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`US009642118B2
`
`02) United States Patent
`Lahetkangas et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 9,642,118 B2
`May 2, 2017
`
`(54) CONTROLLING A MODULATION AND
`CODING SCHEME l!"OR A TRANSMISSION
`BETWEEN A BASE STATION AND A USER
`EQUIPMENT
`
`(75)
`
`Inventors: Eeva Lahetkangas, Oulu (FI);
`Bernhard Raaf, Neuried (DE); Kari
`Pekka Pajukoski, Oulu (FD; Esa
`Tapanl Tiirola, Kempele (FI)
`
`(73) Assignee: Nolda Solutions and Networks Oy,
`Espoo (FD
`
`( *) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. J54(b) by O days.
`
`(21)
`
`Appl. No.:
`
`14/379,314
`
`(22)
`
`PCT Filed:
`
`Feb. 20, 2012
`
`(86)
`
`PCT No.:
`
`PCT/EP2012/052828
`
`§ 371 (c)(l),
`(2), (4) Date: Oct. 20, 2014
`
`(87)
`
`PCT Pub. No.: WO2013/123961
`PCT Pub. Date: Aug. 29, 2013
`
`(65)
`
`(51)
`
`(52)
`
`(58)
`
`Prior Publication Data
`
`US 2015/0036590 Al
`
`Feb. 5, 2015
`
`Int. Cl.
`H04L 1/00
`H04W 72/02
`H04L 2 7104
`U.S. Cl.
`CPC
`
`(2006.01)
`(2009.01)
`(2006.01)
`
`H04W 72101 (2013.01); H04L 1/ 0003
`(2013.01); H04L 1/0009 (2013.01);
`(Continued)
`Field of Classification Search
`None
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUIVIENT S
`
`2007/0117570 Al
`2007/0147535 Al
`
`5/2007 Noh et al. .................. 455/452.2
`6/2007 Niu et al.
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`CN
`EP
`
`7/2010
`101790228 A
`10/2007
`I 845 742 Al
`(Continued)
`
`OTHER PUBLICATIONS
`
`Motorola: "64QAM for HSDPA-Modulation Fonnat Indication";
`Rl-070568; 3GPP TSG RAN1#47bis, Sorrento, Italy, Jan. 15-19,
`2007; pp. 1-6; 3rd Generation Partnership Project (3GPP); Mobile
`Competence Centre; 650, Route des Luciole.s; F-06921 Sophia(cid:173)
`Antipolis Cedex; France, (6 pages).
`(Continued)
`
`Primary Examiner - Hassan Phillips
`Assistant Examiner - Ayanah George
`(74) Attorney, Agent, or Finn - Harrington & Smith
`
`ABSTRACT
`(57)
`It is described a method for controlling a modulation and
`coding scheme for a transmission between a base station and
`a user equipment, wherein the modulation and coding
`scheme is selectable based on a first modulation and coding
`scheme table including entries corresponding to a plurality
`of modulation and coding schemes with a first maximum
`modulation order or based on a second modulation and
`coding scheme table including entries corresponding to a
`plurality of modulation and coding schemes with a second
`maximum modulation order. The method comprises select(cid:173)
`ing, by the base station, the first modulation and coding
`scheme table or the second modulation and coding scheme
`table, and controlling, by the base station, the modulation
`and coding scheme for the transmission bel\veen the base
`station and the user equipment based on the selected modu(cid:173)
`lation and coding scheme table.
`
`16 Claims, 2 Drawing Sheets
`
`202
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`- - - 8x8 MIMO, adaptive MCS up to 256 OAM__,... 202
`
`Samsung Ex. 1005
`
`

`

`US 9,642,118 B2
`Page 2
`
`(52)
`
`U.S. Cl.
