Abstract: The present invention relates to a scheduling apparatus and a method thereof in an HPi system. A scheduling algorithm is applied appropriate to a characteristic of each multimedia service (e.g., real-time service, non real-time service, best-effort service, etc.) and a transmission order of the IP packets transmitted from a network is determined such that a transmit wait queue is generated. Radio resource allocation is performed in accordance with the order of the data items queued in the transmit wait queue, the size of transmittable data is determined such that a PDU is generated. In addition, frame data formed of bursts of PDUs is generated and transmitted to a physical layer. Therefore, a scheduling algorithm can be applied appropriate to characteristics of each multimedia service. In addition, packet scheduling is performed in two steps in order to schedule traffic corresponding to radio frames such that packets can be efficiently processed.

Abstract: Disclosed is an apparatus for generating a ranging pseudo noise (PN) code used in a base station of a portable internet system of an orthogonal frequency division multiplexing access scheme, wherein a ranging pseudo noise mask value is generated using a cell ID number, and then the generated ranging pseudo noise mask value is stored in a memory. A final ranging PN code is generated using the stored ranging PN mask value and a status of a pseudo random binary sequence for generating a ranging PN code. With such a structure, the maximal 256-numbered ranging PN code values can be obtained simultaneously with each 144 bit-length.

Abstract: The advantage of the present invention is to provide a sleep mode driving method for reducing power consumption of a portable terminal in a portable Internet system, and to provide the method for the portable terminal to shift into a sleep mode or an awake mode without loss of transmitting and receiving traffic. The portable terminal transmits a sleep mode request message SLP-REQ to the base station, and receives a sleep mode response message SLP-RSP from the base station, so that it can shift to the sleep mode. The portable terminal receives a traffic indication message TRF-IND from the base station during the sleep mode, and shifts to the awake mode. The portable terminal transmits a wake up information message WKUP-INF informing of a normal operation state, and receives downlink traffic from the base station.

Abstract: A receiving apparatus of a mobile terminal receiving a signal in a synchronous OFDM system under a multi-cell environment, including a demodulation start controller performing frame synchronization and cell search using a received signal and outputting information on a demodulation start point and a to-be-demodulated neighbor cell; a FFT unit converting a time-domain signal into a frequency-domain signal; a scramble code generator generating scramble codes for the to-be-demodulated neighbor cell from the demodulation start controller and the current cell; a correlator multiplying a signal from the FFT unit and scramble codes from the scramble code generator and outputting correlation signals; demodulators provided corresponding to a current cell and a maximum number of neighbor cells to be demodulated, and demodulating the correlation signals; and a decoder decoding signals from the demodulators and restoring original information transmitted from the corresponding cell.

Abstract: Disclosed herein is a method of reselling content in a used content server connected to a Digital Right Management (DRM) server for managing authentication information of the content of at least one computing device. The method includes the steps of receiving information of requesting the resale of the content from a first computing device; examining the authentication information of the content requested for the resale through the DRM server; registering the content for sale if the authentication information of the content is valid; receiving purchase request information of the registered content from a second computing device; requesting alteration of the authentication information of the content from the DRM server; receiving a response signal for the alteration of the authentication information of the content; and reselling the content to the second computing device.

Abstract: Disclosed is a ranging system and method in an OFDMA system. The ranging system includes complex exponential twiddle storage units for respectively storing complex exponential twiddle factors corresponding to a timing error, complex multipliers for respectively complex-multiplying the complex exponential twiddle factors by received uplink ranging data, code correlators for respectively correlating the outputs of the complex multipliers and ranging codes, and threshold comparators for respectively comparing the outputs of the code correlators with a threshold.

Abstract: The present invention relates generally to a method and apparatus for providing a virtual mobile phone number, and, more particularly, to a method and apparatus for requesting routing information, such as an actual phone number from a home location register storing the actual phone number corresponding to a virtual phone number transmitted from an originating terminal and transmitting a short message, a long message or a multimedia message to a terminating terminal corresponding to the actual phone number.

