US007369878B2
`
`(12) United States Patent
`US 7,369,878 B2
`(10) Patent No.:
`Doi et al.
`(45) Date of Patent:
`May 6, 2008
`
`(54) RADIO BASE STATION APPARATUS, RADIO
`TERMINAL APPARATUS, MOBILE
`COMMUNICATION SYSTEM, AND
`RECEPTION OPERATION CONTROL
`PROGRAM
`
`(75)
`
`Inventors: Yoshiharu Doi, Gifu (JP); Seigo
`Nakao, Gifu (JP); Takeo Miyata, Gifu
`(JP); Tadayoshi Ito, Gifu (JP)
`
`(73) Assignee: Sanyo Electric Co., Ltd., Osaka (JP)
`
`( * ) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 126 days.
`
`(21) Appl. No.: 11/375,080
`
`(22)
`
`Filed:
`
`Mar. 15, 2006
`
`(65)
`
`Prior Publication Data
`
`US 2006/0160572 A1
`
`Jul. 20, 2006
`
`Related US. Application Data
`
`(62) Division ofapplication No. 10/486,082, filed as appli-
`cation No. PCT/JP02/07883 on Aug. 1, 2002, now
`Pat. No. 7,130,659.
`
`(30)
`
`Foreign Application Priority Data
`
`Aug. 6, 2001
`
`(JP)
`
`............................. 2001-237798
`
`(51)
`
`Int. Cl.
`(2006.01)
`H04Q 7/20
`(52) US. Cl.
`........................ 455/561; 455/25; 455/101;
`455/562.1; 455/272
`(58) Field of Classification Search ..................... None
`See application file for complete search history.
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`5,319,795 A
`
`6/1994 Hamabe et a1.
`
`5,628,052 A
`5,933,782 A
`5,953,325 A
`6,011,962 A
`6,023,607 A
`6,330,459 B1
`
`5/1997 DeSantis et a1.
`8/1999 Nakano et a1.
`9/1999 Willars
`1/2000 Lindenmeier et a1.
`2/2000 Siira
`12/2001 Crichton et a1.
`
`(Continued)
`FOREIGN PATENT DOCUMENTS
`
`EP
`
`1 014 599 A1
`
`6/2000
`
`(Continued)
`OTHER PUBLICATIONS
`
`Chapter 3: MMSE Adaptive Array in “Adaptive Signal Processing
`by Array Antenna” Nobuyoshi Kikuma, Kagaku Gijutsu Shuppan,
`pp. 35-49, no date.
`
`(Continued)
`
`Primary ExamineriErika A. Gary
`(74) Attorney, Agent, or FirmiMcDermott Will & Emery
`LLP
`
`(57)
`
`ABSTRACT
`
`In response to a connection request from a terminal, a base
`station provides a signal indicating a reception operation
`adapted to a transmission operation of the base station to the
`terminal. Based on the indicating signal, the terminal selects
`and performs the optimum reception operation. The terminal
`also provides its own reception operation information in
`advance to the base station. Based on the reception operation
`information, the base station transmits a reception operation
`indication to the terminal. These processes are realized with
`software by a DSP.
`
`4 Claims, 24 Drawing Sheets
`
`
`
`
`
`LCH DATA
`
`
`
` DATA FOR LCH
`
`TERM l NAL
`RECEPTION
`OPERATION
`| ND I CAT I NG
`Bl T
`
`
`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`US 7,369,878 B2
`Page 2
`
`U.S. PATENT DOCUMENTS
`
`6,370,377
`6,522,898
`6,553,078
`6,564,036
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`6,898,441
`7,099,697
`7,130,659
`7,142,888
`2001/0014588
`2001/0023185
`2002/0018530
`2002/0072366
`2002/0077153
`2002/0123371
`2002/0168946
`2002/0193146
`2004/0038713
`2004/0166903
`2004/0214606
`2005/0085266
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`B1
`B1
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`B1
`B2
`B2
`B2
`A1
`A1
`A1
`A1
`A1
`A1
`A1
`A1
`A1
`A1
`A1
`A1
`
`4/2002
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`5/2003
`7/2003
`7/2003
`3/2004
`12/2004
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`8/2006
`10/2006
`11/2006
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`4/2005
`
`Take et al.
