Abstract: The method for controlling a use amount of a radio channel for transmitting a packet from a node in a wireless Ad Hoc network that employs a contention-based protocol includes (a) estimating a total amount of data transmitted through packet transmission from the node; (b) controlling a backoff time that determines the use amount of the radio channel based on the estimated amount of transmitted data; and (c) participating in contention for gaining access for the next packet transmission by using the backoff time. A contention window value for setting the bounds of backoff time can be set by calculating a total amount of data transmitted through a transmit node, and thus channel distribution can be controlled such that a plurality of transmit nodes can fairly transmit data through the channel, thereby enhancing quality of packet data service.

Abstract: The present invention relates to an uplink framing method and apparatus in a mobile communication system. After a mobile terminal and a base station are connected to each other in a wireless manner, the base station allocates an uplink radio resource to a medium access control (MAC) layer of the mobile terminal, and then scheduling is performed for each connection in a buffer. Next, a packet data unit (PDU) is generated to satisfy the uplink time constraint and then transmitted to the base station. Therefore, hardware implementation complexity can be minimized in a mobile communication system that should support fast data transmission, and at the same time, a required uplink framing time can be minimized in a system that supports a short frame period.

Abstract: Provided are an electronic surveillance system and a method thereof. In the electronic surveillance system that performs electronic surveillance on a subscriber in a communication network, the electronic surveillance system includes: one or more communication service providers that provide retained data, which is information generated while the subscriber uses a communication service; a dedicated storage that stores and manages the retained data provided by the communication service providers; and a law enforcement agency that requests the dedicated storage to send electronic surveillance information on a specific subscriber so as to be provided with the surveillance information when the electronic surveillance information on the specific subscriber is required. Accordingly, retained data, which is subscriber electronic surveillance information is integrally managed and stored in a dedicated storage.

Abstract: The present invention relates to a method of detecting a space-time code in a mobile communication system. When detecting a space-time code B for a plurality of transmitting antennas, an ML (maximum likelihood) metric, which is generally calculated by using a specific structure of a matrix B, is defined as a new ML metric by reducing a variable of the ML metric. Two dependent sphere decoding processes are performed and an intersection of the decoding results is calculated, and a signal is detected from the ML metric. Therefore, since detection of the space-time code B for the plurality of transmitting antennas is performed by using the newly defined ML metric, an amount of matrix calculated can be reduced, and a calculation amount can be reduced by performing the two dependent sphere decoding processes. Further, since a detection order of symbols is changed according to a channel situation, it is possible to improve the performance of the system.

Abstract: The present invention relates to an interworking device for interworking with a first network and exchanging data between a second network and a terminal device. The interworking device establishes a first wireless data path with the first network, and receives a first network address from an address allocation server of the first network through the first wireless data path. In addition, the interworking device establishes a second wireless data path with the terminal device, receives a second network address from an address allocation server of the second network through the second wireless data path, and transmits the second network address to the terminal device. Subsequently, the interworking device establishes a tunnel that passes through the first network and is accessed to the second network, and exchanges data with the second network.

Abstract: Disclosed is an interworking device for interworking with the first network and supporting signaling for a terminal of a second network. The interworking device sets a first wireless data path with the first network. The interworking device sets a first radio link with the terminal, receives an authentication message through a first radio link, and transmits the authentication message to an authentication server of the second network through the first wireless data path. When the authentication server finishes authentication, the interworking device sets a second wireless data path with the terminal. Accordingly, the interworking device provides an Internet service to the terminal during movement.

Abstract: The present invention relates to a device for interworking a wireless local area network (WLAN) and a portable Internet. The device establishes a first wireless data path following a first wireless communication protocol with a first network, and establishes a plurality of the second wireless data paths through the first wireless data paths. Here, the plurality of the second wireless data paths follow a second wireless communication protocol and respectively correspond to a plurality of terminal devices. Subsequently, the device establishes a plurality of first network links respectively corresponding to the plurality of terminal devices with the first network, and stores mapping information for the first network link corresponding to a relationship between the plurality of terminal devices and the plurality of first network links.

Abstract: In the method for dynamic IP allocation using a mobile IP in a wireless portable Internet system, a MAC message used to register a mobile subscriber station contains a flag including a mobile IP version parameter. Upon checking the mobile IP version, the mobile subscriber terminal transmits a mobile IP registration request message to a base station during MAC connection establishment. The base station transmits a mobile IP registration reply message to the mobile subscriber in response to the received mobile IP registration request message to allocate a dynamic IP address to the mobile subscriber station. The dynamic IP allocation process is performed through a secondary management connection to achieve a rapid handoff without using a connection identifier. In addition, the present invention supports a seamless service and the use of the mobile IP in the IEEE 802.

Abstract: Disclosed are a method for requesting, generating and distributing a service-specific traffic encryption key in a wireless portable Internet system, an apparatus for the same, and a protocol configuration method for the same. In the present invention, a subscriber station sends a Key Request message for requesting a service-specific traffic encryption key to the base station using a PKM-REQ MAC message, and a base station analyzes the Key Request message to generate the requested service-specific traffic encryption key. Subsequently, the base station sends a Key Reply message, including the generated service-specific traffic encryption key, to the subscriber station using a PKM-RSP MAC message. If the base station fails to generate the key, the base station sends a Key Reject message, including a reason for the failure, to the subscriber station.

