WO2009011513A2 - Procédé d'allocation de ressource radio dans un système de communication sans fil et procédé de transmission ou de réception de données utilisant un tel procédé - Google Patents

Procédé d'allocation de ressource radio dans un système de communication sans fil et procédé de transmission ou de réception de données utilisant un tel procédé Download PDF

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Publication number
WO2009011513A2
WO2009011513A2 PCT/KR2008/004045 KR2008004045W WO2009011513A2 WO 2009011513 A2 WO2009011513 A2 WO 2009011513A2 KR 2008004045 W KR2008004045 W KR 2008004045W WO 2009011513 A2 WO2009011513 A2 WO 2009011513A2
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WO
WIPO (PCT)
Prior art keywords
resource
region
allocated
regions
radio resource
Prior art date
Application number
PCT/KR2008/004045
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English (en)
Other versions
WO2009011513A3 (fr
Inventor
Wook Bong Lee
Bin Chul Ihm
Ki Seon Ryu
Original Assignee
Lg Electronics Inc.
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.)
Filing date
Publication date
Priority claimed from KR1020070111979A external-priority patent/KR101438220B1/ko
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to US12/452,615 priority Critical patent/US8243668B2/en
Publication of WO2009011513A2 publication Critical patent/WO2009011513A2/fr
Publication of WO2009011513A3 publication Critical patent/WO2009011513A3/fr

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Classifications

    • 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
    • H04L5/0001—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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to wireless communications, and more particularly, to a method for allocating a radio resource in a wireless communication system.
  • Wireless communication systems are widely used to provide various types of communications. For example, voice and/or data are provided by the wireless communication systems.
  • a conventional wireless communication system provides multiple users with one or more shared resources.
  • the wireless communication system can use various multiple access schemes such as code division multiple access (CDMA), time division multiple access (TDMA), and frequency division multiple access (FDMA).
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • An orthogonal frequency division multiplexing (OFDM) scheme uses a plurality of orthogonal sub-carriers. Further, the OFDM scheme uses an orthogonality between inverse fast Fourier transform (IFFT) and fast Fourier transform (FFT).
  • IFFT inverse fast Fourier transform
  • FFT fast Fourier transform
  • a transmitter transmits data by performing IFFT.
  • a receiver restores original data by performing FFT on a received signal.
  • the transmitter uses IFFT to combine the plurality of sub- carriers, and the receiver uses FFT to split the plurality of sub-carriers.
  • complexity of the receiver can be reduced in a frequency selective fading environment of a broadband channel, and spectral efficiency can be improved through selective scheduling in a frequency domain by utilizing channel characteristics which are different from one subcarrier to another.
  • OFDMA orthogonal frequency division multiple access
  • An orthogonal frequency division multiple access (OFDMA) scheme is an OFDM-based multiple access scheme. According to the OFDMA scheme, a radio resource can be
  • the wireless communication system employs one or more base stations (BSs) having a coverage area.
  • BSs base stations
  • a typical BS can transmit multiple data streams for broadcast, multicast, and/or unicast services.
  • the data stream denotes a stream of data that can be independently received by a user equipment (UE).
  • UE user equipment
  • the UE can also transmit the data stream to the BS or another UE.
  • downlink is defined as transmission from the BS to the UE
  • uplink is defined as transmission from the UE to the BS.
  • the BS schedules radio resources.
  • An uplink resource is a radio resource transmitted in uplink.
  • a downlink resource is a radio resource transmitted in downlink.
  • the BS informs the UE of the downlink resource allocated to the data stream, and the UE receives the data stream through the downlink resource.
  • the BS informs the UE of the uplink resource allocated to the data stream, and the UE transmits the data stream through the uplink resource.
  • Radio resource allocation information has to be occasionally transmitted to the UE.
  • the radio resource allocation information is a control signal.
  • the radio resource is transmitted through a dedicated control channel or a common control channel.
  • the dedicated control channel denotes a control channel for at least one specific UE.
  • the common control channel denotes a control channel for all UEs in the coverage area.
  • the radio resource may be allocated in a different size according to an amount of data streams to be transmitted, a channel condition, or a quality of service (QoS).
  • QoS quality of service
  • the radio resources need to be ad- aptively allocated for data streams which change variously.
  • the present invention provides a resource allocation method for adaptively allocating a radio resource to improve efficiency of the radio resource and a method for transmitting or receiving data by using the resource allocation method.
