WO2014157927A1 - 복수의 서빙 셀에서 상향 링크 제어 정보의 전송을 제어하는 방법 및 그 장치 - Google Patents
복수의 서빙 셀에서 상향 링크 제어 정보의 전송을 제어하는 방법 및 그 장치 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
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- the present invention relates to a method and apparatus for transmitting uplink control information of a plurality of serving cells for supporting carrier aggregation technology between base stations.
- LTE Long Term Evolution
- LTE-Advanced of the current 3GPP series are high-speed, high-capacity communication systems that can transmit and receive various data such as video and wireless data, beyond voice-oriented services.
- the development of technology capable of transferring large amounts of data is required.
- As a method for transmitting a large amount of data data can be efficiently transmitted using a plurality of cells.
- uplink transmission is performed in a plurality of cells or small cells, and a technique for controlling transmission of a channel of uplink control information is required.
- the present invention to solve the above problems In the transmission of uplink control information, a technique and a method for controlling the transmission of each serving cell are proposed.
- the method for controlling the transmission of uplink control information in a plurality of serving cells by the terminal compares the number of simultaneous transmission K and the number of UCI simultaneous transmission M, Selecting M of the UCIs to be transmitted simultaneously when the comparison result K is greater than M, and transmitting the selected M UCIs to a base station through a physical uplink control channel (PUCCH) of each serving cell, M is less than or equal to the number N of serving cells and is a natural number of 1 or more.
- PUCCH physical uplink control channel
- a UCI of M or less which is the number of UCI simultaneous transmissions, can be received from a terminal through a physical uplink control channel (PUCCH) of each serving cell. And confirming the UCI, wherein the number of UCIs to be transmitted simultaneously by the UE is greater than M, wherein at least one UCI smaller than K is transmitted through the PUCCH. It is characterized by being a natural number less than or equal to the number N of serving cells and one or more.
- a terminal compares a receiving unit for receiving a signal from a base station, the number of UCIs to be transmitted simultaneously and M, which is the number of simultaneous UCI transmissions, and when the comparison result is greater than M, among the simultaneous transmissions of UCIs.
- PUCCH physical uplink control channel
- a base station is a transmitting unit for transmitting a signal to the terminal, a receiving unit for receiving a UCI or less of the number of UCI simultaneous transmission from the terminal via PUCCH (Physical Uplink Control CHannel) of each serving cell, and the And a control unit for identifying a UCI, wherein when the number of UCIs simultaneously transmitted by the UE is greater than the M, one or more UCIs smaller than K are transmitted through the PUCCH, and M is the number N of serving cells.
- each serving cell is controlled to be transmitted independently.
- FIG 1 illustrates an example network configuration scenario for the present invention.
- FIG. 2 shows another example of a network configuration scenario for the present invention.
- FIG. 3 is a diagram illustrating a part of a configuration of a higher layer RRC signaling message according to an embodiment of the present invention.
- 4 is a diagram illustrating a MAC CE according to an embodiment of the present invention. 4 shows a configuration of a MAC header and a MAC CE.
- FIG. 5 is a diagram illustrating a process of controlling transmission of uplink control information in a plurality of serving cells in a terminal according to an embodiment of the present invention.
- FIG. 6 is a diagram illustrating a process of a base station controlling transmission of uplink control information in a plurality of serving cells according to an embodiment of the present invention.
- FIG. 7 is a diagram illustrating a configuration of a user terminal according to another embodiment.
- FIG. 8 is a diagram illustrating a configuration of a base station according to another embodiment.
- the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
- the wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB).
- a user terminal is a comprehensive concept of a terminal in wireless communication.
- UE user equipment
- LTE Long Term Evolution
- HSPA High Speed Packet Access
- MS Mobile Station
- UT User Terminal
- SS Global System for Mobile communications
- a base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS.
- Base Transceiver System Access Point, Relay Node, Remote Radio Head, RRH, Radio Unit, Transmission Point, TP, Reception Point, RP, etc. It may be called in other terms.
- a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU communication range.
- BSC base station controller
- the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station.
- the eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, etc. become embodiments of the base station according to the configuration of the radio region.
- the base station may indicate the radio area itself to receive or transmit a signal from the viewpoint of the user terminal or the position of a neighboring base station.
- megacells macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.
- the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
- the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
- the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
- the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
- CDMA Code Division Multiple Access
- TDMA Time Division Multiple Access
- FDMA Frequency Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- OFDM-FDMA OFDM-TDMA
- OFDM-CDMA OFDM-CDMA
- One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
- the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
- the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
- TDD time division duplex
- FDD frequency division duplex
- Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH).
- a data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.
- control information can also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).
- a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
- a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
- antenna transmission system a cooperative multi-cell communication system.
- the CoMP system may include at least two multiple transmission / reception points and terminals.
- the multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
- an eNB a base station or a macro cell
- a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
- downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
- uplink refers to a communication or communication path from a terminal to multiple transmission / reception points.
- a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
- a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
- a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.
- transmitting or receiving a PDCCH or transmitting or receiving a signal through a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.
- the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.
- the PDCCH which is an embodiment of the present invention, may be applied to the portion described as the PDCCH.
- high layer signaling described in the present specification includes RRC signaling for transmitting RRC information including an RRC parameter.
