PCT
`INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`WO 99/59263
`
`WORLD INTELLECTUAL PROPERTY ORGANIZATION
`International Bureau
`
`(51) International Patent Classification 6 :
`H04B 7/06
`
`(11) International Publication Number:
`
`Al
`
`(43) International Publication Date:
`
`18 November 1999 (18.11.99)
`
`(21) International Application Number:
`
`PCT/KR99/00238
`
`(22) International Filing Date:
`
`13 May 1999 (13.05.99)
`
`(81) Designated States: AU, BR, CA, CN, JP, RU, European patent
`(AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT,
`LU, MC, NL, PT, SE).
`
`(30) Priority Data:
`1998/17278
`1998/28982
`
`13 May 1998 (13.05.98)
`14 July 1998 (14.07.98)
`
`KR
`KR
`
`Published
`With international search report.
`
`(71) Applicant: SAMSUNG ELECTRONICS CO., LTD. [KR/KR];
`416, Maetan--dong, Paldal-gu, Suwon-shi, Kyungki-do
`442-370 (KR).
`
`265-20, Sokchon-dong,
`PARK JIN, Soo;
`(72) Inventors:
`Songpa-gu, Seoul 137-044 (KR).
`PARK, Su, Won;
`1662-9, Shillim 8-dong, Kwanak-gu, Seoul 151-018
`(KR). YOON, Soon, Young; 165, Karak-dong, Songpa-gu,
`Seoul 138-160 (KR). AHN, Jae, Min; Puleun Samho Apt.
`#109-303, Irwonpon-dong, Kangnam-gu, Seoul 135-239
`(KR).
`
`(74) Agent: LEE, Keen, Joo; Mihwa Building, 110-2, Myon(cid:173)
`gryun-dong, 4-ga, Chongro-gu, Seoul 110-524 (KR).
`
`(54) Title: TIME-SWITCHED TRANSMISSION DIVERSITY (TSTD) DEVICE AND CONTROLLING METHOD THEREOF IN
`MOBILE COMMUNICATION SYSTEM
`
`TSTD BS
`
`START
`
`(57) Abstract
`
`There is provided a transmission diversity
`controlling method in a mobile communication
`system including a base station which transmits
`forward common and dedicated channel data
`through at least two antennas with transmission
`diversity.
`The base station sends a message
`indicating a TSTD (Tune-Switched Transmission
`Diversity)/non TSTD transmission mode through
`an antenna to a plurality of mobile stations in
`the coverage area of the base station. Then, each
`mobile station analyses
`the message received
`from the base station and sets its reception mode
`to a TSTD/non-TSTD mode according to the
`transmission mode.
`
`618
`
`Intel, Exhibit 1003
`
`

`

`FOR THE PURPOSES OF INFORMATION ONLY
`
`Codes used to identify States party to the PCT on the front pages of pamphlets publishing international applications under the PCT.
`
`AL
`AM
`AT
`AU
`AZ
`BA
`BB
`BE
`BF
`BG
`BJ
`BR
`BY
`CA
`CF
`CG
`CH
`Cl
`CM
`CN
`cu
`CZ
`DE
`DK
`EE
`
`Albania
`Annenia
`Austria
`Australia
`Azerbaijan
`Bosnia and Herzegovina
`Barbados
`Belgium
`Burkina Faso
`Bulgaria
`Benin
`Brazil
`Belarus
`Canada
`Central African Republic
`Congo
`Switzerland
`Cl\te d'Ivoire
`Cameroon
`China
`Cuba
`Czech Republic
`Gennany
`Denmark
`Estonia
`
`ES
`Fl
`FR
`GA
`GB
`GE
`GH
`GN
`GR
`HU
`IE
`IL
`IS
`IT
`JP
`KE
`KG
`KP
`
`KR
`KZ
`LC
`LI
`LK
`LR
`
`Spain
`Finland
`France
`Gabon
`United Kingdom
`Georgia
`Ghana
`Guinea
`Greece
`Hungary
`Ireland
`Israel
`Iceland
`Italy
`Japan
`Kenya
`Kyrgyzstan
`Democratic People's
`Republic of Korea
`Republic of Korea
`Kazakstan
`Saint Lucia
`Liechtenstein
`Sri Lanka
`Liberia
`
`LS
`LT
`LU
`LV
`MC
`MD
`MG
`MK
`
`ML
`MN
`MR
`MW
`MX
`NE
`NL
`NO
`NZ
`PL
`PT
`RO
`RU
`SD
`SE
`SG
`
`Lesotho
`Lithuania
`Luxembourg
`Latvia
`Monaco
`Republic of Moldova
`Madagascar
`The fonner Yugoslav
`Republic of Macedonia
`Mali
`Mongolia
`Mauritania
`Malawi
`Mexico
`Niger
`Netherlands
`Norway
`New Zealand
`Poland
`Portugal
`Romania
`Russian Federation
`Sudan
`Sweden
`Singapore
`
`SI
`SK
`SN
`sz
`TD
`TG
`TJ
`TM
`TR
`TT
`UA
`UG
`us
`uz
`VN
`YU
`zw
`
`Slovenia
`Slovakia
`Senegal
`Swaziland
`Chad
`Togo
`Tajikistan
`Turkmenistan
`Turkey
`Trinidad and Tobago
`Ukraine
`Uganda
`United States of America
`Uzbekistan
`Viet Nam
`Yugoslavia
`Zimbabwe
`
`Intel, Exhibit 1003
`
`

