponding to
current system configuration, the base station may package inforn~ation on the
classification into a signaling of 2 bits (hereinafter referred to as a first signaling), and
trans~nit the first signaling to the terminal node. Herein, as stated above, the first
signaling may be an extension of an existing pliysical do\vnlink co~ltrol cllannel
signaling, 01. may be a newly defined ePDCCH signaling or ePCFICH signaling,
which \\rill not be described in detail herein.
[41] Hereinafter, a detailed exanlple of detern~iningth e eCCE configuration accordi~lg
[39] Table 2 sho\vs examples of nunlbers of usable REs in one PRB pair in the
-
Ntttnber of OFDMs Carried by PDCCH
Number of
Ports of
Co~n~notl
Reference
Signal
Table 2
0
144
136
128
120
0
1
2
4
REIPRB pair
1
132
126
120
112
[40] As a detailed exanlple, the configuration of enhanced control channel elements
Number of OFDMs Carried by PDCCII
Nuinber of
Ports of
Common
Reference
Signal
0
152
144
136
128
0
1
2
4
2
120
114
108
104
3
108
102
96
92
1
148
134
128
120
2
128
122
116
112
3
116
110
104
100
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Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0201
to the system configuration as shown in Table 1 will be described. Specifically, the
eCCE configuration in the ePDCC1-I may be classified into the following 4
classifications according to number of resource elements usable to carry enhanced
pl~ysicald ownlink co~~trcohla nnel:
Classification 1: when the number of resource elenlents usable to carry
enhanced physical downlink control channel is between 144-128, each eCCE may
comprise 32 REs, and each 1111ysical resource block pair may carry 4 eCCEs;
Classificatio1l2: when the number of resource elen~entsu sable to carry enhanced
physical downlink control channel is betwcen 126-120, each eCCE may comprise 30
REs, and each physical resource block pair may carry 4 eCCEs;
Classification 3: when the number of resource elements usable to carry e~lhanced
physical downlink co~ltrocl hannel is between 114-108, each eCCE may comprise 36
REs, and each physical resource block pair may carry 3 eCCEs;
Classification 4: when the number of resource elements usable to carry enhanced
physical do\vnlink control channel is between 104-92, each eCCE may comprise 30
REs, and each physical resource block pair may carry 3 eCCEs.
[42] Hereinafter, another detailed example of deter~nining the eCCE configuration
according to the systenl configuration as shown in Table 2 will be described.
Specifically, the eCCE configuratiorl in the ePDCCH may be classified into the
following 4 classifications according to number of resource elements usable to carry
enhanced physical downlink control channel:
Classification 5: when the nunlber of resource elements usable to carry enhanced
physical downli~kc ontrol channel is between 136-152, each eCCE may comprise 34
REs, and each pl~ysicarle source block pair may carry 4 eCCEs;
Classification 6: when the n-t~mbero f resource elements usable to carry enhanced
physical downlink control chatu~eli s between 128-134, each eCCE may comprise 32
REs, and each physical resource block pair may carry 4 eCCEs;
Classification 7: when the number of resource elements usable to carny enhanced
pl~ysicald ownlink colltrol channel is between 116-122, each eCCE may co~nprise3 8
IEs, and each physical resource block pair may carry 3 eCCEs;
Classification 8: wheu the nnulber of resource elements usable to carry enhanccd
1111ysical tlo\vnli~kc ontrol channel is between 100-112, each eCCE may co~nprise3 3
REs, and each physical resource block pair may carry 3 eCCEs.
[43] Tables 3 and 4 show determining relationships of the number of the usable REs
with respect to the size of the eCCEs and the nu~nber of the eCCEs in the above 4
classifications of configurations of the eCCEs according to the system configurations
as shown in Table 1 and Table 2, respectively.
Table 3
Number of
Usable REs
Size of cCCEs
&Number of
1 eCCEs in One
128-144
(classification
1)
32REleCCE;
4 eCCEs
120-126
(Classification
2)
30REleCCE;
4 eCCEs
108-114
(Classification
3)
36REleCCE;
3 eCCEs
92-104
(Classification
4)
30REleCCE;
3 eCCEs
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Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
PRB Pair
Table 3
configuration of the Classification 1 would be selected in Step 202-2; otherwise,
processing would proceed to Step 202-3. In Step 202-3, it is judged whether the
number of resource elements usable to carry enhanced physical dow~~lincko ntrol
channel is between 126 and 120, wherein if yes, the eCCE configuration of the
I Number of I 136-152
Usable REs
Size of eCCEs
& Number of
eCCEs iu One
PRB Pair
Classification 2 would be selected in Step 202-4; othenvise, processing would
proceed to Step 202-5. In Step 202-5, it is judged \vhether the nnumber of resource
ele~nentsu sable to carry enhanced pl~ysicald o\vnlink co~~trcohla nnel is between 144
and 108, wherein if yes, the eCCE configuratio~l of the Classification 3 would be
selected in Step 202-6; otl~erwise, the eCCE configuration of the Classification 4
\vould be selected in Step 202-7. Then, in Step 204-1, infommation on the selected
classification of the eCCE configuration is packaged into a signaling of 2 bits (as a
detailed exatnple, in the signaling, "00" may represent the Classification 1, "01" lnay
represent the Classification 2, "10" may represent the Classification 3, "11" may
represent the Classification 4, etc., w11ich will not be described in detail herein), and
in Step 204-2, the signaling is transmitted to the ter~ninanl ode.