Abstract: Disclosed are a certification mobile terminal, and an electronic transaction system and method using the same. A certificate is downloaded to a mobile terminal from a certification authority. In a wired electronic transaction, a user's transaction history is provided to the mobile terminal from a service providing server or a user's transaction terminal, and the mobile terminal digitally signs the transaction history by using a stored digital certificate and provides the digitally signed transaction history to the service providing server or the transaction terminal so that the service providing server may finally receive the digitally signed transaction history. The service providing server settles the transaction with the user according to the digitally signed transaction history, and provides a service to the user. Also, in the offline transactions, the certificate stored in the mobile terminal is provided to a system to thereby execute stable transactions based on the certificate.

Abstract: A receiver is protected by reducing a transmit leakage signal leaked when a transmit signal is radiated through the antenna by using three circulators (transmitter, antenna, and receiver). The transmitter and antenna circulators output the transmit leakage signal to be reduced to less than the transmit signal through a first leakage path. The transmitter and receiver circulators output the transmit leakage signal through a third leakage path and reduce the signal. The transmit leakage signals received through the first and third leakage paths are canceled, and that received through a second leakage path is output to a receiver. The transmit leakage signal has a 40 dB signal reduction compared to the transmit signal, and is transmitted to the receiver.

Abstract: The present invention relates to a method for automatic gain control (AGC) before an initial synchronization of a mobile station modem in OFDM system, and an apparatus thereof The AGC apparatus includes: an initial synchronization inspector that verifies whether an initial synchronization for an input block sample (k) signal has been performed; a frame divider that divides a frame into predetermined intervals B(k) for the input block sample(k) signal in the case that the initial synchronization has not been performed; a reference value inspector that compares a difference value Pref?Pcalc, between a predetermined reference value Pref and sample data average energy Pcalc, with a predetermined value; a count controller that increases or decreases the count when the difference value Pref?Pcalc compared by the reference value inspector is greater or less than the predetermined value; a count inspector that inspects whether the count is greater or less than 0 when the input block sample (k) reaches a maximum value

Abstract: Disclosed are a method for constructing a frame preamble in an OFDM wireless communication system, and a method for acquiring frame synchronization and searching cells using the preamble. The preamble is arranged at the beginning of a frame and constructed of a pattern repeated an integer number of times, and a CP. The pattern has a length shorter than a single OFDM symbol interval. The length of the repetitive pattern is not limited to an integer number of times a single OFDM symbol interval. Frame synchronization can be acquired by observing cross-correlation of a received signal and reference patterns and detecting the moment when the absolute value of the cross-correlation exceeds a predetermined threshold. Otherwise, frame synchronization can be acquired by observing auto-correlation of the received signal using repeated patterns included in the received signal and detecting the moment when the absolute value of the auto-correlation becomes the maximum value.

Abstract: Disclosed is a device (200) and a method for measuring a receive sensitivity of a communication system having a transmit and receive path and a receive-only path, like a base station (100) employing space diversity by means of one transmit and receive antenna (111) and an additional receive antenna (121). A terminal (220) is connected to the transmit and receive path and to the receive-only path by means of a first (112) and a second coupler (122) and a first (213a) and a second transmitter (215a) whereby the input signals are combined by a combiner (211) to a single signal fed to the terminal (220).

Abstract: The present invention relates to a dualduplexer having a matrix structure and a fabrication method thereof. The dualduplexer includes a dualduplexing block which uses the transmitting input unit, the receiving input unit, the transmitting output unit and the receiving output unit in common, wherein the transmitting input unit, the receiving input unit, the transmitting output unit and the receiving output unit are connected in the form of a matrix; a low noise amplifying block for performing low noise amplification on a signal outputted from an input port of the dualduplexing block; and a high power amplifying block for performing high power amplification on the signal outputted from the low noise amplifying block and transmitting the amplified signal to the dualduplexing block.

