I 1111111111111111 1111111111 111111111111111 IIIII IIIII 11111 111111111111111111
`US010193600B2
`
`(12i United States Patent
`Faxer et al.
`
`US 10,193,600 B2
`(101 Patent No.:
`(45J Date of Patent:
`Jan.29,2019
`
`(54) C'ODEBOOK SUBSET RESTRICTION
`SJG"1ALI:\'G
`
`(71) Applicant: Tclcfonaktiebohlget L,1 Ericsson
`(pub!), Stockholm (SE)
`
`(72)
`
`Inventors: Sebastian Faxer. Jarfalla (SE): \lattias
`Frcmw. llppsala (SF); Simon Jiirmyr.
`Skarpnack (SE): George Jongrm.
`Sundbyhcrg (SF); \iklas \Vcrncrsson.
`Solna
`
`(73)
`
`.'\.ssignee: Telefonakticholagct L\1 Ericsson
`(puhl). Stockholm (SF)
`
`( *) Notice:
`
`Subject to any disclaimer, the term of this
`p:1t,mt is cxtrn1dcd or adjusll·d unckir :,5
`U.S.C. I 54(b l by 224 days.
`
`(21) Appl. No.:
`
`15/105,648
`
`(22) PCT Filed
`
`.Ian. 11, 2016
`
`(Sli)
`
`l'CT No.:
`
`PCT/SE2016/050009
`
`~ 371 (cJ(l).
`(2) Date:
`
`,Jun. 17, 2016
`
`(87) PCT Pub. No.: \VO2016/l 14708
`PCT Pub. Date: .lul. 21, 2016
`
`(65)
`
`Prior Publication Data
`
`US 20J8i013J420 Al
`
`]\fay I 0, 2018
`
`Related U.S. Application Data
`
`(60) Provisional application No. 62/103.101. filed on Jan.
`14. 2015.
`
`(51) Int.Cl.
`H/148 7/04
`1103M mo
`
`(2017.01 J
`(2006.01 J
`(Continued)
`
`(52)
`
`l!.S. Cl.
`CPC
`
`ll/J4B 7/0469 (201'.\.0I); ll/J3M 71306,~
`12013.01 ): Il/J4B 7/0456 (20JJ.0l ):
`(Continul?d)
`(58) Fi('ld of Classitication Search
`H04H 7/04<i'l: I 104H 710478; H04B 7/06YJ:
`Cl'C
`l lO~M 7/3068: I 1011\1 7/~082
`S,·,· application file for compktc srnrch hisloI).
`
`(5(,)
`
`References Cited
`
`U.S. P.\'I FNT l >OC\JMFNTS
`
`7010'022J)17 ,\I
`20ll'0170(,JS Al
`
`\1ishrn ct al
`9'2010
`7•2011 Yuan l'l al.
`(( ·ominued)
`
`FORFIUN f'A,TFNT J)OClJMFN'IS
`
`rrn
`
`20 I 114006S A
`
`4:20 I 1
`
`OTIIER PUI3LICATIONS
`
`,\lamcldcen ,\. ct al. 'Trcq1wn1 Pattern C0mprcssion: .\ Significan,·c(cid:173)
`Bascd C0mprcssi0n Scheme for I : Caches", Technical Rcporl
`111,00. vfay 1, 2001, rr 1-1:i, University ,if Wisconsin.
`(( ·ontinucd)
`
`Hria11 I) Nguy~n
`Primary J<:xaminer
`Co,1ts &:. Bennett. PL.LC
`(74) Ailomev. Agem, or f'in11
`
`ABSTR\( :·1
`
`(57)
`;\ nct\\ork node (10) sigmls to a \\·irclcss ,:ommunication
`device (14) which precode rs in ;1 cndebunk me restridecl
`from being usl'd. Th'-' ndv,ork nmk (JO) in this reg;ml
`generates i:ndd1or1k subset ri.,strictiun signaling tlwt, for
`c;1d1 r,f,111<.· or rm.ire groups urpnxndc,rs,_iointly n:stricts the
`prccnders in the' group hy restricling a certain cumpuncnt
`(e.g .. :1 ccrlc1in beam precodcr) tlrnt the prccnclers in the
`group have in cnmrrnrn. This sign;.iling may be for inst:111ce
`rank-agnostic signaling th;itjointly restrids the precuders in
`a group v, itlmut regard tu the precnders • transmission rank.
`Regardless. ihe 1wtv.ork node (10) sends the generated
`signaling to the \Yirclcss co111111miicatio11 de,·ice ( 14 ).
`
`28 Claims, 14 Drawing Sheets
`
`Generate codebook subset restriction signaling that, for
`each of one or more groups of precoders, jointly restricts
`the precoders in the group
`
`Send the generated signaling to the wireless
`communication device
`
`210
`
`220
`
`Samsung Ex. 1001
`
`

