WO2008018711A2 - Procédé et dispositif de transmission d'informations de rétroaction - Google Patents

Procédé et dispositif de transmission d'informations de rétroaction Download PDF

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Publication number
WO2008018711A2
WO2008018711A2 PCT/KR2007/003673 KR2007003673W WO2008018711A2 WO 2008018711 A2 WO2008018711 A2 WO 2008018711A2 KR 2007003673 W KR2007003673 W KR 2007003673W WO 2008018711 A2 WO2008018711 A2 WO 2008018711A2
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WO
WIPO (PCT)
Prior art keywords
information
feedback
tiles
payload
classes
Prior art date
Application number
PCT/KR2007/003673
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English (en)
Other versions
WO2008018711A3 (fr
Inventor
Kwang-Jae Lim
Chul-Sik Yoon
Original Assignee
Electronics And Telecommunications Research Institute
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from KR1020070010952A external-priority patent/KR101358424B1/ko
Application filed by Electronics And Telecommunications Research Institute, Samsung Electronics Co., Ltd. filed Critical Electronics And Telecommunications Research Institute
Priority to US12/376,568 priority Critical patent/US8483147B2/en
Publication of WO2008018711A2 publication Critical patent/WO2008018711A2/fr
Publication of WO2008018711A3 publication Critical patent/WO2008018711A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04L5/0046—Determination of how many bits are transmitted on different sub-channels

Definitions

  • the present invention relates a method and apparatus for transmitting feedback information.
  • the present invention relates to a method and apparatus for adaptively transmitting feedback information according to a channel environment of a mobile terminal.
  • the IEEE 802.16 has formulated a standard for an OFDMA mobile communication.
  • mobile terminals periodically transmit feedback information to a base station through a feedback channel (Feedback) of an uplink.
  • the mobile terminals feed back information including channel quality information, information for multiple antenna transmissions, and base station selection information to the base station.
  • the base station performs packet scheduling, setting an adaptive modulation and coding scheme, setting an antenna weight in multiple antenna transmissions, and a high-speed handoff.
  • a periodic feedback channel needs to be allocated for use in feedback information from which intermittent feedback is required.
  • the present invention has been made in an effort to provide a method and apparatus for adaptively transmitting feedback information according to a channel environment of a mobile terminal.
  • An exemplary embodiment of the present invention provides a method of transmitting feedback information.
  • the method includes receiving channel allocation information that includes classification information for classifying a plurality of payloads corresponding to feedback information into a plurality of classes, information on a plurality of transmission periods corresponding to each of the plurality of payloads, and information on the number of a plurality of tiles corresponding to each of the plurality of classes, multiplexing the plurality of payloads for each of the plurality of classes in accordance with the classification information, the information on the plurality of transmission periods, and the information on the number of the plurality of tiles that are included in the channel allocation information to created a plurality of tile groups corresponding to each of the plurality of classes for periods of the plurality of classes according to the plurality of transmission periods, multiplexing the plurality of tile groups on the basis of the periods of the plurality of classes and the information on the number of the plurality of tiles to create a multiplexed tile group for each of feedback periods according to the periods of the plurality of classes, and transmitting
  • Another exemplary embodiment of the present invention provides a method of transmitting feedback information.
  • the method includes receiving channel allocation information that includes classification information for classifying a plurality of payloads corresponding to feedback information into a plurality of classes, information on a plurality of transmission periods corresponding to each of the plurality of payloads, information on the number of a plurality of tiles corresponding to each of the plurality of classes, and bitmap information indicating locations of the tiles, creating the plurality of payloads for the plurality of transmission periods, multiplexing the plurality of payloads for the plurality of classes in accordance with the classification information, the information on the plurality of transmission periods, and the information on the number of the plurality of tiles that are included in the channel allocation information, to created a plurality of tile groups corresponding to each of the plurality of classes for periods of the plurality of classes according to the plurality of transmission periods, multiplexing the plurality of tile groups on the basis of the periods of the plurality of classes and the information on the number of the plurality of tiles to created a
  • the method may further include applying a channel code to the multiplexed tile group, transmitting the multiplexed tile group to which the channel code is applied to the base station through a portion of tiles of the feedback zone according to the bitmap information in the feedback zone of the frame that corresponds to the feedback periods, the plurality of payloads including a non-periodic payload in which a value indicating a transmission period is not constant wherein a class to which the non-periodic payload belongs is a non-periodic class, performing block coding on the non-periodic payload so as to create a non-periodic codeword, performing orthogonal modulation on the non-periodic codeword according to the information on the number of tiles corresponding to the non-periodic class so as to create a non-periodic tile group, applying an additional channel code that is obtained by performing conjugation or symbol inversion on the channel code to the non-periodic tile group, and transmitting the non- periodic tile group to which the additional channel code is applied to the base station
  • Yet another exemplary embodiment of the present invention provides a method of transmitting feedback information.
