WO2012150762A2 - Appareil et procédé pour transmettre des informations d'attribution de ressources - Google Patents

Appareil et procédé pour transmettre des informations d'attribution de ressources Download PDF

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Publication number
WO2012150762A2
WO2012150762A2 PCT/KR2012/001664 KR2012001664W WO2012150762A2 WO 2012150762 A2 WO2012150762 A2 WO 2012150762A2 KR 2012001664 W KR2012001664 W KR 2012001664W WO 2012150762 A2 WO2012150762 A2 WO 2012150762A2
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component carrier
size
resource
block group
resource block
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PCT/KR2012/001664
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English (en)
Korean (ko)
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WO2012150762A3 (fr
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홍성권
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주식회사 팬택
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Priority claimed from KR1020110076229A external-priority patent/KR20120124013A/ko
Application filed by 주식회사 팬택 filed Critical 주식회사 팬택
Priority to US14/113,262 priority Critical patent/US20140044085A1/en
Publication of WO2012150762A2 publication Critical patent/WO2012150762A2/fr
Publication of WO2012150762A3 publication Critical patent/WO2012150762A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to wireless communication, and more particularly, to an apparatus and method for transmitting resource allocation information in a wireless communication system.
  • UE In general, in 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), UE specific as well as control information for uplink and downlink communication through a physical downlink control channel transmitted through downlink Transmits resource allocation information for allocating resources
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • a radio resource is represented by a block divided in a time-frequency plane, that is, a resource block, which may be referred to as a set of subcarriers for a specific time.
  • the eNodeB schedules radio resources.
  • the base station increases the use efficiency of radio resources through dynamic scheduling that dynamically allocates radio resources according to the amount of data to be transmitted and received, or depending on the existence of data to be transmitted and received.
  • An object of the present invention is to provide a method for efficiently performing resource allocation for a multi-cell or multi-component carrier.
  • An object of the present invention is to provide a method for variably configuring a resource allocation unit in a PDCCH.
  • An object of the present invention is to provide a method for allocating resources on a smaller number of PDCCHs for a plurality of CCs.
  • An object of the present invention is to provide a method for allocating resources on a number of PDCCHs less than the number of cells for a plurality of associated cells.
  • An object of the present invention is to allocate a PDSCH region in one or more CCs or cells or transmission points using one PDCCH.
  • the present invention relates to a resource allocation method, and an embodiment of the present invention includes configuring a cell set and transmitting resource allocation information specific to a terminal through a single control channel, wherein the resource allocation information includes a cell set. And information on concatenating resource blocks allocated to constituting cells and allocating them to the terminal.
  • the cell set may be configured with a component carrier selected from component carriers configured in the multi-component carrier system, and resource allocation information is concatenated to the terminal by concatenating resource blocks allocated to the component carriers constituting the cell set. It may include information about doing.
  • the cell set may be composed of selected cells among linked cells in an associated multi-point (CoMP) system, and the associated cells may include neighboring cells of the main serving cell and the main serving cell, micro cells in and around the main serving cell, and the main cell. It may include at least one of a remote radio head inside and outside the serving cell and a relay inside and outside the main serving cell.
  • CoMP multi-point
  • the resource allocation information may include information about the size of the resource block group consisting of the linked resource blocks, and may be transmitted to the code point.
  • the code point transmitted is associated with a corresponding cell set and resource block group on an information set that includes information about a configurable cell set and / or information about a resource block group that can be allocated in combination for the cell set. Information can be indicated.
  • the information about the resource block group may be information about the size of the resource block group.
  • the present invention also relates to a method for acquiring a resource, and an embodiment of the present invention relates to a resource block connecting resource blocks allocated to a cell set indicated by the resource allocation information and receiving resource allocation information on a single control channel. Obtaining, as a group, a resource having a size indicated by the resource allocation information.
  • the cell set may be configured with a component carrier selected from the component carriers configured in the multi-component carrier system, and in the resource acquisition step, the component carrier indicated according to a carrier indicator field among the component carriers constituting the cell set It is possible to obtain a resource block group starting from uplink and downlink component carriers corresponding to and having a size indicated by resource allocation information.
  • resource allocation regions of uplink and downlink cells corresponding to each cell are concatenated in the index order of each cell constituting the cell set to obtain a resource block group having a size indicated by the resource allocation information. It may be. In this case, there may be a case where there is no carrier indication field in the physical downlink control channel (PDCCH) and there is no intercarrier scheduling.
  • PDCCH physical downlink control channel
  • Another embodiment of the method for acquiring a resource according to the present invention includes: receiving resource allocation information on a single control channel and all resource blocks or all resource block groups connecting resource blocks allocated to a cell set indicated by the resource allocation information.
  • the method may include obtaining a resource having a calculated size based on the configuration of the cell set.
  • the resource may be acquired such that the size of the connected resource block group is a size obtained by dividing the entire resource block for the cell set by the resource block group of the reference cell.
  • the reference cell may be determined as a cell having a maximum band among cells constituting a cell set, a cell having a predetermined specific band, or a cell to which a control channel is transmitted.
  • the cell set is composed of a component carrier selected from component carriers configured in a multi-component carrier system, and in the resource acquisition step, an element indicated according to a carrier indicator field among component carriers constituting the cell set A resource block group starting from a resource allocation region of an uplink component carrier corresponding to a carrier and having a calculated size may be obtained.
  • a resource block group having a calculated size can be obtained by concatenating resource allocation regions of uplink cells corresponding to each cell in the index order of each cell constituting the cell set.
  • PDCH physical downlink control channel
  • Another embodiment of the present invention is a method for transmitting a control channel in a method for transmitting a control channel by a base station in a wireless communication system, the method comprising: mapping downlink control information including a carrier indicator field to a physical downlink control channel And transmitting the physical downlink control channel to the terminal and transmitting a plurality of physical downlink shared channels mapped one-to-many with the physical downlink control channel to the terminal. Indicating a combination of component carriers of the, the plurality of physical downlink shared channels may be allocated to each of the plurality of component carriers and transmitted to the terminal.
  • Another embodiment of the present invention is a method for transmitting resource allocation information performed by a base station, the method comprising: configuring at least one component carrier for a terminal, and being concatenated over the at least one component carrier; And transmitting resource allocation information indicating resource blocks allocated to a data channel through a single control channel, wherein the resource allocation information is a resource defining a basic unit to which the concatenated resource blocks are allocated. It may include information about the size of the block group.
  • the component carrier set is composed of selected cells among linked cells in a coordinated multiple point (CoMP) system, and the associated cells include a primary serving cell and a neighboring cell of the primary serving cell, At least one of a micro cell inside and outside the main serving cell, a remote radio head (RRH) inside and outside the main serving cell, and a relay inside and outside the main serving cell may be included.
  • CoMP coordinated multiple point
  • the resource allocation information is represented by a code point, and the code point may indicate a size of a resource block group applied to a group consisting of the at least one component carrier.
  • the size of the resource block group may be determined as the size of the resource block group defined in the band of the basic component carrier of the at least one component carrier.
  • Another embodiment of the present invention is a method of receiving resource allocation information performed by a terminal, the method comprising: configuring at least one component carrier and a concatenated data channel across the at least one component carrier; And receiving resource allocation information indicating resource blocks allocated through a single control channel, wherein the resource allocation information includes a resource block group defining a basic unit to which the concatenated resource blocks are allocated. It may include information about size.
  • the component carrier set is composed of selected cells among linked cells in a coordinated multiple point (CoMP) system, and the associated cells include a primary serving cell and a neighboring cell of the primary serving cell, At least one of a micro cell inside and outside the main serving cell, a remote radio head (RRH) inside and outside the main serving cell, and a relay inside and outside the main serving cell may be included.
  • CoMP coordinated multiple point
  • the resource allocation information is represented by a code point, and the code point may indicate a size of a resource block group applied to a group consisting of the at least one component carrier.
  • the size of the resource block group may be determined as the size of the resource block group defined in the band of the basic component carrier of the at least one component carrier.
  • Another embodiment of the present invention is a base station for transmitting resource allocation information, comprising: a processor constituting at least one component carrier for a terminal, and a concatenated data channel across the at least one component carrier; And a radio frequency (RF) unit for transmitting resource allocation information indicating resource blocks to be transmitted through a single control channel, wherein the resource allocation information is a resource defining a basic unit to which the concatenated resource blocks are allocated. It may include information about the size of the block group.
  • RF radio frequency
  • the component carrier set is composed of selected cells among linked cells in a coordinated multiple point (CoMP) system, and the associated cells include a primary serving cell and a neighboring cell of the primary serving cell, At least one of a micro cell inside and outside the main serving cell, a remote radio head (RRH) inside and outside the main serving cell, and a relay inside and outside the main serving cell may be included.
