1111111111111111 IIIIII IIIII 11111 1111111111 1111111111 lllll lllll lllll 111111111111111 11111111
`c19) United States
`
`
`c12) Patent Application Publication
`c10) Pub. No.: US 2008/0285668 Al
`(43) Pub. Date: Nov. 20, 2008
`Lee et al.
`
`US 20080285668Al
`
`(54)METHOD FOR PROCESSING CONTROL
`
`INFORMATION IN A WIRELESS MOBILE
`(60)Provisional application No. 60/732,080, filed on Oct.
`
`
`COMMUNICATION SYSTEM
`
`31, 2005, provisional application No. 60/732,288,
`
`filed on Oct. 31, 2005.
`
`
`
`Related U.S. Application Data
`
`
`
`(30) Foreign Application Priority Data
`
`(76)Inventors:Young-Dae Lee, Gyeonggi-Do
`
`
`
`(KR); Sung-Duck Chun,
`
`Gyeonggi-Do (KR); Myung-Cheul
`Oct. 31, 2005 (KR) ........................ 10-2005-0103510
`
`
`
`
`Jung, Seoul (KR); Sung-Jun Park,
`
`
`Jul. 5, 2006 (KR) ........................ 10-2006-0063139
`
`Gyeonggi-Do (KR); Patrick
`
`Fischer, Bourg la Reine (FR)
`
`
`
`Publication Classification
`
`Correspondence Address:
`
`LEE, HONG, DEGERMAN, KANG &
`SCHMADEKA
`(57)
`660 S. FIGUEROA STREET, Suite 2300
`LOS ANGELES, CA 90017 (US)
`
`(51)Int. Cl.
`H04L 27128(2006.01)
`
`(52)U.S. Cl. ........................................................ 375/260
`
`ABSTRACT
`
`In a wireless mobile communications system, a method for
`
`
`
`
`
`
`
`
`
`processing control information allows the operations of a
`
`
`
`
`mobile terminal to be simplified and permits efficient use of
`
`
`
`
`
`resources for the mobile terminal. The network instructs in
`
`
`
`
`advance, the transmission of control information, such as
`
`
`
`
`system information and the like, via a single indicator chan­
`
`
`
`
`
`nel. The mobile terminal receives this single indicator chan­
`(86)
`PCT No.: PCT/KR2006/004370
`
`
`nel and uses the indicator information that was transmitted via
`
`the indicator channel in order to receive the control informa­
`tion.
`
`(21)
`Appl. No.: 12/092,055
`
`(22)
`PCT Filed: Oct. 25, 2006
`
`§ 371 (c)(l),
`
`(2), ( 4) Date:Apr. 29, 2008
`
`[]
`
`SAMSUNG 1006
`
`1
`
`

`

`Patent Application Publication
`
`Nov. 20, 2008 Sheet 1 0f 4
`
`US 2008/0285668 A1
`
`[Fig. 1]
`
`1 Frame (10 ms)
`
`K—H"—/;—-\
`
`-—_-
`
`l
`
`1 Sub-frame (0.5 ms)
`
`[Fig. 2]
`
`1 Sub-frame (0.5 ms)
`
`
`
`[Fig. 3]
`
`FREQUENCY DOMAIN
`
`0.51113
`
`I: FIRST REFERENCE SYMBOL
`I: SECOND REFERENCE SYMBOL
`E]: DATA
`
`2
`
`

`

`Patent Application Publication
`
`Nov. 20, 2008 Sheet 2 0f 4
`
`US 2008/0285668 A1
`
`[Fig.14]
`
`
`
`%%§£WI I 139%.
`
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`
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`
`Patent Application Publication
`
`Nov. 20, 2008 Sheet 3 0f 4
`
`US 2008/0285668 A1
`
`Frequency
`
`[Fig. 7]
`
`
`
`Resource Block (RB)
`(1 or more chunks)
`
`
`
` LTIL2 control info (FCCH. SCCH)
`
`
`
`
`
`
` 1 Sub-frame
`
`Time
`
`(0.5 ms)
`
`Scalable Cell Bandwidth
`(1.25 ~ 20 MHz)
`
`Sub—carriers
`
`Center Frequency
`(used for eye. Info.)
`
`FREQUENCY
`
`
`
`
`
`
`
`
`
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`
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`BANDW IDTII
`
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`
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`
`
`
`
`
`
`
`
`
`4
`
`