  • the method includes receiving channel allocation information that includes classification information for classifying a plurality of payloads corresponding to feedback information into a plurality of classes, information on a plurality of transmission periods corresponding to each of the plurality of payloads, and information on the number of a plurality of tiles corresponding to each of the plurality of classes, creating the plurality of payloads for the plurality of transmission periods, multiplexing the plurality of payloads for each of the plurality of classes in accordance with the classification information, the information on the plurality of transmission periods, and the information on the number of the plurality of tiles that are included in the channel allocation information, to created a plurality of tile groups corresponding to each of the plurality of classes for periods of the plurality of classes according to the plurality of transmission periods, multiplexing the plurality of tile groups on the basis of the periods of the plurality of classes and the information on the number of the plurality of tiles to created a multiplexed tile group for
  • the method may further include performing block coding on a non-periodic payload so as to create a non-periodic codeword, the plurality of payloads including the non- periodic payload in which a value indicating a transmission period is not constant, a class to which the non-periodic payload belongs being a non-periodic class, performing orthogonal modulation on the non-periodic codeword in accordance with the information on the number of tiles that corresponds to the non-periodic class to created a non-periodic tile group, applying an additional channel code that is obtained by performing conjugation or symbol inversion on the channel code to the non-periodic tile group, and transmitting the non-periodic tile group to which the additional channel code is applied to the base station through the feedback zone of the frame that corresponds to the feedback periods.
  • the method may further include setting a transmission power for each of the plurality of classes according to information on a plurality of transmission powers.
  • the channel allocation information may further include the information on the plurality of transmission powers that correspond to each of the plurality of classes.
  • the multiplexing of the plurality of payloads may further include multiplexing the plurality of payloads for each of the plurality of classes according to the classification information, to created a plurality of multiplexing payloads corresponding to each of the plurality of classes for periods of the plurality of classes, performing block coding on each of the plurality of multiplexing payloads so as to create a plurality of codewords, and performing orthogonal modulation on each of the plurality of codewords in accordance with the information on the number of the plurality of tiles so as to create a plurality of tile groups.
  • the method may further include determining each of the periods of the plurality of classes as a minimum value among transmission periods of at least one of the payloads that belong to each of the plurality of classes.
  • the multiplexing of each of the plurality of classes may further include determining the number of bits by which each payload belonging to each class is to be transmitted for each period of each class on the basis of a transmission period of at least one of the payloads belonging to each class and a period of each class, and merging bits corresponding to the number of bits of each payload among one or more bits constituting each payload belonging to each class for each class to created a multiplexed payload.
  • the number of bits may be determined by a ratio between a transmission period of at least one of the payloads belonging to each class and a period of each class.
  • the method may further include determining the feedback period as a minimum value among the periods of the plurality of classes.
  • the creating of the multiplexed tile group may include determining the number of tiles used by each tile group for each feedback period on the basis of a period of each class and the information on the number of tiles for each class, and merging tiles corresponding to the number of tiles used by each tile group among tiles constituting each tile group for each feedback period so as to create the multiplexed tile group for each feedback period.
  • the number of tiles may be determined by a ratio between a period of each class and the feedback period.
  • the feedback zone may include a plurality of tiles, and each tile may include a plurality of symbols on a time axis and a plurality of subcarriers on a frequency axis.
  • FIG. 1 is a view illustrating an uplink feedback channel according to an exemplary embodiment of the present invention.
  • FIG. 2 is a view illustrating a feedback zone of an uplink frame according to an exemplary embodiment of the present invention.
  • FIG. 3 is a view illustrating frequency/time multiplexing for feedback channels of a plurality of mobile terminals according to an exemplary embodiment of the present invention.
  • FIG. 4 is a view illustrating feedback channel allocation information in a case of performing frequency/time multiplexing according to an exemplary embodiment of the present invention.
  • FIG. 5 is a view illustrating a case where a plurality of mobile terminals according to an exemplary embodiment of the present invention perform code multiplexing on feedback channels.
  • FIG. 6 is a view illustrating feedback channel allocation information in a case of performing code multiplexing according to an exemplary embodiment of the present invention.
  • FIG. 7 is a block diagram illustrating a mobile terminal according to an exemplary embodiment of the present invention.
  • FIG. 8 is a flowchart illustrating a method in which a mobile terminal according to an exemplary embodiment of the present invention transmits a plurality of pay loads.
  • FIG. 9 is a flowchart illustrating a process in which a bit level multiplexing unit according to an exemplary embodiment of the present invention creates one multiplexing payload.
  • FIG. 9 is a flowchart illustrating a process in which a bit level multiplexing unit according to an exemplary embodiment of the present invention creates one multiplexing payload.
  • FIG. 10 is a flowchart illustrating a process in which a tile multiplexer according to an exemplary embodiment of the present invention creates a tile multiplexing symbol.
  • FIG. 11 is a flowchart illustrating a method in which a mobile terminal according to an exemplary embodiment of the present invention transmits a non-periodic payload.
