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WO2017052026A1 - Procédé pour accéder à une cellule à onde millimétrique dans un système de communication sans fil et dispositif associé - Google Patents

Procédé pour accéder à une cellule à onde millimétrique dans un système de communication sans fil et dispositif associé Download PDF

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Publication number
WO2017052026A1
WO2017052026A1 PCT/KR2016/005431 KR2016005431W WO2017052026A1 WO 2017052026 A1 WO2017052026 A1 WO 2017052026A1 KR 2016005431 W KR2016005431 W KR 2016005431W WO 2017052026 A1 WO2017052026 A1 WO 2017052026A1
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Prior art keywords
mmwave
terminal
millimeter wave
random access
estimated
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English (en)
Korean (ko)
Inventor
최국헌
강지원
고현수
노광석
김동규
이상림
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LG Electronics Inc
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LG Electronics Inc
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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
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a wireless communication system, and to a method and apparatus for performing a random access to a millimeter wave (mmWave: millimeter wave) cell by a millimeter wave terminal.
  • mmWave millimeter wave
  • Wireless access systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless access system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • An object of the present invention is to provide a method and apparatus for efficiently accessing a millimeter wave cell by a terminal connected to a legacy cell.
  • a terminal of a wireless communication system supporting a millimeter wave (mmWave) for achieving the above technical problem, scanning a plurality of millimeter wave beams sequentially formed in different directions, the scanning A processor for estimating the ID of the millimeter wave beam to which the terminal belongs according to a result; And a transmitter for transmitting a random access preamble to a millimeter wave cell, wherein the random access preamble is transmitted through a terminal-specific resource region determined based on an ID of the estimated millimeter wave beam and an identifier of the terminal. .
  • the random access preamble may be transmitted at a timing corresponding to the ID of the estimated millimeter wave beam among a plurality of random access timings.
  • the terminal-specific resource region is, And 'k' is an identifier of the terminal, ' 'Is the ID of the estimated millimeter wave beam,' f beam , k ( ) ' May indicate a resource region specific to the estimated millimeter wave beam ID,' i, j 'may indicate a time and frequency index, and' offset i, j (k) 'may indicate a resource offset specific to the terminal.
  • the sequence of random access preambles may be generated based on an index of a logical root zadoff-chu sequence specific to the ID of the estimated millimeter wave beam. More preferably, the index of the logical root Zadoff-Chu sequence corresponds to ' ⁇ mod Nzc', ' ⁇ ' is the ID of the estimated millimeter wave beam, and 'Nzc' is the length of the Zadov-Chu sequence. Can be represented.
  • 'Is the length of the Zadoff-Chu sequence, and' Ncs' may represent a cyclic shift constant given according to the preamble format.
  • the terminal may receive a System Information Block (SIB) including information on random access timing for each beam ID.
  • SIB System Information Block
  • the preamble and resource for the random access in the millimeter wave cell are determined specifically to the ID of the beam and the identifier of the terminal, thereby minimizing collision between random access preambles and efficiently accessing random access. Can be performed.
  • 1A illustrates a random access procedure of an LTE system.
  • 1B illustrates the DMTC of an LTE system.
  • FIG 2 illustrates an initial stage of receive beam scanning for transmit beam scanning according to an embodiment of the present invention.
  • FIG 3 illustrates a method of performing beam scanning at a transmitting end after a receiving lobe index is fixed at a receiving side according to an embodiment of the present invention.
  • FIG. 4 illustrates a structure of a random access preamble repeated according to a beam direction according to an embodiment of the present invention.
  • 5 illustrates the use of a new type of PRACH preamble in accordance with an embodiment of the present invention.
  • FIG. 6 illustrates the use of a new type of PRACH preamble in accordance with another embodiment of the present invention.
  • FIG. 7 illustrates a distribution of mmWave cells in accordance with an embodiment of the present invention.
  • FIG. 8 illustrates an mmWave frame structure according to an embodiment of the present invention.
  • FIG 9 illustrates mmWave DMTC period and DMTC length settings according to an embodiment of the present invention.
  • FIG. 10 illustrates mmWave DMTC setup according to another embodiment of the present invention.
  • FIG. 11 illustrates an mmWave TAG and an Xn interface according to an embodiment of the present invention.
