(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`(19) World Intellectual Property
`Organization
`International Bureau
`
`(43) International Publication Date
`27 February 2014 (27.02.2014) WIPO I PCT
`
`~ ~
`
`1111111111111111 IIIIII IIIII 111111111111111 II Ill 111111111111111 IIIII lllll 11111111111111111111111
`
`(10) International Publication Number
`WO 2014/029108 Al
`
`(51) International Patent Classification:
`H04B 17/00 (2006.01)
`H04W 24/00 (2009.0l)
`H04L 1/00 (2006.01)
`
`(21) International Application Number:
`
`(22) International Filing Date:
`
`(25) Filing Language:
`
`(26) Publication Language:
`
`PCT /CN2012/080560
`
`24 August 2012 (24.08.2012)
`
`English
`
`(Sl)
`
`English
`
`(71) Applicant
`(for all designated States except US):
`PANASONIC CORPORATION [JP/JP]; 1006, Oaza
`Kadoma, Kadoma-shi, Osaka 571-8501 (JP).
`
`(72) Inventors; and
`(75) Inventors/Applicants
`(for US only): WANG, Lilei
`[CN/CN]; Panasonic Research & Development Center
`China Co., Ltd., 18th Floor, Zhongguancun Tower, No.27
`Zhongguancun Street, Haidian District, Beijing I 00080
`(CN). XU, Ming [CN/CN]; Panasonic Research & Devel(cid:173)
`opment Center China Co., Ltd., 18th Floor, Zhongguancun
`Tower, No.27 Zhongguancun Street, Haidian District,
`
`Beijing 100080 (CN). HOSHINO, Masayuki [JP/JP];
`Panasonic Corporation, 1006, Oaza Kadoma, Kadoma-shi,
`Osaka 571-8501 (JP). NISHIO, Akihiko [JP/JP]; Panason(cid:173)
`ic Corporation, 1006, Oaza Kadoma, Kadoma-shi, Osaka
`571-850 I (JP).
`
`(74) Agent: LIU, SHEN & ASSOCIATES; A060l, Huibin
`Building, No.8 Beichen Dong Street, Chaoyang District,
`Beijing lO0lOl (CN).
`
`Designated States (unless otherwise indicated, for every
`kind of national protection available): AE, AG, AL, AM,
`AO,AT,AU,AZ,BA,BB,BG,BH,BN,BR,BW,BY,
`BZ,CA,CH,CL,CN,CO,CR,CU,CZ,DE,DK,DM,
`DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT,
`HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP,
`KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD,
`ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI,
`NO, NZ, OM, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW,
`SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM,
`TN, TR, TT, TZ, VA, VG, US, UZ, VC, VN,ZA,ZM,
`ZW.
`
`--------------------------------------------
`
`(54) Title: COMMUNICATION METHOD, BASE STATION AND USER EQUIPMENT
`
`[Continued on next page]
`
`(57) Abstract: The present disclosure provides a
`communication method, base station and user
`equipment for configuring a parameter table in a
`wireless communication system including a base
`station and a user equipment, the communication
`method comprising: defining at both the base
`station and the user equipment a parameter table
`which includes whole entries of a legacy para(cid:173)
`meter table and extended entries; and transmit(cid:173)
`ting from the base station to the user equipment
`a bitmap indication which indicates a sub-table
`selected from the parameter table, wherein the
`number of the entries in the sub-table is the same
`as in the legacy parameter table.
`
`start
`
`701
`
`defining at both eNB and UE a parameter table
`which
`includes whole entries of a
`legacy
`parameter table and extended entries
`
`702
`
`to U E a bitmap
`transmitting from e N B
`indication which indicates a sub-table selected
`from the parameter table
`
`end
`
`Fig.7
`
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`WO 2014/029108 Al 111111 IIIIIIII II IIIIII IIIII lllll lllll 1111111111 lllll lllll 1111111111 lllll llll 1111111111111111111
`
`(84) Designated States (unless otherwise indicated, for every
`kind of regional protection available): ARIPO (BW, GH,
`GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ,
`UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ,
`TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK,
`EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU,
`LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK,
`
`SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ,
`GW, ML, MR, NE, SN, TD, TG).