`

`US 10,193,600 B2
`Page 2
`
`(51)
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`(52)
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`(2017.01)
`(200G.0J)
`
`Int.Cl.
`II04B 710456
`Il04B 7/06
`lJ.S. C1.
`/Jf/48 7/f/478 (201'.0l ); 111148 7/1/f,58
`CPC ........
`(2013.01 ): II03J1 7/3082 (2013.0l); Jl04B
`7/0639 (2013.01)
`
`2014 10198S6S ,\1 '"
`
`712014 Yang .....
`
`2014'0205031 ,\l '"
`
`712014
`
`'.Jammi
`
`2014'02,,t,IJS ,\l '''
`
`1)12014 Krishnamurthy
`
`2014'026'),,7 ,\ 1 ,,.
`
`'l7014 Hammarwall
`
`2016'02B 1J1CJ
`
`.\9'''
`
`812016 Hammarnall
`
`H04B 7 0478
`3751167
`H04B 7,0413
`375 .. 267
`H04B 7,(1'117
`370,329
`H04B 7 0634
`370,329
`H04B 7 0634
`
`(56)
`
`Reforences Cikd
`
`U.S. L'AlliNT DOCUMJ.:NTS
`
`201 l 10143090
`2Ull '0249713
`7017 100'.'0414
`201Y01636o7
`
`Al
`.\1
`\ 1
`Al '1'
`
`l1J121Jll Koivisto et al.
`lU12Ull Hanurnuwall el al.
`117017 Callard cl al.
`612013 Jin12
`
`201Y02299o0
`20 l ,\i{J(J l 6549
`
`Al
`.\ l ,,,
`
`912013 Wernersson et al.
`\!2014
`\ovlan
`
`20l4'019S7'i I
`
`.\l '''
`
`712014 Prasad
`
`O'llll'R l'Ul3LICAJJONS
`lhomas, vi. cl al., "~kmcnts or lnf<,rmali,,n !henry", Chapter 3.
`;\symplolic Equipartilinn Prnpcrty', Jan. I. 2006, pp. :i7-62, Scc,md
`edition. John \Viky & Sons. Inc.
`Lricsson, "Remaining Details or C,)dcbook Subset Restriction·'.
`3(iPP TSG-lt\'/ \\G li/X,, .\nahcim. l JS.\, t\,,,. 15, 2015, pp 1-6.
`Rl-157203. 3UPP.
`AT&T ··wr on class A and dass B CS! reporting for RcL13 EB
`FD-MlvlO". ,GPP TSG R.\'/ WGI vlccting !'82bis, Malrnii.
`Sweden, Oct.\ 201\ pp. 1-10, Rl-lS61(,,. l<iPP .
`
`'' cited by examiner
`
`110413 7, 065~
`3i~,'2({i
`
`fl(),.JH 7, 0417
`.3 70/32~
`fl(),JH 7 0452
`370 329
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`.Jan. 29, 2019
`
`Sheet 1 of 14
`
`lJS 10,193,600 82
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`Samsung Ex. 1001
`
`

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`Consider a first group
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`,,,
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`_100
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`Identify one or more reference configurations for the
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`Identify the actual configuration to be signalled for the
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`-·-· ............. - -···-·· .. -··· ................................... ·-····· ·•-·-·-······ .. ·-······· ·······-················-·····--····· ....... .
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`whose length depends on (i) whether the actual
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`,-150
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`communication device
`
`, /·-160
`i/
`
`Figure 2
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`Jan. 29, 2019
`
`Sheet 3 of 14
`
`us 10,193,600 82
`
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`
`Samsung Ex. 1001
`
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`FIGURE 4
`
`Samsung Ex. 1001
`
`

`

`Generate codebook subset restriction signaling that, for
`each of one or more groups of precoders, jointly restricts
`the precoders in the group
`
`.,------ 21 0
`//
`
`Send the generated signaling to the wireless
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`
`'-JI
`
`0 ....
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`Figure 5
`
`Samsung Ex. 1001
`
`

`

`J4Jim i 32
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`Samsung Ex. 1001
`
`