  • a method for allocating a radio resource in a wireless communication system comprises defining a plurality of resource regions within a frame, a resource region comprising at least one orthogonal frequency division multiple access (OFDMA) symbol and at least one subchannel, configuring radio resource allocation information indicating which resource region selected from the plurality of resource regions is allocated to a UE, the radio resource allocation information comprising at least one resource region identifier (ID), a resource region ID indicating a resource region selected from the plurality of resource regions, and transmitting the radio resource allocation information to the UE.
  • OFDMA orthogonal frequency division multiple access
  • a method for transmitting or receiving data by using a resource region including at least one OFDMA symbol and at least one subchannel comprises receiving radio resource allocation information comprising at least one resource region ID, a resource region ID indicating the resource region selected from a plurality of resource regions, the plurality of resource regions is included in a permutation zone and is defined in information of the permutation zone, and transmitting or receiving data through the resource region.
  • a resource region of a frame can be adaptively divided so that data streams with various sizes can be effectively allocated. Therefore, limited radio resources can be effectively used.
  • FIG. 1 shows a wireless communication system.
  • FIG. 2 shows an example of a frame.
  • FIG. 3 shows an example of radio resource allocation using the frame of FIG. 2.
  • FIG. 4 shows another example of radio resource allocation using the frame of FIG. 2.
  • FIG. 5 shows another example of a frame.
  • FIG. 6 shows an example of radio resource allocation using the frame of FIG. 5.
  • FIG. 7 shows an example of radio resource allocation using the frame of FIG. 5 according to an embodiment of the present invention.
  • FIG. 8 shows an example of radio resource allocation using the frame of FIG. 5 according to another embodiment of the present invention.
  • FIG. 9 shows a frame structure for explaining a method for allocating a radio resource according to an embodiment of the present invention.
  • FIG. 10 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 11 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 12 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 30 FIG.
  • FIG. 13 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 14 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 15 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 16 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 17 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 18 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 19 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 20 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 21 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • FIG. 1 shows a wireless communication system.
  • the wireless communication system can be widely deployed to provide a variety of communication services, such as voices, packet data, etc.
  • the wireless communication system includes a base station (BS)
  • the UE 10 may be fixed or mobile, and may be referred to as another terminology, such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, etc.
  • the BS 20 is generally a fixed station that communicates with the UE 10 and may be referred to as another terminology, such as a node-B, a base transceiver system (BTS), an access point, etc. There are one or more cells within the coverage of the BS 20.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • an uplink frame denotes a frame in uplink transmission and a downlink frame denotes a frame in downlink transmission.
  • a frame may include an uplink frame and a downlink frame.
  • the frame may use a time division duplex (TDD) scheme in which the uplink frame and the downlink frame is transmitted at different time or may use a frequency division duplex (FDD) scheme in which the uplink frame and the downlink frame is transmitted by using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • FIG. 2 shows an example of a frame.
  • a horizontal axis represents an OFDMA symbol index in a time domain
  • a vertical axis represents a subchannel index in a frequency domain.
  • a subchannel is a basic unit for dividing a frequency resource and includes a plurality of subcarriers.
  • the frame includes a plurality of OFDMA symbols in the time domain and a plurality of subcarriers in the frequency domain.
  • a transmission time interval (TTI) represents a time required for transmitting one frame.
  • one frame includes N+l OFDMA symbols and K+l subchannels, where N and K are arbitrary natural numbers.
  • N and K are arbitrary natural numbers.
  • the OFDMA symbol index and the subchannel index may change variously.
  • At least one resource element can be allocated on a grid in one 2-dimensional frame.
  • the resource element is a minimum basic unit of a radio resource that can be allocated to the UE.
  • the resource element may include one OFDMA symbol and one subchannel.
  • the resource element has a constant size within one frame, and a BS allocates the resource element to the UE by varying the number of resource elements.
  • radio resource allocation information may include offsets and the number of resource elements.
  • the UE can know the radio resource allocated to the UE.
  • the offset is a value indicating a start location of the allocated radio resource.
  • the radio resource allocation information for allocating the radio resource to the UE can be defined as shown in Table 1 below. [50] Table 1 [Table 1] [Table ]
  • 'OFDMA symbol offset' denotes an OFDMA symbol index at which allocation starts.
  • Subchannel offset' denotes a subchannel index at which allocation starts.
  • 'Number of OFDMA symbols' denotes the number of allocated OFDMA symbols.
  • 'Number of subchannels' denotes the number of allocated subchannels.
  • the name and the number of bits are shown in Table 1 above for exemplary purposes only, and thus the present invention is not limited thereto. The name and the number of bits may vary depending on systems.
  • the BS generates the radio resource allocation information including the offsets and the number of resource elements having a predetermined size.