`

`W099/59263
`
`PCT /KR99/00238
`
`TIME-SWITCHED TRANSMISSION DIVERSITY (TSTD} DEVICE
`
`AND CONTROLLING METHOD THEREOF
`
`5
`
`IN MOBILE COMMUNICATION SYSTEM
`
`BACKGROUND OF THE INVENTION
`
`1. Field of the Invention
`
`The present invention relates generally to the field of communication
`
`systems, and particularly to a transmitting/receiving device with a time-switched
`
`1 O transmission diversity function and a controlling method thereof in a mobile
`
`communication system.(For better understanding of the present invention, see
`
`Korea Application No. 1998-5526, Korea Application No. 1998-17277, and
`
`Korea Application No. 1998-17280)
`
`2. Description of the Related Art
`
`15
`
`A base station (BS) and a mobile station (MS) communicate data with
`
`each other through their single antennas in most mobile communication systems.
`
`When a signal-fading phenomenon occurs, a plurality of data groups are
`
`damaged, resulting in a serious degradation of communication quality. This
`
`problem can be solved by use of a transmission diversity scheme in which data is
`
`2 o transmitted through at least two transmission antennas. That is, the transmission
`
`diversity scheme can increase data transmission/reception performance in a
`
`mobile communication system under a signal fading environment.
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`- 2
`
`-
`
`In addition to using a transmission diversity scheme, a reception diversity
`
`scheme can be utilized on the reverse link by installing a plurality of reception
`
`antennas in a BS so that the BS can receive a signal from an MS on a reverse
`
`link with good reception performance. On a forward link, the BS can transmit a
`
`s signal to the MS through multiple antennas. For communication with the BS, the
`
`MS may employ one of these approaches; a transmission diversity scheme using
`
`a plurality of transmission antennas with a single reception antenna, a reception
`
`diversity scheme requiring a plurality of reception antennas, or a combination of
`
`the transmission and reception diversity schemes.
`
`1 o
`
`Reception diversity on the forward link, however, is not viable because
`
`the mobile terminal is small. That is, using a plurality of reception antennas for
`
`the mobile terminal results in a small diversity gain due to the limited distance
`
`between antennas. Furthermore, the mobile terminal should be equipped with
`
`separately procured devices for receiving forward link signals and transmitting
`
`15 reverse link signals through corresponding antennas. Therefore, for the reasons
`
`stated, the reception diversity scheme is disadvantageous in terms of the size and
`
`cost of the mobile terminal. Therefore, the transmission diversity scheme is
`
`generally used for the forward link in a base station.
`
`SUMMARY OF THE INVENTION
`
`2 o
`
`The method of the present invention is generally referred to as time
`
`switched transmission diversity (TSTD) and is applied to signal transmissions on
`
`a forward link from a BS to an MS in a CDMA (Code Division Multiple Access)
`
`mobile communication system. The TSTD scheme increases transmission
`
`efficiency by transmitting signals through at least two antennas which are
`
`2 s alternately switched in the BS. Since a TSTD transmitting/receiving device
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`-
`
`3
`
`-
`
`increases device complexity as well as performance in comparison with a
`
`conventional single-antenna transmitting/receiving device, it is expected that the
`
`inventive TSTD device and a non-TSTD (i.e., prior art) device will coexist.
`
`Therefore, to ensure reliable TS TD transmission/reception, a BS and an MS
`
`s should support a TSTD mode, and have controllers and controlling procedures
`
`for determining whether to use the TSTD mode prior to transmission/reception
`
`of user data and signalling data on a dedicated channel. The controlling
`
`procedures are necessary to allow a non-TSTD MS to compatibly communicate
`
`with a TSTD BS.
`
`1 o
`
`For a BS to transmit modulated data in a TSTD mode through at least two
`
`antennas and for an MS to receive the TSTD data from the BS, their operational
`
`modes should be set up. For proper operation, if the BS is to transmit data in the
`
`TSTD mode, the MS detects the transmission mode of the BS by analysing a
`
`message received from the BS and sets its reception mode to a TSTD or non-
`
`15 TSTD mode according to the detected transmission mode, for data reception.
`
`It is therefore an object of the present invention to provide a device for
`
`communicating data between a BS and an MS which support TSTD as an
`
`optional or requisite function and a controlling method thereof.
`
`Another object of the present invention is to provide a device for setting
`
`2 o transmission/reception modes of a BS and an MS which support TSTD as an
`
`optional or requisite function and a controlling method thereof.
`
`A further object of the present invention is to provide a device and
`
`method of estimating the channel status of TSTD signals received from a TS TD
`
`BS through a plurality of transmit antennas.
`
`Intel, Exhibit 1003
`
`

