WO2013012213A2 - 가변 대역폭을 지원하는 통신 방법 및 무선기기 - Google Patents
가변 대역폭을 지원하는 통신 방법 및 무선기기 Download PDFInfo
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- WO2013012213A2 WO2013012213A2 PCT/KR2012/005578 KR2012005578W WO2013012213A2 WO 2013012213 A2 WO2013012213 A2 WO 2013012213A2 KR 2012005578 W KR2012005578 W KR 2012005578W WO 2013012213 A2 WO2013012213 A2 WO 2013012213A2
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- 238000000034 method Methods 0.000 title claims description 35
- 238000004891 communication Methods 0.000 title claims description 24
- 230000004044 response Effects 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 description 17
- 230000002776 aggregation Effects 0.000 description 9
- 238000004220 aggregation Methods 0.000 description 9
- 238000013468 resource allocation Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 230000011664 signaling Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 125000004122 cyclic group Chemical group 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
-
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
Definitions
- the present invention relates to wireless communication, and more particularly, to a communication method for supporting variable bandwidth in a wireless communication system and a wireless device using the same.
- LTE Long term evolution
- 3GPP 3rd Generation Partnership Project
- TS Technical Specification
- Next-generation wireless communication systems are considering providing services for low- and low-end devices that focus on data communication, such as meter reading, water level measurement, surveillance camera use, and vending machine inventory reporting.
- MTC machine-type communication
- MTC refers to a concept in which a mechanical device, not a terminal used by humans, communicates using an existing wireless communication network.
- the mechanical device used for the MTC is called an MTC device or an M2M device.
- the MTC service Since the MTC service has a small amount of data to be transmitted and occasional transmission and reception of data, it is efficient to lower the unit cost and reduce battery consumption at low data rates. For example, if the operating bandwidth of the MTC device is smaller than that of the existing mobile terminal, the RF (radio frequency) baseband complexity of the MTC device can be greatly reduced.
- LTE / LTE-A system supports various bandwidths such as 20MHz, 10MHz or 5MHz, but cannot support wireless devices that support multiple bandwidths.
- One base station or network system supports only one bandwidth. For example, if a base station supports 20 MHz bandwidth, only a wireless device supporting 20 MHz bandwidth can access the base station.
- wireless devices supporting narrow bands such as MTC devices may be disposed in the coverage of the base station.
- a device having a 5 MHz bandwidth cannot be connected to a base station having a 20 MHz bandwidth.
- the present invention provides a communication method supporting various bandwidths and a wireless device using the same.
- a communication method that supports variable bandwidth in a wireless communication system.
- the method includes the wireless device transmitting a random access preamble indicating an operating bandwidth to a base station supporting a basic bandwidth, and the wireless device receiving a random access response from the base station in response to the random access preamble.
- the operating bandwidth is less than the basic bandwidth.
- a plurality of candidate random access preambles are divided into a first group and a second group, wherein the first group indicates the basic bandwidth, the second group indicates the operating bandwidth, and the random access preamble indicates the second group. Can be randomly selected from among candidate random access preambles.
- the operating bandwidth may be indicated according to a resource for transmitting the random access preamble.
- a wireless device supporting a variable bandwidth in a wireless communication system includes an RF (radio freqeuncy) unit for transmitting and receiving a radio signal and a processor connected to the RF unit, the processor is a base station that supports the basic bandwidth Transmit a random access preamble indicating an operating bandwidth, and receive a random access response from the base station in response to the random access preamble, wherein the operating bandwidth is smaller than the basic bandwidth.
- RF radio freqeuncy
- the base station may provide services to wireless devices having various bandwidths.
- 1 shows a structure of a downlink radio frame in 3GPP LTE-A.
- FIG. 2 shows a structure of an uplink subframe in 3GPP LTE-A.
- 3 is an exemplary diagram illustrating monitoring of a PDCCH.
- FIG. 4 shows an example in which a reference signal and a control channel are arranged in a DL subframe.