Abstract: Disclosed is a method for constituting a layered cell, which is for constituting a cell in an OFDMA (Orthogonal Frequency Division Multiple Access) mobile communication system. The method includes: (a) dividing L carriers having orthogonality into M sub-channels; (b) dividing the carriers into N groups each having the M sub-channels; (c) grouping the N groups by an arbitrary integer into K classes; and (d) constituting a plurality of layered cells corresponding to the K classes. According to the present invention, the conception of the independent classes is introduced for a plurality of carriers to facilitate the use of the carriers to a system requiring an independent wireless area, allowing design of sectors and cells at a single frequency.

Abstract: Disclosed are a subscriber station authentication method, a protocol configuration method, and a device thereof in a wireless portable Internet system. In the subscriber station authentication method, an authentication mode between a subscriber station (10) and a base station (20) is negotiated, and the authentication mode is negotiated by the base station (20) according to the authentication mode negotiation. The authentication modes include an authentication mode based on the IEEE 802.16 privacy standard protocol and an authentication mode based on the standardized authentication protocol of the upper layer. Authentication is performed by the base station (10) in the case of the authentication mode based on the IEEE 802.16 privacy standard protocol, and the authentication is performed through message transmission using a diameter protocol between a base station (10) and an authentication server (40) in the case of the authentication mode based on the standardized authentication protocol of the upper layer.

Abstract: Disclosed is a call admission controlling device and method for providing QoS (quality of service) in the portable Internet. When a mobile terminal requests a guarantee of the corresponding QoS and a call admission, a packet access router calculates a bandwidth available for resource reservation according to mobility characteristics of a cell to which the mobile terminal belongs, and determines resource reserved states according to the mobility characteristics with adjacent cells based on the calculated bandwidth to thus control call admission in order to satisfy a handoff dropping probability of the corresponding cell and prevent disconnected calls when a handoff toward the adjacent cells occurs. As a result, the handoff dropping probability of cells is guaranteed, and the resources are utilized effectively.

Abstract: The present invention discloses a system for providing a call service for a mobile terminal to an application server. The system includes a location server that manages a location of the mobile terminal in an idle state by a paging group identifier. A paging controller detects a state and a location of the mobile terminal from the location server. When the mobile terminal is in the idle state, the paging controller requests a paging operation from at least one paging controller corresponding to the paging group having the mobile terminal so that the mobile terminal receives a network address when in the idle state, and provides the network address to the application server.

Abstract: A radio network controller of an IMT-2000 asynchronous system that includes a Node-B matching radio access system for accessing to a Node-B; a traffic processing radio access system for performing a soft handover of radio traffic channels of the base transceiver stations; and an ATM switch accessible to the traffic processing radio access system, for providing a path for communicating traffic and control data in the radio network controller, switching ATM cells, providing a path for transmitting various traffic between radio network controllers and soft handover between the radio network controllers.

Abstract: A radio network controller of an IMT-2000 asynchronous system is disclosed.

Abstract: A cellular capacity in a multimedia DS-CDMA system may be maximized by controlling a transmission rate of data calls. In a method for maximizing the cellular capacity, the total interference quantity is controlled by restraining the transmission rates of the respective data calls according to diminution factors of a linear, a parabola and a hyperbola; the transmission rate of the data call is increased in case a traffic load is small; and the transmission rate of the data call is decreased in case the traffic is overloaded, thereby more calls can be received and the number of subscribers having a service of voice and data calls in the CDMA circumstances may be allowed most suitably. In case a call of higher priority is newly received under a state that the data call of a high speed occupies a resource of a system for a long time, the transmission rate of the currently progressing data is controlled to receive the new call.

Abstract: The call attempts are controlled under the traffic overload of CDMA environment provide a method in which when the message transmitted for a new call attempt is failed in the state of traffic overload, the speech quality and the number of mobile station which are on the line are maintained to the desired level by controlling the retransmitting of the message to the proper level.

Abstract: The method for controlling an overload cell in a CDMA Mobile System comprises the steps of: a first step of receiving information on the overload cell from an overload detection module within a base station controller to retrieve the information on the load of neighboring cells and calculating the information on the total overload of neighboring cells; a second step of determining whether or not the total overload of the neighboring cell in a second hierarchy is greater than the maximum value of the neighboring cells; a third step of informing the overload detection module of the impossibility of control and terminating the procedure when it is determined that the total overload of the neighboring cell in the second hierarchy is not greater than the maximum value of the neighboring cells; a fourth step of retrieving a cell group as a third hierarchy with minimum load when at the second step it is determined that the total overload of the neighboring cell in the second hierarchy is greater than the maximum val

Abstract: This invention is directed to a method for allocating a call in a CDMA base station. Whenever the base station receives a report of the change in the transmission power from channel processors, the level of interference affecting neighboring cells by a cell of its own is measured. In addition, when a new call is attempted, upon comparing the measured level of interference with a predetermined reference level (a threshold value) of interference, it is determined whether a call is allowed (i.e, allocated) or not dependent on a distance between the mobile station and the base station.

Abstract: An improved overload control method using a call control process load ratio of a CDMA mobile system which is capable of which is capable of controlling a paging, a signal transmission, and an overload by a signal transmission and receiving by their threshold values by computing an average load ratio of a process and a variable permission ratio at the time of overload using the current CPU occupying ratio and a load ratio of a call control process, which includes the steps of a first step for judging as to whether an overload is loaded by calling an overload judgement procedure when a timer of an overload control process is driven in accordance with a generation of a periodical process of an operating system; a second step for controlling an overload by calling the overload control procedure when it is judged as an overload as a result of the first step; and a third step for releasing the overload state by calling an overload release procedure when the previous state is an overload state by checking the previo