Abstract:
본 발명은 IP 기반의 패킷 무선 접속망에서의 고속 핸드오프 장치 및 방법에 관한 것이다. 본 발명은, 단말과 무선링크로 연결되어 무선 통신을 수행하는 제 1 무선 접속점과, 단말의 이동으로 인하여, 단말로부터의 핸드오프 요구에 따라 단말이 제 1 무선 접속점과의 무선 링크를 연결한 상태에서, 단말과의 새로운 무선링크를 연결하여 무선 통신을 수행하는 제 2 무선 접속점, 그리고, 단말의 핸드오프 동작시 상기 제 1 무선 접속점 및 제 2 무선 접속점과의 이중 유선 링크를 연결하여 핸드오프 중에 단말로 전송되는 IP 패킷을 상기 제 1 무선 접속점 및 제 2 무선 접속점으로 동시에 전송하는 핸드오프 제어기를 포함하는 무선 패킷 접속망에서 단말과, 핸드오프 제어기에 핸드오프 수행 중에 이중링크를 통해 송수신되는 IP 패킷을 분배 및 선택하는 기능을 추가로 구성하여 핸드오프 동작 중에 지연을 없애고, 패킷 분실의 위험이 적은 고속 핸 드오프가 가능하도록 한다.
Abstract:
본 발명은 차세대 이동통신망에서의 패킷 복구 시스템 및 그 방법에 관한 것이다. 차세대 이동통신망에서의 패킷 복구 시스템 및 그 방법시스템은, 핸드오버 시 홈 셀에서 목적 셀로 패킷들을 백업하여, 목적 셀은 패킷의 헤더 정보를 이용하여 패킷 버퍼에 패킷들을 저장한 후 홈 셀로부터 긍정응답(ACK) 메시지가 백업되면, 백업된 ACK 메시지의 호 ID와 패킷 번호를 이용해 패킷 버퍼에서 동일한 패킷 번호를 갖는 패킷을 찾아 삭제하고, 핸드오버 종료 후 패킷 버퍼에 남아있는 패킷들을 이동 단말기로 전송하는 것이다. 이와 같이 하면, 핸드오버 시 홈 셀에 남아 이동 단말기로 전송되지 못하고 폐기되는 패킷을 목적 셀에 복구하여, 핸드오버 종료 후 목적 셀에서 남은 패킷들을 이동 단말기로 전송함으로써 패킷 손실을 방지하여 유선망과 대등한 서비스품질을 보장할 수 있다.
Abstract:
PURPOSE: A channel simulator of a wireless subscriber network system is provided to simultaneously move 4 handover simulators by just turning one of the simulators, or to move two handover simulators in dual mode, and to change an attenuation value by moving only one of the simulators, thereby measuring changes by speed. CONSTITUTION: Duplexers(201,202,203) separate/couple transceiving signals coming from base stations(240,241). Attenuators(230-233) attenuate signals of a terminal(200) or the base stations(240,241) outputted from the duplexers(201,202,203). A separator(220) separates the signals outputted from the terminal(200) according to each base station. A coupler(221) couples the signals transmitted from each base station. Output power of the terminal(200) is attenuated through the attenuators(230,232), and is inputted to the base stations(240,241). Output power of the base stations(240,241) is attenuated through the attenuators(231,233), and is inputted to the terminal(200).
Abstract:
PURPOSE: A method for an adaptive location service in a wireless communication system is provided to movably assign resources by considering resources of a terminal in a network providing the current location tracing service based on the requested QoS and the accuracy. CONSTITUTION: A core network requests a location service to an LSCF(LCS Server Control Function)(301). The LSCF selects the most appropriate location tracing method(303). The LSCF requests information necessary for the selected location tracing method and receives the requested information from an LSOF(LCS System Operation Function)(305-307). The LSCF transmits a measurement control message(311). A mobile station transmits a measurement request message to entities corresponding to support information(313-315). A GPS transmits a GPS(Global Positioning System) measurement response message(317). A PSMF transmits an OTDOA(Observed Time Difference of Arrival) measurement request message to an RRC(Radio Resources Control)(319). The LSCF receives th result of the measurement request through a measurement report message from the corresponding entity(320). If an RTT(Round Trip Time) is needed, the LSCF requests RTT information to the PSMF(321). An NBAP(Node-B Application Part) transmits an OTDOA and cell ID measurement request message to the PSMF(323). The PSMF transmits an OTDOA and cell ID measurement response message to the PSMF(325). The PSMF transmits RTT information through a dedicated measurement report to the LSCF(327). The RRC transmits an LCS(Location Service) calculation request message to the LSCF(329). The LSCF transmits a calculation message to a PCF(Position Calculation Function)(331). The PCF transmits the calculated measurement information to the LSCF through a location estimation message(333-337).