  • FIG. 12 is a view illustrating a method in which a mobile terminal according to an exemplary embodiment of the present invention transmits a non-periodic payload through an additional feedback channel.
  • FIG. 1 is a view illustrating an uplink feedback channel according to an exemplary embodiment of the present invention.
  • a base station allocates a part of a radio resource of an uplink frame 10, which includes a plurality of subchannels on a frequency axis and a plurality of OFDM symbols on a time axis, to a feedback zone 11 for a feedback channel 13.
  • the feedback zone 11 is divided into a plurality of feedback channels 13, each feedback channel 13 includes six tiles 15, and each tile 15 includes four subcarriers and three symbols.
  • the base station transmits feedback channel allocation information, which includes an index and a report period of a feedback channel 13 used by each mobile terminal, to each mobile terminal through a map, and allocates the feedback channel 13 to each mobile terminal. At this time, when a large amount of feedback information is fed back, the base station allocates the plurality of feedback channels 13 to one mobile terminal.
  • Each mobile terminal transmits the feedback information to the base station by using the feedback channels that are allocated to each mobile terminal.
  • the feedback information is represented by a feedback pay load (hereinafter, referred to as "pay load") 21 that is composed of a plurality of bits. In the standard of IEEE 802.16, the payload 21 may be composed of 6 bits.
  • the mobile terminal performs block coding on the payload 21 to be transmitted so as to create a codeword 23 that is composed of six symbols.
  • the mobile terminal transmits them through the six tiles 15 that constitute each of the feedback channels allocated to each mobile terminal.
  • the mobile terminal represents various types of feedback information according to the contents of a sequence of bits that constitute the payload. For example, when a first bit is 0 in the payload that is composed of 6 bits, the remaining 5 bits may represent channel quality information (Channel Quality Indication, CQI), and when the first bit is 1, the remaining 5 bits may represent feedback information other than the CQI according to the contents of the remaining 5 bits. Accordingly, if necessary, instead of the channel quality information, a command requiring changing a multiple antenna transmission method, channel status information for multiple antenna transmissions, or antenna weight value information may be transmitted through the allocated feedback channels. Further, when a base station selection index is transmitted to perform highspeed handoff, one of eight different bit sequences, in which the first bit is 1, may be selected to represent the corresponding base station.
  • CQI Channel Quality Indication
  • FIG. 2 is a view illustrating a feedback zone of an uplink frame according to an exemplary embodiment of the present invention.
  • the base station designates a feedback zone 110 for a feedback channel in an uplink frame (UL frame) 100 through a broadcasting channel or a map transmitted in a downlink frame.
  • the base station may transmit a message including feedback channel allocation information to the mobile terminal by using a downlink data burst or transmit a map in which the feedback channel allocation information is included, thereby allocating the feedback channels.
  • the feedback zone 110 may be included in all of the uplink frames 100, or in order to reduce an overhead that is occupied by the feedback zone 110, intervals of the uplink frames 100 that include the feedback zone 110 may become several uplink frames 100.
  • one feedback zone 110 exists per T FB uplink frames 100.
  • the uplink frames 100 including the feedback zone 110 are defined at intervals of several uplink frames 100, a minimum period of the feedback channels that are allocated to each mobile terminal is limited to a period of the uplink frames 100 included in the feedback zone 110.
  • the feedback zone 110 includes N tiles 130, and each tile includes N continuous zone sub sub sub subcarriers on a frequency axis and N continuous OFDM symbols in a time domain. sym
  • a structure of the tiles 130 that constitute the feedback zone 110 may be the same as or different from a structure of tiles for transmitting an uplink data burst. Since the detailed structure of the tile departs from the scope of the present invention, the description thereof will be omitted.
  • FIG. 3 is a view illustrating frequency/time multiplexing for feedback channels of a plurality of mobile terminals according to an exemplary embodiment of the present invention.
  • the N zone tiles in the feedback zone 110 are divided into a plurality of feedback channels for a plurality of mobile terminals and are allocated to each mobile terminal. That is, the feedback channels that are allocated to each mobile terminal are discriminated by using different tiles 130 in the feedback zone 110. At this time, the number of tiles that are used in the feedback channels allocated to each mobile terminal may be changed according to a channel condition of each mobile terminal and an amount of feedback information required. According to the channel condition of each mobile terminal and the amount of feedback information required, the base station adjusts the number of tiles used with respect to a payload per bit of the payload and transmission power of the feedback channels.
  • a feedback channel that is allocated to a certain mobile terminal User U includes N
  • the tiles 130 that are allocated to each user are continuous.
  • the tiles 130 shown in FIG. 3 mean logical tiles, and when the logical tiles are mapped as physical tiles actually transmitted in the uplink frame 100, the continuous logical tiles may be mapped such that they are separated from one another on the frequency and time axes. At this time, the mapping may be different according to a sector number and a frame number. Since a detailed process of mapping the tiles departs from the scope of the present invention, the description thereof will be omitted.
