WO2011074887A2 - 상향링크 및 하향링크 mimo를 지원하는 무선 통신 시스템에 있어서, 상향링크 또는 하향링크 그랜트를 전송하는 방법 및 장치 - Google Patents
상향링크 및 하향링크 mimo를 지원하는 무선 통신 시스템에 있어서, 상향링크 또는 하향링크 그랜트를 전송하는 방법 및 장치 Download PDFInfo
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- WO2011074887A2 WO2011074887A2 PCT/KR2010/009010 KR2010009010W WO2011074887A2 WO 2011074887 A2 WO2011074887 A2 WO 2011074887A2 KR 2010009010 W KR2010009010 W KR 2010009010W WO 2011074887 A2 WO2011074887 A2 WO 2011074887A2
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- uplink
- downlink
- grant
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting an uplink or downlink grant in a wireless communication system supporting uplink and downlink MIMO.
- a multi-carrier system or a carrier aggregation system is a group of one or more carriers having a band smaller than the target bandwidth when configuring a target broadband to support the broadband. Say your system.
- the band of the aggregated carriers may be limited to the bandwidth used by the existing system for backward compatibility with the existing IMT system.
- the existing 3GPP LTE system supports bandwidths of 1.4, 3, 5, 10, 15, and 20 MHz
- LTE-A LTE-Advanced
- a new bandwidth can be defined to support carrier aggregation regardless of the bandwidth used by the existing system.
- Multicarrier is a name that can be used interchangeably with carrier aggregation and bandwidth aggregation.
- the carrier set is a general term for both a contiguous carrier set and a non-contiguous spectrum aggregation.
- a single upper layer for example, a series of layers consisting of a MAC layer, an RRC layer, and a PDCP layer
- PHY layers that control each of multiple carriers. do.
- FIG. 1 is a diagram illustrating a concept of managing downlink component carriers in a base station
- FIG. 2 is a diagram illustrating a concept of managing uplink component carriers in a terminal.
- the upper layer will be briefly described as MAC in FIGS. 1 and 2.
- FIG. 3 is a transmission point of view of a base station.
- FIG. 1 is a diagram illustrating a concept in which one MAC manages multicarriers.
- 4 is a view illustrating a concept in which one MAC manages a multicarrier from a reception point of a terminal. In this case, in order to effectively transmit and receive multicarriers, both the transmitter and the receiver should be able to transmit and receive multicarriers.
- one MAC manages and operates one or more frequency carriers to transmit and receive.
- frequency carriers managed in one MAC do not need to be contiguous with each other, there is an advantage of being more flexible in terms of resource management.
- one PHY means one component carrier for convenience.
- one PHY does not necessarily mean an independent radio frequency (RF) device.
- RF radio frequency
- one independent RF device means one PHY, but is not limited thereto, and one RF device may include several PHYs.
- FIG. 5 is a diagram for explaining a concept in which one or more MACs manage a multicarrier from a transmission point of a base station.
- FIG. 6 is a view for explaining a concept in which one or more MACs manage a multicarrier from a reception point of a terminal.
- FIG. 7 is a diagram illustrating a concept in which one or more MACs manage a multicarrier from a transmission point of a base station.
- 8 is a view illustrating a concept in which one or more MACs manage a multicarrier from a reception point of a terminal.
- one or more multiple MACs may control multiple carriers instead of one MAC.
- each carrier may be controlled by one MAC, and as shown in FIGS. 7 and 8, each carrier is controlled by one MAC for some carriers.
- One MAC may control the remaining one or more carriers.
- the above system is a system comprising a plurality of carriers from 1 to N, and each carrier can be used adjacent or non-contiguous. This may be applied to the uplink and the downlink without distinction.
- TDD system it is configured to operate N multiple carriers while including downlink and uplink transmission in each carrier, and in case of FDD system, multiple carriers can be used for uplink and downlink, respectively. .
- bandwidths of uplink and downlink may be configured differently, but basically, transmission and reception in a single carrier are supported.
- the system of the present invention can operate a plurality of carriers through the carrier set as described above.
- the FDD system may also support asymmetric carrier aggregation in which the number of carriers and / or the bandwidth of the carriers are aggregated in uplink and downlink.
- a carrier set in which two or more component carriers are aggregated may be considered to support a wider transmission band, for example 100 MHz and spectrum aggregation.
- the terminal may receive or transmit one or a plurality of component carriers at the same time, depending on the capability.
- a terminal having reception and / or transmission capability for a carrier aggregation may simultaneously perform reception and / or transmission on multiple component carriers.
- the existing terminal may receive or transmit through a single component carrier.