  • FIG. 12 illustrates setting of mmWave TAG and discovery discovery signal according to mmWave terminal position.
  • FIG. 13 illustrates a timing setting for transmitting an mmWave discovery signal in a cell of mmWave TAG according to an embodiment of the present invention.
  • FIG. 14 is a diagram for describing a method of determining a beam direction by performing autocorrelation according to an embodiment of the present invention.
  • FIG. 15 illustrates a transmission start point of mmWave data according to detection of an mmWave discovery signal according to an embodiment of the present invention.
  • FIG. 16 illustrates a transmission start point of mmWave data according to detection of an mmWave discovery signal according to another embodiment of the present invention.
  • FIG. 17 illustrates a flow of non-competition based random access procedure of mmWave system according to an embodiment of the present invention.
  • FIG. 18 illustrates an mmWave subframe index for mmWave RACH preamble transmission according to an embodiment of the present invention.
  • FIG. 19 illustrates a RACH region according to an embodiment of the present invention.
  • FIG. 20 illustrates a method of transmitting an mmWave RACH preamble according to an embodiment of the present invention.
  • 21 illustrates a transmission region of an mmWave RACH preamble according to an embodiment of the present invention.
  • FIG. 22 illustrates a terminal and a base station according to an embodiment of the present invention.
  • each component or feature may be considered to be optional unless otherwise stated.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some components and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
  • the base station is meant as a terminal node of a network that directly communicates with a mobile station.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
  • various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station.
  • the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS), or an access point.
  • a terminal may be a user equipment (UE), a mobile station (MS), a subscriber station (SS), or a mobile subscriber station (MSS). It may be replaced with terms such as a mobile terminal or an advanced mobile station (AMS).
  • UE user equipment
  • MS mobile station
  • SS subscriber station
  • MSS mobile subscriber station
  • AMS advanced mobile station
  • the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service
  • the receiving end refers to a fixed and / or mobile node that receives a data service or a voice service. Therefore, in uplink, a mobile station may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a mobile station may be a receiving end and a base station may be a transmitting end.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the IEEE 802.xx system, the 3rd Generation Partnership Project (3GPP) system, the 3GPP LTE system, and the 3GPP2 system, which are wireless access systems, and in particular, the present invention.
  • Embodiments of may be supported by 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321 and 3GPP TS 36.331 documents. That is, obvious steps or portions not described among the embodiments of the present invention may be described with reference to the above documents.
  • all terms disclosed in the present document can be described by the above standard document.
  • a cellular system may mean an LTE or LTE-A system and an mmWave system may mean a system supporting mmWave in an LTE or LTE-A system. That is, the mmWave system refers to a wireless access system that supports the mmWave characteristics.
  • the term ray may refer to a unique signal or a cluster of unique signals generated in the mmWave link when beamforming is not performed.
  • 3GPP LTE / LTE-A system will be described as an example of a wireless access system in which embodiments of the present invention can be used.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3GPP Long Term Evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A (Advanced) system is an improved system of the 3GPP LTE system.
  • embodiments of the present invention will be described based on the 3GPP LTE / LTE-A system, but can also be applied to IEEE 802.16e / m system and the like.
  • 1A is a diagram for describing an operation process of a terminal and a base station in a contention-based random access process.
  • a UE randomly selects one random access preamble from a set of random access preambles indicated by system information or a handover command, and transmits the random access preamble.
  • a resource may be selected and transmitted (S501).
  • the terminal After transmitting the random access preamble as in step S501, the terminal attempts to receive its random access response within the random access response receiving window indicated by the system information or the handover command (S502).
  • the random access response information may be transmitted in the form of a MAC PDU, and the MAC PDU may be transmitted through a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the UE monitors a physical downlink control channel (PDCCH). That is, the PDCCH preferably includes information of a terminal that should receive the PDSCH, frequency and time information of radio resources of the PDSCH, a transmission format of the PDSCH, and the like.
  • the UE Once the UE succeeds in receiving the PDCCH transmitted to the UE, it can properly receive the random access response transmitted to the PDSCH according to the information of the PDCCH.
  • the random access response includes a random access preamble identifier (ID; for example, RAPID (Random Access Preamble IDentifier)), an UL grant indicating an uplink radio resource, and a temporary C-RNTI. And Timing Advance Command (TAC).
