Patent application number | Description | Published |
20080225788 | Resource allocation control method and device in mobile radio communications system - For radio communications between a base station and a mobile station, resource allocation within a resource block including control resources used for control signals (CQI, ACK/NACK) and reference resources used for a reference signal is performed. The base station measures the quality of a channel between the mobile station and the base station itself. Based on the measured channel quality, the base station sets a ratio between resources for the control signals CQI and ACK/NACK in the control resources, and notifies the mobile station of the set resource ratio. | 09-18-2008 |
20080253484 | METHOD AND APPARATUS FOR REFERENCE SIGNAL GENERATION IN WIRELESS COMMUNICATION SYSTEM - To provide a reference signal generation method and apparatus capable of obtaining many reference signal sequences having excellent properties. CAZAC sequences that satisfy the condition that the absolute value (|N−L|) of a difference between a sub-carrier number N in a resource block and a CAZAC sequence length L is not larger than a threshold value K are selected, and a sequence having a largest among greatest prime factors among the prime factors constituting the sequence length(s) is further selected from the initially selected sequences. Then, a reference signal sequence(s) is generated from a selected CAZAC sequence. | 10-16-2008 |
20080318608 | METHOD AND DEVICE FOR ASSIGNING REFERENCE SIGNAL SEQUENCES IN MOBILE COMMUNICATIONS SYSTEM - A reference signal sequence assignment method and device are provided by which the influence of inter-cell interference can be reduced and the number of usable cyclic shifted sequences per sector can be increased. In a mobile communications system with a structure including multiple cells each including multiple sectors, a sequence assignment method is employed by which pseudo-orthogonal sequences used for reference signals are assigned to cells or sectors. According to this method, the multiple pseudo-orthogonal sequences are assigned to cells or sectors by using multiple repetition patterns. | 12-25-2008 |
20090011765 | MOBILE COMMUNICATION SYSTEM, ITS SCRAMBLE CODE ASSIGNING METHOD, MOBILE STATION, AND BASE STATION - An object of the present invention is to reduce the amount of calculation performed in a mobile station and amount of information exchanged between a base station and mobile station in a mobile communication system where the base station autonomously assigns a scramble code. In the mobile communication system, the base station starts communication by using a predetermined initialization scramble code used only at its activation time. The mobile station positioned in a cell determines whether the scramble code identified upon cell search time is the initialization scramble code. Only when the scramble code is the initialization scramble code, the mobile station determines a candidate scramble code, determines whether the candidate scramble code is usable in communication, and notifies the base station of the control information including the determination result. Based on the control information, the base station determines a service scramble code to be used, from the candidate scramble codes, and applies the service scramble code to start communication. | 01-08-2009 |
20090028102 | RESOURCE ASSIGNMENT METHOD FOR COMMUNICATION SYSTEM ADAPTED FOR CHANGE OF CHANNEL - A resource assignment method for a communication system provides a method to realize an estimate of channel with high accuracy for terminals which change channels rapidly. A resource assignment unit ( | 01-29-2009 |
20090052427 | SINGLE CARRIER TRANSMISSION SYSTEM, COMMUNICATION DEVICE, AND SINGLE CARRIER TRANSMISSION METHOD USING FOR THEM | 02-26-2009 |
20090060064 | OFDM Communication System, Method for Generating Feedback Information Thereof, and Communication Apparatus - An OFDM communication system which performs appropriate feedback flexibly adapted to channel states, while suppressing an amount of feedback information. The OFDM communication system has first and second communication apparatuses. In a second receiver of the second communication apparatus, a channel quality measurement part measures channel quality for each of sub-carriers. A time variation measurement part and a frequency measurement part respectively measure variation of channel quality in a time domain and a frequency domain, respectively, and output the variation of channel quality as time variation information and frequency variation information, also respectively. Based on the measured time variation information and frequency variation information, a two-dimensional control part performs two-dimensional blocking for forming two-dimensional blocks each from plural adjacent sub-carriers which are adjacent to each other in the time domain and the frequency domain. The two-dimensional control part measures and outputs channel quality of each two-dimensional block, as feedback information. | 03-05-2009 |