- the user equipment can aggregate different number of component carriers of different bands in uplink and downlink.
- the number of component carriers and the band of each component carrier will be the same in uplink and downlink.
- MAC-PHY Media Access Control-Physical
- HARQ Hybrid Automatic Repeat reQuest
- ACK In the symmetric carrier set (when the number of aggregated uplink component carriers and the number of downlink component carriers are the same), the process of indexing the PUCCH resource is assumed to be compatible with the existing system, ACK, This can be simplified by extending the principles of existing systems (eg, LTE Rel-8) such as / NACK bundling, channel selection techniques, and ACK / NACK multiplexing using multiple sequence modulation.
- existing systems eg, LTE Rel-8
- ACK / NACK bundling is a technique used for efficiently feeding back a plurality of ACK / NACK information.
- the ACK / NACK bundling means processing and transmitting a plurality of ACK / NACK information using a logical AND operation or a logical OR operation.
- bundling using a logical AND operation means transmitting a NACK signal when any one of the plurality of ACK / NACKs is present, and transmitting an ACK only when the response of all signals is ACK as a result of decoding.
- bundling using a logical OR operation means transmitting an ACK signal when even one ACK among a plurality of ACK / NACKs exists, and transmitting a NACK only when a response of all signals is NACK as a result of decoding.
- the PDSCH is described on the assumption that it is transmitted on the downlink component carrier # 0, but cross-carrier scheduling is applied. It is apparent that the corresponding PDSCH can be transmitted through other downlink component carriers.
- the PDCCH is transmitted on the downlink component carrier # 0
- the corresponding PDSCH is transmitted on the downlink component carrier # 0.
- cross-carrier scheduling is applied. It is apparent that the corresponding PDSCH can be transmitted through other downlink component carriers.
- the control region is composed of logical CCE columns that are a plurality of CCEs.
- the CCE column is a collection of all CCEs constituting the control region in one subframe.
- the CCE corresponds to a plurality of resource element groups.
- the CCE may correspond to nine resource element groups.
- Resource element groups are used to define mapping control channels to resource elements.
- one resource element group may consist of four resource elements.
- a plurality of PDCCHs may be transmitted in the control region.
- the PDCCH carries control information such as scheduling assignment.
- the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
- CCEs control channel elements
- the format of the PDCCH and the number of bits of the PDCCH are determined according to the number of CCEs constituting the CCE group.
- the number of CCEs used for PDCCH transmission is called a CCE aggregation level.
- the CCE aggregation level is a CCE unit for searching for a PDCCH.
- the size of the CCE aggregation level is defined by the number of adjacent CCEs.
- the CCE aggregation level may be an element of ⁇ 1, 2, 4, 8 ⁇ .
- Table 1 below shows an example of the format of the PDCCH according to the CCE aggregation level, and the number of available PDCCH bits.
- the DCI includes uplink scheduling information, downlink scheduling information, system information, uplink power control command, control information for paging, and a random access response (RACH).
- Send control information for indicating is referred to as downlink control information (DCI).
- the DCI may transmit control information for indicating Semi-Persistent Scheduling (SPS) activation.
- SPS Semi-Persistent Scheduling
- the DCI may transmit control information for instructing the radial scheduling deactivation. Ring-less scheduling can be used for uplink or downlink Voice over Internet Protocol (VoIP) transmission.
- VoIP Voice over Internet Protocol
- the DCI format includes a format 0 for scheduling a physical uplink shared channel (PUSCH), a format 1 for scheduling one physical downlink shared channel (PDSCH) codeword, and a format 1A for compact scheduling of one PDSCH codeword.
- Format 1B for scheduling of rank-1 transmission of a single codeword in spatial multiplexing mode
- format 1C for very simple scheduling of downlink shared channel (DL-SCH)
- format 1D for scheduling PDSCH in multi-user spatial multiplexing mode
- Format 2 for PDSCH scheduling in closed-loop spatial multiplexing mode format 2A for PDSCH scheduling in open-loop spatial multiplexing mode
- TPC transmission power control
- FIG. 9 is a flowchart showing the configuration of a PDCCH.
- a base station generates control information according to a DCI format.
- the base station may select one DCI format among a plurality of DCI formats (DCI formats 1, 2, ..., N) according to control information to be sent to a user equipment (UE).
- a cyclic redundancy check for error detection is attached to control information generated according to each DCI format.
- an identifier referred to as a Radio Network Temporary Identifier (RNTI)
- RNTI Radio Network Temporary Identifier
- a unique identifier of the terminal for example, a C-RNTI (Cell-RNTI) may be masked to the CRC. That is, the CRC may be scrambled together with the unique identifier of the terminal.