- An eNB which is an embodiment of a base station, performs downlink transmission to terminals.
- the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH.
- a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
- PUSCH physical uplink shared channel
- the first terminal UE1 may transmit an uplink signal to the eNB and the second terminal may transmit an uplink signal to the RRH.
- carrier aggregation Prior to 3GPP LTE / LTE-Advanced Rel-11, carrier aggregation (or carrier aggregation, or 'CA') technology is one or more CC (Component Carrier, or element) configured by the base station to form a cell for any terminal Or a combination of CCs of small cells constructed using a low power remote radio head (RRH), which is a geographically dispersed antenna within the coverage of the macro cell and the macro cell CC, to increase the data rate.
- CC Component Carrier, or element
- the macro cell and the RRH cell are constructed to be scheduled under the control of one eNB for carrier aggregation technology, and for this purpose, an ideal backhaul was required between the macro cell node and the RRH.
- An ideal backhaul means a backhaul that exhibits very high throughput and very low latency, such as a dedicated point-to-point connection using optical fiber, line of sight (LOS) microware.
- backhaul that exhibits relatively low throughput and large delay, such as digital subscriber line (xDSL) and non-LOS microwave is called non-ideal backhaul.
- the CCs operating based on independent center frequencies are referred to as one cell, which is constructed by a network operator such as one base station / eNB / RRH. It has a different meaning from the concept of geographic / physical cell formed through one transmitting node. In the present invention, the cell concept is distinguished by context.
- a CC corresponding to a serving cell to which the terminal enters when the terminal enters an initial network entry / re-entry is a primary cell.
- Information related to secondary cells, which can be additionally merged according to the capability of the UE through the corresponding primary cell, is set by RRC signaling, and a MAC CE (Control Element) message is subsequently added.
- the carrier merging technique is applied to a structure in which a cell to be merged by a corresponding UE among secondary cells configured through the RRC signaling is activated or deactivated.
- carrier aggregation when carrier aggregation is applied to any UE in a 3GPP LTE / LTE-Advanced Rel-11 or lower system, even if cells have independent center frequencies, carrier aggregation based on a single scheduling unit is applied.
- PUCCH resources for uplink control information (UCI) transmission of the UE to which the carrier aggregation is applied are configured only through the primary cell among the merged serving cells. Accordingly, when a carrier aggregation applied UE transmits UCI, the UE transmits through the PUCCH resources of the primary cell or the primary according to configuration information about PUCCH / PUSCH simultaneous (PUCCH / PUSCH simultaneous).
- a PUSCH transmission resource of a cell or a PUSCH transmission resource of a secondary cell is transmitted.
- any terminal 130 located in an area where respective cells formed by two or more different base stations may be variously referred to 110 and 120 overlap each other.
- the carriers between the base stations used for data transmission and reception may be merged by merging the frequency bands supported by the base stations 110 and 120.
- a cell type formed by each of the base stations 110 and 120 may be a macro cell, a small cell (eg, a pico cell, a micro cell, etc.) or a femtocell according to its coverage. femto cell) and the like.
- carriers between small cells formed by overlapping with macro cells may be merged.
- FIG. 2 shows another example of a network configuration scenario for the present invention.
- Small cells formed by low power base stations that use lower transmit (Tx) power than conventional macro base stations cover cells of smaller size than macro cells, thus increasing spatial spatial recyclability compared to macro cell based network structures.
- Tx transmit
- the introduction of small cells intensifies the inter-cell interference problem, and in particular, in a heterogeneous network scenario in which macro and small cells overlap with each other using the same frequency band, the macro cell and the small cell are small. Inter-cell interference can cause severe performance degradation.
- each of the terminals 230 belonging to the small cell coverage may respectively use the macro cell through the frequency band F1 of the macro cell.
- Supporting inter-eNB Carrier Aggregation which is also connected to the small cell base station 220 through the small cell frequency band (F2) in the state of establishing a connection with the base station 210. Plans are being discussed.
- inter-eNBs based on the existing carrier merging operation scheme are inter -eNB
- Carrier merge technology becomes difficult to apply.
- the UE merges the small cell carrier F2 into the secondary cell while the UE is holding the macro cell carrier F1 as the primary cell
- the UCI is transmitted to the primary cell as in the past.
- HARQ operation and radio channel based scheduling become difficult to apply.
- the present invention supports dual connectivity with neighboring base stations in an arbitrary terminal located in a region where coverage between neighboring base stations (eNB / RRH / RU) overlaps in a 3GPP-based wireless mobile communication system. Suggest ways to do this.
- the terminal and the base station for supporting the inter-eNB Carrier Aggregation technology that uses the frequency bands supported by the neighboring base stations in the terminal It relates to the operation method of.
- the present invention proposes a UCI transmission scheme of a terminal for applying a carrier aggregation technique between base stations under a non-ideal backhaul based on a rather long backhaul delay time between base stations as shown in FIG. 1.
- the present invention focuses on a UCI transmission scheme for a carrier merge terminal for additionally merging F2, which is a small cell carrier, in a carrier merge scenario between the macro cell and the small cell as shown in FIG. 2.
