Abstract: A Radio Network Controller (RNC) in a high speed wireless communication system includes an apparatus to perform method for changing a serving cell in the high speed wireless communication system. The RNC receives UpLink (UL) cell change determination information representing UL channel states from a serving Base Station (BS) and a target BS. The UL is received if a UL soft handover of a Mobile Station (MS) is initiated depending on a DownLink (DL) channel quality of the MS. The RNC can determine UL cell change timing of the MS using the UL cell change determination information. Thereafter, the RNC can send an instruction of a UL cell change of the MS to the serving BS and the target BS.

Abstract: An operating method, a base station, and terminal of a cell of a first communication system for a handover between the first communication system and a second communication system are provided.

Abstract: An operating method, a base station, and terminal of a cell of a first communication system for a handover between the first communication system and a second communication system are provided.

Abstract: An operating method, a base station, and terminal of a cell of a first communication system for a handover between the first communication system and a second communication system are provided. The method includes, when a terminal initiates a handover between the first communication system and the second communication system, transmitting, by the base station, a message, requesting to measure a signal level of a downlink, to the terminal, when a signal level measured by the terminal falls below a preset threshold, requesting, by the base station, a handover to the second communication system over a core network, receiving, by the base station, a message, including radio channel parameters the that is required when the terminal accesses to the second communication system, from the second communication system, and forwarding, by the base station, the message, including the radio channel parameters of the second communication system, to the terminal.

Abstract: An operating method, a base station, and terminal of a cell of a first communication system for a handover between the first communication system and a second communication system are provided. The method includes, when a terminal initiates a handover between the first communication system and the second communication system, transmitting, by the base station, a message, requesting to measure a signal level of a downlink, to the terminal, when a signal level measured by the terminal falls below a preset threshold, requesting, by the base station, a handover to the second communication system over a core network, receiving, by the base station, a message, including radio channel parameters the that is required when the terminal accesses to the second communication system, from the second communication system, and forwarding, by the base station, the message, including the radio channel parameters of the second communication system, to the terminal.

Abstract: An apparatus is configured to allocate an IDentification (ID) cell to avoid duplication of a preamble Pseudo Noise (PN) code in a broadband wireless communication system. The apparatus selects one sector inside the system. A temporary ID cell for the selected sector is selected. Whether an ID cell of a sector to which an ID cell has been already allocated inside a minimum unit group for ID cell allocation is the same as the temporary ID cell is determined. Whether PN codes of sectors inside a neighbor list of the selected sector are the same as temporary PN codes determined using the temporary ID cell are determined. When the temporary ID cell is not duplicated and the temporary PN codes are not duplicated, the selected temporary ID cell is allocated as an ID cell of the selected sector.

Abstract: An apparatus and method for determining operation of location update in a broadband wireless communication system are provided. The apparatus includes a receiver, an interpreter, and a determiner. In an idle mode, the receiver receives a paging advertisement message from a Base Station (BS). The interpreter identifies paging group identification information included in the paging advertisement message. The determiner determines one of execution and non-execution of a location update process due to a change of a paging group if the paging group identification information is different from paging group identification information included in a previously received paging advertisement message.

Abstract: An apparatus and a method for handover between a broadband wireless communication system and a heterogeneous communication system are provided. An operating method of a base station for the handover between a broadband wireless communication system and a and a heterogeneous communication system includes when a terminal enters a border cell, sending a message requesting to measure a signal level of a downlink, to the terminal, when a signal level measured by the terminal falls below a preset threshold, requesting a handover, to a corresponding heterogeneous communication system, over a core network, receiving a message, including channel allocation information for the handover, from the corresponding heterogeneous communication system, and forwarding the message, including the channel allocation information, to the terminal. Hence, when the terminal gets out of the service coverage area of the broadband wireless communication system, it can be handed over to the heterogeneous communication system seamlessly.

Abstract: A Radio Network Controller (RNC) in a high speed wireless communication system includes an apparatus to perform method for changing a serving cell in the high speed wireless communication system. The RNC receives UpLink (UL) cell change determination information representing UL channel states from a serving Base Station (BS) and a target BS. The UL is received if a UL soft handover of a Mobile Station (MS) is initiated depending on a DownLink (DL) channel quality of the MS. The RNC can determine UL cell change timing of the MS using the UL cell change determination information. Thereafter, the RNC can send an instruction of a UL cell change of the MS to the serving BS and the target BS.

Abstract: An apparatus is configured to allocate an IDentification (ID) cell to avoid duplication of a preamble Pseudo Noise (PN) code in a broadband wireless communication system. The apparatus selects one sector inside the system. A temporary ID cell for the selected sector is selected. Whether an ID cell of a sector to which an ID cell has been already allocated inside a minimum unit group for ID cell allocation is the same as the temporary ID cell is determined. Whether PN codes of sectors inside a neighbor list of the selected sector are the same as temporary PN codes determined using the temporary ID cell are determined. When the temporary ID cell is not duplicated and the temporary PN codes are not duplicated, the selected temporary ID cell is allocated as an ID cell of the selected sector.

