WO2008016248A1 - Procédé d'accès aléatoire utilisant des modèles de saut de fréquence différents entre des cellules voisines et un dispositif de communication mobile - Google Patents

Procédé d'accès aléatoire utilisant des modèles de saut de fréquence différents entre des cellules voisines et un dispositif de communication mobile Download PDF

Info

Publication number
WO2008016248A1
WO2008016248A1 PCT/KR2007/003655 KR2007003655W WO2008016248A1 WO 2008016248 A1 WO2008016248 A1 WO 2008016248A1 KR 2007003655 W KR2007003655 W KR 2007003655W WO 2008016248 A1 WO2008016248 A1 WO 2008016248A1
Authority
WO
WIPO (PCT)
Prior art keywords
rach
random access
rach burst
channel
burst
Prior art date
Application number
PCT/KR2007/003655
Other languages
English (en)
Inventor
Hyoseok Lee
Il-Gyu Kim
Hyeong-Geun Park
Young-Jo Ko
Kapseok Chang
Young-Hoon Kim
Seung-Chan Bang
Original Assignee
Electronics And Telecommunications Research Institute
Samsung Electronics Co., Ltd,
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020070072450A external-priority patent/KR101320398B1/ko
Application filed by Electronics And Telecommunications Research Institute, Samsung Electronics Co., Ltd, filed Critical Electronics And Telecommunications Research Institute
Priority to US12/375,840 priority Critical patent/US8130717B2/en
Publication of WO2008016248A1 publication Critical patent/WO2008016248A1/fr

Links

Classifications

    • 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
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]