[45] A size of a Control Channel Element (CCE) in the PDCCH is 36 (that is, in the
PDCCH, one CCE conlprises 36 REs), so in view of compatibility with the PDCCH,
in the ePDCCH, nutnbcr of REs in one eCCE tnay be nmade to change between 30 and
38 (for example 30, 32, 36 or 38). In this way, it is nladc possible to cnsurc that an
atnou~lt of Dow~llink Control lnforlnatioll (DCI) borne in each eCCE is neither too
small nor too large. I11 the above detailed example, the eCCE configuration is
classified into 4 classifications, and by adopting this tnethod, a waste rate of downlink
128-134
[44] FIG. 2 illustrates a detailed exanlple of a comn~unicationm ethod of dynamically
selecting an ePDCCH configuration adapted to current system configuration by using
the eCCE configurations of the 4 classifications as shown in Table 3. In Step 202-1, it
is judged whether the nunlbcr of resource elenlents usable to carry enhanced physical
downlink control channel is between 144 and 128, wherein if yes, the eCCE
(classification
5)
34REleCCE;
4 eCCEs
resources is made relatively low (through calculation, the waste rate in this case is
about 4%, \vlmile the waste rate is about 10% when the eCCE configuration is
classified into two classifications). On the other hand, altltough lnore number of
classifications leads to a lower ~vastera te of resources, a gain of a utilization rate of
the resources becomes lower as the number of classifications increases, so in the case
of too large number of classifications of the eCCE configuration, the adaptive process
of the link of tl~ce PDCCI-I through eCCE aggregation would beco~nec omplicated,
and when the base station needs to notify the terlninal node of an information on
116-122
(Classification
6)
32REfeCCE;
4 eCCEs
100-112
(Classification
7)
38REleCCE;
3 eCCEs
(Classification
8)
33REleCCE;
3 eCCEs
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Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
curreut eCCE configuration, signaling expenses needed will increase as tlie ~~u~ilobfe r
classifications of the configuration of the eCCE increases. In the above embodiment,
since 4 classifications of the configuratioti of the eCCEs are adopted, the first
signaling only needs 2 bits. Therefore, by adopting the communication method as
sho\vn in FIG. 3, it is made possible to get excellent balance between the waste rate of
resources and the signali~lge xpenses.
[46] As a detailed enlbodiment, correspondences between different spste~n
configurations and classifications of the eCCE configuration the may be pre-stored in
the base station (for exatnple, stored in a memory device of the base station). Upon
obtaintnent of current system configuration, the base station may determine
corresponding eCCE configurations according to tlie stored correspondences, and
trans~nit infortnation on the classifications of the configt~ration to the terminal node.
Various types of infornlation on the eCCE configuration may be pre-stored in the
terminal node (for exa~nple,s tored in a t~~eniordyev ice of the tenninal node). Upon
obtai~unento f inforniation on tl~ec lassification of tlte cCCE configuration &om the
base station, the terminal node majl query information corresponding to the
classification accordi~igto the classificatio11.
[47] FIG. 3 is a schematic flow view illustrating a communication mnethod of receiving
inforn~ationo n the configuration of enhanced control channel elements at a terminal
node side \vhich corresponds to the method as shown in FIG. 1. As sl~o\vni n FIG. 3,
the method may cotnprise Steps 302 and 304.
[48] In Step 302, the terniinal node receives inforn~atioro~n the classification of the
configuration of the enhanced control cl~anueel le~nentsfr om tlie base station.
[49] Si~nilarlyto the embodiment described above, the config~~ratioonf the enhanced
control cha~uleel lements mentioned herein comprises number of resource ele~nentsin
each enhanced control channel element and number of enhanced control channel
elements in each pl~ysical resource block pair, and the like. In addition, the
configuration of the e~lhancedc ontrol cl~annelc le~nentsis classified into a plurality of
classifications which respectively correspond to different system configurations of the
com~nunications ystem. Detailed dcscription will not be made herein.
[50] In Step 304, the terininal node performs demodulation for the e~ilia~lcecdo ntrol
channel elements according to the classification of the configuration of the enhanced
control channel elements. Specifically, up011 obtainment of the infonnation 011 thc
classification of the eCCE configuration from tlie base station, tlie ter~ninanl ode niay
query configuration infortnation corresponding to the classification, in infonnation on
a plurality of pre-stored configurations of the eCCEs, according to the classification,
and perfom de~i~odulatiofonr the eCCEs according to the configuration inforti~ation.
[51] As a detailed exa~i~plcth, e eCCE configuration may be classified into 4
classifications, for example, the 4 classifications as sl~o\\~in the above Table 3 or
Table 4. In this way, the base station may transmit, by means of a signaling of 2 bits
(for example a first signaling), infom~ation for indicating the classification of the
cCCE configuration wllich corrcsponds to current syste~nc onfiguration (as sl~o\\nin
Steps 204-1 and 204-2 in FIG. 2). Correspondingly, in Stcp 302, the ternlinal code
niay obtain the relatcd information by receiving a signaling (for example a first
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
signaling) of 2 bits in wliich thc information on the classification of the configuration
of enhanced control channel elements is packaged).