- 5 is an example of a subframe having an extended PDCCH.
- FIG. 6 is a flowchart illustrating a random access procedure according to the prior art.
- FIG. 7 illustrates a random access procedure according to an embodiment of the present invention.
- FIG. 10 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- a wireless device may be fixed or mobile, and a user equipment (UE) may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), or a wireless device. ), A personal digital assistant (PDA), a wireless modem, a handheld device, or other terms.
- the wireless device may be a device that supports only data communication, such as a machine-type communication (MTC) device.
- MTC machine-type communication
- a base station generally refers to a fixed station that communicates with a wireless device.
- the base station BS may be referred to in other terms, such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point. have.
- eNB evolved-NodeB
- BTS base transceiver system
- access point an access point
- the present invention is applied based on 3GPP long term evolution (LTE) based on 3rd Generation Partnership Project (3GPP) Technical Specification (TS) Release 8 or 3GPP LTE-A based on 3GPP TS Release 10. Describe what happens.
- LTE long term evolution
- 3GPP 3rd Generation Partnership Project
- TS Technical Specification
- the wireless device may be served by a plurality of serving cells.
- Each serving cell may be defined as a downlink (DL) component carrier (CC) or a pair of DL CC and UL (uplink) CC.
- DL downlink
- CC downlink component carrier
- uplink uplink
- the serving cell may be divided into a primary cell and a secondary cell.
- the primary cell is a cell that operates at the primary frequency, performs an initial connection establishment process, initiates a connection reestablishment process, or is designated as a primary cell in a handover process.
- the primary cell is also called a reference cell.
- the secondary cell operates at the secondary frequency, may be established after a Radio Resource Control (RRC) connection is established, and may be used to provide additional radio resources.
- RRC Radio Resource Control
- At least one primary cell is always configured, and the secondary cell may be added / modified / released by higher layer signaling (eg, radio resource control (RRC) message).
- RRC Radio Resource Control
- the cell index (CI) of the primary cell may be fixed.
- the lowest CI may be designated as the CI of the primary cell.
- the CI of the primary cell is 0, and the CI of the secondary cell is sequentially assigned from 1.
- 3GPP LTE-A shows a structure of a downlink radio frame in 3GPP LTE-A. It may be referred to section 6 of 3GPP TS 36.211 V10.2.0 (2011-06) "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10)".
- E-UTRA Evolved Universal Terrestrial Radio Access
- R-UTRA Physical Channels and Modulation
- the radio frame includes 10 subframes indexed from 0 to 9.
- One subframe includes two consecutive slots.
- the time it takes for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
- One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain.
- OFDM symbol is only for representing one symbol period in the time domain, since 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink (DL), multiple access scheme or name There is no limit on.
- OFDM symbol may be called another name such as a single carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, and the like.
- SC-FDMA single carrier-frequency division multiple access
- One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP).
- CP cyclic prefix
- a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
- the DL (downlink) subframe is divided into a control region and a data region in the time domain.
- the control region includes up to four OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
- a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
- PDCH physical downlink control channel
- FIG. 2 shows a structure of an uplink subframe in 3GPP LTE-A.
- the UL subframe may be divided into a control region in which a physical uplink control channel (PUCCH) carrying uplink control information is allocated in a frequency domain and a data region in which a physical uplink shared channel (PUSCH) carrying user data is allocated.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- PUCCH is allocated to an RB pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the first slot and the second slot.
- m is a position index indicating a logical frequency domain position of an RB pair allocated to a PUCCH in a subframe. It is shown that an RB having the same m value occupies different subcarriers in two slots.
- physical control channels in 3GPP LTE / LTE-A include a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid-ARQ indicator channel (PHICH). .
- PDCCH physical downlink control channel
- PCFICH physical control format indicator channel
- PHICH physical hybrid-ARQ indicator channel
- the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
- CFI control format indicator
- the terminal first receives the CFI on the PCFICH, and then monitors the PDCCH.
- the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.
- the PHICH carries a positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal for an uplink hybrid automatic repeat request (HARQ).
