公开(公告)号：KR1020100029027A

公开(公告)日：2010-03-15

申请号：KR1020090075789

申请日：2009-08-17

Applicant: 한국전자통신연구원

Inventor： 이현 ,  장성철 ,  임광재 ,  윤철식 ,  김남기

IPC: H04W36/08 ,  H04W36/02

CPC classification number: H04W36/0055

Abstract: PURPOSE: A handover method of a terminal and a terminal thereof eliminates a handover interruption time for the handover process of the terminal. In that way the communications service of the high quality is realized. CONSTITUTION: An MS(Mobile Station) transmits a handoff request message in the serving base station(S411). The target base station transmits the handover response message with the serving base station(S415). The terminal receives a message the handover response message from the serving base station. The terminal transmits and receives the serving base station and data with the first carrier(S418). The terminal is proceed the target base station and hand over signaling procedure with the second carrier wave(S422~S429).

Abstract translation: 目的：终端及其终端的切换方法消除了终端的切换处理的切换中断时间。 以这种方式实现了高质量的通信业务。 构成：MS（移动台）在服务基站发送切换请求消息（S411）。 目标基站与服务基站发送切换响应消息（S415）。 终端从服务基站接收到切换响应消息的消息。 终端用第一载波发送和接收服务基站和数据（S418）。 终端进行目标基站，并用第二载波转交信令程序（S422〜S429）。

公开(公告)号：KR1020090116624A

公开(公告)日：2009-11-11

申请号：KR1020090034637

申请日：2009-04-21

Applicant: 한국전자통신연구원

Inventor： 김성경 ,  임광재 ,  장성철 ,  윤철식

IPC: H04L1/18

CPC classification number: H04L1/1822 ,  H04L1/1893

Abstract: PURPOSE: A method and an apparatus for controlling retransmission are provided to retransmit HARQ bust in case of failure of HARQ bust transmission by mixing synchronous an HARQ(Hybrid Automatic Repeat reQuest) and asynchronous HARQ properly. CONSTITUTION: In a method and an apparatus for controlling retransmission, a retransmission control apparatus(100) is composed of a retransmission decision unit(110), a transmission unit(120), and receiver(130). The retransmission decision unit determines one mode of a synchronous retransmission and asynchronous synchronous retransmission as a retransmission mode. The receiver receives an ACK from the receiving terminal, and the transmission unit transmits new data to the receiving terminal. The receiver receives an NAK from the receiving terminal. The transmission unit transmits retransmission data according to a decision from the retransmission decision unit.

Abstract translation: 目的：提供一种用于控制重传的方法和装置，用于通过混合HARQ（混合自动重发请求）和异步HARQ的同步混合来重新发送HARQ中断发送失败的HARQ中断。 构成：在重发控制方法和装置中，重传控制装置（100）由重传判定部（110），发送部（120）和接收部（130）构成。 重传决定单元确定同步重传和异步同步重传的一种模式作为重传模式。 接收机从接收终端接收ACK，并且发送单元向接收终端发送新数据。 接收机从接收终端接收NAK。 发送单元根据来自重传决定单元的判定发送重发数据。

公开(公告)号：KR1020090031176A

公开(公告)日：2009-03-25

申请号：KR1020070128422

申请日：2007-12-11

Applicant: 한국전자통신연구원 ,  삼성전자주식회사

Inventor： 이현 ,  임광재 ,  김성경 ,  장성철 ,  차재선 ,  박철 ,  진성근 ,  조석헌 ,  권정민 ,  윤철식

IPC: H04B7/26 ,  H04L1/18 ,  H04L27/26

CPC classification number: H04W74/0833 ,  H04L1/1812 ,  H04L5/0007 ,  H04L5/0055 ,  H04W74/0866

