Patent application number | Description | Published |
20080198800 | Method and Apparatus for Enhanced Uplink Data Transmission - The present invention provides a method and apparatus used for enhanced uplink data transmission, comprising the steps of: monitoring the communication status of a plurality of UEs (user equipment) which conduct uplink data transmission in the RAN; receiving the data transmitted on at least one dedicated uplink channel from at least one of the plurality of UEs; according to the communication status of the plurality of UEs, dynamically allocating the number of dedicated uplink channels for at least one UE of the plurality of UEs. Utilization of the present invention can enable mobile terminal to conduct more efficient uplink transmission. | 08-21-2008 |
20080247337 | Method and Apparatus for Joint Detection in Downlink Tdd Cdma - A method and apparatus for implementing downlink JD (Joint Detection) in TDD CDMA communication systems, wherein the steps to be executed in the UE comprises: receiving downlink signals from a network system in a specific timeslot; acquiring the active primary and secondary channelisation codes in the specific timeslot, through processing the downlink signal; acquiring the initial ACC (Active Channelisation Codes) information for use in implementing JD in the next frame, through implementing a JD algorithm on the downlink signal by using the primary and secondary channelisation codes. An ACC dedicated channel is sent on the FPACH, carrying information relative to the use of secondary channelisation codes. | 10-09-2008 |
20090067424 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING A DATA BLOCK IN A WIRELESS COMMUNICATION SYSTEM - The invention provides methods and apparatus for transmitting and receiving a source data block in a wireless communication system using hybrid automatic retransmission request protocol. According to the scheme provided by the invention, at transmitting side, the source data block or part of source data block that is not decoded correctly at receiving side is divided into a plurality of data segments, each the plurality of data segments may be paded with known data to expand the data segments to be a predetermined lengthen, the data segment is encoded with linear code to be a data packet including the data segment and a redundancy information segment or including only redundancy information, and after that the encoded data packets are transmitted. At the receiving side, when each of the received data packets includes a data segment and a redundancy information segment, decoding is performed directly based on the received data packet, decoding is performed based on the received redundancy information segment and an data segment and redundancy information segment extracted from buffered data packets with a first and second chance to restore the data segment that is not decoded correctly in previous decoding processing. With the additional decoding chance, the scheme provided by the invention can improve decoding probability and thus the transmission efficiency of the system. | 03-12-2009 |
20090252245 | TRANSMISSION METHOD AND APPARATUS FOR CANCELLING INTER-CARRIER INTERFERENCE - The present invention provides a transmission method and apparatus for cancelling inter-carrier interference in wireless communication systems. Particular carriers are not used for data transmission but carry weighted data to cancel the ici interference of a first group of interfering sub-carriers onto a second group of victim sub-carriers. The weights are inversely proportional to the frequency offset between the interfering sub-carriers and the victim sub-carriers. | 10-08-2009 |
20090310687 | METHOD AND APPARATUS FOR SPACE-TIME-FREQUENCY ENCODING AND DECODING - The present invention provides a space-time-frequency encoding and decoding method and apparatus used in a wireless communication system. With the encoding method provided in the invention, transmission code words and their redundant elements are properly allocated on space-time-frequency units, so that the transmission codes and their partial redundancies can be transmitted via different antennas. Accordingly, at the receiving side, the redundant elements and the corresponding code word elements can be combined, so as to enhance the SNR and diversity gains for a part of the elements in the code words, and hence enhance the reception quality for the overall data stream. | 12-17-2009 |
20100074218 | METHOD AND APPARATUS FOR PILOT CAPTURE FOR WIRELESS INTERSYSTEM HANDOVER - The present invention provides a method and apparatus applied to pilot capture for handover between wireless communication networks. In the method, when a mobile station needs to hand over from a GSM system serving as current service network to another wireless communication network, the GSM system and the mobile station will update the logic location of the first idle frame to be met subsequently, which will be inserted after the TDMA frame where the corresponding starting point of pilot capture resides, then the mobile station utilizes idle timeslots after the starting point to form a pilot capture time window with a predefined length, eventually the mobile station captures the pilot signal of the another wireless communication network in the pilot capture time window. Comparing to conventional pilot capture method, with the method provided by the present invention, the mobile station not only capture the complete pilot signal of target handover network, but also achieve the whole pilot-capture process with relatively short time. | 03-25-2010 |
20100146354 | METHOD AND APPARATUS FOR H-ARQ IN A WIRELESS COMMUNICATION SYSTEM - The present invention discloses an H-ARQ scheme: In the case of wireless channel is in good condition, user equipment will send NACK signals and other control information only when it has received an incorrect data packet, otherwise the user equipment will not send ACK signals; in the case of wireless channel is in bad condition, existing H-ARQ schemes will be adopted. | 06-10-2010 |