`

`W099/59263
`
`PCT /KR99/00238
`
`- 4
`
`-
`
`A still further object of the present invention is to provide a method of
`
`setting a TSTD mode between a BS and an MS which support TSTD as an
`
`optional or requisite function.
`
`Still another object of the present invention is to provide a method of
`
`5 operating forward common and dedicated channels between a BS and an MS
`
`which are support TSTD as an optional function in a mobile communication
`
`system.
`
`A yet another object of the present invention is to provide a device and
`
`method for operating forward common and dedicated channels in the case where
`
`1 o BSs and MSs which support TSTD as an optional or requisite function coexist
`
`with Bss and MSs which do not support TSTD in a mobile communication
`
`system.
`
`To achieve the above objects, there is provided a transmission diversity
`
`15 controlling method in a mobile communication system including a base station
`
`which transmits forward common and dedicated channel data through at least
`
`two antennas with transmission diversity. The base station sends a message
`
`indicating a TSTD/non-TSTD transmission mode through an antenna to a
`
`plurality of mobile stations in the coverage area of the base station. Then, each
`
`2 o mobile station analyses the message received from the base station and sets its
`
`reception mode to a TSTD/non-TSTD mode according to the transmission mode.
`
`BRIEF DESCRIPTION OF THE ORA WINGS
`
`The above objects and advantages of the present invention will become
`
`more apparent by describing in detail a preferred embodiment thereof with
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`- 5
`
`-
`
`reference to the attached drawings in which:
`
`FIGs. IA, IB and IC is an illustration describing a TSTD operation in a
`
`mobile communication system according to an embodiment of the present
`
`invention;
`
`s
`
`FIG. 2 is a block diagram of a TSTD device which is a component of a
`
`BS and an MS in a mobile communication system utilizing TSTD methods
`
`according to an embodiment of the present invention;
`
`FIG. 3 is a block diagram of a TSTD transmitter in the BS for transmitting
`
`signals through two antennas according to an embodiment of the present
`
`1 o invention;
`
`FIG. 4 is a block diagram of a TSTD receiver in the MS for receiving a
`
`TS TD signal according to an embodiment of the present invention;
`
`FIG. 5 illustrates the exchange of messages for controlling a TSTD mode
`
`between the BS and the MS according to an embodiment of the present
`
`15 invention;
`
`FIG. 6 is a flowchart of an MS operation for setting a reception mode by
`
`exchanging messages with the MS and receiving traffic channel data;
`
`FIG. 7 is a flowchart of a BS operation for setting a transmission mode by
`
`exchanging messages with the MS and transmitting traffic channel data;
`
`2 o
`
`FIG. 8A illustrates the format of a broadcast message sent to a plurality of
`
`MSs by a BS;
`
`FIG. SB illustrates the format of an access message sent to a BS by an
`
`MS; and
`
`FIG. 8C illustrates the format of a common control channel (CCCH)
`
`2 5 message sent to an MS by a BS.
`
`DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`- 6
`
`-
`
`A preferred embodiment of the present invention will be described in
`
`detail with reference to the attached drawings. It is to be noted that a detailed
`
`description of a known function or structure of the present invention will be