Abstract: A signal transmitting method and a signal receiving method are provided to increase a yield of a random access channel by restricting the access to the random access channel depending on the availability of the random access channel and reduce a data transmission delay by simplifying a bandwidth allocation process. A base station(10) broadcasts a field of a high speed RAC signal as 0 for an available random access channel. A mobile station(20) selects a random access preamble code corresponding to a requested length and MCS(Modulation Coding Scheme) level among random access preamble code set, and chooses one of the random access channels which has a field of a high speed RAC signal as 0. The mobile station transmits the selected preamble code and a random access message to the base station. If the base station is unable to receive the random access preamble code and the random access message, the base station broadcasts as a field of a high speed RAC signal as 0 without a random access response of a random access channel. When the mobile station receives the field of a high speed RAC signal as 0, performs a bandwidth request ranging procedure to transmit data or selects another random access channel to retransmit a random access data.

Abstract translation: 提供信号发送方法和信号接收方法，以通过根据随机接入信道的可用性限制对随机接入信道的接入，通过简化带宽分配处理来减少数据传输延迟来增加随机接入信道的收益 。 基站（10）向可用随机接入信道广播高速RAC信号的字段为0。 移动站（20）在随机接入前导码集合中选择对应于所请求长度的随机接入前导码和MCS（调制编码方案）级别，并选择具有高速RAC信号字段的随机接入信道之一 移动台向基站发送所选择的前导码和随机接入消息。 如果基站不能接收到随机接入前导码和随机接入消息，则基站作为0的高速RAC信号的字段广播，而不随机接入信道的随机接入响应。 当移动站接收到高速RAC信号的场为0时，执行带宽请求测距过程以发送数据或选择另一个随机接入信道来重传随机接入数据。

公开(公告)号：KR100830537B1

公开(公告)日：2008-05-21

申请号：KR1020060122859

申请日：2006-12-06

Applicant: 한국전자통신연구원 ,  삼성전자주식회사

Inventor： 임광재 ,  이현 ,  서민식 ,  윤철식 ,  박철

IPC: H04B7/26

CPC classification number: H04L1/0056 ,  H04W72/0413 ,  H04W76/10

Abstract: A method and an apparatus for initial access in a communication system are provided to select modulating and encoding methods and perform resource allocation properly according to the size of a data packet in an initial arbitrary access process, thereby improving efficiency in a use for wireless resources and reducing an access delay time. A method for initial access in a communication system comprises the following steps of: allowing an MS(Mobile Station)(100) to transmit an initial ranging signal to a BS(Base Station)(200) for attempting access to a network initially; allowing the BS to estimate a sub set, to which a code belongs, from the code included in the ranging signal(S120); allowing the BS to check a transmission power level used in the MS and the request bandwidth level of the MS(S130); allowing the BS to compare the transmission power level used in the MS with the receiving power level of the received code and estimate a transmission loss between the MS and the BS(S140); allowing the BS to determine modulating and coding methods used in the MS(S150); allowing the BS to determine a transmission method and uplink resources allocated to the MS and notify the MS of the determined transmission method and the uplink resources through a downlink MAP(Media Access Point)(S160); and allowing the MS to transmit a data packet to the BS by using uplink resources allocated by the determined transmission method(S170).

Abstract translation: 提供一种在通信系统中初始接入的方法和装置，用于选择调制和编码方法，并根据初始任意接入过程中数据包的大小正确执行资源分配，从而提高无线资源使用效率， 减少访问延迟时间。 一种用于通信系统中的初始接入的方法包括以下步骤：允许MS（移动台）（100）向BS（基站）（200）发送初始测距信号以用于最初尝试接入网络; 允许BS从包括在测距信号中的代码估计代码所属的子集（S120）; 允许BS检查MS中使用的发送功率电平和MS的请求带宽水平（S130）; 允许BS将MS中使用的发射功率水平与接收到的码的接收功率电平进行比较，并估计MS与BS之间的传输损耗（S140）; 允许BS确定在MS中使用的调制和编码方法（S150）; 允许BS确定分配给MS的传输方法和上行资源，并通过下行MAP（媒体接入点）通知MS确定的传输方法和上行链路资源（S160）; 并且允许MS通过使用由所确定的传输方法分配的上行链路资源向BS发送数据分组（S170）。