- the RNTI for a specific terminal also includes a temporary C-RNTI, a semi-persistent C-RNTI, and the like.
- the temporary C-RNTI is a temporary identifier of the terminal and may be used during the random access procedure. Ringless C-RNTI may be used to indicate ring scheduling activation.
- a paging identifier for example, a P-RNTI (P-RNTI) may be masked to the CRC.
- a system information identifier for example, a System Information-RNTI (SI-RNTI) may be masked to the CRC.
- SI-RNTI System Information-RNTI
- RA-RNTI random access-RNTI
- the PDCCH carries control information for a specific UE. If any other RNTI is used, the PDCCH carries common control information received by all UEs in a cell. Carry
- coded data is generated by performing channel coding on the control information to which the CRC is added.
- rate matching is performed according to the CCE aggregation level allocated to the PDCCH format.
- step S740 the coded data is modulated to generate modulation symbols.
- the modulation symbols constituting one PDCCH may have one of 1, 2, 4, and 8 CCE aggregation levels.
- step S750 modulation symbols are mapped to physical resource elements RE (CCE to RE mapping).
- 10 is a flowchart showing PDCCH processing.
- step S810 the UE demaps a physical resource element to CCE.
- step S820 the UE demodulates each CCE aggregation level because it does not know which CCE aggregation level it should receive the PDCCH.
- step S830 the terminal performs rate dematching on the demodulated data. Since the UE does not know what DCI format control information should be received, the UE performs rate de-matching for each DCI format.
- operation S840 channel decoding is performed on the rate dematched data according to a code rate, and a CRC is checked to detect whether an error occurs. If no error occurs, the UE detects its own PDCCH.
- step S850 the UE having detected its own PDCCH removes the CRC from the decoded data to obtain control information necessary for the UE.
- a plurality of multiplexed PDCCHs for a plurality of UEs may be transmitted in a control region of one subframe.
- the terminal monitors the PDCCHs.
- monitoring means that the terminal attempts to decode each of the PDCCHs according to the monitored DCI format.
- the base station does not provide information on where the PDCCH corresponding to the UE is.
- the UE finds its own PDCCH by monitoring a set of PDCCH candidates in a subframe. This is called blind decoding.
- blind decoding Through blind decoding, the UE simultaneously performs identification of the PDCCH transmitted to the terminal and decoding of control information transmitted through the corresponding PDCCH. For example, if the CRC error is not detected by demasking its C-RNTI in the corresponding PDCCH, the UE detects it as its PDCCH.
- the number of DCI formats transmitted through the PDCCH is limitedly defined.
- the number of DCI formats is smaller than the type of heterogeneous control information transmitted using the PDCCH.
- the DCI format includes a plurality of different information fields. According to the DCI format, the types of information fields, the number of information fields, the number of bits of each information field, etc. constituting the DCI format vary. In addition, the size of control information matched to the DCI format varies according to the DCI format.
- PDCCH transmission is performed on various control information by using one DCI format among a limited number of DCI formats. That is, any DCI format may be used for transmitting two or more different kinds of control information.
- control information when the control information is embodied as a specific value of the information field of the DCI format, some information fields of the plurality of information fields may not be necessary. That is, a specific value may not be defined in some information fields of the plurality of information fields constituting the DCI format.
- Some information fields constituting the DCI format may be reserved fields and may be reserved with an arbitrary value. This is for size adaptation of a plurality of types of heterogeneous control information into one DCI format.
- the reserve field when the reserve field is present in the control information transmission as described above, the base station inefficiently consumes transmission energy and transmission power in order to transmit the corresponding reserve field that cannot be used for any function. Therefore, when generating control information in accordance with the DCI format, there is a need for a method capable of utilizing unused information fields among a plurality of information fields constituting the DCI format.
- FIG. 11 shows an example of a method that may utilize an unused information field among a plurality of information fields constituting a DCI format.
- control information A, B, and C which are different types of control information, are grouped to use one DCI format.
- Different kinds of control information A, B, and C (Control information A, B, C) are matched to one DCI format.
- the DCI format consists of a plurality of different information fields.
- Control information A is embodied by assigning a specific value to all information fields of a corresponding DCI format.
- Control information B or C is embodied by assigning a specific value to some information fields of a corresponding DCI format.
- the information bit size of control information A is largest in the group. This is because the control information A is a case in which all information fields of the corresponding DCI format are meaningfully configured.
- the information bit size of the control information A becomes the reference information bit size.
- the control information B or C adds null information to have the same size as the reference information bit size, respectively. Through this, the control information in the group is fixed to the same information bit size.
- a plurality of types of heterogeneous control information are grouped and matched to one arbitrarily designated DCI format.