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`

`

`U.S. Patent
`
`Jan.29,2019
`
`Sheet 8 of 14
`
`us 10,193,600 82
`
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`Samsung Ex. 1001
`
`

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`Identify one or more reference configurations for the group,/
`the bit pattern defined for signaling each reference
`configuration and the length of that bit pattern
`
`..
`
`Detect the actual configuration signaled for the group, by
`detecting a bit pattern in the signaling whose length
`depends on {i) whether the actual configuration matches
`one of the one or more reference configurations; and/or {ii)
`which reference configuration the actual configuration
`matches
`
`330
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`Figure 9
`
`Samsung Ex. 1001
`
`

`

`/--400
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`Receive signaling from the netv11ork node
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`Decode the signaling as jointly restricting the precoders in /
`each of one or more groups of precoders
`
`/-410
`
`Figure 10
`
`0
`
`0 -
`
`Samsung Ex. 1001
`
`

`

`U.S. Patent
`
`.Jan. 29, 2019
`
`Sheet 11 of 14
`
`us 10,193,600 82
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`U.S. Patent
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`Jan.29,2019
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`Jan.29,2019
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`US 10,193,600 B2
`
`1
`CODEBOOK SUBSET RESTRICTION
`SIGNALING
`
`RELATED APPLICATIONS
`
`This application claims priority to U.S. Provisional patent
`Application Ser. No. 62/103,101 filed Jan. 14, 2015, the
`entire contents of which are incorporated herein by refer(cid:173)
`ence.
`
`TECHNICAL FIELD
`
`The present application relates generally to a network
`node and a wireless communication device for operation in
`a wireless communication system, and more particularly to
`the network node signaling to the wireless co111111unication
`device which precoders in a codebook are restricted from
`being used.
`
`BACKGROUND
`
`Tbe use of multiple antelll1as at the transmitter and/or the
`receiver of a wireless conununication system can signifi(cid:173)
`cantly boost the capacity and coverage of a wireless com(cid:173)
`munication system. Such MIMO systems can exploit the 25
`spatial dimension of the conununication cham1el. For
`example, several information-carrying signals can be sent in
`parallel using the transmit antennas and still be separated by
`signal processing at the receiver. By adapting the transmis(cid:173)
`sion to the current channel conditions, significant additional 30
`gains can be achieved. One fom1 of adaptation is to dynami(cid:173)
`cally, from one TTI to another, adjust the number of simul(cid:173)
`taneously transmitted information streams carrying signals
`to what the challl1el can support. This is co111111only referred
`to as (transmission) rank adaptation. Precoding is another 35
`form of adaptation where the phases and an1plitudes of the
`aforementioned signals are adjusted to better fit the current
`channel properties. The signals form a vector-valued signal
`and the adjustment can be thought of as multiplication by a
`precoder matrix. A conunon approach is to select the pre- 40
`coder matrix from a finite and indexed set, a so-called
`codebook. Such codebook-based precoding is an integral
`part of the LIE standard, as well as in many other wireless
`commtmication standards.
`Codebook based precoding can be regarded as a form of 45
`channel quantization. A typical approach (c.f. LIE and
`MIMO HSDPA) is to let the receiver recommend a suitable
`precoder matrix to the transmitter by signaling the precoder
`matrix indicator (PMI) over a feedback link. To limit sig(cid:173)
`naling overhead, it is generally important to keep the code- 50
`book size as small as possible if the feedback link has a
`limited capacity. This however needs to be balanced against
`the performance impact since with a larger codebook it is
`possible to better match the current channel conditions.
`For example, in the LTE downlink, the user equipment 55
`(UE) reports the precoding matrix indicator (PMI) to the
`eNodeB either periodically on the physical uplink control
`channel (PUCCH) or aperiodic on the physical uplink shared
`challl1cl (PUSCH). The former is a rather narrow bit pipe
`( e.g., using a few bits) where challl1el state infom1ation 60
`(CSI) feedback is reported in a semi-statically configured
`and periodic fashion. CSI feedback in this regard includes
`one or more challl1el quality indicators (CQis), PMis, and/or
`a transmission rank ( e.g., indicating a number of transmis(cid:173)
`sion layers). On the other hand, reporting on PUSCH is 65
`dynamically triggered as part of the uplink grant. Thus, the
`eNodeB can schedule CSI transmissions in a dynamic
`
`2
`fashion. In contrast to the PUCCH where the number of
`physical bits is currently limited to 20, the reports on
`PUSCH can be considerably larger. Thus, for feedback on
`PUCCH a small codebook size is desirable to keep the
`signaling overhead down. However, for feedback on
`PUSCH a larger codebook size is desirable to increase
`performance, since the capacity on the feedback channel is
`not as limited in this case.
`The desired size of the codebook may also depend on the