`CPC
`
`H04L 110015 (2013.01); H04L 110016
`(2013.01); H04L 110025 (2013.01); H04L
`27104 (2013.01); H04L 1/0026 (2013.01)
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`7/2007 Yoshida ........................ 375/219
`2007/0160122 Al
`2007/0291913 Al* 12/2007 Trainin ................... H04L 12/66
`379/93.08
`
`2009/0010211 Al
`2010/0238845 Al*
`
`1/2009 Sumasu et al.
`9/2010 Love .
`
`H04B 7/15528
`370/280
`
`2011/0235604 Al
`
`9/2011 Inoue et al.
`
`FOREIGN PATENT DOCUMENTS
`
`EP
`EP
`EP
`JP
`JP
`JP
`JP
`JP
`WO
`
`1845742 Al *
`1 903 692 Al
`1903692 Al *
`2006217173 A
`2008193520 A
`2008211344 A
`2010034834 A
`4823225 B2
`WO 2010/061825 Al
`
`10/2007
`3/2008
`3/2008
`8/2006
`8/2008
`9/2008
`2/2010
`11/2011
`6/2010
`
`H04L 1/0003
`
`H04L 1/0016
`
`OTHER PUBLICATIONS
`
`3GPP TSG-RAN WGl Meeting #47bis, Sorrento, Italy, Jan. 15-19,
`2007, Rl-070570, "Way forward for HS-SCCH part 1 structure for
`MIMO and 64QAM", Philips, Ericsson, Motorola, Nokia,
`Qualcomm, 3 pgs.
`3GPP TSG-RAN WGl Meeting #47bis, Sorrento, Italy, Jan. 15-19,
`2007, Rl-070635, "DRAFT Introduction of 64QAM for HSDPA",
`Ericsson, [Qualcomm Europe], [Motorola], [Philips], 11 pgs.
`3GPPTS 36.213, Vl0.3.0 (Sep. 2011), "3nt Generation Partnership
`Project; Technical Specification Group Access Network, Evolved
`Universal Terrestrial Radio Access (E-UTRA); Physical layer pro(cid:173)
`cedures (Release 1 O)", 122 pgs.
`3GPP TS 36.213 Vl0.4.0 (Dec. 2011); "3rd Generation Partnership
`Project; Technical Specification Group Radio Access Network;
`Evolved Universal Terrestrial Radio Access (E-UTRA); Physical
`layer procedures (Release 10)"; 125 pages (pp. 32-34, 63-65).
`3GPP TS 36.213 Vl2.3.0 (Sep. 2014); "3rd Generation Partnership
`Project; Technical Specification Group Radio Access Network;
`Evolved Universal Terrestrial Radio Access (E-UTRA); Physical
`layer procedures (Release 12)"; 212 pages (pp. 46-48, 94).
`Chin-Hung Chen, et al.; IEEE 802.ll-10/136lr3; "IEEE P802.ll
`Wireless LANs; Proposed TGac Draft Amendment"; Jan. 2011; 154
`pages (pp. 139-148).
`
`* cited by examiner
`
`Samsung Ex. 1005
`
`

`

`U.S. Patent
`
`May 2, 2017
`
`Sheet 1 of 2
`
`US 9,642,118 B2
`
`FIG 1
`
`103
`
`100
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`
`Samsung Ex. 1005
`
`

`

`U.S. Patent
`
`May 2, 2017
`
`Sheet 2 of 2
`
`US 9,642,118 B2
`
`FIG 3
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`Samsung Ex. 1005
`
`

`

`US 9,642,118 B2
`
`1
`CONTROLLING A MODULATION AND
`CODING SCHEME FOR A TRANSMISSION
`BETWEEN A BASE STATION AND A USER
`EQUIPMENT
`
`FIELD OF INVENTION
`
`The present invention relates to the field of cellular
`networks, especially to an evolution of LTE networks, and
`in particular to networks comprising LTE networks and
`evolved LTE networks.