`

`Patent Application Publication
`
`Nov. 20, 2008 Sheet 4 0f 4
`
`US 2008/0285668 A1
`
`[Fig. 10]
`
`FREQUENCY
`
`FCCH
`
`TIME
`
`
`/////FCCHIDLE MODE/WF/(UL)//
`///ACTIVE MODE
`
`ACTIVE MODE
`(DD / /
`vvvvv
`
`[Fig. 11]
`
`FREQUENCY
`x
`
`
`
`5
`
`

`

`US 2008/0285668 A1
`
`Nov. 20, 2008
`
`METHOD FOR PROCESSING CONTROL
`INFORMATION IN A WIRELESS MOBILE
`COMMUNICATION SYSTEM
`
`TECHNICAL FIELD
`
`[0001] The present invention relates to wireless (radio)
`mobile communication systems, and in particular, relates to a
`method for processing control information allows the opera-
`tions of a mobile terminal to be simplified and permits effi-
`cient use of resources for the mobile terminal.
`
`BACKGROUND ART
`
`To support broadband wireless (e.g., WiMAX)
`[0002]
`access, there are different types of broadband wireless air
`interfaces, such as cellular 3G technologies (e.g., UMTS,
`WCDMA, etc .), and multi-carrier based multiple access tech-
`niques (e.g., OFDMA, OFDM-TDMA, OFDM-CDMA,
`etc.). Frequency division multiplexing involves sub-channel-
`ization, of which at least four types (OFDM, Flash OFDM,
`sOFDMA and OFDMA) exist.
`[0003] Orthogonal Frequency Division Multiplexing
`(OFDM) involves the splitting of a radio signal into multiple
`smaller sub-signals that are then transmitted simultaneously
`at different frequencies to a receiver. OFDM refers to a form
`of multi-carrier transmission where all the sub-carriers are
`
`orthogonal to each other. Certain IEEE standards and 3GPP
`standards are related to various aspects of OFDM.
`[0004]
`FIGS. 1 and 2 show a typical frame that is used in
`OFDM. One frame has a time duration of 10 ms (millisec-
`onds) and consists of 20 sub-frames, each having a time
`duration of 0.5 ms. Each sub-frame may consist of a resource
`block (RB) that contains data or information, and a cyclic
`prefix (CP) that is a guard interval needed for conventional
`OFDM modulation (but not needed for OFDM with pulse
`shaping, i.e., OFDM/OQAM). The sub-frame duration cor-
`responds to the minimum downlink TTI (Transmission Time
`Interval).
`FIG. 3 shows a basic downlink reference-signal
`[0005]
`structure consisting of known reference symbols. Namely, a
`mapping ofphysical channel symbols in frequency domain is
`shown. In other words, channel-coded, interleaved, and data-
`modulated information (i.e., Layer 3 information) is mapped
`onto OFDM time/frequency symbols. The OFDM symbols
`can be organized into a number (M) of consecutive sub-
`carriers for a number (N) of consecutive OFDM symbols.
`[0006] Here, it is assumed that 7 OFDM symbols exist per
`sub-frame (when the CP length is short). In case of a long CP
`or a different frame structure, this basic downlink reference-
`signal structure would be slightly different.
`[0007] Reference symbols (i.e., first reference symbols) are
`located in the first OFDM symbol of every sub-frame
`assigned for downlink transmission. This is valid for both
`FDD and TDD, as well as for both long and short CP. Addi-
`tional reference symbols (i.e., second reference symbols) are
`located in the third last OFDM symbol of every sub-frame
`assigned for downlink transmission. This is the baseline for
`both FDD and TDD, as well as for both long and short CP.
`However, for FDD, an evaluation of whether the second ref-
`erence symbols are need should be made.
`[0008]
`FIG. 4 shows an exemplary structure of an Evolved
`Universal Mobile Telecommunications System (E-UMTS).
`The E-UMTS system is a system that has evolved from the
`
`UMTS system, and its standardization work is currently