  • the BS transmits the generated radio resource allocation information to the UE.
  • the radio resource having an arbitrary location and an arbitrary size in one frame, can be allocated to the UE according to the offsets and the number of radio elements.
  • radio resource allocation has a great degree of freedom. That is, the radio resource can be flexibly allocated to the UE according to a size of the required radio resource.
  • a large amount of the radio resource allocation information has to be informed to the UE.
  • the radio resource allocation information is required at least 29 bits in order to inform the radio resource allocated to one UE.
  • FIG. 3 shows an example of radio resource allocation using the frame of FIG. 2.
  • an allocated region Al in the frame is allocated to an arbitrary
  • the allocated region denotes a radio resource allocated to the UE.
  • a size and location of the allocated region Al are shown for exemplary purposes only.
  • the allocated region Al can be represented by a resource element set including at least one resource element.
  • the allocated region Al can be represented by offsets and the number of resource elements.
  • FIG. 4 shows another example of radio resource allocation using the frame of FIG. 2.
  • the frame of FIG. 2 has OFDMA symbol indices 0 to 9 and subchannel indices 0 to 9.
  • a duration may be sequentially assigned to each of a plurality of UEs so as to inform an allocated region. That is, radio resource allocation information can be represented by using only the duration.
  • the duration denotes a resource element or a slot which ranges from a start point, at which the allocated region is initially allocated to the UE, to a last point at which the allocation ends.
  • the slot is a minimum unit for allocating data, and is defined with a time and a subchannel.
  • the definition of slot can vary depending on which permutation is applied.
  • the permutation denotes mapping of a logical subchannel onto a physical subcarrier.
  • Examples of the permutation include full usage of subchannels (FUSC), partial usage of subchannels (PUSC), band-adaptive modulation and coding (AMC), etc.
  • the FUSC denotes a permutation in which each subchannel is mapped to physical subcarriers over the entire bandwidth.
  • the PUSC denotes a permutation in which each physical channel is divided into clusters of 14 subcarriers and each subchannel is mapped to the clusters.
  • the AMC denotes a permutation in which physical subcarriers are grouped into not-overlapping groups of contiguous 9 subcarriers and subchannel is mapped to the group.
  • one slot may be defined with one OFDMA and one subchannel.
  • one slot may be defined with two OFDMA symbols and one subchannel.
  • one slot may be defined with one OFDMA symbol and one subchannel, or two OFDMA symbols and one subchannel, or three OFDMA symbols and one subchannel, or 6 OFDMA symbols and one subchannel.
  • the radio resource allocation information for allocating the radio resource to the UE can be defined as shown in Table 2 below by using only the duration.
  • the name and the number of bits are shown in Table 2 below for exemplary purposes only, and thus may vary depending on the arrangement or the number of resource regions.
  • the allocated region A2_U1 for the first UE Ul includes 10 resource elements.
  • the allocated region A2_U2 for the second UE U2 includes 14 resource elements.
  • the BS may inform the allocated region to the UE by providing offset along with the duration.
  • the allocated region of the second UE U2 is continued from the allocated region of the first UE Ul, and the allocated region of the third UE U3 is continued from the allocated region of the second UE U2. Therefore, except for the offset, only the duration can be provided to the radio resource allocation information.
  • the radio resource allocation information can be informed by representing an offset as a sum of durations. That is, the offset is the sum of previously allocated durations.
  • each UE has to also know radio resource allocation information of other UEs by correctly decoding the information in order to know its radio resource allocation information.
  • a radio resource is allocated first on a time axis according to a duration assigned to a UE
  • the radio resource may be allocated first on a frequency axis.
  • FIG. 5 shows another example of a frame.
  • a horizontal axis represents an OFDMA symbol index in a time domain
  • a vertical axis represents a subchannel index in a frequency domain.
  • the frame includes a plurality of resource regions.
  • the resource region is a basic unit of a radio resource that can be allocated to a UE.
  • the resource region may vary in size within one frame.
  • a definition on the resource region can be informed to the UE through a downlink channel descriptor (DCD) or an uplink channel descriptor (UCD) transmitted through a common control channel.
  • DCD describes a downlink burst profile.
  • UCD describes an uplink burst profile.
  • the resource region can be defined as shown in Table 3 below. [69] Table 3 [Table 3] [Table ]
  • 'Num_region' denotes the number of resource regions.
  • the number of resource regions may be in association with a resource region identifier (ID) which is an identifier for the resource region.