- Individual control information is specified by mapping a specific value to an information field constituting a corresponding DCI format. Any control information in the group can be embodied by assigning a specific value to all information fields of the corresponding DCI format.
- other control information in the group may be embodied by assigning a specific value to some information fields of the corresponding DCI format. In other words, other information fields of the corresponding DCI format need not be used to embody the control information.
- the total size of the information fields used in the specification of the control information may be defined as the information bit size.
- the information bit size of the former control information is the largest, and the information bit size of the latter control information is relatively small.
- the information bit size when the control information is specified by giving a specific value to all information fields of the DCI format is referred to as the reference information bit size.
- the reference information bit size means the total size of information fields constituting the DCI format and / or the size of the DCI format itself. If other control information in the group has an information bit size smaller than the reference information bit size, null information is added to be equal to the reference information bit size.
- null information When specifying specific control information by specifying a value for some information fields among all information fields specified in the DCI format, the remaining information field whose value is not specified is used as null information. An information field used as null information may be referred to as an error check field.
- the null information is information added to be equal to the reference information bit size of the DCI format to which the control information is matched.
- some unused information fields may be used as null information.
- Null information has a specific value.
- an information field used as null information may be designated as a value of all '0' bits or all '1' bits.
- the field used as null information may be designated as a value of a binary code string known to the base station and the terminal in advance.
- the binary code string may be referred to as a binary scrambled code string.
- a binary bit string known to both the base station and the terminal, an m-sequence or gold generated by the base station and the terminal through the same input parameter may be used.
- the information field used as null information may be preset between the base station and the terminal, or the base station may inform the terminal of information about the information field used as null information.
- the base station can inform the terminal of information on an information field used as null information through RRC signaling or system information.
- null information can be used as a virtual CRC or probe for additional error checking.
- the resource scheduling method includes a dynamic scheduling method, a persistent scheduling method, a semi-persistent scheduling method, and the like.
- dynamic scheduling method scheduling information is required through a control signal whenever data is transmitted or received.
- continuous scheduling method scheduling information through a control signal is not required every time data is transmitted or received using preset information.
- semi-persistent scheduling interval the semi-persistent scheduling method does not require scheduling information through a control signal every time data is transmitted or received.
- the radial scheduling period may be initiated by receiving control information indicative of activation of the radial scheduling, and may expire by receiving control information indicative of deactivation of the radial scheduling.
- the radius scheduling period may be configured through RRC signaling.
- the base station 12 is a flowchart illustrating downlink data transmission using a dynamic scheduling method. Whenever the base station transmits downlink data through the PDSCH, the base station transmits a downlink grant (DL grant) every time through the PDCCH. The terminal receives the downlink data transmitted through the PDSCH using the downlink grant received through the PDCCH.
- the base station has an advantage that can be appropriately scheduled radio resources according to the downlink channel condition (channel condition).
- FIG. 13 is a flowchart illustrating uplink data transmission using a dynamic scheduling method.
- the radio station Before the UE transmits the uplink data through the PUSCH, the radio station is allocated a radio resource through an uplink grant (UL Grant).
- the uplink grant is transmitted on the PDCCH.
- VoIP Voice over IP
- IP Internet Protocol
- VoIP Voice over IP
- VoIP is a service for transmitting voice data through an Internet Protocol (IP)
- IP Internet Protocol
- CS Packet Switched
- PS Packet Switched
- VoIP connection-less voice data is transmitted without connection.
- RTP Real-time Transport Protocol
- RTP Control Protocol a protocol for controlling RTP
- RTP carries time stamp information in every packet to solve jitter problems, and by reporting the loss of RTP packets via RTCP, rate control provides a frame error rate (FER). Can be reduced.
- FER frame error rate
- SIP Session Initiation Protocol
- SDP Session Description Protocol
- FIG. 14 is an exemplary diagram illustrating a traffic model in VoIP.
- the types of voice packets generated in VoIP may be divided into packets generated in a talk spurt and packets generated in a silence period.
- the RTP packet is generated at a period of 20 ms in the conversation period and has a size of 35 to 49 bytes.
- the RTP packet is generated every 160ms and has a size of 10 to 24 bytes.
- VoIP In a voice service such as VoIP, when packets are generated at regular intervals, the size of the generated packets is relatively small and constant.
- VoIP generally employs a continuous scheduling scheme or a ring scheduling scheme.
- the radio bearer is predicted in advance in the radio bearer setup process to continuously allocate radio resources, and thus transmits or receives a packet without a control signal including scheduling information.
- the scheduling information since the scheduling information is not provided and a preset radio resource is used, the channel state at the time of transmitting or receiving the data is not taken into account, and thus the transmission error rate when the channel state changes. This can be high.