[52] As an cxanlple, the terniinal node may obtain the infor~nation on the
classification of the eCCE configuration by lileans of a Physical control fonnat
indication channel (PCFICH). This tnetliod can excellently inherit signaling
characteristics in the original R10 \rcrsion and has excellent conlpatibility therewith,
without needing to newly add any other signaling information; on the other hand,
calculation of the tcr~ninali s not complicated at all. The PCFICH refcrs to a physical
format indication channel dedicated for indicating number of OFDM symbols
occupied by a PDCCH. The PCFICI-I is placed in a first OFDM symbol of each
sub-frame, has a size of 2 bits, and actually delimits a control signaling region and a
data region in each sub-fra~iieF. IG. 4 illustrates a detailed exanlple of receiving eCCE
configuration infornlatioa by using the PCFICH. As shown in FIG. 4, in Step 402-1,
the temiinal node receives the physical control format indication chatu~cli ~iforn~ation.
Specifically, the tertninal node obtains number of OFDM symbols occupied by
PDCCH transmission in current system configuration by demodulating the PCFICI-I
infor~nation. Then, in Step 402-2, number of resource elelnents usable to carry the
enl~ancedp hysical downlink control cha~uleli s received based on the infortnation on
physical control format indication channel. Spccificall~t~h,e terminal node may obtain
CPRS port number from system information by using the PCFICH infor~i~atioann, d
then number of REs currently usable to carry ePDCCHs is calculated. In Step 402-3,
the ter~ninal node obtains the classification of the configuration of enhanced control
cha~uiele lelncnts by querying a pre-stored table containing configurations of eCCEs
(for example the infor~nationa s shown in FIG. 2).
[53] In the foregoing, a conununication tnethod in a wireless con~munications ystem
is described, \vl~erein corresponding classifications of the eCCE configuration are
dcter~liined according to different system configurations, and information such as
corresponding sizes of eCCEs and so on is defined in various classifications of the
eCCE configuration. FIG. 6 illustrates a co~nmunicationin etliod according to another
embodiment of the disclosure, \\rlierein the base station fi~rtlierd etermines a mapping
nlatuler of enhanced control cha~uiccl lcmcnts in a physical resource block pair.
[54] specific all^: as sho\vn in FIG. 6, in Step 606, the base station determines a
tnapping manner of enhanced control cliannel elcments in a physical resource block
p i e In the determined mapping manner, a plurality of enhanced cl~a~uleclo ntrol
ele~nentso f each physical resourcc block pair tnay be mapped into the plurality of
resourcc ele~ilentsin a diagonally arranged pattern. The so-called diagonally arranged
pattern refers to that, in each PRB pail; the same eCCE is diagonally arranged to be
mapped into usable REs in a contigous and localized manner. 111 this a mal~ping
rule during actual operation is silnplified, that is, an actual mapping algoritlul~is made
achievable more easily. In addition, tl~ca bove diagonally arrangcd mapping pattern is
actually to nlultiplex a plurality of eCCEs to one PRB pair by using a combined
multiplxing method of time division multiplexing. and frequency division
multiplexing, wherein using the manner of time division multiplexing can reduce
eticoditig time delay, using the manner of frequency division inultiplexing can realize
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
polver balance, and using the manner of combination of the two has both the above
advantages of the time division multil~lesinga nd the fi.equency division multiplesing.
[55] FIGS. 7(A)-(D) are scliematic views illustrating nlapping eCCEs in a diagonally
arranged pattern in different classifications of the eCCE configuration respectively,
wherein FIG. 7(A) illustrates an exanlple of napping when adopting the Classification
1 of the eCCE configuration; FIG. 7(C) illustrates an esample of mapping when
adopting the Classification 3 of the eCCE configuration; and FIG. 7(D) illustrates an
exanlple of mapping when adopting the Classificatio~l4 of the eCCE configuration.
Then, in Step 608, the base station notifies the terminal node of an information on the
mapping nlallner It should be noted that the Step 608 is optional. In general cases, the
base station does not need to transmit infornlation on the mapping manner to the
tenninal node, as long as the base station and the ternlinal node have appointed in
advance mapping manners used in various classifications of the eCCE configuration.
Upon obtaiiunent of inforn~ationo n the classification of the eCCE configuration frotom
the base station, the terminal node can pcrforn~d emodulation according to a napping
manner corresponding to the classification which has been appointed in advance.
[56] As a detailed esatnple, in a case where a phlurality of enhanced channel control
elcnlents of each physical resource block pair is mappcd into the plurality of resource
ele~nents in a diagonally arranged pattern, the terrninal node nlay contiguously
demodulate a plurality of resource ele~nentsin the physical resource block pair in a
diagonally arranged pattern to obtain the respective enhanced channel control
elements.
[57] As an example, unoccupied resource elements in the physical resource block pair
may be mapped in a uniformly distributed pattern, following each enhanced control
clianllel eleme~itI. n this case, the ternlinal node vacates and does not demodulate the
unoccupied resource elelnents after perfornling the demodulation for each enhanccd
control channel ele~nent.
[58] Hereinafter, a detailed esanlple of mapping and den~odulation for vacant REs
will be described.
[59] Firstly, a tcr~ninalo f the base station obtains current system configuration, and
calculates number N of IEs usable for trans~nissiono f ePDCCHs according to current
system configuratioti. Assu~ning that in a classification of the eCCE confignration
corresponding to current system configuration a si7e of each eCCE is 11 and nunlber of
eCCEs borne in each PRB pair is x, the base station may calculate number Y of REs
needed to be vacated after obtaining each eCCE mapping according to the follo\ving
equation (1):
[60] In the above equatioll, synlbol " I" represents rounding do\\~nwards,w herein if
esact division can be performed, number of vacant REs follo\ving each eCCE is equal;
other\vise, the last surplus RE(s) would be mapped following the last one cCCE.