Definitions

  • the present invention relates to a transmission method of a mobile station, and more particularly, to a random access method of a mobile station for receiving a random access channel burst hopping pattern of a cell to which the mobile station belongs from a base station and obtaining a random access transmission diversity gain using the random access channel burst hopping pattern when the mobile station tries a random access in an uplink of a cellular system.
  • the present invention was supported by the Information Technology (IT) Research & Development (R&D) program of the Ministry of Information and Communication (MIC) [Project management number: 2005-S-404-12, Project title: Research & Development of Radio Transmission Technology for 3G evolution].
  • IT Information Technology
  • R&D Research & Development
  • MIC Ministry of Information and Communication
  • Orthogonal Frequency Division Multiple Access as a downlink transmission method and Discrete Fourier Transform Spread OFDMA (DFT Spread OFDMA or
  • DFT-S-OFDMA as an uplink transmission method as candidate technologies of radio transmission technology for Long Term Evolution (LTE).
  • LTE Long Term Evolution
  • RACH Random Access Channel
  • the present invention suggests a method of preventing random access burst collision between neighboring cells and obtaining a diversity gain in a frequency domain by using a hopping pattern in RACH transmission of a mobile station when DFT Spread
  • OFDMA technology is used in an uplink of a cellular system.
  • the present invention suggests a method of receiving a random access channel i burst hopping pattern of a cell to which a mobile station belongs through a Broadcast Channel (BCH) and obtaining a random access transmission diversity gain using the random access channel burst hopping pattern when the mobile station tries a random access in an uplink of a cellular system using a DFT-S-OFDMA method in the uplink.
  • BCH Broadcast Channel
  • Other purposes and advantages of the present invention can be understood based on the description below and more clearly known from the embodiments of the present invention.
  • the purposes and advantages of the present invention can be realized by mechanisms and a set thereof as disclosed in the claims.
  • a mobile station can obtain a diversity gain without a Random Access Channel (RACH) burst collision by hopping according to a cell group in a frequency domain and transmitting a random access when random access resources are used between neighboring cells and detect an RACH even with low transmission power by applying switching diversity together with the frequency hopping.
  • RACH Random Access Channel
  • FIG. 1 illustrates neighboring cells transmitting data, which are grouped into three cell groups, according to an embodiment of the present invention
  • FIG. 2 is a block diagram of a mobile station according to an embodiment of the present invention.
  • FIGS. 3A and 3B are block diagrams of a transmitter of a mobile station having two antennas, according to embodiments of the present invention
  • FIGS.4A through 4C illustrate a method of using hopping patterns without collision between neighboring cells in a Random Access Channel (RACH) burst transmission
  • FIG. 5 is a flowchart of a random access method of a mobile station according to an embodiment of the present invention.
  • a random access method of a mobile station comprising: receiving, by a mobile station belonging to a predetermined cell designed such that each neighboring cell belongs to a different group, Random Access Channel (RACH) information of a cell group to which the mobile station belongs from a base station belonging to the cell; assigning a channel to an RACH burst based on the RACH information; and transmitting the RACH burst via the assigned channel.
  • RACH Random Access Channel
  • a mobile communication apparatus comprising: a receiver receiving, by a mobile station belonging to a predetermined cell designed such that each neighboring cell belongs to a different group, Random Access Channel (RACH) information of a cell group to which the mobile station belongs from a base station belonging to the cell; a channel assignment unit assigning a channel to an RACH burst based on the RACH information; and a transmitter transmitting the RACH burst via the assigned channel.
  • RACH Random Access Channel
  • the RACH information may comprise an Identification (ID) of the cell group and random access hopping pattern information set to the cell group in a frequency domain, and the hopping patterns may be differently set for each cell group.
  • ID an Identification
  • hopping patterns may be differently set for each cell group.
  • a computer readable recording medium storing a computer readable program for executing a random access method of a mobile station.
  • FIG. 1 illustrates neighboring cells transmitting data, which are grouped into three cell groups, according to an embodiment of the present invention.
  • physically neighboring cells transmitting data are divided into more than two cell groups, and a cell group ID and a random access hopping pattern are assigned to cells and base stations of each cell group.
  • cells belonging to the same cell group are designed not adjacent to each other.
  • the random access hopping patterns are differently set to each of the cell groups and can be set to be periodically changed.
  • Each mobile station in a cell belonging to a cell group among a plurality of cell groups transmits a Random Access Channel (RACH) to a base station in the same cell based on hopping pattern information received from the base station.
  • RACH Random Access Channel
  • neighboring cells are grouped into three groups, which are a first cell group 100a, a second cell group 100b, and a third cell group 100c.
  • This cell plan may be implemented by devices or set to each base station by being abstractly performed.
  • Examples of the former are a method of installing a device generally controlling an Orthogonal Frequency Division Multiple Access (OFDMA) cellular system to perform grouping and a method of installing a device in all or partial base stations to perform grouping in association with the base stations.
  • An example of the latter is a method in which a system manager sets cell group information into each base station by performing the above-described grouping when an Orthogonal Frequency Division Multiple Access (OFDMA) cellular system is constructed.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • FIG. 2 is a block diagram of a mobile station 200 according to an embodiment of the present invention.
  • the mobile station 200 equipped with an antenna 210, includes a receiver 220, a channel assignment unit 230, a transmitter 260, and an OFDMA demodulator 270.
  • the receiver 220 receives an input signal via the antenna 210 from a base station in a cell to which the mobile station 200 belongs and performs processing, such as frequency transformation and analog-to-digital conversion, of the received input signal.
  • the receiver 220 determines whether the input signal received from the base station is a BCH signal or a data signal, and if it is determined that the input signal is a BCH signal, the receiver 220 outputs the input signal to the channel assignment unit 230, and if it is determined that the input signal is a data signal, the receiver 220 outputs the input signal to the OFDMA demodulator 270.
  • the cell to which the mobile station 200 belongs is in a cell group from among a plurality of cell groups, and cells adjacent to the cell to which the mobile station 200 belongs is in other cell groups.
  • the BCH signal contains RACH information, such as a cell group ID of the cell to which the mobile station 200 belongs and random access hopping pattern information in a frequency domain.
  • Random access hopping patterns are differently set to each of cell groups in order for collision not to occur between cell groups in RACH burst transmission.
  • the channel assignment unit 230 assigns a channel to an RACH burst based on the RACH information and includes a sub-band controller 240 and an OFDMA modulator 250.
  • the sub-band controller 240 extracts the cell group ID and the random access hopping pattern information in the frequency domain from the received BCH signal and generates a control signal for selecting a sub-band assigned to an RACH burst according to the random access hopping pattern information.