`being performed by the 3GPP standards organization.
`[0009] The E-UMTS network generally comprises at least
`one mobile terminal (i.e., user equipment: UE), base stations
`(i.e., Node Bs), a control plane server (CPS) that performs
`radio (wireless) control functions, a radio resource manage-
`ment (RRM) entity that performs radio resource management
`functions, a mobility management entity (MME) that per-
`forms mobility management functions for a mobile terminal,
`and an access gateway (AG) that is located at an end of the
`E-UMTS network and connects with one or more external
`
`networks. Here, it can be understood that the particular names
`of the various network entities are not limited to those men-
`tioned above.
`
`[0010] The various layers of the radio interface protocol
`between the mobile terminal and the network may be divided
`into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based upon
`the lower three layers of the Open System Interconnection
`(OSI) standard model that is known the field of communica-
`tion systems. Among these layers, a physical layer that is part
`of Layer 1 provides an information transfer service using a
`physical channel, while a Radio Resource Control (RRC)
`layer located in Layer 3 performs the function of controlling
`radio resources between the mobile terminal and the network.
`
`To do so, the RRC layer exchanges RRC messages between
`the mobile terminal and the network. The functions of the
`
`RRC layer may be distributed among and performed within
`the Node B, the CPS/RRM and/or the MME.
`[0011]
`FIGS. 5 and 6 show an exemplary architecture ofthe
`radio interface protocol between the mobile terminal and the
`UTRAN (UMTS Terrestrial Radio Access Network). The
`radio interface protocol of FIGS. 5 and 6 is horizontally
`comprised of a physical layer, a data link layer, and a network
`layer, and vertically comprised of a user plane for transmit-
`ting user data and a control plane for transferring control
`signaling. The radio interface protocol layer of FIGS. 5 and 6
`may be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer
`3) based upon the lower three layers of the Open System
`Interconnection (OSI) standards model that is known the field
`of communication systems.
`[0012]
`Particular layers of the radio protocol control plane
`of FIG. 5 and ofthe radio protocol user plane of FIG. 6 will be
`described below. The physical layer (i.e., Layer 1) uses a
`physical channel to provide an information transfer service to
`a higher layer. The physical layer is connected with a medium
`access control (MAC) layer located thereabove via a transport
`channel, and data is transferred between the physical layer
`and the MAC layer via the transport channel. Also, between
`respectively different physical layers, namely, between the
`respective physical layers of the transmitting side (transmit-
`ter) and the receiving side (receiver), data is transferred via a
`physical channel.
`[0013] The MAC layer of Layer 2 provides services to a
`radio link control (RLC) layer (which is a higher layer) via a
`logical channel. The RLC layer of Layer 2 supports the trans-
`mission of data with reliability. It should be noted that the
`RLC layer in FIGS. 5 and 6 is depicted in dotted lines,
`because if the RLC functions are implemented in and per-
`formed by the MAC layer, the RLC layer itself may not need
`to exist. The PDCP layer of Layer 2 performs a header com-
`pression function that reduces unnecessary control informa-
`tion such that data being transmitted by employing Internet
`
`6
`
`