  • the base station transmits a feedback channel allocation message or a map in which the feedback channel allocation information is included to the mobile terminal requiring the feedback channel, and allocates the feedback channel to the mobile terminal.
  • FIG. 4 is a view illustrating feedback channel allocation information in a case of performing frequency/time multiplexing according to an exemplary embodiment of the present invention.
  • feedback channel allocation information PlOO includes a number of an uplink frame where the feedback channel starts PlOl, the number of pay load classes P 103, at least one of the payload class information P105, and a bit map that informs the locations of tiles 130 that are used for the feedback channels Pl 19.
  • the payload class information P 105 includes a power offset that is used for each payload class P 107, the number of tiles that are to be used for each payload class P109, the number of payloads that are to be multiplexed with each payload class Pi l l, and payload information Pl 13 that belongs to each payload class.
  • the payload information Pl 13 includes types of payloads Pl 15 that belong to each payload class and feedback periods Pl 17 of payloads that belong to each payload class.
  • the base station allocates one feedback channel to each mobile terminal, and each mobile terminal multiplexes various types of payloads and transmits them to the base station.
  • a feedback channel that is allocated to a certain mobile terminal may include at least one of the payload classes, and each payload class may include at least one of the payloads.
  • the payloads that are multiplexed with one payload class are determined according to the types of payloads Pl 15 of payload information Pl 13. For each type of the payloads Pl 15, the number of bits B that constitute a payload and meaning of the bits are defined in advance.
  • a report period of payloads that are multiplexed with one payload class is defined according to a feedback period T of payloads Pl 17 that are included in the payload information Pl 13, and are multiplexed with one feedback payload class according to a feedback period T of payloads Pl 17 that are multiplexed with one payload class.
  • payloads that need the same process gain and the same transmission power are multiplexed with one payload class. Further, payloads that belong to the same payload class are multiplexed to have the same reception performance, but are multiplexed to have different feedback periods.
  • the payload classes use different tiles 130.
  • the payload classes may be allocated with different transmission power and have different process gains according to the number of tiles allocated.
  • the process gain means the number of subcarriers used for each payload bit. If a payload class feeds F bits back in an uplink frame and is allocated with N tiles according to the number of tiles P 109 included in the feedback channel allocation information PlOO, a process gain PG of the payload class is in accordance with Equation 1. [63] (Equation 1)
  • the mobile terminal determines the transmission power of each payload class on the basis of a power offset of each payload class P107 with respect to a reference transmission power of the feedback channel that is allocated to each mobile terminal. If the reference transmission power of the feedback channel of the mobile terminal is P and the power offset of the
  • the reference transmission power of the feedback channel of the mobile terminal is determined according to open-loop power control or closed-loop power control. Since a method of setting the reference transmission power departs from the scope of the present invention, the detailed description thereof will be omitted.
  • a different process gain and a different transmission power are allocated to each payload class, thereby enabling each payload class to have a different reception performance.
  • channel quality information and a response for an HARQ (Hybrid Automatic Repeat Request) burst may be defined by a different payload class, and a relatively large amount of subcarriers and transmission power per bit may be allocated so as to have a high reception performance with respect to the response for the HARQ burst.
  • HARQ Hybrid Automatic Repeat Request
  • the base station informs locations of the tiles 130, which a feedback channel of a certain mobile terminal uses in the feedback zone 110, through a bit map Pl 19 of the feedback channel allocation information PlOO.
  • the number of bits that constitute the tile bit map Pl 19 is the same as the number of tiles that constitute the feedback zone, and the n-th bit means the n-th tile.
  • a tile number n denotes a number of a logical tile. Even when tiles have continuous numbers, locations of physical tiles that are actually used at the time of transmission may not be continuous, and may be distant from each other on the frequency and time axes.
  • the number of tiles that a feedback channel allocated to a mobile terminal uses corresponds to the number of tiles that are used by all payload classes of the mobile terminal. In order to sequentially transmit the payload classes, the mobile terminal uses tiles that are allocated to the feedback channel according to an order in which the payload classes are defined in the feedback channel allocation information and the number of tiles allocated.
  • FIG. 5 is a view illustrating code multiplexing for feedback channels of a plurality of mobile terminals according to an exemplary embodiment of the present invention.
  • the feedback channels that are allocated to the mobile terminal use all of the N tiles 130 of the feedback zone 110, and each feedback channel is zone discriminated by a scrambling code. According to the channel condition of each mobile terminal and the amount of feedback information required, the base station adjusts the number of tiles used with regard to the feedback payload per bit of the feedback payload and transmission power of the feedback channels.
  • FIG. 6 is a view illustrating feedback channel allocation information in a case of performing code multiplexing according to an exemplary embodiment of the present invention.
  • feedback channel allocation information P200 when performing code multiplexing, includes a number of an uplink frame where a feedback channel starts PlOl, the number of payload classes P103, and at least one of the payload class information P105.
  • the payload class information P105 includes a power offset that is used for each payload class P 107, the number of tiles that are to be used for each payload class P109, the number of payloads that are to be multiplexed with each payload class Pi l l, and payload information that belongs to each payload class Pl 13.