- F2 is a small cell carrier
- a PUCCH resource that is an uplink control channel in case of a terminal using a plurality of carriers, that is, a terminal in which a plurality of serving cells are configured, is used. Is allocated only in a primary cell among serving cells configured for the corresponding UE.
- the term "cell” herein means one component carrier, and in the present invention, the cell and the component carrier (CC) are used together. That is, when the uplink control information is transmitted, the UE transmits the data through the PUSCH which is the uplink data channel of the primary cell or the secondary cell or through the PUCCH of the primary cell.
- a new proposal for a method of transmitting uplink control information of an applicable terminal is proposed.
- more diverse carrier aggregation scenarios are considered in Rel-12 and subsequent systems.
- a base station or inter-eNB, inter-eNB in which a terminal located in a coverage overlap area of a neighboring base station establishes a connection with corresponding neighboring base stations through different carriers, respectively.
- the Rel-12 system or a subsequent system may be configured to transmit uplink control information independently for each serving cell.
- each serving may be performed according to a base station / eNB constituting a corresponding serving cell for a plurality of serving cells merged in an arbitrary terminal (classifying a master eNB and a secondary eNB according to whether or not an RRC connection is established).
- one cell may be selected for each serving cell group, and uplink control information may be transmitted for each serving cell group through the uplink of the selected cell.
- uplink control information may be transmitted for each serving cell group through the uplink of the selected cell.
- An indicator regarding a UCI transmission method for setting whether or not to be defined may be defined and may be transmitted to a corresponding UE through MAC CE signaling or UE-specific RRC signaling when the carrier is merged.
- Rel-12 or subsequent UEs can be defined to transmit UCI independently for each serving cell, or when adding or activating a secondary cell, whether to allocate PUCCH resources for the secondary cell in a corresponding carrier merging situation.
- UCI transmission scheme can be defined.
- the UCI transmission scheme for each serving cell for the Rel-12 UE may be configured differently from the UCI transmission scheme in the existing Rel-11 carrier aggregation.
- the UCI transmission method in Rel-12 carrier aggregation is newly defined, but the above-described method of setting Rel-12 UCI transmission for each terminal is not limited.
- the present invention looks at the UCI transmission scheme of the terminal when it is necessary to simultaneously transmit the UCI over a plurality of serving cell uplink for the terminal configured to comply with the new UCI transmission scheme for Rel-12.
- the UCI of a serving cell having an upper (or lower) lower carrier indicator field (CIF ) is dropped.
- Component Carrier having an upper (or lower) lower carrier indicator field (CIF )
- UCI for any two or more serving cells among the corresponding serving cells is simultaneously generated for any UE that merges and uses N serving cells, thereby serving each serving cell through the same uplink subframe. If UCI needs to be transmitted, the UCI of the serving cell having the lowest CIF value may be transmitted, and the UCI transmission for the remaining serving cells may be defined to drop.
- the UE independently transmits uplink control information (UCI) for each serving cell. For example, when a base station activates CC # 2 as a secondary cell for any UE operating by holding CC # 1 as the primary cell, PUCCH resource allocation information for the corresponding CC # 2 is common for the UE. When configured by RRC signaling and dedicated RRC signaling, the UE independently transmits uplink control information (UCI) for each serving cell.
- UCI uplink control information
- UCI such as HARQ ACK / NACK feedback for downlink data transmission of primary cell or CQI feedback and scheduling request (SR) for primary cell may be performed through PUCCH resource or PUSCH of uplink subframe of primary cell.
- the UCI for the secondary cell is transmitted through the PUCCH resource or the PUSCH of the secondary cell.
- the corresponding terminal does not support simultaneous transmission of uplink through different CCs or serving cells, the corresponding UE has a low CIF.
- the UCI of the primary cell which is the serving cell, is transmitted first, and the UCI of the remaining secondary cells is dropped.
- the UCI of the primary cell of the high CIF serving cell may be preferentially transmitted, and the UCI of the remaining secondary cells except for this may be dropped.
- the secondary cell is configured to have a CIF value in ascending order
- the UE is the smallest CIF among the CIFs of the serving cell. Only the UCI of the serving cell having the value is transmitted through the PUCCH or the PUSCH of the corresponding serving cell and the remaining UCI is dropped. Further extending the first embodiment, it is possible to drop the UCI of the secondary cell rather than the primary cell.
- the first embodiment may be extended.
- the CIF may be defined to select M from small serving cells to transmit UCI.
- each serving cell is grouped according to the base station / eNB constituting the serving cell with respect to the serving cells merged in an arbitrary terminal, and one serving cell is selected for each serving cell group, and then each serving cell group is upward.
- the link control information is defined to be transmitted separately, the CIF-based uplink control information transmission serving cell selection scheme may be applied. That is, the priority of uplink control information transmission may be defined according to the CIF value of the serving cells selected to transmit uplink control information for each serving cell group.
- CC # 1, CC # 2 Is a serving cell configured by the first base station / eNB
- CC # 3 CC # 4
- CC # 5 is a serving cell configured by the second base station / eNB having a separate scheduler from the first base station / eNB
- CC # 1, CC # 2) is configured as one first serving cell group
- the corresponding (CC # 3, CC # 4, CC # 5) is configured as another second serving cell group
- the uplink control information for the 1 serving cell group is transmitted through an uplink subframe of CC # 1
- the uplink control information for the second serving cell group is transmitted through an uplink subframe of CC # 3.