`10 transmission scheme used. For example, a codebook used in
`multi-user multiple input multiple output (MU-MIMO)
`operation could benefit more from having a larger number of
`elements than a codebook used in single-user multiple input
`15 multiple output (SU-MIMO) operation. In the fom1er case,
`a large spatial resolution is important to allow for sufficient
`UE separation.
`A convenient way to support different codebook sizes is
`to use a large codebook with many elements by default and
`20 apply codebook subset restriction in the scenarios where a
`smaller codebook is beneficial. With codebook subset
`restriction, a subset of the precoders in the codebook is
`restricted so that the UE has a smaller set of possible
`precoders to choose from. This effectively reduces the size
`of the codebook implying that the search for the best PMI
`can be done on the smaller unrestricted set of precoders,
`thereby also reducing the UE computational requirements
`for this particular search.
`Typically, the eNodeB would signal the codebook subset
`restriction to the UE by means of a bitmap in an a dedicated
`message part of the Antelll1ainfo information element (see
`the RRC specification, TS 36.331 ), one bit for each precoder
`in the codebook, where a 1 would indicate that the precoder
`is restricted (meaning that the UE is not allowed to choose
`and report said precoder). Thus, for a codebook with N
`elements, a bitmap of length N would be used to signal the
`codebook subset restriction. This allows for full flexibility
`for the eNodeB to restrict every possible subset of the
`codebook. There are thus i'' possible codebook subset
`restriction configurations.
`For large antenna arrays with many antelll1a elements, the
`effective beams become narrow and a codebook containing
`many precoders is required for the intended coverage area.
`Furthermore, for two-dimensional antelll1a arrays, the code(cid:173)
`book size increases quadratically since the precoders in the
`codebook need to span two dimensions, typically the hori-
`zontal and vertical domain. Thus, the codebook size (i.e. the
`total number of possible precoding matrices W) can be very
`large. Signaling a codebook subset restriction in the con(cid:173)
`ventional way by means of a bitmap with one bit for every
`precoder can thus impose a large overhead, especially if the
`codebook subset restriction (CSR) is frequently updated or
`if there are many users served by the cell which each has to
`receive the CSR.
`
`SUMMARY
`
`One or more embodiments herein include a method
`implemented by a network node for signaling to a wireless
`communication device which prccoders in a codebook arc
`restricted from being used. The method comprises generat(cid:173)
`ing codebook subset restriction signaling that, for each of
`one or more groups of precoders, jointly restricts the pre(cid:173)
`coders in the group by restricting a certain component that
`the precoders in the group have in common. The method
`further comprises sending the generated signaling from the
`network node to the wireless conmrnnication device.
`
`Samsung Ex. 1001
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`US 10,193,600 B2
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`3
`Embodiments herein also correspondingly include a
`method implemented by a wireless communication device
`for decoding signaling from a network node indicating
`which precoders in a codebook are restricted from being
`used. The method comprises receiving codebook subset
`restriction signaling that, for each of one or more groups of
`precoders, jointly restricts the precoders in the group by
`restricting a certain component that the precoders in the
`group have in common. The method further comprises
`decoding the received signaling as jointly restricting pre- 10
`coders in each of the one or more groups of precoders.
`In some embodiments, the codebook subset restriction
`signaling is rank-agnostic signaling that jointly restricts the
`precoders in a group without regard to the precoders'
`transmission rank.
`In some embodiments, the certain component comprises
`a beam precoder. In some embodiments, for example, a
`beam precoder is a Kronecker product of different beam(cid:173)
`forming vectors associated with different dimensions of a
`multi-dimensional antenna array. In this case, the different
`beamforming vectors may comprise Discrete Fourier Trans(cid:173)
`form (DFT) vectors.
`In other embodiments where the certain component com(cid:173)
`prises a beam precoder, a beam precoder is a beamfonning
`vector used to transmit on a particular layer of a multi-layer
`transmission. Different scaled versions of that beamfonning
`vector are transmitted on different polarizations.
`In still other such embodiments, a beam precoder is a
`beamforming vector used to transmit on: multiple different
`layers of a multi-layer transmission; multiple different layers
`of a multi-layer transmission, wherein the layers are sent on
`orthogonal polarizations; or a particular layer and on a
`particular polarization.
`In some embodiments, a precoder comprising one or more
`beam precoders is restricted if at least one of its one or more
`beam precoders is restricted.
`In any of these embodiments, the codebook subset restric(cid:173)