20090097465 | PILOT SIGNAL TRANSMISSION METHOD AND RADIO COMMUNICATION APPARATUS - In a radio communication system, transmission of CAZAC sequences as the pilot signal sequences by using code division multiplexing as at least one of user multiplexing schemes, is done by dividing a system band as a frequency band usable in the system into frequency blocks B | 04-16-2009 |
20090122886 | TRANSMITTING/RECEIVING SYSTEM, TRANSMITTING APPARATUS, AND PILOT SIGNAL MULTIPLEXING METHOD USED IN THEM - At a transmitting side ( | 05-14-2009 |
20090201950 | BAND LIMITING METHOD AND WIRELESS COMMUNICATION SYSTEM - A receiver estimates a channel quality. A transmitter amplifies a signal by a gain proportional to a difference between a required signal-to-noise power ratio and channel quality information, which is an estimation result of the channel quality, and transmits the signal so that the receiver can obtain the signal-to-noise power ratio. In this case, the receiver or the transmitter determines a roll-off rate of an adaptive filter based on the channel quality information. The transmitter uses the adaptive filter of the determined roll-off rate to filter and transmit the signal. | 08-13-2009 |
20090239570 | METHOD FOR HANDOVER BETWEEN DIFFERENT RADIO ACCESS SCHEMES AND WIRELESS COMMUNICATION SYSTEM - In a wireless communication system including a plurality of base stations each supporting at least one of two or more radio access schemes and at least one mobile station capable of performing communication by using the two or more radio access schemes, before the mobile station moves from a source base station to a target base station, the target base station notifies the mobile station, via the source base station, of a transparent container containing uplink radio access information that specifies a radio access scheme enabling at least an initial connection to be made. Thus, the mobile station identifies the radio access scheme supported by the target base station from the transparent container before moving from the source base station to the target base station. | 09-24-2009 |
20090257398 | RADIO COMMUNICATION SYSTEM AND COMMUNICATION METHOD - A radio communication system includes a plurality of base stations with supporting a plurality of radio access schemes. Two or more base stations support a predetermined radio access scheme in common. A mobile station makes initial connection to one of the two or more base stations according to the predetermined radio access scheme, to allow communication with the one base station. | 10-15-2009 |
20100157885 | SYNCHRONIZATION SYSTEM AND SYNCHRONIZING METHOD FOR PLURALITY OF BASE STATIONS AND MOBILE STATION IN A FORWARD LINK WIRELESS TRANSMISSION - There is provided a radio communication system in which a mobile station which has decided to switch a base station can immediately be synchronized with the base station to which switching is to be made. Each of the base stations creates a synchronization signal for the mobile station to synchronize with the base station from an upstream pilot signal received from the mobile station, creates upstream propagation quality information from the upstream pilot signal, and creates a downstream control signal including the synchronization information and the upstream propagation quality information, and transmits them. The mobile stations creates an upstream pilot signal, transmits the signal, receives a signal including a downstream control signal from each of the base stations, extracts the upstream propagation quality and information on synchronization with the base stations from the received downstream control signal, and selects an optimal base station from the received upstream propagation quality as a new current base station. If the selected base station is different from the current base station, the transmission timing of the upstream pilot signal is modified to the transmission timing based on the synchronization information extracted from the downstream control signal of the selected base station and transmitted. | 06-24-2010 |
20100329199 | WIRELESS COMMUNICATION SYSTEM, BASE STATION , RESOURCE BLOCK ALLOCATION METHOD, AND PROGRAM - A scheduling technique for limiting a discontinuous spectrum to reduce control information to be transmitted from a base station (BS) to each of mobile stations. The method has a ranking means for ranking the mobile stations for each resource block depending on the channel status, and an allocation means for allocating the resource blocks to the mobile stations depending on the ranking of the mobile stations so that the number of resource blocks in a resource block group for one mobile station may be not more than a set number. The resource block group including at least one or more continuous resource blocks on the frequency axis. | 12-30-2010 |