- VoIP is suitable to use the ring scheduling method with the conversation section as the ring scheduling period.
- the base station transmits control information instructing activation of the ring scheduling of the resource allocation information through the PDCCH.
- the UE may receive VoIP data through the PDSCH using resource allocation information from the base station.
- the base station transmits control information instructing activation of the ring scheduling of the resource allocation information through the PDCCH.
- the terminal may transmit the VoIP data through the PUSCH using the resource allocation information to the base station.
- Control information for scheduling PUSCH and control information for activating ring scheduling can be transmitted through DCI format 0.
- Ring-less scheduling activation can be used for uplink VoIP transmissions.
- Table 3 below shows an example of control information transmitted by DCI format 0.
- DCI format 0 includes a plurality of information fields.
- the information fields include (1) Flag field, (2) Hopping flag field, (3) Resource block assignment and hopping resource allocation field, (4) Modulation (MCS) and Coding Scheme and Redundancy version field, (5) New data indicator field, (6) TPC command field, (7) Cyclic shift field, ( 8) UL index field, and (9) CQI request field.
- MCS Modulation
- CQI request field CQI request field.
- the bit size of each information field is only an example, and does not limit the bit size of the field.
- the flag field is an information field for distinguishing between format 0 and format 1A.
- the resource block allocation and hopping resource allocation fields may have different bit sizes according to a hopping PUSCH or a non-hoppping PUSCH.
- Resource block allocation and hopping resource allocation fields for the non-hoping PUSCH Provides bits to the resource allocation of the first slot in the uplink subframe. here, Is the number of resource blocks included in the uplink slot and depends on the uplink transmission bandwidth set in the cell.
- Resource block allocation and hopping resource allocation fields for hopping PUSCH Provides bits to the resource allocation of the first slot in the uplink subframe.
- Control information of channel allocation for the PDSCH is expressed using all the fields described above. Accordingly, DCI format 1A for channel allocation for PDSCH becomes control information having a reference information size.
- Control information for scheduling of the PUSCH is expressed using all the fields described above. Accordingly, DCI format 0 for scheduling of PUSCH becomes control information having reference information bit size.
- an increase in the DCI format increases the number of blind decodings that the UE must perform, thereby increasing the complexity of the UE.
- a downlink grant and a downlink grant share the format of the uplink grant so as not to increase the complexity of the UE without increasing the complexity of the UE.
- a method of distinguishing a grant from an uplink grant and an apparatus for performing the same are provided.
- a method for transmitting an uplink or downlink grant (uplink) is uplink Or generating control information by determining a Downlink Control Information (DCI) format for a downlink grant; Attaching a cyclic redundancy check (CRC) for error detection to the generated control information; And channel coding the control information with the CRC attached thereto, wherein the control information includes a bit flag for distinguishing whether a grant is an uplink grant or a downlink grant.
- the bit flag is preferably 1 bit.
- DCI Downlink Control Information
- CRC cyclic redundancy check
- bit pattern for the uplink grant and the bit pattern for the downlink grant are set to have a maximum hamming distance (hamminig distance) from each other, and the bit pattern for the uplink grant and the downlink
- the bit pattern for the grant is characterized in that only one bit value is different from each other.
- the 1-bit value is preferably a Least Significant Bit (LSB).
- a PUCCH and a PHICH can be transmitted without a malfunction of the system.
- Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.
- 1 is a diagram illustrating a concept of managing downlink component carriers in a base station.
- FIG. 2 is a diagram illustrating a concept of managing uplink component carriers in a terminal.
- FIG. 1 is a diagram illustrating a concept in which one MAC manages multicarriers.
- FIG. 4 is a view illustrating a concept in which one MAC manages a multicarrier from a reception point of a terminal.
- FIG. 5 is a diagram for explaining a concept in which one or more MACs manage a multicarrier from a transmission point of a base station.
- FIG. 6 is a view for explaining a concept in which one or more MACs manage a multicarrier from a reception point of a terminal.
- FIG. 7 is a diagram illustrating a concept in which one or more MACs manage a multicarrier from a transmission point of a base station.
- FIG. 8 is a view illustrating a concept in which one or more MACs manage a multicarrier from a reception point of a terminal.
- FIG. 9 is a flowchart showing the configuration of a PDCCH.
- 10 is a flowchart showing PDCCH processing.
- FIG. 11 shows an example of a method that may utilize an unused information field among a plurality of information fields constituting a DCI format.
- FIG. 12 is a flowchart illustrating downlink data transmission using a dynamic scheduling method.