  • CoMP coordinated multiple point
  • the resource allocation information is represented by a code point, and the code point may indicate a size of a resource block group applied to a group consisting of the at least one component carrier.
  • the size of the resource block group may be determined as the size of the resource block group defined in the band of the basic component carrier of the at least one component carrier.
  • Another embodiment of the present invention is a terminal for receiving resource allocation information, comprising: a processor constituting at least one component carrier, and a resource block allocated to a data channel being concatenated over the at least one component carrier; And an RF unit for receiving resource allocation information indicating resource blocks through a single control channel, wherein the resource allocation information includes a size of a resource block group defining a basic unit to which the concatenated resource blocks are allocated. It may contain information about.
  • the component carrier set is composed of selected cells among linked cells in a coordinated multiple point (CoMP) system, and the associated cells include a primary serving cell and a neighboring cell of the primary serving cell, At least one of a micro cell inside and outside the main serving cell, a remote radio head (RRH) inside and outside the main serving cell, and a relay inside and outside the main serving cell may be included.
  • CoMP coordinated multiple point
  • the size of the resource block group may be determined as the size of the resource block group defined in the band of the basic component carrier of the at least one component carrier.
  • the present invention it is possible to efficiently perform resource allocation for a multi-cell or multi-component carrier by variably configuring a resource allocation unit in the PDCCH.
  • resources can be allocated to a plurality of CCs on a smaller number of PDCCHs.
  • resources may be allocated on a number of PDCCHs less than the number of cells for a plurality of associated cells.
  • FIG. 1 shows a structure of a downlink subframe to which the present invention is applied.
  • FIG. 2 is an exemplary diagram showing a resource grid for one downlink slot to which the present invention is applied.
  • FIG. 3 is a diagram schematically illustrating a resource allocation method of type 0 among resource allocation methods to which the present invention is applied.
  • FIG. 4 is a diagram schematically illustrating a resource allocation method of type 2 among resource allocation methods to which the present invention is applied.
  • FIG. 5 is a diagram schematically illustrating an example of intercarrier scheduling in carrier aggregation.
  • FIG. 6 is a diagram schematically illustrating an example in the case where there is no intercarrier scheduling in carrier aggregation.
  • FIG. 7 is a diagram schematically illustrating a variable method of scheduling a resource block group size in a system to which the present invention is applied.
  • FIG. 8 is a diagram schematically illustrating an example of a CoMP system to which the present invention is applied.
  • FIG. 9 is a flowchart schematically illustrating an operation performed by a base station in a system to which the present invention is applied.
  • FIG. 10 is a flowchart schematically illustrating an operation performed by a terminal in a system to which the present invention is applied.
  • FIG. 11 is a block diagram schematically illustrating a configuration of a terminal and a base station in a system to which the present invention is applied.
  • the present specification describes a wireless communication network
  • the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the terminal coupled to the network.
  • 'transmitting a channel' may be interpreted as meaning transmitting information through a specific channel.
  • the channel is a concept including both a control channel and a data channel
  • the control channel may be, for example, a physical downlink control channel (PDCCH) or a physical uplink control channel (PUCCH).
  • the data channel may be, for example, a Physical Downlink Shared CHannel (PDSCH) or a Physical Uplink Shared CHannel (PUSCH).
  • FIG. 1 shows a structure of a downlink subframe to which the present invention is applied.
  • a subframe includes two slots.
  • the preceding two to three OFDM symbols are control regions to which the PDCCH is allocated, and the remaining OFDM symbols are data regions to which the PDSCH is allocated.
  • the downlink physical control channel includes a physical control format indicator channel (PCFICH) and a physical hybrid-ARQ indicator channel (PHICH).
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid-ARQ indicator channel
  • 3GPP LTE transmits control information for up-down communication and resource allocation information for resources allocated to each terminal in a frequency and time domain.
  • the PDCCH delivers resource allocation of Paging CHannel (PCH) and PDSCH and hybrid automatic repeat reQuest (HARQ) information related to PDSCH.
  • the PDCCH may carry an uplink grant informing a user of resource allocation of uplink transmission and a downlink grant informing of resource allocation of downlink transmission.
  • the physical channel for transmitting the format indicator indicating the format of the PDCCH that is, the number of OFDM symbols constituting the PDCCH to the UE is PCFICH.
  • PCFICH is included in every subframe.
  • the format indicator may be called a control format indicator (CFI).
  • the PHICH carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for uplink HARQ.
  • a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or several consecutive CCEs.
  • CCE is a physical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of possible bits of the PDCCH are determined by the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • DCI downlink control information
  • Table 1 is a table showing the DCI format.
  • Table 1 DCI format Explanation 0 Used for scheduling of PUSCH (Uplink Grant) One Used for scheduling one PDSCH codeword in one cell 1A Used for simple scheduling of one PDSCH codeword in one cell and random access procedure initiated by PDCCH command 1B Used for simple scheduling of one PDSCH codeword in one cell using precoding information 1C Used for brief scheduling of one PDSCH codeword and notification of MCCH change 1D Used for simple scheduling of one PDSCH codeword in one cell containing precoding and power offset information 2 Used for PDSCH scheduling for UE configured in spatial multiplexing mode 2A Used for PDSCH scheduling of UE configured in long delay CDD mode 2C Used in transmission mode 9 (multi-layer transmission) 3 Used to transmit TPC commands for PUCCH and PUSCH with power adjustment of 2 bits 3A Used to transmit TPC commands for PUCCH and PUSCH with single bit power adjustment 4 Used for scheduling for PUSCH in one uplink cell using a multi-antenna port transmission mode
  • DCI format 0 indicates uplink resource allocation information
  • DCI formats 1 to 2 indicate downlink resource allocation information
  • DCI formats 3 and 3A indicate uplink transmit power control (TPC) for arbitrary UE groups.
  • TPC transmit power control
  • Each field of the DCI is sequentially mapped to an information bit. For example, if the DCI is mapped to information bits having a total length of 44 bits, the resource allocation field may be mapped to 10th to 23rd bits of the information bits.
  • DCI includes uplink resource allocation information and downlink resource allocation information.
  • the uplink resource allocation information may be referred to as an uplink grant, and the downlink resource allocation information may be referred to as a downlink grant.
  • Table 2 shows DCI of format 0 which is uplink resource allocation information (or uplink grant).
  • the flag (Flag for format 0 / format 1A differentiation) is an indicator for distinguishing DCI 0 from DCI 1A as 1-bit information.
  • the hopping flag is 1-bit information and indicates whether frequency hopping is applied or not when the terminal performs uplink transmission. For example, a hopping flag of 1 indicates that frequency hopping is applied during uplink transmission and 0 when no hopping flag is applied during uplink transmission.
  • Resource block (RB) allocation and hopping resource allocation may also be referred to as a resource allocation field.
  • the resource allocation field indicates the physical location or amount of resources allocated to the terminal.
  • the uplink grant may include a surplus bit or a padding bit to keep the total number of bits constant so as to have the same size as the downlink grant. That is, DCI has a variety of formats, even if the control information of the different formats using the redundant bits can be adjusted to the same length of the bit, thereby allowing the UE to perform blind decoding smoothly.
  • the uplink grant (DCI format 0) is 27 bits (excluding the CIF field and the CRC field). If the length of the bit determined as the input of the blind decoding is 28 bits, the base station adds a surplus bit of 1 bit to the uplink grant during scheduling so that the total number of bits of the uplink grant is 28 bits. Through this process, the length is made equal to DCI format 1A, in order to be processed in one decoding process with the same size as DCI format 1A in the blind decoding process. At this time, since the excess bits do not contain special information, all of them may be set to zero. Of course, the number of surplus bits may be less than two, or may be large.
  • FIG. 2 is an exemplary diagram showing a resource grid for one downlink slot to which the present invention is applied.
  • the number N DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell.
  • the resource region is composed of time frequency units of a resource block.
  • the resource region is composed of time frequency units of a resource block.
  • the amount of bits required for indicating resource allocation information may increase. Therefore, several resource blocks may be combined and processed as a resource block group (RBG).
  • RBG resource block group
  • Resource allocation information represented by a resource block or a resource block group may be transmitted in a resource allocation field in the PDDCH as described above.
  • the resource allocation information may be transmitted in the form of Resource Indication Value (RIV).
  • RIV Resource Indication Value
  • the bandwidths considered in LTE are 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, and the number of resource blocks corresponding to each band, the size of the resource block group (the number of resource blocks constituting one resource block group), The number of resource block groups is shown in Table 3.
  • the total number of available resource blocks varies according to a given bandwidth.
  • the different number of total resource blocks means that the size of information indicating resource allocation is different.
  • the number of cases in which resource blocks are allocated may vary depending on the resource allocation method.
  • a resource block group may be allocated using a bitmap format (type 0).
  • the resource block group may be allocated based on a predetermined interval or period on the frequency axis (type 1).