- ACK positive-acknowledgement
- NACK negative-acknowledgement
- HARQ uplink hybrid automatic repeat request
- the ACK / NACK signal for uplink (UL) data on the PUSCH transmitted by the UE is transmitted on the PHICH.
- the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame.
- the PBCH carries system information necessary for the terminal to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
- MIB master information block
- SIB system information block
- DCI downlink control information
- PDSCH also called DL grant
- PUSCH resource allocation also called UL grant
- VoIP Voice over Internet Protocol
- blind decoding is used to detect the PDCCH.
- Blind decoding is a method of demasking a desired identifier in a CRC of a received PDCCH (which is called a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
- the base station determines the PDCCH format according to the DCI to be sent to the terminal, attaches a cyclic redundancy check (CRC) to the DCI, and unique identifier according to the owner or purpose of the PDCCH (this is called a Radio Network Temporary Identifier) Mask to the CRC.
- CRC cyclic redundancy check
- the control region in the subframe includes a plurality of control channel elements (CCEs).
- the CCE is a logical allocation unit used to provide a coding rate according to the state of a radio channel to a PDCCH and corresponds to a plurality of resource element groups (REGs).
- the REG includes a plurality of resource elements.
- the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
- One REG includes four REs and one CCE includes nine REGs.
- ⁇ 1, 2, 4, 8 ⁇ CCEs may be used to configure one PDCCH, and each element of ⁇ 1, 2, 4, 8 ⁇ is called a CCE aggregation level.
- the number of CCEs used for transmission of the PDDCH is determined by the base station according to the channel state. For example, one CCE may be used for PDCCH transmission for a UE having a good downlink channel state. Eight CCEs may be used for PDCCH transmission for a UE having a poor downlink channel state.
- a control channel composed of one or more CCEs performs interleaving in units of REGs and is mapped to physical resources after a cyclic shift based on a cell ID.
- 3 is an exemplary diagram illustrating monitoring of a PDCCH. This may be referred to in section 9 of 3GPP TS 36.213 V10.2.0 (2011-06).
- blind decoding is used to detect the PDCCH.
- Blind decoding is a method of demasking a desired identifier in a CRC of a received PDCCH (which is called a PDCCH candidate), and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
- the UE does not know where its PDCCH is transmitted using which CCE aggregation level or DCI format at which position in the control region.
- a plurality of PDCCHs may be transmitted in one subframe.
- the UE monitors the plurality of PDCCHs in every subframe.
- the monitoring means that the UE attempts to decode the PDCCH according to the monitored PDCCH format.
- a search space is used to reduce the burden of blind decoding.
- the search space may be referred to as a monitoring set of the CCE for the PDCCH.
- the UE monitors the PDCCH in the corresponding search space.
- the search space is divided into a common search space and a UE-specific search space.
- the common search space is a space for searching for a PDCCH having common control information.
- the common search space includes 16 CCEs up to CCE indexes 0 to 15 and supports a PDCCH having a CCE aggregation level of ⁇ 4, 8 ⁇ .
- PDCCHs (DCI formats 0 and 1A) carrying UE specific information may also be transmitted in the common search space.
- the UE-specific search space supports a PDCCH having a CCE aggregation level of ⁇ 1, 2, 4, 8 ⁇ .
- Table 1 below shows the number of PDCCH candidates monitored by the UE.
- the size of the search space is determined by Table 1, and the starting point of the search space is defined differently from the common search space and the terminal specific search space.
- the starting point of the common search space is fixed irrespective of the subframe, but the starting point of the UE-specific search space is for each subframe according to the terminal identifier (eg, C-RNTI), the CCE aggregation level and / or the slot number in the radio frame. Can vary.
- the terminal specific search space and the common search space may overlap.
- the search space S (L) k is defined as a set of PDCCH candidates at a set level L ⁇ ⁇ 1,2,3,4 ⁇ .
- the CCE corresponding to the PDCCH candidate m in the search space S (L) k is given as follows.
