公开(公告)号：KR1020130109045A

公开(公告)日：2013-10-07

申请号：KR1020130030015

申请日：2013-03-20

Applicant: 한국전자통신연구원

Inventor： 김정현 ,  김지형 ,  김현재 ,  임광재 ,  권동승

IPC: H04W56/00

CPC classification number: H04W56/001 ,  H04W56/0035

Abstract: PURPOSE: A frequency synchronization method in a distributed network is provided to synchronize a carrier frequency of a node which enters a distributed network with a carrier frequency of the network which the node has entered by adjusting the carrier frequency of the node. CONSTITUTION: Preambles are received from a plurality of nodes which are adjacent to a node (S301). A carrier frequency offset of each node is estimated from the preambles (S302). The average of the estimated offsets is calculated (S304). An adjustment value of the carrier frequency of the whole adjacent nodes is calculated by using the average value (S308). A carrier frequency of the node is adjusted based on the adjustment value. [Reference numerals] (AA) No; (BB) Yes; (S301) Preamble reception; (S302) Frequency offset estimation for each neighboring node; (S303) Preamble reception number > R_th; (S304) Average frequency offset value {tilde over (f)}_i,m (k) calculation; (S305) {tilde over (f)}_i,m (k) calculation number (N_δ_i,m (k)) update; (S306) N_δ_n,l (k-1) and q_n,i (k-1) reception; (S307) Final frequency offset value ({circumflex over (f)}_i,m (k)) calculation; (S308) Carrier wave adjustment value (Δf_i (k)) calculation & adjustment; (S309) Carrier wave adjustment request value (q_i,n (k)) calculation; (S310) N_δ_i,n (k) and q_i,n (k) reception

Abstract translation: 目的：提供分布式网络中的频率同步方法，通过调整节点的载波频率，将进入分布式网络的节点的载波频率与节点已进入的网络的载波频率进行同步。 构成：从与节点相邻的多个节点接收前导码（S301）。 从前导码估计每个节点的载波频率偏移（S302）。 计算估计偏移的平均值（S304）。 通过使用平均值来计算整个相邻节点的载波频率的调整值（S308）。 基于调整值调整节点的载波频率。 （附图标记）（AA）否; （BB）是的; （S301）前导码接收; （S302）每个相邻节点的频率偏移估计; （S303）前导码接收号码> R_th; （S304）平均频率偏移值{（t）），（i），（k）计算; （S305）{tilde over（f）} _ i，m（k）计算号（N_δ_i，m（k））更新; （S306）N_δ_n，l（k-1）和q_n，i（k-1）接收; （S307）最终频率偏移值（{f（f）} _ i，m（k））计算; （S308）载波调整值（Δf_i（k））计算和调整; （S309）载波调整请求值（q_i，n（k））计算; （S310）N_δ_i，n（k）和q_i，n（k）接收

公开(公告)号：KR1020130063916A

公开(公告)日：2013-06-17

申请号：KR1020110130539

申请日：2011-12-07

Applicant: 한국전자통신연구원

Inventor： 이안석 ,  신우람 ,  김현재 ,  임광재 ,  권동승

IPC: H04W40/12

CPC classification number: H04W40/12 ,  H04L45/302 ,  H04L45/54

Abstract: PURPOSE: A routing method in a wireless communication system is provided to search for a transmission path requesting different quality by using a routing matrix comprising various type quality articles by using the quality of a link and a node. CONSTITUTION: A data demand performance confirmation unit measures the quality of a node and links facing to neighbor nodes. A path determination unit determines a path customized at the performance demand characteristic of data transmitted by using a routing matrix(S1030). The routing matrix comprises one or more quality articles by using the quality of the node and the quality of the links. The path determination unit transmits data by referring to the path(S1040). [Reference numerals] (S1010) Receive data to be transmitted; (S1020) Determine a service flow to which the data to be transmitted is belonged to; (S1030) Deduce the path to a last destination of the data to be transmitted using a routing table; (S1040) Transmit data to the next hop mesh node of the deduced path