  • ID random access preamble identifier
  • RAPID Random Access Preamble IDentifier
  • TAC Timing Advance Command
  • the reason why the random access (or random access) preamble discriminator is needed in the random access response is that the UL grant may be included because one random access response may include random access response information for one or more terminals. This is because it is necessary to inform which UE the temporary cell identifier and the TAC are valid. In this step, it is assumed that the UE selects a random access preamble identifier that matches the random access preamble selected by the UE in step S502. Through this, the UE may receive an UL grant, a temporary C-RNTI, a timing synchronization command (TAC), and the like.
  • TAC timing synchronization command
  • the terminal When the terminal receives a random access response valid to the terminal, it processes each of the information included in the random access response. That is, the terminal applies the TAC and stores the temporary cell identifier.
  • the data to be transmitted may be stored in the message 3 buffer in response to receiving a valid random access response.
  • the terminal transmits data (ie, a third message) to the base station by using the received UL grant (S503).
  • the third message should include the identifier of the terminal.
  • the base station cannot determine which terminals perform the random access process, because the terminal needs to be identified for future collision resolution.
  • Two methods have been discussed as a method of including the identifier of the terminal.
  • the first method if the UE already has a valid cell identifier assigned to the cell before the random access procedure, the UE transmits its cell identifier through an uplink transmission signal corresponding to the UL grant.
  • the terminal transmits its own unique identifier (eg, S-TMSI or random ID). In general, the unique identifier is longer than the cell identifier.
  • the UE transmits data corresponding to the UL grant it starts a timer for contention resolution (hereinafter referred to as "CR timer").
  • the terminal After the terminal transmits data including its identifier through the UL grant included in the random access response, the terminal waits for instructions from the base station to resolve the collision. That is, an attempt is made to receive a PDCCH in order to receive a specific message (S504). Two methods have been discussed in the method of receiving the PDCCH. As mentioned above, when the third message transmitted in response to the UL grant is transmitted using a cell identifier of its own, it attempts to receive the PDCCH using its cell identifier, and the identifier is a unique identifier. In this case, it may attempt to receive the PDCCH using the temporary cell identifier included in the random access response.
  • the terminal determines that the random access procedure has been normally performed, and terminates the random access procedure.
  • the terminal determines that the random access procedure has been normally performed, and terminates the random access procedure.
  • the non-competitive random access procedure ends the random access procedure only by transmitting the first message and transmitting the second message.
  • the terminal before the terminal transmits the random access preamble to the base station as the first message, the terminal is allocated a random access preamble from the base station, and transmits the allocated random access preamble to the base station as a first message and from the base station.
  • the random access procedure is terminated by receiving the random access response.
  • This discovery procedure is to support efficient power management for discovery of small cells and to discover as many small cells as possible at one time.
  • the discovery procedure is useful for efficiently detecting some target small cells among the compact small cells.
  • the discovery signal includes at least one of CRS, PSS, SSS or CSI-RS.
  • Discovery measurement timing configuration (DMTC), which is a measurement timing setting for the discovery signal, is provided to the terminal through RRC signaling.
  • 1B shows the structure of the DMTC. Referring to FIG. 1B, the DMTC may be set at 40, 80, 160 ms periods.
  • the DMTC has an offset of 0 or 1 in the PCell subframe or system frame index and its length is fixed (e.g., 6ms).
  • the terminal performs an RRM measurement (e.g., RSRP, RSRQ) for the discovery signal based on the DMTC, and reports the measurement result to the base station.
  • the discovery procedure is performed at the terminal in the RRC-connected state.
  • FIG. 2 is a diagram illustrating an example of an initial stage of reception beam scanning for transmission beam scanning according to an embodiment of the present invention
  • FIG. 3 is a method of performing beam scanning at a transmitting end after a reception lobe index is fixed at a receiving side. It is a figure which shows one of them.
  • the transmission beam is fixed and the receiving side, i.e., the terminal, rotates the reception beam scanning 360 degrees to derive a PDP (Power Delay Prifile) for each beam.
  • the terminal selects an index of a reception lobe having a ray having the largest power among the detected PDPs.
  • the lobe refers to each radiation group when the energy distribution of the radio waves radiated from the antenna is divided in various directions. That is, it means one type of beam during beam scanning.
  • Equation 1 is used to calculate the SNR of each lobe detected by the UE.