- the uplink control information transmission for the first serving cell group and the uplink control information transmission for the second serving cell group occur simultaneously in the corresponding CC # 1 and CC # 3, and the corresponding terminal simultaneously transmits the uplink.
- the transmission is not supported, only uplink control information of a serving cell group having a small (or large) CIF value according to the CIF values of CC # 1 and CC # 3 may be defined to be transmitted at a corresponding moment.
- priority for uplink control information transmission may be defined in the serving cell group itself.
- Priority of each of the first serving cell group and the second serving cell group may be determined by the second base station / eNB.
- a serving cell group configured by a base station / eNB to which a corresponding carrier aggregation terminal has an RRC connection is referred to as a master cell group
- a serving cell group configured by another base station / eNB is referred to as a secondary cell group.
- the group may be defined and may be defined to have priority over the uplink control information transmission for the serving cells constituting the secondary cell group with respect to the transmission of the uplink control information for the serving cells constituting the master cell group.
- Priority ( U) of each UCI type that is commonly applied to serving cells configured as the second embodiment is defined.
- the priority of each UCI may be defined, and the highest priority UCI may be transmitted through the corresponding serving cell. That is, when a carrier aggregation terminal needs to transmit an uplink subframe of each serving cell to UCI for a plurality of serving cells at the same time, a serving cell to transmit UCI may be selected according to the type of UCI for each serving cell. have. As an example of priority setting according to the UCI type, the priority of HARQ ACK / NACK feedback for downlink data transmission may be set highest, followed by SR and CQI / CSI feedback. As such, when the priority for each UCI is set, the highest priority UCI is transmitted through the PUCCH or the PUSCH of the corresponding serving cell, and the remaining UCI is dropped.
- the UCI having the highest priority occurs in the plurality of serving cells, it is possible to determine whether to transmit the corresponding high priority according to the scheme described in the first embodiment.
- the number of uplink simultaneous transmissions supported by the terminal is M, and the M is less than the number of simultaneous UCI transmissions occurring in the terminal at any moment, K, the corresponding K serving cells are transmitted.
- M UCIs having a high priority may be selected and defined to be transmitted in corresponding M serving cells.
- a simultaneous UCI transmission indicator for each secondary serving cell is defined.
- Simultaneous UCI Tx indicator may be defined according to the capability of the terminal and the uplink channel environment of the terminal.
- the simultaneous UCI transmission indicator is a parameter set for each secondary serving cell when each (secondary) serving cell (CC) is activated.
- the CIF of the secondary cell is lower than the CIF value of the primary cell or the secondary cell.
- This parameter configures whether the secondary cell having the value can be performed simultaneously with the transmission of the UCI. That is, when activating any secondary cell, it may be defined to transmit a simultaneous UCI transmission indicator together with PUCCH resource allocation information in the secondary cell.
- the UE When the simultaneous UCI transmission indicator is configured, the UE simultaneously sets UCI of the secondary cell through UCI transmission of a secondary cell having a UCI of a primary cell or a lower CIF value and PUCCH or PUSCH of a secondary cell uplink subframe. Can transmit If the secondary serving cell for which the corresponding simultaneous UCI transmission indicator is not set, the secondary serving cell when UCI transmission occurs in a secondary cell having a lower primary cell or a lower CIF value according to the first embodiment described above Drops UCI transmissions from. Alternatively, according to the second embodiment, the UCI should be transmitted only when the priority of the UCI to be transmitted in the primary cell or the secondary cell having a lower CIF value is lower than the priority of the UCI to be transmitted in the secondary serving cell. If not, you can drop it.
- the number of simultaneous UCI Tx configuration is set.
- an additional " number of simultaneous UCI Tx" can be additionally set and transmitted to the UE.
- the information is an information area indicating the number of serving cells that can simultaneously transmit UCI in the UE, and the UE can simultaneously transmit UCI in the serving cells corresponding to the set number. That is, if the corresponding simultaneous UCI transmission count information area is set to M (any natural number less than or equal to N) for a UE that merges and uses any N CCs, the UE may simultaneously transmit UCI in up to M serving cells. Can be.
- M serving cells for transmitting UCI may be selected by Method 1 or Method 2 above.
- an arbitrary terminal merges five serving cells (CCs) and uses an information area of the corresponding simultaneous UCI transmission number of 2, the corresponding UE uses UCI through uplink subframes of up to two serving cells. Can be transmitted simultaneously.
- CCs serving cells
- the corresponding UE uses UCI through uplink subframes of up to two serving cells. Can be transmitted simultaneously.
- three or more serving cells need to transmit UCI at the same time UCI is transmitted through two serving cells having a small CIF value according to the scheme 1, and the UCI of the other serving cell is dropped, or according to the scheme 2
- Two serving cells to transmit UCI may be selected according to the priority of UCI to be transmitted in each serving cell.