  • a resource block may be allocated as a region defined by contiguous resource blocks on a frequency axis (type 2).
  • a resource block or a resource block group allocated to the UE is indicated by the resource allocation field, and the bit request amount of the resource allocation field varies according to each type of resource allocation scheme and the total number of resource blocks for each bandwidth.
  • three types (type 0, type 1, and type 2) can be used as follows.
  • 3 is a diagram illustrating a resource allocation method of type 0 as an example of a resource allocation method.
  • resources are allocated on a type 0 resource block basis.
  • each resource block group may be represented by a bitmap, where each bit is mapped to each resource block group. For example, if the bit is 1, the corresponding resource block group may be allocated to the terminal. If the bit is 0, the corresponding resource block group may not be allocated to the terminal. Therefore, the bitmap representing the case of FIG. 3 is 010011100110100.
  • the required amount of bits is as many as the number of resource block groups. That is, the required number of bits B can be obtained as shown in Equation 1 when the number of resource block groups is n and the size of the resource block group (the number of resource blocks per resource block group) is P.
  • I an integer greater than x that is closest to x.
  • FIG. 4 is a diagram schematically illustrating a type 2 resource allocation scheme as another example of a resource allocation scheme to which the present invention is applied.
  • At least one adjacent resource block may be bundled and allocated.
  • the resource allocation information according to type 2 may be expressed as an offset from the start point of all resource blocks and the number of adjacent resource blocks on the resource allocation field.
  • the offset is 2
  • the number of resource blocks is 10.
  • Type 2 represents Contiguous Resource Allocation
  • Type 0 and Type 1 represent Non-contiguous Resource Allocation. Accordingly, while resource allocations of type 0 and type 1 resources are often represented as resource block groups, type 2 resource allocation methods express resource allocation in the form of resource blocks to provide more granular scheduling units. Can have
  • the number of bits of the resource allocation field required for representing the resource allocation of type 2 is smaller than that of type 0 or type 1.
  • the number of bits B of a required resource allocation field may be determined by Equation 2.
  • DCI format 0 may be used as the division bits.
  • the surplus bits are due to DCI format 0 having the same PDCCH size as DCI format 1A.
  • DCI format 0 and DCI format 1A are designed to have the same size, and DCI format 1A requires more than one bit more than DCI format 0, considering the use of the internal fields of DCI format 0 and DCI format 1A, respectively. In format 0, there is always more than one bit of surplus bits.
  • DCI format 0 and DCI format 1A are treated as the same decoding process, and are blindly decoded assuming a certain size for each band. After the predetermined size is confirmed, a DCI format 0 or DCI format 1A is distinguished through a division bit inside the PDCCH (a division bit for distinguishing DCI format 1 and DCI format 1A).
  • a cluster means a group of contiguous resource blocks or resource block groups.
  • uplink resource allocation type 0 is a single cluster scheme in the same manner as downlink type 2, and uplink resource allocation type 1 is specified (for example, two) using enumerated source encoding described below.
  • the limit is to have a number of clusters.
  • Enumerative source coding may be used to encode and decode RIV for discontinuous resource allocation using a limited number of clusters.
  • ego Means x C y .
  • resource blocks have an indexing form of 1 to N (N UL RB is the number of uplink resource blocks)
  • N UL RB is the number of uplink resource blocks
  • the starting value of each cluster uses the index value of the resource block as it is, and the ending value of each cluster is the resource block.
  • the code is specified in the form of an index value of +1 and encoded in an enumerated source form.
  • the terminal may perform enumeration source decoding with the algorithm shown in Table 4.
  • LTE-A supports carrier aggregation.
  • Carrier aggregation combines a plurality of bands for downlink and uplink for FDD to form a carrier, and for TDD, a conventional single band or carrier allocated to the entire uplink and downlink is extended.
  • Carrier aggregation can increase communication quality and channel capacity.
  • An important design criterion for carrier aggregation is that it makes full use of the specifications for a single carrier supported by the existing LTE standard.
  • the existing LTE standard the standard is defined for a carrier having various bandwidths, and the principle of individual carrier design in carrier aggregation follows the existing LTE standard as much as possible.
  • the maximum carrier that can be allocated to a specific terminal is different for each terminal.
  • a carrier set that can be allocated to the UE as much as possible may be defined as a configuration component carrier set.
  • the existing standard consisting of a single component carrier is extended to a plurality of component carriers, which enables cross carrier scheduling to enable scheduling of one component carrier to another component carrier.
  • the CC may be divided into a Primary Component Carrier (PCC) and a Secondary Component Carrier (SCC) according to activation.
  • the major carriers are always active carriers, and the subcarrier carriers are carriers that are activated / deactivated according to specific conditions.
  • Activation refers to the transmission or reception of traffic data being made or in a ready state. Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
  • Activation / deactivation is a method in which an uplink component carrier connected (SIB-2-linked) of a downlink active / inactive state based on a downlink component carrier is followed. Scheduling is not performed on the inactive downlink component carrier, and CSI is not measured by the terminal.
  • SIB-2-linked uplink component carrier connected
  • PDSCH allocation is performed for the activated downlink component carriers, and CSI measurement is also performed by the terminal and reported to the base station.
  • the activation / deactivation scheme is applied to reduce the complexity of the terminal and reduce the power requirement.
  • the activation / deactivation is determined by the base station.
  • the terminal is controlled by MAC signaling of the base station, and there may be ambiguity between the base station and the terminal due to an error in MAC signaling or during a signaling delay or configuration time.
  • the terminal may use only one major carrier, or may use one or more subcomponent carriers together with the major carrier.
  • the terminal may be assigned a major carrier and / or sub-carrier carrier from the base station.
  • the PDCCH may transmit allocation information for resources of other component carriers as well as resource allocation in the component carrier to which the PDCCH belongs. This is called cross-carrier scheduling. By scheduling between carriers, control information about a subcarrier can be transmitted to a major carrier so that scheduling is flexible. Inter-carrier scheduling may be implemented by a carrier indicator field (CIF). CIF is included in the payload of the PDCCH. The CIF is an individual field indicating at least one component carrier allocated to a specific terminal. In the inter-carrier scheduling, the UE may check, via the CIF, which component carrier the received control information on the PDCCH is for. Currently, in LTE-A, a 3-bit field is allocated to CIF and can indicate up to five CCs. That is, only five values among the possible values of 0 to 7 are used to indicate the component carrier, and the remaining three values are reserved without using them.
  • CIF carrier indicator field
  • FIG. 5 is a diagram schematically illustrating an example of intercarrier scheduling in carrier aggregation.
  • the downlink major carrier 610 is a single carrier, it is possible to allocate both a downlink grant and an uplink grant for a subcarrier by intercarrier scheduling.
  • the PDCCH of the downlink major carrier 610 schedules transmission of the PDSCH of the downlink subcomponent carriers 620 and 630 and the PUSCH of the uplink component carriers 640 and 650.
  • the uplink major carrier 640 is also one component carrier, but if the resource for PUCCH is properly allocated (explicit or implicit allocation), the PUCCH for the downlink component carrier is one component carrier. It can be assigned to uplink major carriers.
  • explicit resource allocation refers to a case of explicitly informing the UE of resource allocation through higher layer signaling
  • implicit resource allocation refers to resource allocation through an appropriate rule including a position in a control region of the PDCCH. This means that the terminal is informed.
  • the physical uplink control channel (PUCCH) is a channel for transmitting control information for uplink, and means a channel for transmitting uplink control information (UCI) such as ACK / NAK, CQI / PMI / RI, and the like.
  • UCI uplink control information
  • aperiodic channel state information (CSI) reporting payload may be determined according to a report mode for the 'configured component carrier' and the number of configured component carriers.
  • the aperiodic CSI request field contains 2 bits (1 bit is added to the DCI format in the UE specific search space), where '00' indicates that CSI was not triggered. '01' indicates that the downlink component carrier SIB-2 linked to the uplink component carrier for transmitting the CSI report is triggered, and what '10' and '11' indicate may be set by the RRC.
  • '0' indicates that CSI is not triggered, and what '1' indicates may be configured by RRC.
  • the RRC can set any carrier aggregation combination up to five component carriers.
  • '10' or '11' may be an indication of a subset of the 'configured component carrier' by RRC signaling, and the base station and the terminal may recognize this by PDCCH signaling.
  • PDCCH signaling may be applied to a subset of 'configured component carriers' defined by '10' or '11'.
  • the size of the payload may be determined depending on a subset of the 'configured component carriers' which are predetermined by the RRC and triggered by the PDCCH, not the entire set of configured component carriers.
  • SIB-2 linkage (linkage) relationship can be regarded as one of the subset of the 'configured component carrier'. That is, in this case, SIB-2 connected downlink component carriers are reported according to a given reporting mode (even if the number of configured component carriers is greater than 1). You can.