  • the OFDMA modulator 250 assigns a selected sub-band to the RACH burst and generates an RACH burst signal by performing OFDMA modulation in a predetermined method.
  • the OFDMA modulator 250 can include a Fast Fourier Transformer (FFT), a mapper, an Inverse FFT (IFFT), a Cyclic Prefix (CP) inserter, and a parallel-to-serial converter.
  • FFT Fast Fourier Transformer
  • IFFT Inverse FFT
  • CP Cyclic Prefix
  • the FFT fast Fourier transforms the RACH burst
  • the mapper maps output symbols of the FFT onto a sub-carrier of a corresponding sub-band according to the control signal of the sub-band controller 240.
  • the transmitter 260 performs processing, such as digital-to-analog conversion and frequency transformation, of an output RACH burst signal of the OFDMA modulator 250 and transmits a result to the base station via the antenna 210.
  • the OFDMA demodulator 270 restores data by performing OFDMA demodulation of the received data signal in a predetermined method.
  • FIGS. 3A and 3B are block diagrams of the transmitter 260 of the mobile station 200 having two transmission antennas, according to embodiments of the present invention.
  • the receiver 220 illustrated in FIG. 2 receives RACH information from one of the two transmission antennas, and the transmitter 260 illustrated in FIG. 2 transmits an RACH burst signal to a base station by alternately using the two transmission antennas.
  • the transmitter 260 (as referred to 260A) includes a switching unit 310 and a transmission signal processing unit 330.
  • the switching unit 310 selects an antenna through which an RACH burst signal is to be transmitted from among the two transmission antennas according to a predetermined method and outputs the RACH burst signal to the transmission signal processing unit 330 connected to the selected antenna (the first or second antenna).
  • the transmission signal processing unit 330 performs processing, such as digital-to-analog conversion and frequency transformation, of the RACH burst signal input from the switching unit 310 and transmits the processed signal to a base station via the selected antenna.
  • the transmitter 260 (as referred to 260B) includes a transmission signal processing unit 350 and a switching unit 370.
  • the transmission signal processing unit 350 performs processing, such as digital-to-analog conversion and frequency transformation, of an RACH burst signal input from the OFDMA modulator 250 illustrated in FIG. 2.
  • the switching unit 370 connects the transmission signal processing unit 350 to the first or second antenna so that the RACH burst signal is alternately transmitted via the first and second antennas, selects a transmission antenna according to a predetermined method, such as Time-Switched Transmission Diversity (TSTD), and transmits the output signal of the transmission signal processing unit 350 via the selected antenna.
  • a predetermined method such as Time-Switched Transmission Diversity (TSTD)
  • FIGS. 4A through 4C illustrate a method of using hopping patterns without collision between neighboring cells in an RACH burst transmission.
  • This illustration is described using a 3 rd Generation Long Term Evolution (3G LTE) uplink frame structure in a Discrete Fourier Transform Spread OFDMA (DFT-S) OFDMA method and described with an example in which each mobile station transmits an RACH burst signal.
  • 3G LTE 3 rd Generation Long Term Evolution
  • DFT-S Discrete Fourier Transform Spread OFDMA
  • a radio frame 400 constitutes of an RACH transmission part for RACH burst transmission and a data transmission part for packet data transmission.
  • the data transmission part includes a plurality of data sub-frames 410, and the RACH transmission part includes one or more RACH sub-frames 420.
  • Each RACH sub-frame 420 is divided into a plurality of sub-bands.
  • a mobile station uses only one sub-band from among the sub-bands in an RACH sub-frame when the mobile station transmits an RACH burst signal.
  • a mobile station belonging to the first cell group 100a of FIG. 1 can transmit an
  • RACH burst signal by hopping the sub-bands 410-a, 420-b, and 430-c when the RACH burst signal is transmitted along a time axis
  • a mobile station belonging to the second cell group 100b of FIG. 1 can transmit an RACH burst signal by hopping sub-bands 410-b, 420-c, and 430-a.
  • FIGS. 4B and 4C 1 when antenna switching is additionally introduced, the mobile station belonging to the first cell group 100a of FIG.
  • RACH burst signal can transmit an RACH burst signal by hopping sub-bands and switching antennas, such as sub-band 410-a/first antenna, sub-band 420-b/second antenna, and sub-band 430-c/first antenna, and the mobile station belonging to the second cell group 100b of FIG. 1 can transmit an RACH burst signal by hopping sub-bands and switching antennas, such as sub-band 410-b/second antenna, sub-band 420-c/first antenna, and sub-band 430-a/second antenna.
  • hopping sub-bands and switching antennas such as sub-band 410-b/second antenna, sub-band 420-c/first antenna, and sub-band 430-a/second antenna.
  • mobile stations and base stations can prevent collision by transmitting an RACH burst signal using resources different from those of neighboring cells and obtain a diversity effect in the frequency domain by hopping in the frequency domain, thereby significantly increasing a random access signature detection probability of a mobile station.
  • a mobile station transmits a random access burst by hopping with information related to a cell group ID and a hopping pattern received from a BCH signal of a base station when transmitting a
  • the random access signature detection probability can be increased more.
  • FIG. 5 is a flowchart of a random access method of a mobile station according to an embodiment of the present invention.
  • the mobile station receives RACH information of a cell group to which the mobile station belongs from a base station belonging to the same cell as that to which the mobile station belongs via an antenna in operation S510.
  • the RACH information includes a cell group ID and hopping pattern information in a frequency domain, which is set to the cell group, and is acquired from a BCH signal of the base station.
  • the received hopping pattern is differently set for each of cell groups.
  • the mobile station assigns a channel to an RACH burst based on the RACH information.
  • the mobile station extracts the hopping pattern information in the frequency domain, which is set to the cell group, from the RACH information in operation S520, selects a sub-channel (sub-band) through which the RACH burst is transmitted according to the extracted hopping pattern in operation S530, and generates an RACH burst signal by assigning the selected sub-channel to the RACH burst and OFDMA modulating the RACH burst in operation S540.
  • the mobile station transmits the RACH burst using the assigned sub-channel in operation S550.
  • the mobile station transmits the RACH burst by selecting an antenna through which the RACH burst is to be transmitted from among the transmission antennas and signal processing the RACH burst or transmits the RACH burst by signal processing the RACH burst and selecting an antenna through which the signal-processed RACH burst is to be transmitted from among the transmission antennas.
  • the invention can also be embodied as computer readable codes on a computer readable recording medium.
  • the computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the Internet).
  • ROM read-only memory
  • RAM random-access memory
  • CD-ROMs compact discs
  • magnetic tapes magnetic tapes
  • floppy disks optical data storage devices
  • carrier waves such as data transmission through the Internet
  • carrier waves such as data transmission through the Internet
  • the computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. Also, functional programs, codes, and code segments for accomplishing the present invention can be easily construed by programmers skilled in the art to which the present invention pertains.
  • a mobile station can obtain a diversity gain without an RACH burst collision by hopping according to a cell group in a frequency domain and transmitting a random access when random access resources are used between neighboring cells, thereby increasing the RACH signature detection probability of a base station.
  • RACH detection can be performed even with low transmission power as compared to when the switching diversity is not applied, thereby expanding cell coverage of an uplink.