- the UCI dropping rule described in the above four embodiments is applied only when transmitted through the PUCCH, and UCI transmission through the PUSCH can always be allowed. That is, in the above example, when it is necessary to simultaneously transmit UCI in a plurality of serving cells, the UCI dropping rule is not applied to the serving cell capable of UCI transmission through the PUSCH, and the UCI for the serving cell is transmitted through the PUSCH. Can transmit That is, when simultaneous PUSCH / PUCCH transmission is not configured in a serving cell to which a PUSCH resource is allocated, the corresponding UE does not apply the UCI dropping rule and piggybacks the corresponding PUSCH to transmit the UCI.
- the dropping rule may be applied only to serving cells that need to transmit UCI over PUCCH (that is, when PUSCH resources are not allocated or simultaneous PUSCH / PUCCH transmission is configured).
- secondary cells may be forced not to allow simultaneous PUSCH / PUCCH transmission. That is, when the PUSCH resource is allocated to the secondary cells, it may be defined to always piggyback on the PUSCH and transmit the secondary cell.
- the parameter is defined as a newly defined MAC CE signaling.
- an information area may be defined for transmission to a corresponding UE through UE-specific RRC signaling or for transmitting a corresponding parameter to existing MAC CE signaling or UE-specific RRC signaling.
- FIG. 3 is a diagram illustrating a part of a configuration of a higher layer RRC signaling message according to an embodiment of the present invention.
- reference numeral 310 denotes an element related to configuration of a secondary cell among an RRCConnectionReconfiguration message.
- the information on the cell to be a candidate may be included as a simultaneous UCI transmission indicator of the cell, such as sCellUCI_SimultaneousTxIndicator 315.
- sCellUCI_SimultaneousTxIndicator may indicate that simultaneous UCI transmission of the secondary cell is True / False.
- corresponding indication information may be transmitted through MAC CE signaling activating carrier aggregation for a corresponding secondary cell.
- simultaneous UCI transmission indication information for the corresponding cell may be included. Accordingly, the UE may determine the UCI transmission scheme for the secondary cell according to the simultaneous UCI transmission indication of the cell included in the MAC CE signaling activated by the secondary cell.
- 4 is a diagram illustrating a MAC CE according to an embodiment of the present invention. 4 shows a configuration of a MAC header and a MAC CE.
- the LCID value of the activated / deactivated MAC CE is 11011.
- An embodiment of the MAC subheader indicating this is indicated by reference numeral 410 of FIG. 4.
- the MAC subheader for activating or deactivating the secondary cell is equal to 410.
- the last reserved bit is set to 1, such as "00001001" of reference numeral 420.
- 421 is set to '1' to activate the cell at SCellIndex 3
- the bit indicated by reference number 429 is also set to '1' so that UCI transmission at the secondary cell at SCellIndex 3 is performed simultaneously.
- an embodiment of the present invention may be applied to one or more, for example, a plurality of secondary cells, and SCellIndex is set to 2 when the MAC CE indicated by 420 is activated and is set to “00010101”.
- a cell of 4 and since the last reserved bit is '1', it may indicate that simultaneous UCI transmission is performed for the activated cell. In the above example, it may be indicated for each cell using a bit other than the last reserved bit or an area of a separate MAC payload.
- FIG. 5 is a diagram illustrating a process of controlling transmission of uplink control information in a plurality of serving cells in a terminal according to an embodiment of the present invention.
- the UE In order to control the transmission of uplink control information in a plurality of serving cells by the UE including Embodiments 1, 2, 3, and 4, the UE first compares the number K of UCIs to be transmitted simultaneously and the number M of UCIs that can be simultaneously transmitted (S510). . If the comparison result K is greater than M, the terminal selects M of the UCIs to be transmitted simultaneously (S520). As described in the first and second embodiments, the UCI of the serving cell having the lowest CIF may be selected, or a priority set according to the priority of the UCI, for example, the type of the UCI. Previously, HARQ ACK / NACK feedback for downlink data has been set to high priority, and SR and CQI / CSI feedback have been set to low priority.
- the UE may select the UCI based on the Carrier Indicator Field (CIF) of the serving cell among the K UCIs according to the first and fourth embodiments.
- the UE may select based on the priority set in the UCI among the K UCIs using the second embodiment and the fourth embodiment.
- the M When applied to Example 1/2, the M may be 1, in which case, the UE may select one UCI.
- the terminal may select based on the CIF of the serving cells in which uplink control information of each serving cell group is transmitted.
- the selecting of the S520 may be performed based on a step of defining differential priority for each serving cell group and priority for each serving cell group. It includes a step.
- the step of defining the priority may be implemented so that the priority definition of the master cell group is higher than the priority of the secondary cell group in defining the priority for each cell group for uplink control information transmission. have. This gives priority to the cell group itself, and when setting the CIF independently for each cell group, for example, set 0, 1, 2, ... to CIF for CCs constituting the master cell group in turn, The CCs constituting the secondary cell group may also be applied to the case where the CIF is set to 0, 1, 2, ... in order.
- the terminal transmits the selected M UCIs to a base station through a physical uplink control channel (PUCCH) of each serving cell (S530).
- PUCCH physical uplink control channel
- the third embodiment may be applied to select a UCI in which a simultaneous UCI transmission indication is set among UCIs not selected among the K UCIs, and transmit the same through a PUCCH or a PUSCH of a serving cell of the UCI.