  • the payload information Pl 13 includes types of payloads Pl 15 that belong to each payload class and feedback periods of payloads Pl 17 that belong to each payload class.
  • FIG. 7 is a block diagram illustrating a mobile terminal according to an exemplary embodiment of the present invention.
  • a mobile terminal 300 includes a feedback channel allocation information receiving unit 301, a pay load generator 303, a bit level multiplexer 305, a block coding unit 307, an orthogonal modulating unit 309, a tile multiplexer 311, a tile permutating unit 313, a scrambling unit 315, and a transmitting unit 317.
  • the feedback channel allocation information receiving unit 301 receives the feedback channel allocation information PlOO from the base station.
  • the payload generator 303 generates a plurality of payloads that correspond to feedback information according to payload information Pl 13 of the feedback channel allocation information PlOO.
  • the bit level multiplexer 305 multiplexes the plurality of payloads that are generated by the payload generator 303 according to payload class information P 105, and generates at least one multiplexing payload.
  • the block coding unit 307 converts at least one multiplexing payload and creates at least one codeword.
  • the orthogonal modulating unit 309 performs orthogonal modulation on at least one codeword and generates at least one orthogonally modulated codeword.
  • the tile multiplexer 311 performs multiplexing such that at least one orthogonally modulated codeword is transmitted over at least one frame, and creates tile multiplexing symbols for each feedback period.
  • FIG. 8 is a flowchart illustrating a method in which a mobile terminal according to an exemplary embodiment of the present invention transmits a plurality of payloads. [94] As shown in FIG. 8, first, the feedback channel allocation information receiving unit
  • the payload generator 303 of the mobile terminal 300 creates a plurality of pay loads that correspond to types of pay loads Pl 15 for each of feedback periods of the pay loads Pl 17 in accordance with the payload information Pl 13 of the feedback channel allocation information PlOO (Step SI lO).
  • the bit level multiplexer 305 of the mobile terminal 300 performs bit level multiplexing on at least one of payloads that belong to each payload class for each payload class, and creates at least one of multiplexing payloads that corresponds to at least one of payload classes (Step S 120).
  • the bit level multiplexer 305 performs bit level multiplexing on the basis of a feedback period T of each payload Pl 17 and a bit c,t length B of each payload.
  • the feedback period T of each payload Pl 17 is defined c,t c,t by the feedback channel allocation information PlOO in advance, and the bit length B c,t of each payload is defined in advance according to a type PL of each payload Pl 15.
  • FIG. 9 is a flowchart illustrating a process in which a bit level multiplexer according to an exemplary embodiment of the present invention creates one multiplexing payload.
  • the bit level multiplexer 305 determines a period T of a payload class c (Step S 121). At this time, the period T of the payload class may have a minimum value among feedback periods T of payloads that belong to a payload class.
  • T of a payload PL is four frames, and a feedback period T of a payload PL is six c,2 c,2 c,3 c,3 frames, the bit level multiplexer 305 determines a period T of a payload class (payload class c) as two frames according to the feedback period T of the payload PL .
  • the bit level multiplexer 305 determines the number of bits F that each of the payloads belonging to the payload class transmits for each period of the payload class (Step S 123). At this time, the number of bits F is in accordance with Equation 3. [101] (Equation 3)
  • the corresponding payload class is composed of a single type of payload. That is, a period of the payload class becomes a feedback period of the single payload, and a multiplexing payload of the payload class becomes the single payload.
  • the base station When the base station allocates a feedback channel to a certain mobile terminal 300, the base station can set types PL of pay loads Pl 15 belonging to the payload class and a feedback period T of the pay loads Pl 17 such that the number of bits F becomes a c,t c,t natural number. Further, when it is difficult for the base station to allocate the number of bits F such that the number of bits F becomes a natural number, the base station c,t c,t can define the corresponding payload as an independent payload class. At this time, the base station may allocate the number of bits F such the number of bits F does not c,t c,t become a natural number. In this case, the bit level multiplexer 305 may add '0' bits of DB to the rear side of the bits that constitute the payload. The number of added bits DB is in accordance with Equation 4. [106] (Equation 4)
  • M c , ⁇ BJJT c , )F c IT e , -B c ,
  • the bit level multiplexer 305 may add '0' bits of DB to the payload of which the number of bits is B so as to extend the corresponding payload to a payload composed of B ' bits, and then perform bit level multiplexing on the extended payload. At this time, the number of bits B 'in the extended payload is in accordance with Equation 5.
  • the bit level multiplexer 305 merges bits corresponding to the number of bits F of each payload among bits constituting each payload, and creates one multiplexing payload for each period T of the payload class (Step S 125).
  • the bit level multiplexer 305 merges 4 (F ) bits PL (n) among 4 (B ) bits of the payload PL , 2 (F ) bits PL (n) among 4 (B ) bits of the c,l c,l c,2 c,2 c,2 payload PL c, 2 , and 1 (F c,3 ) bit PL c,3 (n) among 3 (B c, 3 ) bits of the payload PL c, 3.