`
`omitted if it is deemed to obscure the subject matter of the present invention.
`
`5
`
`A detailed description of transmission and reception control message
`
`processes for a BS transmitter and an MS receiver to transmit and receive TSTD
`
`traffic channel data will be provided.
`
`It should be appreciated with respect to the following description that a
`
`f01ward common channel ( e.g., common control channel and common traffic
`
`1 o channel) is a channel which can be received by all MSs in a cell, and a forward
`
`dedicated channel (e.g., dedicated control channel and dedicated traffic channel)
`
`is a channel which can be received by only one specific MS.
`
`The present invention is intended to provide a TSTD device and method
`
`in a mobile communication system in which a BS selects one of at least two
`
`15 transmission antennas in time switching to send a common and/or dedicated
`
`channel signal according to a switching pattern control signal and an MS
`
`receives the TS TD signal.
`
`The present invention is also directed to the operation of the forward
`
`c01mnon and dedicated channels when a mobile communication system supports
`
`2 o the TSTD function as optional or requisite.
`
`If TSTD is supported as a requisite function, all BSs and MSs in the
`
`system can c01mnmucate data with TSTD. Hence, TSTD can be applied to the
`
`fotward common and dedicated channels. More specifically, TSTD is
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`-
`
`7
`
`-
`
`necessarily applied to the forward c01mnon channels, and flexibly applied to the
`
`f mward dedicated channels. The forward dedicated channels are c01mnunicated
`
`in a TSTD mode in a normal state but in a non-TS TD mode during a handoff or
`
`according to the status of a BS or an MS.
`
`5
`
`If TSTD is supported as an optional function, TSTD BSs and MSs may
`
`coexist with non-TSTD BSs and MSs in the system. In this case, TSTD can be
`
`applied to the forward common and dedicated channels in many ways. Since the
`
`f mward common channel is shared by all MSs in a cell, an MS should be
`
`capable of receiving a TSTD signal from a BS if the next generation mobile
`
`1 o cmmnunication standard provides that the BS should support the TSTD fiinction.
`
`In the case of the forward dedicated channel, TSTD is applied if both a BS and
`
`an MS can support TSTD and is released when the BS or the MS considers non(cid:173)
`
`TSTD mode communication necessary as in a handoff. If at least one of the BS
`
`and the MS does not support the TSTD function, TSTD cannot be applied to the
`
`15 fmward dedicated channel.
`
`A description of operation of the f01ward common and dedicated channels
`
`between a BS having the TSTD function as optional and an MS having the
`
`TSTD function as requisite will precede a description of operation of the forward
`
`c01mnon and dedicated channels between a BS and an MS which have the TSTD
`
`2 o function as requisite. Since reception of a TSTD signal from a BS indicates
`
`reception of signals from different paths according to a TSTD transmission
`
`pattern of the BS, it is preferable to set a reception pattern to be the same as the
`
`transmission pattern and estimate a channel.
`
`FIGs. IA and IB describe a TSTD operation in a mobile communication
`
`25 system having TSTD as an optional function according to an embodiment of the
`
`Intel, Exhibit 1003
`
`