  • ID resource region identifier
  • the name and the number of bits are shown in Table 3 above for exemplary purposes only, and thus the present invention is not limited thereto. The name and the number of bits may vary depending on systems.
  • the resource region may be defined by assigning a slot ID to a slot defined in a specific permutation.
  • Table 4 shows the definition on the slot ID. [72]
  • Table 4 [Table 4] [Table ]
  • the slot ID may be allocated first on either a frequency axis or a time axis.
  • the number of bits for defining the slot ID may vary depending on the number of slots.
  • one frame includes 8 resource regions, and each resource region ID is allocated first on the frequency axis.
  • the number of resource regions and the arrangement of the resource region ID are not limited thereto, and thus can be arbitrarily determined.
  • Radio resource allocation information indicates which resource region selected from the plurality of resource regions is allocated to a UE.
  • the radio resource allocation information comprises at least one resource region ID.
  • the resource region ID indicates a resource region selected from the plurality of resource regions.
  • Radio resource allocation information for allocating a radio resource to the UE can be represented only with a resource region ID. This can be defined as shown in Table 5 below.
  • the radio resource allocation information can be known by informing at least one resource region ID to the UE.
  • Table 5 In the example of Table 5 above, only 8 bits are used to transmit the radio resource allocation information including the resource region ID.
  • the name and the number of bits are shown in Table 5 above for exemplary purposes only, and thus they may vary depending on the arrangement and the number of the resource regions.
  • At least one resource region having an arbitrary location and an arbitration size within one frame can be allocated to the UE.
  • FIG. 6 shows an example of radio resource allocation using the frame of FIG. 5.
  • an allocated region A3 is allocated to a UE within the frame.
  • a resource region having a resource region ID 3 is allocated to the allocated region A3.
  • the location or the number of resource regions indicated by the allocated region A3 is shown for exemplary purposes only.
  • the allocated region A3 may be represented by a resource region ID.
  • FIG. 7 shows an example of radio resource allocation using the frame of FIG. 5 according to an embodiment of the present invention.
  • an allocated region A4 is allocated to a UE within the frame.
  • resource regions having resource region IDs 3, 4, and 5 are allocated to the allocated region A4.
  • the location or the number of resource regions indicated by the allocated region A4 is shown for exemplary purposes only.
  • the allocated region A4 may be represented by a resource region ID and a duration.
  • the duration indicates the number of resource regions included in the allocated region. That is, the duration indicates the number of consecutive resource regions allocated to the UE.
  • the duration may have priority on either a frequency axis or a time axis.
  • the duration may have priority according to an order of resource region ID or not.
  • the resource region ID and the duration can be defined as shown in Table 6 below. [86] Table 6 [Table 6] [Table ]
  • the radio resource allocation information can be known by informing at least one resource region ID and the duration to the UE.
  • the number of bits for the radio resource allocation information is 12 bits in total, that is, 6 bits for the resource region ID and 6 bits for the duration.
  • the name and the number of bits are shown in Table 6 above for exemplary purposes only, and thus may vary depending on the arrangement and the number of resource regions.
  • FIG. 8 shows an example of radio resource allocation using the frame of FIG. 5 according to another embodiment of the present invention.
  • an allocated region A5 can be represented by a resource region ID and a duration D.
  • the duration D may be an exponent of 2 (i.e., 2 D ) of the number of resource regions included in the allocated region.
  • the resource region ID and the duration can be defined as shown in Table 7 below.
  • radio resource allocation information is represented as "Resource
  • the number of bits of the radio resource allocation information is 11 bits in total, that is, 8 bits for the resource region ID and 3 bit for the duration.
  • the number of bits used to transmit the radio resource allocation information is reduced in comparison with the case when the number of resource regions is directly represented by the duration.
  • the name and the number of bits are shown in Table 7 above for exemplary purposes only, and thus may vary depending on the arrangement and the number of resource regions.
  • 'duration' is described as the number of resource regions, or the number of resource regions indicated by the exponent of 2. However, this is for exemplary purposes only, and thus, any description is possible as long as it is pre-defined so that the number of resource regions can be calculated based on an arbitrary number defined in the 'duration'.
  • the allocated resource region may be represented with a multiple of 2, a multiple of 3, etc., with respect to the duration D.
  • the resource region may be allocated first on the time axis.
  • FIG. 9 shows a frame structure for explaining a method for allocating a radio resource according to an embodiment of the present invention.
  • one frame includes 9 OFDMA symbols and 12 subchannels.
  • the number of resource regions is 12.
  • Resource region IDs are 0 to 11.
  • the resource regions can be defined as shown in Table 3 above.