  • the second frame in the second frame
  • bit level multiplexing unit 305 merges 4 (F ) bits PL (n+1) among
  • the bit level multiplexer 305 performs multiplexing such that B bits constituting each payload PL belonging to a payload class c,t c,t are transmitted over a frame that corresponds to a feedback period T of each payload.
  • Equation 6 the length F of a bit sequence of a multiplexing payload for a payload class is in accordance with Equation 6. [115] (Equation 6)
  • the base station can reconstruct the payloads that belong to the payload class, on the basis of the feedback channel allocation information PlOO. That is, the base station can restore the payloads in a reverse process of a bit level multiplexing process of the payload class in the mobile terminal 300.
  • a mobile terminal 300 transmits feedback information to a base station.
  • the block coding unit 307 of the mobile terminal 300 performs block coding on each multiplexing payload of at least one of multiplexing payloads according to the contents and length F of a bit sequence constituting each multiplexing payload, and creates at least one codeword that corresponds to at least one multiplexing payload (Step S 130).
  • the number of symbols that constitute the codeword is the same as the number of tiles N that are allocated for the corresponding payload class P109.
  • Each symbol of the codeword may be one of N N different symbols, and the number of sub sym types N N that can be represented by each symbol is the same as the number of sub sym subcarriers N N that constitute one tile 130.
  • the block coding unit 307 can create sub sym the codeword by using a table illustrating a mapping relationship between the bit sequence of the multiplexing payload and the codeword. For this reason, it is required to prepare a table in which the length of each bit sequence is defined in advance. [120] Then, the orthogonal modulating unit 309 of the mobile terminal 300 individually performs orthogonal modulation on each codeword, and creates at least one orthogonal modulation codeword that corresponds to at least one codeword (Step S 140).
  • each symbol constituting each codeword is converted into one of L Discrete Fourier Transform (DFT) codes composed of L chips such that each symbol is transmitted through one tile 130.
  • DFT codes that correspond to contents of symbols of the codewords are defined in advance, and a j-th chip m of the i-th DFT code among the DFT codes is in accordance with Equation 7. [121] (Equation 7)
  • A denotes amplitude of a DFT code chip
  • L N sub N sym
  • the different payload classes use different tiles, and are sequentially transmitted through the tiles that are allocated to the payload classes according to an order that is indicated by the feedback channel allocation information PlOO in N tiles that
  • FB,u correspond to the feedback channels allocated to the mobile terminals.
  • the tile multiplexer 311 of the mobile terminal 300 performs tile multiplexing on at least one of orthogonal modulation codewords, and creates tile multiplexing symbols (Step S 150).
  • the tile multiplexer 311 performs tile multiplexing on the basis of a period T of each payload class and the number of tiles N in each payload class.
  • FIG. 10 is a flowchart illustrating a process in which a tile multiplexer according to an exemplary embodiment of the present invention creates a tile multiplexing symbol.
  • the block coding unit 307 performs block coding on a multiplexing payload of 1 bit (F ) corresponding to a payload class PLC and converts it into a codeword composed of 8 (N ) symbols, and performs block coding on a multiplexing payload of 7 bits (F ) corresponding to the payload class PLC and converts it into a codeword composed of 40 (N ) symbols (Step S 130).
  • the orthogonal modulating unit 309 modulates a codeword composed of 8 (N ) symbols with a DFT code so as to create an orthogonal modulation symbol composed of 8 (N ) tiles, and modulates a codeword composed of 40 (N ) symbols with the DFT code so as to create an orthogonal modulation symbol composed of 40 (N ) tiles (Step S 140).
  • the tile multiplexer 311 determines a period T of a feedback channel that is allocated to the mobile terminal 300 (Step S 151). At this time, the period T of the feedback channels may have a minimum value among periods T of payload classes.
  • the tile multiplexer 311 determines the period T of the feedback channel as two frames according to the period T of the payload class
  • the number of tiles X in the payload class PLC is eight, and the number of tiles X in the payload class PLC is twenty.
  • the base station when the base station allocates a feedback channel to the mobile terminal 300, the base station can set the number of tiles N in each payload class and a period T of each payload class such that the number of tiles X becomes a natural number.
  • the base station may allocate the number of tiles X such that the number of tiles X does not become a natural number.
  • the tile multiplexer 311 may add DN tiles to N tiles. At this time, the number of added tiles DN is in accordance with Equation 9. [141] (Equation 9)
  • the tile multiplexer 311 merges tiles corresponding to the number of tiles X in each payload class among tiles constituting each orthogonal modulation codeword, and creates a tile multiplexing symbol for each period T of a feedback channel (Step S 155).
  • the tile multiplexing unit 311 merges 8 (X ) tiles PLC (n) among orthogonal modulation symbols that are composed of 8 (N ) tiles, and 20 (X ) tiles PLC (n) among orthogonal modulation symbols that are composed of 40 (N ) tiles.