20110002282 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION SETTING METHOD, BASE STATION, MOBILE STATION, AND PROGRAM - The problem is that, in a mobile wireless system, when more than one frequency block composed of resource blocks that are consecutive on a frequency axis is assigned to one mobile station, the multi-diversity effect due to scheduling increases by the number of assigned frequency blocks being increased, but the overhead caused by the scheduling information increases. Accordingly, there is a tradeoff between the multi-diversity effect and the scheduling overhead. However, when the aforementioned tradeoff was considered with OFDM and SC-FDMA, the same fixed number of frequency blocks would have been used for all mobile stations. Accordingly, an optimization that takes into account the tradeoff between the multi-diversity effect and scheduling overhead has not been sufficiently achieved. In a wireless communication system, the maximum frequency block number, which is the maximum number of the aforementioned frequency blocks assigned to the same mobile station, is set based on system information, which is information pertaining to the base station installation environment and the mobile station or the mobile station's communication status, and the base station assigns no more resource blocks than the aforementioned maximum frequency block number. | 01-06-2011 |
20110110322 | RESOURCE ALLOCATION METHOD, IDENTIFICATION METHOD, RADIO COMMUNICATION SYSTEM, BASE STATION, MOBILE STATION, AND PROGRAM - To solve a problem that although the increase of the number of frequency blocks by allocating discontinuous subcarriers (RBs) as in OFDM enables an increase in multi-diversity effect and an improvement in throughput, the number of RB allocation patterns increases with the increase of the number of frequency blocks, resulting in an increase in the amount of information relating to the allocated RBs, the resource block allocation unit is determined when resource blocks discontinuous on the frequency axis are allocated to a terminal, and the number of bits of scheduling information indicating the allocated resource blocks by using Tree Based is set to the number of bits corresponding to the determined allocation unit. | 05-12-2011 |
20110113433 | RESOURCE ALLOCATION METHOD, IDENTIFICATION METHOD, BASE STATION, MOBILE STATION, AND PROGRAM - Provided is a technique capable of reporting resource block allocation information with no waste when an allocated resource block is reported, because in the current LTE downlink, the waste of the amount of resource allocation information increases in some cases since a restriction is imposed such that 37-bit fixed scheduling information is transmitted. A resource block group consisting of at least one or more resource blocks continuous on the frequency axis is allocated to a terminal, and the number of controlling signals for reporting allocation information indicating the allocated resource blocks is determined. | 05-12-2011 |
20110211538 | COMMUNICATION SYSTEM, AND DEVICE, METHOD, AND PROGRAM USED FOR SAME - A communication system comprises a base station and a mobile station. The base station has resource allocating means for associating basic resources which are M unit resources (M is two or more integer) of a first control channel through which first control information is transmitted with the resources of a second control channel through which second control information is transmitted, allocating at least a part of the basic resources to the first control information, and associating the first control information with the resources of the second control channel corresponding to one of the basic resources allocated to the first control information and first control information transmitting means for transmitting the allocated first control information to the mobile station. The mobile station has second control information transmitting means for receiving the first control information and transmitting second control information by using the resources of the second control channel associated with the first control information. | 09-01-2011 |
20110235604 | COMMUNICATION SYSTEM, COMMUNICATION METHOD, BASE STATION, MOBILE STATION, AND PROGRAM - Provided is a technique for efficiently selecting access schemes for use in communications. This invention includes an identifying means that identifies, from station-on-the-other-end candidate information, which is control information in which information related to an access scheme corresponding to each of a plurality of stations-on-the-other-end of communication is described, and from information related to an access scheme corresponding to the local station, access schemes beforehand one of which can be used in communication with a communication partner station; and a selecting means that selects, as the access scheme to be used in data communication with a communication partner station, one of the identified access schemes when the data communication is started. | 09-29-2011 |
