WO2012108605A1 - 무선 접속 시스템에서 인접 셀 간 간섭을 회피하기 방법 - Google Patents
무선 접속 시스템에서 인접 셀 간 간섭을 회피하기 방법 Download PDFInfo
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- WO2012108605A1 WO2012108605A1 PCT/KR2011/007421 KR2011007421W WO2012108605A1 WO 2012108605 A1 WO2012108605 A1 WO 2012108605A1 KR 2011007421 W KR2011007421 W KR 2011007421W WO 2012108605 A1 WO2012108605 A1 WO 2012108605A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/04—Traffic adaptive resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1861—Physical mapping arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
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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
- H04W72/27—Control channels or signalling for resource management between access points
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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
Definitions
- the present disclosure relates to a wireless access system, and more particularly, to a method for avoiding inter-cell interference (ICI) in uplink.
- ICI inter-cell interference
- 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) -Advanced is a next-generation mobile communication system standard that expands cell coverage by installing relay nodes (RNs) in shaded areas and cell boundary areas. It supports multi-hop relay transmission technology that can be provided.
- RNs relay nodes
- Orthogonal Frequency-Division Multiple Access (OFDMA) technology is a modulation and demodulation scheme for overcoming multipath fading in a wireless channel, and uses multiple subcarriers to flexibly allocate time, frequency, and power resources to multiple users. There is an advantage to this.
- OFDMA Orthogonal Frequency-Division Multiple Access
- RA Resource Allocation
- OFDMA Resource Allocation
- a method of reallocating a resource in which collision occurs within relay node coverage to avoid inter-cell interference (ICI) while implementing a full dynamic RA method for each cell The purpose is to provide.
- HARQ process automatic HARQ process
- a method of operating a relay node (RN) for avoiding inter-cell interference (ICI) in neighboring cells in a wireless access system includes, in an nth subframe, overhearing a physical downlink control channel (PDCCH) transmitted by a plurality of base stations sharing the relay node to terminals within coverage of each base station, and the PDCCH is upward.
- PDCCH physical downlink control channel
- a link grant (UL grant); demodulating the PDCCH from an n + 1 th subframe to an n + 2 th subframe; Reallocating resource regions allocated to the terminals in the PDCCH when collision results from resource regions as a result of the demodulation; Transmitting control information indicating the reallocated resource region to each base station; overhearing a physical uplink shared channel (PUSCH) transmitted by the terminals to each base station in an n + 4th subframe; Demodulating the PUSCH; Transmitting the demodulated result to each base station; in the n + 8th subframe, listening to the updated PDCCH reflecting the response to the PUSCH transmitted by each base station and the reallocated resource region; and the response includes an acknowledgment (ACK) or a negative response ( NACK);
- the method may include retransmitting the PUSCH transmitted in the n + 4th subframe to the base station transmitting the NACK based on the updated PDCCH.
- the transmitting of the control information to each base station may include: comparing resource regions allocated to terminals within the relay node coverage through the downlink signal to determine whether there is a resource region in which collision occurs; When there is a resource region where a collision occurs as a result of the checking, the method may include performing a resource reassignment process for the resource region in which the collision occurs.
- the performing of the resource reallocation process may include exchanging a resource region where the collision occurs with a resource region allocated to terminals outside the relay node coverage.
- the exchanging with the resource region may include a signal-to-interference plus noise ratio (SINR) value of the resource region in which the collision occurs and an SINR of a resource region allocated to terminals outside the relay node coverage. Comparing the values respectively; As a result of the comparison, it may be characterized in that it comprises the step of determining the resource region to exchange the smallest difference in the SINR value.
- SINR signal-to-interference plus noise ratio
- the plurality of base stations may include three base stations, and the relay node may be a shared relay node (SRN) shared by the three base stations.
- SRN shared relay node
- the method may further include transmitting whether the demodulation succeeds to each base station.
- the method may further include transmitting to each base station.
- the relay node may be characterized by using X2 signaling with the plurality of base stations.
- the response to the PUSCH transmitted by the base stations in the n + 8th subframe is NACK when the relay node operates in the cooperative mode, and the relay node enters the non-cooperating mode.
- NACK When the relay node operates in the cooperative mode, and the relay node enters the non-cooperating mode.
- In the case of operation may be characterized as an ACK.
- a method of operating a base station for avoiding inter-cell interference (ICI) in a radio access system includes transmitting a physical downlink control channel (PDCCH) to a terminal within coverage of the base station in an nth subframe, wherein the PDCCH includes an uplink grant (UL grant); receiving control information indicating that a resource reallocation process is required for the PDCCH from a relay node (RN) in an n + 3th subframe; receiving a physical uplink shared channel (PUSCH) from the terminal in an n + 4th subframe; Demodulating the received PUSCH; Reallocating a resource region allocated to the terminal in the PDCCH based on control information received from the relay node; In the n + 8th subframe, transmitting the updated PDCCH to the UE in response to the result of demodulating the PUSCH and the reallocation of the resource region, and the response is an acknowledgment (ACK) or a negative response ( NACK);
- PDCCH physical downlink control channel
- UL grant uplink grant
- Reassigning the allocated resource region in the nth subframe may include comparing resource regions allocated to terminals within the relay node coverage through the downlink signal to determine whether there is a resource region in which collision occurs.
- the method may include performing a resource reassignment process for the resource region in which the collision occurs.
- the performing of the resource reallocation process may include exchanging a resource region where the collision occurs with a resource region allocated to terminals outside the relay node coverage.
- the exchanging with the resource region may include a signal-to-interference plus noise ratio (SINR) value of the resource region in which the collision occurs and an SINR of a resource region allocated to terminals outside the relay node coverage. Comparing the values respectively; As a result of the comparison, it may be characterized in that it comprises the step of determining the resource region to exchange the smallest difference in the SINR value.
- SINR signal-to-interference plus noise ratio
- the relay node may be a shared relay node (SRN) shared by a plurality of base stations.
- SRN shared relay node
- the method may further include receiving whether the PUSCH is successfully demodulated from the relay node.
- the method may further include receiving whether the reception is successfully performed.
- the shared relay node when a shared relay node overhears a downlink or uplink signal between a base station and a terminal, and a resource region allocated to the terminals in the shared relay node collides with each other, the shared relay node reassigns a resource to the collided resource region, thereby uplinking the uplink.
