WO2012011704A2 - 다중 노드 시스템에서 피드백 신호를 전송하는 방법 및 장치 - Google Patents
다중 노드 시스템에서 피드백 신호를 전송하는 방법 및 장치 Download PDFInfo
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- WO2012011704A2 WO2012011704A2 PCT/KR2011/005264 KR2011005264W WO2012011704A2 WO 2012011704 A2 WO2012011704 A2 WO 2012011704A2 KR 2011005264 W KR2011005264 W KR 2011005264W WO 2012011704 A2 WO2012011704 A2 WO 2012011704A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting a feedback signal by a terminal in a multi-node system.
- the node may mean an antenna or a group of antennas separated by a predetermined interval from a distributed antenna system (DAS), but may be used in a broader sense without being limited to this meaning. That is, the node may be a picocell base station (PeNB), a home base station (HeNB), a remote radio head (RRH), a remote radio unit (RRU), a repeater, a distributed antenna (group), or the like.
- PeNB picocell base station
- HeNB home base station
- RRH remote radio head
- RRU remote radio unit
- Wireless communication systems with high density nodes can exhibit higher system performance by cooperation between nodes.
- BS Base Station
- ABS Advanced BS
- NB Node-B
- eNB eNode-B
- AP Access Point
- multi-node system a wireless communication system including a plurality of nodes
- a multi-node system In a multi-node system, if each node performs scheduling and handover with its cell identifier, such a multi-node system can be regarded as a multi-cell system.
- a multi-cell system When the coverage of each cell (ie, a node) in a multi-cell system overlaps each other, such a multi-cell system is called a multi-tier network.
- the present invention provides a method for transmitting a feedback signal to a base station by a terminal in a multi-node system and an apparatus therefor.
- a method for transmitting feedback information by a terminal comprising: transmitting first information for requesting resource allocation to the base station; And receiving, from the base station, information for requesting transmission of the second information necessary for the resource allocation, and transmitting the requested second information to the base station, wherein the feedback information includes the plurality of nodes. For at least one of, and may be transmitted to the base station together with the first information or the second information.
- each of the plurality of nodes may be wired to the base station.
- the node may also include a macro base station, a picocell base station (PeNB), a home base station (HeNB), a remote radio head (RRH), a repeater, an antenna, and a distributed antenna group.
- a macro base station a picocell base station (PeNB), a home base station (HeNB), a remote radio head (RRH), a repeater, an antenna, and a distributed antenna group.
- PeNB picocell base station
- HeNB home base station
- RRH remote radio head
- a repeater an antenna
- antenna and a distributed antenna group.
- the first information may be scheduling request (SR) information or bandwidth request (BR) information.
- SR scheduling request
- BR bandwidth request
- the second information may include band size information required for the resource allocation.
- the feedback information may be a reception signal level of at least one downlink signal of the plurality of nodes.
- the feedback information may be for the preset number of nodes.
- the feedback information may be for a node corresponding to a predetermined reception signal level or more.
- the feedback information may further include at least one of the number of nodes corresponding to the preset reception signal level and identification information.
- the first information for requesting resource allocation is transmitted to the base station.
- the feedback information is for at least one of the plurality of nodes, and may be transmitted to the base station together with the first information or the second information.
- each of the plurality of nodes may be wired to the base station.
- the node may also include a macro base station, a picocell base station (PeNB), a home base station (HeNB), a remote radio head (RRH), a repeater, an antenna, and a distributed antenna group.
- a macro base station a picocell base station (PeNB), a home base station (HeNB), a remote radio head (RRH), a repeater, an antenna, and a distributed antenna group.
- PeNB picocell base station
- HeNB home base station
- RRH remote radio head
- a repeater an antenna
- antenna and a distributed antenna group.
- the first information may be scheduling request (SR) information or bandwidth request (BR) information.
- SR scheduling request
- BR bandwidth request
- the second information may include band size information required for the resource allocation.
- the feedback information may be a reception signal level of at least one downlink signal of the plurality of nodes.
- the feedback information may be for a node corresponding to a predetermined reception signal level or more.
- the feedback information may further include at least one of the number of nodes corresponding to the preset reception signal level and identification information.
- the terminal may effectively transmit feedback information to the base station according to the present invention.