  • Equation 1 H i (k) denotes a radio channel of the i-th lobe for the transmission beam k, w i denotes a precoding matrix, p i denotes a reception power, and sigma ⁇ is noise. Sigma is the power of noise.
  • ⁇ k When a time at which reception beam scanning for a fixed transmission beam lobe is completed is defined as ⁇ k as shown in FIG. 3, ⁇ k may be determined as shown in Equation 2 below.
  • Equation 2 ⁇ exess _delay is an excess delay spread value representing the maximum delay time required for the beam scanning repeatedly at the receiving end, ⁇ prop_delay is a transmission delay value, and ⁇ process _delay is each received beam lobe.
  • PDP measurement time and the strong ray detection time for, N means the number of beam lobes on the receiving side.
  • the receiver repeats the above process, varying the entire transmission beam lobe of 360 to 360 degrees. Therefore, the beam scanning completion time of the receiving end is K ⁇ k .
  • K means the total number of transmission beams.
  • the terminal which is a receiving terminal, completes beam scanning, transmits a pilot signal to the mmWave base station again. Thereafter, the terminal performs 360-degree beam scanning to determine the transmitting side lobe index.
  • the time at which the transmission / reception beam scanning is completed is K ⁇ i + ⁇ tx _ scan .
  • Table 1 below defines the parameters for measuring the beam scanning completion time.
  • FIG. 4 illustrates a structure of a random access preamble repeated according to a beam direction according to an embodiment of the present invention.
  • N slot PRACH preambles are required according to N slot beam directions.
  • the length of each preamble may be reduced since the UE may have an opportunity to transmit a PRACH preamble for time synchronization per beam direction without considering RTT. .
  • 5 illustrates the use of a new type of PRACH preamble in accordance with an embodiment of the present invention.
  • FIG. 6 illustrates the use of a new type of PRACH preamble in accordance with another embodiment of the present invention.
  • NLoS non-line of sight
  • the synchronization of the strong NLoS link may be obtained to improve the performance of the mmWave uplink. Since the TA of the current UE is configured through the LoS link, a new type of PRACH preamble is required to correct the time asynchronousness that occurs as the UE transitions to the NLoS. For example, NLoS excess delay may appear to be approximately 1.4us in large cities.
  • the CP may exceed 0.5 us if the TA is not correct. Therefore, it is necessary to match the ⁇ TA synchronization to the changed NLoS link.
  • the NLoS cluster enters the CP and is transmitted based on the NLoS link (e.g., the Los link is blocked), a slight ⁇ TA correction can improve the link performance.
  • a new type of RACH preamble can be used for uplink synchronization by transmitting a short RACH.
  • the terminal may perform RACH transmission to the mmWave cell.
  • information about the mmWave link connection configuration is required.
  • the terminal may transmit the mmWave terminal specific contention free RACH preamble based on the information on the mmWave link connection configuration.
  • mmWave cell and mmWave terminal may use a strong NLoS link.
  • the mmWave cell is located with the legacy cell, and the legacy cell and the mmWave terminal are RRC-connected with legacy up / down links.
  • the legacy cell and the mmWave small cell may be located together, and the boundary of the NLoS small cell does not exceed the boundary of the mmWave small cell.
  • the mmWave link is wideband, has a short coherent time, and has a relatively small cell boundary. Therefore, mmWave links have a shorter symbol length than legacy links, more symbols are packed in one TTI, and spectral efficiency can be relaxed. In addition, the number of users in the mmWave cell is relatively small compared to the legacy link, so that user-specific reference signals and control channels can be formed.
  • mmWave system information may be transmitted over a legacy link.
  • System information may include, but is not limited to, for example, a frame structure index and mmWave system bandwidth.
  • the mmWave subframe may be set to a relatively small length compared to the legacy subframe.
  • the legacy cell to which the UE is RRC connected needs to provide UE-specific information related to beamforming in the mmWave initial access step. Since mmWave channel characteristics depend on the user's location, and the various transmission schemes for beamforming are different for each user's situation, mmWave link initial connection can be performed more quickly by providing information necessary for initial mmWave connection. Can be.
  • a terminal RRC connected to a legacy system and supporting mmWave up / downlink transmission may receive a terminal-specific mmWave link connection establishment message through downlink of the legacy system.