公开(公告)号：KR1020080005058A

公开(公告)日：2008-01-10

申请号：KR1020070011014

申请日：2007-02-02

Applicant: 한국전자통신연구원 ,  삼성전자주식회사

Inventor： 임광재 ,  윤철식

IPC: H04B7/26 ,  H04L27/26 ,  H04L1/18 ,  H04B7/04

CPC classification number: H04L1/0003 ,  H04L2001/0093 ,  H04W4/08 ,  H04W72/042

Abstract: A method for allocating a terminal to a group in the BS of a communication system and a map generating method are provided to reduce the number of bits consumed in radio resource allocation signaling for plural small packets by the allocation of the group and to be capable of multiple input/output and a hybrid automatic repetition request in uplink. A method for allocating a terminal to a group in the BS(Base Station) of a communication system comprises the following steps of: receiving the channel state information of the terminal(S210); designating the group which the terminal will belong to according to the channel state information(S220); and transmitting a map including first allocation information for the group to the terminal(S240). The first allocation information includes the identifier of the group and the radio resource information of a group burst.

Abstract translation: 提供一种将终端分配给通信系统的BS中的组和地图生成方法的方法，以通过该组的分配来减少多个小分组的无线电资源分配信令中消耗的比特数，并且能够 多输入/输出和上行链路中的混合自动重复请求。 一种将终端分配给通信系统的基站（基站）中的组的方法包括以下步骤：接收终端的信道状态信息（S210）; 根据信道状态信息指定终端将属于的组（S220）; 以及向所述终端发送包括所述组的第一分配信息的映射（S240）。 第一分配信息包括组的标识符和组突发的无线资源信息。

公开(公告)号：KR100788901B1

公开(公告)日：2007-12-27

申请号：KR1020060095518

申请日：2006-09-29

Applicant: 한국전자통신연구원

Inventor： 임광재 ,  김성경 ,  윤철식 ,  안지환

IPC: H04B7/26

CPC classification number: H04W74/0866 ,  H04W28/20 ,  H04W74/0833

Abstract: A random access channel operation method in a mobile communication system is provided to enable a base station to dynamically change a transmission type according to a load degree by measuring a load of a random access channel, thereby increasing a usage rate of the random access channel as preventing additional delay. A transmission mode is selected according to a load of a random access channel, and the selected mode is transmitted to a portable terminal(S610). At this time, the load measurement is performed based on the measurement of NI(Noise and Interference). A message having a format corresponding to the selected transmission mode is received from the portable terminal(S620). It is decided whether the received message includes a preamble or data(S640,S650). If data only or both data and preamble is or are included in the message, a response message for data reception is transmitted to the portable terminal(S653,S655,S690).

Abstract translation: 提供了一种移动通信系统中的随机接入信道操作方法，以使得基站能够通过测量随机接入信道的负载来根据负载程度动态地改变发送类型，从而将随机接入信道的使用率提高为 防止额外的延迟。 根据随机接入信道的负载选择发送模式，将所选择的模式发送到便携式终端（S610）。 此时，基于NI（噪声和干扰）的测量来进行负载测量。 从便携式终端接收具有与选择的发送模式对应的格式的消息（S620）。 确定所接收的消息是否包括前导码或数据（S640，S650）。 如果消息中仅包括数据或前导数据或数据，则将用于数据接收的响应消息发送到便携式终端（S653，S655，S690）。