`

`US 2008/0285668 A1
`
`Nov. 20, 2008
`
`protocol (IP) packets, such as IPv4 or IPv6, can be efficiently
`sent over a radio (wireless) interface that has a relatively small
`bandwidth.
`
`[0014] The radio resource control (RRC) layer located at
`the lowermost portion of Layer 3 is only defined in the control
`plane, and handles the control of logical channels, transport
`channels, and physical channels with respect to the configu-
`ration, reconfiguration and release of radio bearers (RB).
`Here, the RB refers to a service that is provided by Layer 2 for
`data transfer between the mobile terminal and the UTRAN.
`[0015] As for channels used in downlink transmission for
`transmitting data from the network to the mobile terminal,
`there is a broadcast channel (BCH) used for transmitting
`system information, and a shared channel (SCH) used for
`transmitting user traffic or control messages. As for channels
`used in uplink transmission for transmitting data from the
`mobile terminal to the network, there is a random access
`channel (RACH) used for transmitting an initial control mes-
`sage, and a shared channel (SCH) used for transmitting user
`traffic or control messages.
`
`DISCLOSURE OF INVENTION
`
`Technical Problem
`
`[0016] Before sending data to a particular mobile terminal,
`an indicator (which informs in advance that a notification
`message for a multicast and broadcast service will be trans-
`mitted) is transmitted through a separate (distinct) channel. In
`addition to this channel, the mobile terminal must also receive
`other channels, such as a broadcast channel used to periodi-
`cally transmit system information. As there are a large total
`number of channels that a mobile terminal should receive due
`
`to transmissions through separate (distinct) channels accord-
`ing to each type of purpose, problems related to more com-
`plicated mobile terminal operations and a waste of mobile
`terminal resources occur.
`
`Technical Solution
`
`[0017] The present invention has been developed in order to
`solve the above described problems of the related art. As a
`result, the present invention provides a method for processing
`control information such that the operations of a mobile ter-
`minal can be simplified and permits efficient use of resources
`for the mobile terminal.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 shows an exemplary structure of one frame
`[0018]
`used in OFDM.
`
`FIG. 2 shows an exemplary structure of one sub-
`[0019]
`frame within the frame of FIG. 1.
`
`FIG. 3 shows an example of how data and reference
`[0020]
`symbols for OFDM may be expressed in the frequency
`domain and the time domain.
`
`FIG. 4 shows an overview of a E-UMTS network
`[0021]
`architecture.
`
`FIGS. 5 and 6 show an exemplary structure (archi-
`[0022]
`tecture) of a radio interface protocol between a mobile termi-
`nal and a UTRAN according to the 3GPP radio access net-
`work standard.
`
`FIG. 7 is a diagram to explain the features of the
`[0023]
`present invention by showing where the control information
`and resource blocks may be located within each sub-frame
`with respect to frequency and time.
`
`FIG. 8 is a diagram used to explain a control infor-
`[0024]
`mation transmission and reception method according to an
`exemplary embodiment of the present invention.
`[0025]
`FIG. 9 is a diagram used to explain a control infor-
`mation transmission and reception method according to
`another exemplary embodiment of the present invention.
`[0026]
`FIG. 10 is a diagram used to explain constituting
`information of an FCCH according to an exemplary embodi-
`ment of the present invention.
`[0027]
`FIG. 11 shows a data reception method for a mobile
`terminal according to an exemplary embodiment of the
`present invention.
`
`MODE FOR THE INVENTION
`
`[0028] One aspect of the present invention is the recogni-
`tion by the present inventors regarding the problems and
`drawbacks ofthe related art described above and explained in
`more detail hereafter. Based upon such recognition, the fea-
`tures of the present invention have been developed.
`[0029]
`In the related art, it can be said that the system
`information is always fixed or non-flexible. Such fixed format
`allows a mobile terminal to easily detect and properly read the
`system information transmitted from the network.
`[0030]
`In contrast, the features of the present invention
`allow at least some portions of the system information to be
`dynamically (or flexibly) changed. Appropriate indicators are
`included such that a mobile terminal can properly detect and
`read the dynamic (flexible) system information. As a result,
`additional system information may be added as desired in
`order to support
`technical evolution and advancements,
`which thus allows for future enhancements or continued
`
`expansion of currently used system information.
`[0031]
`It should be noted that the features of the present
`invention are related to issues regarding the long-term evolu-
`tion (LTE) of the 3GPP standard. As such, the 3GPP TS
`25.813 (LTE TR) and its related sections or portions thereof,
`as well as various developing enhancements thereofpertain to
`the present invention. Such enhancements and evolution have
`resulted in the use of a particular prefix (the letter E) when
`labeling various network entities (e.g., eNode B), protocol
`layers, channels, and the like. However,
`it can be clearly
`understood that such labeling and other terminology are
`merely exemplary and thus may be altered (or later clarified)
`as a result of ongoing or future discussions.
`[0032]
`FIG. 7 is a diagram to explain the features of the
`present invention by showing where the control information
`and resource blocks may be located within each sub-frame
`with respect to frequency and time.
`[0033] The structure (format) of a sub-frame in relation to
`the frequency domain and the time domain can be understood
`from FIG. 7. Namely, a single sub-frame has a time duration
`of 0.5 ms with 7 OFDM symbols (portions) therein.
`[0034]
`In the first portion of the sub-frame, control infor-
`mation (i.e., L1/L2 control information, FCCH, SCCH, etc.)
`is included, while resource blocks (RBs) that may be in the
`form of one or more chunks may be located in the remaining
`portion of the subframe. Here, a resource block may occupy
`the entire time duration of the sub-frame (excluding the time
`duration for the control information) or some partial time
`duration thereof. Also, each resource block (RB) may use a
`particular frequency range (i.e., a particular number of sub-
`carriers).
`[0035] The frequency axis can be referred to as a scalable
`cell bandwidth, which typically has a frequency range of
`
`7
`
`