20120008615 | WIRELESS COMMUNICATION SYSTEM, BASE STATION, TERMINAL, WIRELESS COMMUNICATION METHOD, AND PROGRAM - Provided is a wireless communication technique capable of supporting communication using a single component carrier, and communication using a plurality of component carriers. The communication using the plurality of carriers is characterized by using a different signal sequence in each of the carriers, and using the signal sequences as reference signals. The present invention makes it possible to cope with the communication employing a single component carrier and the wireless communication employing a plurality of the component carriers. Further, PAPR of the reference signals can be made small because there is no possibility that the identical CAZAC sequence is used among the component carriers when a plurality of the component carriers are employed. | 01-12-2012 |
20120009962 | COMMUNICATION SYSTEM, USER EQUIPMENT, BASE STATION, TRANSMIT POWER DECIDING METHOD, AND PROGRAM - This invention has been accomplished in consideration of problems, and an object thereof is to provide a technology that enables a maximum transmit power suitable for each user equipment. This invention is a communication system, is characterized in deciding a maximum value of a transmit power of a user equipment by employing at least one of an access scheme and control information indicating a content of a communication control. | 01-12-2012 |
20120026962 | WIRELESS COMMUNICATION SYSTEM, BASE STATION, SERVER, WIRELESS COMMUNICATION METHOD, AND PROGRAM - Provided is a wireless communication technique capable of supporting communication using a single component carrier, and communication using a plurality of component carriers. The communication using the plurality of carriers comprises a processing means for performing the signal processing in accordance with each of the carriers with respect to the common signal sequence used by the plurality of carriers. The present invention makes it possible to cope with the communication employing a single component carrier and the wireless communication employing a plurality of the component carriers. Further, PAPR of the reference signals can be made small because there is no possibility that the identical CAZAC sequence is used among the component carriers when a plurality of the component carriers are employed. | 02-02-2012 |
20120170538 | WIRELESS COMMUNICATION SYSTEM, PILOT SEQUENCE ALLOCATION APPARATUS, PILOT SEQUENCE ALLOCATING METHOD USED FOR THE SYSTEM AND APPARATUS, AND MOBILE STATION USED IN THE METHOD - A mobile station in a wireless communication system including a base station, and a method for the mobile station includes a unit that sends a pilot signal to the base station. A sub-frame used for sending the pilot signal includes a first pilot block and a second pilot block. A first Zadoff-Chu sequence allocated to the first pilot block is different from a second Zadoff-Chu sequence allocated to the second pilot block. | 07-05-2012 |
20120178484 | COMMUNICATION SYSTEM, COMMUNICATION METHOD, BASE STATION, USER EQUIPMENT, AND THEREIN PROGRAM - The object of the present invention is to provide a technology of deciding CoMP point dynamically by considering the spectrum efficiency after channel-dependent scheduling with different possible combinations of CoMP points. According to the present invention, A wireless communication system, characterized in deciding number of CoMP (coordinated multipoint transmission and reception) point to a user equipment by using information related to scheduling. | 07-12-2012 |
20120230224 | MOBILE COMMUNICATION SYSTEM, RELAY STATION, AND BASE STATION - A mobile communication system includes a base station and a relay station. The base station transmits carrier information to the relay station during connection of a first radio link using a first carrier. The carrier information indicates at least one candidate carrier available for performing multi-carrier communication on the first radio link. The relay station transmits, to the base station, request information about a configuration of the first radio link for the at least one candidate carrier indicated by the carrier information. The base station further determines, in response to receiving the request information from the relay station, a second carrier used with the first carrier for the multi-carrier communication. | 09-13-2012 |
20120264368 | MOBILE COMMUNICATION SYSTEM, RELAY STATION, BASE STATION, CONTROL METHOD THEREOF, AND COMPUTER READABLE MEDIUM - A mobile communication system includes a base station and a relay station. The relay station acquires a donor cell list indicating at least one candidate cell that can be used for a backhaul link. The relay station or the base station determine a donor cell used for the backhaul link from the donor cell list based on both first and second cell management information. The first cell management information relates to the at least one candidate cell and originates from the at least one base station. The second cell management information originates from the relay station. | 10-18-2012 |