- FIG. 1 illustrates an example of a multi-node system.
- FIG. 2 illustrates a distributed antenna system that is an example of a multi-node system.
- FIG. 3 is a diagram illustrating an example of an information exchange step required for transmitting and receiving data between a base station and a terminal in a multi-node system.
- FIG. 4 is a diagram illustrating a structure of a frequency division duplex (FDD) radio frame in 3GPP LTE.
- FDD frequency division duplex
- FIG. 5 is a diagram illustrating a time division duplex (TDD) radio frame structure in 3GPP LTE.
- TDD time division duplex
- FIG. 6 illustrates an example of a resource grid for one downlink slot.
- FIG. 7 illustrates an example of a downlink subframe structure.
- FIG. 8 is a diagram illustrating an example in which a UE transmits information on a scheduling request in 3GPP LTE.
- FIG. 9 is a diagram illustrating an example in which a terminal transmits information on a band request in IEEE 802.16m.
- FIG. 10 is a diagram illustrating another example in which a terminal transmits information on a band request in IEEE 802.16m.
- FIG. 11 shows an example of a format of a band request header in IEEE 802.16m.
- FIG. 12 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced
- IEEE 802.16m is an evolution of IEEE 802.16e.
- FIG. 1 illustrates an example of a multi-node system.
- a multi-node system includes a base station and a plurality of nodes.
- a node indicated as an antenna node may mean a macro base station, a picocell base station (PeNB), a home base station (HeNB), a remote radio head (RRH), a repeater, a distributed antenna (group), and the like. Such a node may also be called a point.
- PeNB picocell base station
- HeNB home base station
- RRH remote radio head
- group a distributed antenna
- a distributed antenna system In a multi-node system, if all nodes are managed by a single base station controller and each node operates as part of a cell, this system is a distributed antenna system (DAS) system that forms one cell. Can be seen.
- DAS distributed antenna system
- individual nodes may be given a separate node ID, or may operate like some antenna groups in a cell without a separate node ID.
- DAS distributed antenna system
- the distributed antenna system is different from that in the conventional centralized antenna system (CAS), antennas of a base station are centrally arranged in a cell.
- a multi-node system if individual nodes have separate cell IDs and perform scheduling and handover, this may be viewed as a multi-cell (eg, macro cell / femto cell / pico cell) system. If the multiple cells are configured in an overlapping form according to coverage, this is called a multi-tier network.
- a multi-cell eg, macro cell / femto cell / pico cell
- FIG. 2 illustrates a distributed antenna system as an example of a multi-node system.
- a distributed antenna system includes a base station BS and a plurality of base station antennas (for example, ant 1 to ant 8, hereinafter, abbreviated as base station antennas).
- the antennas ant 1 to ant 8 may be wired to the base station BS.
- antennas are distributed in various locations within a cell without being concentrated at a specific point of the cell 15, for example, the cell.
- one antenna may exist at each spaced place in the cell (antenna 1 to antenna 4, antenna 6 to antenna 8), and multiple antennas such as antenna 5 (111).
- the fields 111-1, 111-2, and 111-3 may be distributed in a dense form.
- the densely located antennas may constitute one antenna node.
- Antenna coverage of the antennas may overlap so that transmission of rank 2 or more is possible.
- antenna coverage of each antenna may extend to adjacent antennas.
- terminals existing in the cell may vary in strength of signals received from the plurality of antennas according to positions, channel conditions, and the like in the cell. Referring to the example of FIG. 2, UE 1 may receive a signal having good reception sensitivity from antennas 1, 2, 5, and 6. On the other hand, the signal transmitted from the antennas 3, 4, 7, 8 may have a minimal effect on the terminal 1 due to path loss.
- UE 2 may receive a signal having good reception sensitivity from antennas 6 and 7, and a signal transmitted from the remaining antennas may be insignificant.
- UE 3 may receive a signal having good reception sensitivity only from antenna 3 and may have a weak strength enough to ignore signals of the other antennas.
- the terminal 1 may communicate with the antennas 1, 2, 5, and 6, and the terminal 2 may communicate with the antenna 7, and the terminal 3 with the antenna 3.