`

`W099/59263
`
`PCT /KR99/00238
`
`- 8 -
`
`present invention. FIG. lA illustrates channel support/non-support for the
`
`situation where the BS supports TSTD, and FIG. IB illustrates channel
`
`support/non-support for the situation where the BS does not support TSTD.
`
`FI Gs. lA and lB show that application of TSTD to forward channels including a
`
`s BCCH (Broadcast Control Channel), a CCCH (Common Control Channel), and
`
`a TCH (Traffic Channel) depends upon whether a BS and an MS support TSTD
`
`or not. Shaded blocks indicate those channels which support TSTD. For
`
`example, referring to FIG. lA, it is shown that the TCH channel supports when
`
`both the BS and MS support TSTD.
`
`1 o
`
`The forward channels, briefly described above, are defmed as follows.
`
`BCCH is a common channel on which a BS broadcasts the same information to a
`
`plurality of MSs, the CCCH is a common channel on which a BS sends a
`
`specific MS a paging message, a channel assignment message, and the like, and
`
`the TCH is a dedicated channel on which a BS sends a specific MS user
`
`15 information or signalling information. An RACH (Random Access Channel) (not
`
`shown) is a reverse access channel on which an MS transmits data to a BS.
`
`In the case where TSTD BSs and MSs coexist with non-TS TD BSs and
`
`MSs, the transmission mode of each transmission channel (i.e., BCCH, CCCH,
`
`TCH) for a BS is set according to the operational modes of the BS and an MS, as
`
`2 o described in Table 1:
`
`(1) when both the BS and the MS support TSTD, TSTD is applied to a
`
`f mward BCCH. Though TS TD is basically not applied to other cmmnon control
`
`channels, it can be applied to them during a time period assigned to an MS in a
`
`limited way when necessary in the system. TSTD is selectively applied to the
`
`2 5 fo1ward dedicated cham1el.
`
`Intel, Exhibit 1003
`
`

`

`W099/59263
`
`PCT /KR99/00238
`
`- 9 -
`
`(2) when only the BS can support TSTD, TSTD is not applied to all
`
`fotward channels.
`
`(3) when only the MS can support TSTD, TSTD is not applied to all
`
`fotward channels.
`
`5
`
`(4) when either of the BS and MS cannot support TSTD, TSTD is not
`
`applied to all forward channels.
`
`First Embodiment: BS and MS Support TSTD
`
`In accordance with one embodiment of the present invention where both
`
`the BS and MS support TSTD (See FIG. IA, LHS). TSTD is applied to forward
`
`10 channels only if both the BS and the MS support TSTD in a mobile
`
`c01mnunication system having TSTD as an optional function.
`
`Though the forward BCCH is directed to unspecific MSs in a cell, if all
`
`conesponding MSs can receive a TSTD signal, it is preferable that the BS
`
`transmit the forward BCCH in TSTD. The forward CCCH, received by a
`
`15 plmality of MSs, is considered a channel temporarily designated as dedicated for
`
`transmission of data to a specific MS dming a predetermined time period.
`
`Therefore, TS TD is selectively applied to the forward CCCH.
`
`A TSTD device for controlling a TSTD operation in a mobile
`
`communication system must be incorporated as additional hardware in both a BS
`
`2 o 10 and an MS 12 in FIG. 2.
`
`Refening to FIG. 2, the BS 10 is comprised of a BS transmitter 14 for
`
`sending a broadcast message, a paging message, and traffic data (voice, data, and
`
`signalling) on a BCCH, a CCCH, and a TCH, upon receipt of a control signal
`
`from a BS controller, a BS receiver 16 for receiving a message from the MS 12
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT/KR99/00238
`
`- 10 -
`
`on an RACH, and a BS controller 18 for transmitting/receiving signals to/from
`
`the BS transmitter 14 and the BS receiver 16 and for controlling the operation of
`
`the BS 10.
`
`The MS 12 includes an MS receiver 20 for receiving data from the BS
`
`5
`
`transmitter 14 on the BCCH, CCCH, and TCH, an MS transmitter 22 for sending
`
`data to the BS receiver 16 on the RACH, and an MS controller 24 for
`
`communicating data with the MS receiver 20 and the MS transmitter 22 and
`
`controlling data communication with the BS 10.
`
`A TCH transmitter (not shown) located in the BS transmitter 14 is
`
`10 configured to implement transmission diversity, by way of example. TSTD can
`
`be applied to other channels under the condition that such a mutual agreement as
`
`provided in the communication standard is set between the BS and the MS. A
`
`TCH receiver (not shown) in the MS receiver 20 receives a data signal which
`
`was sent in a TSTD mode by the BS through a plurality of antennas. The BS
`
`15 controller 18 controls the BS transmitter 14 to send the MS 12 a message on the
`
`BCCH, notifying the MS whether the TSTD made is being supported in the BS.
`
`Then, the MS 12 sets its reception mode by analysing the BCCH message
`
`received from the BS 10. For example, if the transmission mode is TSTD, the
`
`MS 12 also sets its reception mode to TSTD, and if the transmission mode is
`
`2 o non-TS TD, the MS 12 also sets its reception mode to non-TS TD. When
`
`necessa1y, the MS 12 may send the BS 10 a message on the RACH, notifying
`
`whether the MS 12 supports a TSTD mode or not.
`
`Message Exchange Between BS and MS
`
`The message exchange procedure will be described with reference to the
`
`25 first embodiment (Table 1, row 1) where the BS 10 and the MS 12 both support
`
`Intel, Exhibit 1003
`
`