  • each SIB (System Information Block) includes different system information, the information required for the UE to access the cell, the downlink component carrier and the link information of the uplink component carrier, etc. are indicated by the SIB-2.
  • the downlink sub-carrier 610, the uplink sub-carrier 640, the downlink sub-carrier 620, and the uplink sub-carrier 650 have a linkage relationship with each other.
  • the link subcarrier 630 does not have an uplink component carrier having a connection relationship.
  • the link relationship between these downlink component carriers and the uplink component carrier may be indicated by SIB-2.
  • the connection configuration of the uplink component carrier and the downlink component carrier may be set to be cell specific or UE specific.
  • CSI for a linked downlink component carrier for example, CQI / PMI (Precoding Matrix Indicator) / RI (Rank Indicator), etc., are transmitted.
  • control channel of the downlink component carrier carries only control information for the linked uplink component carrier.
  • FIG. 6 is a diagram schematically illustrating an example in the case where there is no intercarrier scheduling in carrier aggregation.
  • a downlink major carrier (PCC) 710 is linked with an uplink major carrier (PCC) 740, and a downlink first subcarrier (SCC1, 720) is an uplink subcomponent carrier (SCC). , 750).
  • PCC downlink major carrier
  • SCC1, 720 downlink first subcarrier
  • SCC uplink subcomponent carrier
  • scheduling can be performed without requiring CIF. This is referred to as a self scheduling mode.
  • inter-carrier scheduling it is called a cross-carrier scheduling mode and CIF is necessary.
  • an extension carrier may be defined.
  • a carrier other than an extended carrier is usually called a component carrier.
  • the extended carrier does not include a control region and the existing PDCCH is not transmitted on the carrier.
  • a common reference signal CRS
  • the extended carrier is configured based on a DM RS (Demodulation Reference Signal).
  • Scheduling for the extended carrier region is basically considered inter-carrier scheduling.
  • the enhanced PDCCH is considered to be applied not only to the extended carrier but also to the component carrier.
  • the control region portion which is the front part of the time axis, is excluded from the region of the enhanced PDCCH.
  • Activation / deactivation of component carriers is applied to carrier aggregation.
  • a carrier aggregation environment it may be considered to dynamically transmit variable resource allocation information for individual component carriers or a plurality of component carriers through one PDCCH.
  • the base station individually designates resource allocation information for each component carrier, a system-defined value may be used.
  • the concatenation logically means concatenation between component carriers, and the physical positions on the frequency axis may not be concatenated with each other.
  • a base station dynamically transfers resource allocation information for CCs in one PDCCH in a carrier aggregation environment.
  • the information on the size of the resource block group for the CC is described as an example of resource allocation information.
  • the base station may dynamically change the size of a resource block group (RBG) in a resource allocation field of the PDCCH. That is, the base station may dynamically change the size P of the resource block group scheduled for the UE, and transmit the same to the UE through the resource allocation field on the PDCCH.
  • RBG resource block group
  • a resource block or a resource block group may be allocated to a terminal by forming a resource block group for each component carrier. For resource blocks allocated for each component carrier, resource blocks and resource block groups allocated for a plurality of component carriers may be allocated. It may be contiguous to form one resource block group.
  • the base station may schedule the connected resource block group as a resource allocated to the terminal, and may transmit the size of the scheduled resource block group to the terminal as one PDCCH.
  • one resource block group may be configured of four resource blocks.
  • the base station may schedule and signal for each of the component carriers so that the size of the resource block group allocated to the two 20MHz band component carriers to be 4, and the two component carriers so that the size of the allocated resource block group is 8 It can be scheduled by signaling for. At this time, the base station may perform this operation dynamically.
  • scheduling may be coarse when resource allocation is performed for all two CCs, that is, when the size of a resource block group is 8, scheduling is possible for two CCs with one PDCCH.
  • the resource allocation field of the PDCCH can be efficiently utilized.
  • component carriers configured to be concatenated by scheduling individual component carriers in a component carrier group are referred to as a component carrier subgroup.
  • Scheduling for the component carrier subset may be performed by one PDCCH.
  • the base station may allocate resources to all component carriers constituting the component carrier subset, and in the case of individual component carriers, newly set by concatenating resource blocks or resource block groups allocated in series. Can be scheduled.
  • the resource block group for the new resource space formed by concatenating resource blocks or resource block groups allocated to individual component carriers is referred to as 'resource for subsets'. Block group.
  • the size of the resource block group for the subset may be determined by a higher layer, may be determined in consideration of the configuration of the component carrier, and is transmitted to the terminal through a resource allocation field of the PDCCH.
  • the transmission mode of the CC may be the same or different between CCs constituting the CC group.
  • common control information and / or transmission information may be transmitted to a control region other than the resource allocation field among the control regions on the PDCCH.
  • a size information set specific to the terminal may be determined by higher layer signaling.
  • the terminal which has received the size information set by higher layer signaling of the base station, may check the size of the resource block group corresponding to the information transmitted in the resource allocation field on the PDCCH from the size information set.
  • the size information set may be configured by three components having the size of the resource block group basically set in the system as a basic unit.
  • the size information set may be configured such that the set component (size of the resource block group) is a multiple of four.
  • the size information set may be configured with three components that do not have the size of the resource block group basically set in the system as a basic unit. For example, in case of LTE, even if the size P of the assumed resource block group is basically 4, the three components of the size information set, that is, the size of the resource block group may not be a multiple of four.
  • the base station may configure the size information set by determining the size of the resource block group for the component carrier subsets.
  • the component carrier set may be obtained from all the configured component carriers or may be obtained only from the activated component carriers.
  • 'configured component carrier' means component carriers determined to be used semi-statically by higher layer signaling, and 'activated component carrier' is more dynamically determined by MAC signaling and only PDCCH information Means the component carriers to be blind decoded.
  • the size information set is a component carrier subset that can be composed of component carriers of a component carrier set, a code point corresponding to the component carrier subset, and / or a resource block group for each component carrier subset. It may be a size information table consisting of the size of the.
  • the size of the resource block group may be 8 in the above description.
  • the component carrier subset consists of two 20 MHz band component carriers.
  • a component carrier set including a component carrier 0 having a band of 20 MHz and a component carrier 1 having a band of 10 MHz and a component carrier 2 having a band of 10 MHz may be considered.
  • the size of the resource block group for the component carrier subset can be determined in the upper layer, the size information set consisting of the size (P) of the resource block group may be delivered to the terminal through higher layer signaling.
  • the size of the resource block group for the CC set may be determined based on the configuration of the CC set.
  • Equation 4 Equation 4 below may be used.
  • the size (P) of the resource block group is Can be determined through operation.
  • a ⁇ P ⁇ A + 1 (A is an integer)
  • the value may be determined as A + 1.
  • all component carriers in the component carrier subset may be all configured component carriers in the component carrier subset or all activated component carriers. In this case, whether all component carriers in the component carrier subset are all configured component carriers or all activated component carriers may be predetermined between the base station and the terminal, It may be delivered.
  • the 'reference component carrier' may be a component carrier file having a maximum band in the component carrier set, a component carrier file of a predetermined specific band, may be a component carrier file to which a PDCCH is transmitted, or may be indicated by the PDCCH (in the PDCCH).
  • Element carrier file indicated by the location of PDSCH or PUSCH.
  • a 'reference component carrier' whether to refer to the component carrier having the maximum band within the component carrier set, to a component carrier of a predetermined specific band, to the component carrier to which the PDCCH is transmitted, or to the PDCCH Whether to base on the CC indicated by the PDCCH (indicated by the location of the PDSCH or the PUSCH) may be predetermined between the base station and the terminal or may be delivered to the terminal through higher layer signaling.
  • the component carrier having the maximum band is the component carrier 0 with respect to the subset of the component carrier 0 having the band of 20 MHz and the component carrier 1 having the band of 10 MHz.
  • the number of resource blocks in the subset of component carrier 0 and component carrier 1 is 150 (component carrier 0: 100, component carrier 1: 50), and the number of resource block groups of component carrier 0 is 25. . Accordingly, the size P1 of the resource block group for the component carrier subset is six.
  • the component carrier 1 and the component carrier 2 since the component carrier 1 and the component carrier 2 have the same band of 10 MHz, the component carrier having the maximum band becomes both the component carrier 1 and the component carrier 2.
  • the number of resource blocks in the subset of component carrier 1 and component carrier 2 is 100 (component carrier 1: 50, component carrier 2: 50), and the resource block group of component carrier 1 or component carrier 2 The number is 17. Therefore, the size P2 of the resource block group for the subset is six.
  • the reference component carrier becomes component carrier 1 or component carrier 2.
  • the number of resource blocks in the subset of component carrier 0 and component carrier 1 is 150 (component carrier 0: 100, component carrier 1: 50), and resource block group of component carrier 1 Since the number of ns is 17, the size P1 of the resource block group is 10 according to equation (4).
