54 results about "Radio access station" patented technology

A method and apparatus for managing a buffer of a Radio Access Station (RAS) in a communication system are provided. An available buffer space determiner sets a threshold for each service class for scheduling packet input / output of the buffer according to priority of a service class, estimates and stores, upon receipt of a packet at the buffer, an available space size of the buffer after the packet reception, compares the estimated available space size of the buffer with a first threshold corresponding to a first service class indicative of a service class of the packet, and schedules packet input / output of the buffer according to the comparison result. A processor module schedules packet input / output of the buffer according to an output of the available buffer space determiner. The present invention can improve quality of services through service differentiation based on priorities of service classes and buffer management based on characteristics of the corresponding service traffics.

Disclosed is a method and apparatus for positioning a portable subscriber station (PSS) using a WiBro repeater, and a repeater having the apparatus. The method of positioning the portable subscriber station in a network having a radio access station (RAS) and a repeater, including the operations of: detecting a preamble signal transmitted from the RAS; generating a reference time by measuring a receiving time of the preamble signal and by compensating the receiving time of the preamble signal by taking into consideration a signal delay time between the RAS and the repeater; measuring a receiving time of a ranging signal received from the PSS on the basis of the reference time; and calculating the receiving time of the ranging signal by using a time stamp generated on the basis of the receiving time of the preamble signal.

The present invention relates to a ranging method using a bandwidth request code. For this purpose, the present invention provides a ranging method that includes transmitting a bandwidth request code for requesting a bandwidth for uplink traffic transmission from a radio access station, receiving a CDMA_Allocation_IE of a UL_MAP that includes uplink radio resource information from the radio access station, adjusting a transmission parameter according to an adjustment value included in the CDMA_Allocation_IE when periodic ranging performance is checked through the CDMA_Allocation_IE, checking whether the adjusted transmission parameter has an optimum value, and resetting a timer for periodic ranging, and a CDMA_Allocation_IE structure of a UL_MAP for the same. According to the present invention, delay in uplink data transmission of a portable subscriber station can be reduced by including a ranging parameter for a bandwidth request code in a UL_MAP, and a downlink bandwidth can be efficiently used by a radio access station by eliminating a process of RNG_RSP transmission.

A system and method for providing a multicast / broadcast service (MBS) using a Wireless Broadband Internet / World Interoperability for Microwave Access (WiBro / WiMAX) network are provided, which include an MBS control unit for generating a beginning and an end of an MBS bearer session, a quality of service (QoS) control unit for requesting an allocation and release of a QoS, an access control router (ACR) for allocating a multicast service flow identifier (SFID) with respect to the MBS bearer session in order to provide an MBS user terminal with MBS bearer traffic which is received from an MBS content source, and for releasing the allocated multicast SFID when the release of the QoS is requested, and a radio access station (RAS) for allocating a multicast connection identifier (CID) corresponding to the allocated multicast SFID according to whether an MBS user requests the MBS bearer traffic, and controlling a radio resource with the MBS user terminal.

A method for setting a multicast and broadcast service (MBS) of a broadband wireless access system includes: previously receiving and storing the information on the MBS setting from a MBS server by a radio access station; and broadcasting the information on the MBS setting stored in the PSS, which exists in the service area of the radio access station, by the radio access station. In the step of broadcasting the information on the MBS setting, a preset pilot tone, uplink / downlink information, or the sub-carriers unused in bandwidth of the system are used for broadcasting the information.

An information service apparatus and method in a wireless communication system are provided. A method of operating a Radio Access Station (RAS) includes receiving information regarding business offices located in a cell coverage area of the RAS from a network entity of a core service network, classifying the received business office information according to a plurality of items and storing the classified information in a Data Base (DB), allocating a Multicast Connection IDentifier (MCID) for each item, determining a transmission period for each item, obtaining a business office list of a corresponding item from the DB when a Transmit (Tx) time elapses according to the Tx period, generating an advertisement multicast burst including the obtained business office list, and multicasting the generated burst to pre-registered Mobile Stations (MSs).