  • the tile multiplexer 311 merges 8 (X ) tiles PLC (n+1) among orthogonal modulation symbols that are composed of 8 (N ) tiles and 20 (X ) tiles PLC (n) among orthogonal modulation symbols that are composed of 40 (N ) tiles.
  • the 8 (X ) tiles PLC (n) that are merged with the first frame (Frame m) are different from the 8 (X ) tiles PLC (n+1) that are merged with the second frame (Frame m+T).
  • the 20 (X ) tiles PLC (n) that are merged with the first frame (Frame m) and the 20 (X ) tiles PLC (n) that are merged with the second frame (Frame m+T) are summed, which becomes orthogonal modulation symbols that are composed of 40 (N ) tiles.
  • the tile multiplexer 311 performs multiplexing such that N tiles constituting orthogonal modulation symbols of each payload class PLC are transmitted during a period of each payload class PLC .
  • the tile multiplexer 311 may set a transmission power with respect to each payload class PLC . If the tile multiplexer 311 sets a transmission power of an orthogonal modulation symbol that corresponds to each payload class PLC , the tile multiplexer
  • the tile multiplexer 311 can set a transmission power for each payload class PLC .
  • the tile multiplexer 311 determines a transmission power for each payload class PLC on the basis of a power offset P 107 of feedback channel allocation information PlOO.
  • a transmission power P for each payload class PLC is in accordance with Equation 2.
  • a mobile terminal 300 transmits feedback information to a base station.
  • the tile permutating unit 313 of the mobile terminal 300 performs tile permutation such that an order of multiplexed tiles of tile multiplexing symbols is changed, and creates tile permutation symbols (Step S 160). Through this process, the tile permutating unit 313 causes continuous logical tiles of the tile multiplexing symbols to be mapped with physical tiles that are distant from one another.
  • the scrambling unit 315 of the mobile terminal 300 scrambles the tile permutation symbols and creates channel code applying symbols (Step S 170).
  • the scrambling unit 315 can apply a scrambling code corresponding to a channel code of the feedback channel allocated to the mobile terminal 300 to the tile permutation symbol so as to create a channel code applying symbol.
  • a plurality of mobile terminals 300 performs frequency/time multiplexing on a pay load according to the feedback channel allocation information PlOO, a plurality of feedback channels that are allocated to the plurality of mobile terminals use different tiles in an entire feedback zone, and thus are discriminated from one another.
  • the plurality of mobile terminals 300 that are allocated with the feedback channels included in the same feedback zone 110 can use the same scrambling codes.
  • Each of the scrambling codes may be defined in advance by an ID of a corresponding sector, a frame number, an OFDM symbol number, and the like.
  • the plurality of mobile terminals 300 When the plurality of mobile terminals 300 perform code division multiplexing on a payload according to the feedback channel allocation information P200, the plurality of feedback channels that are allocated to the plurality of mobile terminals 300 use the same tiles 130 in the feedback zone 110. In order to discriminate the feedback channels of the plurality of mobile terminals 300, the plurality of mobile terminals 300 may use different scrambling codes. Each of the scrambling codes may be defined in advance by an ID of a corresponding sector, a frame number, an OFDM symbol number, an ID allocated to the mobile terminal, an ID of the feedback channel, and the like.
  • the transmitting unit 317 of the mobile terminal 300 transmits a channel code applying symbol to the base station through the feedback zone 110 of the uplink frame 100 for each period T of the feedback channel (Step S 180).
  • the transmitting unit 317 can set a frame number from which the feedback channel starts according to an uplink frame number PlOl of the feedback channel allocation information PlOO.
  • the transmitting unit 317 can transmit each of channel code applying symbols through tiles corresponding to a bit map Pl 19 of the feedback channel allocation information PlOO.
  • the transmitting unit 317 can transmit the channel code applying symbols by using all the tiles 130 of the feedback zone 110.
  • FIG. 11 is a flowchart illustrating a method in which a mobile terminal according to an exemplary embodiment of the present invention transmits a non-periodic payload.
  • the base station can allow the mobile terminal 300 to use an intermittently transmitted additional feedback channel instead of a periodic feedback channel with respect to feedback information in which feedback that is not periodic but intermittent is required.
  • the base station can allow the mobile terminal 300 to transmit non-periodic feedback information.
  • the base station defines a type of a specific pay load Pl 15 as a non-periodic pay load in advance, and defines the specific payload class of the feedback channel allocation information PlOO such that the specific payload class includes the non-periodic payload.
  • the base station defines a power offset P107 for a payload class including the non-periodic payload, and a feedback period Pl 17 of the non-periodic payload.
  • the feedback period that is defined for the non-periodic payload does not mean a periodic feedback period but a restriction in a maximum reporting ratio in which the non-periodic payload can be transmitted. For example, when a feedback period of 10 frames is defined with respect to the non-periodic payload in the feedback channel allocation information PlOO, it means that the corresponding non-periodic payload cannot be transmitted at intervals that are smaller than 10 frames. This restriction is used to restrict an increase in interference due to the non-periodic payload transmission.