- N CCE, k can be used to transmit the PDCCH in the control region of subframe k.
- the control region includes a set of CCEs numbered from 0 to N CCE, k ⁇ 1.
- M (L) is the number of PDCCH candidates at CCE aggregation level L in a given search space.
- variable Y k is defined as follows.
- n s is a slot number in a radio frame.
- transmission of a DL transport block is performed by a pair of PDCCH and PDSCH.
- Transmission of the UL transport block is performed by a pair of PDCCH and PUSCH.
- the terminal receives a DL transport block on the PDSCH indicated by the PDCCH.
- the UE monitors the PDCCH in the DL subframe and receives the DL resource allocation on the PDCCH.
- the terminal receives a DL transport block on the PDSCH indicated by the DL resource allocation.
- FIG. 4 shows an example in which a reference signal and a control channel are arranged in a DL subframe.
- the control region includes the preceding three OFDM symbols, and the data region in which the PDSCH is transmitted includes the remaining OFDM symbols.
- PCFICH, PHICH and / or PDCCH are transmitted in the control region.
- the CFI of the PCFICH indicates three OFDM symbols.
- the region excluding the resource for transmitting the PCFICH and / or PHICH becomes the PDCCH region for monitoring the PDCCH.
- the CRS (cell-specific reference signal) can be received by all terminals in the cell, and is transmitted over the entire downlink band.
- 'R0' is a resource element (RE) through which the CRS for the first antenna port is transmitted
- 'R1' is a RE through which the CRS is transmitted for the second antenna port
- 'R2' is a CRS for the third antenna port. Is transmitted, 'R3' indicates the RE is transmitted CRS for the fourth antenna port.
- RS sequence r l, ns (m) for CRS is defined as follows.
- N maxRB is the maximum number of RBs
- ns is a slot number in a radio frame
- l is an OFDM symbol number in a slot.
- the pseudo-random sequence c (i) is defined by a Gold sequence of length 31 as follows.
- Nc 1600
- N cell ID is a physical cell identity (PCI) of a cell
- N CP 1 in a normal CP
- N CP 0 in an extended CP.
- a UE-specific reference signal is transmitted in the subframe.
- the CRS is transmitted in the entire region of the subframe
- the URS is transmitted in the data region of the subframe and used for demodulation of the corresponding PDSCH.
- 'R5' indicates the RE to which the URS is transmitted.
- URS is also referred to as a dedicated reference signal (DRS) or a demodulation reference signal (DM-RS).
- DRS dedicated reference signal
- DM-RS demodulation reference signal
- the URS is transmitted only in the RB to which the corresponding PDSCH is mapped.
- R5 is displayed in addition to the region in which the PDSCH is transmitted, but this is to indicate the location of the RE to which the URS is mapped.
- URS is used only by a terminal receiving a corresponding PDSCH.
- RS sequence r ns (m) for US is the same as Equation (3).
- m 0, 1, ..., 12 N PDSCH, RB -1, N PDSCH, RB is the number of RB of the corresponding PDSCH transmission.
- n RNTI is a terminal identifier.
- n SCID is a parameter obtained from a DL grant (eg, DCI format 2B or 2C) associated with PDSCH transmission.
- 5 is an example of a subframe having an extended PDCCH.
- ePDCCH is also called enhanced-PDCCH.
- the subframe includes a PDCCH region 410 for monitoring the PDCCH and one or more ePDCCH regions 420, 430 for which the ePDDCH is monitored.
- the PDCCH region 410 is located in up to four OFDM symbols in advance of the subframe, but the ePDCCH regions 420 and 430 can be flexibly scheduled in the data region.
- the PDCCH may be demodulated based on the CRS.
- the ePDCCH regions 420 and 430 may demodulate the ePDCCH based on the URS.
- the URS may be transmitted in the corresponding ePDCCH regions 420 and 430.
- the ePDCCH regions 420 and 430 may use blind decoding to monitor the ePDDCH. Or, the ePDCCH may not use blind decoding.