`

`W099/59263
`
`PCT /KR99/00238
`
`- 11 -
`
`TSTD. Referring to Table 1, TSTD can be applied to the forward TCH cinly in
`
`the situation where both the BS 10 and the MS 12 support TSTD.
`
`In operation, the BS controller 18 sends the BS transmitter 14 BS
`
`transmission mode information. For example, it sends the BS transmitter 14
`
`5 control data including transmission mode information indicating whether the
`
`BCCH transmitter supports a TSTD mode or not, and if the TSTD mode is
`
`supported a TSTD pattern is additionally sent by the controller. The BS
`
`transmitter 14 sends the MS 12 the control data on the BCCH under the control
`
`of the BS controller 18.
`
`1 o
`
`The MS receiver 20 analyses the transmission mode information received
`
`from the BS 10 on the BCCH. The MS controller 24 analyzes the transmission
`
`mode information and sends the MS transmitter 22 reception mode information ..
`
`The MS transmitter 22 sends the BS IO the MS reception mode information on
`
`the RACH. The BS receiver 16 sends the BS controller 18 the MS reception
`
`15 mode information received on the RACH, and the BS controller 18 generates a
`
`control signal based on both the BS transmission mode information and the MS
`
`reception mode information to control the operation of the BS transmitter 14 as
`
`shown in FIGs. IA and IB.
`
`Meanwhile, the MS controller 24 generates a control signal based on both
`
`2 o the MS reception mode information and the BS transmission mode information
`
`to control the operation of the MS receiver 20. The BS transmitter 14 sends the
`
`MS receiver 20 a message for setting a TCH on the CCCH prior to designation
`
`of the TCH. Upon designation of the TCH, the BS transmitter 14 sends the MS
`
`receiver 20, user or signalling information on the TCH in a selected transmission
`
`25 mode.
`
`Intel, Exhibit 1003
`
`