  • the feedback channel allocation information receiving unit 301 of the mobile terminal 300 receives the feedback channel allocation information PlOO from the base station (Step S300).
  • the payload generator 303 of the mobile terminal 300 creates a non-periodic payload corresponding to a type of a specific payload Pl 15 on the basis of a feedback period Pl 17 of the non-periodic payload (Step S310).
  • the block coding unit 307 of the mobile terminal 300 performs block coding and creates a non-periodic codeword that corresponds to the non-periodic payload (Step S320).
  • the non-periodic codeword is composed of N symbols according to the number of tiles P109 in the payload class PLC to which the non-periodic payload belongs.
  • the orthogonal modulating unit 309 of the mobile terminal 300 performs orthogonal modulation on the non-periodic codeword, and creates a non-periodic orthogonal modulation codeword that corresponds to the non-periodic codeword (Step S330).
  • the non-periodic orthogonal modulation codeword is composed of N tiles.
  • the tile permutating unit 313 of the mobile terminal 300 performs tile permutation such that an order of tiles of the non-periodic orthogonal modulation codeword is changed, and creates a non-periodic tile permutation symbol (Step S340).
  • the scrambling unit 315 of the mobile terminal 300 scrambles the non-periodic tile permutation symbol and creates an additional channel code applying symbol (Step S350).
  • the scrambling unit 315 can apply a scrambling code corresponding to a channel code of the additional feedback channel allocated to the mobile terminal 300 to the non-periodic tile permutation symbol and create an additional channel code applying symbol.
  • the scrambling unit 315 can apply a code, which is obtained by performing conjugation or symbol inversion on a scrambling code used for a basic feedback channel, to a non-periodic tile permutation symbol, such that the non- periodic payload is transmitted through the additional feedback channel. Further, the scrambling unit 315 can use codes that individually correspond to the scrambling codes that are used for the basic feedback channel.
  • the transmitting unit 317 of the mobile terminal 300 transmits the additional channel code applying symbol to the base station through the additional feedback channel (Step S360).
  • FIG. 12 is a view illustrating a method in which a mobile terminal according to an exemplary embodiment of the present invention transmits a non-periodic payload through an additional feedback channel.
  • the mobile terminal 300 when the non-periodic payload needs to be transmitted, the mobile terminal 300 allows the additional feedback channel for the non-periodic payload to use tiles corresponding to the number of tiles allocated to the additional feedback channel, among tiles used by the basic feedback channel in the frame through which the basic feedback channel is transmitted. At this time, the mobile terminal 300 performs code multiplexing on the additional feedback channel and the basic feedback channel through the scrambling code for the additional feedback channel in the same tile as the basic feedback channel.
  • the exemplary embodiment of the present invention that has been described above may be implemented by not only a method and an apparatus but also a program capable of realizing a function corresponding to the structure according to the exemplary embodiment of the present invention and a recording medium having the program recorded therein. It can be understood by those skilled in the art that the implementation can be easily made from the above-described exemplary embodiment of the present invention.
  • the mobile terminal can construct adaptive feedback channels according to a channel condition and an amount of feedback required, and can efficiently use a radio resource for feedback channels.
  • the mobile terminal can efficiently multiplex various feedback payloads that require different feedback periods and reliabilities.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention concerne un terminal mobile transmettant des informations de rétroaction. Le terminal mobile reçoit une information d'affectation de canal contenant des informations de classification, des informations concernant une pluralité de périodes de transmission et des informations concernant le nombre d'une pluralité de pavés. En fonction de l'information d'affectation de canal, le terminal mobile effectue un multiplexage d'une pluralité de données utiles de manière à créer une pluralité de groupes de pavés. Ensuite, le terminal mobile effectue un multiplexage de la pluralité de groupes de pavés sur la base de l'information concernant le nombre de la pluralité de pavés de manière à créer un groupe de pavés multiplexés. Ensuite, le terminal mobile transmet le groupe de pavés multiplexés à une station de base au moyen d'une zone de rétroaction de manière à construire des canaux de rétroaction adaptatifs.
PCT/KR2007/003673 2006-08-10 2007-07-31 Procédé et dispositif de transmission d'informations de rétroaction WO2008018711A2 (fr)

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CN101826952A (zh) * 2009-03-02 2010-09-08 中兴通讯股份有限公司 混合自动重传请求的反馈信道确定方法
CN101826952B (zh) * 2009-03-02 2015-05-13 中兴通讯股份有限公司 混合自动重传请求的反馈信道确定方法
KR101404372B1 (ko) * 2010-02-23 2014-06-09 인텔 코포레이션 와이드 채널 무선 통신을 위한 대역폭 및 채널 통지
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US11533733B2 (en) * 2020-04-28 2022-12-20 Qualcomm Incorporated Payload multiplexing with orthogonal sequences

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