  • the resource region IDs can be assigned first on a frequency axis. In this case, when a resource region ID and a duration are assigned to a UE, resource regions may be allocated first on a time axis.
  • the resource regions are allocated first on the time axis, if the number of resource regions allocated according to the duration is greater than the number of resource regions allocated on the time axis, that is, allocation is not finished until the end of time domain, then the resource regions are allocated again on the time axis starting from allocatable adjacent resource regions on the frequency axis.
  • resource regions having resource region IDs 0, 4, 8, and 1 are allocated to an allocated region A6.
  • the resource regions having resource region IDs 0, 4, 8, and 1 are allocated to the allocated region A6. This is for exemplary purposes only, and thus the arrangement or the number of resource regions may vary.
  • the radio resource allocation information can include an optional indicator which indicates whether the resource regions will be allocated first on the frequency axis or the time axis.
  • the optional indicator may be represented with 1 bit.
  • the optional indicator can inform the UE of whether the resource regions have been allocated first on the time axis or the frequency axis.
  • resource region allocation on the time axis may be advantageous over resource region allocation on the frequency axis.
  • the BS and the UE may implicitly know that the resource region allocation is achieved according to the permutation in such a manner that if a permutation for diversity is used similarly to the PUSC and the FUSC, the resource region is allocated first on the frequency axis, and if a localized permutation for link adaptation is used similarly to the band- AMC, the resource regions are allocated first on the time axis
  • FIG. 10 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • an allocated region A7 is allocated to a UE within a frame.
  • the allocated region A7 includes the 7 resource regions having resource region IDs 0, 1, 2, 3, 8, 9, and 10.
  • the location or the number of the resource regions included in the allocated region A7 is shown for exemplary purposes only.
  • radio resource allocation information may have a bitmap format. If one frame includes 16 resource regions, the location and the number of the resource regions can be represented by using a 16 bits bitmap. In the bitmap, one bit matches to one resource region. The location and the number of the resource regions are indicated in such a manner that, if a corresponding resource region is allocated, T is set in the bitmap, and otherwise, '0' is set.
  • the radio resource allocation information for the allocated region A7 is expressed as (0000011100001111) 2 in the bitmap format.
  • (.) 2 denotes a binary number
  • a most significant bit (MSB) of the bitmap corresponds to a resource region having a resource region ID 15
  • a least significant bit (LSB) thereof corresponds to a resource region having a resource region ID 0.
  • MSB most significant bit
  • LSB least significant bit
  • FIG. 11 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • one frame includes 9 OFDMA symbols and 12 subchannels.
  • the number of resource regions is 12, and resource region IDs are 0 to 11.
  • the resource regions can be defined as described in Table 3 above.
  • the resource region IDs can be assigned first on a frequency axis.
  • a first allocated region A8 is allocated to the resource regions having the resource regions IDs 0 to 4, and a second allocated region A9 is allocated to the resource region having the resource region ID 5.
  • the first allocated region A8 and the second allocated region A9 may be either resource regions allocated to different UEs or resource regions through which different pieces of data are allocated to the same UE.
  • the UE can know the entire range of the first allocated region A8 allocated to the UE itself by evaluating the first resource region ID and the resource region ID of the second allocated region A9. This is only exemplary purposes only, and thus the arrangement and the number of allocated regions and the number of resource regions may be differently determined.
  • the entire allocated regions can be represented by one arbitrary resource region ID in the allocated regions.
  • FIG. 12 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • one frame includes 60 resource regions.
  • resource region IDs are 0 to 59, and the resource regions are allocated first on a time axis.
  • the resource regions have the same size herein, they may have different sizes.
  • a first allocated region AlO is allocated to regions having resource regions IDs 0 to 19
  • a second allocated region Al 1 is allocated to regions having resource region IDs 20 to 35
  • a third allocated region A12 is allocated to regions having resource IDs 36 to 59.
  • the first allocated region AlO, the second allocated region Al l, and the third allocated region A 12 may be regions allocated to different UEs or regions through which different pieces of data is allocated to the same UE.
  • radio resource allocation information can represent the allocated region by indicating a resource region positioned at the edge of the rectangle.
  • the resource region positioned at the edge of the rectangle can be the first or the last resource of the allocated region.
  • Table 8 shows a case where an allocated region is represented only with a last resource ID of the allocated region. [111] Table 8 [Table 8] [Table ]
  • FIG. 13 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • one frame includes 60 resource regions.
  • resource region IDs are 0 to 59, and the resource regions are allocated first on a frequency axis.
  • the resource regions have the same size herein, they may have different sizes.