`
`ART BACKGROUND
`
`10
`
`2
`coding scheme table comprising entries corresponding to a
`plurality of modulation and coding schemes with a second
`maximum modulation order. The method comprises select(cid:173)
`ing, by the base station, the first modulation and coding
`5 scheme table or the second modulation and coding scheme
`table, and controlling, by the base station, the modulation
`and coding scheme for the transmission between the base
`station and the user equipment based on the selected modu(cid:173)
`lation and coding scheme table.
`This aspect of the invention is based on the idea to extend
`the modulation and coding scheme table to a higher order
`modulation while remaining backward compatible. The first
`table may support for instance up to 64QAM ( quadrature
`15 amplitude modulation) and the second table may support for
`instance up to 256QAM, or any other higher order modu(cid:173)
`lation extension. It should be noted that although 256QAM
`is explicitly mentioned herein, any other higher modulation
`order than that used for the first table may be used, for
`20 instance also 128QAM or in general a higher modulation
`and coding scheme (MCS) which may be characterized by
`either modulation order or coding scheme of both.
`The idea of this method is to introduce a higher order
`modulation while still supporting a modulation and coding
`25 scheme (MCS) table being introduced for a lower modula(cid:173)
`tion order.
`The term "modulation order" in this context may be
`determined by the number of the different symbols that can
`be transmitted using it. In general MCS also considers
`30 different code rates and thus indicates the average number of
`payload bits that can be transmitted per symbol. The first
`maximum modulation order and the second maximum
`modulation order may be the same or may be different.
`The term "modulation and coding scheme table" may
`35 refer to the MCS table being defined in LTE and being used
`for determining and selecting appropriate modulation and
`coding schemes. The second table may be an extended MCS
`table being based on the MCS as defined in LTE but
`comprising entries corresponding to a higher order modu-
`40 lation. For instance, the backward compatibility may be
`ensured by having a first table exactly as it is currently
`defined in the LTE standard.
`The first and the second table may be different in some
`respects. For instance, one table may be biased more
`towards low MCS and the second towards high MCS values.
`For example, one table may have more MCS values below
`a certain threshold MCS. Also the density ofMCS values at
`lower MCS may be higher in one table or the center of
`gravity or average of the MCS values may be lower in one
`table. In one embodiment, one table is a mirror image of the
`other, for instance being mirrored at the middle MCS.
`The term "base station" in this context may denote any
`kind of physical entity being able to communicate with a
`user equipment or any other network device by selecting a
`55 modulation and coding scheme from such a MCS table. A
`base station in this context may be any kind of network
`device providing the required functionality for the method,
`it may also be a transceiver node in communication with a
`centralized entity. The base station may be for example a
`60 NodeB or eNB.
`The base station may either inform the UE explicitly
`about a change of the used MCS table or may inform and
`select the MCS table implicitly as part of the capability
`enquiry procedure.
`According to an embodiment of the invention, the second
`maximum modulation order is higher than the first maxi(cid:173)
`mum modulation order. In particular, the first maximum
`
`There have been further developments for LTE, for
`instance relating to a Beyond 4G (B4G) radio system which
`is assumed to be commercially available in 2020. It might
`however also be introduced in an evolution of LTE at any
`date within any new release.
`LTE provides a peak bit rate of 30 bps/Hz by using
`64QAM modulation and 8x8 MIMO transmission. As a
`result, B4G may require a higher order modulation, for
`instance 256QAM, than 64QAM in order to meet future
`requirements. Higher order modulations may be relevant for
`example in relay backhaul due to better channel quality and
`better radio frequency (RF) properties which are more easily
`feasible for relays than for user equipments (UEs) or for
`isolated indoor cells where the UEs are close by and
`therefore both having a good link to the access point and no
`or very little interference from other access points due to
`attenuation by the walls.
`The modulation order determination ofLTE Release 10 is
`described in TS 36.213 Vl0.3, chapter 7.1.7 and CQI
`definition in chapter 7.2.3. In LTE (and LTE-Advanced),
`theoretical spectral efficiency is restricted by 64QAM modu(cid:173)
`lation. An improved spectral efficiency may be gained with
`extension to 256QAM.