  • mmWave link connection setup message When the mmWave link connection setup message is transmitted, for example (i) if a high data rate service is required that is not supported by the legacy link (eg ultra high definition movie, ultra high definition real time streaming, hologram data transmission), (ii) If mmWave RACH transmission is required (eg, when the terminal desires such as high definition video chat, hologram telephony, ultra high definition streaming uploading, etc.), (iii) cases where services with higher priority than existing services should be used urgently, etc. Can be, but not limited to,
  • the mmWave link connection setup message may include, for example, (i) mmWave preamble measurement timing settings (e.g., mmWave DMTC) and (ii) mmWave preamble information.
  • the mmWave DMTC setting may include DMTC period and length information.
  • the mmWave DMTC may be set in the same or shorter period than the legacy DMTC according to the mmWave link characteristic, and may be set in consideration of the resolution of the mmWave frame structure.
  • 9 illustrates mmWave DMTC period and DMTC length settings according to an embodiment of the present invention. 9, mmWave DMTC period and DMTC length are set according to the legacy DMTC period.
  • multiple mmWave cells transmit an mmWave preamble, eg, a discovery signal, to the mmWave terminal based on the legacy DMTC period and the DMTC length. Therefore, no separate setting is required for mmWave DMTC.
  • mmWave preamble eg, a discovery signal
  • mmWave DMTC having a shorter period than the legacy DMTC period may be required.
  • the frequency of the discovery signal is orthogonal so that each mmWave cell can be distinguished from each other in the mmWave tracking area group (TAG) in transmitting each discovery signal.
  • mmWave DMTC setup according to another embodiment of the present invention.
  • mmWave DMTC is set to shorter period and shorter length than legacy DMTC.
  • mmWave DMTC period is set to j ms less than the legacy DMTC period.
  • a short mmWave DMTC length can be set.
  • the power used for cell discovery can be reduced.
  • Such mmWave DMTC period and DMTC length may be set through the RRC signaling of the legacy cell.
  • the mmWave discovery signal information may be, for example, for ray scanning (or beam scanning).
  • mmWave discovery signals can be transmitted over the entire mmWave system band over a wide band.
  • CRS and CSI-RS may be used to measure RSRP as a discovery signal
  • the overhead may not be significant even if the discovery signal is transmitted over the entire mmWave band due to a short symbol or TTI compared to the low frequency TTI.
  • the discovery signal may be used as the mmWave preamble, but is not limited thereto. In the following description, it is assumed that the discovery signal is used as the mmWave preamble for convenience of description.
  • a discovery signal is transmitted from the mmWave cell to the mmWave terminal according to the direction of each beam.
  • the mmWave terminal discovers the mmWave cell by measuring the discovery signal within the mmWave DMTC period.
  • the mmWave discovery signal information may include an mmWave cell index, a shape of the mmWave discovery signal, and frequency information of the discovery signal.
  • a mmWave cell index, mmWave discovery signal shape information, and a frequency resource location where a discovery signal is transmitted for each mmWave cell may be provided to the terminal according to the location of each mmWave terminal.
  • Transmission configuration of discovery signals determined based on a tracking area group (TAG) of each mmWave terminal and mmWave DMTC of the mmWave terminal need to be set in advance.
  • TAG tracking area group
  • the mmWave TAG of the mmWave terminal includes mmWave cells (a), (b), and (c). 12 illustrates setting of mmWave TAG and discovery discovery signal according to mmWave terminal position.
  • discovery signals may overlap due to a propagation delay from each mmWave cell to the mmWave terminal. have. Accordingly, in order to allow the UE to distinguish which mmWave cell is a discovery signal transmitted, the frequency domains in which each mmWave cell transmits the discovery signal may be orthogonal to each other.
  • the discovery signal of each mmWave cell may be set in a different shape within the mmWave TAG.
  • the index of the transmission timing of the mmWave discovery signal may be provided as mmWave discovery signal information.
  • FIG. 13 illustrates a timing setting for transmitting an mmWave discovery signal in a cell of mmWave TAG according to an embodiment of the present invention.
  • the timing of discovery signal transmission of mmWave cells in each mmWave TAG is set differently, so that mmWave discovery signals of mmWave cells do not overlap. Accordingly, when the mmWave terminal detects the discovery signal, an error due to overlapping of the discovery signals may be minimized.