[61] Then, the base station vacates Y REs according to the calculated ilumerical value
of Y each time ePDCCH information on 11 REs is mapped. Generally, the basc station
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Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
and the tertninal node may appoint in advance information on a niapping n1atines.
Optionally, the base station may transmit the information on the nlappitlg manner to
the terminal node.
[62] Correspondingly, at tlie ter~ninaln ode, the terminal node acquires configuration
inforniation on eCCEs in current systetn configuration (for example by using the
method described above, which will not be repeated described herein). Specifically, a
size 11 of each eCCE and number x of eCCEs borne in each pair of PRBs are acquired.
1631 Then, the terminal node acquires number Y of REs needed to be vacated after
denlodulation for each eCCE. As an example, Y niay be notified to the ternlinal node
by the base station by means of a signaling. As another example, the terminal node
may calculate Y by using the following equation (2).
[64] The ternlinal node may obtain current systetii configuration by demodulating a
system signaling artd original control cl~annel infornlation, artd obtain numbcr N or
REs usable for transtnissiotl of ePDCCHs according to current systenl configuration
(for exaniple Table 1).
1651 Thereaftel; the tern~inaln ode calculates nuniber Y of REs needed to be vacated
after de~nodulationf or each eCCE according to the following equation (2):
1661 According to the calculated value of Y, the tenninal node vacates and does not
detnodnlate Y REs each time ePDCCH information on 11 REs is demodulated.
1671 As another example, unoccupied resource elenlents in tlic pliysical resource block
pair nlay be mapped in a unifortllly distributed pattern, preceding each e~hanced
control channel element. In this case, the tenninal node skips the unoccupied resource
elements after performing the demodulation for each enhanced control channel
clement. Specific steps are similar to those described in the above exatllple, and will
not be repeatedly described lierein.
[68] As a detailed example, the base station niay also transmit a signaling (for
example a first signaling) containing information for indicating a classification of the
eCCE configuration whicli cosresponds to current syste~nc onfiguration, by using the
unoccnpietl resource elements (vacant REs) of the e~lhanced physical dowr~link
control channel, to the tcnninal node. For cxarnple, in tlie above exatnple, tioc occupied
resource elenients in the physical resource block pair may be mapped in a unifortuly
distributed pattern, preceding each enhanced control chatme1 elenlent, and in this case
the first signaling may be borne by using vacant REs located preceding eCCEs. The
terminal node first demodulates the first signaling, and then demodulates eCCEs. Or,
the first signaling nlap be placed in other vacant REs, and the ternlinal tiode receives
infostnation on a mapping pattern transmitted by tlie base station (or infornlation on a
mapping pattern which is appointed in advance by the ternlinal node and the base
station), first perforn~s demodulation according to the inforillation to obtain the first
signaling, and then denlodulates eCCEs. Carrying the signaling containing
infornlation for indicating a classification of the eCCE configuration ~vliicl~
corresponds to current system configuration by using vacant REs does not need to
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
occupy new resources, making it possible to better utilize resources that would have
been possibly wasted.
[69] As a detailed embodiment, in the solution where a plurality of enhanced cha~luel
control elelllents of each physical resource block pair is mapped into the plurality of
resource elements in a diagonally arranged pattern, the enhanced physical do\vnlink
control channel may be mapped into one physical resource block pair in a localized
manner, or may be mapped into a plurality of physical resource block pairs in a
distributed manner. Correspondingly, in the localized maonel; the terminal node may
perform demodulation for enhanced control channel elements in one physical resource
block pair in a localized manner to obtain an e~lhanced physical do\vnlink control
channel; and in the distributed nlannel; the terminal node may perfor111 demodulation
for enhanced control chatmel elements in a plurality of physical resource block pairs
to obtain an enhanced physical downlink control channel.
[70] Hereinaftel; a communication device in a wireless communication system
according to some enlbodiments will be described.
[71] FIG. 8 is a schematic block diagram illustrating a structure of a communication
device in a radio communication system according to one embodin~ent. The
com~l~unicatiodnev ice 800 may be configured in a base station in the conlmunication
system.
[72] As shown in FIG. 8, the communication device 800 may comprise a
configuration classification deternlining device 801 and a transmitting device 803.
[73] The communication device 800 may adopt the method described above with
reference to FIGS. 1-7. For example, the configuration classification determining
device 801 may determine a classification of configuration of enhanced control
channel eletllents in an enhanced physical downlink control channel according to
current system configuration of a collln~unications ystem.
[74] As stated above, the configuration of enhanced control channel elements may
conlprise il~unbero f resource eletnents in each enhanced control cha~meel lement and
number of enhanced control channel elements in each physical resource block pair
and the like, and the configuration of enhanced control channel elements is classified
into a plurality of classifications \vhich respectively cowcspond to different systetll
configurations of the comtnunication system and the like. As detailed examples, the
system configuration may comprise number of OFDMA symbols borne by the
physical downlink control channel and number of reference signal ports. The
configuration classification deter~llining device 801 may dcternline the classification
of the configuration of enhanced control channel elements according to number of
resource elenlents usable to carry the enl~anccdp l~ysicald o\vnlink control channel in
one physical resourcc block pail:
[75] As a detailed exanlple, the configuration of enhanced control channel elenlents
may be classified into 4 classifications corresl)onding to different syste~il
configurations of the communication system, for example, the 4 classifications as
sho\vn in the reference Table 3 or Table 4, \vIiich \viIl not be repeatedly dcscribed
herein.