`

`W099/59263
`
`PCT /KR99/00238
`
`- 12 -
`
`The following description will further assist in understanding the
`
`operation of determining a transmission/reception mode by the exchange of call
`
`processing messages between the BS 10 and the MS 12.
`
`FIG. 3 is a block diagram of a TSTD transmitter in the BS transmitter 12,
`
`5 for sending a signal through two antennas according to exemplary embodiments
`
`of the present invention. In the drawing, a transmission/reception filter is not
`
`shown. It is to be appreciated that in alternate embodiments, the number of the
`
`antennas may be changed to be more than two. In general, irrespective of the
`
`number of antennas use, each antenna uses a different pilot channel (in some
`
`1 o cases, pilot symbols transmitted on one antenna at a time are used instead of a
`
`pilot channel in a CDMA system).
`
`In FIG. 3, an encoder 102 encodes input user data UD, an interleaver 104
`
`interleaves the channel-encoded data, and a serial-to-parallel converter (SPC)
`
`106 divides the interleaved serial data stream into odd-numbered symbols and
`
`15 even-numbered symbols as an I-channel signal and a Q-channel signal,
`
`respectively. A Walsh and PN spreader (hereinafter, referred to as spreader) 108
`
`orthogonally modulates the I- and Q-channel signals by Walsh codes and spreads
`
`the orthogonally modulated signals by PN sequences. The spread I- and Q(cid:173)
`
`channel data is separately fed to input terminals of first and second switches 110
`
`2 o and 111 each having first and second output terminals. The first and second
`
`output terminals of the first and second switches 110 and 111 are connected to
`
`two input terminals of each of first and second modulators 114 and 116 for
`
`modulating the I- and Q-channel data by a cosine wave (cos Wet) and a sine
`
`wave (sin Wet) at a modulation frequency and adding the resulting data.
`
`2 5
`
`The first and second switches 110 and 111 are switched according to a
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`- 13 -
`
`switching pattern control signal received from a first switch controller 112 to
`
`send the I- and Q-channel data received from the spreader 108 through antennas
`
`ANT 1 and ANT 2 in accordance with the time switching pattern control signal.
`
`It is to be appreciated that data is never simultaneously transmitted through
`
`5 ANTI and ANT2 (See items 113, 144). The switching pattern control signal is
`
`generated based on a control signal received from the BS controller 18. The
`
`control signal is determined by the BS transmission mode information indicating
`
`whether the BS 10 supports a TSTD mode or not, and the message received from
`
`the MS 12 on the RACH.
`
`1 o
`
`The switching pattern control signal patterns generally may be
`
`categorized as follows:
`
`( 1) a first switching pattern: the first and second switches 110 and 111 are
`
`confined to the antenna ANT 1;
`
`(2) a second switching pattern: the first and second switches 110 and 111
`
`15 are confined to the antenna ANT2;
`
`(3) a third switching pattern: the first and second switches 110 and 111
`
`are switched between the antennas ANT 1 and ANT2, starting from the antenna
`
`ANTI; and
`
`( 4) a fourth switching pattern: the first and second switches 110 and 111
`
`2 o are switched between the antennas ANT 1 and ANT2, starting from the antenna
`
`ANT2.
`
`The first and second switching patterns are exclusively used in a non-
`
`TS TD mode, and the third and fourth switching patterns are exclusively used in a
`
`TSTD mode. In the non-TSTD mode, selection between the first and second
`
`25 switching patterns depends on a channel type. In the TSTD mode, selection
`
`between the third and fourth switching patterns depend on a TSTD pattern which
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`- 14 -
`
`will be later described.
`
`FIG. 4 is a block diagram of a TSTD receiver in the MS 12, for receiving
`
`a TSTD signal according to an embodiment of the present invention. In FIG. 4,
`
`a demodulator 202 demodulates a signal received through a reception antenna by
`
`5
`
`the cosine wave (cos Wet) and the sine wave (sin Wet) and outputs I- and Q(cid:173)
`
`channel data. A complex PN despreader (hereinafter, referred to as despreader)
`
`204 despreads the demodulated I- and Q-channel data. First and second channel
`
`correctors 206 and 208 estimate the errors of the I- and Q-channel data and
`
`multiply the original reception values by the errors.
`
`1 o
`
`The corrected data output from the first and second channel correctors
`
`206 and 208 are selected by a switch 210 which is switched according to a
`
`switching pattern control signal generated from a second switch controller 212.
`
`The switching pattern control signal is the same as that generated from the TSTD
`
`transmitter and determined based on the MS reception mode information and a
`
`15 message received from the BS 10 on the BCCH.
`
`A paralell-to-serial converter (PSC) 214 com1ected to an output node of
`
`the switch 210 converts switchedly input channel-corrected parallel data to serial
`
`data. The serial data is deinterleaved by a deinterleaver 216 connected to an
`
`output node of the PSC 214. A decoder 218 decodes the deinterleaved data and
`
`2 o outputs the decoded data as user data (UD).
`
`FI Gs. 5-8 will be briefly described, after which a detailed description will
`
`be provided with reference to FIGs. 2-8.
`
`FIG. 5 is a message exchange flow diagram illustrating the exchange of
`
`Intel, Exhibit 1003
`
`

