Abstract:
Disclosed is a method for allocating and accessing downlink resources in the OFDMA communication system. In the resource allocation method, bursts having the same modulation and channel encoding level are arranged in a predetermined temporal order on a physical layer. Information on the allocated unit resources is included in a common control block and is transmitted to a subscriber station, and the subscriber station then detects a number of the allocated unit resources to thus check the range of bursts to be received by the subscriber station. Therefore, power consumption by the subscriber station is reduced and signaling overheads of the common control information and unneeded residual resources are decreased.
Abstract:
본 발명은 프리앰블 기반의 대역폭 요청 방법에 관한 것이다. 본 발명에 따르면 프리앰블을 사용하여 대역폭을 요청하는 휴대 인터넷 시스템에서 이동 단말의 상태를 가장 최근의 환경에 따라 상태조절하도록 함으로써 보다 효율적으로 사용자 데이터의 전송이 가능하도록 한다. 또한, 본 발명에 따르면 프리앰블을 사용하여 대역폭 요청 시도를 하였을 때, 기지국이 해당 프리앰블을 전송한 단말을 식별하기 위한 정보를 그 단말에 대한 상태조절 정보와 함께 임시 커넥션 식별자로서 다음 번 해당 단말과의 데이터 전송시 단말을 구분하도록 한다.
Abstract:
PURPOSE: A method and apparatus for allocating radio resources in a wireless mobile Internet system are provided to lower power consumption of mobile terminal and increase use efficiency of a battery thereof. CONSTITUTION: A base station recognizes radio channel characteristics of downlink(S10). The base station determines adaptive modulation and a channel coding level according to the recognized radio channel characteristics(S11). The base station allocates radio resource corresponding to the modulation and the coding level(S12). The base station generates subscriber information with respect to the allocated radio resource and maps it to a common control information block(S13). The base station transmits packet data in a frame format to downlink(S14).
Abstract:
PURPOSE: A system for controlling a power save mode in a wireless mobile Internet system and a method therefor are provided to reduce complexity of a system and facilitate its management by grouping management of subscriber terminals and collectively controlling them. CONSTITUTION: A message receiver(210) receives a sleep mode request message from a subscriber terminal. A message analyzer(220) analyzes the sleep mode request message and extracts a minimum sleep period, a maximum sleep period and a subscriber terminal ID. A grouping controller(240) determines a sleep mode entering point of the subscriber terminal which has requested the sleep mode based on the minimum sleep period and the maximum sleep period in order to group listening periods of a plurality of subscriber terminals. A memory unit(260) stores sleep mode information of the grouped subscriber terminal. A message transmitter(280) informs the sleep mode-requested subscriber terminal about the minimum sleep period, the maximum sleep period and the sleep mode entering point.
Abstract:
PURPOSE: A call acceptance control method of a mobile communication system having a hierarchy structure and a recording medium storing the same are provided to discriminately accept a call by types in restricted radio resource environment of a micro cell and a macro cell. CONSTITUTION: When the number of new calls in call communication in a micro cell(102) is Cn or the total number of calls in communication is 'c', a new call request by a low speed mobile terminal in the micro cell(102) is rejected and an overflow to a macro cell(101) is performed. When the number of overflow calls in call communication in the micro cell(102) is C0 or the total number of calls in communication is 'c', an overflow call request by a high speed mobile terminal in the micro cell(102) is rejected and the corresponding call is cut off. When the total number of calls in call communication in the micro cell(102) is 'c', a take-back call request by the low speed mobile terminal in the micro cell(102) is rejected. When the total number of calls in call communication in the micro cell(102) is 'c', a handoff call request by the low speed mobile terminal in the micro cell(102) is rejected and an overflow to the macro cell(101) is performed.
Abstract:
본발명은중계코디네이터에의한저전력센서통신서비스를위한무선자원할당제어방법으로, 가변크기의경쟁구간오프셋(CAP offset), 비경쟁구간오프셋(CFP offset) 및 PAN 코디네이터와하위계층디바이스의데이터중계를위한릴레이구간(relay period : RP)을포함하는프레임을구성하는단계와, 상기프레임구성정보를포함하는비콘프레임을생성하여하위계층디바이스들에전송하는단계와, 비경쟁구간(CFP)을통해하위계층디바이스들로부터수신한데이터를릴레이구간(RP)를통해 PAN 코디네이터에전송하거나, PAN 코디네이터로부터릴레이구간(RP)를통해수신한데이터를비경쟁구간(CFP)을통해하위노드들에전송하는단계를포함한다.
Abstract:
철도 무선 센서 네트워크에서 데이터 고속 전송을 위한 전용채널 설정 및 운용 방법을 제공한다. 철도 무선 센서 네트워크 시스템은 철도차량에 구비되어 상기 철도차량의 동작 상태를 실시간으로 측정하는 복수개의 센서, 각 센서와의 전용채널을 통해 상기 측정된 동작 상태에 대한 정보를 수신하는 복수개의 라우터 및 상기 라우터 간의 전용채널을 통해 상기 동작 상태에 대한 정보를 수신하고 상기 수신한 동작 상태에 대한 정보를 주기적으로 철도차량 관제 센터로 전송하는 게이트웨이를 포함할 수 있다.