`In the LTE standard, there is defined a MCS (modulation
`and coding scheme) index and modulation table and CQI
`(channel quality indicator) table. These are used for deter(cid:173)
`mining and selecting appropriate modulation and coding
`schemes. The current tables support up to 64QAM. The
`problem is how to introduce a 256QAM extension or any
`other higher order modulation extension for LTE while
`maintaining backward compatibility and avoiding too much 45
`complexity.
`There may be a need for an improved and flexible system
`and method being adapted to allow an extension to a higher
`order modulation while remaining backward compatible for
`LTE. In particular it is desirable to maintain signaling 50
`formats in particular utilize the same number of bits as
`otherwise different encoding schemes need to be used and
`potentially so called blind decoding has to be applied.
`
`SUMMARY OF THE INVENTION
`
`This need may be met by the subject matter according to
`the independent claims. Advantageous embodiments of the
`present invention are described by the dependent claims.
`According to a first aspect of the invention there is
`provided a method for controlling a modulation and coding
`scheme for a transmission between a base station and a user
`equipment, wherein the modulation and coding scheme is
`selectable based on a first modulation and coding scheme
`table comprising entries corresponding to a plurality of 65
`modulation and coding schemes with a first maximum
`modulation order or based on a second modulation and
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`

`US 9,642,118 B2
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`3
`modulation order corresponds to 64QAM and the second
`maximum modulation order corresponds to 256QAM.
`It should be noted that also other modulation orders may
`be used, for instance 128QAM.
`Furthermore, a few high MCSs may be included in the
`first table to be able to quickly react in case the channel gets
`suddenly better.
`According to a further embodiment of the invention, the
`maximum modulation order may correspond to the highest
`modulation and coding scheme (MCS). Further, the highest
`modulation and coding scheme may be the same for both
`tables.
`According to a further embodiment of the invention, the
`method further comprises determining, by the base station,
`actual channel conditions of a radio transmission channel
`being used for the transmission between the base station and
`the user equipment, determining, by the base station, a
`maximum supported modulation order based on the deter(cid:173)
`mined actual channel conditions, and selecting, by the base 20
`station, the first modulation and coding scheme table or the
`second modulation and coding scheme table based on a
`comparison of the maximum supported modulation order
`with the first maximum modulation order and the second
`maximum modulation order.
`If the actual channel conditions do not support the higher
`order modulation or if the user equipment (UE) is not able
`to support the higher order modulation, the base station may
`perform the modulation and coding for the transmission
`based on the first table. If the actual channel conditions are
`good enough for the higher order modulation and if the UE
`supports the higher order modulation, the base station may
`perform the modulation and coding based on the second
`table supporting a higher order modulation, for instance up
`to 256QAM.
`According to a further embodiment of the invention, the
`method further comprises transmitting information to the
`user equipment being indicative for the selected modulation
`and coding scheme table.
`The base station may provide a signal to the UE com- 40
`prising information about the selected and used MCS table.
`The UE may then perform, based on this information,
`further actions, like CQI reports.
`According to a further embodiment of the invention,
`transmitting information to the user equipment is based on 45
`radio resource control signalling.
`By using a common signalling, the UE may be easily
`informed about the selected MCS table. This information
`may also be included in any information signal comprising
`information for the UE in view of any other resource control.
`According to a further embodiment of the invention,
`transmitting information to the user equipment is based on
`implicit signalling.
`This may refer to the case, wherein the UE may receive
`information from the base station and may determine based
`on this information the selected MCS table. This may be the
`case for instance as part of the capability enquiry procedure
`which also makes the capability available to the eNB.
`During this kind of set up procedure, where the eNB
`determines capabilities of the UE, the tables may be 60
`switched and the UE may be informed implicitly without
`specific signalling.
`According to a further embodiment of the invention, the
`method further comprises receiving confirmation informa(cid:173)
`tion from the user equipment being indicative for a per- 65
`formed change of the selected modulation and coding
`scheme table.