`
`Published:
`-
`with international search report (Art. 21 (3))
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`WO 2014/029108
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`PCT/CN2012/080560
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`1
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`COMMUNICATION METHOD, BASE STATION AND USER EQUIPMENT
`
`TECHNICAL FIELD
`
`5
`
`The present disclosure relates to parameter table configuration technique in
`
`the communication field.
`
`10
`
`BACKGROUND ART
`
`In 3GPP (3rd Generation Partnership Project) Rel.8/9/10 system, Channel
`
`Quality Indicator (COi), one type of channel state information (CSI), is an
`
`important communication parameter used for scheduling and link adaptation at
`
`15
`
`eNodeB (eNB). In practice, since UE (user equipment) knows better about the
`
`downlink channel based on certain reference signal, like CRS (common
`
`reference signal) or CSI-RS (channel state information-reference signal), COi
`
`is calculated and recommended at UE side. Then, COi is feedback by the UE
`
`with a certain index in the COi table, which includes some combinations of
`
`20 modulation order and coding rate, referring to Table 7.2.3-1 in 3GPP TS
`
`36.213 V10.5.0, which is entirely incorporated hereto by reference.
`
`Fig. 1 shows the COi table in TS 36.213. It can be seen from Fig. 1 that the
`
`standard COi table, which may also be referred to as a legacy COi table,
`
`25
`
`includes 16 entries with indices from 0-15, corresponding to modulation
`
`schemes such as QPSK, 16QAM and 64QAM. Therefore, 4 bits are necessary
`
`to reflect a certain entry when the UE feedbacks a certain wideband COi to the
`
`eNB.
`
`30 As to other COi types defined according to different feedback modes or
`
`transmission modes, such as subband COi, spatial COi or UE selected COi,
`
`UE do not directly feedback the entry/index in the same COi table as shown in
`
`Fig. 1. Instead, an implicit mechanism is used to feedback their COi offset level
`
`from the wideband COi value. For example,
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`Subband differential CQI offset level = subband CQI index
`
`- wideband
`
`CQI index.
`
`Fig. 2 shows the subband differential COi table in TS 36.213. It can be seen
`
`5
`
`that the standard subband differential COi table, which may also be referred to
`
`as a legacy subband differential COi table, includes 4 entries with indices from
`
`0 to 3. Therefore, UE needs 2 additional bits to feedback the subband
`
`differential COi offset level.
`
`10
`
`Also, Modulation Coding Scheme (MCS) is an important communication
`
`parameter in 3GPP Rel.819110 system. MCS refers to which combination of
`
`modulation order and coding rate is used in physical transmission of downlink
`
`and uplink. There is also a table, called MCS table, restricts which combination
`
`of modulation order and transport block size could be used.
`
`15
`
`Fig. 3 shows the MCS table in TS 36.213. It can be seen that the standard
`
`MCS table, which may also be referred to as a legacy MCS table, includes 32
`
`entries with indices from 0-31, corresponding to modulation orders such as 2, 4
`
`and 6. The last three entries with indices 29-31 are used for re-transmission. In
`
`20
`
`3GPP, which MCS is used is informed in Downlink Control Information (DCI).
`
`And 5 bits are necessary for this indication.
`
`SUMMARY OF THE DISCLOSURE
`
`25
`
`With the future introduction of new technologies and new network delployment,
`
`such as 3D beamforming, massive MIMO and dense deployment of small cell
`
`etc., user equipment has more opportunities to maintain high quality wireless
`
`channel link with high SINR, so it is possible and benefical for the system to
`
`30
`
`support higher modulation orders than current system,
`
`like 256OAM or
`
`10240AM, in order to further improve the spectral efficiency and user
`
`throughput.
`
`Correspondingly, there is a need to configure the parameter table, such as the
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`COi
`
`table or the MCS
`
`table described above, so
`
`that more entries
`
`corresponding to higher modulation orders and/or coding rates than those in
`
`the legacy tables can be indicated. There is also a need to configure the
`
`differential COi table to indicate more COi offset levels, so that the indication of
`
`5
`
`the differential COi can be more accurate.