Abstract

L'invention concerne un procédé d'accès aléatoire d'une station mobile et un dispositif de communication mobile conçu pour mettre en oeuvre ledit procédé. La station mobile peut obtenir un gain de diversité sans collision de salve de canal à accès aléatoire (RACH) par saut en fonction d'un groupe de cellules situé dans un domaine de fréquence et par transmission d'un accès aléatoire lorsque des ressources d'accès aléatoire sont utilisées entre des cellules voisines et peut détecter un RACH même avec une faible puissance de transmission par application de la diversité de commutation associée au saut de fréquence.
PCT/KR2007/003655 2006-07-31 2007-07-30 Procédé d'accès aléatoire utilisant des modèles de saut de fréquence différents entre des cellules voisines et un dispositif de communication mobile WO2008016248A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/375,840 US8130717B2 (en) 2006-07-31 2007-07-30 Random access method using different frequency hopping patterns between neighboring cells and mobile communication device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2006-0072267 2006-07-31
KR20060072267 2006-07-31
KR1020070072450A KR101320398B1 (ko) 2006-07-31 2007-07-19 셀 간 이종 주파수 호핑을 이용한 랜덤 액세스 방법 및이를 수행하는 이동 통신 장치
KR10-2007-0072450 2007-07-19

Publications (1)

Publication Number Publication Date
WO2008016248A1 true WO2008016248A1 (fr) 2008-02-07

Family

ID=38997397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2007/003655 WO2008016248A1 (fr) 2006-07-31 2007-07-30 Procédé d'accès aléatoire utilisant des modèles de saut de fréquence différents entre des cellules voisines et un dispositif de communication mobile

Country Status (1)