`
`4
`The base station may carry out the change from one table
`to the selected MCS table after receiving the confirmation
`signal from the UE. The confirmation signal may thus be
`indicative for a final change of the MCS tables to be carried
`5 out by the base station.
`According to a further embodiment of the invention, the
`first modulation and coding scheme table and the second
`modulation and coding scheme table each comprise a com(cid:173)
`mon subset of equal entries being arranged at same positions
`10 within the first modulation and coding scheme table and the
`second modulation and coding scheme table. In particular,
`the method further comprises after transmitting the infor(cid:173)
`mation to the user equipment being indicative for the
`selected modulation and coding scheme table and before
`15 receiving the confirmation information from the user equip(cid:173)
`ment, controlling the modulation and coding scheme for the
`transmission between the base station and the user equip(cid:173)
`ment based on the selected modulation and coding scheme
`table based on the common subset of entries.
`By using common entries in both MCS tables, the base
`station may use the common entries as long as there is no
`confirmation signal from the UE. This may provide the
`advantage that there is no misunderstanding and wrong
`modulation and coding as both parts (base station and UE)
`25 are using the same modulation and coding scheme (although
`they may possibly use different tables).
`According to a further embodiment of the invention,
`controlling an initial transmission between the base station
`and the user equipment is based on the first modulation and
`30 coding scheme table.
`The base station and the UE may use the MCS table
`having the lower maximum modulation order at the start of
`each communication. This may provide the advantage that
`each communication starts with the same table and after-
`35 wards the base station may decide whether to change the
`MCS table or not. The change may then be performed based
`on the actual channel conditions if the UE can support the
`MCS table supporting the higher order modulation.
`According to a further embodiment of the invention, the
`bits of carrying a modulation and coding scheme index are
`the same for the first modulation and coding scheme table
`and for the second modulation and coding scheme table.
`Thus, it may be ensured that there is a backward com(cid:173)
`patibility without having to amend the MCS tables in their
`existing form nor the coding and transmission mechanisms
`that are employed to convey the selection out of that table.
`In a more specific embodiment, the tables may have the
`same size. In particular, parts of the first MCS table and the
`second MCS table are equal, providing common entries as
`50 explained above. Entries of the first MCS table relating to
`very low modulation orders may be exchanged (redefined)
`for the second MCS table and may comprise the higher order
`modulations.
`According to a further embodiment of the invention, the
`55 actual channel conditions are determined based on a channel
`quality indicator being selectable based on a first channel
`quality indicator table supporting the first maximum modu(cid:173)
`lation order or based on a second channel quality indicator
`table supporting the second maximum modulation order, the
`method comprising receiving, by the base station, a channel
`quality indicator from the user equipment, and determining,
`by the base station, the actual channel conditions of the radio
`transmission channel being used for the transmission
`between the base station and the user equipment based on
`the received channel quality indicator.
`Like the MCS tables, also the CQI tables may be selected
`based on the selection of the MCS tables. If there is a switch
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`

`US 9,642,118 B2
`
`5
`or change from the first MCS table to the second MCS table,
`there may also be change from the first CQI table to the
`second CQI table. The UE may thus determine the CQI
`based on a table which corresponds to the selected MCS
`table.
`According to a further embodiment of the invention, the
`method further comprises selecting, by the base station, the
`first channel quality indicator table or the second channel
`quality indicator table based on the selected modulation and
`coding scheme table, and transmitting information to the
`user equipment being indicative for the selected channel
`quality indicator table.
`The information of the selected CQI table may be pro(cid:173)
`vided to the UE from the base station. The information may 15
`also be provided implicitly by informing the user equipment
`of the selected MCS table.
`According to a further embodiment of the invention, the
`first channel quality indicator table and the second channel
`quality indicator table each comprise a common subset of
`equal entries being arranged at same positions within the
`first channel quality indicator table and the second channel
`quality indicator table.