- ICI inter-cell interference
- FIG. 1 is a diagram illustrating a configuration of a relay backhaul link and a relay access link in a wireless communication system 100 to which an embodiment of the present specification can be applied.
- FIG. 2 is an internal block diagram of a base station 110 and a repeater 120 in a wireless communication system 100 to which an embodiment of the present disclosure can be applied.
- FIG. 3 is a diagram illustrating a multi-cell shared relay structure to which an embodiment of the present specification can be applied.
- FIGS. 4 (a) to (c) are diagrams illustrating a case where interference between neighbor cells occurs in a shared relay node based network structure.
- FIG. 5 illustrates a frame structure for applying a dynamic relay allocation method based on a shared relay node (SRN) to which an embodiment of the present specification can be applied.
- SRN shared relay node
- FIG. 6 (a) and (b) are diagrams illustrating signal transmission operations in respective time zones centered on the shared relay node SRN of FIG. 5.
- SRN shared relay node
- FIGS. 8 (a) to (c) are diagrams illustrating a case in which a collision occurs because the same resource block (RB) is allocated to terminals of a cell edge when each base station uses a dynamic resource allocation method.
- FIGS. 9 (a) to (c) are diagrams illustrating the division of RBs in a cell structure based on a shared relay node (SRN) according to the first embodiment of the present specification.
- FIG. 10 is a diagram illustrating an actual case of a collision resource block (RB) in a shared relay node (SRN) based cell structure according to the first embodiment of the present specification.
- FIG. 11 is a diagram illustrating a resource reallocation process for avoiding collision resource block (RB) in a shared relay node (SRN) based cell structure according to the first embodiment of the present specification.
- FIG. 12 is a diagram illustrating a resource reallocation method for ICI avoidance according to a third embodiment of the present specification.
- FIG. 14 (a) and (b) are diagrams illustrating a HARQ timing process of an SRN according to another embodiment of the present specification.
- FIG. 16 (a) and (b) are diagrams illustrating a HARQ timing process of an SRN according to another embodiment of the present specification.
- a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), and an advanced mobile station (AMS).
- the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
- the repeater may be variously referred to as a relay node (RN), a relay station (RS), a relay, or the like.
- a user equipment and a repeater may receive information from a base station through downlink, and the terminal and repeater may also transmit information through uplink.
- the information transmitted or received by the terminal and the repeater includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal and the repeater.
- FIG. 1 is a diagram illustrating a configuration of a relay backhaul link and a relay access link in a wireless communication system 100 to which an embodiment of the present specification can be applied.
- each of the uplink and downlink carrier frequencies while introducing a role of forwarding the link connection between the base station 110 and the terminal 130 to the repeater 120.
- Two kinds of links with different attributes are applied to the band.
- the connection link portion established between the link between the base station and the repeater is defined as a backhaul link.
- the transmission is performed in the frequency division duplex (FDD) or the time division duplex (TDD) method using the downlink resource, and is called backhaul downlink, and the transmission is performed in the FDD or TDD method using the uplink resource. It can be expressed as a backhaul uplink.
- FDD frequency division duplex
- TDD time division duplex
- the part of the connection link established between the relay and the terminals is defined and represented as a relay access link.
- a relay access link transmits using a downlink frequency band (in case of FDD) or a downlink subframe (in case of TDD), it is expressed as an access downlink and an uplink frequency band (in case of FDD).
- TDD uplink subframe
- the relay RN may receive information from the base station through the relay backhaul downlink, and may transmit information to the base station through the relay backhaul uplink.
- the repeater may transmit information to the terminal through the relay access downlink, and may receive information from the terminal through the relay access uplink.
- the repeater may perform an initial cell search operation such as synchronization with the base station. To this end, the repeater may receive a synchronization channel from the base station, synchronize with the base station, and obtain information such as a cell ID. Subsequently, the repeater may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the repeater may check the channel state of the relay backhaul downlink by receiving a relay backhaul downlink reference signal in an initial cell search step. The repeater may receive more detailed system information by receiving a relay-physical downlink control channel (R-PDCCH) and / or a relay-physical downlink control channel (R-PDSCH).
- R-PDCCH relay-physical downlink control channel
- R-PDSCH relay-physical downlink control channel
- the repeater may perform a random access procedure (Random Access Procedure) to the base station.
- the repeater may transmit a preamble through a physical random access channel (PRACH) and the like, and receive a response message for the random access through the R-PDCCH and the corresponding R-PDSCH.
- PRACH physical random access channel
- contention resolution procedures such as transmission of additional physical random access channels and R-PDCCH / R-PDSCH reception may be performed.
- the repeater performing the above-described procedure is a general uplink / downlink signal transmission procedure, and then the R-PDCCH / R-PDSCH and the relay-physical uplink shared channel (R-PUSCH) / relay- A physical uplink control channel (R-PUCCH: Relay-Physical Uplink Control CHannel) transmission may be performed.
- R-PUSCH relay-physical uplink shared channel
- R-PUCCH Relay-Physical Uplink Control CHannel
- the control information transmitted from the repeater to the base station through the uplink or received from the repeater by the base station includes an ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank.
- An indicator (Rank Indicator, RI) may be included.
- the repeater may transmit the above-described control information such as CQI, PMI, RI, etc. through the R-PUSCH / R-PUCCH.
- FIG. 2 is an internal block diagram of a base station 110 and a repeater 120 in a wireless communication system 100 to which an embodiment of the present disclosure can be applied.
- the wireless communication system 200 may include one or more base stations and / or one or more repeaters. .
- the base station 110 includes a transmit (Tx) data processor 111, a symbol modulator 112, a transmitter 113, a transmit / receive antenna 114, a processor 115, a memory 116, and a receiver ( 117, symbol demodulator 118, and receive data processor 119.
- Tx transmit
- symbol modulator 112 the base station 110 includes a transmit (Tx) data processor 111, a symbol modulator 112, a transmitter 113, a transmit / receive antenna 114, a processor 115, a memory 116, and a receiver ( 117, symbol demodulator 118, and receive data processor 119.
- the transmitter 113 and the receiver 117 may be represented by a radio (RF) communication unit.