A method and system for WiBro network interworking in a wireless terminal. The method includes: setting up, by a relay station for connecting the WLAN terminal with the WiBro network, a connection through an initial process with the WiBro network; performing, by an access router, Internet connection authentication on a user of the WLAN terminal in response to a request for Internet connection from the WLAN terminal; allocating, by the access router, an IP address in response to a request for IP address allocation from the WLAN terminal, and then allocating, by a WiBro radio access station, a unique Connection IDentification (CID) corresponding to a QoS level of the terminal user in response to a request from the relay station; and mapping, by the relay station, the allocated unique CID to the IP address of the WLAN terminal and providing Internet service.

A method of treating signals in a bridge-based radio access station backbone network including a plurality of base station bridges (BSBs), with each BSB having a 2-tiered switch connected with a plurality of radio access stations. A plurality of SCBs (Site Core Bridges), each of having a 2-tiered switch for constituting the core network, includes the steps of buffering by the SCB a predetermined number of previously-transmitted frames when operating as a crossover bridge, and causing the SCB to retransmit selected ones of the buffered previously-transmitted frames to a terminal in response to a handover completion signal.

A bridge-based RAS backbone network system and a signal processing method therefor are provided. In the bridge-based RAS backbone network system, a plurality of BSBs with Layer 2 (L2) switches are connected to a plurality of RASs, anda plurality of SCBs with L2 switches are connected to part of the BSBs in a lower layer, forming a core network. An HLR manages configuration information of network entities by storing the IP addresses and MAC addresses of MNs within the network and the addresses of SCBs to which the MNs belong in a table. Each of the SCBs statically preserves the MAC address of an external default router, for relaying an egress frame, statically registers its individual MAC address in other SCBs in the core network beforehand, detects a destination MN through the HLR, and sends a frame to the SCB of the destination MN or the MAC address of the external default router.

Provided are a method and a system for transmitting mobile IP packets without loss. The method includes the steps of storing, by an old radio access station, packets that are not transmitted to a mobile terminal when a handover indication message is received, and creating, by the old radio access station, a tunnel to a new radio access station, and transmitting the stored packets to the new radio access station via the tunnel when a link-layer handover procedure is completed. Thus, upon the handover of the mobile terminal, IP packets directed to the old access control router and the old radio access station are stored in the buffer and then transmitted via the tunnel after the handover, thereby preventing loss of packets during the handover. Thus, yield cannot be degraded upon the handover and seamless network connection service can be provided.

A terminal hand-off apparatus in a wireless broadband Internet system and a terminal hand-off method in the system includes a connection processor and a hand-off processor. The connection processor predicts a movement direction using a current position of the terminal in communication with a counterpart terminal using a predetermined Internet Protocol (IP) address, and requests an IP address to be assigned upon entering a coverage area of at least one of a plurality of Radio Access Stations (RASs) located near the predicted movement direction. The hand-off processor transmits at least one IP address assigned from the RAS whose coverage area has been entered to the counterpart terminal, and requests the counterpart terminal to transmit data to the IP address assigned by the RAS upon hand-off to one of the plurality of RASs assigning the at least one IP address.

A method and apparatus of allocating downlink power in a radio access station system are disclosed. The method of allocating transmission power to a plurality of terminals in a radio access station system according to the present invention includes (A-1) calculating an allocation power for the respective terminals based on downlink quality information of the respective terminals; (A-2) calculating a minimum requirement power for the respective terminals based on the downlink quality information; and (A-3) allocating the transmission power by distributing part of excess power of a first terminal group having the allocation power higher than the minimum requirement power to the second terminal group having the allocation power lower than the minimum requirement power, and the part of excess power is a sum of insufficient power of the second terminal group. As a result, the loss of the quantity of service transmission of the radio access station is reduced and service areas can be expanded.

A repeater including a downlink signal processor, which receives a downlink frame from a radio access station (RAS) and transmits the downlink frame to a portable Internet terminal, and an uplink signal processor, which receives an uplink frame from the portable Internet-terminal and transmits the uplink frame to the RAS, is provided, including: an ID storage unit to store identification (ID) information of the repeater; switches to switch a signal transmission path so that the downlink frame can be transmitted to the portable Internet terminal through the downlink signal processor, or the uplink frame can be transmitted to the RAS through the uplink signal processor; and a switch control unit to control the switches such that the ID information of the repeater is inserted into part of the downlink frame and the downlink and uplink frames are transmitted.