- the antennas 4 and 8 may transmit a signal for the terminal 2 or the terminal 3 or may not transmit any signal. That is, the antennas 4 and 8 may be operated in the off state in some cases.
- antennas (or antenna groups) allocated to each terminal may be different.
- the distributed antenna system may support a specific antenna (or a specific antenna group) among all antennas in the system for each terminal.
- the antenna supporting the terminal may be changed according to time.
- the information exchange step to be performed between the base station and the terminal in the multi-node system can be largely composed of four steps. That is, the method may include a cell entry step, a preparation step for node assignment of a base station, a node assignment step, and a data transmission / reception step. Hereinafter, this will be described in detail with reference to FIG. 3.
- FIG. 3 is a diagram illustrating an example of an information exchange step required for transmitting and receiving data between a base station and a terminal in a multi-node system.
- the base station informs the terminal of configuration information of the multi-node system in the cell entry step.
- the user equipment that is powered on again or enters a new cell while the power is turned off performs a cell entry operation (S310) such as synchronizing with the base station in step S310.
- the terminal may receive a synchronization channel (SCH) from the base station to synchronize with the base station and obtain information such as a cell ID. Thereafter, the user equipment may obtain in-cell broadcast information from the base station.
- SCH synchronization channel
- the UE may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell entry step (S310).
- DL RS downlink reference signal
- the configuration information of the multi-node system obtained by the terminal from the base station may include at least one of the total number of nodes, the total number of antennas, the number of antennas of each node, and the like in the multi-node system.
- the UE may perform a preparation step for node allocation from the base station.
- the base station acquires information necessary for allocating nodes to the terminal from the terminal.
- the base station may obtain the strength of the uplink signal, the uplink sounding signal, feedback information, and the like from the terminal.
- the preparation step for node allocation includes a step (S320) of first requesting transmission of necessary information to the terminal in order to obtain necessary information from the base station (S330).
- step S320 the base station receives information such as an uplink sounding signal request, a feedback request, a request for the type of information to be fed back by the terminal, and a request for the number of antenna nodes to be included in the feedback information of the terminal to the terminal.
- information such as an uplink sounding signal request, a feedback request, a request for the type of information to be fed back by the terminal, and a request for the number of antenna nodes to be included in the feedback information of the terminal to the terminal.
- the uplink sounding signal request is required when node assignment is performed based on the uplink sounding signal.
- the base station may request the contents of information to be included in the feedback together with the request for the feedback.
- the above-described information transmitted by the base station may be broadcasted to the terminals, or when the base station receives different kinds of feedback information for each terminal, it may be transmitted to the terminal or the terminal group unicast.
- the step S320 may be performed simultaneously with the step S310. That is, when transmitting the parameters of the multi-node system to the terminal in step S310, the uplink signal transmission request signal may be broadcast together.
- the above request may be omitted if it is defined in the standard and the terminal acquires the parameter of the multi-node system and then the feedback for the node allocation is promised.
- existing signaling information for a general communication operation may also be transmitted to the terminal.
- transmission power control information of each terminal may be transmitted together.
- Uplink signal transmission is performed at a predetermined time or when a request is made from a base station.
- the uplink signal is a signal required for the base station to allocate nodes to the terminals and may include an uplink sounding signal, a reference signal, various feedback signals, and the like.
- the terminal may measure the downlink signal strength of each node using a signal transmitted separately from each node and transmit the feedback signal to the base station as a feedback signal.
- the various feedback signals include a reception strength for each node of the uplink, a reception strength of a downlink transmission node selected by a terminal among all nodes of the downlink, a number of downlink transmission antenna nodes requested by the terminal, and a downlink that satisfies a predetermined condition.
- the number of transmission nodes of the downlink, the identifier (for example, the index) of the preferred transmission antenna node of all the transmission antenna nodes of the downlink, the identifier of the transmission antenna node satisfies a predetermined condition of all the transmission antenna nodes of the downlink It may include at least one of. In this case, the identifier of the node may be transmitted in the form of a bitmap.
- the preset condition is typically that the downlink signal reception strength of the node exceeds a threshold.
- the terminal is the index of the antenna nodes having the maximum reception strength, the reception strength, the index of the antenna nodes having the minimum reception strength, reception strength according to the number of nodes You can also feed back.