`Kohno et al.
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`Kasapi
`Ogawa et al.
`Taguchi
`Chiba et a1.
`Kitakado
`Kogiantis et a1.
`Okawa et al.
`Doi et al.
`Okawa et al.
`Ishida
`Hakkinen et a1.
`Kim et al.
`Take et al.
`Chiba et a1.
`Miyoshi et al.
`Aizawa et al.
`Wallace et a1.
`Okawa et al.
`Nakanishi
`Wichman et al.
`Narita
`
`2006/0067416 A1
`2006/0083195 A1
`2006/0154618 A1
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`
`3/2006
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`
`Trikkonen et a1.
`Forenza et al.
`Doi et al.
`Doi et al.
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`FOREIGN PATENT DOCUMENTS
`
`JP
`JP
`JP
`JP
`JP
`JP
`W0
`W0
`
`2-276323
`11-32030
`P2000-22611 A
`P2000-31874 A
`P2000-216724 A
`P2001-77750 A
`WO 99/59263 A1
`WO 00/79702 A1
`
`11/1990
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`
`OTHER PUBLICATIONS
`
`“A Switching CMNDiversity Antenna for Canceling Echoes with
`Fading in an FM Broadcasting Receiver”, Takuya Otani, et a1.
`B-472, no date.
`Japanese Office Action issued in Japanese Patent Application No.
`JP2000-035971, dated Mar. 30, 2004.
`Suzuki, H., et al., “Path DiVision Multiple Access (PDMA) Mobile
`Radio Communication Systems,” Technical Report of Institute of
`Electronics, Information and Communication Engineers, RCS93-84
`(Jan. 1994), p. 37—44.
`
`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`U.S. Patent
`
`Ma 6 2008
`
`Sheet 1 of 24
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`U.S. Patent
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`May 6, 2008
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`U.S. Patent
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`May 6, 2008
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`Sheet 4 of 24
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`U.S. Patent
`
`May 6, 2008
`
`Sheet 5 of 24
`
`US 7,369,878 B2
`
`FIG. 5
`
`TERMINAL OPERATION
`
`BASE STATION OPERATION
`
`LCH ALLOCATION REOUEST
`
`LCH ALLOCATION INDICATION
`TERMINAL TRANSMISSION/
`RECEPTION METHOD INDICATION
`
`ADAPTIVE ARRAY RECEPTION
`
`TRANSMIT FROM APPROPRIATE
`ANTENNA
`
`UPLINK SYNCHRONOUS BURST
`
`ADAPTIVE ARRAY RECEPTION
`
`DOWNLINK SYNCHRONOUS BURST
`
`ADAPTIVE ARRAY TRANSMISSION
`
`ADAPTIVE ARRAY TRANSMISSION
`
`TRANSMIT FROM
`SPECIFIC ANTENNA
`
`RECEIVE AT
`APPROPRIATE ANTENNA
`
`TRANSMIT FROM
`SPEC|F|c ANTENNA
`
`IINNTINIEISAIRANNSMIIIIIED
`IN PRECEDING FRAME
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`
`THAT HAS TRANSMITTED
`IN PRECEDING FRAME
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`TCH ACTIVATION PROCESS
`
`ADAPTIVE ARRAY RECEPTION
`
`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`U.S. Patent
`
`May 6, 2008
`
`Sheet 6 of 24
`
`US 7,369,878 B2
`
`FIG. 6
`
`TERMINAL OPERATION
`
`BASE STATION OPERATION
`
`TRANSMIT FROM
`SPECIFIC ANTENNA
`
`RECE|VE AT
`APPROPRIATE ANTENNA
`
`TRANSM|T FROM
`SPECIFIC ANTENNA
`
`RECElVE AT
`APPROPRIATE ANTENNA
`
`TRANSMIT FROM
`SPECIFIC ANTENNA
`
`RECEIVE AT ANTENNA
`THAT HAS TRANSMITTED
`IN PRECEDING FRAME
`
`LCH ALLOCATION REQUEST
`
`ADAPTIVE ARRAY RECEPTION
`
`LCH ALLOCATION INDICATION
`
`MIT FROM
`TRANS
`ANTENNA
`
`I T
`APPROPR A E
`
`UPLINK SYNCHRONOUS BURST
`
`ADAPTIVE ARRAY RECEPTION
`
`DOWNLINK SYNCHRONOUS BURST
`TERMINAL TRANSMISSION/
`RECEPTION METHOD INDICATION
`
`ADAPTIVE ARRAY TRANSMISSION
`
`ADAPTIVE ARRAY TRANSMISSION
`
`T VATION PROC
`TCH AC I
`DOWNL'NK TC”
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`S
`
`ES
`
`ADAPTIVE ARRAY RECEPTION
`
`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`U.S. Patent
`
`May 6, 2008
`
`Sheet 7 of 24
`
`US 7,369,878 B2
`
`FIG.