[76] The transnlitting device 803 is used for notifying a ternlinal node in the
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
co~ilrnunications ystem of an information on tlie classification of the configuration of
enhanced control channel elc~uentsd eterniined by the determining device 801. As a
detailed example, for exatnple, if the configuration of enhanced control channel
elements may be classified into 4 classifications corresponding to different system
co~lfigltrations of the communication system, the transmitting device 803 Itlay
package the infor~iiation on the detertilined classification of tlie configuration of
enhanced control channel elements into a signaling (for example a first signaling)
havi~lg2 bits, and transmit the first signaling to the terlilinal node. As stated above,
the first signaling may be an extension of an existing PDCCH signaling, and may also
use an ePDCCH signaling or an ePCFICH signaling. For example, tlie first signaling
may perform transriiission by using vacant REs of ePDCCHs, wliich will not be
repeatedly described herein.
[77] Optionally, tlie device 800 may further include a ~ilappingn latitler deternlining
device 805. The mapping manner detcr~uiningd evice 805 may determine a mapping
niantrer of c~lhanced control channel elements in a physical resource block pair by
using the niethod described above with reference to FIGS. 6-7. For example, the
plurality of enhanced chalulcl control elements of the physical resource block pair
may be mapped into tlie plurality of resource elelilents in a diagonally a~xinged
pattern (as shown in FIG. 7); and also for exatnple, unoccupied resource eleli~entsi n
tlie physical resource block pair are mapped in a unifor~nly distributed pattern,
following eacli e~lhanced control cliannel element, which will not be repeatedly
described herein.
1781 The transmitting device 803 may transtnit information on the mapping lilanner to
the tcr~ilinaln ode. The transmitting device 803 tnay trans~ilitt he inforniatio~ii n any
proper malulel; v~l~iwchil l not be described in detail herein.
1791 FIG. 9 illustrates a structure of a cornmunication device in a radio co~limunication
systetli according to one embodinlent. The communication device 900 is configured in
a terminal node in the commu~iicationsy stem.
1801 As showvn in FIG. 9, the com~nunicationd evice 900 comprises a receiving device
901 and a processing device 903.
[81] For example, tlie communication device 900 may adopt the method described
above with reference to FIGS. 1-7. Specifically, the receiving device 901 tilay receive
information on classification of configuration of enliancetl control channel elements
transmitted fi.0111 a base station in tlie com~~iunicatiosny ste~ii.A s stated above, tlic
configuration of e~lhanced control channel elements may comprise nutllber of
resource elements in eacli e~diancedc ontrol channel element and mnmber of e~hanced
control channel elements it1 eacli pl~ysical resource block pair and the like, and the
collfiguration of enhanced control clia~nicl elements is classified into a plt~rality of
classifications which respectively correspond to different system configurations of the
communication system, wliich will not be repeatedly described herein.
1821 The processing device 903 may be used for perforuling demodulation for the
e~lha~lcecdon trol channel elements according to tlie classificatio~ol f the configuration
of enhanced control cl~am~eell e~nents. specific all^: upon obtailulient of the
infornlation on the classification of tlie eCCE configuration fro111 the base station, the
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
processing device 903 may query configuration infornlation corresponding to the
classification, in inforlnation on a plurality of pre-stored configurations of the eCCEs,
according to the classification, and perfortxi delnodulation for the eCCEs according to
the configuration infonilation.
[83] As a detailed example, the configuration of control channel eletnents may bc
classified into 4 classificatiot~s( for exatnple, as show~ilt1 the above Table 3 or Table 4,
~vl~ethne DMRS uses four ports, the configuration is classified into Classifications
1-4; or when tlie DMRS uses two ports, the configuration is classified into
Classificatiotls 5-8). In this case, if i~iformationf or indicating tlie classification of the
configuration of enhanced control channel eletilents is packaged by the base station
into a signaling (a first signaling) of 2 bits, the receiving device 901 tilay receive the
first signaling, and parses the first signaling by the proccssitlg device 903, thereby
obtaining information for indicating tlie classification of the config~uation of
enhanced control channel elelnents, thereby pcrfortning detnodulation for enhanced
control channel eletnents.
[84] As an example, the terminal node may obtain infortnation on the classification of
the eCCE configuration by a Physical control format indication channel (PCFICH).
The receiving device 901 may receive information on physical control format
indication channel. Tlie processing device 903 may calculate tltitnber of resource
elc~ilcntsu sable to carry the c~lhancedp hysical downlink control channel based on the
information on physical control fornlat indication channel, and obtain the
classification of tlie configuration of enhanced control channel elements by querying a
pre-stored table containing configurations of enhanced control channel eletnetits.
[85] As a detailed embodiment, the receiving device 901 may fi~rther receive
infornlation on a mapping manner of enhanced control channel elements in a physical
resource block pair fiotn the base station.
[86] As a detailed example, in a casc mrllere a plurality of enhanced channel control
elements of each pliysical resource block pair is mapped into the plurality of resource
elements in a diagonally arranged pattern, the processing device 903 may
contiguously demodulate a plurality of resource elements in tlie pliysical resource
block pair in a diagonally arrangcd pattern to obtain the lespective enhanced channel
control eletnetits.