Abstract:
PURPOSE: A method for an adaptive location service in a wireless communication system is provided to movably assign resources by considering resources of a terminal in a network providing the current location tracing service based on the requested QoS and the accuracy. CONSTITUTION: A core network requests a location service to an LSCF(LCS Server Control Function)(301). The LSCF selects the most appropriate location tracing method(303). The LSCF requests information necessary for the selected location tracing method and receives the requested information from an LSOF(LCS System Operation Function)(305-307). The LSCF transmits a measurement control message(311). A mobile station transmits a measurement request message to entities corresponding to support information(313-315). A GPS transmits a GPS(Global Positioning System) measurement response message(317). A PSMF transmits an OTDOA(Observed Time Difference of Arrival) measurement request message to an RRC(Radio Resources Control)(319). The LSCF receives th result of the measurement request through a measurement report message from the corresponding entity(320). If an RTT(Round Trip Time) is needed, the LSCF requests RTT information to the PSMF(321). An NBAP(Node-B Application Part) transmits an OTDOA and cell ID measurement request message to the PSMF(323). The PSMF transmits an OTDOA and cell ID measurement response message to the PSMF(325). The PSMF transmits RTT information through a dedicated measurement report to the LSCF(327). The RRC transmits an LCS(Location Service) calculation request message to the LSCF(329). The LSCF transmits a calculation message to a PCF(Position Calculation Function)(331). The PCF transmits the calculated measurement information to the LSCF through a location estimation message(333-337).
Abstract:
PURPOSE: A method for controlling physical channel setup using a synchronization message in an asynchronous mobile communication system is provided to start to change a channel after obtaining modem shape setup confirmation information from a synchronization message by adding the synchronization message, thereby stably changing the channel. CONSTITUTION: An RNC(110) transmits an RRC(RL(Radio Link) Reconfiguration Commit) connection setup message(221) to a UE modem(210), and transmits a wireless link setup request message(225) to an RTS modem(220). During downlink, the RTS modem(220) transmits a DPCCH(Dedicated Physical Control Channel)(223) to the UE modem(210) being in active state. A DPCH setup confirmation message(222) is transmitted to a UE(L2/L3)(200). During uplink, the RTS modem(220) transmits a synchronization indication message(229) to an RNC-L2(230). The RNC-L2(230) transmits a wireless link setup request indication message(231) to an RNC-L3(240). The UE(L2/L3)(200) confirms whether a DPCH setup confirmation message(227) and an RRC connection setup complete request message(233) are normally received, and transmits an RRC connection setup complete message.
Abstract:
PURPOSE: An overload control method for a cell broadcast service in a mobile communication system is provided to effectively control an overload during a cell broadcast service by controlling a radio resource and a broadcast period. CONSTITUTION: A BMC(Broadcast and Multicast Control) layer of a control station recognizes overload occurrence possibility(40) due to shortage of a radio resource, it requests the additional allocation of a radio resource from an RRC(Radio Resource Control) layer(41). If the RRC layer authenticates allocation of an additional radio resource, it allocates an additional radio resource for a cell broadcast service(42). If the control station receives a new broadcast from a cell broadcast center(45), it checks an overload state flag. If the overload state is 'true', the control station controls the overload by increasing a broadcast period by messages according to priority on the basis of a broadcast term, a broadcast period and the size of a broadcast message on the air by stages(47). If a broadcast for a specific broadcast message is completed in an overload state(48), the control station checks the overload state flag. If the overload state is 'true'(49), the control station restores to the original state by decreasing the broadcast period according to the priority on the basis of the broadcast term, the broadcast period and the size of the broadcast message on the air by stages(50). When the broadcast period for every broadcast message on the air is restored(51), the overload state flag is set to 'false' to transit to an overload release state(52), and the cell broadcast center is informed the release of the overload state(53).
Abstract:
1. 청구 범위에 기재된 발명이 속한 기술분야 본 발명은 이동통신시스템에서 매체 액세스 제어 프레임 구조를 이용한 제어 평면 정보 송수신 방법에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은, 아웃-오브-밴드 신호 전달 방식으로 인한 무선 자원의 낭비를 방지하기 위하여 기지국이 이동국에 할당한 제어 채널을 이용하여 해당 이동국의 사용자 데이터를 전송할 수 있도록 하는 이동통신시스템에서 매체 액세스 제어(MAC : Medium Access Control) 프레임 구조를 이용한 제어 평면 정보 송수신 방법을 제공하고자 함. 3. 발명의 해결방법의 요지 본 발명은, 이동통신시스템에 적용되는 매체 액세스 제어(MAC : Medium Access Control) 프레임 구조를 이용한 제어 평면 정보 송수신 방법에 있어서, 사용자 평면 및 제어 평면으로부터 정보를 수신하여 프레임을 구성하고, 상기 정보를 분석하여 상응하는 정보에 의해 결정되는 평면이 지시하는 프레임을 송신하기 위한 제 1 단계; 및 제어 채널상으로 정보를 수신하여 프레임을 분석하고, 상기 프레임에 상응하는 평면의 계층으로 정보를 전송하기 위한 제 2 단계를 포함함. 4. 발명의 중요한 용도 본 발명은 이동통신시스템 등에 이용됨.
Abstract:
PURPOSE: A method for allocating an initial power value of a packet access channel is provided to decide an initial power level used in a random access process of a wireless subscriber network system, so as to minimize an interference to a user performing a call, and to speedily perform a packet service. CONSTITUTION: A packet access channel decides whether present used traffic channels exist, to decide an initial power level for a packet random access process. If so, the packet access channel decides a power level applied to the presently-used traffic channels as the initial power level of the packet random access process. If the presently-used traffic channels do not exist, the packet access channel receives traffic channels and sets up temporary traffic channels(400c,500a), then decides a power level applied to the temporary traffic channels(400c,500a) as the initial power level of the packet random access process. The packet access channel generates a power control command for deciding an initial power level of a next access channel, by using a result received by applying a different processing gain relating to data transmitted to a base station(500). The packet access channel transmits the power control command to a terminal station(400) as signal channels(400b,500b) for broadcasting.