  • the number of resource blocks in the subset of the component carrier 1 and the component carrier 2 is 100 (component carrier 1: 50, component carrier 2: 50), and component carrier 1 Since the number of resource block groups of and CC2 is 17, the size P2 of the resource block group is 6 by Equation 4.
  • a component carrier in which a control channel region PDCCH exists may be used as a 'reference component carrier'.
  • the size (P) value of the combined resource block group may be determined based on the band of the major carrier.
  • component carrier 1 is a component carrier on which a PDCCH is transmitted.
  • the number of resource blocks in the subset of component carrier 0 and component carrier 1 is 150 (component carrier 0: 100, component carrier 1: 50), and resource of component carrier 1
  • the number of block groups is 17. Therefore, the size P1 of the resource block group for the subset is nine.
  • the number of resource blocks in the subset of Component Carrier 1 and Component Carrier 2 is 100 (component carrier 1: 50, component carrier 2: 50), and resource of component carrier 1
  • the number of block groups is 17. Accordingly, the size P2 value of the resource block group for the subset is six.
  • Equation 4 it is possible to use the component carrier indicated by the control channel region (PDCCH) as the PDSCH or PUSCH position as the 'reference component carrier'.
  • the component carrier where the PDSCH indicated by the PDCCH is located is the component carrier 1.
  • the number of resource blocks in the subset of component carrier 0 and component carrier 1 is 150 (component carrier 0: 100, component carrier 1: 50), and resource of component carrier 1
  • the number of block groups is 17. Therefore, the size P1 of the resource block group for the subset is nine.
  • the number of resource blocks in the subset of Component Carrier 1 and Component Carrier 2 is 100 (component carrier 1: 50, component carrier 2: 50), and resource of component carrier 1
  • the number of block groups is 17. Accordingly, the size P2 value of the resource block group for the subset is six.
  • the allocated resource region is determined.
  • the resource allocation area can be extended by logically and serially connected to each other.
  • the P value may be determined using Equation 4, the P value may be arbitrarily determined for each component carrier subset.
  • the configuration of the subset is known from the base station to the terminal by higher layer signaling (eg MAC or RRC signaling).
  • higher layer signaling eg MAC or RRC signaling
  • a value connected to each component carrier subset is notified from the base station to the terminal in advance by higher layer signaling (for example, MAC or RRC signaling) as in the configuration of the component carrier subset.
  • FIG. 7 is a diagram schematically illustrating a method of configuring a resource block group size, that is, a method of configuring a resource block group for a component carrier subset, in a system to which the present invention is applied.
  • a component carrier subset 820 of component carrier 0 and component carrier 1 among component carrier sets 810 composed of set component carrier 0 (CC0), component carrier 1 (CC1), and component carrier 2 (CC2).
  • CC0 component carrier 0
  • CC1 component carrier 1
  • CC2 component carrier 2
  • the component carrier 0 has a band of 20 MHz
  • the resource block group size P0 for the resource region 830 allocated to the component carrier 0 is 4, and the number of resource block groups is 25.
  • the component carrier 1 has a band of 10 MHz
  • the size P1 of the resource block group for the resource region 840 allocated to the component carrier 1 is 3, and the number of resource block groups is 17.
  • the size P of the resource block group for the component carrier subset 820 is determined using Equation 4.
  • the component carrier having the maximum band is defined as a reference component carrier.
  • the serially connected band of the two component carriers is 30 MHz, and the resource for component carrier subset 820 is determined.
  • the size P of the block group is calculated as in Equation 5 below using Equation 4.
  • the size (P) value of the resource block group may be transmitted independently of the resource block group of the reference CC. That is, a set of size (P) values of a resource block group may be previously transmitted from a base station to a terminal through higher layer signaling, and the size (P) value of a specific resource block group may be dynamically allocated by the PDCCH in this set. have.
  • the resource block or the resource block group may be started from the component carrier in which the PDCCH exists or the component carrier indicated by the PDCCH.
  • the beginning and the end of the resource space newly configured in the present invention may be defined as follows.
  • the following cases also apply when the P value is not determined according to Equation 4 even when the component carrier subset is determined.
  • Equation 4 is applied to the component carrier subset, all resource blocks or all resource block groups for the component carrier subset may be configured as a new resource space.
  • the resource allocation area may be a serially connected resource area according to the order of the CIFs. If the CIF is present, the resource allocation region may be a resource region serially connected in CIF order starting from the component carrier designated by the CIF. If there is no CIF, it may be a resource region serially connected in a cell index order from a cell (component carrier) designated by the PDCCH.
  • the cell index means a number indicating the order between cells (component carriers) defined in the system.
  • the end point of the resource allocation region may be determined by the size P of the resource block group. Accordingly, the base station can allocate the resource for the terminal by transmitting the size (P) of the resource block group on the PDCCH.
  • Information on the size of the dynamically scheduled resource block group may be signaled on the PDCCH, and a method of adding a new field to the PDCCH or utilizing an existing field may be used.
  • a method of adding a new field to the PDCCH and using the existing field together may also be used.
  • a new field of a certain bit may be added to the PDCCH, and the size P of the resource block group may be dynamically transmitted to the UE through the corresponding field.
  • the size P of the transmitted resource block group may be one of a size information set previously determined by higher layer signaling or the like between the base station and the terminal.
  • Table 5 schematically shows a size information table as an example of the size information set available when the added bit is 1 bit.
  • the terminal and the base station uses Table 5
  • Table 6 schematically shows a size information table as an example of the size information set available when the added bit is 2 bits.
  • the base station transmits only information on the component carriers constituting the component carrier subset in the component carrier set on the PDCCH to the terminal.
  • the UE may determine the size P of the resource block group for the component carrier subset through Equation 4 described above.
  • the size of the resource block group for the component carrier subset with the information on the component carriers constituting the component carrier subset may be delivered to the terminal on the PDCCH.
  • Table 7 schematically shows a size information table as an example of the size information set available when the added bit is 1 bit.
  • the base station delivers the code point 0, the component carrier to the component carriers belonging to the component carrier subset 0
  • a subset may be configured, and the size of the resource block group may be indicated to be P0.
  • the UE may be allocated a resource block group having a size of P0.
  • the base station may also transmit code point 1 to configure the component carrier subset with component carriers belonging to component carrier subset 1, and indicate that the size of the resource block group is P1.
  • the terminal may be allocated a resource block group having a size of P1.
  • Table 8 schematically shows a size information table as an example of the size information set available when the added bit is 2 bits.
  • the base station transmits a code point, so that the component carrier subset and the corresponding resource block group as shown in Table 8 You can indicate the size.
  • the component carrier subset may consist of one specific component carrier, may be composed of a plurality of component carriers, or may indicate an entire component carrier.
  • the size P of the corresponding resource block group may be the size of the corresponding band resource block group defined in the LTE system.
  • the size P of the resource block group for the subset may be directly transmitted using the size information set, or may be determined using Equation 4 without being defined in the size information set. Whether to use Equation 4 or which component carrier to use as a reference component carrier may be transmitted through higher layer signaling.
  • the base station may dynamically determine the size P of the resource block group in the size information set and transmit it to the terminal through a newly added field on the PDCCH.
  • the base station may transfer the size P of the resource block group to the terminal as described above by dedicating bits allocated to the unutilized field.
  • the size P of the resource block group may be transmitted using code points other than the code points for the component carriers constituting the component carrier set among the code points of the CIF. Can be.
  • the component carrier set consists of up to five component carriers
  • 5 to 7 of CIF values of 0 to 7 may be utilized.
  • Table 9 schematically shows a size information table as an example of the size information set that can be used when using the CIF as a conventional field for transmitting the size of the resource block group.
  • the base station transmits 5 to 7 of the code point of the CIF, and as shown in Table 9 the subset of the component carrier and corresponding The size of the resource block group may be indicated.
  • the component carrier subsets 0 to 2 may be configured by one specific component carrier, may be configured by a plurality of component carriers, or may indicate all component carriers.
  • the sizes P0 to P2 may be directly transmitted using the size information set, or may be determined using Equation 4 according to the component carrier set. Whether to use Equation 4 or in which case, based on which component carrier may be transmitted through higher layer signaling or the like.
  • the setting of the size information set may be determined in a higher layer (eg, RRC layer) and may be delivered to the terminal through higher layer signaling (eg, RRC signaling).
  • a higher layer eg, RRC layer
  • RRC signaling e.g, RRC signaling
  • New fields can be added for signaling. For example, by adding a new 1-bit field, when the added 1 bit is 0, the existing field is used as it is, and when the added 1 bit is 1, the existing field is described as' (1) New field. It can be used as a bit for transmitting the size (P) of the resource block group as described in the 'additional signaling method.
  • the base station may add a new 1 bit to the CQI request field and transmit it to the terminal.