- M is 1 and K is 2
- the lowest CIF or UCI with high priority is selected and transmitted to PUCCH
- UCI with simultaneous UCI transmission indication set as shown in FIG. 3 or 4 is PUCCH of the serving cell.
- it may be transmitted through the PUSCH.
- the UE may receive the RCI signaling method of FIG. 3 or the MAC signaling of FIG. 4 as a method of configuring a UCI simultaneous Tx indicator for the secondary cell from the base station.
- M is a natural number that is less than or equal to the number N of serving cells and is 1 or more.
- the terminal may receive the M value from the base station. That is, the information on the M may be received from the base station by RRC or MAC signaling.
- the UE may exclude one or more UCI set to be transmitted in the PUSCH of the UCI in the selecting step. This is because there is no need to transmit on the PUCCH.
- the secondary UCI of the UCI may be transmitted to the piggyback (piggyback) on the PUSCH resource allocated to the terminal.
- FIG. 6 is a diagram illustrating a process of a base station controlling transmission of uplink control information in a plurality of serving cells according to an embodiment of the present invention.
- the base station receives UCI of M or less, which is the number of UCI simultaneous transmissions, from the terminal through a physical uplink control channel (PUCCH) of each serving cell (S610).
- the UCI below M are UCIs selected by the UE performing the process of FIG. 5.
- the base station checks the received UCI (S620). When the number of simultaneous UCIs K is greater than M, the UE transmits one or more UCIs smaller than K through the PUCCH, wherein M is a natural number equal to or smaller than N and the number of serving cells. In this case, the base station receives the UCI selected by the terminal.
- the base station may transmit the UCI simultaneous transmission indicator to the terminal in the third embodiment. That is, the base station transmits the simultaneous UCI transmission indicator for the secondary cell to the terminal by RRC or MAC signaling, an embodiment thereof has been described with reference to FIGS. 3 and 4.
- the base station may transmit information about the M to the terminal through RRC or MAC signaling.
- the base station may receive a UCI of a secondary cell among the UCIs as a piggyback on PUSCH resources allocated to the UE.
- a terminal and a base station for controlling uplink control channel transmission that independently transmits UCI for each serving cell Let's look at the configuration.
- FIG. 7 is a diagram illustrating a configuration of a user terminal according to another embodiment.
- the user terminal 700 includes a receiver 730, a controller 710, and a transmitter 720.
- the receiver 730 receives downlink control information, data, and a message from a base station through a corresponding channel.
- controller 710 may be configured to serve each serving cell when a scheduler for each serving cell is distributed in an inter-eNB carrier merge and a dual connectivity based carrier merge environment with a small cell required to perform the above-described present invention. To control the overall operation of the terminal according to the independent transmission of each UCI.
- the transmitter 720 transmits uplink control information, data, and a message to a base station through a corresponding channel.
- the control unit 710 may first transmit the number of UCIs and the number of UCIs that can be simultaneously transmitted. For comparison, if K is greater than M, M is selected among the simultaneous transmission UCI. As described above in the first and second embodiments, the controller 710 selects the UCI of the serving cell having the lowest CIF, or selects the priority set according to the priority of the UCI, for example, the type of the UCI. Can be. Alternatively, the UCI of the serving cell having the highest CIF may be selected.
- the UE may select the UCI based on the Carrier Indicator Field (CIF) of the serving cell among the K UCIs according to the first and fourth embodiments.
- the controller 710 may select the K UCI based on the priority set in the UCI using the second and fourth embodiments.
- M may be 1, in which case, the UE may select one UCI.
- the controller 710 may select based on the CIF of the serving cells in which uplink control information of each serving cell group is transmitted.
- the serving cell is divided into two or more serving cell groups, and the control unit 710 may define differential priorities for each serving cell group, and select the serving cells based on the priority of each serving cell group. .
- the control unit 710 prioritizes the priority of the master cell group over the priority of the secondary cell group in defining the priority for each cell group for uplink control information transmission. It can be implemented to be definition. This gives priority to the cell group itself, and when setting CIF independently for each cell group, for example, set 0, 1, 2, ... to CIF for CCs constituting the master cell group, The CCs constituting the secondary cell group may also be applied to the case where the CIF is set to 0, 1, 2, ... in order.
- the transmitter 720 transmits the selected M UCIs to a base station through a physical uplink control channel (PUCCH) of each serving cell (S530).
- PUCCH physical uplink control channel
- the third embodiment may be applied to select a UCI in which a simultaneous UCI transmission indication is set among UCIs not selected among the K UCIs, and transmit the same through a PUCCH or a PUSCH of a serving cell of the UCI.
- M is 1 and K is 2
- the lowest CIF or UCI with high priority is selected and transmitted to PUCCH
- UCI with simultaneous UCI transmission indication set as shown in FIG. 3 or 4 is PUCCH of the serving cell.
- it may be transmitted through the PUSCH.
- the receiver 730 may receive the RRC signaling method of FIG. 3 or the MAC signaling of FIG. 4 so that the UE sets a simultaneous UCI Tx indicator for the secondary cell from the base station.
- M is a natural number that is less than or equal to the number N of serving cells and is 1 or more.
- the terminal may receive the M value from the base station. That is, the information on the M may be received from the base station by RRC or MAC signaling.