20100177741 | METHOD FOR RESOURCE UNIT ALLOCATION FOR WIRELESS COMMUNICIATION, SUBSCRIBER STATION AND BASE STATION - A method for wireless communication between a base station and a plurality of subscriber stations is described wherein a communication capacity is partitioned in resource units at least by code multiplexing, which resource units are distributed by the base station over said devices, wherein data from each subscriber station is spread by means of a signature sequence, characterized in that multiple resource units assigned to a common subscriber station have the same signature sequence. | 07-15-2010 |
20100195514 | METHOD AND SYSTEM FOR OPERATING A MULTI-USER MULTIPLE-INPUT MULTIPLE OUTPUT (MU-MIMO) WIRELESS COMMUNICATIONS SYSTEM - A technique for operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations involves generating inter-cell interference information at the mobile stations and providing the inter-cell interference information to the base station. The base station uses the inter-cell interference information to calculate channel quality indicators (CQIs) and then makes scheduling decisions in response to the CQIs. Data is transmitted from the base station to the mobile stations according to the scheduling decisions. | 08-05-2010 |
20100254473 | METHOD AND SYSTEM FOR MANAGING PRECODING IN A MULTI-USER WIRELESS COMMUNICATIONS SYSTEM - Operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations involves generating a channel estimation, predicting a future channel estimation from the channel estimation, precoding data in response to the predicted future channel estimation, and transmitting the precoded data. | 10-07-2010 |
20100284353 | METHOD AND SYSTEM FOR MANAGING TRANSMISSION RESOURCES IN A WIRELESS COMMUNICATIONS SYSTEM - A technique for managing the transmission resources in a wireless communications system ( | 11-11-2010 |
20100311428 | RANDOM ACCESS PREAMBLE CELLULAR PHONE SYSTEMS WITH MULTIPLE ZADOFF-CHU SEQUENCES - A cellular phone system where a random access channel burst has a preamble comprising two Zadoff-Chu sequences to mitigate the effects of Doppler Frequency Offset. Upon reception of a random access channel burst by a base station, division is applied to the two sequences recovered from the preamble of the received burst to provide a quotient sequence. For some embodiments, the base station correlates the quotient sequence with a Zadoff- Chu sequence to identify the user equipment that transmitted the random access channel burst. Other embodiments are described and claimed. | 12-09-2010 |
20110135018 | RADIO CHANNEL MODEL FOR ICI CANCELLATION IN MULTI-CARRIER SYSTEMS - A channel modeling method for Inter Carrier Interference (ICI) cancellation in multi-carrier wireless communication systems comprises: describing the channel with a plurality of fixed matrices and an equal-numbered plurality of unfixed variables; one-to-one pairing each of the described plurality of unfixed variables with one of described plurality of fixed matrices. Corresponding system is also provided. The method and system can compensate for the channel distortion of the Doppler Effect even if the Doppler Frequency Offset is relatively significant. | 06-09-2011 |
20110135019 | SIMPLIFIED EQUALIZATION SCHEME FOR DISTRIBUTED RESOURCE ALLOCATION IN MULTI-CARRIER SYSTEMS - In multi-carrier systems, distributed resource allocation of the resources of multiple user equipments (UEs) can result in better frequency diversity gain but can also induce Inter-Carrier Interference (ICI) between UEs. This ICI can become quite serious in a high mobility environment. Based on a novel radio channel model for ICI cancellation in multi-carrier systems and an iterative channel estimation scheme for ICI cancellation in multi-carrier systems, the present invention provides a simplified equalization scheme in the frequency domain to determine and remove ICI of both a targeting UE as well as other UEs. | 06-09-2011 |
20110142151 | AN ADAPTIVE SCHEME TO DETERMINE THE SUB-CARRIER SPACING FOR MULTI-CARRIER SYSTEMS - Orthogonal Frequency Division Multiplexing (OFDM) is a typical multi-carrier technique that has been applied by many advanced wireless communication systems, e.g., 3GPP Long Term Evolution (LTE) and WiMAX. In order to support high mobility transmission, the sub-carrier spacing of multi-carrier systems is made large enough to overcome the Doppler frequency offset. However, this large sub-carrier spacing results in lower transmission efficiency since the CP (Cyclic Prefix) consumes a considerable of radio resources. The present invention provides an adaptive scheme to determine the sub-carrier spacing in which the default sub-carrier spacing is set to support lower mobility, while the adaptively adjusted sub-carrier spacing based on User Equipment (UE) mobile velocities is set to support higher mobility. | 06-16-2011 |
20110211485 | METHOD AND SYSTEM FOR OPERATING A MULTI-USER MULTIPLE-INPUT MULTIPLE OUTPUT (MU-MIMO) WIRELESS COMMUNICATIONS SYSTEM - A technique for operating a wireless communications system that supports multi-user multiple-input multiple-output (MU-MIMO) communications between a base station and multiple mobile stations involves generating inter-cell interference information at the mobile stations and providing the inter-cell interference information to the base station. The base station uses the inter-cell interference information to calculate channel quality indicators (CQIs) and then makes scheduling decisions in response to the CQIs. Data is transmitted from the base station to the mobile stations according to the scheduling decisions. | 09-01-2011 |