Country Link
WO (1) WO2008016248A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170656A (zh) * 2011-03-25 2011-08-31 中兴通讯股份有限公司 协调lte系统随机接入与异频测量冲突的方法、装置及终端
US9303042B2 (en) 2012-03-27 2016-04-05 The Regents Of The University Of California Triazolothienopyrimidine compound inhibitors of urea transporters and methods of using inhibitors
WO2017105005A1 (fr) * 2015-12-18 2017-06-22 엘지전자 주식회사 Procédé et dispositif sans fil permettant de transmettre un préambule d'accès aléatoire au moyen d'un procédé à tonalité unique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000152343A (ja) * 1998-11-12 2000-05-30 Lucent Technol Inc ワイヤレス通信システムへのシステムアクセスを得る方法
WO2005086520A1 (fr) * 2004-03-09 2005-09-15 Matsushita Electric Industrial Co., Ltd. Procede d’acces aleatoire et dispositif de terminal de radiocommunication
WO2005122616A1 (fr) * 2004-06-10 2005-12-22 Matsushita Electric Industrial Co., Ltd. Dispositif terminal de communication, dispositif de station de base et systeme de communication radio
US20050286409A1 (en) * 2004-06-25 2005-12-29 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving uplink random access channel in mobile communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000152343A (ja) * 1998-11-12 2000-05-30 Lucent Technol Inc ワイヤレス通信システムへのシステムアクセスを得る方法
WO2005086520A1 (fr) * 2004-03-09 2005-09-15 Matsushita Electric Industrial Co., Ltd. Procede d’acces aleatoire et dispositif de terminal de radiocommunication
WO2005122616A1 (fr) * 2004-06-10 2005-12-22 Matsushita Electric Industrial Co., Ltd. Dispositif terminal de communication, dispositif de station de base et systeme de communication radio
US20050286409A1 (en) * 2004-06-25 2005-12-29 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving uplink random access channel in mobile communication system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170656A (zh) * 2011-03-25 2011-08-31 中兴通讯股份有限公司 协调lte系统随机接入与异频测量冲突的方法、装置及终端
CN102170656B (zh) * 2011-03-25 2015-06-03 中兴通讯股份有限公司 协调lte系统随机接入与异频测量冲突的方法、装置及终端
US9303042B2 (en) 2012-03-27 2016-04-05 The Regents Of The University Of California Triazolothienopyrimidine compound inhibitors of urea transporters and methods of using inhibitors
WO2017105005A1 (fr) * 2015-12-18 2017-06-22 엘지전자 주식회사 Procédé et dispositif sans fil permettant de transmettre un préambule d'accès aléatoire au moyen d'un procédé à tonalité unique
US10743351B2 (en) 2015-12-18 2020-08-11 Lg Electronics Inc. Method and wireless device for transmitting random-access preamble by means of single-tone method

Similar Documents

Publication Publication Date Title
US8165097B2 (en) Transmission method of mobile station for random access channel diversity
CN106538027B (zh) 无线通信系统中在非许可频谱中发送wi-fi信号的方法和装置
US8259697B2 (en) Transmission method of mobile station for random access channel diversity
CN103402239B (zh) 用于相邻小区测量的关于参考信号结构的信息
CN101409577B (zh) 一种基于码扩正交频分多址（cs-ofdma）的智能天线无线系统
US20100128805A1 (en) Transmitter, receiver and communication method
US8040854B2 (en) OFDM wireless communication method and wireless communication apparatus
US8130717B2 (en) Random access method using different frequency hopping patterns between neighboring cells and mobile communication device
KR20080017201A (ko) 광대역 무선 통신 시스템에서 역방향 접근채널의 프리앰블송수신 방법 및 장치
US11563542B2 (en) Apparatus and method for performing initial access in wireless communication system
CA2869000A1 (fr) Procede d'acces multiple et structure de signal pour communications d2d
CN101635619B (zh) 子载波发送方法、基站和系统
US8582537B2 (en) Communication method and terminal apparatus using the same
EP1750409B1 (fr) Procédé et dispositif de réception de signaux de fréquences adjacentes dans un système cellulaire
JP2001320346A (ja) 直交周波数分割多重変調とスペクトル拡散を併用する送信装置、受信装置および基地局
EP1641158A1 (fr) Systeme de transmission radioelectrique a ondes porteuses multiples, dispositif emetteur et dispositif recepteur
US20210235309A1 (en) Dynamic transmit chain availability signaling in wireless devices
US8514803B2 (en) Non-coherent detection method of the number of transmit antenna ports for OFDMA
WO2008016248A1 (fr) Procédé d'accès aléatoire utilisant des modèles de saut de fréquence différents entre des cellules voisines et un dispositif de communication mobile
WO2022241376A1 (fr) Signal de référence de suivi de phase amélioré pour assistance numérique post-distorsion
EP4338346A1 (fr) Signal de référence de démodulation amélioré pour assistance numérique post-distorsion
WO2022186972A1 (fr) Répétition par échantillon d'un préambule d'accès aléatoire
WO2021226144A1 (fr) Commutation dynamique entre une modulation cohérente et non cohérente pour une communication à faible latence ultra-fiable (urllc)

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07793310

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU

WWE Wipo information: entry into national phase

Ref document number: 12375840

Country of ref document: US

122 Ep: pct application non-entry in european phase

Ref document number: 07793310

Country of ref document: EP

Kind code of ref document: A1