`
`7
`
`TERMINAL OPERATION
`
`BASE STATION OPERATION
`
`ASQNTNIE AfiggNNA
`
`RECEIVE AT
`APPROPRIATE ANTENNA
`
`TRANSMIT FROM
`SPEC|F|c ANTENNA
`
`RECEIVE AT
`APPROPRIATE ANTENNA
`
`TRANSMIT FROM
`SPECIFIC ANTENNA
`RECEIVE AT
`APPROPRIATE ANTENNA
`TRANSMIT FROM
`SPECIFIC ANTENNA
`RECEIVE AT ANTENNA
`THAT HAS TRANSMITTED
`IN PRECEDING FRAME
`
`LCH ALLOCATION REQUEST
`
`ADAPTIVE ARRAY RECEPTION
`
`LCH ALLOCATION INDICATION
`
`TRANSMIT FROM APPROPRIATE
`ANTENNA
`
`ADAPTIVE ARRAY TRANSMISSION
`
`UPLINK SYNCHRONOUS BURST
`
`ADAPTIVE ARRAY RECEPTION
`
`DOWNLINK SYNCHRONOUS BURST
`
`ADAPTIVE ARRAY TRANSMISSION
`
`TCH ACTIVATION PROCESS
`DOWNUNK TCH
`TERMINAL TRANSMISSION/
`RECEPTION METHOD INDICATION
`UPLINK TCH
`DOWNUNK TCH
`
`ADAPTIVE ARRAY RECEPTION
`
`ADAPTIVE ARRAY TRANSMISSION
`
`ADAPTIVE ARRAY RECEPTION
`
`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`U.S. Patent
`
`May 6, 2008
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`U.S. Patent
`
`May 6, 2008
`
`Sheet 9 of 24
`
`US 7,369,878 B2
`
`Intel, Exhibit 1001
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`
`MODULATORCIRCUIT
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`Intel, Exhibit 1001
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`

`

`U.S. Patent
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`May 6, 2008
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`May 6, 2008
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`U.S. Patent
`
`May 6, 2008
`
`Sheet 12 of 24
`
`US 7,369,878 B2
`
`FIG. 12
`
`INDICATE ADAPTIVE ARRAY RECEPTION OPERATION
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`FIG. 13
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`Intel, Exhibit 1001
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`Intel, Exhibit 1001
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`

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`U.S. Patent
`
`May 6, 2008
`
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`U.S. Patent
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`May 6, 2008
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`Intel, Exhibit 1001
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`
`

`

`U.S. Patent
`
`May 6, 2008
`
`Sheet 22 of 24
`
`US 7,369,878 B2
`
`FIG. 24
`
`RECEIVE RECEPT | ON OPERATION
`INDICATING SIGNAL
`
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`SET RECEPTION OPERATION
`
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`F I X RECEPTION ANTENNA
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`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`U.S. Patent
`
`May 6, 2008
`
`Sheet 23 of 24
`
`US 7,369,878 B2
`
`FIG.268
`
`PRIORART FIG.26A
`
`PRIORART
`
`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`U.S. Patent
`
`May 6, 2008
`
`Sheet 24 of 24
`
`US 7,369,878 B2
`
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`Intel, Exhibit 1001
`
`
`

`

`US 7,369,878 B2
`
`1
`RADIO BASE STATION APPARATUS, RADIO
`TERMINAL APPARATUS, MOBILE
`COMMUNICATION SYSTEM, AND
`RECEPTION OPERATION CONTROL
`PROGRAM
`
`RELATED APPLICATION
`
`This application is a divisional of US. application Ser.