- step S340 of allocating a node to the terminal Thereafter, the base station performs step S340 of allocating a node to the terminal.
- the base station acquires feedback information through an uplink signal, an uplink sounding signal, and the like, and transmits node information allocated to each terminal. That is, the base station informs the base station antenna node information to be used for downlink or uplink for each terminal or terminal group.
- the antenna node allocation information may include information about a base station antenna or antenna node to be used in downlink or uplink, the number of antennas included in each antenna node to be used, a pilot pattern of each antenna, and the like.
- nodes used by the UE in downlink or uplink may be different.
- the terminals can receive data from the designated antenna node or transmit data to the base station through the designated antenna node (S350). Transmitting and receiving such data (S350) may be performed in a conventional manner under a designated antenna node.
- the cell entry step S310 may be performed only at the first cell entry, but the remaining steps S320, S330, S340, and S350 may be repeatedly performed.
- the first step is made in order from the cell entry step (S310) to the data transmission and reception step (S350), but after the data transmission and reception step (S350) or during the data transmission and reception step (S350) is performed for the node assignment step (S320, S330 may be performed.
- feedback information such as CQI and PMI transmitted during data exchange and various feedback information for antenna allocation in preparation steps S320 and S330 for node assignment may be transmitted together.
- the base station may transmit a feedback or uplink sounding signal request to the terminal together, and the base station may collect information for node allocation.
- the process does not necessarily go to the node assignment step (S340). That is, even when the base station acquires information through a feedback, an uplink sounding signal, or the like, the node allocation step S340 may be made more intermittently depending on the speed, position change, etc. of the terminal.
- node assignment step S340 If the base station changes the antenna node allocation information (node assignment step S340), the data is exchanged after the terminal recognizes the changed antenna node information, so the node assignment step S340 is performed separately from the data transmission and reception step S350. .
- preparation steps (S320 and S330) for node allocation proceed with the data transmission and reception step (S350), the steps may be performed in the following example sequence.
- parentheses mean that other steps are performed together during the step.
- radio frame applied in 3GPP LTE will be described as an example, but the content of the present invention is not limited thereto, and various types of radio frames may be applied.
- FIG. 4 shows a structure of a frequency division duplex (FDD) radio frame in 3GPP LTE.
- FDD frequency division duplex
- a radio frame consists of 10 subframes, and one subframe is defined as two consecutive slots.
- the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- Downlink in which each node or base station transmits a signal to a terminal
- uplink in which a terminal transmits a signal to each node or base station, are distinguished in a frequency domain.
- FIG. 5 shows a time division duplex (TDD) radio frame structure in 3GPP LTE.
- This radio frame structure is referred to as frame structure type 2.
- one radio frame is composed of two half-frames having a length of 10 ms and a length of 5 ms.
- One half frame also consists of five subframes having a length of 1 ms.
- One subframe is designated as one of an uplink subframe (UL subframe), a downlink subframe (DL subframe), and a special subframe.
- One radio frame includes at least one uplink subframe and at least one downlink subframe.
- One subframe is defined by two consecutive slots. For example, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
- the special subframe is a specific period for separating the uplink and the downlink between the uplink subframe and the downlink subframe.
- At least one special subframe exists in one radio frame, and the special subframe includes a downlink pilot time slot (DwPTS), a guard period, and an uplink pilot time slot (UpPTS).
- DwPTS is used for initial cell search, synchronization or channel estimation.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- One slot in the FDD and TDD radio frames includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
- the OFDM symbol is used to represent one symbol period since 3GPP LTE uses OFDMA in downlink, and may be called another term such as an SC-FDMA symbol according to a multiple access scheme.
- the RB includes a plurality of consecutive subcarriers in one slot in resource allocation units.
- the structure of the radio frame described with reference to FIGS. 4 and 5 is 3GPP TS 36.211 V8.3.0 (2008-05) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release) 8) "and sections 4.1 and 4.2.
- the structure of the above-described radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may be variously changed.
- FIG. 6 shows an example of a resource grid for one downlink slot.
- one downlink slot includes a plurality of OFDM symbols in a time domain.