- FIG. 13 is a flowchart illustrating uplink data transmission using a dynamic scheduling method.
- FIG. 14 is an exemplary diagram illustrating a traffic model in VoIP.
- 15 is a flowchart illustrating downlink data transmission using a radial scheduling.
- 16 is a flowchart illustrating uplink data transmission using a radial scheduling method.
- 17 is a diagram illustrating a procedure for uplink or downlink grant transmission according to an embodiment of the present invention.
- FIG. 18 is a block diagram showing a configuration of a device applicable to a base station and a user equipment and capable of carrying out the present invention.
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of the Institute of Electrical and Electronics Engineers (IEEE) 802.11m, 3GPP system, 3GPP LTE system, and 3GPP2 system, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
- IEEE Institute of Electrical and Electronics Engineers
- the base station may transmit the PDCCH by performing the following procedure for downlink / uplink grant transmission.
- the UE may detect and perform blind decoding on the location of the grant and the CCE aggregation level, and detect the downlink / uplink grant in the reverse order.
- FIG. 17 is a diagram illustrating a procedure for uplink or downlink grant transmission according to an embodiment of the present invention.
- a DCI format for downlink or uplink grant is determined (S151).
- a bit field corresponding to a downlink or uplink grant is generated.
- sizes of the downlink grant and the uplink grant may be sized.
- the size of both grants may be matched by adding a padding bit to information having a smaller size among the downlink grant and the uplink grant.
- the CRC is attached to the generated signal (S153).
- channel coding is performed (S154).
- a tail-biting convolutional coding scheme may be used.
- rate matching S155
- modulation S156
- CCE aggregation level determination a kind of link adaptation for PDCCH
- RE Resource Element mapping
- a position between the S151 and S152 (hereinafter referred to as A position), between the steps S152 and S153 (hereinafter referred to as position B), between the steps S153 and S154 (hereinafter referred to as position C) ), A method for distinguishing a downlink / uplink grant may be applied to one of the steps S154 and S155 (hereinafter, referred to as a D position).
- This embodiment will propose a method of adding a bit flag for a downlink / uplink grant.
- One bit may be added in the DCI bit field, or one bit may be set in a null bit position for distinguishing downlink and uplink grants.
- the UE may distinguish whether the corresponding DCI is for downlink or uplink through the bit flag after PDCCH decoding. Alternatively, some of the existing bit fields may be used for downlink / uplink grants.
- This embodiment proposes a method of bit level scrambling on a bit field.
- cell-specific scrambling is performed on the encoded bits of the PDCCH to randomize inter-cell interference.
- the scrambled code may be generated by seeding each physical cell ID (PCI) through pseudo random generation based on a gold code.
- the scrambling code generated for each PCI is performed at an encoded bit level to achieve randomization between cells.
- the present invention proposes to perform scrambling by generating the downlink grant specific or the uplink grant specific scrambling code.
- scrambling may be performed at the bit level or the modulation symbol level, but for convenience, the bit level scrambling will be described herein as an example.
- the base station transmission procedure it may be applied at any one of B, C, and D.
- a downlink / uplink grant parameter other than PCI may be added to the generated seed value.
- the seed value of the scrambling code is generated as shown in Equation 1 based on the PCI and the slot number.
- n grant corresponds to a seed for a grant .
- a specific bit pattern may be masked to the CRC in order to distinguish whether the grant is for downlink or uplink.
- a predetermined bit pattern masking the CRC may be defined by dividing downlink and uplink, or may be defined by using DL-RNTI or UL-RNTI.
- C-RNTI exists separately and masks CRC, and additionally masks DL-RNTI and UL-RNTI to distinguish downlink grant and uplink grant.
- DL-RNTI / UL-RNTI is designated in advance and applied in the same manner regardless of cell / user, and broadcasting DL-RNTI / UL-RNTI (cell-specific RRC (Radio Resource Control) or user device specific RRC). There is a method of signaling and using.
- masking the DL-RNTI / UL-RNTI may be applied to the C position.
- One embodiment described below is a method of designating and using DL / UL-RNTI in advance, and may be performed in addition to the masking C-RNTI in advance.
- two bit patterns may have the largest hamming distance from each other. For example, if the DL-RNTI masked to the CRC is ⁇ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ⁇ , UL- The RNTI is ⁇ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 ⁇ days generated through the complement operation of the DL-RNTI. Can be.
- the UL-RNTI is ⁇ 1,1 , 0,1,1,1,1,0,0,1,1,0,1,1,1 ⁇ .
- a fatal error may occur in a system operation. Accordingly, when UL-RNTI and DL-RNTI are configured as described above, an error in recognizing a downlink grant as an uplink grant or an error in misidentifying an uplink grant as a downlink grant can be minimized.