[87] As an example, unoccupied resottrce elcments in the physical resource block pair
1ilajr be mapped in a uniforinly distributed pattern, follo\virig each enhanced control
channel element. In this casc, the processing device 903 vacates and does not
demodulate the unocct~pied resource elements after performing the detilodulation for
each enlianced control channel element. As another exatnple, tuloccupied resource
eletnents in the pliysical resource block pair may be tilapped in a uniformly
distributed pattern, preceding each enhanced control channel elenlent. I11 this case, thc
processing device 903 skips the unoccupied resource elements after performing the
demodulation for each enhanced control channel element.
[88] As a detailed embodiment, the enhanced pliysical downlink control channel may
be mapped into one physical resource block pair in a localized manner, or may be
mapped into a plurality of pl~ysical resource block pairs in a distributed maruier.
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
Correspondingly, in the localized manner, the processing device 903 may perform
den~odulation for enhanced control channel elcnlents in one physical rcsource block
pair in a localized manner to obtain an enhanced physical dowvnlink control channel;
and in the distributed matnler, the processing device 903 may perfonn dc~nodulation
for e~hanced control channel elements in a plurality of physical rcsource block pairs
to obtain an enhanced physical downlink control cha~nlel.
[89] According to one embodiment, a wireless comn~unication system is further
provided. The system co~llprises a base station and a ternlinal node, and the base
station comprises a conlnlunication device (for exanlple 800) configured at a base
station side as described above, and the terntinal node comnprises a communication
device (for example 900) configured at a tenninal node side as described above.
[90] It should be understood that the above emnbodiments and exanlples are illustrative
but not enunlcrative. The disclosure shall not be regarded as being limited to any
detailed enlbodiment or exan~ple. In addition, in the above embodiments and
examples, steps or a method or nlodules of a device are represented by reference
~lumnerals. As should be understood by a person skilled in the art, these reference
numnerals aim onlj. to distinguish these steps or modules in terms of wording, but do
not represent an order thereof or any other definition.
[91] As an exanlplc, the respective steps of the above method and the respective
cotnposite modules atldlor devices of the above device may be carried out as software,
firn~~varhea, rdware or conlbinations thereof. The respective conlposite components,
clenlents and sub-elements in the abovc device may be configured by tneans of
software, hardware or combinations thereof. The specific tneans or manners for the
configuration are well-known to a person skilled in the art, and will not be repeatedly
described herein.
[92] The disclosure further proposes a program prodnct. When the instruction code is
read and executed by a ~nacliine,t he abovc communication metl~oda ccording to the
embodiment of the disclosure may be executed.
1931 Correspondingly, a storage medium for carrying the program product storing
machine-readable instruction code is also included in the disclosure. The storage
medium includes but is not linlited to a soft disk, a hard disk, a magnetooptical disk, a
storage card, a storage rod, etc.
[94] 111 the abovc descriptions of the detailed einbodituents o f the disclosure, features
described andlor shown for one embodiment may be used in an identical or similar
nlanner in one or more other embodiments, be cotnbincd with features in other
enlbodimeats, or replace features in other cmbodiments.
[95] It should be emphasized that: the tern1 "conlprise/include" used in the disclosure
refers to existence of features, elements, steps or assemblies, without excluding
existence or addition of one or nlore other features, elements, steps or assemblies.
[96] 111 addition, the method according to the disclosure is not linlitcd to be carried out
according to the tc~llporal order described in the Description, but may also be carried
put according to other tcnlporal orders, in parallel or independently. Therefore, the
order of carrying out the method described in the Description fails to constitute a
linlitation to the scope of the technique of thc disclosure.
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
[97] Although tlie disc1osu1.e has been described above by describing tlie detailed
c~ilbodimetltso f tlie disclosure, it should be urtderstood that a person skilled in the art
cat1 carry out various modifications, improvements or cqui\ralents for the disclosure
within the spirit and scope of the appended clai~ns. These modifications,
itnprovements or equivalents shall also be regarded as being included within the scope
of protection of tlie disclosure.

WE CLAIM:-

1. A cotntnutiication tnetllod for use in a wireless coti~tnu~iicationsy stem,
comprising:
detesnlitiing, by a base station in the coi~u~~unicatsiyosnte m, a classification of a
configuration of enhanced control channel elements it1 an enhanced physical do\vnlitik
control cha~nlel according to a current systetil configuration of the communication
system, wherein the configuration of enlianced control cliannel eletiients comprises
the nnuiber of resource elements in each enhanced control channel element and the
nunlber of enlianced control channel eletilents in each physical resource block pair,
and \\~I~escittlii e configuration of enl~aticedc ontrol channel elements is classified into
a plurality of classifications whicli respectively correspond to different system
configurations of the communication system; and
noti6ing a terminal node in tlie co~inllunication system of infomiation on the
deter~nined classification of the configt~ration of the enhanced control cliatmel
elements.
2. Tlie comln~~~iicatimoetit hod of clainl 1, wherein the system configuration
coiilprises the number of OFDMA symbols carried by the pl~ysicald ownlink control
channel and the nutiiber of reference signal ports.
3. The communication method of claitii 1, wherein tlie co~ifiguration of the
enhanced control chatmcl elements is classified into 4 classifications respectively
corresponding to different system config~~ratiotoisf the comn~unications ystem.
4. The coinnlunication nletliod of claim 3, wherein notifying the tcrtllitial node of
tlie information oti the deterniined classifications of the configuration of the enhanced
control channel elements comprises: packaging the infosmation on the determined
classifications of the configuration of tlie enhanced control chatniel elenients into a
first signaling of 2 bits; and transnlitting the first signaling to the teriilitial node.