  • the UE may recognize the CQI request field as originally related to the CQI request and perform an operation accordingly.
  • the UE may recognize the CQI request field having 1 to 2 bits as transferring the size P of the resource block group and operate accordingly.
  • the base station may configure the information transmitted in the CQI request field as indicated by the new bit. For example, when the new 1 bit is 0, the base station transmits a CQI request message in the CQI request field, and when the new 1 bit is 1, the base station sets the size P of the resource block group in the CQI request field. To pass.
  • the CQI request field has been described as an example of the existing field.
  • the existing field available for signaling using the existing field and the new field is not limited thereto, and the same method is used for the CIF or Modulation and Coding Scheme (MCS) field. It can be used as. That is, if the value of the newly added field is 0, the CIF or MCS field is used as the CIF and MCS field as the original value. If the value of the newly added field is 1, the bit allocated to the CIF or MCS field is used. It can be dedicated to sending the size of a group.
  • MCS Modulation and Coding Scheme
  • the above-described configuration regarding a method of signaling by using an existing field and a new field together may be determined at a higher layer (eg, an RRC layer), and may be delivered to a terminal through higher layer signaling (eg, RRC signaling).
  • a higher layer eg, an RRC layer
  • RRC signaling e.g, RRC signaling
  • the above-described methods of the present invention apply equally to the case of an extended carrier.
  • the case of using intercarrier scheduling is as described above.
  • scheduling of an extended carrier can be easily configured by the scheme proposed by the present invention.
  • the order for logical connection between the extended carrier and another carrier may be determined by higher layer signaling.
  • the enhanced PDCCH may be applied regardless of whether the extended carrier is present or the present invention may be applied to the case where the enhanced PDCCH is applied to the existing component carrier and the extended carrier as in the case of the existing PDCCH.
  • variable configuration of the resource block group in the resource allocation has been described by applying to the carrier aggregation, the technical idea of the present invention can be further extended.
  • the component carrier considered in the present invention may be considered as a cell concept. Accordingly, variable control information transmission using a single PDCCH described for a multi-component carrier may be applied to a cell. That is, the size of the resource block group allocated to the UE for the multiple cells can be determined and transmitted on one PDCCH.
  • the cell in the case of extending and applying the above-described concept of CC to a cell, the cell is considered in a CoMP (Coordinated Multi-Points) environment as well as a primary serving cell that performs scheduling for the UE. And a neighboring cell, a main radio serving internal and external remote radio head (RRH), and a relay for relaying between the base station and the terminal.
  • the base station (main station) of the primary serving cell may connect resource block groups allocated for each cell included in CoMP, and transmit size information of the connected resource block group to the UE on a single PDCCH.
  • cell subsets For cells, a resource block group connecting resource block groups allocated to individual cells is called a resource block group for a subset.
  • UE-specific resource allocation may be made by a single PDCCH from the base station.
  • the cell subset may consist of one cell.
  • a UE may receive a signal from multiple cells, and a signal transmitted from the UE may also be received in multiple cells. If downlink transmissions from such multiple cells are coordinated, that is, downlink transmission is performed from multiple cells geographically separated, downlink performance can be greatly improved.
  • cell selection for transmitting data to the terminal may be dynamically performed. That is, for the terminal, immediate data transmission can be made from any one of multiple cells included in CoMP.
  • scheduling including beamforming functionality, is dynamically associated between multiple cells, thereby allowing to adjust or reduce interference between different transmissions.
  • data for a single terminal may be simultaneously transmitted from multiple cells. Therefore, the quality of the received signal can be improved and the interference can be reduced.
  • Uplink CoMP reception is to receive the transmitted signal in geographically separated multiple cells, and scheduling for each multiple cell can be linked to reduce interference.
  • RRH Remote Radio Head
  • RF radio frequency
  • a / D converter Analogue to Digital Converter
  • FIG. 8 is a diagram schematically illustrating the application of the present invention to a system consisting of a main serving cell, a neighboring cell, and an RRH as an example of a system to which CoMP is applied.
  • FIG. 8 illustrates an example of a system to which CoMP is applied, in which a base station (main station) 900 of a main serving cell, a base station (sub-base station 910) of a neighboring cell, and two RRHs 920 and 930 in the main serving cell are connected to a terminal (see FIG. 8).
  • 940 shows CoMP transmission.
  • a communication link is established between the main station 900 and the terminal 940 so that the PDCCH of the main station 900 is transmitted to the terminal 940, and the terminal 940 needs control information from the PDCCH.
  • the main base station 900 and each of the transmission points 920 and 930 are connected through a backhaul channel.
  • the main station 900 and the subsidiary station 910 may be connected through an X2 interface, and the main station 900 and the RRHs 920 and 930 may be connected through a wired network.
  • the main station 900 may exchange data and / or control information necessary for CoMP transmission with the sub-station 910 and the RRHs 920 and 930 through a wired channel.
  • control information for the sub-station base station 910, RRH (920, 930) in relation to the resource allocation can be determined and transmitted by the main station 900 alone.
  • control information transmitted from the main base station 900 to the terminal 940 on the PDCCH may include resource allocation information for each cell included in CoMP.
  • the main base station 900 concatenates resource blocks (groups) for a plurality of cells (cell subsets) with respect to resource blocks allocated for each cell included in CoMP, thereby concatenating resource block groups (resource block groups for subsets). ) And transmit the size of the connected resource block group to the UE 940 as one PDCCH.
  • the UE specific size information set may be used by higher layer signaling.
  • the terminal receiving the size information set by higher layer signaling may check the size of the resource block group corresponding to the information transmitted in the resource allocation field on the PDCCH from the size information set.
  • the size of the resource block group may be determined for the cell subsets that may be configured from the set of cells included in CoMP, thereby configuring the size information set.
  • the size information set may be a size information table including cell subsets, code points corresponding to the cell subsets, and / or sizes of the combined resource block group for each cell subset.
  • the size P of the resource block group for the cell subset may be determined as shown in Equation 6 in consideration of the cell combination, in addition to the method of transferring the size information set as described above.
  • the size (P) of the resource block group is Can be determined through operation.
  • a ⁇ P ⁇ A + 1 (A is an integer)
  • the value may be determined as A + 1.
  • 'all cells in the cell subset' indicates a cell included in CoMP to which resource blocks (groups) are connected.
  • the 'predetermined reference cell' may be a cell using a maximum band in a cell set, a cell using a predetermined specific band, a primary serving cell to which a PDCCH is transmitted, or a cell indicated by a PDCCH. .
  • Equation 6 or 'predetermined reference cell' which cell to use may be predetermined between the main station and the terminal, or may be delivered to the terminal through higher layer signaling.
  • the band used for each cell, the number of resource blocks, the size of the resource block group, and the number of resource block groups according to each cell may be given as shown in Table 3 as in the case of the component carrier.
  • the main base station 900 concatenates the resource blocks for the RRH 930 and the sub-station 910 on the PDCCH to form a resource block group, and designates the size (P) of the resource block group to 6 for transmission. have.
  • the main base station 900 uses a 15 MHz band and defines as a reference cell a cell to which the maximum band in the cell set is allocated.
  • the size P of the resource block group is nine. In the case where it is determined to use the primary serving cell as the reference cell, the size P of the resource block group is eight.
  • the size of the resource block group may be delivered to the terminal on a single PDCCH transmitted by the main station 1200. However, when using Equation 6, even if the size of the resource block group is not explicitly transmitted from the main station 900, the terminal 940 may calculate the size of the resource block group from the information on the cell subset. have.
  • the main station 900 configures a size information set with sizes of schedulable resource block groups, and indicates a size of a resource block group to be allocated to a terminal among sizes of resource block groups constituting the size information set.
  • the code point may be transmitted to the terminal on the PDCCH.
  • a size information set used to process information about a size of a resource block group between a main station and a terminal may be configured with a size information table as shown in Table 10.
  • the main station may indicate the size of the cell subset to be scheduled and the size of the resource block group thereof by sharing the size information set with the terminal and transmitting a code point on the size information set to the terminal. For example, when the main station transmits the code point A0 on the PDCCH using Table 10, the UE may confirm that the resource block group for the cell subset 0 is allocated to the size of P0.
  • the size information set (size information table) used by the main base station and the terminal may be configured to exclude the size P of the resource block group.
  • the cell subset may be composed of one cell.
  • the information about the size of the resource block group transmitted on the PDCCH may be delivered by adding a new field to the PDCCH, or may be transmitted by using a conventional field on the PDCCH, adding a new field and It can also be passed along with the field.
  • the number of code points and the size information set may be configured differently.
  • a size information set is composed of a code point of 0 or 1 and two different size information, and any one of two different size information is transmitted to the terminal. I can deliver it.
  • the size information set is composed of four sign points of 00, 01, 10, and 11 and four different size information. Any one of the information may be delivered to the terminal.