A handover control method and apparatus are provided to efficiently buffer packets in a Mobile Worldwide Interoperability for Microwave Access (WIMAX) network. A serving radio access station (S-RAS) and an access control router (ACR) divide and buffer packets to be sent to a mobile station before and after a predetermined message exchange process. The Access control router (ACR) sequentially tunnels a packet buffered in the serving radio access station (S-RAS) and a packet buffered in the Access control router (ACR) into a target radio access station (T-RAS) when a handover for the mobile station is completed. Since an unnecessary buffering operation is not performed in the Access control router (ACR) and the radio access station (RAS), a resource waste may be avoided.

Disclosed is a data transmission method for an MBS in a broadband wireless access system. The method includes the steps of constructing a Wibro frame by adding an FEC zone to a downlink portion of the Wibro frame by a radio access station, the FEC zone containing an FEC packet for performing a packet-based FEC scheme; and transmitting data to a plurality of mobile stations by the radio access station, the Wibro frame constructing the data.

Disclosed is an apparatus and a method for implementing efficient redundancy and an expanded service coverage in a Radio Access Station (RAS) system. In the RAS system, if the main processor unit generates switching control signals in response to the sensed failures on sensing a failure in any of the channel cards and the transceivers or a failure in any of the high-power amplifiers, all supporting M (i.e., the number of FAs equal to or more than three) and K (i.e., the number of sectors equal to or more than three), between the transceivers and the predetermined Time Division Duplex (TDD) switches connected to the antennas, the RF switch unit switches a path based on the generated switching control signals so as to substitute the failed module either by one additional redundancy transceiver per M and K or by one additional redundancy high-power amplifier per M and K. As a result, an efficient N+1 redundancy structure is embodied.

The present invention relates to a system and method of routing packets using an IP address in portable Internet, in which an individual IP address is given to a portable Internet terminal attempting to access the portable Internet via a certain radio access station, thereby routing packets without interruption of a packet data service using the IP address. According to the present invention, in a portable Internet system, a routing path for the packet data service is updated in real time using an IP address given to a respective portable Internet terminal while the terminal is moved, thereby continuously using the packet data service without an interruption in the service while the terminal freely moves to a different radio access station. Also, an interface between a radio access station and an access control router system is embodied as an L2 switch to perform real-time packet routing by combining routing and switching technologies, thereby reducing a load for routing packets, quickly routing packets, and reducing a loss of packet data.

Improving a transmission latency of a Transmission Control Protocol (TCP) is provided. The apparatus includes a communicator transmitting a message for measuring power of a transmission signal to a radio access station (RAS) and receiving a response message corresponding to the message from the RAS; a TCP manager instructed by a controller to check and store a round trip time (RTT) required for receiving an acknowledgement (ACK) corresponding to data, which is transmitted from the portable terminal to the RAS; and the controller instructing the TCP manager to measure the RTT for measuring a retransmission timeout (RTO).

A signal processing method in a bridge-based RAS backbone network system is provided, in which an MN within a network periodically transmits to an HLR a route-update message for registration updating, if the MN is in active mode and transmits to the HLR a paging-update message having a transmission period longer than that transmission period of the route-update message, for registration updating, if the MN is in idle mode, each of bridges and the HLR stores location information about the MN in a soft state with an age set for the location information in a routing cache according to the route-update message received from the MN, and each of BSBs, SCBs, and an SIB selected from a plurality of SIBs stores location information about the MN in a soft state with an age set for the location information according to the paging-update message received from the MN.

An IPv6 address configuration method for a terminal in a wireless mobile network and an apparatus therefor are provided. In the wireless mobile network, an Internet Protocol version 6 (IPv6) address configuration apparatus is provided to a router (access control router; ACR) or a base station (radio access station; RAS). In the address configuration apparatus, a MAC access procedure is performed to extract information required for IPv6 address allocation procedure, and the address is configured by using available fields of a message. In addition, a duplicate address detector (DAD) in which the terminal directly takes part is omitted by using information on the router (ACR) or the base station (RAS). In addition, during the IPv6 address configuration procedure, in order to prevent messages of IPv6 from being transmitted in a wireless region, an agent for address configuration is provided to the terminal. The router (ACR) acquires information required for the address configuration by using a portion of fields of MAC management messages. Accordingly, in the wireless mobile network, it is possible to reduce a time taken for an initial access procedure in which an IPv6 address is allocated to the terminal and to reduce consumption of wireless resource.