20120269159 | METHOD FOR MULTIPLEXING CONTROL SIGNALS AND REFERENCE SIGNALS IN MOBILE COMMUNICATIONS SYSTEM - A reference signal multiplexing method for multiple mobile stations includes: grouping together control signals for the multiple mobile stations; and multiplexing reference signals corresponding to the control signals by CDM over the same bandwidth as that of grouped control signals. | 10-25-2012 |
20120276908 | SYNCHRONIZATION SYSTEM AND SYNCHRONIZING METHOD FOR PLURALITY OF BASE STATIONS AND MOBILE STATION IN A REVERSE LINK WIRELESS TRANSMISSION - There is provided a wireless communication system which can synchronize a mobile station with a destination base station in response to the mobile station determining to switch base stations. Each base station generates synchronization information to synchronize the mobile station with the base station from a reverse pilot signal received from the mobile station, generates reverse propagation quality information from the reverse pilot signal, and generates and transmits a control signal including the synchronization information and the reverse propagation quality information. A mobile station generates and transmits a reverse pilot signal, receives a signal including the control signal from each of the base stations. | 11-01-2012 |
20120281665 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION SETTING METHOD, BASE STATION, MOBILE STATION, AND PROGRAM - A wireless communication system including a base station and a mobile terminal, includes a setting unit to set a number of sets of at least one or more resource blocks for the mobile terminal, the at least one or more resource blocks of each set being consecutive in frequency. An allocation unit allocates the resource blocks for a transmission channel so that the resource blocks are not contiguous in frequency. A controller generates a reference signal sequence corresponding to a bandwidth of the allocated resource blocks, and maps the reference signal sequence to subcarriers according to an allocation of the resource blocks. | 11-08-2012 |
20120307766 | COMMUNICATION SYSTEM, BASE STATION, MOBILE STATION, METHOD FOR MOBILE STATION, AND METHOD FOR COMMUNICATION SYSTEM - A mobile station in a communication system including a base station, the mobile station includes a unit for sending a signal that allocates a plurality of different Zadoff-Chu sequences to a frame to the base station. | 12-06-2012 |
20130003701 | METHOD FOR HANDOVER BETWEEN DIFFERENT RADIO ACCESS SCHEMES AND WIRELESS COMMUNICATION SYSTEM - In a wireless communication system including a plurality of base stations each supporting at least one of two or more radio access schemes and at least one mobile station capable of performing communication by using the two or more radio access schemes, before the mobile station moves from a source base station to a target base station, the target base station notifies the mobile station, via the source base station, of a transparent container containing uplink radio access information that specifies a radio access scheme enabling at least an initial connection to be made. Thus, the mobile station identifies the radio access scheme supported by the target base station from the transparent container before moving from the source base station to the target base station. | 01-03-2013 |
20130090055 | RADIO COMMUNICATION SYSTEM AND CONTROL METHOD OF RADIO RESOURCE ALLOCATION - A communication system includes a plurality of nodes including a base station; at least one terminal; and at least one relay node through which each terminal can be connected to the base station. An entity in a network higher in layer than each relay node configures the relay node to set a target value for a predetermined parameter reflecting a radio link status of the relay node. The relay node monitors the predetermined parameter to notify an upper-layer node of difference information corresponding to a difference between the target value and a monitored parameter value. The upper-layer node controls a link parameter of a radio link connecting the upper-layer node and the relay node depending on the difference information, resulting in efficient radio resource allocation in a relay network with small signaling overhead. | 04-11-2013 |
20130121305 | REFERENCE SIGNAL MULTIPLEXING AND RESOURCE ALLOCATION - A reference signal of a user equipment to which a resource (LB# | 05-16-2013 |