- RF radio
- the repeater 120 may include a transmit (Tx) data processor 127, a symbol modulator 128, a transmitter 129, a transmit / receive antenna 121, a processor 125, a memory 126, a receiver 122, and a symbol. Demodulator 123, a receive data processor 124. Although antennas 114 and 121 are shown as one at base station 110 and repeater 120, respectively, base station 110 and repeater 120 are equipped with a plurality of antennas. Similarly, transmitter 129 and receiver 122 may be represented by a radio (RF) communication unit.
- RF radio
- the base station 110 and the repeater 120 according to the present invention supports a multiple input multiple output (MIMO) system.
- the base station 110 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.
- SU-MIMO single user-MIMO
- MU-MIMO multi-user-MIMO
- the transmit data processor 111 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
- the symbol modulator 112 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
- the symbol modulator 112 multiplexes data and pilot symbols and sends it to the transmitter 113.
- each transmission symbol may be a data symbol, a pilot symbol, or a null signal value.
- pilot symbols may be sent continuously.
- the pilot symbols may be frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), time division multiplexing (TDM), or code division multiplexing (CDM) symbols.
- Transmitter 113 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency upconverts) these analog signals to provide a wireless channel. Generates a downlink signal suitable for transmission via the downlink signal, which is then transmitted to the repeater via antenna 114.
- the antenna 121 receives the downlink signal from the base station and provides the received signal to the receiver 122.
- Receiver 122 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
- the symbol demodulator 123 demodulates the received pilot symbols and provides them to the processor 125 for channel estimation.
- the symbol demodulator 123 also receives a frequency response estimate for the downlink from the processor 125 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 124. Receive data processor 124 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
- Processing by the symbol demodulator 123 and the receiving data processor 124 is complementary to processing by the symbol modulator 112 and the transmitting data processor 111 at the base station 110, respectively.
- Repeater 120 is on the uplink, and transmit data processor 127 processes the traffic data to provide data symbols.
- the symbol modulator 128 can receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 129.
- the transmitter 129 receives and processes a stream of symbols to generate an uplink signal, which is transmitted to the base station 110 through the antenna 121.
- an uplink signal from the repeater 120 is received through the antenna 114, and the receiver 117 processes the received uplink signal to obtain samples.
- the symbol demodulator 118 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
- Receive data processor 119 processes the data symbol estimates to recover traffic data sent from repeater 120.
- Processors 115 and 125 of repeater 120 and base station 110 respectively direct (eg, control, coordinate, manage, etc.) operation at repeater 120 and base station 110.
- Each processor 115, 125 may be coupled with memory units 116, 126 that store program codes and data.
- Memory units 116 and 126 are coupled to processor 115 to store operating systems, applications, and general files.
- the processors 115 and 125 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like. Meanwhile, the processors 115 and 125 may be implemented by hardware or firmware, software, or a combination thereof. When implementing embodiments of the present invention using hardware, application specific integrated circuits (ASICs) or digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) configured to perform the present invention.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs Field Programmable Gate Arrays
- the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
- the firmware or software configured to be may be included in the processors 115 and 125 or may be stored in the memories 116 and 126 to be driven by the processors 115 and 125.
- the layers of the air interface protocol between the repeater and the base station between the wireless communication system (network) are based on the first three layers (L1), the second layer ( L2), and the third layer L3.
- the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
- a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
- the repeater, the base station can exchange RRC messages through the wireless communication network and the RRC layer.
- FIG. 3 is a diagram illustrating a multi-cell shared relay structure to which an embodiment of the present specification can be applied.
- ICI inter-cell interference
- the SRN is located at the center of three independent cells and performs data retransmission for improving throughput of a cell boundary region, which is a function of a basic relay.
- the SRN overhears the downlink signal and the uplink signal of the terminal 130 from each base station, and controls to avoid interference between terminals causing performance degradation in the cell boundary region. A detailed method thereof will be described later.
- the SRN is similar to the Type II RN functionally, but supports some additional functions than the Type II RN in terms of sharing control signals. That is, the SRN referred to herein has the same characteristics as 1 to 12 below.
- SRN does not have a separate cell ID and does not create another new cell.
- the SRN may transmit the PDSCH. (It may perform a function of relaying Rel-8 UEs.)
- Rel-8 UEs do not recognize the presence of an SRN.
- the SRN may transmit control (PDCCH, PUCCH, etc.) information to the eNBs through X2 signaling, but not to the UEs. (However, in the non-cooperative mode, the SRN can transmit the PDCCH signal without interference.)
- control PDCCH, PUCCH, etc.
- the SRN may restore control (PDCCH, PUCCH, etc.) information.
- SRN newly defines X2 signaling for sharing control information with eNB.
- SRN performs relay function only for UEs overhearing downlink and uplink signals of eNBs-UEs.
- the SRN has a function of identifying a UE in its area for coordination of intercell interference.
- SRN has a function of overhearing uplink SRS (Sounding Reference Signal) of UEs and discriminating them as UEs in the region of SRN based on an arbitrary threshold.
- SRS Sounding Reference Signal
- the SRN can overhear the Uplink SRS signal to measure the channel and change the MCS Level.
- the SRN overhears a plurality of eNBs-> UEs DL signals to share PDCCH and PDSCH information.
- the SRN overhears the UEs-> eNBs UL signal in its area to share PUCCH and PUSCH information.
- the SRN performs interference management between cells by using information shared by the methods 10 and 11 above.
- interference management between cells means all possible methods using the data obtained by the above 10 and 11.
- the SRN rather than the eNBs, becomes the center of the cluster, sharing control information of the eNBs, and determining UEs in which ICI occurs at the cell boundary, so that the SRN can directly avoid ICI avoidance. Provides a way to reallocate.
- FIGS. 4 (a) to (c) are diagrams illustrating a case where interference between neighbor cells occurs in a shared relay node based network structure.
- 4A illustrates a case in which ICI occurs using the same resource in each of the direct links between the three base stations 110 and the terminal 130 (eNB1-UE1, eNB2-UE2, eNB3-UE3).
- 4B illustrates a case in which ICI occurs using the same resource in a direct link between two base stations and terminals (eNB1-UE1 and direct links of eNB2-UE2).
- 4C illustrates that when the SRN 120 retransmits a signal, when the eNB1-UE1 direct link and the SRN-UE2 access link use the same resource, the signal of the access link of the SRN becomes an interference source to the UE1 to generate ICI. The case is shown.