- one downlink slot includes 7 OFDMA symbols, and one resource block (RB) is exemplarily described as including 12 subcarriers in a frequency domain, but is not limited thereto.
- RB resource block
- Each element on the resource grid is called a resource element, and one resource block RB includes 12 ⁇ 7 resource elements.
- the number N DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell.
- the resource grid for the downlink slot described above may also be applied to the uplink slot.
- FIG. 7 shows an example of a downlink subframe structure.
- a subframe includes two consecutive slots. Up to three OFDM symbols of the first slot in the subframe may be a control region to which downlink control channels are allocated, and the remaining OFDM symbols may be a data region to which a Physical Downlink Shared Channel (PDSCH) is allocated.
- PDSCH Physical Downlink Shared Channel
- the downlink control channel includes a PCFICH (Physical Control Format Indicator Channel), a PDCCH (Physical Downlink Control Channel), PHICH (Physical Hybrid-ARQ Indicator Channel).
- the PCFICH transmitted in the first OFDM symbol of the subframe carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
- Control information transmitted through the PDCCH is called downlink control information (DCI).
- DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmit power control command for certain UE groups.
- the PHICH carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for a hybrid automatic repeat request (HARQ) of uplink data. That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.
- HARQ hybrid automatic repeat request
- PDSCH is a channel through which control information and / or data is transmitted.
- the UE may read down the data transmitted through the PDSCH by decoding the downlink control information transmitted through the PDCCH.
- the terminal When the terminal acquires information on the configuration of the multi-node system through the cell entry step (S310), the terminal may transmit various feedback information to the base station in preparation steps (S320 and S330) for node allocation.
- the various feedback information includes a reception strength for each node of the uplink, a reception strength of a downlink transmission node selected by a terminal among all nodes of the downlink, a number of downlink transmission antenna nodes requested by the terminal, and a downlink that satisfies a predetermined condition.
- the number of transmission nodes of the downlink, the identifier (for example, the index) of the preferred transmission antenna node of all the transmission antenna nodes of the downlink, the identifier of the transmission antenna node satisfies a predetermined condition of all the transmission antenna nodes of the downlink It may include at least one of.
- the preset condition may typically be a condition in which the downlink signal reception strength of the node exceeds a threshold, and when the base station specifies the number of antenna nodes to feed back to the terminal, the terminal may be configured according to the number of nodes.
- the index and reception strength of the antenna nodes having the reception strength and the index or reception strength of the antenna nodes having the minimum reception strength may be transmitted as feedback information.
- various feedback information is referred to as preferred antenna node information.
- general feedback information for example, CQI, PMI, RI, ACK / NACK information, etc.
- preferred antenna node information various feedback information is referred to as preferred antenna node information.
- the above-described information on the preferred antenna node information is merely exemplary and may further include a feedback signal of more various types.
- a method of transmitting preferred antenna node information through a transmitted channel for example, an uplink feedback channel of PUCCH, PUSCH, or IEEE 802.16m in LTE.
- the second method is to feed back the preferred antenna node information on the network entry.
- the network entry may include a situation of initial entry, re-entry, handover, etc.
- the terminal reports the preferred antenna node information to the base station in the negotiation process between the terminal and the base station at the time of network entry.
- the base station can advantageously determine whether to allocate resources and allow cell entry to the terminal in consideration of traffic load for each antenna node.
- the feedback on the preferred antenna node information may be transmitted not only through a channel through which general feedback information is transmitted but also through a channel used for initial access (for example, an uplink feedback channel of PUCCH, PUSCH, or IEEE 802.16m in LTE). Can be.
- a channel used for initial access for example, an uplink feedback channel of PUCCH, PUSCH, or IEEE 802.16m in LTE.
- RACH random access channel
- the UE that prefers antenna node #n has a random access having an index from 8n to 8n + 7 of preamble indexes 0 to 63. Only preambles can be selected and used.
- the terminal may perform synchronization using a synchronization signal (SFH) before a network entry and may predetermine a preferred antenna node by using a signal transmitted by being distinguished for each antenna node from the base station.
- FSH synchronization signal
- a ranging request message e.g., AAI_RNG-REQ in IEEE 802.16m, etc.
- a new message field that can be used for re-entry, handover, etc. may be created to allow the terminal to report the preferred antenna node information to the base station.