Abstract translation: 目的：提供无线通信系统中的路由方法，通过使用链路和节点的质量，通过使用包括各种类型质量文章的路由矩阵来搜索请求不同质量的传输路径。 规定：数据需求性能确认单元测量节点和面向邻居节点的链路的质量。 路径确定单元确定通过使用路由矩阵发送的数据的性能需求特性定制的路径（S1030）。 路由矩阵通过使用节点的质量和链路的质量来包括一个或多个优质的文章。 路径确定单元通过参照路径发送数据（S1040）。 （附图标记）（S1010）接收要发送的数据; （S1020）确定要发送的数据所属的业务流; （S1030）使用路由表推导要发送的数据的最后目的地的路径; （S1040）将数据发送到推导路径的下一跳网格节点

公开(公告)号：KR1020130015800A

公开(公告)日：2013-02-14

申请号：KR1020110078036

申请日：2011-08-05

Applicant: 한국전자통신연구원

Inventor： 이안석 ,  김현재 ,  임광재 ,  이혁준

IPC: H04W40/12 ,  H04W40/24 ,  H04W84/18

CPC classification number: H04W40/12 ,  H04L45/24 ,  H04L45/302 ,  H04W40/24 ,  H04W84/18

Abstract: PURPOSE: A multi-path quality of service routing method in a wireless mesh network is provided to restore and select a path by using an RREQ(Route REQuest) message, an RREP(Route ResPonse) message, and an RERR(Route ERRor) message. CONSTITUTION: The reliability of paths is compared from each other in nodes. Each of the nodes selects a main path and one or more alternative paths(S520). Each of the nodes determines the priority of the paths based on the reliability(S530). Each of the nodes stores the main path, and the alternative path, and the priority in a routing table(S540). When the main path is disconnected, the disconnected node deletes the main path in the routing table(S560). The disconnected node modifies a posterior ranking path to the main path based on the priority. [Reference numerals] (AA) Disconnection of the main path is occurs; (BB) No; (CC) Yes; (S510) Searching paths satisfying QoS which is required by application services; (S520) Selecting a main path and alternative paths; (S530) Determining the priority of the paths; (S540) Storing the main path, alternative paths, and priority in a routing table; (S550) Transmitting packets through the main path; (S560) Deleting the main path from the routing table and modifying a posterior ranking path to the main path

Abstract translation: 目的：提供无线网状网络中的多路径服务质量路由方法，通过使用RREQ（Route REQuest）消息，RREP（Route ResPonse）消息和RERR（Route ERRor）消息来恢复和选择路径 。 规定：路径的可靠性在节点中相互比较。 每个节点选择主路径和一个或多个备选路径（S520）。 每个节点基于可靠性确定路径的优先级（S530）。 每个节点存储路由表中的主路径和替代路径以及优先级（S540）。 当主路径断开时，断开的节点删除路由表中的主路径（S560）。 断开的节点基于优先级修改到主路径的后向路径。 （附图标记）（AA）发生主路径的断开; （BB）否 （CC）是; （S510）应用服务所要求的满足QoS的搜索路径; （S520）选择主路径和替代路径; （S530）确定路径的优先级; （S540）在路由表中存储主路径，备用路径和优先级; （S550）通过主路径发送数据包; （S560）从路由表中删除主路径，修改主路径的后级路径

公开(公告)号：KR1020120125691A

公开(公告)日：2012-11-19

申请号：KR1020110043283

申请日：2011-05-09

Applicant: 한국전자통신연구원

Inventor： 신우람 ,  김현재 ,  임광재 ,  권동승

IPC: H04L1/18 ,  H04L27/26 ,  H04W84/18

CPC classification number: H04L1/1812 ,  H04L27/26 ,  H04W84/18

Abstract: PURPOSE: An apparatus and method for feedback in a wireless mesh system are provided to reduce overheads by providing an HARQ(hybrid automatic repeat request) feedback channel for the wireless mesh system. CONSTITUTION: Data is received in a first sub frame. An HFBCH(HARQ feedback channel) is selected to transmit ACK/NACK(acknowledgement/not-acknowledgement) of the data in a second sub frame corresponding to the first sub frame. The ACK/NACK of the data is transmitted in the selected HFBCH. The HFBCH which can be transmitted from the second sub frame has a mapping relation with an LRU(logical resource unit) of the first sub frame. The first sub frame and the second sub frame are included in a frame which can transmit scheduling information and the data.