  • a first allocated region A13 is allocated to regions having subchannel indices 0 to 4
  • a second allocated region A 14 is allocated to regions having subchannel indices 5 to 8
  • a third allocated region A15 is allocated to regions having subchannel indices 9 to 14.
  • the first allocated region A 13, the second allocated region A 14, and the third allocated region A15 may be regions allocated to different UEs or regions through which different pieces of data is allocated to the same UE.
  • Radio resource allocation information for each allocated region can be represented by a first resource region ID and a last resource region ID of each allocated region. In this case, each allocated region is a rectangular region.
  • Table 9 shows a case where an allocated region is represented by a first resource region ID and a last resource region ID of the allocated region. [118] Table 9 [Table 9] [Table ]
  • the UE can know a range of the allocated region assigned to the UE itself even if only the first resource region ID and the last resource region ID are known.
  • the radio resource allocation information for the rectangular allocated region can be represented by a first slot ID and a last slot ID of each allocated region.
  • Table 10 shows a case where an allocated region is represented by a first slot ID and a last slot ID of the allocated region. [122] Table 10 [Table 10] [Table ]
  • FIG. 14 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • a frame can be divided into different permutation zones according to a permutation applied in one frame. That is, zones applied with different permutations can be determined within one frame.
  • One permutation zone can include at least one resource region.
  • the frame of FIG. 14 includes 8 OFDMA symbols and 12 subchannels, and a new permutation zone Zl includes 8 resource regions.
  • the resource regions included in the permutation zone Zl have resource region IDs 0 to 7.
  • a resource region Z1_A1 having a resource region ID 7 is assigned to one UE in the permutation zone Zl.
  • the remaining zones other than the permutation zone Zl may be applied with another permutation different from that used in the permutation zone Zl.
  • the location and size of the permutation zone Zl, and the location and size of each resource region included therein can be represented with permutation zone information.
  • the permutation zone information defines a start location of the new permutation zone and also defines the location and size of each resource region included in the permutation zone.
  • the permutation zone information is associated with the size of the resource region on time domain and frequency domain.
  • the permutation zone information is a control signal and can be transmitted to the UE through a dedicated control channel or a shared control channel.
  • the permutation zone information may define a permutation zone within a DL resource or a UL resource.
  • Table 11 below shows an example of the permutation zone information that defines the start location of the new permutation zone.
  • An OFDMA symbol offset is used to specify the start location of the new permutation zone and defines a permutation applied to the permutation zone. This is for exemplary purposes only, and thus the name and the number of bits may vary depending on systems, and the applied permutation may arbitrarily change according to UL, DL, or systems.
  • Table 12 below shows an example of the permutation zone information that defines the resource regions included in the permutation zone.
  • 'OFDMA symbol offset', 'Subchannel offset', 'No. OFDMA symbols', and 'No. subchannels' can be used to define a range of the permutation zone Zl and the location and size of each resource region.
  • the 'OFDMA symbol offset' indicates an offset from an OFDMA symbol at which a new permutation starts.
  • the 'subchannel offset' is an index indicating an offset from a subchannel at which the permutation zone Zl starts.
  • the 'No. OFDMA symbols' indicates the number of OFDMA symbols assigned to one resource region.
  • the 'No. channels' indicates the number of subchannels assigned to one resource region.
  • Resource regions are allocated first on a frequency axis within the range of the permutation zone Zl.
  • resource regions having resource region IDs 0 to 5 are allocated on the frequency axis and resource regions having resource region IDs 6 and 7 are assigned to next OFDMA symbols.
  • the present invention is not limited thereto, and thus the resource regions may be allocated first on a time axis within the range of the permutation zone Zl.
  • Table 13 below shows another example of the permutation zone information that defines the resource regions included in the permutation zone. [137] Table 13 [Table 13] [Table ]
  • a range of the permutation zone Zl and a size of each resource region included in the range can be defined with 'Slot in time offset', 'subchannel offset', 'No. slot in time', and 'No. subchannels'.
  • the 'slot in time offset' indicates an offset of a slot located in a time axis from a time point at which a new permutation starts.
  • the 'No. slot in time' indicates how many slots are assigned to one resource region in the time domain.
  • the 'No. subchannels' indicates the number of subchannels assigned to one resource region.
  • the 'subchannel offset' is an index indicating an offset from a subchannel at which the permutation zone Zl starts.
  • 'No. slot in frequency' may be used to indicate how many slots are included along a frequency axis.
  • Table 14 below shows another example of the permutation zone information that defines the resource regions included in the permutation zone. Herein, all resource regions included in the permutation zone have the same size.