- the UE may know the position or number of the ePDCCH in the ePDCCH regions 420 and 430 in advance, and detect the ePDCCH at a designated position.
- the ePDCCH regions 420 and 430 may be monitored by one terminal, a group of terminals, or terminals within a cell. If a specific terminal monitors the ePDCCH regions 420 and 430, n RNTI or n SCID used for initialization of the pseudo random sequence generator of the URS may be obtained based on the identifier of the specific terminal. If the group of the UE monitors the ePDCCH regions 420 and 430, n RNTI or n SCID used to initialize the pseudo random sequence generator of the URS may be obtained based on an identifier of the corresponding UE group.
- the same precoding as the URS may be applied to the ePDCCH regions 420 and 430.
- the random access procedure is used for a wireless device to obtain UL synchronization with a base station or to be allocated UL radio resources.
- the wireless device receives a root index and a physical random access channel (PRACH) configuration index from the base station.
- Each cell has 64 candidate random access preambles defined by a Zadoff-Chu (ZC) sequence, and the root index is a logical index for the wireless device to generate 64 candidate random access preambles.
- ZC Zadoff-Chu
- the PRACH configuration index indicates a specific subframe and a preamble format capable of transmitting the random access preamble.
- the wireless device transmits a randomly selected random access preamble to the base station (S110).
- the wireless device selects one of the 64 candidate random access preambles. Then, the corresponding subframe is selected by the PRACH configuration index.
- the wireless device transmits the selected random access preamble in the selected subframe.
- the base station receiving the random access preamble sends a random access response (RAR) to the wireless device (S120).
- RAR random access response
- the random access response is detected in two steps. First, the wireless device detects a PDCCH masked with a random access-RNTI (RA-RNTI). A random access response in a medium access control (MAC) protocol data unit (PDU) is received on the PDSCH indicated by the DL grant on the detected PDCCH.
- MAC medium access control
- the random access response may include a timing advance command (TAC), a UL grant, and a temporary C-RNTI.
- TAC is information indicating a time synchronization value that the base station sends to the wireless device to maintain UL time alignment.
- the wireless device updates the UL transmission timing by using the time synchronization value.
- the wireless device starts or restarts a time alignment timer. Only when the time synchronization timer is running can the wireless device transmit UL.
- the wireless device transmits the scheduled message to the base station according to the UL grant in the random access response (S130).
- the random access preamble is also referred to as an M1 message, a random access response as an M2 message, and a scheduled message as an M3 message.
- the wireless device may inform the base station of a bandwidth capability regarding an operating bandwidth supported by the wireless device.
- the operating bandwidth may mean one or more bandwidths or maximum bandwidths at which the wireless device can operate.
- the bandwidth capability may include at least one of the following.
- the bandwidth basically supported by the base station is referred to as a reference bandwidth.
- the operating bandwidth of the wireless device is less than the default bandwidth.
- the basic bandwidth may be any one of 20 MHz, 10 MHz, and 5 MHz.
- the operating bandwidth may be any of 5 MHz, 3 MHz and 1.4 MHz.
- the unit of bandwidth may be expressed in MHz, but this is merely an example and may be expressed in various units representing a frequency domain such as the number of RBs and the number of subcarriers.
- a random access procedure is used to inform the base station of information about an operating bandwidth of the wireless device.
- the wireless device transmits a random access preamble indicating the operating bandwidth to the base station (S210).
- the random access preamble may be transmitted based on the basic bandwidth.
- a random access preamble may be specified according to the operating bandwidth.
- the 64 candidate random access preambles may be divided into two or more groups, and each group may be used according to an operating bandwidth.
- the first group may be used by a wireless device using a basic bandwidth
- the second group may be used by a wireless device using a narrow bandwidth operating bandwidth.
- the plurality of groups may be changed according to a predetermined rule according to time or frequency.
- the resource (subframe, RB location, etc.) to which the random access preamble is transmitted may be designated according to the operating bandwidth.