Abstract translation: 目的：提供一种用于无线网状系统中的反馈的装置和方法，以通过为无线网状系统提供HARQ（混合自动重复请求）反馈信道来减少开销。 规定：在第一个子帧中接收数据。 选择HFBCH（HARQ反馈信道）以在对应于第一子帧的第二子帧中发送数据的ACK / NACK（确认/不确认）。 在所选择的HFBCH中发送数据的ACK / NACK。 可以从第二子帧发送的HFBCH与第一子帧的LRU（逻辑资源单元）具有映射关系。 第一子帧和第二子帧被包括在可以发送调度信息和数据的帧中。

公开(公告)号：KR1020120115619A

公开(公告)日：2012-10-19

申请号：KR1020110033029

申请日：2011-04-11

Applicant: 한국전자통신연구원 ,  연세대학교 산학협력단

Inventor： 김현재 ,  임광재 ,  정종문 ,  이대영 ,  박종홍

IPC: H04W40/12 ,  H04W84/18 ,  H04J11/00

CPC classification number: H04W40/12 ,  H04W40/38 ,  H04W84/18

Abstract: PURPOSE: A communication method in a wireless mesh network and an apparatus supporting the same are provided to increase the performance of a capacitor and improve a BER(bit error rate) of a link by minimizing MUI(multi-user interference) of a wireless mesh network based on OFDMA(orthogonal frequency-division multiple access). CONSTITUTION: The number of the other nodes is obtained(S750). A cost parameter is obtained based on BER, a capacitor, and the number of nodes(S760). A weight factor is applied to the cost parameter. The weighted link cost parameter is obtained(S770). A routing path is set up based on the minimum cost routing algorithm(S790). [Reference numerals] (S710) Measuring d_ij between nodes; (S730) SINR calculation on a receipt terminal; (S740) Link BER calculation; (S750) Measuring the number of neighboring node; (S760) Obtaining a cost parameter; (S770) Calculating weighted link cost; (S780) Determining cost between nodes?; (S790) Setting up an optimum routing path by using a Minimum cost routing algorithm

Abstract translation: 目的：提供无线网状网络中的通信方法和支持该无线网状网络的装置，以通过最小化无线网格的MUI（多用户干扰）来提高电容器的性能并提高链路的BER（误码率） 基于OFDMA（正交频分多址）网络。 构成：获得其他节点的数量（S750）。 基于BER，电容器和节点数获得成本参数（S760）。 对成本参数应用权重因子。 获得加权链路成本参数（S770）。 基于最小成本路由算法建立路由路径（S790）。 （参考号）（S710）在节点之间测量d_ij; （S730）收据终端的SINR计算; （S740）链路BER计算; （S750）测量相邻节点的数量; （S760）获取成本参数; （S770）计算加权链路成本; （S780）确定节点之间的成本？ （S790）使用最低成本路由算法设置最优路由路径

公开(公告)号：KR1020100048901A

公开(公告)日：2010-05-11

申请号：KR1020090102497

申请日：2009-10-27

Applicant: 한국전자통신연구원 ,  삼성전자주식회사

Inventor： 김은경 ,  김주희 ,  김현재 ,  김경수

IPC: H04W52/02 ,  H04L27/26

CPC classification number: H04W52/0229 ,  H04L5/001 ,  H04L5/008 ,  H04L5/0098 ,  H04L5/02 ,  H04L27/2601 ,  H04W36/24 ,  H04W52/0206 ,  H04W52/0216 ,  H04W72/042 ,  H04W72/0453 ,  Y02D70/20

Abstract: PURPOSE: An apparatus and a method for managing multi-carriers and a method for operating a sleep mode of a terminal are provided to use a wireless resource efficiently by reducing a message transmission load of a base station and managing the multi-carriers efficiently. CONSTITUTION: A communication unit(214) requests the change of a main carrier from a first terminal which will enter a sleep mode. A control message is transmitted through the main carrier during the sleep mode. The control message includes a traffic indication message, and a sub-carrier selection unit(212) selects the sub-carrier which is commonly used by the first or second terminals which is larger than the other.