- the second example of setting a predetermined DL-RNTI and UL-RNTI in advance may differently set only one bit value of two bit patterns. For example, the value of the Least Significant Bit (LSB) may be set differently.
- the DL-RNTI masked to the CRC is ⁇ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ⁇
- the UL-RNTI is DL- It may be ⁇ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 ⁇ generated through complementary operation of the RNTI.
- An advantage of the case described above is that when the UE performs CRC check, the downlink grant and the uplink grant are distinguished by the LSB value, and 15 bits can be identified through the C-RNTI. By doing so, the error identifying the ID of the terminal can be increased to the minimum value from 2 ⁇ -16 to 2 ⁇ -15. In addition, it becomes easy to set a C-RNTI having a difference of 1 when the base station schedules the C-RNTI.
- information A is used to distinguish the existing specific mode, ⁇ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ⁇
- information B For example, assume that ⁇ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 ⁇ is masked on the CRC.
- DL-RNTI is ⁇ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0 ⁇
- UL-RNTI can be ⁇ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0 ⁇ .
- DL / UL-RNTI can be effectively set, avoiding collision with masking information used in the past.
- the device 100 includes a processing unit 101, a memory unit 102, a radio frequency (RF) unit 103, a display unit 104, and a user interface unit 105. do.
- the layer of physical interface protocol is performed in the processing unit 101.
- the processing unit 101 provides a control plane and a user plane. The function of each layer may be performed in the processing unit 101.
- the processing unit 101 may perform the embodiments of the present invention described above.
- the processing unit 101 may perform a function of generating a user equipment location determination subframe or receiving the subframe to determine the location of the user device.
- the memory unit 102 is electrically connected to the processing unit 101 and stores an operating system, an application, and a general file. If the device 100 is a user device, the display unit 104 may display a variety of information, and may be implemented by using a known liquid crystal display (LCD), an organic light emitting diode (OLED), or the like.
- the user interface unit 105 can be configured in combination with known user interfaces such as keypads, touch screens, and the like.
- the RF unit 103 is electrically connected to the processing unit 101 and transmits or receives a radio signal.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- a user equipment may be replaced with terms such as a mobile station (MS), a subscriber station (SS), a mobile subscriber station (MSS), or a mobile terminal.
- MS mobile station
- SS subscriber station
- MSS mobile subscriber station
- mobile terminal a mobile terminal
- the UE of the present invention includes a PDA (Personal Digital Assistant), a cellular phone, a Personal Communication Service (PCS) phone, a Global System for Mobile (GSM) phone, a Wideband CDMA (WCDMA) phone, a Mobile Broadband System (MBS) phone, and the like. Can be used.
- PDA Personal Digital Assistant
- GSM Global System for Mobile
- WCDMA Wideband CDMA
- MBS Mobile Broadband System
- Embodiments of the invention may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
- the method according to embodiments of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs). Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs Field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- the method according to the embodiments of the present invention may be implemented in the form of a module, procedure, or function that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- the present invention can be used in a terminal, base station, or other equipment of a wireless mobile communication system.
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- Computer Networks & Wireless Communication (AREA)
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- Computer Security & Cryptography (AREA)
- Radio Transmission System (AREA)
Abstract
Description
PDCCH format | CCE 집합 레벨 | 자원 요소 그룹의 개수 | PDCCH 비트 수 |
0 | 1 | 9 | 72 |
1 | 2 | 18 | 144 |
2 | 4 | 36 | 288 |
3 | 8 | 72 | 576 |
Type | Identifier | Description |
UE-specific | C-RNTI, temporary C-RNTI, semi-persistent C-RNTI | used for a unique UE identification |
Common | P-RNTI | used for paging message |
SI-RNTI | used for system information | |
RA-RNTI | used for random access response |
Information Field | bit(s) | |
(1) | Flag for format0/format1A differentiation | 1 |
(2) | Hopping flag | 1 |
(3) | Resource block assignment and hopping resource Allocation | |
(4) | Modulation and coding scheme and redundancy Version | 5 |
(5) | New data indicator | 1 |
(6) | TPC command for scheduled PUSCH | 2 |
(7) | Cyclic shift for DM RS | 3 |
(8) | UL index (TDD) | 2 |
(9) | CQI request | 1 |
Claims (6)
- 상향링크 및 하향링크 MIMO(Multiple Input Multiple Output)을 지원하는 무선 통신 시스템에 있어서, 상향링크 또는 하향링크 그랜트(grant)를 전송하는 방법은,상향링크 또는 하향링크 그랜트를 위한 DCI(Downlink Control Information) 포맷을 결정하여 제어정보를 생성하는 단계;상기 생성된 제어정보에 에러 검출(error detection)을 위한 CRC(Cyclic Redundancy Check)를 부착하는 단계;상기 CRC가 부착된 제어정보를 채널 코딩하는 단계를 포함하고,상기 제어정보는 그랜트가 상향링크 그랜트인지 하향링크 그랜트인지 구분하는 비트 플래그를 포함하는,그랜트 전송 방법.