`No. 10/486,082, filed on Feb. 6, 2004 now US. Pat. No.
`7,130,659, which is the US. National Phase under 35 U.S.C.
`§ 371 of International Application No. PCT/JP02/07883,
`filed on Aug. 1, 2002, which in turn claims the benefit of
`Japanese Application No. 2001-237798, filed on Aug. 6,
`2001, the disclosures of which Applications are incorporated
`by reference herein.
`
`TECHNICAL FIELD
`
`invention relates to a radio base station
`The present
`apparatus, a radio terminal apparatus, a mobile communi-
`cation system and a reception operation control program
`thereof, and specifically, to a radio base station apparatus
`indicating a reception operation adapted to a transmission
`operation of the radio base station apparatus to a radio
`terminal apparatus in response to connection of the radio
`terminal apparatus, a radio terminal apparatus performing a
`reception operation in response to such an indication, a
`mobile communication system including such a radio base
`station apparatus and a radio terminal apparatus, and a
`reception operation control program for controlling such an
`operation.
`
`BACKGROUND ART
`
`Recently, in a mobile communication system (e.g., Per-
`sonal Handyphone System: hereinafter referred to as PHS)
`that has been developing rapidly, PDMA (Path Division
`Multiple Access) scheme is proposed, in which radio termi-
`nal apparatuses (terminals) of a plurality of users can be
`connected to a radio base station apparatus (base station) in
`a spatial multiplexing manner, by spatially dividing an
`identical time slot of an identical frequency for improving
`the frequency effectiveness of a radio wave.
`In this PDMA scheme, an adaptive array technique is
`currently employed, in which an uplink signal from each
`user’s terminal antenna is received by an array antenna of a
`base station and extracted with reception directivity through
`an adaptive array process. A downlink signal to the terminal
`from the base station is transmitted from the array antenna
`with transmission directivity to the antenna of the terminal.
`Such an adaptive array process is well known in the art
`and described in detail, for example, in “Chapter 3: MMSE
`Adaptive Array” in “Adaptive Signal Processing by Array
`Antenna”, Nobuyoshi Kikuma, Kagaku Gijutsu Shuppan,
`pp. 35-49. Thus, description on its operation principle is not
`given herein. Further, specific arrangement of a radio appa-
`ratus employing the adaptive array processing is well known
`in the art, as disclosed in detail in International Publication
`No. W000/79702 of the present applicant.
`In the following, a base station that performs downlink
`transmission directivity control using such an adaptive array
`process is referred to as an adaptive array base station.
`As for a terminal, one performing selective diversity
`reception (hereinafter referred to as diversity reception)
`using a plurality of antennas is known. In reception, such a
`terminal operates to select one antenna with higher reception
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`level as a reception antenna from, for example, two anten-
`nas. Such a conventional diversity reception terminal per-
`forms the above mentioned diversity reception regardless of
`whether the base station to be connected is an adaptive array
`base station performing transmission directivity control or a
`nondirectional base station.
`
`FIGS. 26A and 26B schematically show the connection
`states between terminals and adaptive array base stations,
`FIG. 26A showing the connection state between terminals
`not performing diversity reception and adaptive array base
`stations, and FIG. 26B showing the connection state
`between terminals performing diversity reception and adap-
`tive array base stations.
`Referring to FIG. 26A, as indicated by a bold arrow, a
`terminal 3 not performing diversity reception is connected to
`a desired adaptive array base station 1, and from an array
`antenna of adaptive array base station 1, a downlink signal
`is transmitted with transmission directivity to one antenna of
`terminal 3 that has transmitted an uplink signal. A hatched
`region D (D: Desired) indicates a state where a beam of
`signal wave is directed to terminal 3 from adaptive array
`base station 1.
`
`In this case, terminal 3 can receive the downlink signal
`from adaptive array base station 1 at the maximum power
`due to the transmission directivity of desired adaptive array
`base station 1. The relationship between a terminal 4 not
`performing diversity reception and its desired adaptive array
`base station 2 is the same.