Abstract: Disclosed is an apparatus and method for measuring output power of a pilot channel transmitted from a CDMA (code division multiple access) base station. The method for measuring transmission output power of the base station in a forward link from the CDMA base station to at least one mobile station, includes receiving output power of the base station, measuring the total output power outputted from the base station by means of an output power level measurement unit and at the same time dividing and measuring the output power of the base station in the same time zone according to each code by means of a code domain analyzer, evaluating a proportion which the pilot channel accounts for with respect to all code domains, and evaluating only output power of the pilot channel by multiplying the proportion of the pilot channel by the total output power of the base station.

Abstract: The present invention relates to a method and system for receiving data by using the SMS and the wireless Internet. The method comprises the steps of receiving a short message from said service provider, wherein the short message comprises at least a service identifier and site information, determining whether or not there is an application protocol in the site information and executing an IP channel connecting program in correspondence with the application protocol, when the application protocol is in the site information, wherein the data receiving system receives data in correspondence with the application protocol from the service provider by executing the IP channel connecting program.

Abstract: Disclosed is a CDMA terminal for providing a CDMA service to a global system for mobile communications (GSM) service subscriber in a CDMA service area which comprises: a subscriber identity module (SIM) cardholder for installing or uninstalling a SIM card of a GSM service subscriber, wherein when a SIM card of the GSM service subscriber is installed in the SIM cardholder in the CDMA service area, specific data are transmitted using a CDMA message in the case of authenticating the GSM service subscriber using information on the GSM service subscriber stored in the SIM card, and when the authentication of the GSM service subscriber is normally completed, the CDMA terminal is used for the GSM service subscriber as a roaming service terminal in the CDMA service area. According to the present invention, the GSM service subscriber can use his SIM card and number in the CDMA service area.

Abstract: A method and device for providing a mobile subscriber with access to non-subscriber mobile services via the use of a virtual mobile phone number is disclosed. In one embodiment, the method comprises i) receiving a mobile service request from a user terminal, ii) determining whether or not the user is a home subscriber, iii) requesting that a virtual mobile phone number be provided if the user is a non-subscriber, iv) receiving the virtual mobile phone number from the user terminal, v) providing a corresponding mobile service if the received virtual phone number is verified, and vi) charging for use of the mobile service based on the virtual mobile phone number.

Abstract: Disclosed is an electronic gift certificate circulating method for a gift certificate service system including a gift certificate database and a gift certificate service server to manage sales of the electronic gift certificates according to requests by a communication terminal through wired and wireless networks, comprising: receiving a user's purchase request from the communication terminal; checking a settlement state of the electronic gift certificate bought by the user; settling the electronic gift certificate bought by the user, and issuing the bought electronic gift certificate to the user, when the user requests settlement; storing the issued gift certificate information in the gift certificate database; and notifying the user of the gift certificate purchase particulars in a

Abstract: The present invention relates to repeater supervision system and method for managing and operating remote repeater by supervising and analyzing the quality of wireless and the quality of telephone call on repeater to enlarge a service area. The repeater supervision system comprises a repeater supervision apparatus for collecting electronic waves generated from the repeater, analyzing the collected electronic waves using a program designated beforehand and transmitting the analyzed results, a SMS center for receiving the analyzed results from repeater supervision apparatus and transmitting the analyzed results, a repeater management apparatus for receiving the analyzed results from the SMS center and managing the repeater, a storage for storing the analyzed results by the repeater management apparatus.

Abstract: There is provided a method of supporting small group multicast in mobile IP in which an implicit multicast packet received by a home agent is shifted to an explicit multicast packet including the IP address of a mobile node registered as a multicast receiving party to be transmitted to a care-of address, explicit multicast routing is performed based on the current care-of address of the mobile node described in the explicit multicast packet in case where the home agent receives this explicit multicast packet, and the mobile node uses the IP address of the home agent as the originating party's address when it sends the explicit multicast packet via a multicast router of a visited network.