- 제1항에 있어서,상기 비트 플래그는 1비트인,그랜트 전송 방법.
- 상향링크 및 하향링크 MIMO(Multiple Input Multiple Output)을 지원하는 무선 통신 시스템에 있어서, 상향링크 또는 하향링크 그랜트(grant)를 전송하는 방법은,상향링크 또는 하향링크 그랜트를 위한 DCI(Downlink Control Information)포맷을 결정하여 제어정보를 생성하는 단계;상기 생성된 제어정보에 에러 검출(error detection)을 위한 CRC(Cyclic Redundancy Check)를 부착하는 단계;상기 CRC에 상향링크 그랜트와 하향링크 그랜트를 구별하기 위한 비트 패턴(bit pattern)을 마스킹(masking)하는 단계와;상기 제어정보를 채널 코딩하는 단계를 포함하는,그랜트 전송 방법.
- 제3항에 있어서,상기 상향링크 그랜트를 위한 비트 패턴과 상기 하향링크 그랜트를 위한 비트 패턴은 서로 해밍 거리(hamminig distance)가 최대가 되도록 설정되는,그랜트 전송 방법.
- 제3항에 있어서,상기 상향링크 그랜트를 위한 비트 패턴과 상기 하향링크 그랜트를 위한 비트 패턴은 1비트 값만 서로 상이한,그랜트 전송 방법.
- 제5항에 있어서,상기 1비트 값은 LSB(Least Significant Bit)인,그랜트 전송 방법.
Priority Applications (1)
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US13/510,538 US8861462B2 (en) | 2009-12-16 | 2010-12-16 | Method and apparatus for transmitting an uplink or downlink grant in a wireless communication system that supports uplink and downlink MIMO schemes |
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US28717809P | 2009-12-16 | 2009-12-16 | |
US61/287,178 | 2009-12-16 | ||
KR1020100067857A KR101740434B1 (ko) | 2009-12-16 | 2010-07-14 | 상향링크 및 하향링크 mimo를 지원하는 무선 통신 시스템에 있어서, 상향링크 또는 하향링크 그랜트를 전송하는 방법 및 장치 |
KR10-2010-0067857 | 2010-07-14 |
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US8503338B2 (en) * | 2010-06-28 | 2013-08-06 | Telefonaktiebolaget Lm Ericsson (Publ) | Optimized signaling of demodulation reference signal patterns |
WO2013032202A2 (ko) * | 2011-08-26 | 2013-03-07 | 엘지전자 주식회사 | 하향링크 신호 수신 방법 및 사용자기기와, 하향링크 신호 전송 방법 및 기지국 |
CN104040920B (zh) * | 2011-11-08 | 2017-04-05 | Lg电子株式会社 | 用于接收数据的方法和无线装置 |
WO2013095041A1 (ko) * | 2011-12-23 | 2013-06-27 | 엘지전자 주식회사 | 무선 통신 시스템에서 무선 자원 동적 변경에 기반한 신호 송수신 방법 및 이를 위한 장치 |
WO2018174577A1 (ko) * | 2017-03-22 | 2018-09-27 | 엘지전자 주식회사 | 랜덤 접속 과정을 수행하는 방법 및 이를 위한 장치 |
CN111148263B (zh) * | 2017-05-05 | 2021-04-09 | 华为技术有限公司 | 发送数据的方法及其装置 |
US10841862B2 (en) | 2017-05-26 | 2020-11-17 | Qualcomm Incorporated | Millimeter wave directional discovery signal design |
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US8144712B2 (en) | 2008-08-07 | 2012-03-27 | Motorola Mobility, Inc. | Scheduling grant information signaling in wireless communication system |
US8379581B2 (en) | 2008-12-08 | 2013-02-19 | Sharp Kabushiki Kaisha | Systems and methods for uplink power control |
US8260356B2 (en) * | 2009-06-18 | 2012-09-04 | Samsung Electronics Co., Ltd. | Method and system for indicating method used to scramble dedicated reference signals |
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US20120230291A1 (en) | 2012-09-13 |
US8861462B2 (en) | 2014-10-14 |
WO2011074887A3 (ko) | 2011-11-03 |
KR20110068807A (ko) | 2011-06-22 |
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