`

`US 2008/0285668 A1
`
`Nov. 20, 2008
`
`1.25-20 MHZ. A plurality of sub-carriers exists in the scalable
`cell bandwidth. Of this frequency range, a so-called center
`frequency (ofapproximately 10 MHZ) is mainly used in trans-
`mitting system information.
`[0036]
`In the related art, such system information is con-
`sidered to be fixed. Although this allows the terminal to easily
`read the system information, addition of new system infor-
`mation is not possible. In contrast, the present invention
`allows for at least part ofthe system information to be flexible
`(or dynamic).
`[0037]
`To do so, the present invention divides (or separates
`or distinguishes) the system information into primary system
`information (e.g., Master Information Block: MIB) and non-
`primary (or secondary) system information (e.g., System
`Information Block: SIB).
`[0038] The MIB is transmitted in a static manner (e.g., Via
`a BCH for fixed manner transmission), while the SIB is trans-
`mitted in a dynamic manner (e.g., Via a downlink SCH for
`dynamic manner transmission). Here,
`transmission in a
`dynamic manner means that different frequency ranges and
`time durations can be used.
`
`For each frame, the MIB contains information about
`[0039]
`where each SIB is located. Namely, the particular frequency
`range (i.e., sub-carriers) and particular time duration (i.e.,
`symbols) for each SIB is specified to allow the terminal (UE)
`to properly read the appropriate SIBs. For example, the MIB
`may indicate that a particular UE (e.g., UE #11) should read
`a particular resource block (e.g., RB #3). Here, the RB #3 can
`also be expressed as the information located at certain sub-
`carriers and certain symbols (e.g., at sub-carriers #13~60 and
`symbols #3~5).
`[0040]
`In a similar manner, for each sub-frame within one
`frame, the control information (located in the first portion)
`contains information about where each resource block (RB)
`is located. Namely, the frequency range and particular time
`duration for each RB is specified to allow the terminal (UE) to
`properly read the appropriate RBs.
`[0041] The above concepts generally depicted in FIG. 7
`will be explained in more detail in the following description
`with reference to FIGS. 8 through 11.
`[0042]
`FIG. 8 is a diagram used to explain a control infor-
`mation transmission and reception method according to an
`exemplary embodiment ofthe present invention. The network
`transmits a frame control channel (FCCH) at every particular
`period (i.e., a first period). Hereafter, the particular period is
`referred to as a frame.
`
`It should be noted that the FCCH may also be
`[0043]
`described in different terms. Namely, the control information
`transmitted by the network may be called L 1/L2 control infor-
`mation, FCCH, SCCH, or the like. Hereafter, such control
`information will mostly be referred to as FCCH, merely for
`the sake of explanation (although control information and
`SCCH are also described).
`[0044] As shown in FIG. 8, a MIB (Master Information
`Block) is repetitively transmitted at every second period,
`which is different that the above-mentioned first period. The
`MIB includes scheduling information for a SIB (System
`Information Block) that transmits system information and
`other resource blocks (RBs) for each type of control informa-
`tion. Namely,
`the MIB provides scheduling information
`related to which frequency and what time is used to transmit
`each type of control information, such as multiple SIBs, and
`the like. The second period may set to be greater than the first
`
`period. The MIB may be transmitted in the first frame of the
`period in which the MIB is to be transmitted.
`[0045] Here, the FCCH that is transmitted in each frame
`can inform about whether the data transmitted in the corre-
`
`sponding time duration (frame) is a common control mes-
`sage, a control message dedicated for a particular mobile
`terminal, common data, or data dedicated for a particular
`mobile terminal. Also, the FCCH informs about which fre-
`quency and what time within the frame that a control mes sage
`or data of the control information is transmitted.
`
`[0046] The mobile terminal periodically receives the
`FCCH at every first period. If the FCCH of a particular frame
`indicates the transmission of a MIB, the mobile terminal
`receives the MIB at the corresponding frequency and time in
`accordance with the scheduling information included in the
`indicator information transmitted through the FCCH. By
`referring to the MIB, the mobile terminal can obtain sched-
`uling information for particular messages, particular indica-
`tor messages, and the like. Through such scheduling infor-
`mation, the mobile terminal can determine which frequency
`and what time was used to transmit a particular SIB or the
`like. According to such scheduling information, the mobile
`terminal can receive a message with respect to the SIB, and
`the subscribed service that is should receive.
`
`[0047] The MIB may include either a mobile terminal iden-
`tifier or a service identifier, or may include an indicator that
`indicates such an identifier.
`
`FIG. 9 is a diagram used to explain a control infor-
`[0048]
`mation transmission and reception method according to
`another exemplary embodiment of the present invention. A
`cell that supports broadband frequencies with a bandwidth of
`10 or 20 MHZ, can provide a system bandwidth of narrow-
`band frequencies for a mobile terminal operating in narrow-
`band frequencies such as 1.25 MHZ, 2.5 MHZ, or the like. In
`this case, as shown in FIG. 9, a central bandwidth of the
`broadband frequencies is typically used for the system band-
`width. Here, the MIB, the SIBs, and the like should all be
`transmitted in the system bandwidth. However, SIBs that
`transmit particular system information may be transmitted
`outside of the system bandwidth.
`[0049] The FCCH (or other type of system information like
`Ll/L2 control information, SCCH, etc.) transmitted in each
`frame indicates whether the data transmitted in the corre-
`
`sponding time duration (frame) is a MIB, an SIB, or the like.
`Also, the FCCH informs about which frequency and what
`time within the frame that each message or data is transmit-
`ted. The FCCH may be transmitted upon being divided into an
`FCCH for system bandwidth and an FCCH for non-system
`bandwidth. Accordingly, a mobile terminal that only receives
`the system bandwidth may receive the FCCH for system
`bandwidth to obtain information of each data or message that
`is transmitted via the system bandwidth. Also, a mobile ter-
`minal that receives the non-system bandwidth may receive
`the FCCH for non-system bandwidth to obtain information of
`each data or message that is transmitted via the non-system
`bandwidth.
`
`In other words, the concepts shown in FIG. 9 are for
`[0050]
`handling the situation for mobile terminals in idle mode.
`[0051] The network (system) supports the cell bandwidth
`of 20 MHZ, while a mobile terminal typically can only sup-
`port a 10 MHZ bandwidth range. Thus, the Ll/L2 control
`information needs to be transmitted in certain units (a fre-
`quency range) such as, a range of 10 MHZ, 5 MHZ, or the like.
`As a result, there may be three scenarios for the frequency
`
`8
`
`