Abstract translation: 目的：提供一种用于管理多载波的装置和方法以及用于操作终端的休眠模式的方法，以通过减少基站的消息传输负载并有效管理多载波来有效地使用无线资源。 构成：通信单元（214）请求从将进入睡眠模式的第一终端改变主载波。 在睡眠模式期间通过主载波传输控制消息。 控制消息包括业务指示消息，子载波选择单元（212）选择第一或第二终端通常使用的副载波大于另一终端。

公开(公告)号：KR100943177B1

公开(公告)日：2010-02-19

申请号：KR1020070124877

申请日：2007-12-04

Applicant: 한국전자통신연구원

Inventor： 김현재 ,  오정훈 ,  문영진 ,  이용수 ,  김은경 ,  김영일

IPC: H04B7/14 ,  H04B7/26

Abstract: 본 발명은 단말의 대역폭 요구 및 할당 절차를 효율적으로 관리하기 위해 중계국(Relay station: RS)을 이용한 통신 방법 및 시스템을 개시한다.
본 발명은 RS 영역 내에 존재하는 MS에 대해 BR 코드가 MR-BS로 직접 전송하는 경우를 고려하여 RS 시스템을 2가지 모드로 동작시킴으로써 기존 규격을 만족함과 동시에 시스템 성능 향상을 얻을 수 있다. 또한 MR-BS와 MS 간의 호 처리 절차를 RS가 직접 모니터링함으로써 여러 단계의 MR-BS와 RS 간 메시지 절차를 제거하여 단순화하여 시간적 지연에 민감한 서비스에 대해 효과적으로 사용가능하다.

公开(公告)号：KR1020090056768A

公开(公告)日：2009-06-03

申请号：KR1020080016934

申请日：2008-02-25

Applicant: 한국전자통신연구원

Inventor： 김은경 ,  김현재 ,  김경수

IPC: H04L12/28 ,  H04B7/26

CPC classification number: H04W72/0406 ,  H04W84/047 ,  H04B7/2606 ,  H04B7/2628

Abstract: A ranging method in a mobile communication system and a relay station to which the method is applied are provided to improve the ranging efficiency by requesting information about a ranging code and a resource at a time in the centralized scheduling of a BS(Base Station). A ranging code checker(300) grasps states of ranging codes received from a mobile station. If the states of some of the ranging codes are in the continuous state or stopped state, a message generator(310) produces a message for requesting a CDMA(Code Division Multiple Access) assignment information element and a band. A message transmitter(320) transmits the generated message to a base station. A message receiver(330) receives the band for transmitting a ranging response message correspondingly to the request message and then receives an uplink map including the CDMA assignment information element.

Abstract translation: 提供移动通信系统中的测距方法和应用该方法的中继站，以通过在BS（基站）的集中式调度中一次请求关于测距码和资源的信息来提高测距效率。 测距码检查器（300）掌握从移动台接收的测距码的状态。 如果一些测距码的状态处于连续状态或停止状态，则消息产生器（310）产生用于请求CDMA（码分多址）分配信息单元和频带的消息。 消息发送器（320）将生成的消息发送到基站。 消息接收机（330）接收与所述请求消息对应的用于发送测距响应消息的频带，然后接收包括CDMA分配信息单元的上行链路映射。