`
`The present disclosure is made in consideration of the above aspects.
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`According to one aspect of the present disclosure, there is provided a
`communication method of configuring a parameter table
`in a wireless
`communication system including a base station and a user equipment,
`comprising: defining at both the base station and the user equipment a
`parameter table which includes whole entries of a legacy parameter table and
`extended entries; and transmitting from the base station to the user equipment
`a bitmap indication which indicates a sub-table selected from the parameter
`table.
`
`According to another aspect of the present disclosure, there is provided a
`in a wireless
`communication method of configuring a parameter table
`communication system including a base station and a user equipment,
`comprising: defining at both the base station and the user equipment multiple
`parameter tables which include at least a legacy parameter table and an
`aggressive parameter table which includes new modulation order related
`entries or new combinations of modulation order and coding rate; and
`transmitting from the base station to the user equipment an indication which
`indicates a parameter table selected from the multiple parameter tables,
`wherein the number of entries in any one of the multiple parameter tables is
`the same as in the legacy parameter table to keep signaling overhead
`unchanged.
`
`According to a further aspect of the present disclosure, there is provided a
`in a wireless
`communication method of configuring a parameter table
`communication system including a base station and a user equipment,
`comprising: defining at both the base station and the user equipment a
`parameter table which includes whole entries of a legacy parameter table and
`extended entries; and transmitting from the base station to the user equipment
`an indication which indicates one entry of the parameter table, by legacy bits
`and at least one unused bit jointly.
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`4
`
`5
`
`10
`
`15
`
`20
`
`25
`
`According to a further aspect of the present disclosure, there is provided a
`communication method of configuring a parameter table
`in a wireless
`communication system including a base station and a user equipment,
`comprising: defining at both the base station and the user equipment a
`parameter table which includes whole entries of a legacy parameter table and
`extended entries; and transmitting from the base station to the user equipment
`an indication which indicates one entry of the parameter table by a number of
`bits, wherein the number of bits corresponds to the number of entries in the
`parameter table.
`
`According to a further aspect of the present disclosure, there is provided a
`base station for configuring a parameter table in a wireless communication
`system including the base station and a user equipment, comprising: a storing
`unit which stores a pre-defined parameter table including whole entries of a
`legacy parameter table and extended entries; and a transmitting unit which
`transmits to the user equipment a bitmap indication which indicates a sub-table
`selected from the pre-defined parameter table, wherein the number of the
`entries in the subtable is the same as in the legacy parameter table.
`
`According to a further aspect of the present disclosure, there is provided a user
`equipment for configuring a parameter table in a wireless communication
`system including a base station and the user equipment, comprising: a storing
`unit which stores a pre-defined parameter table including whole entries of a
`legacy parameter table and extended entries; and a receiving unit which
`receives from the base station a bitmap indication which indicates a sub-table
`selected from the pre-defined parameter table, wherein the number of the
`entries in the subtable is the same as in the legacy parameter table.
`
`30 According to a further aspect of the present disclosure, there is provided a
`communication method of configuring different COi tables for different COi
`types considering wideband COi is explicitely indicated by COi table but other
`COi tpye like spatial COi, subband COi or UE-selected COi is implicilty
`inidciated by subband differntial COi table.
`
`35
`
`According to a further aspect of the present disclosure, there is provided a
`communication method of configuring new parameter table in a wireless
`communication system including a base station and the user equipment, in
`which there is no half closed-interval definition for offset levels. Instead, only
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`5
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`values have been defined in the table and the indicated values based on
`bitmap form the full closed-interval table automatecally.
`
`According to the communication methods and communication apparatuses of
`various aspects of the present disclosure, more entries than those in the
`legacy tables can be indicated. Thereby, higher modulation orders can be
`supported to adapt channel and improve spectral efficiency but without
`increaseing the reported overhead.