  • the discovery signal pattern information and the beam resolution information may be provided as mmWave discovery signal information.
  • the pattern of the discovery signal can be used to reduce the ambiguity of the discovery signal estimation.
  • Different patterns may be set for the mmWave discovery signal for each mmWave cell. For example, when the mmWave terminal receives the mmWave discovery signal, it performs autocorrelation with the waveform set in each mmWave cell, and knows in which beam direction the maximum power appears when determining the peak of the autocorrelation. Can be.
  • FIG. 14 is a diagram for describing a method of determining a beam direction by performing autocorrelation according to an embodiment of the present invention.
  • the resolution of the coarse beam is set to 120 degrees on the 2D plane so that the discovery signal is transmitted by beamforming in three directions.
  • the mmWave terminal may determine the direction in which the reception power of the discovery signal is maximized by performing autocorrelation after receiving the discovery signal.
  • the reception power of the discovery signal is maximized at ⁇ b1 of the mmWave cell (b).
  • the direction of the beam for initial connection is determined at 120 degrees.
  • mmWave discovery signal length information may be provided as mmWave discovery signal information.
  • the reference of the mmWave frame index may be set based on the beam direction selected by the beam scanning.
  • the mmWave data transmission time may be implicitly indicated based on the mmWave discovery signal length information.
  • the UE may know that data is transmitted on the mmWave link after a time offset of (N-m) ⁇ .
  • the UE If detection of the first transmitted discovery signal fails, the UE cannot know when the discovery signal is transmitted, and thus, the UE cannot know when data is transmitted in mmWave downlink.
  • the time at which the mmWave base station starts transmitting the mmWave discovery signal may be indicated by the index of the legacy subframe.
  • FIG. 15 illustrates a transmission start point of mmWave data according to detection of an mmWave discovery signal according to an embodiment of the present invention.
  • the UE may obtain the mmWave subframe index on which mmWave data is transmitted based on the index of the legacy subframe.
  • the mmWave subframe index may be obtained as shown in Equation 3 below.
  • Equation 3 D is an mmWave subframe index, and K is a legacy subframe index corresponding to the point of time when the correlation is maximum.
  • the transmission time of mmWave data (detection time of mmWave discovery signal + D * legacy subframe length-n ⁇ ).
  • transmission intervals of mmWave discovery signals of mWave base stations may overlap each other, whereas in the embodiment of FIG. 16, transmission intervals of mmWave discovery signals are not overlapped with each other.
  • the UE may determine how many more mmWave discovery signals have been transmitted since the maximum autocorrelation peak is detected in the ⁇ b1 direction of the mmWave base station (b).
  • the terminal may determine an absolute mmWave frame transmission time based on this. For example, if the mmWave discovery signal is additionally transmitted six times, the transmission time point of the data is transmitted 6? After the maximum autocorrelation peak.
  • FIG. 17 illustrates a flow of non-competition based random access procedure of mmWave system according to an embodiment of the present invention.
  • a new type of RACH Preamble is used for time synchronization for fine beams.
  • a new type of RACH preamble can be used after adjusting the TA of mmWave uplink for the coarse beam.
  • the legacy cell transmits an mmWave link connection establishment message to the terminal and the mmWave cell (S1605 and S1606).
  • the RACH timing information may be included in the mmWave link connection configuration information transmitted to the mmWave cell.
  • the terminal performs downlink synchronization with the mmWave cell (S1610).
  • the UE repeatedly transmits a PRACH preamble (S1615). Repetitive transmission of the PRACH preamble is training for coarse beams formed in different directions, and is for searching for a coarse beam in which maximum gain appears. For the PRACH preamble transmitted for the coarse beam, the pattern of the RACH preamble defined in the current LTE / LTE-A may be used.
  • the terminal receives a PRACH response from the mmWave cell (S1620).
  • the PRACH response may be for the best coarse beam where the gain of beam forming is maximal.
  • the terminal performs primary TA correction on the optimal coarse beam based on the PRACH response.
  • the terminal may transmit the above-described new type of RACH preamble (S1625).
  • a new type of RACH preamble may be sent for secondary TA acquisition for fine beams.
  • the terminal receives a PRACH response from the mmWave cell (S1630).