- the PRACH configuration indexes of Table 2 0 through 5 may be used by a wireless device using a basic bandwidth, and the PRACH configuration index 6 may be used by a wireless device using a narrow bandwidth operating bandwidth.
- a specific RB or a specific subframe may be used to indicate the operating bandwidth in the PRACH configuration.
- PRACH configuration index 6 is set.
- the wireless device using the basic bandwidth may transmit a random access preamble in a subframe having subframe numbers 1 and / or 6.
- the wireless device using the operating bandwidth may transmit the random access preamble only in the subframe having the subframe number 6.
- the random access preamble may be transmitted in a specific RB indicating the operating bandwidth.
- the resource indicating the operating bandwidth may change with a predetermined rule over time.
- the wireless device receives a random access response from the base station (S220).
- the random access response may include information that allows or denies the use of operating bandwidth.
- the wireless device may transmit the scheduled message based on the UL grant of the random access response.
- the scheduled message may include information regarding the bandwidth capability of the wireless device.
- the wireless device may inform that it is using a narrow bandwidth operating bandwidth through the random access preamble, and transmit more specific information (for example, size or location of the operating bandwidth) through a scheduled message or an RRC message.
- specific information for example, size or location of the operating bandwidth
- Information indicating the operating bandwidth of the wireless device may be included in a message on the PUSCH or transmitted through CRC scrambling, bit scramble, or the like.
- the wireless device may transmit the information about the bandwidth capability to the base station during the initial access process and connection reestablishment with the base station.
- the operating bandwidth may be independent of DL operation and UL operation.
- the wireless device may inform the base station of at least one of a DL operating bandwidth and a UL operating bandwidth. Since the UL bandwidth limit is easier than the DL bandwidth limit, only the UL operating bandwidth can be informed.
- the wireless device may use a basic bandwidth for DL communication and an operating bandwidth for UL communication.
- a wireless device operating in a narrow bandwidth operating bandwidth may perform PDCCH / PDSCH / PUSCH scheduling only in a part of the wide bandwidth.
- This band limitation may be applied to all subframes or only specific subframes.
- the subframe to which the operating bandwidth is applied (hereinafter referred to as an operation subframe) may be designated in advance, or the base station may inform the wireless device through RRC signaling.
- a wireless device may monitor a PDCCH in a basic bandwidth in a subframe in which system information (eg, SIB-1) is transmitted or in a subframe in which a paging message is transmitted.
- the wireless device may monitor the PDCCH at the basic bandwidth during the initial connection.
- the base station can inform the wireless device of information about the size of the PDCCH region (eg, the number of OFDM symbols for the PDCCH region) or the position of the OFDM symbol at which the PDSCH transmission is started.
- a PDCCH region may not be defined in an operation subframe to which an operation bandwidth is applied. That is, the PDSCH may be transmitted in the first OFDM symbol of the subframe.
- Each wireless device may be allocated a different band independently from the basic bandwidth as the operating bandwidth.
- the PDCCH of 3GPP LTE / LTE-A is transmitted in a distributed system band. Accordingly, there is a problem that a wireless device operating at an operating bandwidth cannot receive an existing PDCCH.
- DL / UL scheduling and other control signaling of a wireless device operating at an operating bandwidth may be performed through the ePDCCH.
- the operating bandwidth of the wireless device is 6 RB, and the ePDCCH region for the wireless device is defined within 6 RB.
- the wireless device may monitor the ePDCCH in the ePDCCH region.
- Resource allocation on the ePDCCH may be defined based on the RB in the operating bandwidth. For example, if the DL operating bandwidth is 6 RBs, the DL resource allocation may include a 6 bit bitmap corresponding to 6 RBs. For example, if the bitmap is '100100', this indicates that the first RB and the fourth RB are allocated to the PDSCH transmission.
- the base station can inform the wireless device of the size or location of the DL / UL operating bandwidth to operate the wireless device.
- the operating bandwidth can be used for reception of both PDCCH / PDSCH.