Abstract: An apparatus and method for planning a wireless network is provided. An apparatus for planning a wireless network includes a parameter input unit for receiving parameter information, and outputting the parameter information, a Rise over Thermal (RoT) calculator for calculating an RoT using the parameter information, and outputting the RoT, a first uplink performance prediction index determiner for determining a Modulation and Coding Scheme (MCS) level using the RoT, and outputting determined MCS level information, a maximum achievable Carrier to Interference and Noise Ratio (CINR) calculator for calculating a maximum achievable CINR of the determined MCS level using the determined MCS level information, and outputting a calculated maximum achievable CINR, and a second uplink performance prediction index determiner for determining at least one among a mobile station (MS) transmission power, a data rate, and an uplink CINR using the determined MCS level information.

Abstract: An apparatus and method for determining operation of location update in a broadband wireless communication system are provided. The apparatus includes a receiver, an interpreter, and a determiner. In an idle mode, the receiver receives a paging advertisement message from a Base Station (BS). The interpreter identifies paging group identification information included in the paging advertisement message. The determiner determines one of execution and non-execution of a location update process due to a change of a paging group if the paging group identification information is different from paging group identification information included in a previously received paging advertisement message.

Abstract: An apparatus and a method for handover between a broadband wireless communication system and a heterogeneous communication system are provided. An operating method of a base station for the handover between a broadband wireless communication system and a and a heterogeneous communication system includes when a terminal enters a border cell, sending a message requesting to measure a signal level of a downlink, to the terminal, when a signal level measured by the terminal falls below a preset threshold, requesting a handover, to a corresponding heterogeneous communication system, over a core network, receiving a message, including channel allocation information for the handover, from the corresponding heterogeneous communication system, and forwarding the message, including the channel allocation information, to the terminal. Hence, when the terminal gets out of the service coverage area of the broadband wireless communication system, it can be handed over to the heterogeneous communication system seamlessly.

Abstract: A method for allocating reverse and forward channel power in a W-CDMA WLL system is disclosed.

Abstract: Disclosed is a method for optimizing hard handoffs, e.g., between Mobile Switching Centers in a CDMA network. In the method, preliminary conditions for a hard handoff test are first set up. Idle handoffs are then performed in a hard handoff area, log data for the idle handoffs is analyzed and adjustments to communication equipment are made accordingly. Next, hard handoff tests are conducted in a traffic state in the hard handoff area. Log data of the hard handoff tests are analyzed and further adjustments to communication equipment are made if hard handoff performance during the hard handoff tests is determined to be unsatisfactory. A final hard handoff confirmation test is then performed in the hard handoff area following the latter communication equipment adjustments.

Abstract: A method for adding to a sector list substitute information about a sector excluded from the sector list due to low strength of a corresponding PN signal transmitted from a base station. The coordinates of adjacent bins relative to the location of the mobile user are searched and tabulated, then the sector information of adjacent bins are retrieved and added to the sector list of a mobile station.

Abstract: A method for constructing a zone database for providing home zone services to the subscribers of a mobile communications system, comprises the steps of dividing a service area into a plurality of home service zones; simulating the communication coverage of the base stations for each of the home service zones; detecting the pilot signal strengths of the base stations; and, selecting a given number of the base stations in the order of pilot signal strength as the home zone.

Abstract: A method for controlling forward power utilizing 13K erasure indicator bit in a CDMA system improves the call quality and subscriber capacity by setting a nominal_gain, a maximum traffic channel gain (max_tx_gain), a minimum traffic channel gain (min_tx_gain), and a reduction rate in an optimal combination, wherein the nominal_gain is initial gain of primary traffic channel, the max_tx_gain is maximum gain of traffic channel, the min_tx_gain is minimum gain of traffic channel, and the reduction rate represents a cycle rate to decrease the digital gain by 1 for the received frames. The nominal_gain satisfies E b N o = E c I o + P .

Abstract: An apparatus and method for suppressing interference between a first signal transmitted from an antenna of a first communication system and a second signal received by a second communication system in proximity to the first communication system, including: a reflecting assembly equipped to the transmit antenna of the first communication system and a position adjusting assembly for varying the slope of the reflecting assembly, moving the reflecting assembly right and left, and changing the height of the reflecting assembly. The reflecting assembly includes a plurality of lattices, with a gap between lattices having a width of the wavelength of the first signal divided by a natural number, and further includes two reflecting panes made from aluminum that are symmetric about the adjusting assembly and each have a width equal to the length of the transmit antenna.

Abstract: A forward power control method in a PCS CDMA system to determine parameter values associates with the forward power control, which minimize interference imposed on neighboring cells by differentiating the amount of power allocation in accordance with the state of link of each subscriber, and maximize forward power control performance through a test in a laboratory by manipulating a channel change to have a sinusoidal form with a period.