`
`Though the signal wave from adaptive array base station
`2 as indicated by a broken arrow U (U: Undesired) functions
`as an interference wave for terminal 3, as can be seen from
`the emission state of the signal wave in FIG. 26A, the signal
`power of the interference wave from adaptive array base
`station 2 received at terminal 3 is of the minimum. The
`
`relationship between terminal 4 not performing diversity
`reception and its non-desired adaptive array base station 1 is
`the same.
`As above, an excellent connection state with less inter-
`ference can be realized between a terminal not performing
`diversity reception and a desired adaptive array base station.
`On the other hand, referring to FIG. 26B, for example a
`terminal 5 performing diversity reception transmits an
`uplink signal from one antenna 511, establishing a connection
`relationship with adaptive array base station 1 as indicated
`by a bold arrow, similarly to the relationship shown in FIG.
`26A. Hence, at antenna 5a of terminal 5, a downlink signal
`from desired adaptive array base station 1 is received at the
`maximum power, while a transmission signal from a non-
`desired adaptive array base station 2 (an interference wave)
`indicated by a broken (fine) arrow is received at the mini-
`mum power.
`Since beam of signal wave D from desired adaptive array
`base station 1 is not directed to the other antenna 5b of
`
`terminal 5 not transmitting an uplink signal, the power of
`reception signal
`from adaptive array base station 1
`decreases. Therefore, the power of interference wave U from
`non-desired adaptive array base station 2 indicated by a
`broken (bold) arrow relatively increases at antenna 5b.
`The similar state occurs at antennas 6a and 6b of a
`
`terminal 6 performing diversity reception in the relationship
`with adaptive array base stations 1 and 2.
`The similar problem arises in a spatial multiplexing base
`station realizing spatial multiple connection using such an
`adaptive array process. FIGS. 27A and 27B schematically
`indicate the connection states between terminals and base
`
`stations, FIG. 27A showing connection state between ter-
`minals not performing diversity reception and a spatial
`
`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`US 7,369,878 B2
`
`3
`multiplexing base station, FIG. 27B showing connection
`state between terminals performing diversity reception and
`a spatial multiplexing base station.
`Referring to FIG. 27A, as indicated by a bold arrow,
`terminals 30 and 40 not performing diversity reception are
`connected in spatial multiplexing manner to a desired base
`station 10 through the adaptive array process, and from an
`array antenna of spatial multiplexing base station 10, a
`downlink signal is transmitted with transmission directivity
`to one antenna of each of terminals 30 and 40 that has
`
`transmitted an uplink signal. A hatched region D indicates a
`state where a beam of signal wave is directed to each of
`terminals 30 and 40 from spatial multiplexing base station
`10.
`
`In this case, terminals 30 and 40 each can receive the
`downlink signal from base station 10 at the maximum power
`due to the transmission directivity of the desired base station
`10.
`
`As above, an excellent connection state with less inter-
`ference can be realized between a terminal not performing
`diversity reception and a desired spatial multiplexing base
`station.
`
`On the other hand, referring to FIG. 27B, for example a
`terminal 50 performing diversity reception transmits an
`uplink signal from one antenna 5011, establishing a connec-
`tion relationship with spatial multiplexing base station 10 as
`indicated by a bold arrow, similarly to the relationship
`shown in FIG. 27A. Hence, at antenna 50a of terminal 50,
`a downlink signal from desired spatial multiplexing base
`station 10 is received at the maximum power.
`Since beam of signal wave D from desired spatial mul-
`tiplexing base station 10 is not directed to the other antenna
`50b of terminal 50 not transmitting an uplink signal, the
`power of reception signal U from spatial multiplexing base
`station 10 decreases. Therefore, the power of interference
`wave from a non-desired base station that is not shown
`
`relatively increases at antenna 50b.
`The similar state occurs for antennas 60a and 60b of a
`
`terminal 60 performing diversity reception.
`As above, at a terminal performing diversity reception,
`regardless of whether a desired base station is an adaptive
`array base station controlling downlink transmission direc-
`tivity, one antenna with higher reception level is selected
`from two antennas as a reception antenna. Therefore, for
`example in a terminal 5 of FIG. 26B, when a combined
`power of a low reception power from desired adaptive array
`base station 1 and a large interference wave U from non-
`desired adaptive array base station 2 received at antenna 5b
`not
`transmitting an uplink signal exceeds the reception
`power from a desired adaptive array base station 1 received
`at antenna 5a that has transmitted an uplink signal, antenna
`5b is selected as a reception antenna.
