Abstract:
A terminal changes a cell to a target base station corresponding to a target cell at an optimal time required for handover by comparing the signal strengths of a serving base foundation and peripheral cells according to a cell change command of the serving base station without immediately changing the cell in a network environment in which a small cell and a macrocell exist together. [Reference numerals] (1) Terminal; (2) Serving base station; (3) Target base station; (S120) HO decision; (S140) Cell change acceptance determination; (S170) Cell change report; (S180) Disconnect to an old cell and connect to a new cell; (S190) Synchronization; (S200) UL resource allocation and timing control
Abstract:
PURPOSE: A handover method at a wireless optical communication system and a mobile station thereof are provided to prevent the generation of the communication disconnection due to the handover, even when the mobile station is mounted on a moving body such as a train. CONSTITUTION: A first optical mobile station (OMS) (11-1) transmits and receives an optical signal with an optical base station (OBS). A second OMS (11-2) is transmits and receives the optical signal with the OBS. The second OMS communicates with the first OMS according to the internal interface. When the first OMS receives a handover command while communicating with the first OBS, the second OMS receives a beacon optical signal from the second OBS. The second OMS transmits and receives the data with the second OBS by forming a communication link with the second OBS. [Reference numerals] (10) Mobile station; (12) Router; (40) Backbone network; (50) User terminal
Abstract:
멀티미디어 방송/멀티캐스트 서비스 시스템의 데이터 송신 방법이 개시된다. 본 데이터 송신 방법은, 복수의 서브프레임들로 구성된 멀티미디어 데이터를 복수의 스케줄링 구간으로 스케줄링 처리하고 스케줄링 정보를 생성한 후, 스케줄링 정보를 미리 단말로 전송함으로써, 제1 스케줄링 구간에 대응하는 복수의 서브프레임들이 스케줄링 정보에 기초하여 단말에서 선택적으로 수신될 수 있도록 한다. 따라서, 단말은 필요한 서브프레임을 선택적으로 수신할 수 있게 되어 데이터 수신에 따른 전력 소모를 감소시킬 수 있게 된다. 스케줄링, 스케줄링 구간, 서브프레임, 무선 자원 할당
Abstract:
본 발명은 이동통신 시스템에 관한 것으로, 보다 상세하게는 이동통신 시스템의 기지국에서 무선자원 할당을 위한 스케줄링(Scheduling) 방법에 관한 것으로, 상기 방법은 사용자 단말을 타겟으로 하는 패킷을 전송받아 사용자별 전송대기 큐에 저장하는 단계와; 사용자별 전송대기 큐의 패킷 유입량에 의한 패킷누적량과 채널영향에 의한 사용자별 평균 전송률을 산출하여 이를 무선자원 할당을 위한 우선순위함수식에 반영하여 얻어진 값들에 기초하여 무선자원 할당하는 단계;를 포함함을 특징으로 한다. 이로써 본 발명은 무선 채널 상황 뿐만 아니라 각 사용자별 단위시간당 패킷 유입량을 고려하여 이에 비례하게 무선 자원 할당함으로써, 높은 시스템 전송률과 사용자의 트래픽에 대한 비례 공평성(Proportional Fairness)을 함게 제공할 수 있다. 무선자원, 할당, 패킷 유입량.
Abstract:
PURPOSE: A start time point randomizing method of a subject terminal operation is provided to randomize operation time of a subject terminal. CONSTITUTION: A terminal(210) standby for standby time of an interval which is shorter than the operation time interval from a starting point of an operation time interval(250). The terminal determines a network device(220) is connected to the terminal(260). The terminal is connected to the network device according to the determination(261). The terminal transmits data to an application server(230) via the network device(270,271).
Abstract:
PURPOSE: A method for operating a base station with low-level power is provided to improve the interference with a neighbor cell by switching a usage power operating mode to a DRX(Discontinuous Reception) mode when traffic does not happen. CONSTITUTION: At an active mode, the state information on the traffic level served by a base station is reported to a device which manages the power management of the base station(506). According to a mode conversion command of the device which gets the report of the state information, the active mode is switched into an inactive mode(508). The traffic level indicates the number of call attempts per unit time.
Abstract:
PURPOSE: An inter-cell interference control method about a mobile terminal locating in border area of cell and an inter-cell interference control device installed in the border area of the cell are provided to simply control the inter-cell interference without using complex algorithm by being installed in the border area of cell. CONSTITUTION: A frequency receiving unit(110) receives the use frequency from the base station belonging to the cell. A scheduling unit(120) schedules mobile terminals locating in the border area of the cell in which the scheduling unit belongs to the natural disposition and controls the inter-cell interference. An information transmitting unit(130) transmits the sync information, the system information, and a reference signal. A frequency change unit(140) notifies the change of frequency to the mobile terminals locating in the border area of cell according to the use frequency change request from the base station of cell to which the frequency change unit belongs.
Abstract:
PURPOSE: A scheduling method for offering a proportional fairness toward the traffic of a user for a mobile communications system is provided to implement high system transmission rate by allocating wireless resources. CONSTITUTION: A transmission standby queue(101) receives a packet for a UEs(User Equipments). The latency queue temporarily stores the received packets according to each user. A packet scheduler(100) receives wireless CQI(Channel Quality Information) which is necessary for the radio resource assignment from user terminals. The packet scheduler receives the packet inflow information per the unit time from the latency queue. The packet scheduler assigns radio resources to user terminals.