`
`5
`
`10
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`These and/or other aspects and advantages of the present disclosure will
`
`become more distinct and easier to be understood in a detailed description of
`
`15
`
`embodiments of the present disclosure below in combination with attached
`
`drawings, in which:
`
`Fig.1 is a diagram showing the legacy COi table in the conventional
`
`communication system;
`
`Fig. 2 is a diagram showing the legacy subband differential COi table in
`
`20
`
`the conventional communication system;
`
`Fig. 3 is a diagram showing the legacy MCS table in the conventional
`
`communication system;
`
`Fig. 4 is a diagram schematically showing communication scenarios
`
`where UE has different modulation/coding rate requirements at different
`
`25
`
`positions;
`
`Fig. 5 is a diagram schematically showing communication scenarios
`
`where different carrier components (CCs) have different modulation/coding
`
`rate requirements;
`
`Fig. 6 is a diagram schematically showing communication scenarios
`
`30 where different links have different modulation/coding rate requirements;
`
`Fig. 7 is a flowchart showing an exemplary implementation of a
`
`communication method according to a first embodiment of the present
`
`disclosure;
`
`Fig. 8 is a diagram schematically showing an extended COi table and
`
`35
`
`corresponding bitmap examples according to the first embodiment of the
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`present disclosure;
`
`Figs. 9a and 9b are diagrams schematically showing two kinds of
`
`extended differential COi
`
`tables and corresponding bitmap examples
`
`according to the first embodiment of the present disclosure;
`
`5
`
`Figs. 1 0a and 1 Ob are diagrams schematically showing two kinds of
`
`extended MCS
`
`tables based on positions of
`
`reserved entries and
`
`corresponding bitmap examples according to the first embodiment of the
`
`present disclosure;
`
`Fig 11
`
`is a diagram schematically showing the configuration of a base
`
`10
`
`station according to the first embodiment of the present disclosure;
`
`Fig 12 is a diagram schematically showing the configuration of a user
`
`equipment according to the first embodiment of the present disclosure;
`
`Fig. 13 is a flowchart showing an exemplary implementation of a
`
`communication method according to a second embodiment of the present
`
`15
`
`disclosure;
`
`Fig. 14 is a diagram schematically showing a legacy parameter table and
`
`an aggressive parameter table according to the second embodiment of the
`
`present disclosure;
`
`Fig. 15 is a diagram schematically showing the configuration of a base
`
`20
`
`station according to the second embodiment of the present disclosure;
`
`Fig. 16 is a diagram schematically showing the configuration of a user
`
`equipment according to the second embodiment of the present disclosure;
`
`Fig. 17 is a flowchart showing an exemplary implementation of a
`
`communication method according to a third embodiment of the present
`
`25
`
`disclosure;
`
`Fig. 18 is a flowchart showing an exemplary implementation of a
`
`communication method according to a fourth embodiment of the present
`
`disclosure; and
`
`Fig. 19 is a diagram schematically showing a new transmission format
`
`30
`
`according to the fourth embodiment of the present disclosure.
`
`DESCRIPTION OF THE EMBODIMENTS
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`7
`
`In the following detailed description, reference is made to the accompanying
`drawings, which form a part thereof. In the drawings, similar symbols typically
`identify similar components, unless context dictates otherwise. It will be readily
`understood that the aspects of the present disclosure can be arranged,
`substituted, combined, and designed
`in a wide variety of different
`configurations, all of which are explicitly contemplated and make part of this
`disclosure.
`
`(First Embodiment)
`
`A communication method of configuring a parameter table in a wireless
`communication system including an eNode Band a UE is provided in the first
`embodiment of the present disclosure. The communication method comprises
`the steps of: defining at both the eNode Band the UE a parameter table which
`includes whole entries of a legacy parameter table and extended entries; and
`transmitting from the eNode B to the UE a bitmap indication which indicates a
`sub-table selected from the parameter table, wherein the number of the entries
`in the sub-table is the same as in the legacy parameter table.
`
`Before the detailed explanation on the implementation of the communication
`method according to the first embodiment of the present disclosure, a
`description will be made to different communication scenarios of UE as well as
`different requirements on modulation order/coding rate, with reference to Figs.
