Abstract:
Disclosed is a method and device for transmitting and receiving a signal by using modulation techniques in a wireless communication system. The method according to the present invention includes: selecting one of QAM and improved QAM according to at least one predefined criterion; encoding information bits to be transmitted according to a first encoding scheme and mapping encoded information bits to QAM symbols when the QAM is selected; encoding information bits to be transmitted according to a second encoding scheme and mapping encoded information bits to improved QAM symbols when the improved QAM is selected; and transmitting the QAM symbols or the improved QAM symbols through a given resource region.
Abstract:
An apparatus and a method for access authentication of a mobile station in a wireless communication system are provided. The method includes receiving a session certificate for the access authentication from a core network, transmitting the session certificate to a new access network during a handover to the new access network, and receiving an authentication result based on the session certificate from the new access network.
Abstract:
A circuit includes a controller to determine whether to prohibit entry of an end unit to a base station in a wireless communication network, the controller configured to process a media access control (MAC) management message that includes a timer value, the timer value designating a time period during which entry is prohibited.
Abstract:
A method for operating a random access channel (RACH) by a base station (BS) performing beamforming with at least one receive chain includes broadcasting RACH configuration information; and receiving an RACH signal with at least one receive chain, wherein the RACH configuration information includes threshold information to divide an RACH groups into a first group and a second group. A BS for operating a RACH by performing beamforming with at least one receive chain in a communication system, the BS comprising a controller configured to broadcast RACH configuration information and control at least one receive chain to receive an RACH signal, wherein the RACH configuration information includes threshold information to divide RACH groups into a first group and a second group. Other embodiments including a user equipment are also disclosed.
Abstract:
A method for routing data by a Corresponding Mobility Agent (CMA) in a mobile communication system is provided. The method includes managing mobility for a Mobile Station (MS) with a Mobile Access Gateway (MAG), and routing a data packet between a Corresponding Node (CN) and the MS based on a location of the MS, wherein the CMA is mapped to an application server which provides an application service.
Abstract:
A method for optimizing a data-path by a source Base Station (BS) in a mobile communication network includes determining whether a tunnel among new BSs is set up while tracking a data-flow for a Mobile Station (MS), if the tunnel among the new BSs is set up, determining whether there is a bounce-back, if there is at least one bounce-back, transmitting a first message for detecting a root of an arbitrary bounce-back among the at least one bounce-back and setting up a short-cut tunnel to other end of the arbitrary bounce-back, and after transmitting the first message, receiving a second message including bounce-back root information indicating the root of the arbitrary bounce-back from the other end of the arbitrary bounce-back. Other various embodiments including a source BS, a target BS, and a backhaul network are also disclosed.
Abstract:
A modulation method and an apparatus with consideration of adaptive Hybrid Automatic Repeat reQuest (HARQ) in a wireless communication system are provided. The method of a transmission end supporting a hybrid modulation technique in which different types of modulation schemes are mixed, information of a channel state with a reception end is collected. A modulation order of a first type of a modulation scheme and a modulation order of a second type of a modulation scheme are determined. The modulation order of a first type of a modulation scheme and a modulation order of a second type of a modulation scheme form the hybrid modulation technique.
Abstract:
A method for optimizing a data-path by a source Base Station (BS) in a mobile communication network includes determining whether a tunnel among new BSs is set up while tracking a data-flow for a Mobile Station (MS), if the tunnel among the new BSs is set up, determining whether there is a bounce-back, if there is at least one bounce-back, transmitting a first message for detecting a root of an arbitrary bounce-back among the at least one bounce-back and setting up a short-cut tunnel to other end of the arbitrary bounce-back, and after transmitting the first message, receiving a second message including bounce-back root information indicating the root of the arbitrary bounce-back from the other end of the arbitrary bounce-back. Other various embodiments including a source BS, a target BS, and a backhaul network are also disclosed.
Abstract:
Disclosed is a system and a method of signal transmission/reception by a mobile station in a wireless communication system. The method includes: transmitting a first sub-band preparation indicator, which indicates that the mobile station has been prepared for transmission/reception of a signal through a first sub-band, to a base station through a primary band; transmitting a first sub-band failure indicator to the base station through the primary band upon detecting failure in transmitting the first sub-band preparation indicator; receiving sub-band information on a second sub-band, which is different from the first sub-band, from the BS through the primary band; and acquiring synchronization with the second sub-band, so as to enable transmission/reception of a signal through the second sub-band based on the sub-band information.