  • the main station may transmit a code point corresponding to the size information to be transmitted to the terminal by using a field that is already defined but not utilized, as in the case of the component carrier. Even for a conventional field already in use, when adding a new field of 1 bit and specifying the value of the added field as 0, the conventional field is used for the conventional purpose and the value of the added field is set to 1. In the case of designation, a method of dedicating a conventional field to transmitting resource allocation information may be used.
  • FIG. 9 is a flowchart schematically illustrating an operation performed by a base station in a system to which the present invention is applied.
  • the base station configures a component carrier subset among the component carriers of the component carrier set (S1010).
  • the base station operates as a main station and constitutes a cell subset among the cells (cells in a cell set) included in CoMP.
  • the base station determines whether to transmit the size information of the resource block group to the terminal (S1020).
  • the base station may transmit control information including information on resource allocation on the PDCCH to the terminal.
  • the resource allocation information may be UE-specific information and may include information about the CC component, and includes information about the size of the resource block group for the subset along with information about the CC component. There may be.
  • the base station may transmit control information including information on resource allocation on the PDCCH as a main station of the CoMP system to the terminal.
  • the resource allocation information may be UE-specific information and may include information about a cell subset, and may include information about the size of the resource block group for the subset together with information about the cell subset. have.
  • the information about resource allocation transmitted between the base station and the terminal may be transmitted using the size information set of the resource block group, where the size information set is used for information and / or subset about the component carrier (or cell) subset. It may be a size information table consisting of the size of the resource block group for the corresponding code point.
  • the size information set (size information table) may be delivered to the terminal in advance through higher layer signaling (MAC or RRC), and the base station indicates a resource block group to be allocated on the size information set (size information table) as described above. Resource allocation information can be delivered to the terminal by selecting a code point to be transmitted to the terminal.
  • the base station determines the size of the resource block group for the subset together with information of the component carrier subset or cell subset. It transmits to (S1030).
  • the base station transmits information of the CC set or the cell subset to the UE (S1040).
  • the size of the resource block group for the subset can be obtained by the terminal using Equation 4 or Equation 6.
  • the configuration of the CC group is performed, and then the decision is made to determine whether to transmit the resource block group by specifying the size.
  • the present invention is not limited thereto. (Cell) subset can also be comprised.
  • it may be determined in advance by an upper layer or the like.
  • FIG. 10 is a flowchart schematically illustrating an operation performed by a terminal in a system to which the present invention is applied.
  • the terminal receives control information on resource allocation on a PDCCH (S1110).
  • the terminal may check whether the received control information includes information on the size of the resource block group (S1120).
  • the control information may include only information on the component carrier subset, or may include information on the size of the corresponding resource block group together with information on the component carrier subset.
  • the control information may include only the information about the cell subset, or may include information about the size of the corresponding resource block group together with the information about the cell subset.
  • Information on resource allocation transmitted between the base station and the terminal may be transmitted using the size information set of the resource block group.
  • the size information set (size information table) may be delivered to the terminal in advance through higher layer signaling (MAC or RRC).
  • MAC or RRC higher layer signaling
  • the terminal is a resource in which the received code point indicates on the size information set (size information table).
  • a block group can be obtained.
  • the terminal When receiving information on the size of the resource block group, the terminal applies the received size information to the resource block group for the component carrier (cell) subset included in the control information (S1130).
  • the terminal calculates the size of the resource block group for the component carrier (cell) subset included in the control information (S1140).
  • the UE may calculate the size of the resource block group by using Equation 4 for the component carrier subset and Equation 6 for the cell subset.
  • the UE calculates the size of the resource block group according to whether the resource block group size information is received. However, this is for convenience of description, and whether the UE calculates the size of the resource block group is higher layer signaling.
  • the terminal may calculate or may not calculate the size information according to the indication of the higher layer signaling regardless of whether the size information of the resource block group exists in the received control information.
  • the UE may acquire an allocated resource through control information on the PDCCH (S1150).
  • the terminal When receiving the size of the resource block group, the terminal is a resource block group (resource block group for the subset) configured by concatenating the resource block group for the component carrier (cell) of the component carrier (cell) subset.
  • the resource block group having the size indicated by the received size information can be obtained.
  • the terminal is connected to the resource block group (subset) configured by concatenating the resource block group for the component carrier (cell) of the component carrier (cell) subset included in the control information.
  • Resource block group a resource block group having a size calculated by Equation 4 or 6 can be obtained.
  • FIG. 11 is a block diagram schematically illustrating a configuration of a terminal and a base station in a system to which the present invention is applied.
  • the terminal 1200 includes an RF unit 1210, a memory 1220, and a processor 1230.
  • the terminal 1200 communicates with the base station through the RF unit 1210.
  • the terminal 1200 may communicate with multiple cells through the RF unit 1210.
  • the memory 1220 stores information necessary for the terminal 1200 to perform communication in the system.
  • the memory 1220 may store a set of size information shared with the base station regarding resource allocation in order to acquire a resource.
  • the size information set may be received through the RF unit 1210 through higher layer signaling.
  • the processor 1230 is connected to the RF unit 1210 and the memory 1220 to control them, and may perform the functions proposed in the present invention.
  • the processor 1230 may acquire a resource to be used for uplink transmission according to the control information on the PDCCH transmitted from the base station.
  • the processor 1230 configures a resource block group for an element carrier or a cell subset indicated by information transmitted in a resource allocation field on the PDCCH, and depends on the size of the indicated resource block group or on the calculated size of the resource block group. Thus, resources can be obtained.
  • the base station 1240 includes an RF unit 1250, a memory 1260, and a processor 1270.
  • the base station 1240 transmits and receives necessary information through the RF (1250).
  • the base station 1240 may transmit control information about resource allocation on the PDCCH through the RF unit 1250 or may transmit higher layer signaling.
  • the base station 1240 operates as a main station, and may transmit and receive using the RF unit 1260 including RRHs in and out of cells.
  • the memory 1260 may store information necessary for the base station 1240 to operate the system.
  • the memory 1260 may store a size information set shared with the terminal 1200 regarding resource allocation.
  • the size information set may be transmitted to the terminal 1200 through the RF unit 1250 through higher layer signaling.
  • the memory 1260 may store information of each cell received through the backhaul channel.
  • the processor 1270 is connected to the RF unit 1250 and the memory 1260 to control them and perform the functions proposed in the present invention.
  • the processor 1270 may also include a resource allocator 1280 that performs an operation related to resource allocation.
  • the processor 1270 or the resource allocating unit 1280 included in the processor 1270 designates a predetermined component carrier subset in the carrier aggregation environment to allocate a resource block group for the component carrier subset to the terminal 1200. Information related to the terminal may be transmitted to the 1200.
  • the processor 1270 or the resource allocator 1280 included in the processor 1270 may designate a predetermined cell subset in the CoMP system to allocate a resource block group for the cell subset to the terminal 1200 and information on the same. It may be delivered to the terminal 1200.
  • the processor 1270 or the resource allocator 1280 included in the processor 1270 may transmit information required for resource allocation to the terminal using the size information set stored in the memory 1260.
  • a situation in which the number of PDCCHs that can be provided to an existing control area may be limited. Accordingly, in order to maximize the efficiency of the PDCCH of the existing communication scheme and the PDCCH of the MU-MIMO or CoMP scheme, resource allocation for one or more PDSCHs in a CC or a cell or transmission point using one PDCCH is performed. Method is required.
  • the transmission point is a concept including both a base station, a pico base station (Pico base station), a femto base station (Femto base station) or a remote radio head (RRH). If the PDCCH is limited to indicating only one PDSCH for one component carrier or one cell or one transmission point to indicate multiple PDSCHs, the range of PDSCH assignments that can be obtained in the control region of limited resources is limited. Can be enlarged.
  • PDCCH bundling One PDCCH indicating two or more PDSCHs may be called PDCCH bundling, and such a PDCCH is called a bundling PDCCH. Two methods may be supported for PDCCH bundling.
  • blind decoding defines a constant decoding start point in the region of a given PDCCH, performs decoding for all possible DCI formats in a given transmission mode, and detects a user from a Cell-Radio Network Temporary Identifier (C-RNTI) masked in a CRC. Decoding method of control information to distinguish.
  • C-RNTI Cell-Radio Network Temporary Identifier
  • the blind decoding means that the decoding complexity increases according to the number of DCI formats to be decoded, and the difference in DCI size means that the number of DCI formats to be decoded increases.
  • increasing the size of the PDCCH causes deterioration of PDCCH performance.
  • the size of the format of the new DCI mapped to the bundling PDCCH is maintained in the size of the existing DCI format or newly defined by replacing the existing DCI format with a slight increase in size. As a result, it is possible to obtain an existing system without adding a new transmission mode.
  • transmission mode 1 represents a single antenna transmission mode and blind decoding may be assumed for DCI format 0 / 1A (small size) and DCI format 1 (large size).