  • a range of the permutation zone Zl and a size of each resource region included therein can be defined with 'No. OFDMA symbols' and 'No. subchannels'.
  • 'Num_region' indicates the number of resource regions included in the permutation zone Zl.
  • Table 15 below shows another example of the permutation zone information that defines the resource regions included in the permutation zone. Herein, all resource regions included in the permutation zone have the same size.
  • the permutation zone information can be transmitted with a less number of bits in comparison with a case where both the location and the size of each resource region have to be infromed.
  • the number of resource regions can be automatically calculated according to a size of one frame (or permutation zone) without informing the number of resource regions.
  • each permutation zone can be defined with the number of slots.
  • Table 16 below shows definition of each permutation zone according to a slot.
  • each permutation zone can be represented by the 'Number of slots in time' and the 'Number of slots in frequency'.
  • Each permutation zone may also be defined in uplink with the 'Number of slots in time' and the 'Number of slots in frequency' in the same manner.
  • the number of bits for 'Region ID' may be automatically calculated according to the size of one frame (or permutation zone) without informing of the number of bits.
  • FIG. 15 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • a frame includes 8 OFDMA symbols and 12 subchannels.
  • a new permutation zone Z2 includes 8 resource regions, and resource region IDs are 0 to 7.
  • the resource regions included in the permutation zone Z2 are allocated first on a time axis.
  • Resource regions having resource region IDs 0 and 1 are allocated first on the time axis within a range of the permutation zone Z2.
  • resource regions having resource region IDs 2 and 3 are allocated on the time axis in a next frequency region. In this manner, allocation is carried out for the remaining resource regions having resource region IDs 4 to 7.
  • FIG. 15 is different from FIG. 14 in terms of a direction in which the resource regions included in the permutation zone Z2 are allocated.
  • the permutation zone Z2 can be represented with the permutation zone information defined in Table 12 to Table 16 above.
  • Whether the resource regions will be allocated first on the time axis or the frequency axis within the permutation zone Z2 can be predetermined.
  • a preferable allocation direction of the resource regions may be reported by a BS to a UE by representing the allocation direction with one index. This index can be represented with one bit.
  • FIG. 16 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • a frame includes 10 OFDMA symbols and 12 subchannels.
  • a new permutation zone Z3 includes 8 resource regions, and resource region IDs are 0 to 7.
  • the permutation zone information can be represented by using any one of Table 12 to 16 above.
  • the frame size is also shown exemplary purposes only, and thus the last remaining portions of the frame can be excluded in the allocation of the permutation zone Z3 if the last remaining portions of the frame are smaller in size than one resource region of the permutation zone Z3 because other types of permutations are used or because other resource regions are allocated with priority. Even in a case where the resource regions are allocated first on a frequency axis, the last remaining portions can be excluded in the allocation of the permutation zone Z3 if the remaining portions are smaller in size than the resource region to be allocated.
  • FIG. 17 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • a frame includes 10 OFDMA symbols and 12 subframes.
  • a new permutation zone Z4 includes 8 resource regions, and resource region IDs are 0 to 7.
  • the permutation zone information can be represented by using any one of Table 12 to Table 16 above.
  • the number of resource regions included in the permutation zone Z4 there is no limit in the number of resource regions included in the permutation zone Z4, and the location and size of the permutation zone Z4 can change variously.
  • the frame size is also shown exemplary purposes only.
  • the permutation zone Z4 can include resource regions having different sizes because other types of permutations are used or because other resource regions are allocated with priority. Even in a case where the resource regions included in the permutation zone are allocated first on a frequency axis, the permutation zone Z4 can include resource regions having smaller sizes due to remaining portions.
  • FIG. 18 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • a frame can be divided into a plurality of resource regions having different definitions.
  • the divided resource regions may be changed in size according to permutation zones or resource regions which will be defined later.
  • the first divided resource regions having resource region IDs 1, 3, 5, and 7 change in size due to the new permutation zone.
  • the resource regions of the resource region IDs 1, 3, 5, and 7 may be allocated to a UE without altering the changed size or may not be allocated thereto. If a size of user data to be transmitted to the UE can be carried on a resource region having the changed size, the data can be used without alteration. Alternatively, other suitable data may be carried and transmitted on a resource region having the changed size.
  • FIG. 19 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • a frame includes 10 OFDMA symbols, 12 subchannels, and resource regions having resource region IDs 0 to 2. This is for exemplary purposes only, and thus the size of the frame as well as the size and number of resource regions included in the frame can change variously.