- FIG. 5 shows a frame structure for applying a SRN-based dynamic resource allocation (dynamic RA) method to which an embodiment of the present specification can be applied.
- dynamic RA dynamic resource allocation
- FIG. 5 shows a frame structure in each time zone centered on the SRN.
- the eNB transmits a data packet to UE M , and the SRN simultaneously overhears a packet transmitted by the eNB.
- the eNB transmits a data packet to the UE M , and the SRN relays only a UE R having a NACK in the 1st Time Zone.
- the SRN uses the same resource allocated to the eNB-UE M.
- the SRN-based dynamic RA is applied to the entire RB (Resource Block).
- the eNB transmits a common RS to the UE M to obtain channel quality indication (CQI) information of a corresponding band assigned to each resource region.
- CQI channel quality indication
- UE M calculates the CQI from the received common RS and delivers the CQI to the eNB through a time point when the corresponding uplink is opened.
- SRN transmits a dedicated RS (Reference Signal) to destination nodes in the eNB-SRN, SRN-UE R for the accurate decoding of the signal, the destination node of each link,
- the CQI may be calculated from the received dedicated RS, and the CQI may be delivered to the source nodes through the time point of opening each uplink.
- FIG. 6 (a) and (b) are diagrams illustrating signal transmission operations in respective time zones of the SRN center of FIG. 5.
- resources are allocated to the eNB-UE M in the 1st time zone so that each eNB transmits signals to UEs to which the eNB belongs.
- the SRN since the SRN is considered to be fixed and the propagation path is excellent, the SRN completely overhears signal transmission from the eNB to the UE.
- the SRN can transmit a signal to the SRN-UE through overhear in the 1st time zone without the link between the eNB-SRN, resource allocation for the eNB-SRN is not performed.
- the signal transmission from the eNB to the UE is still valid in the 2nd time zone, and the signal transmission from the SRN-> UE is valid only when the eNB-> UE is NACK generated.
- the SRN may operate in a cooperative mode and a non-cooperative mode.
- the same resource is used as eNB-> UE, and in the non-cooperative mode, the same resource allocated as the eNB-> UE is used. That is, the basic frame structure as shown in FIG. 5 may be considered.
- FIG. 7 is a diagram illustrating a dynamic RA method of each eNB in an SRN structure to which an embodiment of the present specification can be applied.
- Each eNB considers a structure for dynamically allocating all RBs based on Full Frequency Reuse (FFR), and allocates RBs to UEs through various scheduling techniques (PF, Max CINR, etc.).
- FFR Full Frequency Reuse
- the method in which the RBs do not overlap is referred to as non-overlap or non-cooperative.
- the SRN has no signal transmission to the eNB-UE and only considers the SRN-UE signal transmission.
- the resource overlap or resource cooperative method may transmit the same signal using the same RB to the eNB-UE and the SRN-UE, and may expect diversity gain.
- FIGS. 8 (a) to (c) are diagrams illustrating a case in which a collision occurs because the same RB is allocated to UEs at a cell edge when each eNB uses the Dynamic RA method.
- the region 800 corresponding to the hatched portion represents the region where resources collide with each other. That is, when multiple cells consider the FFR-based dynamic RA method, collisions occur when UEs at the cell edge use the same RB.
- the SRN provides a SRN-based resource reallocation method for ICI avoidance.
- the SRN is geographically located at the center of neighboring eNBs.
- This region where the SRN is located is the cell boundary area of eNBs, where the collision of RB occurs frequently and ICI is strongly influenced by neighboring eNBs. Therefore, the SRN has an advantageous geographical advantage to observe the occurrence of ICI in the center of the region where ICI of several eNBs is strongly operated.
- the SRN is capable of overhearing the signals of all eNBs-UEs.
- the SRN overhears the signals of eNBs-UEs, and can accurately detect the RBs in which collision occurs by using downlink and uplink control signals.
- the first embodiment provides a method in which an SRN overhears a control channel between an eNB and a UE so as to reallocate a resource region directly to a resource region where a collision occurs.
- B and B are angles Index and total number of UEs for
- UEs of the SRN may be classified as follows.
- the index of the RB can be expressed as follows.
- the SINR for each RB can be expressed as follows.
- the SRN uses the parameters to find an RB in which collision occurs in the region of the SRN, and reallocates resources for the collided RB. That is, the resource reallocation method for collision avoidance in this specification can be largely divided into 1) the process of finding the collision RB, and 2) the resource reallocation process for avoiding the collision RB.
- the SRN compares the S C of the SRN, that is, the RBs of the UEs within the coverage of the SRN, to find the RB where the collision occurs.
- RBs are divided into RBs 920 for UEs in the SRN and RBs 910 for UEs outside the SRN.
- the collision RBs 930 are shown.
- the process of finding the collision RB follows the following procedure.
- the UE finds all indexes using the same RB.
- the index k at which collision RB occurs for is specified as a variable of collision_k i (q) and stored as a vector string.
- the second step proposes a method of blocking ICI generation between eNBs in the cell boundary region using the collision RB index obtained in the first step.
- the main method is to exchange the RB where the collision has occurred and the RB outside the SRN region.
- the second step is to follow the steps below.
- each Here is how to remove collision RB for.
- the SRN updates the RB that is replaced by the RA.
- the RB set of S d is a region without ICI, unlike the region of S C.
- FIG. 10 is a diagram illustrating an actual case of a collision RB in an SRN based cell structure according to the first embodiment of the present specification.
- the first step of finding the collision RB may be represented as follows.
- the RB reallocation process through collision RB avoidance is examined through the second process.
- Collision_k 3 (1) 28
- Collision_k 3 (2) 32
- Collision_k 3 (3) 36
- FIG. 11 illustrates a resource reallocation process for collision RB avoidance in an SRN based cell structure according to the first embodiment of the present specification.
- the SIBs of the RBs in which collision has occurred and the RBs of UEs not in the region of the SRN are compared to each eNB, and the RBs having the smallest difference are selected to exchange RBs with each other.
- Black solid line 1100 represents an RB that can be replaced with a Collision RB.
- the second embodiment provides a method of reallocating collision resources by transmitting information for collision avoidance of a resource region allocated to a UE to a base station.
- the SRN may transmit information for preventing resource collision to the eNBs to prevent the eNBs from reallocating the resource to the UEs so that the resource does not collide.
- the information delivered by the SRN to the eNBs is as follows.