  • the PRACH response is a response regarding an optimal microbeam, and the terminal performs secondary TA correction based on the response.
  • the RACH preamble for the coarse beam and the new type of RACH preamble for the fine beam are illustrated as a series of consecutive procedures, but the present invention is not limited thereto.
  • a new type of RACH preamble may be transmitted in a period faster than the existing RACH transmission period.
  • the new type of PRACH configuration for the fine beam may be transmitted in a mixed form with the PRACH configuration for the coarse beam or through an independent configuration.
  • FIG. 18 illustrates an mmWave subframe index for mmWave RACH preamble transmission according to an embodiment of the present invention.
  • the subframe index for transmission timing of the mmWave RACH may be transmitted in downlink of mmWave or may be provided to the terminal through an mmWave link connection establishment message. Meanwhile, since it is determined whether the mmWave cell and the uplink are connected to the terminal, the above-described RACH procedure may be performed according to the beam direction of the terminal for uplink.
  • the mmWave RACH procedure may be performed on a contention basis.
  • a scheme for reducing collisions of random access preambles between terminals in a contention-based mmWave RACH procedure will be described.
  • a time / frequency offset value of a resource for transmitting the RACH preamble may be configured to be UE-specific.
  • the transmission region (resource) of the RACH preamble may be set as in Equation 4.
  • Equation 4 k may be a user index specific for each user (eg, legacy RNTI series, GUTI, or M-TMSI). May mean an ID of the estimated mmWave downlink beam.
  • f beam , k () is a resource region specified based on the estimated beam ID, (i, j) is a time and frequency index, respectively, and the time index may be a subframe, a slot or a frame index, and the frequency index is an RB index. It may be, but is not limited to.
  • Equation 4 may be preset at both the mmWave base station and the mmWave terminal.
  • FIG. 19 illustrates a RACH region according to an embodiment of the present invention.
  • Table 3 shows the mapping relationship between the index of the logical root Zadoff-Chu sequence and the index of the physical root Zadoff-Chu sequence for the preamble format 0-3 disclosed in the 3GPP TS 36.211 document.
  • Nzc means the length of the Zadoff-Chu sequence.
  • the RACH preamble group may be implicitly estimated based on the estimated beam ID.
  • a set of sequences to be used by users corresponding to the corresponding beam IDs may be preset.
  • the index of the logical root Zadoff-Chu sequence may be defined by the beam ID as shown in Equation 7.
  • Table 4 shows a PRACH configuration in the RRC layer defined in 3GPP TS 36.331.
  • PRACH-ConfigSIB is provided through system information
  • PRACH-Config is provided through mobility control information
  • the PRACH transmission timing setting corresponding to the beam ID may be further included in the PRACH-ConfigSIB.
  • the root sequence index in PRACH-Config may be determined as in Equation 6, the root sequence index may be omitted from PRACH-Config.
  • the RACH preamble may be determined as shown in Equation 7 based on the root Zadoff-Chu sequence determined in Equation 5.
  • Equation 7 Cv is a frequency shift, and is defined as Equation 8.
  • a value corresponding to the RACH preamble parameter may be set in advance through GUTI or legacy RNTI.
  • the v value for cyclic shift can be determined using M-TMSI of GUTI.
  • Equation 9 represents a v value according to an embodiment of the present invention.
  • Equation 9 floor () denotes a maximum integer not exceeding an input value of parentheses.
  • 'Ncs' represents a cyclic shift constant given according to a preamble format.
  • FIG. 20 illustrates a method of transmitting an mmWave RACH preamble according to an embodiment of the present invention. The description overlapping with the above description is omitted.
  • the mmWave terminal scans an mmWave beam (S2005).
  • the mmWave terminal determines the mmWave RACH preamble based on the beam scanning result (S2010). For example, the mmWave terminal estimates the beam ID according to the beam scanning result. The mmWave terminal determines the mmWave RACH preamble using the estimated beam ID and its identifier (e.g., GUTI or RNTI).
  • the mmWave terminal determines the mmWave RACH preamble using the estimated beam ID and its identifier (e.g., GUTI or RNTI).
  • the mmWave terminal transmits the determined RACH preamble at a timing corresponding to the estimated beam ID (S2015). For example, as shown in FIG. 21, the timing for transmitting the RACH preamble may be set differently according to each beam ID.