20130196678 | SCHEDULING METHOD AND SYSTEM FOR COORDINATED MULTIPOINT TRANSMISSION/RECEPTION - A scheduling system for coordinated user equipments (UEs) in a network including a plurality of communicating points which can communicate with each other, wherein the coordinated UEs are supported by a serving point and are coordinated with a neighbor point, is characterized in that the serving point and the neighbor point share information related to an available or desired amount of resources for coordinated UEs of the serving point; and the serving point adjusts at least one predetermined parameter related to the coordinated UEs based on the shared information so that the amount of resources for the coordinated UEs at the serving point approaches the available or desired amount of resources for the coordinated UEs at the neighbor point. | 08-01-2013 |
20130272246 | COMMUNICATION SYSTEM, BASE STATION, MOBILE STATION, METHOD FOR MOBILE STATION, AND METHOD FOR COMMUNICATION SYSTEM - A device and method in which a plurality of Zadoff-Chu sequences is allocated to a frame, a value of a parameter in the Zadoff-Chu sequence is different among the plurality of Zadoff-Chu sequences, and the Zadoff-Chu sequence allocated to the frame is different among a plurality of cells. | 10-17-2013 |
20140003544 | SINGLE CARRIER TRANSMISSION SYSTEM, COMMUNICATION DEVICE, AND SINGLE CARRIER TRANSMISSION METHOD USING FOR THEM | 01-02-2014 |
20140307709 | SYNCHRONIZATION SYSTEM AND SYNCHRONIZING METHOD FOR PLURALITY OF BASE STATIONS AND MOBILE STATION IN A REVERSE LINK WIRELESS TRANSMISSION - There is provided a wireless communication system which can synchronize a mobile station with a destination base station in response to the mobile station determining to switch base stations. Each base station generates synchronization information to synchronize the mobile station with the base station from a reverse pilot signal received from the mobile station, generates reverse propagation quality information from the reverse pilot signal, and generates and transmits a control signal including the synchronization information and the reverse propagation quality information. A mobile station generates and transmits a reverse pilot signal, receives a signal including the control signal from each of the base stations. | 10-16-2014 |
20150009888 | Radio Communication System and Communication Method - A communication system and method that allows a DeNB to identify a RN registered to another DeNB and to acquire necessary information for coordinating interference from RNs registered to the other DeNB are provided. The communication system includes a plurality of communication nodes which includes a plurality of base stations and a plurality of relay nodes, wherein each relay node has a radio connection with a base station, wherein each base station exchanges information indicating identity of a relay node with another base station. | 01-08-2015 |
20150031284 | RADIO COMMUNICATION SYSTEM AND COMMUNICATION METHOD - A communication system and method that can minimize interference between RN-access links and can maximize the capacity of RNs in the network is provided. The communication system has a plurality of communication nodes which includes a base station and a plurality of relay nodes, wherein the base station controls the relay nodes, each of which can provide a radio connection to at least one terminal via an access link, wherein the base station signals each of the relay nodes to report measurement information related to the access link. | 01-29-2015 |
20150043457 | RADIO COMMUNICATION SYSTEM AND COMMUNICATION CONTROL METHOD - A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception. | 02-12-2015 |
20150049621 | RADIO COMMUNICATION SYSTEM AND METHOD - A radio communication system includes a network and a user terminal, wherein the network includes a plurality of radio stations and a controller which controls the plurality of radio stations, wherein at least two of the plurality of radio stations communicate with the user terminal, wherein the controller notifies the user terminal of information about resource for interference measurement, wherein the user terminal calculates and reports channel quality information based on the information. | 02-19-2015 |
20150050939 | RADIO TERMINAL, RADIO STATION, RADIO COMMUNICATION SYSTEM, AND METHODS IMPLEMENTED THEREIN - In one embodiment, a radio terminal ( | 02-19-2015 |
20150063304 | RADIO COMMUNICATION SYSTEM AND COMMUNICATION METHOD - A base station for supporting a plurality of radio access schemes is provided. The base station includes a radio transceiver, a storage section and a response sending section. The storage section stores at least one radio access scheme supported by the base station. The at least one radio access scheme includes a predetermined radio access scheme which is common with another base station. The response sending section sends a response to an initial connection received from a mobile station back to the mobile station. The initial connection is received in the predetermined radio access scheme. The response includes information indicating one of said at least one radio access scheme which is used to communicate with the mobile station. | 03-05-2015 |