5. The commu~iication method of any of claims 1-4, wherein deternlitiing the
classification of the configuration of the enlianced control channel elctnents
coniprises:
determining tlie classification of the configuration of the enlianced control
chatmcl elenients according to tlie nuniber of resource elctilents in one pl~ysical
resource block pair available to carry tlie enlianced physical do\vnli~kc ontrol cliatulel,
wherein:
in a first classification, each enlianced control channel eletiletit comprises 32 or
34 resource elements, and each physical resource block pair cat~ies 4 enhanced
control channel elements;
in a second classification, each enlianced control cl~antiele lenlent co~ilpsises3 0
or 32 resource eletnents, and each pl~ysical resource block pair carries 4 enlianced
control cliatu~eel lements;
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
in a third classification, eacli enhanced control chanu~ele le~ne~clotm prises 36 or
38 resource elements, and eacli physical resource block pair carries 3 enhanced
control channel elements; and
in a fourth classification, eaclt enhanced control chatme1 elenlent comprises 30 or
33 resource elements, and each physical resource block pair carries 3 enhanced
control channel elements.
6. The comtnunication method of claitli 4, wherein tlie first signaling is an
extension of an existing physical do\vnlink co~ltrol channel signaling or an enhanced
physical downlink control channel signali~ig.
7. The communication nlcthod of claim 4, wvl~erein transmitting the first
signaling to the ter~ninaln ode comprises:
transmitting the first signaling to tlie ter~ninal node by using an unoccupied
resource element in the enhanced physical do\vnliink control channel.
8. The comtnunication method of any of claitns 1-4, furtl~ecr omprising:
for each physical resource block pail; napping a plurality of enhanced channel
control elements irtto a plurality of resource ele~nentso f the pl~ysicalr esource block
pair, wlierein the plurality of enhatlced channel cotitrol ele~ne~lotsf the physical
resource block pair are contiguously mapped into the plurality of resource elements
according to a diago~iallya rranged pattern.
9. The communication metl~odo f claim 8, wherein u~ioccupiedr esource elements
in the pl~ysicalr esource block pair are mapped, according to a unifortnly distributed
pattern, preceding or follo\viilg each enhanced coiltrol channel element.
10. The communication metliod of claim 8, \vI~erein the etlhatlced physical
dolvnlink control channel is mapped into one physical resource block pair in a
Iocalizcd lnanner or mapped into a plurality of physical resource block pairs in a
distributed malnler.
11. A coniniunication metliod for use in a \\ireless communication system,
conlprising:
receiving, by a terminal node it1 the colnm~~nicatiosny stem from a base station it1
tlie communication system, inforniatiotl on classificatio~ol f configuratioa of enhanced
colltrol cha~nlel elements, \vlierein the configuration of c~lhanced control channel
ele~nents conlprises tlie number of resource eletnents in each enhanced co~itrol
channel eletnent and the nu~nber of enhanced control charutel ete~nents in eaclt
physical resource block pail; and wherein the configuration of enhanced control
channel elements is classified illto a plurality of classifications which respectively
correspond to different system configurations of the communication system; and
performing detnodulation for the enhanced co~itrolc hannel ele~nentsa ccording
to the classification of the configuration of e~lhancetcl o~ltrocl hannel elements.
12. Tlie communication method of claim 11, wherein receiving the information
011 the classification of the configuratio~l of enllaticcd cotitrol channel cle~nents
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
comprises:
receiving a first signaling of 2 bits in \vhich the infonuation on the classification
of the configuratioti of e~lfianced control channel elenlents is packaged.
13. The conlnlunication method of claim 11, wherein receiving the infomtation
on the classificatio~l of the configuration of enhanced control chatulel elements
co~ilprises:
receiving information on physical co~ltroflo rmat indication channel;
calculating the nunlber of resource eletnents available to carry the enhanced
physical dolvnlink control channel based on the inforn~ation on physical control
forlnat indication channel, atid
obtaining the classification of the configuration of enhanced control channel
elements by querying a pre-stored table containing configurations of enhanced control
channel elements.
14. The comtnunication tnethod of any of claitns 11-13, wherein the
configuration of e~lflancedc ontrol channel ele~nentsis classified into 4 classifications.
15. The comn~unicationm ethod of claim 14, wherein:
it1 a first classification, each enhanced control channel elenlent cotnprises 32 or
34 resource elements, and each physical resource block pair carries 4 enhanced
control channel elements;
in a second classification, each enhanced control channel element comprises 30
or 32 resource elcn~cnts, and each physical resource block pair carries 4 enhauced
co~ltrocl hannel eletnents;
in a third classification, each enhanccd control channel elenlent comprises 36 or
38 resource elements, and each physical resource block pair carries 3 enhanced
control channel elements; and
in a fourth classification, each enhanced control channel clement comprises 30 or
33 resource elcmc~lts, and each physical rcsource block pair carries 3 enhanced
control channel elements.
16. The cotntn~~nicatiotnn ethod of any of claims 11-13, v~hereint he terlninal
node contiguously den~odulates a plurality of resource elenlents in the pllysical
resource block pair in a diagonally arranged lilanncr to obtain the respective enhanced
control cliant~eel lements.