公开(公告)号：KR1020070119474A

公开(公告)日：2007-12-20

申请号：KR1020060124572

申请日：2006-12-08

Applicant: 한국전자통신연구원

Inventor： 김성경 ,  임광재 ,  윤철식 ,  안지환

IPC: H04B7/26 ,  H04L29/02 ,  H04L12/28

CPC classification number: H04W28/26 ,  H04W56/0075 ,  H04B7/2628

Abstract: An uplink synchronization request method in a mobile communication system, a CDMA(Code Division Multiple Access) allocation IE(Information Element) structure in accordance with the method, and a device therefor are provided to enable a PSS(Portable Subscriber Station) to calculate uplink synchronization timing and to synchronize uplink, thereby magnifying resource usage efficiency used for the uplink synchronization. If uplink traffic exists, it is decided whether an uplink synchronization error exists(S820,S830). If so, a timing adjustment value is calculated(S840). A bandwidth request code including the calculated timing adjustment value is transmitted to an RAS(Radio Access Station), so that a bandwidth request is carried out(S850). Before performing the steps 'S820,S830', initial ranging with the RAS is performed, and an initial timing value is stored(S810).

Abstract translation: 提供移动通信系统中的上行链路同步请求方法，根据该方法的CDMA（码分多址）分配IE（信息元素）分配结构及其装置，以使PSS（便携式用户站）能够计算上行链路 同步定时和同步上行链路，从而放大了用于上行链路同步的资源使用效率。 如果上行流量存在，则判定是否存在上行链路同步错误（S820，​​S830）。 如果是，则计算定时调整值（S840）。 将包括计算出的定时调整值的带宽请求码发送到RAS（无线接入站），从而进行带宽请求（S850）。 在执行步骤S820，​​S830之前，执行与RAS的初始测距，并存储初始定时值（S810）。

公开(公告)号：KR100729727B1

公开(公告)日：2007-06-18

申请号：KR1020060000924

申请日：2006-01-04

Applicant: 한국전자통신연구원 ,  삼성전자주식회사 ,  에스케이브로드밴드주식회사 ,  에스케이텔레콤 주식회사 ,  주식회사 케이티

Inventor： 임광재 ,  윤철식

IPC: H04B1/7097

Abstract: 본 발명은 OFDMA 이동통신 시스템에서의 간섭을 제거하는 수신 방법 및 장치에 관한 것이다.
이를 위하여 본 발명은 이동 단말기가 인접 기지국 및 원거리 기지국의 간섭 신호가 포함된 데이터 신호가 실려있는 부반송파를 서비스 기지국으로부터 수신하고, 부반송파 중 주파수 축 또는 시간 축 상에서 인접한 하나 이상의 파일롯 부반송파를 이용하여, 서비스 기지국과 인접 기지국에 대한 채널 응답을 추정한 뒤, 간섭 신호의 제거를 위한 가중치를 계산하고, 계산된 가중치를 이용하여 수신된 부반송파 중 반복되는 동일 데이터 심볼을 갖는 하나 이상의 데이터 부반송파를 합성함으로써, 간섭 신호가 제거된 데이터 심볼을 산출하는 간섭 제거 수신 방법을 제공한다.
본 발명에 의하면, 서비스 기지국 신호에 대한 수신 성능을 향상시킬 수 있어 주파수를 재사용 및 시스템 용량 증대가 가능하며, 핸드오프 상황에서도 서비스 기지국 및 인접 기지국으로부터의 신호를 성공적으로 복조할 수 있어 핸드오프 성공률을 높이고 핸드오프 지연 시간을 감소시킬 수 있다.
간섭 제거, 단일 안테나, 반복 전송, OFDMA

公开(公告)号：KR1020060043279A

公开(公告)日：2006-05-15

申请号：KR1020050016809

申请日：2005-02-28

Applicant: 한국전자통신연구원 ,  아주대학교산학협력단

Inventor： 오성근 ,  이문일 ,  이승준 ,  예충일 ,  임형수 ,  최인경 ,  오종의 ,  임광재 ,  김성락 ,  송영석 ,  이유로 ,  권동승 ,  황승구