`

`US 2008/0285668 A1
`
`Nov. 20, 2008
`
`ranges used by the mobile terminal for reading data. Namely,
`of the 20 MHZ scalable cell bandwidth, the mobile terminal
`may read one of three frequency ranges, i.e., the lower 10
`MHZ, the upper 10 MHZ, or a middle (intermediate) 10 MHZ
`thereof.
`
`For mobile terminals in RRC connected mode,
`[0052]
`because the particular cell in which the connected mode
`mobile terminal is located is known, any one of the three 10
`MHZ ranges and appropriate switching among these three 10
`MHZ ranges is possible. However, for a mobile terminal in
`idle mode, because the particular cell in which the terminal is
`located cannot be known, only one of these three 10 MHZ
`ranges can be used (typically, the intermediate 10 MHZ range
`is used). Meanwhile, the bandwidth outside the intermediate
`10 MHZ range can be used for transmitting and receiving
`resource blocks for mobile terminals in connected mode.
`
`[0053] Here, although the above exemplary embodiment
`with reference to FIG. 9 is described for 10 MHZ ranges, it is
`contemplated that the 20 MHZ scalable cell bandwidth could
`also be divided up into 5 MHZ units.
`[0054]
`FIG. 10 is a diagram used to explain constituting
`information of control information (i.e., an FCCH) according
`to an exemplary embodiment of the present invention. The
`FCCH provides to the mobile terminal, various types of con-
`trol information related to data and control messages trans-
`mitted during the corresponding period (i.e., during the cor-
`responding frame). Here, the FCCH is shown to be comprised
`of five different FCCH portions. However, this is merely
`exemplary, and the number of FCCH portions may vary
`accordingly.
`[0055] Referring to FIG. 10, the first FCCH portion is a
`FCCH MAP that informs about the frequency and time of the
`FCCH transmission, a length of the FCCH information, radio
`resource parameters needed for receiving the FCCH informa-
`tion, and the like. Such FCCH MAP may be always included
`in each frame. In the present invention, each frame may
`include all types of FCCHs or may include only portions
`thereof. The FCCH MAP may inform about whether or not
`the remaining four types of FCCH portions (excluding the
`FCCH MAP) are transmitted in the corresponding frame.
`[0056] The second FCCH portion is a FCCH Idle Mode
`(DL) that includes control information needed on order to
`receive downlink control information when the mobile termi-
`
`nal is in idle mode. This second FCCH portion may be
`included in a corresponding frame when control information
`to be transmitted on the downlink exists in the frame. The
`
`control information related to common control messages
`such as the MIB, SIB, etc. may be included in this second
`FCCH portion. Also, the MIB, SIB, etc. may be included in
`this second FCCH portion.
`[0057] The third FCCH portion is a FCCH Idle Mode (UL)
`that includes control information needed in order to transmit
`
`uplink control information when the mobile terminal is in idle
`mode. This third FCCH portion may include information that
`is needed for uplink random access transmissions. When the
`mobile terminal transmits a random access message, the net-
`work may transmit a response to the ransom access message
`via this third FCCH portion. Also, the third FCCH portion can
`be used to inform that a response to the random access mes-
`sage is being transmitted in the frame that is used to transmit
`the third FCCH portion, and to do so, the third FCCH portion
`includes control information related to such response to the
`random access message.
`
`[0058] The fourth FCCH portion includes control informa-
