Abstract:
The present invention relates to a broadband wireless access system, and more particularly, a ranging technique of a terminal using a legacy support frame in a mobile communication system including a legacy system and an advanced system. According to one form of an embodiment of the present invention, the ranging method of the terminal for a base station in the mobile communication system having the legacy system and the advanced system comprises the steps of: receiving secondary super frame header (S-SFH) information from the base station; determining whether a frame composition used in the mobile communication system supports the legacy system; acquiring ranging channel information for initial ranging, handover ranging, and periodical ranging from the S-SFH; and performing one or more ranging processes of the initial ranging, the handover ranging, and the periodical ranging in the base station by using the ranging channel information.
Abstract:
A method and apparatus for allocating a ranging channel for a synchronized mobile station in a wireless communication system is provided. A base station (BS) allocates the ranging channel for the synchronized mobile station in a first subframe and a first subband. An index of the first subframe and an index of the first subband are determined respectively based on an index of a second subframe and an index of a second subband in which a ranging channel of a non-synchronized mobile station is allocated.
Abstract:
Disclosed are a method and a device for transmitting uplink (UL) data in a wireless communication system. A cooperative device receives said UL data from a source device through a listening interval which is set within a TDD frame of said cooperative device, and transmits said UL data received from said source device to a base station through a UL subframe within the TDD frame of said cooperative device. At this time, said listening interval is overlapped with the UL subframe within the TDD frame of said source device.
Abstract:
A method of transmitting a signal using a prescribed frame structure in a wireless communication system is disclosed. A mobile station is able to transmit or receive a signal using a frame structure with a CP length corresponding to ¼ of a useful symbol. Moreover, the mobile station is able to transmit or receive a signal using a frame structure with a CP length corresponding to ¼ of a useful symbol, which is designed to mutually coexist without causing collision or interference with another frame structure with a different CP length. In this case, a channel bandwidth of the prescribed frame structure is 8.75 MHz.
Abstract:
A method of transmitting data in a wireless communication system includes preparing a frame including a unicast subframe for unicast data and an MBS (Multicast and Broadcast Service) subframe for MBS data; and transmitting the unicast data and the MBS data via the frame, wherein the MBS subframe includes an idle time during which data is not carried, and the idle time is arranged to be at the temporally latest position in the MBS subframe. An MBS frame structure for using an appropriate CP with respect to MBS signals transmitted from multi-cell is provided, so an unnecessary idle time can be reduced, and thus, the efficiency of limited radio resources can be improved.
Abstract:
A method of performing cell search includes receiving a primary synchronization signal (PSS) comprising a primary synchronization code (PSC) and receiving a secondary synchronization signal (SSS) comprising a first secondary synchronization code (SSC) and a second SSC, wherein the SSS includes a first SSS and a second SSS, the first SSC and the second SSC are arranged in that order in the first SSS, and the second SSC and the first SSC are arranged in that order in the second SSS. Detection performance on synchronization signals can be improved, and cell search can be performed more reliably.
Abstract:
A control channel generation method, a control channel decoding method, and a BS and an MS for implementing the methods are provided. The control channel generation method includes placing a frame control header (FCH) and a MAP within a TTI and generating a control channel for an enhanced communication system at a position after the MAP within the TTI. Another control channel generation method includes generating a control channel for the enhanced communication system and placing an FCH and a preamble at a position after the control channel. These methods enable implementation of an enhanced system that overcomes problems of the legacy system while minimizing influence exerted upon legacy MSs in the case where the base station generates a new control channel for a new MS or where an MS decodes a new control channel.
Abstract:
A data processing method for a hybrid automatic repeat request (HARQ) is provided. Specifically, modulation can be performed according to a constellation rearrangement version (CRV) to generate a sub-packet for an incremental redundancy HARQ (IR-HARQ). When a constellation symbol modulated according to the CRV is segmented into an even symbol and an odd symbol for a plurality of transmit antennas, an identical CRV is determined for a pair of the even symbol and the odd symbol subsequent to the even symbol. When the constellation symbol modulated according to the CRV is transmitted to a receiving side, a newly generated sub-packet is retransmitted upon receiving a non-acknowledgement (NACK) signal.
Abstract:
A method of transmitting a preamble for synchronization in a multiple-antenna system includes applying a masking sequence to a plurality of preambles, and transmitting each of the plurality of preambles, to which the masking sequence is applied, through each of a plurality of transmit antennas. In a multiple-antenna system, deterioration of reception performance for a preamble can be reduced.
Abstract:
A method for transmitting a preamble in a scalable bandwidth system is disclosed. The method includes transmitting a primary synchronization channel to which symbols are allocated at intervals of two or more subcarriers, through a specific bandwidth out of an entire system bandwidth at a start time point of a synchronization period, and transmitting a secondary synchronization channel through the specific bandwidth with a prescribed time difference from the primary synchronization channel at the synchronization period. A mobile station can use the same search routine irrespective of a system bandwidth, does not experience any difficulty at a cell edge in establishing signal timing synchronization, can simply perform preamble search, and can transmit a signal in a maximum usable bandwidth, thereby improving the accuracy of location measurement.