`Like the MCS tables, also the CQI tables may comprise
`a common subset. Thus, it may be ensured that, during
`switching, there are no misunderstandings between the UE
`and the base station.
`According to a second aspect of the invention, there is
`provided a base station for controlling a modulation and
`coding scheme for a transmission between the base station
`and a user equipment, wherein the modulation and coding
`scheme is selectable based on a first modulation and coding
`scheme table comprising entries corresponding to a plurality
`of modulation and coding schemes with a first maximum
`modulation order or based on a second modulation and
`coding scheme table comprising entries corresponding to a
`plurality of modulation and coding schemes with a second
`maximum modulation order. The base station comprises a
`selection unit being adapted to select the first modulation
`and coding scheme table or the second modulation and 40
`coding scheme table, and a control unit being adapted to
`control the modulation and coding scheme for the transmis(cid:173)
`sion between the base station and the user equipment based
`on the selected modulation and coding scheme table.
`The base station may be any type of access point or point 45
`of attachment, which is capable of providing a wireless
`access to a cellular network system. Thereby, the wireless
`access may be provided for a user equipment or for any other
`network element, which is capable of communicating in a
`wireless manner. The base station may be a NodeB, eNB, 50
`home NodeB or HeNB, or any other kind of access point or
`also a multihop node or relay. The base station may in
`particular be used for a B4G, LTE or 3GPP cell and
`communication.
`The base station may comprise a receiving unit, for
`example a receiver as known by a skilled person. The base
`station may also comprise a transmitting or sending unit, for
`example a transmitter. The receiver and the transmitter may
`be implemented as one single unit, for example as a trans(cid:173)
`ceiver. The transceiver or the receiving unit and the sending
`unit may be adapted to communicate with the user equip(cid:173)
`ment via an antenna.
`The base station further comprises a selection unit and a
`control unit. The selection unit and the control unit may be
`implemented as single units or may be implemented for
`example as part of a standard control unit, like a CPU or a
`microcontroller.
`
`6
`In one embodiment, the base station may further comprise
`a determination unit being adapted to determine actual
`channel conditions of a radio transmission charmel being
`used for the transmission between the base station and the
`5 user equipment, and being adapted to determine a maximum
`supported modulation order based on the determined actual
`channel conditions. The selection unit may be adapted to
`select the first modulation and coding scheme table or the
`second modulation and coding scheme table based on a
`10 comparison of the maximum supported modulation order
`with the first maximum modulation order and the second
`maximum modulation order.
`The determination unit may be implemented as a single
`unit or may be implemented for example as part of a
`standard control unit, like a CPU or a microcontroller.
`The user equipment (UE) may be any type of communi(cid:173)
`cation end device, which is capable of connecting with the
`described base station. The UE may be in particular a
`cellular mobile phone, a Personal Digital Assistant (PDA), a
`20 notebook computer, a printer and/or any other movable
`communication device.
`The user equipment may comprise a receiving unit or
`receiver which is adapted for receiving signals from the base
`station. The user equipment may comprise a transmitting
`25 unit for transmitting signals. The transmitting unit may be a
`transmitter as known by a skilled person. The receiver and
`the transmitting unit may be implemented as one single unit,
`for example as a transceiver. The transceiver or the receiver
`and the transmitting unit may be adapted to communicate
`30 with the base station via an antenna.
`The user equipment may further comprise a control unit
`for controlling and configuring the transmission based on
`information received from the base station being indicative
`for a selected MCS table. The control unit may be imple-
`35 mented as a single unit or may be implemented for example
`as part of a standard control unit, like a CPU or a micro(cid:173)
`controller.
`According to a third aspect of the invention, there is
`provided a cellular network system. The cellular network
`system comprises a base station as described above.
`Generally herein, the method and embodiments of the
`method according to the first aspect may include performing
`one or more functions described with regard to the second or
`third aspect or an embodiment thereof. Vice versa, the base
`station or cellular network system and embodiments thereof
`according to the second and third aspect may include units
`or devices for performing one or more functions described
`with regard to the first aspect or an embodiment thereof.