`tion needed in order to receive downlink control information
`when the mobile terminal is in active mode. This fourth
`
`FCCH portion may include control information of an down-
`link shared channel (SCH) that is transmitted in a correspond-
`ing frame.
`[0059] The fifth FCCH portion includes control informa-
`tion needed in order to transmit uplink control information
`when the mobile terminal is in active mode. This fifth FCCH
`
`portion may include control information of an uplink shared
`channel (SCH) that is transmitted in a corresponding frame.
`[0060] The mobile terminal periodically receives the
`FCCH MAP and may check to see whether the corresponding
`frame contains any data or information that is wishes to
`receive. After receiving the FCCH MAP, when the mobile
`terminal is in idle mode, only the second and third FCCH
`portions are received. When the mobile terminal is in active
`mode, only the fourth and fifth FCCH portions are received.
`[0061]
`In order to inform about the control information that
`is needed for multicast and broadcast transmissions, the net-
`work may add and transmit other FCCH portions as needed.
`[0062]
`FIG. 11 shows a data reception method for a mobile
`terminal according to an exemplary embodiment of the
`present invention. Referring to FIG. 11, the SCCH channel
`(i.e., control information) is transmitted using a respectively
`different frequency and time from those of the SCH, and is
`transmitted once per each sub-frame. One sub-frame is 0.5 ms
`in duration and the SCCH channel is transmitted by using one
`or two symbols that constitute the corresponding sub-frame.
`A single sub-frame consists of 6 or 7 symbols, and respec-
`tively different symbols constitute respectively different time
`periods (durations).
`[0063]
`In FIG. 11, the SCCH channel that is transmitted in
`a single sub-frame, transmits control information related to a
`SCH channel of the corresponding sub-frame. The control
`information transmitted through the SCCH channel may
`comprise a mobile terminal identifier (identity), a multicast
`service identifier (identity), and a logical channel identifier
`(identity). The logical channel identifier may inform whether
`the data transmitted in a sub -frame ofthe corresponding SCH
`channel is data for a mobile terminal dedicated channel (e. g.,
`DCCH or DTCH) or data for a common channel. In particu-
`lar, if the data is for a common channel, the logical channel
`identifier informs about the type of common channel (i.e.,
`BCCH, PCCH, MCCH, MTCH, or CCCH).
`[0064] The mobile terminal may receive the SCCH channel
`in a periodic manner or at every sub-frame. To do so, the base
`station (eNode B) transmits period information to the mobile
`terminal. Then, the mobile terminal may receive the sub-
`frames of the SCCH channel in a periodic manner according
`to the period information provided from the base station.
`[0065] The mobile terminal obtains the logical channel
`identifier through the received SCCH channel, and by means
`ofthe obtained logical channel identifier, the mobile terminal
`can determine whether the data transmitted via the SCH chan-
`nel is data for a dedicated channel or data for one of a BCCH,
`PCCH, MCCH, MTCH or CCCH (i.e., a common channel).
`[0066]
`If the logical channel identifier indicates a common
`channel, the mobile terminal receives the sub-frame of the
`corresponding SCH channel to thus receive the data of the
`common channel.
`
`It should be noted that FIGS. 1 through 11 show
`[0067]
`exemplary embodiments for a 10 ms frame having twenty 0.5
`ms sub -frames. However, the features ofthe present invention
`
`9
`
`