  • the resource regions included in the frame can be represented with the number of resource regions, a subchannel offset, and the number of subchannels. Table 17 below shows an example of defining resource regions.
  • the resource regions are allocated starting from a first region of a first allocatable region in the frame, the resource regions can be represented with the number of resource regions and the number of subchannels included in each resource region within the frame. Table 18 below shows another example of defining resource regions.
  • a time- axis offset, the number of OFDMA symbols, or the like can use values provided by other control information or can include all regions that can be allocated along the time axis.
  • FIG. 20 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • a frame includes 10 OFDMA symbols, 12 subchannels, and 3 resource regions having resource region IDs 0 to 2. This is for exemplary purposes only, and thus the size of the frame as well as the size and number of resource regions included in the frame can change variously.
  • the resource regions are allocated starting from a first region of a first allocatable region in the frame and the resource regions have the same size, the resource regions can be represented with the number of resource regions and the number of subchannels included in each resource region. Table 19 below shows another example of defining resource regions. [180] Table 19 [Table 19] [Table ]
  • the resource regions having resource region IDs 0 to 2 can be defined as
  • a time-axis offset, the number of OFDMA symbols, or the like can use values provided by other control information or can include all regions that can be allocated along the time axis.
  • FIG. 21 shows a frame structure for explaining a method for allocating a radio resource according to another embodiment of the present invention.
  • a frame includes 10 OFDMA symbols, 12 subchannels, and 6 resource regions having resource region IDs 0 to 5. This is for exemplary purposes only, and thus the size of the frame as well as the size and number of resource regions included in the frame can change variously.
  • the resource regions included in the region can be represented only with the number of subchannels. Table 20 below shows another example of defining resource regions.
  • a time-axis offset, the number of OFDMA symbols, or the like can use values provided by other control information or can include all regions that can be allocated along a time axis.
  • a BS can define a resource region of a frame and transmit information (i.e., a resource region ID, a duration, a bitmap, etc.) to a UE as radio resource allocation information.
  • information i.e., a resource region ID, a duration, a bitmap, etc.
  • the UE can know the resource region allocated to the UE and thus can transmit and receive a data stream.
  • the resource region may be defined differently in a plurality of frames. Whenever the definition on the resource region is modified, the BS has to inform the UE of the modified definition.
  • Every function as described above can be performed by a processor such as a microprocessor based on software coded to perform such function, a program code, etc., a controller, a micro-controller, an ASIC (Application Specific Integrated Circuit), or the like. Planning, developing and implementing such codes may be obvious for the skilled person in the art based on the description of the present invention.
  • an OFDMA symbol offset, a subchannel offset, a slot time offset, etc. may be determined according to a specific time point other than a start point of a preamble (or a permutation zone) and also may be newly determined whenever a resource region of each frame is allocated. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.

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Abstract

La présente invention concerne un procédé d'allocation de ressource radio dans un système de communication sans fil comprenant la définition d'une pluralité de zones de ressources dans une trame, une zone de ressources comportant au moins un symbole d'accès multiple par répartition orthogonale de la fréquence (OFDMA) et au moins une voie intermédiaire, la configuration d'information d'allocation de ressources radio indiquant quelle zone de ressources sélectionnée parmi la pluralité de zones de ressources est allouée à l'équipement d'utilisateur, l'information d'allocation de ressources radio comportant au moins un identifiant de zone de ressources (ID), un identifiant d'une zone de ressources sélectionnée parmi la pluralité de zones de ressources indiquant une, et la transmission de l'information d'allocation de ressources radio à l'équipement d'utilisateur.
PCT/KR2008/004045 2007-07-13 2008-07-09 Procédé d'allocation de ressource radio dans un système de communication sans fil et procédé de transmission ou de réception de données utilisant un tel procédé WO2009011513A2 (fr)

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US97873607P 2007-10-09 2007-10-09
US60/978,736 2007-10-09
KR1020070111979A KR101438220B1 (ko) 2007-07-13 2007-11-05 무선통신 시스템의 무선자원 할당 방법 및 이를 이용한데이터 송신 또는 수신 방법
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WO2010114286A2 (fr) * 2009-03-30 2010-10-07 Lg Electronics Inc. Procédé d'appariement de terminaux à l'aide de données factices
WO2010114286A3 (fr) * 2009-03-30 2010-12-09 Lg Electronics Inc. Procédé d'appariement de terminaux à l'aide de données factices
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WO2011106927A1 (fr) * 2010-03-02 2011-09-09 富士通株式会社 Station de base dans un système de communication sans fil ofdma et procédé d'attribution de ressources associé
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