`According to a fourth aspect of the herein disclosed
`subject-matter, a computer program for controlling a modu(cid:173)
`lation and coding scheme for a transmission between a base
`station and a user equipment is provided, the computer
`program being adapted for, when executed by a data pro(cid:173)
`cessor assembly, controlling the method as set forth in the
`55 first aspect or an embodiment thereof.
`As used herein, reference to a computer program is
`intended to be equivalent to a reference to a program
`element and/or a computer readable medium containing
`instructions for controlling a computer system to coordinate
`60 the performance of the above described method.
`The computer program may be implemented as computer
`readable instruction code by use of any suitable program(cid:173)
`ming language, such as, for example, JAVA, C++, and may
`be stored on a computer-readable medium (removable disk,
`65 volatile or non-volatile memory, embedded memory/proces(cid:173)
`sor, etc.). The instruction code is operable to program a
`computer or any other progranmiable device to carry out the
`
`Samsung Ex. 1005
`
`

`

`US 9,642,118 B2
`
`5
`
`7
`intended functions. The computer program may be available
`from a network, such as the World Wide Web, from which
`it may be downloaded.
`The herein disclosed subject matter may be realized by
`means of a computer program respectively software. How-
`ever, the herein disclosed subject matter may also be realized
`by means of one or more specific electronic circuits respec(cid:173)
`tively hardware. Furthermore, the herein disclosed subject
`matter may also be realized in a hybrid form, i.e. in a
`combination of software modules and hardware modules.
`In the above there have been described and in the fol(cid:173)
`lowing there will be described exemplary embodiments of
`the subject matter disclosed herein with reference to a
`cellular network system, a base station and a method of
`controlling a modulation and coding scheme for a transmis- 15
`sion between a base station and a user equipment. It has to
`be pointed out that of course any combination of features
`relating to different aspects of the herein disclosed subject
`matter is also possible. In particular, some embodiments
`have been described with reference to apparatus type 20
`embodiments whereas other embodiments have been
`described with reference to method type embodiments.
`However, a person skilled in the art will gather from the
`above and the following description that, unless otherwise
`notified, in addition to any combination of features belong- 25
`ing to one aspect also any combination between features
`relating to different aspects or embodiments, for example
`even between features of the apparatus type embodiments
`and features of the method type embodiments is considered
`to be disclosed with this application.
`The aspects and embodiments defined above and further
`aspects and embodiments of the present invention are appar(cid:173)
`ent from the examples to be described hereinafter and are
`explained with reference to the drawings, but to which the
`invention is not limited.
`
`8
`of modulation and coding schemes with a first maximum
`modulation order or based on a second modulation and
`coding scheme table comprising entries corresponding to a
`plurality of modulation and coding schemes with a second
`maximum modulation order. In one embodiment, the second
`maximum modulation order is higher (for instance up to
`256QAM) than the first maximum modulation order (for
`instance up to 64QAM).
`The base station may determine actual charmel conditions
`10 of the radio transmission channel being used for the trans(cid:173)
`mission between the base station and the user equipment.
`Then, the base station may determine a maximum supported
`modulation order based on the determined actual channel
`conditions and eventually based on information from the
`user equipment which modulation order can be supported by
`the user equipment. The base station then selects the first
`modulation and coding scheme table or the second modu(cid:173)
`lation and coding scheme table based on a comparison of the
`maximum supported modulation order with the first maxi(cid:173)
`mum modulation order and the second maximum modula(cid:173)
`tion order. Thus, the modulation and coding scheme (MCS)
`for the transmission between the base station and the user
`equipment is controlled based on the selected modulation
`and coding scheme table.
`The base station may also select the table based on any
`other information, for instance based on predefined selection
`criteria.
`In LTE (and LTE-Advanced), theoretical spectral effi(cid:173)
`ciency is restricted by 64Q