- control unit 710 may exclude one or more UCI set to be transmitted in the PUSCH of the UCI in the selecting step. This is because there is no need to transmit on the PUCCH.
- the transmitter 720 may transmit the secondary UCI among the UCI to the piggyback on the PUSCH resource allocated to the terminal.
- FIG. 8 is a diagram illustrating a configuration of a base station according to another embodiment.
- the base station 800 includes a controller 810, a transmitter 820, and a receiver 830.
- the controller 810 independently transmits UCI for each serving cell when a scheduler for each serving cell is distributed in an eNB-carrier aggregation between eNBs and a dual connectivity-based carrier aggregation environment for implementing the above-described invention.
- the transmitter 1020 and the receiver 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.
- the receiving unit 830 of the base station receives UCI of M or less, which is the number of UCI simultaneous transmissions, from the terminal through the physical uplink control channel (PUCCH) of each serving cell.
- the UCI below M are UCIs selected by the UE performing the process of FIG. 5.
- the control unit 810 of the base station checks the received UCI. When the number of simultaneous UCIs K is greater than M, the UE transmits one or more UCIs smaller than K through the PUCCH, wherein M is a natural number equal to or smaller than N and the number of serving cells. In this case, the receiver 730 of the base station receives the UCI selected by the terminal.
- the transmitter 820 of the base station may transmit the UCI simultaneous transmission indicator to the terminal in the third embodiment. That is, the transmitter 820 transmits the simultaneous UCI transmission indicator for the secondary cell to the terminal through RRC or MAC signaling. An embodiment thereof has been described with reference to FIGS. 3 and 4.
- the transmitter 820 may transmit information about the M to the terminal through RRC or MAC signaling.
- the receiver 830 may receive a UCI of a secondary cell among the UCIs as a piggyback on the PUSCH resource allocated to the UE.
- a low CIF may be selected first or a high CIF may be selected in selecting a serving cell.
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Abstract
Description
| 인덱스 | LCID 값 |
| 00000 | CCCH |
| 00001-01010 | 논리 채널의 식별정보(Identity of the logical channel) |
| 01011-11010 | 예약(Reserved) |
| 11011 | 활성화/비활성화(Activation/Deactivation) |
| 11100 | UE CR 식별정보(UE Contention Resolution Identity) |
| 11101 | TA 명령(Timing Advance Command) |
| 11110 | DRX 명령(DRX Command) |
| 11111 | 패딩(Padding) |
Claims (20)
- 단말이 복수의 서빙 셀에서 상향 링크 제어 정보의 전송을 제어하는 방법에 있어서,동시 전송할 UCI의 개수 K와 UCI 동시 전송 가능한 개수인 M을 비교하여, 상기 비교 결과 K가 M보다 큰 경우 상기 동시 전송할 UCI 중 M개를 선택하는 단계; 및상기 선택한 M개의 UCI를 각 서빙 셀의 PUCCH(Physical Uplink Control CHannel)를 통해 기지국으로 전송하는 단계를 포함하며,상기 M은 서빙 셀의 개수 N보다 작거나 같으며 1 이상인 자연수인 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 선택하는 단계는 상기 K개의 UCI 중 서빙 셀의 CIF(Carrier indicator Field)를 기준으로 선택하는 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 서빙 셀은 둘 이상의 서빙 셀 그룹들로 나뉘어지며,상기 선택하는 단계는 둘 이상의 서빙 셀 그룹들의 상향 링크 제어 정보가 전송되는 서빙 셀들의 CIF를 기준으로 선택하거나, 또는서빙 셀 그룹 별 차등적인 우선 순위를 정의하고 해당 서빙 셀 그룹 별 우선 순위를 기준으로 선택하는 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 선택하는 단계는 상기 K개의 UCI 중 UCI에 설정된 우선 순위를 기준으로 선택하는 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 전송하는 단계는 상기 K개의 UCI 중 선택되지 않은 UCI 중에서 동시 UCI 전송 지시가 설정된 UCI를 선택하여 상기 UCI의 서빙 셀의 PUCCH 또는 PUSCH(Physical Uplink Shared CHannel)를 통하여 전송하는 것을 특징으로 하는 방법.
- 제 5항에 있어서,상기 기지국으로부터 세컨더리 셀에 대한 동시 UCI 전송 지시자를 RRC 또는 MAC 시그널링으로 수신하는 단계를 더 포함하는 방법.
- 제 1항에 있어서,상기 UCI 중 PUSCH에서 전송하도록 설정된 하나 이상의 UCI는 상기 선택하는 단계에서 제외시키는 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 UCI 중 세컨더리 셀(Secondary Cell)의 UCI를 상기 단말이 할당된 PUSCH 자원에서 피기 백(piggyback)으로 전송하는 것을 특징으로 하는 방법.
- 기지국이 복수의 서빙 셀에서 상향 링크 제어 정보를 수신하는 방법에 있어서,단말로부터 UCI 동시 전송 가능한 개수인 M 이하의 UCI를 각 서빙 셀의 PUCCH(Physical Uplink Control CHannel)를 통해 수신하는 단계; 및상기 UCI를 확인하는 단계를 포함하며,상기 단말이 동시 전송할 UCI의 개수 K가 상기 M보다 큰 경우 K 보다 작은 하나 이상의 UCI가 상기 PUCCH를 통하여 전송된 것을 특징으로 하며, 상기 M은 서빙 셀의 개수 N보다 작거나 같으며 1 이상인 자연수인 것을 특징으로 하는 방법.