- the base station may request the terminal to feed back the preferred antenna node information through the existing message field or the new message field.
- bandwidth request BR
- SR scheduling request
- a network-connected terminal After network entry is completed, a network-connected terminal must first transmit a request for allocating UL resources to a base station for uplink transmission.
- the request to receive the UL resource is called a bandwidth request (BR) or scheduling request (SR).
- BR bandwidth request
- SR scheduling request
- BR bandwidth request
- SR scheduling request
- the terminal may transmit the preferred antenna node information together while transmitting a bandwidth request (BR) or scheduling request (SR) to the base station.
- BR bandwidth request
- SR scheduling request
- the base station after the terminal transmits a bandwidth request (BR) or scheduling request (SR) to the base station, the base station triggers transmission of information on the preferred antenna node to the terminal. After that, the UE can send the preferred antenna information to the base station using a feedback channel.
- BR bandwidth request
- SR scheduling request
- BR bandwidth request
- SR scheduling request
- FIG. 8 is a diagram illustrating an example in which a UE transmits information on a scheduling request in 3GPP LTE.
- the terminal If there is uplink information to be transmitted to the base station, the terminal first transmits information on a scheduling request for notifying the base station to the base station (S810).
- the information on the scheduling request may be transmitted in the form of PUSCH format 1, and indicates only presence of uplink information to be transmitted.
- the base station When the base station receives the information on the scheduling request, the base station transmits information to request the terminal to transmit information (for example, band information, etc.) necessary for allocating resources to the terminal (S820).
- information for example, band information, etc.
- the terminal When the terminal receives a request for information required to allocate resources from the base station, the terminal transmits the requested information to the base station through the PUSCH (S830).
- the base station may allocate resources to the terminal based on the received information, and thus the terminal may transmit uplink information to the base station.
- the terminal when the terminal transmits the requested information from the base station (S830), it may transmit the preferred antenna node information together.
- the preferred antenna node information may be included together with the information on the scheduling request and transmitted.
- the current PUCCH format 1 does not include other information and can only transmit presence or absence of information to be transmitted, while other PUCCH formats may include a plurality of information. If the information on the scheduling request can be transmitted through another PUCCH format, the preferred antenna node information may also be included and transmitted.
- a process of allocating resources by transmitting information on a bandwidth request may be implemented in three steps or five steps.
- FIG 9 is a diagram illustrating an example in which the terminal transmits information on a band request in IEEE 802.16m.
- the terminal may transmit a quick access message including a bandwidth request (BR) preamble sequence for requesting allocation of a band for resource allocation and an identifier of the terminal to the base station (see FIG. S910).
- BR bandwidth request
- the identifier of the terminal included in the quick access message may include a station ID (STID).
- TID station ID
- the base station transmits an acknowledgment (ACK) acknowledgment (ACK) for the transmitted information to the terminal (S920), and transmits uplink grant (grant) information for allocating resources for uplink transmission to the terminal (S930).
- ACK acknowledgment
- ACK acknowledgment acknowledgment
- grant uplink grant
- the terminal may transmit uplink information to the base station using the allocated resources (S940).
- the terminal may include the preferred antenna node information in a quick access message and transmit the same to the base station. That is, a quick access message including the identifier information of the terminal and the preferred antenna node information may be transmitted to the base station.
- FIG. 10 is a diagram illustrating another example in which a terminal transmits information on a band request in IEEE 802.16m.
- the terminal may transmit a bandwidth request preamble sequence for requesting allocation of a band for resource allocation to the base station (S1010).
- the UE may transmit the quick access message to the base station as an optional process, or may not transmit the quick access message.
- the base station transmits an acknowledgment acknowledgment (ACK) for the transmitted information to the terminal (S1020), and requests the terminal to transmit a band request (BR) header for resource allocation (S1030).
- ACK acknowledgment acknowledgment
- BR band request
- the terminal Upon receiving this, the terminal transmits a band request (BR) header to the base station (S1040).
- the bandwidth request (BR) header may include an identifier of the terminal.
- the identifier of the terminal included in the band request (BR) header may include a station ID (STID).
- the base station receiving the bandwidth request (BR) header transmits uplink grant information for allocating resources for uplink transmission to the terminal (S1050).