`In this case, the signal received at antenna 5b has a large
`power of interference wave U from non-desired adaptive
`array base station 2 relative to the downlink reception signal
`from desired adaptive array base station 1, and hence it is a
`signal with a large interference component, i.e., a signal with
`low so-called DU ratio (Desired user’s power: Undesired
`user’s power).
`Even when an attempt is made to demodulate such a
`reception signal with low DU ratio at terminal 5, an error
`occurs in a frame of a demodulation signal and a correct
`demodulation fails. In special, when the power level of a
`downlink signal (interference wave) U from non-desired
`adaptive array base station 2 increases, in the worst case,
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`terminal 5 may inappropriately demodulate a downlink
`signal that is transmitted to another user’s terminal 6 from
`adaptive array base station 2.
`Similar problem arises in the spatial multiplexing base
`stations shown in FIGS. 27A and 27B.
`
`Thus, in the conventional mobile communication system,
`when a terminal that performs diversity reception is con-
`nected to an adaptive array base station (or a spatial multi-
`plexing base station), the DU ratio at the terminal decreases,
`and its reception performance is degraded by an interference
`wave. Accordingly, there exist a problem that the effect of
`the adaptive array technique to reduce the frequency reuse
`distance (the minimum distance between base stations that
`can share the same frequency) is reduced.
`It is noted that, as a terminal of a mobile communication
`system, in addition to the above-mentioned diversity termi-
`nal, there is a terminal of the type that performs transmission
`and reception with one antenna. Further, a terminal that is
`capable of performing adaptive array reception is possible.
`As for a base station, in addition to the base station that
`controls the downlink transmission directivity such as the
`above-mentioned adaptive array base station, there is also a
`nondirectional base station that does not perform such a
`directivity control.
`In such a mobile communication system, it is necessary to
`cause the terminal to perform the reception operation that is
`adapted to a transmission operation of the base station as
`much as possible, and the examples in FIGS. 26A-27B only
`illustrate the cases where the reception operation of the
`terminal is not adapted to the transmission operation of the
`base station.
`
`Therefore, an object of the present invention is to provide
`a radio base station apparatus, a radio terminal apparatus, a
`mobile communication system, and a reception operation
`control program thereof, which are capable of causing the
`terminal
`to perform a reception operation adapted to a
`transmission operation of the base station as much as
`possible.
`Another object of the present invention is to provide a
`radio base station apparatus, a radio terminal apparatus, a
`mobile communication system, and a reception operation
`control program thereof, in which the reception performance
`of the terminal is not degraded even when the terminal is
`connected to the base station that controls downlink trans-
`
`mission directivity, such as an adaptive array base station or
`a spatial multiplexing base station.
`
`DISCLOSURE OF THE INVENTION
`
`One aspect of the present invention is a radio base station
`apparatus to which a radio terminal apparatus can connect,
`including:
`reception means for accepting a connection
`request from the radio terminal apparatus; and transmission
`means for transmitting to the radio terminal apparatus a
`signal indicating a reception operation adapted to a trans-
`mission operation of the radio base station apparatus in
`response to the connection request.
`Preferably, the radio base station apparatus performs a
`transmission operation with transmission directivity to the
`radio terminal apparatus, and the transmission means trans-
`mit a signal indicating an adaptive array reception operation
`to the radio terminal apparatus.
`Preferably, the radio base station apparatus performs a
`transmission operation without transmission directivity to
`the radio terminal apparatus, and the transmission means
`transmit a signal indicating a diversity reception operation to
`the radio terminal apparatus.
