公开(公告)号：KR1020130034723A

公开(公告)日：2013-04-08

申请号：KR1020110098747

申请日：2011-09-29

Applicant: 포항공과대학교 산학협력단

Inventor： 고재훈 ,  김치하

IPC: H04L27/26 ,  H04L1/00 ,  H04W16/14 ,  H04B7/26

CPC classification number: H04J11/00 ,  H04L1/004 ,  H04L27/0006 ,  H04W4/70

Abstract: PURPOSE: A recognition radio system and a data transmission method of the recognition radio system are provided to transmit and receive the data to a main user terminal without damage even when assistant user terminals using an OFDM(Orthogonal Frequency Division Multiplexing) sense different available frequency bands. CONSTITUTION: The recognition radio system(10) comprises a first assistant user terminal(100) and a second assistant user terminal(200). The first assistant user terminal transmits data to the second assistant user terminal by using a frequency band of a main user terminal. The second assistant user terminal receives the data from the first assistant user terminal by using the frequency band of the main user terminal. The first assistant user terminal comprises a radio communication unit, an encoding unit, and a controller. The radio communication unit senses a spectrum of the frequency band of the main user terminal. The encoding unit converts the data which are going to be transmitted into code words including a plurality of symbols by using a forward error correction method. A controller divides the spectrum sensed by controlling the radio communication unit into a plurality of subcarrier and transmits each symbol to the second assistant user terminal through the divided subcarrier. [Reference numerals] (100) First assistant user terminal; (200) Second assistant user terminal; (AA) Data transmission; (BB) CR system;

Abstract translation: 目的：提供识别无线电系统的识别无线电系统和数据传输方法，以便即使在使用OFDM（正交频分复用）的辅助用户终端感测不同的可用频带的情况下也可以向主用户终端发送和接收数据 。 构成：识别无线电系统（10）包括第一辅助用户终端（100）和第二辅助用户终端（200）。 第一辅助用户终端通过使用主用户终端的频带向第二辅助用户终端发送数据。 第二辅助用户终端通过使用主用户终端的频带从第一辅助用户终端接收数据。 第一辅助用户终端包括无线电通信单元，编码单元和控制器。 无线电通信单元感测主用户终端的频带的频谱。 编码单元通过使用前向纠错方法将要发送的数据转换为包括多个符号的码字。 控制器将通过控制无线电通信单元所感测的频谱划分为多个子载波，并通过分割的子载波将每个符号发送到第二辅助用户终端。 （附图标记）（100）第一辅助用户终端; （200）第二辅助用户终端; （AA）数据传输; （BB）CR系统;

公开(公告)号：KR1020120107295A

公开(公告)日：2012-10-02

申请号：KR1020110024901

申请日：2011-03-21

Applicant: 포항공과대학교 산학협력단

Inventor： 김치하 ,  이기석

IPC: H04W80/02 ,  H04B7/26 ,  H04W56/00

CPC classification number: H04B7/2612 ,  H04W56/0015

Abstract: PURPOSE: A ranking based medium access control method in a wireless network is provided to promote medium usage rates by reducing time overhead consumed in a medium access control process between nodes. CONSTITUTION: Each message transmission node transmits an individual beacon signal in a time slot corresponding to an ID(identification)(S210). Each message transmission node counts the number of beacon signals. Each message transmission node determines an order(S220). Each message transmission node is included in a message transmission node. Each message transmission node transmits messages according to the determined order(S30). [Reference numerals] (S10) Message transmission nodes synchronizes time with the end time of a synchronization beacon signal transmitted by an infrastructure apparatus; (S210) Each message transmission node in the message transmission nodes transmits own beacon signal in a time slot corresponding to ID of the entire time slots; (S220) Each message transmission node in the message transmission nodes determines orders by counting the number of beacon signals before the own beacon signal; (S230) Is a node which newly participates in message transmission existed?; (S240) Message transmission node which newly participates in the message transmission of message transmission nodes uses an ID by selecting ID corresponding to a time slot where beacon signals are not generated; (S250) Infrastructure apparatus optimizes ID filed length by searching ID field length which minimizes the whole wasting time including non-using wasting time and collision wasting time; (S30) Each message transmission node included in message transmission nodes transmits messages according to the determined orders; (S410) Is a node which terminates message transmission existed?; (S420) Message transmission node which terminates the message transmission deletes own ID

Abstract translation: 目的：提供无线网络中基于排序的媒体访问控制方法，以通过减少节点之间的媒体访问控制过程消耗的时间开销来提高媒体使用率。 构成：每个消息发送节点在与ID（识别）对应的时隙中发送单独的信标信号（S210）。 每个消息传输节点对信标信号的数量进行计数。 每个消息传输节点确定一个顺序（S220）。 每个消息传输节点包括在消息传输节点中。 每个消息传输节点根据确定的顺序发送消息（S30）。 （附图标记）（S10）消息发送节点将时间与由基础设施装置发送的同步信标信号的结束时间进行同步; （S210）消息发送节点中的每个消息发送节点在对应于整个时隙的ID的时隙中发送自己的信标信号; （S220）消息发送节点中的每个消息传输节点通过对自身信标信号之前的信标信号的数量进行计数来确定顺序; （S230）是否存在新参与消息传输的节点？ （S240）新参与消息发送节点的消息发送的消息发送节点通过选择与不生成信标信号的时隙对应的ID来使用ID; （S250）基础设施设备通过搜索最小化整个浪费时间的ID字段长度来优化ID字段长度，包括非使用浪费时间和冲突浪费时间; （S30）包含在消息发送节点中的每个消息发送节点根据确定的订单发送消息; （S410）是否存在终止消息传输的节点？ （S420）终止消息发送的消息发送节点删除自己的ID