- the SRN can identify UEs that are within the coverage of the SRN. Therefore, after identifying the UEs in the SRN, the SRN transfers the IDs of the corresponding UEs to the eNBs.
- SRN overhears downlink and uplink signals transmitted and received between base stations and terminals and transmits IDs for UEs having NACKs (ie, resource collisions) to eNBs.
- NACKs ie, resource collisions
- each eNB that receives the two pieces of information from the SRN exchanges for the RB of the UEs in which the NACK has occurred, thereby preventing resource collision for the UEs.
- the RB to be exchanged is performed in the RB except for the RBs of the UEs in the area of the SRN.
- the third embodiment provides a method in which SRN and eNBs reallocate resources together when a resource collision occurs.
- the third embodiment provides a method in which the SRN partially processes the resource allocation avoidance information and transmits the processed information to each eNB to prevent the ICI, so that each eNB performs resource reallocation.
- a detailed method of the resource reallocation method according to the third embodiment may be performed as follows.
- SRN calculates proportionally the number of UEs in SRN for UEs served by each eNB.
- the SRN transfers the RBs area of the SRN UEs to each eNB by applying the ratio information calculated in (2) as the RB ratio.
- the third embodiment may not only be performed when a resource collision occurs, but also applies to a method in which each eNB allocates resources so that resource collision does not occur without HARQ timing, thereby causing a basic resource allocation to be collided. You can prevent it.
- each eNB may prevent resources from colliding in advance by allocating resources to the UE through the following methods.
- Each eNB receives a cell ID corresponding to each UE in the SRN from the SRN, and uses this to allocate resources to the UEs. Specifically,
- the SRN overhears its Uplink SRS signal and determines the UEs in the SRN. Thereafter, the SRN grasps the cell ID of each UE in the SRN, and then informs the corresponding cells that the UEs are UEs in the SRN. (It is assumed that resources are already statically divided for each cell.)
- the SRN classifies the UEs in the SRN by each cell ID, classifies the UEs in the SRN by the corresponding cell, identifies the number of UEs in the SRN for each cell, and then proportionally applies the entire resource region to apply the corresponding resource ratio. Inform each cell. Through this, each eNB performs resource allocation to the UEs (a method of dynamically classifying resources according to the number of UEs in the SRN).
- FIG. 12 is a diagram illustrating a resource reallocation method for ICI avoidance according to a third embodiment of the present specification.
- RBs for UEs in the SRN region are allocated as shown in FIG. 12 (1210, 1220, 1230).
- the SRN delivers RBs allocated for UEs to each eNB, each eNBs preferentially allocates SRN UEs in the corresponding shadow area, and dynamically allocates all other UEs to the remaining RBs. Assign.
- the SRN may apply the ICI avoidance method in the HARQ timing process as follows.
- SRN is an approach to avoiding ICI alone.
- a SRN and a base station perform an ICI avoidance method together.
- Cases (1) and (2) are classified in terms of subjects performing algorithms for ICI avoidance.
- Cases (3) and (4) are classified in terms of UEs that are algorithm targets for ICI avoidance. will be.
- SRN may perform an uplink HARQ timing process as follows.
- a method of retransmitting an uplink signal with a terminal A method of retransmitting an uplink signal with a terminal.
- Retransmission of an uplink signal is a SRN only or a UE only.
- SRN may perform the HARQ timing process as follows.
- FDD frequency division duplex
- the SRNs share a plurality of (e.g., three) eNBs, ACK or NACK transmitted and received between each eNB and the UE will be distinguished from each other in the following HARQ timing process.
- 13A to 13D illustrate that the IRN occurs when the UEs for each eNB in the cell boundary region all generate ICI, that is, when the ICI occurs because eNB1-UE1, eNB2-UE2, and eNB3-UE3 use the same resources.
- FIG. 13A illustrates an HARQ timing process of performing an ICI avoidance process only for SRN and retransmitting an uplink signal in cooperation with a UE.
- each base station eNB1, eNB2, and eNB3 transmits a physical downlink control channel (PDCCH) to terminals in coverage of each base station in an nth subframe (S1310). That is, eNB1 transmits PDCCH to UE1, eNB2 to UE2, and eNB3 to UE3. In this case, the PDCCH includes an UL grant.
- each base station constitutes one cluster.
- the SRN overhears the PDCCH transmitted from the base station to the terminal in the nth subframe (S1315).
- the SRN demodulates the PDCCH from an n + 1 th subframe to an n + 2 th subframe, and performs an operation for avoiding ICI when a collision of a resource region occurs as a result of the demodulation of the PDCCH ( S1320).
- the operation is shown as "ICIA" in the figure, the operation for avoiding the ICI is as described in Figures 8 to 12.
- the ICI avoidance process may mean that the SRN generates a PDCCH including new resource allocation information for each UE.
- the SRN transmits the updated PDCCH to each eNB by performing the ICI avoidance process (S1325).
- X2 signaling may be used.
- each UE transmits a physical uplink shared channel (PUSCH) to the corresponding eNB (S1330).
- the SRN overhears the PUSCH transmitted by all UEs (S1335).
- the SRN demodulates the punctured PUSCHs from the n + 5th subframe to the n + 6th subframe (S1340).
- the SRN may store the demodulated information PUSCH.
- the SRN transmits whether the demodulation is successfully performed (ACK or NACK) to the eNB (S1345).
- the eNB transmits an updated PDCCH received from the SRN and a response to the received PUSCH to each UE (S1350).
- the response is either an acknowledgment (ACK) or a negative response (NACK). If the cooperative transmission mode of the SRN and the UEs, the NACK signal is transmitted to the UEs.
- the SRN overhears the signal transmitted by each eNB in the n + 8th subframe (S1355).
- the UEs and the SRN cooperatively retransmit the PUSCH signal in the n + 4th subframe in the n + 12th subframe (S1380).
- the eNB transmits an ACK in the n + 16th subframe (S1390).
- FIG. 13B illustrates another embodiment of an HARQ timing process for performing an ICI avoidance process only for SRN and retransmitting an uplink signal in cooperation with a UE.
- Processes from S1310 to S1390 are the same as in FIG. 13A. However, the difference is as follows.
- the SRN demodulates the punctured PUSCHs from the n + 5th subframe to the n + 7th subframe (S1340 ').