- the terminal may transmit uplink information to the base station using the allocated resources (S1060).
- the terminal may include the preferred antenna node information in the band request (BR) header to transmit to the base station.
- BR band request
- 11 is a diagram illustrating an example of a format of a band request header in IEEE 802.16m.
- the format of the band request (BR) header includes a 4-bit space that is reserved, and the preferred antenna node information may be included and transmitted to the base station.
- the terminal transmits a quick access message (quick access message) to the base station in step S1010
- the preferred antenna node information may be included and transmitted to the base station.
- the quick access message includes the preferred antenna node information, it is transmitted to the base station through a band request (BR) channel.
- BR band request
- the terminal can transmit the preferred antenna node information to the base station after the base station triggers the transmission of information on the preferred antenna node to the terminal, a simplified procedure It is efficient because the preferred antenna node information can be transmitted to the base station.
- FIG. 12 is a block diagram illustrating a base station and a terminal.
- the base station 1210 includes a processor 1211, a memory 1212, and an RF unit 1213.
- the RF unit 1213 may be implemented by being divided into a transmission module and a reception module.
- Processor 1211 implements the proposed functions, processes, and / or methods.
- the memory 1212 is connected to the processor 1211 and stores various information for driving the processor 1211.
- the RF unit 1213 is connected to the processor 1211 and transmits and / or receives a radio signal.
- the RF unit 1213 may be configured of a plurality of nodes connected to the base station 1210 by wire.
- the terminal 1220 includes a processor 1221, a memory 1222, and an RF unit 1223.
- the RF unit 1223 may be implemented by being divided into a transmission module and a reception module.
- the processor 1211 transmits first information on a scheduling request (SR) to the base station through the transmission module to inform whether the information to be transmitted to the base station exists, and the second required for scheduling.
- Receives information requesting the transmission of information from the base station through the receiving module controls to transmit the requested second information to the base station through the transmitting module, the feedback information is transmitted with the first information or the second information
- the module may be controlled to be transmitted to the base station.
- the memory 1222 is connected to the processor 1221 and stores various information for driving the processor 1221.
- the RF unit 1223 is connected to the processor 1221 and transmits and / or receives a radio signal.
- Processors 1211 and 1221 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
- the memories 1212 and 1222 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
- the RF unit 1213 and 1223 may include one or more antennas for transmitting and / or receiving a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. Modules may be stored in memories 1212 and 1222 and executed by processors 1211 and 1221.
- the memories 1212 and 1222 may be inside or outside the processors 1211 and 1221, and may be connected to the processors 1211 and 1221 by various well-known means.
- the invention can be implemented in hardware, software or a combination thereof.
- an application specific integrated circuit ASIC
- DSP digital signal processing
- PLD programmable logic device
- FPGA field programmable gate array
- the module may be implemented as a module that performs the above-described function.
- the software may be stored in a memory unit and executed by a processor.
- the memory unit or processor may employ various means well known to those skilled in the art.
- the present invention can be applied to a multi-node system and a wireless communication system.
- the present invention may be applied to a wireless mobile communication device used for a cellular system.
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Abstract
Description
Claims (17)
- 복수의 노드 및 상기 복수의 노드를 제어하는 기지국을 포함하는 다중 노드 시스템에서 단말이 피드백 정보를 전송하는 방법에 있어서,자원 할당을 요청하는 제 1 정보를 상기 기지국으로 전송하는 단계;상기 자원 할당을 위해 필요한 제 2 정보의 전송을 요청하는 정보를 상기 기지국으로부터 수신하는 단계; 및상기 요청 받은 제 2 정보를 상기 기지국으로 전송하는 단계를 포함하되.상기 피드백 정보는 상기 복수의 노드 중 적어도 하나에 대한 것이고, 상기 제 1 정보 또는 상기 제 2 정보와 함께 상기 기지국으로 전송되는 것을 특징으로 하는, 피드백 정보 전송 방법.
- 제 1항에 있어서,상기 복수의 노드 각각은 상기 기지국과 유선으로 연결된 것을 특징으로 하는, 피드백 정보 전송 방법.