17. The communication ruethod of clainl 16, wherein unoccupied resource
elements in the physical resource block pair are mapped, according to a uniformly
distributed pattern, follo\\~inge ach e~lhancedc ontrol clia~uleel lement, and wherein the
terlninal node skips the unoccupied resource elenlents after performing the
demodulation for each enhanced control chatmcl element, or
unoccupied resource elenlents in the physical resource block pair are mapped,
according to a uniformly distrib~~tepdat tern, preceding each enhanced control channcl
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
element, and \vhereiri the tertninal node skips the unoccupied resource elenlcnts
before perfomling the deniodulation for each enhanced control channel element.
18. The conntn~~~icantlcitoh~od~ of claim 16, wherein the tenninal node performs
de~nodulation for enhanced control cllannel elcnlents in one physical resource block
pair in a localized manner to obtain an enhanced pllysical downlink control cha~ulel,
or the ternlinal node perfonns detnodulation for enhanced control channel elements in
a plurality of pl~ysicalr esource block pairs to obtain an enhanced physical downlink
control chantlei.
19. A con~munication apparatus for use in a wireless communication system,
configured in a base station of the communication system and comprising:
a configuration classification determining device configured to deterniine a
classification of configuration of enhanced control channel elements in an enhanced
pl~ysical downlink control channel according to current systenl configuration of the
conl~llunication system, wherein the configuration of e~lhanccd control channel
ele~nents comprises the nunlber of resource elements in each elhanced control
channel ele~nent and the n~itnber of enhanced control channel elenlents in each
~~hysicarel source block pair, and wllerein the configuration of enhanced control
channel elements is classified into a plurality of classifications which respectively
correspond to different system configurations of the co~itnlunications ystem; and
a transmitting device config~~retod notify a terniinal node in the cotntn~t~~icatio~~
system of information on the deter~nined classification of the configuration of
enhanced control channel elements.
20. A conununication apparatus for use in a wireless conimunication system,
configured in a tertninal node of the con~nlunicationsy stenl and comprising:
a receiving device configured to receive inforntation on classification of
configuration of etll~anccdc ontrol channel elements transmitted from a base station in
the communication system, wherein the configuration of enhanced control cha~ulel
elements comprises the number of resource elenlcnts in each enhanced control
channel elenlent and the nuinher of enhanced control channel elements in each
physical rcsourcc block pair, and wherein the configuration of enhanced control
channel elenients is classified into a plu~ality of classifications which respcctively
correspond to different system coilfigurations of the commnt~ication system; and
a processing dcvicc configured to perfomi demodulation for the enhanced
control chatulel elenients according to the classification of the configuration of
enhanced control channel elements.
21. A conlnnnlication method for use in a wireless co~nnninication system,
comprising:
determining, by a base station in the communication systcnl, a classification of
configuration of e~lhanccdc ontrol channel eletnents in an enhanced physical dowvnlink
control channel according to currcnt systcm configuration of the communication
system, wherein the configuration of enhanced control chatnlel elements comprises
Sony China Ref.: CNPA120241N00
Sony Ref.: SP3468331N00
Our Ref.: OP1413-06-0101
tlie nulnber of resource elements in each elharlced control cha~u~eelle ~nenta nd the
number of eilhanced control channel elements in each pliysical resource block pail;
and \vllerein the configuration of enhanced co~ltrolc liamiel elements is classified illto
a plurality of classifications \vI~icli respectively correspolid to diffe~.eiit system
configuratio~lso f the colmnunication system;
~lotifying,b y the base station, a terlninal node in tlie co~lirnu~licatiosny stem of
infonnation on the determined classificatio~ol f the co~ifiguratio~ofl enhanced coiltrol
clia~u~eelle me~its;
receivine, by the teniiinal node, the informatiou on the classificatioll o;' file
configuration of enhanced control channel ele~llei~ttrsa ilsnliiicd fro111 the base staiion;
aiid
perfo~~uinbgy, tlie terlninal node, demnodulatiol~fo r the enhanced control channel
elements according to the classification of the configuratioli of eullanced control
channel elements.
22. A wireless con~lliutlications ystem, co~lq~risinag b ase station and a terlninal
node, wherein the base station comprises:
a configuration cI&sificatioll detertili~lil~dge vice colrfigured to deteriililie a
classificatiori of configuration of ellliaiiced control cha~lnele le~nentsi n an eidianced
physical downlink control clian~lela ccording to current system cot~figurationo f the
.communicatio~-s ystem, ~vlierein the configuration of ellhanced control chainlel
elelllellts co~liprises the nuiilber of rcsource elcments in each eilhanced coiltrol
cliaiuiel element and tlie nulnber of enhanced coiltrol chalulel elellleilts in each
pl~ysical resource block pail; and wherein the configuratioli of enhanced coiitrol
cllal~nel eleme~its is classified into a plurality of classifications ~vhicli respectively
cor1espond to different system configurations of the co~iuilunicatios~yis telu; and
a trans~i~ittiiidge vice configured to notify a terminal node in the colluilunication
system of inforlnatioll oli the determilied classificatioll of the collfiguration of
enhanced co~ltrocl hatu~eel lemelits, and
wherein the terminal node cotiip~.ises:
a receiving devicc configured to reccive the illformatioil on the classification of
the config~~ratiootlf enhanced corltrol cliaimel eletlients transmitted From the base
station; and
a processiiig device configured to perform deillodulatio~l for the erlliailced
control channel elements accordilig to the classification of the co~lfiguratioli of
e~lhancedc o~ltrocl l~a~uleelle ments.