  • a new DCI format indicating two PDSCHs having the same size as DCI format 1 may be defined.
  • Various compression methods can be used to fit the new DCI format to the size of DCI format 1.
  • the size of the resource block to which the PDSCH is mapped may be changed.
  • the pattern for allocating the resource to which the PDSCH is mapped is changed to be represented with a smaller number of bits.
  • the existing method of indicating a resource with a bitmap such as a type 0 resource allocation scheme is changed to a method of indicating a plurality of consecutive resource blocks such as a type 2 resource allocation scheme.
  • a resource block to which one PDSCH is mapped is a 17-bit length. It can be represented as a bitmap.
  • the resource block group to which the first PDSCH is mapped is 25x26 / 2.
  • one PDCCH may indicate only one PDSCH as 17 bits, whereas in Type 2, one PDSCH may indicate two PDSCHs as 17 bits.
  • This scheme can be applied to other DCI formats that use bitmap type resource allocation, such as DCI format 2 / 2A / 2B / 2C.
  • the MCS value of DCI mapped to one bundling PDCCH is commonly applied to multiple PDSCHs.
  • the HARQ parameter of DCI mapped to one bundling PDCCH may be commonly applied to multiple PDSCHs or may be independently applied.
  • the HARQ parameter includes a new data indicator (NDI), a redundancy version (RV), and a HARQ index.
  • the HARQ parameter of DCI mapped to the bundling PDCCH is applied to only one PDSCH.
  • some or all of the HARQ parameters may be omitted or may have a specific value.
  • the new data indicator may be omitted
  • the duplicate version may be pre-qualified as set to a specific value
  • the HARQ index may be pre-qualified as set to an initial value.
  • an overhead of control information may be reduced because a HARQ parameter is not repeatedly transmitted, and a configuration of a new DCI format may be simplified.
  • bundling PDCCH an example used to be limited to the first transmission always configured with new data may be applied. This embodiment is useful in that the first transmission represents the majority (90% or more) of the data transmission.
  • the size of the existing PDCCH may be changed and replaced with a new PDCCH.
  • the ACK / NACK signal may be transmitted by any one of the following methods.
  • each of the plurality of PDSCHs includes a cyclic redundancy check (CRC) bit.
  • CRC cyclic redundancy check
  • the UE After performing an error check with CRC bits in each PDSCH, the UE performs a logical AND operation on the obtained result (1 for ACK and 0 for NACK) and outputs a final ACK / NACK signal.
  • each PDSCH may include a CRC bit when allocated to each CC in the form of a continuous cluster (bundling of consecutive resource blocks). However, it can proceed with one HARQ process.
  • the UE checks the CRC error only in the last PDSCH and generates an ACK / NACK signal and transmits it to the base station.
  • the HARQ parameter of the DCI mapped to the bundling PDCCH is commonly applied to the plurality of PDSCHs.
  • HARQ parameters are individually required and a configuration of a DCI format having a relatively large size is required.
  • the configuration of the large size DCI format is difficult to match the size of the existing DCI format of poor control channel transmission quality.
  • a plurality of PDSCHs transmit respective ACK / NACK information to proceed with an independent HARQ process for each PDSCH.
  • This has a negative effect on the compression side of the control information, but has a benefit in terms of data throughput. In this case, it has a disadvantage that can greatly affect the existing communication standard system.
  • a simple approach is to use 1 bit in the PDCCH as an identification field to identify the bundling PDCCH and the generic PDCCH. For example, when the identification field is 0, the conventional PDCCH operation may be indicated, and when the identification field is 1, the bundling PDCCH may be indicated. In this case, more complex parameters can be delivered by increasing the number of bits.
  • CIF may be used as an identification field for identifying a bundling PDCCH and a general PDCCH. As described above, in configuring a resource space, the CIF may be used to indicate a resource region connected in series over a plurality of CCs, which is a PDCCH including a CIF for a plurality of PDSCHs mapped to a resource region connected in series. Also includes the meaning of identifying that the bundling PDCCH.
  • the CIF not only indicates a single component carrier as a field for distinguishing component carriers, but also indicates a multi-component carrier or a multi-cell or multiple transmission point. If the value of CIF is 3 bits, for example, 0, 1, 2,... , 7 can be indicated. At this time, 0 to 4 of the values of the CIF identify a single component carrier, and up to 5 to 7 identify a multi-component carrier or a multi-cell or multiple transmission points. In other words, the specific range of values of the CIF indicates a multi-component carrier or multi-cell or multiple transmission point. On the other hand, if the value of the CIF indicates 5-7, it may indicate that the corresponding DCI is mapped to the bundling PDCCH.
  • the bundling PDCCH and the general PDCCH can be identified.
  • the UE may recognize the corresponding PDCCH as a bundling PDCCH.
  • the CIF values from 0 to 2 are allocated to individual component carriers, and the CIF values from 3 to 7 are multi-elements as shown in the following table. It may be defined as a carrier combination, multiple cells or multiple transmission points.
  • values 0, 1, and 2 of CIF indicate CC0, CC1, and CC2, respectively.
  • the bundling PDCCH indicates that both the PDSCH on CC0 and the PDSCH on CC2 are indicated.
  • the values 0, 1, and 2 of CIF indicate PCell, SCell 0, and SCell 1, respectively, and 3, 4, 5, 6, and 7 respectively indicate a multi-cell combination (SCell 0, SCell 1), (SCell 0, SCell). 2), (SCell 1, SCell 2), (SCell 0, SCell 1, SCell 2). That is, the values 3 to 7 of the CIF indicate that the bundling PDCCH indicates all of the plurality of PDSCHs in each of the multiple cells.
  • PCell is the primary serving cell
  • SCell means the secondary serving cell.
  • PCell refers to one serving cell that provides security input and NAS mobility information in an RRC connection or re-establishment state.
  • At least one cell may be configured to form a set of serving cells together with the PCell, wherein the at least one cell is called an SCell. Therefore, the set of serving cells configured for one terminal may be configured with only one PCell or may be configured with one PCell and at least one SCell.
  • the downlink component carrier corresponding to the PCell is referred to as a downlink component carrier (DL PCC)
  • the uplink component carrier corresponding to the PCell is referred to as an uplink component carrier (UL PCC).
  • the component carrier corresponding to the SCell is referred to as a downlink subcomponent carrier (DL SCC), and in the uplink, the component carrier corresponding to the SCell is referred to as an uplink subcomponent carrier (UL SCC).
  • DL SCC downlink subcomponent carrier
  • UL SCC uplink subcomponent carrier
  • the values 0, 1, and 2 of CIF indicate TP0, TP1, and TP2, respectively, and 3, 4, 5, 6, and 7 respectively represent multiple transmission point combinations (TP0, TP1), (TP0, TP2), and (TP1). , TP2) and (TP0, TP1, TP2). That is, the values 3 through 7 of the CIF indicate that the bundling PDCCH indicates all of the plurality of PDSCHs in each of the multiple transmission points.
  • Combinations are shown for each component such as component carriers, cells, and transmission points, but an embodiment as an indicator for a case where these components are combined is also possible. For example, embodiments such as (CC0, SCell 1, TP1, TP2) are possible.
  • the present invention transmits different resource allocation information through one control channel for a carrier aggregation environment, a multi-component carrier in a CoMP system, a coordinated cell (site), an associated RRH, and an associated relay. Can be applied when.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un appareil pour configurer de manière dynamique une unité d'attribution de ressources à l'intérieur d'un PDCCH pour une attribution de ressources efficace de porteuses à cellules multiples ou composantes multiples. Le procédé comprend les étapes qui consistent : à configurer au moins une porteuses dans un terminal ; et à transmettre, au moyen d'un canal de commande unique, des informations d'attribution de ressources pour indiquer des blocs de ressources concaténés à au moins une porteuse composante et attribués en tant que canaux de données, les informations d'attribution de ressources comprenant des informations concernant la taille d'un groupe de blocs de ressources qui définir l'unité de base d'attribution pour les blocs de ressources concaténés.
PCT/KR2012/001664 2011-05-02 2012-03-07 Appareil et procédé pour transmettre des informations d'attribution de ressources WO2012150762A2 (fr)

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WO2016119132A1 (fr) * 2015-01-27 2016-08-04 华为技术有限公司 Procédé, appareil et système de détermination d'un bloc de ressources
CN112543507A (zh) * 2019-09-23 2021-03-23 成都鼎桥通信技术有限公司 基于上行干扰的载波选择方法、装置、基站及存储介质
US20220405204A1 (en) * 2021-06-17 2022-12-22 Fujitsu Limited Computer-readable recording medium storing data placement program, processor, and data placement method
US11853211B2 (en) * 2021-06-17 2023-12-26 Fujitsu Limited Computer-readable recording medium storing data placement program, processor, and data placement method

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