IPC: H04B7/02 ,  H04B7/04

CPC classification number: H04B7/02 ,  H04B7/0697 ,  H04L1/0612 ,  H04B7/0656

Abstract: 본 발명은 구조적인 시공간 부호 및 그 생성 방법과, 그 시공간 부호를 사용한 다중 안테나 시스템에 관한 것이다. 이 시공간 부호는 하나의 블록구간 동안 송신기의 안테나 개수와 공간 다중화율의 곱에 해당하는 심벌들을 전송하도록 송신기의 안테나 개수에 해당하는 크기의 정방행렬인 부호어 행렬－여기서 부호어 행렬의 행(row)은 송신기의 안테나별로 전송되는 결합된 신호들을 나타내고, 부호어 행렬의 열(column)은 송신기의 안테나 개수에 해당하는 타임슬롯을 나타냄－을 가진다. 이 부호어 행렬은 타임슬롯마다 각 송신 안테나가 전송하도록 할당되는 심벌의 개수는 공간 다중화율에 해당하는 개수이고, 각 송신 안테나에 할당된 심벌들은 서로 다른 결합 계수들에 의해 결합되어 각 송신 안테나에 의해 동시에 전송되며, 각 송신 안테나에는 타임슬롯마다 서로 다른 심벌들이 할당되도록 결정된다. 본 발명에 따르면, 최소의 지연을 가지므로 채널변화에 효과적으로 대처할 수 있고, 타임슬롯별 안테나별로 최소의 데이터 심벌의 조합으로 신호가 생성되므로 신호들 간의 유클리디언 거리가 커서 높은 부호화 이득을 얻을 수 있다.
시공간 부호, STC, time space code, 다중 안테나 시스템, 공간 다중화율

Abstract translation: 本发明涉及结构空时码，用于生成空时码的方法以及使用该空时码的多天线系统。 空间 - 时间码是在发射器和空间复用率乘以码字矩阵的平方矩阵，其中的一个发射机的天线数来发送码元的过尺寸的天线的块周期数 - 其中所述码字矩阵的行（行 表示由发射机的天线发送的组合信号，并且码字矩阵的列表示与发射机的天线的数量相对应的时隙。 码字矩阵是被分配给针对每个时隙传送每个发射天线的符号的数目是对应于所述空间复用率的数量，由符号组合是不同的耦合系数被分配给每个发送天线的每个发送天线 并且确定对于每个时隙将不同的符号分配给每个发射天线。 根据本发明，因为最小延迟，以有效地进行信道改变响应，以及时隙天线作为信号的通过组合生成的数据码元的最小数量是信号的光标之间的欧几里德距离，以获得用于每个特定高的编码增益 有。

公开(公告)号：KR100461537B1

公开(公告)日：2004-12-17

申请号：KR1020020074480

申请日：2002-11-27

Applicant: 한국전자통신연구원

Inventor： 임광재 ,  김수영 ,  오덕길

IPC: H04B7/204 ,  H04W84/06

CPC classification number: H04B7/2041 ,  H04B7/216

Abstract: Provided are a packet transmission method for transmitting packets in a forward link of a multibeam satellite communication system and a computer-readable recording medium for recording a program that implements the method. The packet transmission method transmitting packets to mobile stations in a forward link of a multibeam satellite communication system, comprising the steps of: wherein downlink beams of a satellite share an orthogonal spreading code set for transmitting packets to the mobile stations, a) generating downlink beam signals by using an identical structure for the radio frames transmitted through the downlink beams and an identical pseudo-noise (PN) scrambling code for generating downlink beam signals; and b) synchronizing transmission timings of frames, symbols and spread chips on the downlink beam signals.

Abstract translation: 提供了一种用于在多波束卫星通信系统的前向链路中发送分组的分组传输方法以及用于记录实现该方法的程序的计算机可读记录介质。 在多波束卫星通信系统的前向链路中向移动站发送分组的分组传输方法包括以下步骤：其中卫星的下行波束共享用于向移动站发送分组的正交扩展码集，a）产生下行链路波束 信号通过使用相同的结构用于通过下行链路波束发送的无线电帧和用于产生下行链路波束信号的相同的伪噪声（PN）扰码; 和b）在下行链路波束信号上同步帧，码元和扩展码片的传输定时。