`tion signaling may comprise a bitmap, with difterent bits in
`the bitmap respectively dedicated to indicating whether or
`not different beam precoders are restricted from being used.
`Alternatively or additionally, a beam precoder may be a
`Kronecker product of first and second beamfonning vectors
`with first and second indices. In this case, the first and
`second beamforming vectors may be associated with differ(cid:173)
`ent dimensions of a multi-dimensional antenna array, and the
`codebook subset restriction signaling may jointly restrict the
`precoders in a group of precoders that have the same pair of
`values for the first and second indices.
`In some embodiments, each precoder comprises one or
`more beam precoders. In some of these embodiments, each 50
`beam precoder comprises multiple different components
`corresponding to difterent dimensions of a multi-dimen(cid:173)
`sional antenna array. The certain component in this case may
`comprise a component of a beam precoder.
`In some embodiments, the codebook subset restriction
`signaling jointly restricts the precoders in a group of pre(cid:173)
`coders that transmit at least in part towards a certain angular
`pointing direction, by restricting a certain component which
`has that angular pointing direction.
`Embodiments herein also include another method imple(cid:173)
`mented by a network node for signaling to a wireless
`communication device which precoders in a codebook are
`restricted from being used. The method comprises a number
`of steps for each of one or more groups of precoders in the
`codebook. These steps include identifying one or more
`reference configurations for the group. Each reference con(cid:173)
`figuration is one of different possible configurations that
`
`4
`restrict different subgroups of precoders in the group from
`being used. The steps also include identifying, from the
`different possible configurations for the group, an actual
`configuration to be signaled for the group. The steps also
`include generating signaling to indicate the actual configu(cid:173)
`ration for the group, by generating the signaling as a bit
`pattern whose length depends on (i) whether the actual
`configuration matches one of the one or more reference
`configurations and/or (ii) which reference configuration the
`actual configuration matches. The method further comprises
`sending the generated signaling to the wireless communi-
`cation device.
`Embodiments herein further include another correspond(cid:173)
`ing method implemented by a wireless conmmnication
`15 device for decoding signaling from a network node indicat(cid:173)
`ing which precoders in a codebook are restricted from being
`used. The method includes receiving signaling from the
`network node. The method also entails a number of steps for
`each of one or more groups of precoders in the codebook.
`20 These steps include identifying one or more reference con(cid:173)
`figurations for the group. Each reference configuration is
`one of different possible configurations that restrict different
`subgroups of precoders in the group from being used. The
`steps further include identifying a bit pattern defined for
`25 signaling each reference configuration, and a length of that
`bit pattern. The steps also include detecting an actual con(cid:173)
`figuration signaled for the group, by detecting in the signal(cid:173)
`ing a bit pattern whose length depends on (i) whether the
`actual configuration matches one of the one or more refer-
`30 ence configurations and/or (ii) which reference configura(cid:173)
`tion the actual configuration matches.
`In some embodiments, the signaling is a short bit pattern
`when the actual configuration matches any one of the one or
`more reference configurations and is a long bit pattern when
`35 the actual configuration does not match any of the one or
`more reference configurations. A long bit pattern has more
`bits than a short bit pattern. In this case, the one or more
`reference configurations for at least one of the one or more
`groups may comprise a single reference configuration, and
`40 different long bit patterns may be respectively defined for
`signaling difterent configurations other than the single ref(cid:173)
`erence configuration. Alternatively or additionally, a long bit
`pattern defined for signaling the actual configuration for the
`group may comprise; (i) a non-reference bit pattern defined
`45 for signaling that the actual configuration does not match a
`reference configuration for the group; and (ii) a bitmap
`comprising different bits respectively dedicated to indicating
`whether different precoders in the group are restricted from
`being used.
`In some embodiments, the one or more reference con-
`figurations for at least one of the one or more groups
`comprise multiple reference configurations. In this case,
`when the actual configuration matches a particular one of the
`multiple reference configurations, the signaling is a bit
`55 pattern whose length is shorter than that of a bit pattern
`generated when the actual configuration matches a difterent
`one of the multiple reference configurations.
`In some embodiments, the one or more reference con(cid:173)
`figurations for a group each have an actual or assumed
`60 higher probability of being signaled than any other possible
`configuration that is not one of the one or more reference