Provided are a broadband wireless access communication system, and a method for assigning a frequency assignment (FA) to a newly accessing portable subscriber station (PSS) when a radio access station in a portable Internet system serves a number of FAs. The method for assigning a FA includes the steps of: receiving a connection request signal from a PSS through a primary FA; acquiring a MAC address of the PSS in a connection initialization process with the PSS; acquiring information on the number of available FAs in a sector receiving the connection request signal; determining a FA for the PSS based on the MAC address and the number of the FAs; transmitting the determined FA information to the PSS; and changing the FA of the PSS from the primary FA to the determined FA.

A method and apparatus of allocating downlink power in a radio access station system are disclosed. The method of allocating transmission power to a plurality of terminals in a radio access station system according to the present invention includes (A-1) calculating an allocation power for the respective terminals based on downlink quality information of the respective terminals; (A-2) calculating a minimum requirement power for the respective terminals based on the downlink quality information; and (A-3) allocating the transmission power by distributing part of excess power of a first terminal group having the allocation power higher than the minimum requirement power to the second terminal group having the allocation power lower than the minimum requirement power, and the part of excess power is a sum of insufficient power of the second terminal group. As a result, the loss of the quantity of service transmission of the radio access station is reduced and service areas can be expanded.

Provided are a method and a system for transmitting mobile IP packets without loss. The method includes the steps of storing, by an old radio access station, packets that are not transmitted to a mobile terminal when a handover indication message is received, and creating, by the old radio access station, a tunnel to a new radio access station, and transmitting the stored packets to the new radio access station via the tunnel when a link-layer handover procedure is completed. Thus, upon the handover of the mobile terminal, IP packets directed to the old access control router and the old radio access station are stored in the buffer and then transmitted via the tunnel after the handover, thereby preventing loss of packets during the handover. Thus, yield cannot be degraded upon the handover and seamless network connection service can be provided.

A method and apparatus for managing a buffer of a Radio Access Station (RAS) in a communication system are provided. An available buffer space determiner sets a threshold for each service class for scheduling packet input / output of the buffer according to priority of a service class, estimates and stores, upon receipt of a packet at the buffer, an available space size of the buffer after the packet reception, compares the estimated available space size of the buffer with a first threshold corresponding to a first service class indicative of a service class of the packet, and schedules packet input / output of the buffer according to the comparison result. A processor module schedules packet input / output of the buffer according to an output of the available buffer space determiner. The present invention can improve quality of services through service differentiation based on priorities of service classes and buffer management based on characteristics of the corresponding service traffics.

A handover method of a mobile station (MS) in a mobile communication system having MSs and radio access stations (RASs), each of which includes an IEEE 802.16 standard-based medium access control (MAC) layer and an Internet protocol version 6 (IPv6)-based IP layer. The handover method includes the step of gathering IP network information of a neighbor RAS through a message exchange with a previous RAS. A target RAS for handover based on the gathered IP network information of the neighbor RAS is determined, after the target RAS is determined, the previous RAS tunnels data for targeting the MS to the target RAS, Then the tunneled data are received from the target RAS.

The present invention relates to a wireless communication system, and more particularly, to a frequency reusing method for efficiently transmitting traffics in a radio access station system. A frequency reusing method in a wireless communication system including a coverage region, which has first, second and third regions comprises (a) transmitting traffics by assigning a total frequency band, which includes different three sub-frequency bands, to the first, second and third regions during a first interval; and (b) transmitting the traffics by respectively assigning the different three sub-frequency bands to the first, second and third regions during a second interval.

Disclosed is a portable internet system, and more particularly, to a method of supporting fast ranging upon handover. The method comprises calculating an action time based on a time when a handover confirmation message is received from a serving Radio Access Station (RAS), in a target RAS; and transmitting a fast ranging information message to a mobile station on the basis of the action time.

A frequency reusing method in a wireless communication system including a coverage region, which has first, second and third regions, and a radio access station (RAS) transmitting a traffic to a portable subscriber station (PSS) in the coverage region, comprises (a) transmitting the traffics by assigning an identical frequency band to the first, second and third regions during a first interval; (b) transmitting the traffics by assigning the identical frequency band to the first region during a second interval; (c) transmitting the traffics by assigning the identical frequency band to the second region during a third interval; and (d) transmitting the traffics by assigning the identical frequency band to the third region during a fourth interval.