`4-6.
`
`Fig. 4 is a diagram schematically showing communication scenarios where UE
`has different modulation/coding rate requirements at different positions.
`
`5
`
`10
`
`15
`
`20
`
`25
`
`local area or massive
`in a
`is
`in Fig. 4, UE 401
`As shown
`30 multiple-input-multiple-output (MIMO) scenario 400. It is found that UE 401
`may have different requirements on modulation order/coding rate at different
`positions. For example, UE 401 will experience different signal-to-noise ratio
`(SINR) conditions when it is at different positions. Specially, if UE 401
`is
`moving slowly from cell edge (e.g. position A) to a position (e.g. position B)
`closer to the cell center, and finally to the cell center (e.g. position C), it will
`experience low SINR, medium-high SINR and very high SINR conditions,
`respectively. Obviously, low SINR area needs a relatively lower effective
`coding rate, while high SINR area needs a relatively high effective coding rate.
`
`35
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`Fig. 5 is a diagram schematically showing communication scenarios where
`different carrier components (CCs) have different modulation/coding rate
`requirement.
`
`5
`
`10
`
`15
`
`20
`
`In the scenario of carrier aggregation (CA), as shown in Fig.5, similarly, it is
`found that different CCs may also have different modulation/coding rate
`requirements due to different SINR/interference/channel conditions. For
`example, for CCs from Pcell to UE, such as carrier 1, there may be a
`requirement on a conservative COi table (e.g. the legacy COi table) for robust
`access; while for CCs from Scell to UE, such as carrier 2, there may be a
`requirement on an aggressive COi table for boosting throughput.
`
`Fig. 6 is a diagram schematically showing communication scenarios where
`different links have different modulation/coding rate requirement.
`
`In the scenario of Fig.6, similarly, it is found that uplink and downlink may have
`different modulation/coding
`rate
`requirements
`due
`to
`different
`SINR/interference/channel
`conditions.
`For
`example,
`for
`downlink
`transmissions, there may be a requirement on a conservative COi table (e.g.
`the legacy COi table) due to much active downlink traffic; while for uplink
`transmissions, there may be a requirement on an aggressive COi table due to
`less uplink traffic, and hence high SINR.
`
`From Figs. 4-6, it is expected that different parameter tables, such as COi/
`25 MCS table, which include special combinations of modulation order/coding
`rate, could be used in different SINR conditions to adapt different channel and
`get better performance. In other words, there is no need to apply the same
`parameter table for different communication scenarios. Only some entries in
`the parameter table may be enough in a certain communication scenario.
`
`30
`
`The communication method according to the first embodiment of the present
`disclosure is designed in view of the above analysis, in order to meet different
`modulation/coding rate requirements.
`
`35
`
`Now, a detailed description on the communication method according to the first
`embodiment of the present disclosure will be made with reference to Fig. 7.
`
`the
`implementation of
`flowchart showing an exemplary
`is a
`Fig. 7
`communication method according to the first embodiment of the present
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`9
`
`disclosure. The communication method according to the first embodiment is
`used for configuring a parameter table in a wireless communication system
`including an eNode Band a UE.
`
`5 As shown in Fig. 7, the communication method starts at step 701, where a
`parameter table is defined at both the eNode Band the UE.
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`The parameter may be various communication parameters communicated
`between UE and eNode B. For example, the parameter may be COi,
`differential COi offset level and/or MCS. Correspondingly, the parameter table
`may be a COi table, a differential COi table or a MCS table.
`
`In addition, the parameter table may include the whole entries of a legacy
`parameter table and some extended entries. The entries of the legacy
`parameter table may be standard entries defined in standards such as 3GPP
`TS 36.213, and they may correspond to communication scenarios where
`relatively conservative modulation orders/coding rates are required. The
`extended entries may be extended entries defined according to the first
`embodiment of the present disclosure, and
`they may correspond
`to
`communication
`scenarios where
`relatively
`aggressive modulation
`orders/coding rates are required.
`
`Next, at step 702, the eNode B transmits to the UE a bitmap indication which
`indicates a sub-table selected from the parameter table.