- the reception of the PDCCH may be performed in the basic bandwidth, and the reception of the PDSCH may be performed in the operating bandwidth.
- the operating bandwidth can be limited to the reception of data traffic.
- System information refers to information necessary for the wireless device to communicate with the base station.
- system information is transmitted through a scheduled PDSCH on a PDCCH.
- the wireless device operating in the operating bandwidth cannot receive the PDCCH transmitted over the basic bandwidth, there is a need for a method for the wireless device to receive system information.
- the base station may transmit system information through a PDSCH transmitted through RBs within a specific band for wireless devices operating at an operating bandwidth. That is, system information is transmitted over a basic bandwidth, and the same system information is transmitted over a narrow band.
- the PDSCH carrying system information may be scheduled on an ePDCCH within an operating bandwidth, or transmitted on a predetermined subframe and / or RB without an ePDCCH.
- the ePDDCH may be monitored in an ePDCCH region common to a plurality of wireless devices.
- PUCCH is used for transmission of HARQ ACK / NACK, channel status indication (CSI), and scheduling request (SR). As shown in FIG. 2, PUCCHs are sequentially allocated inward from the outermost RB of the basic bandwidth.
- the wireless device may not transmit the PUCCH.
- the PUCCH starting point may be defined for each radio.
- the PUCCH starting point may be delivered through RRC signaling.
- the PUCCH starting point indicates the RB where the PUCCH starts to be allocated. If the operating bandwidth is defined as 6 RBs of indexes 10-15, the PUCCH starting point may point to RB of index 10 and / or RB of index 15.
- the PUCCH starting point may be given as an offset from the lowest (or highest) RB index of the basic bandwidth.
- PUCCH resources within the PUCCH starting point or UL operating bandwidth may be associated with the resources of the corresponding ePDCCH.
- a wireless device that receives a PDSCH indicated by ePDCCH candidate 1 may transmit an ACK / NACK for the PDSCH using a PUCCH resource corresponding to the ePDCCH candidate 1.
- Only one RB may be allocated for the PUCCH in the operating bandwidth. In this case, the same RB may be used for PUCCH transmission in two slots.
- Information related to the PUCCH starting point may be delivered to the wireless device through RRC signaling.
- FIG. 10 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- the base station 50 includes a processor 51, a memory 52, and an RF unit 53.
- the memory 52 is connected to the processor 51 and stores various information for driving the processor 51.
- the RF unit 53 is connected to the processor 51 and transmits and / or receives a radio signal.
- the processor 51 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 51.
- the wireless device 60 includes a processor 61, a memory 62, and an RF unit 63.
- the memory 62 is connected to the processor 61 and stores various information for driving the processor 61.
- the RF unit 63 is connected to the processor 61 and transmits and / or receives a radio signal.
- the processor 61 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the wireless device may be implemented by the processor 61.
- the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
- the RF unit may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
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Abstract
Description
Search Space Type | Aggregation level L | Size [in CCEs] | Number of PDCCH candidates | DCI formats |
UE-specific | 1 | 6 | 6 | 0, 1, 1A,1B,1D, 2, 2A |
2 | 12 | 6 | ||
4 | 8 | 2 | ||
8 | 16 | 2 | ||
Common | 4 | 16 | 4 | 0, 1A, 1C, 3/3A |
8 | 16 | 2 |
PRACH 설정 인덱스 | 프리앰블 포맷 | 시스템 프레임 번호 | 서브프레임 번호 |
0 | 0 | Even | 1 |
1 | 0 | Even | 4 |
2 | 0 | Even | 7 |
3 | 0 | Any | 1 |
4 | 0 | Any | 4 |
5 | 0 | Any | 7 |
6 | 0 | Any | 1, 6 |
Claims (13)
- 무선 통신 시스템에서 가변 대역폭을 지원하는 통신 방법에 있어서,무선기기가 기본 대역폭을 지원하는 기지국으로 동작 대역폭을 지시하는 랜덤 액세스 프리앰블을 전송하고, 및상기 무선기기가 상기 기지국으로부터 상기 랜덤 액세스 프리앰블에 대한 응답으로 랜덤 액세스 응답을 수신하는 것을 포함하되,상기 동작 대역폭은 상기 기본 대역폭보다 작은 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서,복수의 후보 랜덤 액세스 프리앰블은 제1 그룹과 제2 그룹으로 나뉘고, 상기 제1 그룹은 상기 기본 대역폭을 지시하고, 상기 제2 그룹은 상기 동작 대역폭을 지시하며,상기 랜덤 액세스 프리앰블은 상기 제2 그룹 내의 후보 랜덤 액세스 프리앰블들 중에서 랜덤하게 선택되는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서,상기 랜덤 액세스 프리앰블이 전송되는 자원에 따라 상기 동작 대역폭이 지시되는 것을 특징으로 하는 통신 방법.