  • the mmWave base station performs mmWave uplink synchronization according to the entire beam transmission cycle (S2020).
  • the mmWave terminal may perform mmWave initial access in a legacy RRC connected state. That is, the mmWave terminal performs initial access to form the mmWave link with the mmWave base station in the RRCE connection with the legacy base station.
  • the mmWave RACH process may be performed together with the mmWave downlink discovery process.
  • FIG. 22 illustrates a terminal and a base station according to an embodiment of the present invention.
  • the terminal and the base station illustrated in FIG. 22 may perform the above-described embodiments.
  • a user equipment may operate as a transmitter in uplink and a receiver in downlink.
  • an e-Node B eNB
  • eNB e-Node B
  • the terminal and the base station may include a transmitting module (Tx module: 2140, 2150) and a receiving module (Rx module: 2150, 2170), respectively, to control the transmission and reception of information, data, and / or messages.
  • Tx module: 2140, 2150 a transmitting module
  • Rx module: 2150, 2170 a receiving module
  • Antennas 2100 and 2110 for transmitting and receiving data and / or messages.
  • the terminal and the base station may each include a processor 2120 and 2130 for performing the above-described embodiments of the present invention, and memories 2180 and 2190 capable of temporarily or continuously storing the processing of the processor. Can be.
  • Embodiments of the present invention can be performed using the components and functions of the above-described terminal and base station apparatus.
  • the transmitting module and the receiving module included in the terminal and the base station include a packet modulation and demodulation function, a high speed packet channel coding function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, and a time division duplex (TDD) for data transmission.
  • Duplex may perform packet scheduling and / or channel multiplexing.
  • the terminal and the base station of FIG. 21 may further include a low power radio frequency (RF) / intermediate frequency (IF) module.
  • RF radio frequency
  • IF intermediate frequency
  • the terminal is a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) phone, an MBS.
  • PDA personal digital assistant
  • PCS personal communication service
  • GSM Global System for Mobile
  • WCDMA Wideband CDMA
  • MBS Multi Mode-Multi Band
  • a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal incorporating data communication functions such as schedule management, fax transmission and reception, which are functions of a personal mobile terminal, in a mobile communication terminal.
  • a multimode multiband terminal can be equipped with a multi-modem chip to operate in both portable Internet systems and other mobile communication systems (e.g., code division multiple access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Speak the terminal.
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • Embodiments of the invention may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to embodiments of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs). Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
  • software code may be stored in the memory units 2180 and 2190 to be driven by the processors 2120 and 2130.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • Embodiments of the present invention can be applied to various wireless access systems.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Conformément à un mode de réalisation, la présente invention concerne un procédé pour accéder à une cellule à onde millimétrique par un terminal dans un système de communication sans fil prenant en charge une onde millimétrique (onde mm), lequel procédé consiste : à balayer une pluralité de faisceaux d'onde millimétrique formés séquentiellement dans différentes directions ; à estimer un identifiant (ID) d'un faisceau d'onde millimétrique auquel le terminal appartient, selon le résultat de balayage ; et à transmettre un préambule d'accès aléatoire à une cellule à onde millimétrique, le préambule d'accès aléatoire étant transmis par l'intermédiaire d'une zone de ressource spécifique au terminal déterminée sur la base de l'ID estimé du faisceau d'onde millimétrique et d'un identifiant du terminal.
PCT/KR2016/005431 2015-09-21 2016-05-23 Procédé pour accéder à une cellule à onde millimétrique dans un système de communication sans fil et dispositif associé Ceased WO2017052026A1 (fr)

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CN109565887A (zh) * 2017-06-01 2019-04-02 Lg 电子株式会社 在无线通信系统中发送和接收随机接入信道的方法及其设备
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CN111758296B (zh) * 2018-02-27 2023-09-29 高通股份有限公司 用于具有波束切换的随机接入信道(rach)前置码传输的功率斜升
CN112087811A (zh) * 2019-06-14 2020-12-15 普天信息技术有限公司 随机接入前导码的发送方法和装置
CN113630896A (zh) * 2021-02-22 2021-11-09 中国科学院上海高等研究院 随机接入方法、基站以及终端
CN113630896B (zh) * 2021-02-22 2023-09-01 中国科学院上海高等研究院 随机接入方法、基站以及终端

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