`
`Intel, Exhibit 1001
`
`Intel, Exhibit 1001
`
`

`

`US 7,369,878 B2
`
`5
`Another aspect of the present invention is a radio terminal
`apparatus that can connect to a radio base station apparatus,
`wherein the radio base station apparatus includes transmis-
`sion means for transmitting to the radio terminal apparatus
`a signal
`indicating a reception operation adapted to the
`transmission operation of the radio base station apparatus in
`response to a connection request from the radio terminal
`apparatus. The radio terminal apparatus includes means for
`performing a connection request to the radio base station
`apparatus to connect to, means for receiving a signal indi-
`cating the reception operation transmitted from the radio
`base station apparatus in response to the connection request,
`means for determining whether the reception operation
`indicated by the received signal is possible to be performed
`or not, and reception operation control means for performing
`the indicated reception operation when the indicated recep-
`tion operation is determined possible to be performed, and
`for performing a prescribed reception operation when the
`indicated reception operation is determined impossible to be
`performed.
`Preferably, the radio base station apparatus to be con-
`nected performs a transmission operation with transmission
`directivity to the radio terminal apparatus, and the transmis-
`sion means transmit a signal indicating an adaptive array
`reception operation to the radio terminal apparatus.
`Preferably, the radio terminal apparatus is a radio terminal
`apparatus performing transmission and reception with one
`antenna, and the reception operation control means perform
`a reception operation with the one antenna in response to the
`signal indicating the adaptive array reception operation.
`Preferably, the radio terminal apparatus is a radio terminal
`apparatus that can perform diversity reception with a plu-
`rality of antennas, and the reception operation control means
`perform a reception operation in which an antenna used for
`a signal transmission to the radio base station apparatus
`among the plurality of antennas is used for an immediately
`following reception operation from the radio base station
`apparatus in response to the signal indicating the adaptive
`array reception operation.
`Preferably, the radio terminal apparatus is a radio terminal
`apparatus that can perform the adaptive array reception with
`a plurality of antennas, and the reception operation control
`means perform the adaptive array reception operation in
`response to the signal indicating the adaptive array reception
`operation.
`Preferably, the radio base station apparatus to be con-
`nected performs a transmission operation without transmis-
`sion directivity to the radio terminal apparatus, and the
`transmission means transmit a signal indicating a diversity
`reception operation to the radio terminal apparatus.
`Preferably, the radio terminal apparatus is a radio terminal
`apparatus performing transmission and reception with one
`antenna, and the reception operation control means perform
`a reception operation with the one antenna in response to the
`signal indicating the diversity reception operation.
`Preferably, the radio terminal apparatus is a radio terminal
`apparatus that can perform diversity reception with a plu-
`rality of antennas, and the reception operation control means
`perform the diversity reception operation in response to the
`signal indicating the diversity reception operation.
`Preferably, the radio terminal apparatus is a radio terminal
`apparatus that can perform adaptive array reception with a
`plurality of antennas, and the reception operation control
`means perform the diversity reception operation in response
`to the signal indicating the diversity reception operation.
`Preferably, the prescribed reception operation that is per-
`formed when the indicated reception operation is determined
`
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`impossible to be performed is a reception operation in which
`an antenna used for a signal transmission to the radio base
`station apparatus among the plurality of antennas is used for
`an immediately following reception operation from the radio
`base station apparatus.
`Preferably, the prescribed reception operation that is per-
`formed when the indicated reception operation is determined
`impossible to be performed is the adaptive array reception
`operation.
`Still another aspect of the present invention is a mobile
`communication system including a radio base station appa-
`ratus and a radio terminal apparatus. The radio base station
`apparatus includes reception means for accepting a connec-
`tion request from the radio terminal apparatus, and trans-
`mission means for transmitting to the radio terminal appa-
`ratus a signal indicating a reception operation adapted to a
`transmission operation of the radio base station apparatus in
`response to the connection request. The radio terminal
`apparatus includes means for performing a connection
`request to the radio base station apparatus to connect to,
`means for receiving a signal indicating the reception opera-
`tion transmitted from the radio base station apparatus in
`response to the connection request, means for determining
`whether the reception operation indicated by the received
`signal is possible to be performed or not, and reception
`operation control means for performing the indicated recep-
`tion operation when the indicated reception operation is
`determined possible to be performed, and for performing a
`prescribed reception operation when the indicated reception
`operation is determined impossible to be performed.
`Preferably, the radio base station apparatus to be con-
`nected performs a transmission operation with transmission
`directivity to the radio terminal apparatus, and the transmis-
`sion means transmit to the radio terminal apparatus a signal
`indicating an adaptive array