`
`Specially, the bitmap indication may be transmitted by the eNode B to the UE
`via a signaling in the upper layer or in the physical layer. For example, the
`bitmap indication may be transmitted via the Radio Resource Control (RRC)
`signaling semi-statically or implicitly triggered via bits in Downlink Control
`Information (DCI) format dynamically(specific configurations are via RRC
`signaling ).
`
`The bitmap may be used for indicating the sub-table selected from the
`parameter table. It should be noted that the number of the entries in the
`sub-table is the same as in the legacy parameter table, so that the signaling
`overhead related to the indication in the physical layer is kept unchanged.
`
`The bitmap may be generated by the eNode B based on the communication
`scenarios of the wireless communication system as described above typically
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`or any other suitable scenarios.
`
`10
`
`5
`
`10
`
`15
`
`After the eNode B transmits to the UE the bitmap indication, both the eNode B
`and the UE are aware of the sub-table currently in use, so they may
`communicate an index of an entry in the parameter sub-table with each other.
`For example, for the COi table, UE may report the COi index to the eNode B
`based on the sub-table and eNB clearly know the exactly same table where UE
`is referring to. For the MCS table, the eNode B may inform the UE of the MCS
`index and UE assumes the same MCS table as that in eNB.
`
`Moreover, since the extended parameter table comprises more entries than
`the legacy table, the method of the first embodiment of the present disclosure
`may further comprise a re-indexing process and a restoring process, which will
`be described later, to keep the feedback bits unchanged.
`
`Next, a few examples will be given with reference to Figs. 8-10 to better
`explain the principle of bitmap.
`
`First, a description will be made to a case where the bitmap is applied to the
`20 COi table. Fig. 8 is a diagram schematically showing an extended COi table
`and corresponding bitmap examples according to the first embodiment of the
`present disclosure. The COi table as shown in Fig. 8, which may also be
`referred to as the extended COi table, includes 27 entries with indices from
`0-26. Each entry corresponds to a certain COi value with a corresponding
`25 modulation order and coding rate. It should be noted that the values of the
`entries and the number of the entries in the extended COi table are only
`examples, and are not limited thereto.
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`30
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`35
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`Comparing with the legacy COi table as shown in Fig. 1, it can be seen that the
`extended COi table includes the whole entries with indices from 0-15 of the
`legacy COi table, and new extended entries with indices from 16-26. Thus the
`number of the entries in the extended COi table is more than that in the legacy
`COi table.
`
`According to the analysis as described above, for different communication
`scenarios, there is no need to apply the whole extended COi table, and only
`some entries in the extended COi table may be enough in a certain
`communication scenario.
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`For example, for UE at the edge of the cell (e.g. position A as shown in Fig. 4),
`it experiences a low SINR condition, and requires a COi table with relatively
`conservative COi values, i.e. relatively lower effective coding rates and/or
`relatively
`lower modulation orders. The method according
`to
`the
`first
`embodiment of the present disclosure may configure a sub-table
`(a
`conservative COi table in this case) selected from the extended COi table, with
`a bitmap as shown in column 801 of Fig. 8. Exemplarily, the value of "1" in the
`corresponding position of the bitmap may indicate, for example, the existence
`in the
`of the corresponding entry in the sub-table; while the value of
`"O"
`corresponding position of the bitmap may indicate, for example, the absence of
`the corresponding entry in the sub-table; or vice versa. It can be seen from the
`bitmap 801 that entries with lower effective coding rates and modulation orders
`(e.g., OPSK, 160AM and 640AM) are configured in this case.
`
`For UE at a position closer to the middle of the cell than the edge (e.g. position
`Bas shown in Fig. 4), it experiences a medium SINR condition, and requires a
`COi table with relatively medium COi values. The method according to the first
`embodiment of the present disclosure may configure a sub-table (a medium
`COi table in this case) selected from the extended COi table, with a bitmap as
`shown in column 802 of Fig. 8. It can be seen from the bitmap 802 that entries
`with medium effective coding rates and modulation orders are configured in
`this case.