- 제 9항에 있어서,상기 기지국은 상기 UCI 중 세컨더리 셀(Secondary Cell)의 UCI를 상기 단말에게 할당된 PUSCH 자원에서 피기 백(piggyback)으로 수신하는 것을 특징으로 하는 방법.
- 기지국으로부터 신호를 수신하는 수신부;동시 전송할 UCI의 개수 K와 UCI 동시 전송 가능한 개수인 M을 비교하여, 상기 비교 결과 K가 M보다 큰 경우 상기 동시 전송할 UCI 중 M개를 선택하는 제어부; 및상기 선택한 M개의 UCI를 각 서빙 셀의 PUCCH(Physical Uplink Control CHannel)를 통해 기지국으로 전송하는 송신부를 포함하며,상기 M은 서빙 셀의 개수 N보다 작거나 같으며 1 이상인 자연수인 것을 특징으로 하는 복수의 서빙 셀에서 상향 링크 제어 정보의 전송을 제어하는 단말.
- 제 11항에 있어서,상기 제어부는 상기 K개의 UCI 중 서빙 셀의 CIF(Carrier indicator Field)를 기준으로 선택하는 것을 특징으로 하는 단말.
- 제 11항에 있어서,상기 서빙 셀은 둘 이상의 서빙 셀 그룹들로 나뉘어지며,상기 제어부는 둘 이상의 서빙 셀 그룹들의 상향 링크 제어 정보가 전송되는 서빙 셀들의 CIF를 기준으로 선택하거나, 또는상기 제어부는 서빙 셀 그룹 별 차등적인 우선순위를 정의하고, 해당 서빙 셀 그룹 별 우선 순위를 기준으로 선택하는 것을 특징으로 하는 단말.
- 제 11항에 있어서,상기 제어부는 상기 K개의 UCI 중 UCI에 설정된 우선 순위를 기준으로 선택하는 것을 특징으로 하는 단말.
- 제 11항에 있어서,상기 송신부는 상기 K개의 UCI 중 선택되지 않은 UCI 중에서 동시 UCI 전송 지시가 설정된 UCI를 선택하여 상기 UCI의 서빙 셀의 PUCCH 또는 PUSCH(Physical Uplink Shared CHannel)를 통하여 전송하는 것을 특징으로 하는 단말.
- 제 15항에 있어서,상기 수신부는 상기 기지국으로부터 세컨더리 셀에 대한 동시 UCI 전송 지시자를 RRC 또는 MAC 시그널링으로 수신하는 것을 특징으로 하는 단말.
- 제 11항에 있어서,상기 제어부는 상기 UCI 중 PUSCH에서 전송하도록 설정된 하나 이상의 UCI를 상기 선택에서 제외시키는 것을 특징으로 하는 단말.
- 제 11항에 있어서,상기 UCI 중 세컨더리 셀(Secondary Cell)의 UCI를 상기 송신부가 상기 단말에 할당된 PUSCH 자원에서 피기 백(piggyback)으로 전송하는 것을 특징으로 하는 단말.
- 단말에게 신호를 전송하는 송신부;단말로부터 UCI 동시 전송 가능한 개수인 M 이하의 UCI를 각 서빙 셀의 PUCCH(Physical Uplink Control CHannel)를 통해 수신하는 수신부; 및상기 UCI를 확인하는 제어부를 포함하며,상기 단말이 동시 전송할 UCI의 수 K가 상기 M보다 큰 경우 K 보다 작은 하나 이상의 UCI가 상기 PUCCH를 통하여 전송된 것을 특징으로 하며, 상기 M은 서빙 셀의 개수 N보다 작거나 같으며 1 이상인 자연수인 것을 특징으로 하는 복수의 서빙 셀에서 상향 링크 제어 정보를 수신하는 기지국.
- 제 19항에 있어서,상기 수신부는 상기 UCI 중 세컨더리 셀(Secondary Cell)의 UCI를 상기 단말에게 할당된 PUSCH 자원에서 피기 백(piggyback)으로 수신하는 것을 특징으로 하는 기지국.
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| US14/780,176 US9854600B2 (en) | 2013-03-28 | 2014-03-25 | Method for controlling transmission of uplink control information on plurality of serving cells, and apparatus therefor |
| CN201480018997.1A CN105075149B (zh) | 2013-03-28 | 2014-03-25 | 在多个服务小区中控制上行链路控制信息传输的方法及其装置 |
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| KR10-2013-0155297 | 2013-12-13 | ||
| KR1020130155297A KR101566943B1 (ko) | 2013-03-28 | 2013-12-13 | 복수의 서빙 셀에서 상향 링크 제어 정보의 전송을 제어하는 방법 및 그 장치 |
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| ZTE: "Remaining Open issues of Simultaneous transmission of UL Channels/Signals", R1-110165, 3GPP TSG RAN WG1 MEETING #63BIS, 17 January 2011 (2011-01-17), DUBLIN, IRELAND ., Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/wg1_r11/TSGR1 _63b/Docs> * |
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