公开(公告)号：KR100836624B1

公开(公告)日：2008-06-10

申请号：KR1020060124508

申请日：2006-12-08

Applicant: 한국전자통신연구원 ,  삼성전자주식회사

Inventor： 문영진 ,  김현재 ,  김기석 ,  김영일

IPC: G06F17/14

CPC classification number: G06F17/142

Abstract: A variable FFT(Fast Fourier Transform) device and a method thereof are provided to enable a multi-frequency allocation MBS(Mobile Base Station) requiring a variable FFT hardware engine to offer a variable multi-output FFT hardware structure supporting an efficient multi-frequency allocation system by using various combinations with minimum hardware requirement. Two 4-point FFT processors(500,500') perform FFT by selecting an FFT rotation coefficient for 4-point input or double 4-point input. An input sequence arranger(400) classifies and inputs the double 4-point FFT input alternatively to two 4-point FFT processors. A Radix-2 butterfly operator(700) performs a butterfly operation by receiving the double 4-point input from two 4-point FFT processor. A second output sequence arranger(600) arranges an output sequence by receiving output from the Radix-2 butterfly operator. The 4-point FFT processor includes a first storing part storing the rotation coefficient for the 4-point input, a second storing part storing the rotation coefficient for the double 4-point input, and a multiplexer selecting the rotation coefficient of the first or second storing part depending on the 4-point input or the double 4-point input.

Abstract translation: 提供了一种可变FFT（快速傅里叶变换）装置及其方法，使得能够使需要可变FFT硬件引擎的多频分配MBS（移动基站）能够提供可变的多输出FFT硬件结构，其支持有效的多频 分配系统通过使用最低硬件要求的各种组合。 两个4点FFT处理器（500,500'）通过选择4点输入或双4点输入的FFT旋转系数来执行FFT。 输入序列整理器（400）将两个4点FFT输入交替分类并输入到两个4点FFT处理器。 Radix-2蝶形运算符（700）通过从两个4点FFT处理器接收双重4点输入来执行蝶形运算。 第二输出序列编排器（600）通过接收基数-2蝶形运算符的输出来布置输出序列。 4点FFT处理器包括存储用于4点输入的旋转系数的第一存储部分，存储双重4点输入的旋转系数的第二存储部分和选择第一或第二输入的旋转系数的多路复用器 根据4点输入或双4点输入存储部分。

公开(公告)号：KR100749414B1

公开(公告)日：2007-08-14

申请号：KR1020050121337

申请日：2005-12-10

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

Inventor： 오정훈 ,  김현재 ,  김영일

IPC: H04L9/06 ,  H04L12/28 ,  H04L9/18 ,  H04L9/28

Abstract: 무선 인터넷 시스템의 암호화 장치에서는 서비스별 특성에 따라 CCM(Counter with CBC-MAC) 모드 또는 CTR 모드로 동작할 수 있도록 두 개의 암호부를 포함한다. 이때, 개인 데이터 서비스와 같이 보안성이 요구되는 서비스의 경우에는 두 개의 암호부 중 하나는 CBC 모드의 암호화를 수행하고 나머지 하나는 CTR 모드의 암호화를 수행하며, 방송용 서비스와 같이 고속 대용량의 서비스의 경우에는 두 개의 암호부 모두 CTR 모드의 암호화를 수행한다. 복호화 장치에서도 서비스별 특성에 따라 CCM 모드 또는 CTR 모드로 동작할 수 있도록 두 개의 복호부를 포함한다. 이때, 개인 데이터 서비스와 같이 보안성이 요구되는 서비스의 경우에는 두 개의 복호부 중 하나는 CBC 모드의 복호화를 수행하고 나머지 하나는 CTR 모드의 복호화를 수행하며, 방송용 서비스와 같이 고속 대용량의 서비스의 경우에는 두 개의 복호부 모두 CTR 모드의 암호화를 수행한다. 이렇게 함으로써, 서비스 모듈을 별도로 구현하지 않아도 방송용 서비스와 개인 데이터 서비스를 하나의 암호화 장치/복호화 장치에서 암호화/복호화를 수행할 수 있다.
암호화, 복호화, CCM, CTR, CBC, MAC, 암호문, 평문, 복호문