`

`W099/59263
`
`PCT /KR99/00238
`
`- 15 -
`
`messages between the BS and the MS for controlling a TSTD mode, FIG. 6 is a
`
`flowchart of an MS operation for setting a reception mode by exchanging
`
`messages with the BS and receiving a TSTD message, and FIG. 7 is a flowchart
`
`of a BS operation for setting a transmission mode by exchanging messages with
`
`s the MS and sending traffic channel data.
`
`FIG. 8A illustrates the format of a broadcast message transmitted to a
`
`plurality of MSs by a BS, FIG. 8B illustrates the format of an access message
`
`transmitted to a BS by an MS, and FIG. 8C illustrates the format of a CCCH
`
`message transmitted to an MS by a BS.
`
`1 o
`
`Referring now to FI Gs. 2 to 8C, a detailed description of (1) setting a
`
`TSTD mode, and (2) transmission and reception of TSTD data in a mobile
`
`communication system having TSTD as an optional function will be provided.
`
`When a mobile communication system having a transmission channel
`
`structure as shown in FIG. 2 is operated, the BS controller 18 of the BS 10
`
`15 controls the BS transmitter 18 to send all the MS receivers 20 in the coverage
`
`area of the BS 10 the broadcast message of FIG. 8A on the BCCH as detailed in
`
`steps 502 of FIG. 5 and step 602 of FIG. 6. The broadcast message includes a
`
`message type, the transmission mode of the BS 10, and other information. The
`
`BS transmission mode value indicates whether the BS transmission mode is
`
`2 o TSTD or non-TSTD. The BS controller 18 also determines whether the BS
`
`receiver 16 has received the reception mode information of the MS 12 on the
`
`RACH.
`
`Referring to FIG. 2, if power is turned on in the MS 12 while the BS 10 is
`
`operated, the MS controller 24 controls the MS receiver 20 to acquire a pilot
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`- 16 -
`
`signal or a synchronization providing channel from the BS transmitter 14 and
`
`synchronizes its timing to the BS 10, in step 702 of FIG. 7. In step 704, the MS
`
`12 receives information about the BS 10 on the BCCH. The information
`
`includes the TSTD mode information. In steps 504 of FIG. 5 and 706 of FIG. 7,
`
`5
`
`the MS transmitter 22 sends the BS receiver 16 the access message on the RACH
`
`as shown in FIGs. 2 and 8B. The MS 10 register with the BS 10, MS (i.e.,
`
`reception mode) by sending access message on the RACH to register with the
`
`BS 10, and notifies the BS 10 of information about the MS 12 through this
`
`registration procedure (See FIG. 8b ). The RACH message includes the TSTD
`
`1 o mode information.
`
`Then, the BS controller 18 and the MS controller 24 analyze the access
`
`message and the broadcast message, respectively, to determine whether a TSTD
`
`communication is possible. If such a communication is possible, the BS 10 and
`
`the MS 12 perform a traffic channel set-up in step 506 of FIG. 5 and control
`
`15 their respective TSTD transmitter and receiver of FI Gs. 3 and 4 in response to
`
`TSTD switching pattern control signals determined in a determined operation
`
`mode. The determined operation mode will be described in more detail below.
`
`The BS controller 18 analyzes the reception mode of the MS 12 on the
`
`RACH in step 604 of FIG. 6, and determines whether a TCH assignment request
`
`2 o was received from the MS on the RACH in step 606 of FIG. 6. Upon receipt of
`
`a TCH assignment request from the MS 12, the BS controller 18 proceeds to step
`
`608. Otherwise, the BS controller 18 awaits a TCH assignment request on the
`
`RACH.
`
`In step 608, upon receiving a TCH assignment request, the BS controller
`
`2 5 18 determines whether the TCH can be assigned. If there is an available TCH,
`
`Intel, Exhibit 1003
`
`

`

`WO 99/59263
`
`PCT /KR99/00238
`
`- 17 -
`
`the BS controller 18 assigns the TCH and notifies the MS 12 of a TSTD pattern
`
`by sending the MS 12 the message of FIG. SC on the CCCH. The CCCH
`
`message may include the TSTD mode change information and TSTD pattern
`
`information. Here, the TSTD mode change information is a field indicating the
`
`5 TSTD mode is changed to a non-TS TD mode when the BS does not want to use
`
`the TSTD mode. The TSTD pattern field provides a TSTD pattern in which data
`
`is switchedly transmitted through the antennas ANTI and ANT2 by the BS 10.
`
`The TSTD mode change field and the TSTD pattern field are optional.
`
`In step 612, the BS controller 18 determines whether the MS 12 is set to a
`
`1 o TS TD reception mode from the reception mode field of the received RACH
`
`message. If the MS 12 is in the TSTD mode, the BS contr