- the SRN overhears the signal transmitted by each eNB in the n + 8th subframe (S1355), and transmits its success to each eNB (S1360).
- FIG. 13C illustrates an HARQ timing process in which only the SRN performs an ICI avoidance process and the SRN retransmits an uplink signal non-cooperatively.
- Processes from S1310 to S1355 are the same as in FIG. 13A.
- the UE and the SRN retransmit the signals of the n + 4th subframe together in the n + 12th subframe, but in FIG. 13C, only the SRN retransmits the signal of the n + 4th subframe ( S1380 ').
- the UE In order to operate in the non-cooperative mode as described above, the UE must receive an ACK signal before the n + 8th subframe. However, since the UE performs a fixed transmit / receive operation in a predetermined subframe, it is impossible for the UE to receive an ACK before the n + 8th subframe. Therefore, in the present specification, in order to operate in a non-cooperative mode, an eNB always considers a method of transmitting ACK in n + 8th subframe to UEs regardless of whether the PUSCH is successfully received. The UE that receives the ACK in the n + 8th subframe does not attempt to retransmit in the n + 12th subframe after determining that the eNB has normally received the PUSCH.
- FIG. 13d illustrates an HARQ timing process in which only an SRN is performed for an ICI avoidance process and a terminal retransmits an uplink signal non-cooperatively.
- the non-cooperative HARQ timing process assumes that the link between UE-eNBs in the n + 12th subframe ensures sufficient communication performance using the updated PDCCH in the n + 8th subframe.
- the SRN retransmits the signal
- the UE retransmits the signal.
- the SRN overhears the uplink signal between the UE-eNB, which is located in the interference region between several cells and has a high possibility of interference.
- the SRN since the likelihood that the SRN normally demodulates the uplink signal between UE-eNBs (which is likely to cause interference) is low in the n + 4th subframe, in the case of FIG. 13D, the SRN does not demodulate the PUSCH. .
- the SRN ultimately performs the ICI avoidance operation to ensure retransmission from the UE to the eNB in the n + 12th subframe, and then transmits the updated control information to the eNBs, thereby making the non-cooperative HARQ timing process described in FIG. 15D. Will ensure performance.
- FIG. 14 (a) and (b) are diagrams illustrating a HARQ timing process of an SRN according to another embodiment of the present specification.
- FIG. 14A illustrates an HARQ timing process of performing an ICI avoidance process only for SRN and retransmitting an uplink signal in cooperation with a UE.
- FIG. 14A illustrates that an SCI performs an ICI avoidance process when an ICI occurs between two eNB-UE links in a cell boundary, that is, when an ICI occurs because eNB1-UE1 and eNB2-UE2 use the same resource. It shows how to transmit signals cooperatively with.
- Processes S1410 to S1445 are performed in the same manner as processes S1310 to S1345 of FIG. 13A. However, when eNB3 normally receives the PUSCH and transmits the ACK (S1450), the SRN does not retransmit the PUSCH to the eNB3 in the n + 12th subframe (S1480).
- the eNB3 sends an ACK to the UE3 in the n + 8th subframe in the non-cooperative retransmission mode.
- FIG. 14A since eNB3 normally considers a case where the PUSCH signal is demodulated normally, retransmission of the SRN is not necessary in the n + 12 th subframe.
- eNB3 transmits to the SRN an ACK signal indicating that demodulation of the corresponding PUSCH is normally performed in the n + 9th subframe for the ACK having two meanings, that is, in order to distinguish between normal demodulation of the non-cooperative mode or the PUSCH. (S1470).
- the SRN receives an ACK signal from the eNB3 and does not attempt retransmission from the SRN to the eNB3 in the n + 12th subframe.
- the SRN cooperatively retransmits the PUSCH with the UE2 and the UE3.
- 14b illustrates an HARQ timing process for performing an ICI avoidance process only for SRN and retransmitting an uplink signal in cooperation with a UE.
- 14B illustrates that when ICI occurs between one eNB-UE link in a cell boundary, that is, when only one eNB1 fails to receive a signal normally, SRN performs the above ICI avoidance process with the UE. It shows how to transmit signals cooperatively.
- the eNB ACK signal indicating that the demodulation of the corresponding PUSCH is normally performed by the eNB2 and the eNB3 in the n + 9th subframe is considered. It is transmitted (S1470). Accordingly, the SRN does not attempt to retransmit to the eNB2 and the eNB3 in the n + 12th subframe. In the n + 12th subframe, the SRN retransmits the PUSCH cooperatively with UE1.
- 15A to 15C illustrate that the IRN occurs when all the UEs for each eNB in the cell boundary region have the ICI, that is, when the ICI occurs because eNB1-UE1, eNB2-UE2, and eNB3-UE3 use the same resources.
- FIG. 15A illustrates an HARQ timing process in which an SCI and an eNB perform an ICI avoidance process together and retransmit an uplink signal in cooperation with a UE.
- each base station eNB1, eNB2, and eNB3 transmits a PDCCH to terminals in coverage of each base station in an nth subframe (S1510). That is, eNB1 transmits PDCCH to UE1, eNB2 to UE2, and eNB3 to UE3. In this case, the PDCCH includes an UL grant.
- each base station constitutes one cluster.
- the SRN overhears the PDCCH transmitted by each base station to the terminal in the nth subframe (S1515).
- the SRN demodulates the PDCCH and performs an operation for avoiding ICI (S1520).
- the operation is shown as "ICIA" in the drawing, and operates as described with reference to FIGS.
- the SRN transmits information for collision prevention of the resource region to a base station (second embodiment) or the SRN processes resource allocation information partially and gives each base station information.
- the method (third embodiment) of delivering the processed information can be selected.
- the SRN transmits the updated PDCCH to each eNB by performing the ICI avoidance process (S1525).
- X2 signaling may be used.
- the SRN delivers information for collision avoidance of the resource area allocated to the terminal to the base station, thereby providing a method of reallocating collision resources or processing the resource allocation avoidance information partially by the SRN to prevent ICI, and each eNBs It provides the processed information to each eNB to provide a method for resource allocation. That is, information for operating in the second embodiment or the third embodiment is transmitted to each eNB.
- each UE transmits a PUSCH signal to the corresponding eNB (S1530).
- the SRN overhears the PUSCH signal transmitted by all UEs (S1535).