`
`Similarly, for UE at the center of the cell (e.g. position C as shown in Fig. 4), it
`experiences a high SINR condition, and requires a COi table with relatively
`aggressive COi values, i.e. relatively higher effective coding rates and/or
`the first
`relatively higher modulation orders. The method according to
`embodiment of the present disclosure may configure a sub-table (an
`aggressive COi table in this case) selected from the extended COi table, with a
`bitmap as shown in column 803 of Fig. 8. It can be seen from the bitmap 803
`that more entries with higher effective coding rates and modulation orders, for
`example, 2560AM, are configured in this case. Also, a few entries with lower
`effective coding rates and modulation orders (e.g., OPSK) are configured to
`accommodate occasional cases.
`
`It should be noted that the three bitmaps 801-803 are only examples, and
`those skilled in the art can configure the COi table with different bitmaps
`according to the communication scenario.
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`10
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`It should also be noted that, for the extended CQI table, UE should re-order
`(re-index) the entries in the sub-table so that the index length is still the same
`as legacy CQI table. At eNB, it may restore the received index to the original
`index according to the bitmap.
`
`For example, in Fig.8, UE chooses CQI index 20 based on restriction of bitmap
`2. Then, UE may re-index the original entries in the sub-table indicated by the
`bitmap 2, and the original index 20 will be changed to a new index 15 which will
`be feedback to eNB. eNB will restore the index 15 into the original index 20
`based on the bitmap 2. So there is no ambiguity between eNB and UE. eNB
`always knows what kind of table UE is using currently based on the bitmap
`based configuration.
`
`15
`
`Therefore, it can be seen from Fig. 8 that more coding rates and modulation
`orders, for example, 256QAM or higher, are supported by the bitmap, and
`there is a flexibility to select certain coding rates and modulation orders in
`order to adapt different communication scenarios, thus achieving the best
`performance. But at the same time, the restriction is only used for wideband
`20 CQI. For other CQI tpyes like spacial CQI or subband CQI, there is no need to
`restrict that. UE could utilize differential CQI offset level to feedback any entry
`or index in extended CQI table for spacial CQI or subband CQI. The details
`and examples would be introduced later.
`
`25 Moreover, as described above, the bitmap indication may be transmitted by the
`eNode B to the UE via an upper layer signaling, such as the RRC signaling,
`which keeps the signaling overhead in the physical layer unchanged.
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`In addition, the number of entries in the CQI sub-table is 16, which is the same
`as that in the legacy CQI table, so that a good backward compatibility and
`overhead is ensured and only a small modification to the standard is needed.
`
`Next, a description will be made to a case where the bitmap is applied to the
`differential CQI table. Figs. 9a and 9b are diagrams schematically showing two
`kinds of extended differential CQI tables and corresponding bitmap examples
`according to the first embodiment of the present disclosure.
`
`First, referring to Fig. 9a, the extended differential CQI table 901 includes the
`whole entries with indices from 0-3 of the legacy differential CQI table as
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`shown in Fig. 2, and new extended entries with indices from 4-7. Similarly, the
`values of the entries and the number of the entries in the extended differential
`COi table are only examples, and those skilled in the art may design an
`extended differential COi table comprising more or less number of entries with
`different values. The option shown in Fig.9a is direct extension and still keeps
`the legacy entries/values.
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`5
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`10
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`As shown in Fig. 9a, for relatively small offset levels, such as 2dB, the method
`according to the first embodiment may configure a sub-table selected from the
`extended differential COi table, with the bitmap 1 as shown in column 902 of
`Fig. 9a, which indicates the same entries as those in the legacy differential COi
`table. For relatively large offset levels, such as 5 or 6 dB, the method according
`to the first embodiment may configure a sub-table selected from the extended
`differential COi table, with the bitmap 2 as shown in column 903 of Fig. 9a,
`15 which indicates extended entries corresponding to large offset levels.
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`20
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`25
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`35
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`Option in Fig. 9a achieves a good backward compatibility. On the other hand,
`Fig. 9b is a differential COi table completely redefined according to the first
`embodiment of the present disclosure, which includes en