`configurations.
`In some embodiments, the method is performed for mul(cid:173)
`tiple different groups that respectively include difterent
`65 portions of the precoders in the codebook. In this case, the
`signaling indicates the actual configurations for the groups
`in a defined order. The one or more reference configurations
`
`Samsung Ex. 1001
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`US 10,193,600 B2
`
`6
`from a network node indicating which precoders in a code(cid:173)
`book are restricted from being used, according to some
`embodiments.
`FIG. 10 is a logic flow diagram of a method implemented
`by a wireless communication device for decoding signaling
`from a network node indicating which precoders in a code(cid:173)
`book are restricted from being used, according to other
`embodiments.
`FIG. 11 is a block diagram of a network node according
`10 to some embodiments.
`FIG. 12 is a block diagram of a network node according
`to other embodiments.
`FIG. 13 is a block diagram of a wireless communication
`device according to some embodiments.
`FIG. 14 is a block diagram of a wireless communication
`device according to other embodiments.
`
`DETAILED DESCRIPTION
`
`5
`for each group comprises a single reference configuration,
`and the single reference configuration for any given group is
`the actual configuration, if any, signaled immediately before
`that of the given group.
`In some embodiments, the codebook is a Kronecker
`codebook defined for a multi-dimensional antenna array and
`comprises different precoders indexed by different possible
`values of a single index parameter. In this case, the different
`possible values of the single index parameter are divided
`into different clusters of consecutively ordered values, and
`precoders in different ones of the one or more groups are
`respectively indexed by the different clusters of consecu(cid:173)
`tively ordered values.
`In some embodiments, the codebook is a Kronecker
`codebook defined for a multi-dimensional antenna array and 15
`comprises different precoders indexed by different pairs of
`possible values for a first-dimension index parameter and a
`second-dimension index parameter. In this case, precoders in
`each of the one or more groups are indexed by pairs that
`have the same value for either the first-dimension index 20
`parameter or the second-dimension index parameter.
`Embodiments herein further include corresponding appa(cid:173)
`ratus and computer program products.
`In at least some embodiments, sigualing a codebook
`subset restriction in this way advantageously lowers the
`signaling overhead imposed by transmitting the codebook
`subset restriction, while still allowing for flexibility in
`configuring different codebook subset restrictions.
`Embodiments herein therefore generally include methods
`to reduce the number of bits required for signaling a code(cid:173)
`book subset restriction configuration to a wireless commu(cid:173)
`nication device. TI1e methods in one or more of these
`embodiments do so by:
`Utilizing an explicit or implicit assumption about which
`sets of precoders are more likely to be restricted, and/or
`associating a group of precoders with a single codebook
`subset restriction bit.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is a logic flow diagram indicating codebook subset
`restriction (CSR) signaling between a network node and a
`wireless connnunication device according to one or more
`embodiments.
`FIG. 2 is a logic flow diagran1 of a method implemented 45
`by a network node for signaling to a wireless communica(cid:173)
`tion device which precoders in a codebook are restricted
`from being used, according to some embodiments.
`FIG. 3 is a block diagram of a two-dimensional antenna
`array of cross-polarized antenna elements according to some
`embodiments.
`FIG. 4 is a graph illustrating the angular pointing direc(cid:173)
`tions of precoders in a codebook according to some embodi(cid:173)
`ments.
`FIG. 5 is a logic flow diagram of a method implemented 55
`by a network node for signaling to a wireless communica(cid:173)
`tion device which precoders in a codebook are restricted
`from being used, according to other embodiments.
`FIG. 6 is a block diagram of an exemplary codebook
`according to some embodiments.
`FIG. 7 is a graph illustrating the angular pointing direc(cid:173)
`tions of precoders in a codebook according to other embodi(cid:173)
`ments.
`FIG. 8 is a block diagram of precoder groupings accord(cid:173)
`ing to some embodiments.
`FIG. 9 is a logic flow diagram of a method implemented
`by a wireless communication device for decoding signaling
`
`According to the flowchart of FIG. 1, a network node 10
`in a wireless connmmication network (e.g., an eNB in the
`network) signals a codebook subset restriction (CSR) con(cid:173)
`figuration 12 to a wireless connmmication device 14 (e.g., a
`UE). The device 14 then sends a chaimel state information
`25 (CSI) report 16 back to the network. This CSI report 16
`suggests which of different possible precoders in a codebook
`the network should use for transmitting to the device 14, but
`the CSI report 16 is restricted in the sense that there is a
`subset of precoders that cannot be reported by the device 14;
`30 that is, all precoders in the codebook cannot be selected and