- the SRN demodulates the punctured PUSCHs from the n + 5th subframe to the n + 6th subframe (S1540).
- the SRN may store the decoded information PUSCH.
- each eNB reallocates a resource region and updates the PDCCH by performing an ICI avoidance process (S1543).
- each eNB demodulates the PUSCH transmitted by the corresponding UE.
- the SRN transmits whether the demodulation is successfully performed (ACK or NACK) from the n + 7th subframe to the corresponding eNB (S1545).
- the eNB transmits an updated PDCCH received from the SRN and a response to the received PUSCH to each UE (S1550).
- the response is either an acknowledgment (ACK) or a negative response (NACK). If the cooperative transmission mode of the SRN and the UEs, the NACK signal is transmitted to the UEs.
- the SRN overhears the signal transmitted by each eNB in the n + 8th subframe (S1555).
- the UEs and the SRN cooperatively retransmit the PUSCH signal in the n + 4th subframe in the n + 12th subframe (S1580).
- the eNB transmits an ACK in the n + 16th subframe (S1590).
- FIG. 15B illustrates another example of an HARQ timing process in which an SCI and an eNB perform an ICI avoidance process together and retransmit an uplink signal in cooperation with a UE.
- the process from S1510 to S1590 is the same as FIG. 15A. However, the difference is as follows.
- the SRN demodulates the punctured PUSCHs from the n + 5th subframe to the n + 7th subframe (S1540 ').
- the SRN overhears the signal transmitted by each eNB in the n + 8th subframe (S1555), and transmits its success to each eNB (S1560).
- FIG. 15C illustrates an HARQ timing process in which an SRN and an eNB perform an ICI avoidance process together and retransmit an uplink signal non-cooperatively.
- the process from S1510 to S1590 is the same as FIG. 15A.
- the UE and the SRN retransmit the PUSCH of the n + 4th subframe together in the n + 12th subframe, but in FIG. 15C, only the UE retransmits the PUSCH of the n + 4th subframe ( S1580 '').
- the SRN does not demodulate the PUSCH overheared in the n + 4th subframe, as described in FIG. 13D.
- FIG. 16 (a) and (b) are diagrams illustrating a HARQ timing process of an SRN according to another embodiment of the present specification.
- FIG. 16a illustrates an HARQ timing process in which an SCI and an eNB perform an ICI avoidance process together and retransmit an uplink signal cooperatively with a UE.
- FIG. 16A illustrates an SCI performing an ICI avoidance process when an ICI occurs between two eNB-UE links in a cell boundary, that is, when an ICI occurs because eNB1-UE1 and eNB2-UE2 use the same resource. It shows how to transmit signals cooperatively with.
- Processes S1610 to S1645 are performed in the same manner as processes S1510 to S1545 of FIG. 15A.
- the SRN does not retransmit the PUSCH to the eNB3 (S1680).
- the eNB3 transmits an ACK signal to the SRN (S1670).
- 16B illustrates an HARQ timing process in which an SCI and an eNB perform an ICI avoidance process together and retransmit an uplink signal cooperatively with a UE.
- FIG. 16B illustrates that when an ICI occurs between one eNB-UE link at a cell boundary, that is, when only one eNB1 fails to receive a signal normally and one NACK signal occurs, the SRN performs the above-described ICI avoidance procedure. It shows how to transmit signals cooperatively.
- the process from S1610 to S1645 is performed in the same manner as the process from S1610 to S1645 in FIG. 16A.
- eNB1 transmits a NACK in step S1650, and thus retransmits the PUSCH only to eNB1 (S1680 ′).
- the eNB2 and the eNB3 since the eNB2 and the eNB3 normally receive the PUSCH, it is considered.
- the eNB2 and the eNB3 inform the SRN that the demodulation of the corresponding PUSCH is normally performed. Is transmitted through X2 signaling (S1670). Accordingly, the SRN does not attempt to retransmit to the eNB2 and the eNB3 in the n + 12th subframe. In the n + 12th subframe, the SRN retransmits the PUSCH cooperatively with the UE only for eNB1.
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Abstract
Description
Claims (16)
- 무선 접속 시스템에서 인접 셀 간 간섭(Inter-Cell Interference:ICI)을 회피하기 위한 릴레이 노드(Relay Node:RN)의 동작 방법에 있어서,n번째 서브 프레임에서, 상기 릴레이 노드를 공유하는 복수의 기지국이 각 기지국의 커버리지 내의 단말들로 전송하는 물리 하향링크 제어 채널(PDCCH)을 엿듣는(overhear) 단계와,상기 PDCCH는 상향링크 그랜트(UL grant)를 포함하며;n+1번째 서브프레임부터 n+2번째 서브 프레임까지 상기 PDCCH를 복조(decoding)하는 단계;상기 복조 결과 자원 영역의 충돌이 발생하는 경우, 상기 PDCCH에서 상기 단말들에게 할당된 자원 영역을 재할당하는 단계;상기 재할당된 자원 영역을 나타내는 제어 정보를 상기 각 기지국으로 전송하는 단계;n+4번째 서브 프레임에서 상기 단말들이 상기 각 기지국으로 전송하는 물리 상향링크 공유 채널(PUSCH)을 엿듣는(overhear) 단계;상기 PUSCH를 복조(decoding)하는 단계; 상기 복조한 결과를 상기 각 기지국으로 전송하는 단계;n+8번째 서브 프레임에서, 상기 각 기지국이 전송하는 상기 PUSCH에 대한 응답 및 상기 재할당된 자원 영역을 반영하여 업데이트된 PDCCH를 엿듣는 단계와, 상기 응답은 긍정 응답(ACK) 또는 부정 응답(NACK)이며; 및n+12번째 서브 프레임에서, 상기 업데이트된 PDCCH에 기초하여, 부정 응답(NACK)을 전송한 기지국에게 n+4번째 서브 프레임에서 전송된 PUSCH를 재전송하는 단계를 포함하여 이루어지는 것을 특징으로 하는 방법.