- 제 3 항에 있어서, 상기 자원은 서브프레임인 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 기본 대역폭에서 데이터 채널을 스케줄링하는 제어채널을 수신하고,상기 동작 대역폭에서 상기 데이터 채널을 수신하는 것을 더 포함하는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서,상기 동작 대역폭에서 데이터 채널을 스케줄링하는 제어채널 수신하고,상기 동작 대역폭에서 상기 데이터 채널을 수신하는 것을 더 포함하는 것을 특징으로 하는 통신 방법.
- 제 6 항에 있어서, 상기 제어채널은 상기 데이터 채널과 동일한 기준신호를 사용하는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 랜덤 액세스 응답은 상기 동작 대역폭의 사용을 승인하는 정보를 포함하는 것을 특징으로 하는 통신 방법.
- 무선 통신 시스템에서 가변 대역폭을 지원하는 무선기기에 있어서,무선 신호를 송신 및 수신하는 RF(radio freqeuncy)부; 및상기 RF부와 연결되는 프로세서를 포함하되, 상기 프로세서는기본 대역폭을 지원하는 기지국으로 동작 대역폭을 지시하는 랜덤 액세스 프리앰블을 전송하고, 및상기 기지국으로부터 상기 랜덤 액세스 프리앰블에 대한 응답으로 랜덤 액세스 응답을 수신하되,상기 동작 대역폭은 상기 기본 대역폭보다 작은 것을 특징으로 하는 무선기기.
- 제 9 항에 있어서,복수의 후보 랜덤 액세스 프리앰블은 제1 그룹과 제2 그룹으로 나뉘고, 상기 제1 그룹은 상기 기본 대역폭을 지시하고, 상기 제2 그룹은 상기 동작 대역폭을 지시하며,상기 랜덤 액세스 프리앰블은 상기 제2 그룹 내의 후보 랜덤 액세스 프리앰블들 중에서 랜덤하게 선택되는 것을 특징으로 하는 무선기기.
- 제 9 항에 있어서,상기 랜덤 액세스 프리앰블이 전송되는 자원에 따라 상기 동작 대역폭이 지시되는 것을 특징으로 하는 무선기기.
- 제 9 항에 있어서, 상기 프로세서는상기 기본 대역폭에서 데이터 채널을 스케줄링하는 제어채널을 수신하고, 상기 동작 대역폭에서 상기 데이터 채널을 수신하는 것을 특징으로 하는 무선기기.
- 제 9 항에 있어서, 상기 프로세서는상기 동작 대역폭에서 데이터 채널을 스케줄링하는 제어채널을 수신하고, 상기 동작 대역폭에서 상기 데이터 채널을 수신하는 것을 특징으로 하는 무선기기.
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US14/130,638 US20140133433A1 (en) | 2011-07-15 | 2012-07-13 | Communication method and wireless device supporting variable bandwidth |
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Also Published As
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KR20140010158A (ko) | 2014-01-23 |
KR101480259B1 (ko) | 2015-01-08 |
US20140133433A1 (en) | 2014-05-15 |
WO2013012213A3 (ko) | 2013-04-11 |
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