- 제 1항에 있어서,상기 노드는 매크로 기지국, 피코셀 기지국(PeNB), 홈 기지국(HeNB), RRH(remote radio head), 중계기, 안테나 및 분산된 안테나 그룹을 포함하는, 피드백 정보 전송 방법.
- 제 1항에 있어서,상기 제 1 정보는 스케줄링 요청(Scheduling Request: SR) 정보 또는 대역 요청(Bandwidth Request: BR) 정보인 것을 특징으로 하는, 피드백 정보 전송 방법.
- 제 1항에 있어서,상기 제 2 정보는 상기 자원 할당을 위해 필요한 대역 크기 정보를 포함하는 것을 특징으로 하는, 피드백 정보 전송 방법.
- 제 1항에 있어서,상기 피드백 정보는 상기 복수의 노드 중 적어도 하나의 하향링크 신호에 대한 수신 신호 레벨인 것을 특징으로 하는, 피드백 정보 전송 방법.
- 제 6항에 있어서,상기 단말이 피드백 할 노드의 개수가 기 설정된 경우,상기 피드백 정보는 상기 기 설정된 개수의 노드에 대한 것을 특징으로 하는, 피드백 정보 전송 방법.
- 제 6항에 있어서,상기 피드백 정보는 기 설정된 수신 신호 레벨 이상에 해당하는 노드에 대한 것을 특징으로 하는, 피드백 정보 전송 방법.
- 제 8항에 있어서,상기 피드백 정보는 상기 기 설정된 수신 신호 레벨 이상에 해당하는 노드의 개수 및 식별 정보 중 적어도 하나를 더 포함하는 것을 특징으로 하는, 피드백 정보 전송 방법.
- 복수의 노드 및 상기 복수의 노드를 제어하는 기지국을 포함하는 다중 노드 시스템에서 피드백 정보를 전송하는 단말에 있어서,자원 할당을 요청하는 제 1 정보를 상기 기지국으로 전송하기 위한 전송 모듈;상기 자원 할당을 위해 필요한 제 2 정보의 전송을 요청하는 정보를 상기 기지국으로부터 수신하기 위한 수신 모듈; 및상기 요청 받은 제 2 정보를 상기 전송 모듈을 통해 상기 기지국으로 전송하도록 제어하는 프로세서를 포함하되,상기 피드백 정보는 상기 복수의 노드 중 적어도 하나에 대한 것이고, 상기 제 1 정보 또는 상기 제 2 정보와 함께 상기 기지국으로 전송되는 것을 특징으로 하는, 단말.
- 제 10항에 있어서,상기 복수의 노드 각각은 상기 기지국과 유선으로 연결된 것을 특징으로 하는, 단말.
- 제 10항에 있어서,상기 노드는 매크로 기지국, 피코셀 기지국(PeNB), 홈 기지국(HeNB), RRH(remote radio head), 중계기, 안테나 및 분산된 안테나 그룹을 포함하는, 단말.
- 제 10항에 있어서,상기 제 1 정보는 스케줄링 요청(Scheduling Request: SR) 정보 또는 대역 요청(Bandwidth Request: BR) 정보인 것을 특징으로 하는, 단말.
- 제 10항에 있어서,상기 제 2 정보는 상기 자원 할당을 위해 필요한 대역 크기 정보를 포함하는 것을 특징으로 하는, 단말.
- 제 10항에 있어서,상기 피드백 정보는 상기 복수의 노드 중 적어도 하나의 하향링크 신호에 대한 수신 신호 레벨인 것을 특징으로 하는, 단말.
- 제 15항에 있어서,상기 피드백 정보는 기 설정된 수신 신호 레벨 이상에 해당하는 노드에 대한 것을 특징으로 하는, 단말.
- 제 16항에 있어서,상기 피드백 정보는 상기 기 설정된 수신 신호 레벨 이상에 해당하는 노드의 개수 및 식별 정보 중 적어도 하나를 더 포함하는 것을 특징으로 하는, 단말.
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Also Published As
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US9867165B2 (en) | 2018-01-09 |
KR20130112853A (ko) | 2013-10-14 |
WO2012011704A3 (ko) | 2012-04-05 |
US20130115966A1 (en) | 2013-05-09 |
KR101850722B1 (ko) | 2018-05-31 |
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