`

`US 2008/0285668 A1
`
`Nov. 20, 2008
`
`are clearly applicable to other techniques that employ other
`frame sizes. For example, a frame size of 5 ms may be used,
`and to support LTE (Long Term Evolution) techniques, a
`frame size of 0.5 ms may be used.
`[0068] Regarding the effects of the present invention, the
`wireless network can, in advance, inform (through a single
`indicator channel) about the transmission of common control
`information (such as particular messages, system informa-
`tion, or the like). A radio mobile terminal can periodically
`receive the single indicator channel to thus receive the com-
`mon control information by using the control information of
`the indicator channel. By using such procedures, the opera-
`tions of the mobile terminal may be simplified and mobile
`terminal resources can be used more efficiently.
`[0069] Additionally, as the present
`invention provides
`information about where each resource block (RB) is located
`with respect to the frequency and time domains, system infor-
`mation, control information, and the like can be processed in
`a dynamic and flexible manner,
`to thus support various
`enhanced capabilities. Also, when frequency selective sched-
`uling is performed, improved adaptation to channel changes
`can be achieved.
`
`[0070] The present invention provides a method for pro-
`cessing (downlink) system information for a mobile terminal,
`the method comprising: receiving primary system informa-
`tion in a static manner; and receiving non-primary system
`information in a dynamic manner based on the primary sys-
`tem information.
`
`[0071] The dynamic manner may be based upon at least one
`of frequency, time, and size of the non-primary system infor-
`mation. The primary system information may include sched-
`uling information that indicates at least one of a time charac-
`teristic and a frequency characteristic of the non-primary
`system information. The primary system information may
`further comprise