- 제 1항에 있어서, 상기 제어 정보를 상기 각 기지국으로 전송하는 단계는,상기 하향링크 신호를 통해 상기 릴레이 노드 커버리지 내의 단말들에게 할당되는 자원 영역을 비교하여 충돌이 발생하는 자원 영역이 있는지를 확인하는 단계; 및상기 확인 결과 충돌이 발생하는 자원 영역이 있는 경우, 상기 충돌이 발생하는 자원 영역에 대한 자원 재할당 과정을 수행하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제 2항에 있어서, 상기 자원 재할당 과정을 수행하는 단계는,상기 충돌이 발생하는 자원 영역을 상기 릴레이 노드 커버리지 밖의 단말들에게 할당되는 자원 영역과 교환하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제 3항에 있어서, 상기 자원 영역과 교환하는 단계는,상기 충돌이 발생하는 자원 영역의 신호 대 간섭 및 잡음비(Signal-to-Interference plus Noise Ration:SINR) 값과 상기 릴레이 노드 커버리지 밖의 단말들에게 할당되는 자원 영역의 SINR 값을 각각 비교하는 단계; 및상기 비교 결과, SINR 값의 차이가 가장 작은 자원 영역을 교환할 자원 영역으로 결정하는 단계를 포함하여 이루어지는 것을 특징으로 하는 방법.
- 제 1항에 있어서,상기 복수의 기지국은 3개의 기지국으로 구성되며,상기 릴레이 노드는,상기 3개의 기지국에 의해 공유되는 공유 릴레이 노드(Shared RelayNode:SRN)인 것을 특징으로 하는 방법.
- 제 1항에 있어서, 상기 PUSCH를 복조(decoding)하는 단계 후에,상기 복조의 성공 여부를 상기 각 기지국으로 전송하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 제 1항에 있어서, 상기 n+8번째 서브 프레임에서 상기 기지국들이 전송하는 상기 PUSCH에 대한 응답 및 상기 자원 영역 재할당을 반영하여 업데이트된 PDCCH를 엿듣는 단계 후에,상기 업데이트된 PDCCH를 엿듣는 단계의 성공적 수행 여부를 상기 각 기지국으로 전송하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 제 1항에 있어서, 상기 릴레이 노드는 상기 복수의 기지국과 X2 시그널링을 이용하는 것을 특징으로 하는 방법.
- 제 1항에 있어서, n+8번째 서브 프레임에서 상기 기지국들이 전송하는 상기 PUSCH에 대한 응답은,상기 릴레이 노드가 협력적(cooperaticve) 모드로 동작하는 경우 NACK이고,상기 릴레이 노드가 비협력적(non-cooperaticve) 모드로 동작하는 경우 ACK인 것을 특징으로 하는 방법.
- 무선 접속 시스템에서 인접 셀 간 간섭(Inter-Cell Interference:ICI)을 회피하기 위한 기지국의 동작 방법에 있어서,n번째 서브 프레임에서 상기 기지국의 커버리지 내의 단말로 물리 하향링크 제어 채널(PDCCH)을 전송하는 단계와,상기 PDCCH는 상향링크 그랜트(UL grant)를 포함하며;n+3번째 서브 프레임에서 릴레이 노드(Relay Node:RN)로부터 상기 PDCCH에 대하여 자원 재할당 과정이 필요함을 지시하는 제어 정보를 수신하는 단계;n+4번째 서브 프레임에서 상기 단말로부터 물리 상향링크 공유 채널(PUSCH)을 수신하는 단계;상기 수신한 PUSCH를 복조하는단계;상기 릴레이 노드로부터 수신된 제어 정보에 기초하여, 상기 PDCCH에서 상기 단말에게 할당된 자원 영역을 재할당하는 단계;n+8번째 서브 프레임에서, 상기 PUSCH를 복조한 결과에 대한 응답 및 상기 자원 영역 재할당을 반영하여 업데이트된 PDCCH를 상기 단말로 전송하는 단계와, 상기 응답은 긍정 응답(ACK) 또는 부정 응답(NACK)이며;부정 응답(NACK)을 전송한 경우, n+12번째 서브 프레임에서 상기 업데이트된 PDCCH에 따라, 상기 n+4번째 서브 프레임에서 전송된 PUSCH를 재수신하는 단계를 포함하는 방법.
- 제 10항에 있어서, 상기 n번째 서브프레임에서 할당된 자원 영역을 재할당하는 단계는,상기 하향링크 신호를 통해 상기 릴레이 노드 커버리지 내의 단말들에게 할당되는 자원 영역을 비교하여 충돌이 발생하는 자원 영역이 있는지를 확인하는 단계; 및상기 확인 결과 충돌이 발생하는 자원 영역이 있는 경우, 상기 충돌이 발생하는 자원 영역에 대한 자원 재할당 과정을 수행하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제 11항에 있어서, 상기 자원 재할당 과정을 수행하는 단계는,상기 충돌이 발생하는 자원 영역을 상기 릴레이 노드 커버리지 밖의 단말들에게 할당되는 자원 영역과 교환하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제 12항에 있어서, 상기 자원 영역과 교환하는 단계는,상기 충돌이 발생하는 자원 영역의 신호 대 간섭 및 잡음비(Signal-to-Interference plus Noise Ration:SINR) 값과 상기 릴레이 노드 커버리지 밖의 단말들에게 할당되는 자원 영역의 SINR 값을 각각 비교하는 단계; 및상기 비교 결과, SINR 값의 차이가 가장 작은 자원 영역을 교환할 자원 영역으로 결정하는 단계를 포함하여 이루어지는 것을 특징으로 하는 방법.
- 제 10항에 있어서, 상기 릴레이 노드는,복수의 기지국에 의해 공유되는 공유 릴레이 노드(Shared Relay Node:SRN)인 것을 특징으로 하는 방법.
- 제 10항에 있어서, 상기 수신한 PUSCH를 복조하는 단계 후에,상기 릴레이 노드로부터 상기 PUSCH의 복조 성공 여부를 수신하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 제 10항에 있어서, 상기 n+8번째 서브 프레임에서 상기 PUSCH를 복호한 결과에 대한 응답 및 상기 자원 영역 재할당을 반영하여 업데이트된 PDCCH를 상기 단말로 전송하는 단계 후에,상기 릴레이 노드로부터 상기 응답 및 상기 업데이트된 PDCCH의 수신(overhear)의 성공적 수행 여부를 수신하는 단계를 더 포함하는 것을 특징으로 하는 방법.
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KR101664469B1 (ko) | 2015-02-12 | 2016-10-10 | 서울과학기술대학교 산학협력단 | 전이중 방식 무선 통신망의 단말간 신호 간섭 방지 방법 |
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