20120014465 | ITERATIVE CHANNEL ESTIMATION METHOD AND APPARATUS FOR ICI CANCELLATION IN MULTI-CARRIER - A linear iterative channel estimation scheme and corresponding pilot allocation scheme are provided to perfect a channel model that cancels the Inter-Carrier Interference (ICI) for multi-carrier systems (e.g., OFDM, SC-FDMA, MC-CDMA, etc.) under high mobility conditions. Two issues of the linear iterative channel estimation scheme of the channel model, namely, overloaded pilots and increased Gauss noise are specifically addressed by exemplary embodiments. With the iterative channel estimation scheme provided by the present invention, the minimum pilot number is equal to the length of multi-path delay, and the Gauss noise is not increased. | 01-19-2012 |
20120230282 | BASE STATION, NETWORK SYSTEM, AND IMPLEMENTATION METHOD - A base station includes multiple edge nodes and a central node. The edge nodes are configured to perform communication with a user equipment, and execute baseband processing and mutual conversion between baseband data and radio data, in which the multiple edge nodes belong to one or more edge node groups, and each edge node group includes at least one edge node. The central node is configured to perform communication with the multiple edge nodes, manage the multiple edge nodes, and perform resource sharing so that resources are shared by the multiple edge nodes. The base station is divided into two levels of architecture, namely, a central node and an edge node, and the central node implements resource sharing so that resources are shared by the edge nodes, so that a resource sharing degree in the base station is enhanced. | 09-13-2012 |
20130182750 | METHOD AND APPARATUS FOR TRANSMITTING DATA USING CODEBOOK - The present invention provides a method and an apparatus for transmitting data using a codebook. The method includes: receiving current antenna configuration information of a transmitting end; obtaining a mask matrix corresponding to the current antenna configuration according to the current antenna configuration information; generating a codebook corresponding to the current antenna configuration according to a mother codebook and the mask matrix; selecting one codebook element from the codebook, and transmitting indication information corresponding to the codebook element to the transmitting end; and receiving data transmitted by the transmitting end. In the embodiments of the present invention, a mask matrix is obtained according to current antenna configuration information, and a codebook is generated according to the mask matrix and a mother codebook that is corresponding to the maximum number of antennas and the maximum number of layers that are fed back through channel state information. | 07-18-2013 |
20130273854 | COMMUNICATION METHOD, APPARATUS, AND SYSTEM FOR DISTRIBUTED ANTENNA SYSTEM - Embodiments of the present invention provide a communication method, an apparatus, and a system for a distributed antenna system, and relate to the field of communications technologies. The communication method includes: receiving, by a receiving device, a measurement reference signal corresponding to an antenna cluster in a cell, where all antennas in the cell are divided into at least one antenna cluster, and each antenna cluster includes at least one antenna and has a corresponding cluster identifier; obtaining channel information corresponding to the antenna cluster according to the measurement reference signal; and transmitting the cluster identifier and the channel information corresponding to the antenna cluster to a central processing device, so that the central processing device determines the antenna cluster serving the receiving device according to the cluster identifier and the channel information corresponding to the antenna cluster. | 10-17-2013 |
20130308587 | TRANSMISSION METHOD AND APPARATUS FOR CANCELLING INTER-CARRIER INTERFERENCE - The present invention provides a transmission method and apparatus for cancelling inter-carrier interference in wireless communication systems. Particular carriers are not used for data transmission but carry weighted data to cancel the ici interference of a first group of interfering sub-carriers onto a second group of victim sub-carriers. The weights are inversely proportional to the frequency offset between the interfering sub-carriers and the victim sub-carriers. | 11-21-2013 |
20140079007 | DATA STREAM TRANSMISSION METHOD AND RELATED DEVICE AND SYSTEM - Embodiments of the present disclosure relate to the field of communications technologies, and disclose a data stream transmission method, and a related device and system. The data stream transmission method includes: a user equipment establishes a first network link over a first network and a second network link over a second network with a network side, where the first network is different from the second network; the user equipment associates the first network link with the second network link; and the user equipment distributes, according a scheduling algorithm, a data stream to the first network link and to the second network link for transmission. In the embodiments of the present disclosure, hybrid transmission of a data stream may be implemented in different networks. Compared with an existing solution, in the embodiments of the present disclosure, distribution may be performed more flexibly, and a quality of service assurance may be improved. | 03-20-2014 |
20140086148 | METHOD AND BASE STATION FOR COORDINATING CELL INTERFERENCE - Embodiments of the present invention disclose a method and a base station for coordinating cell interference. The method includes: receiving each backhaul signal transmitted by each cooperative base station, where the backhaul signal is determined by the cooperative base station according to strength of a signal received from a served user and strength of a signal received by a serving base station from an interfering user in the cooperative base station; and combining, at different stages of baseband processing and according to a type of each backhaul signal, a backhaul signal of a corresponding type and a user signal received from each user. An embodiment of the present invention further provides a base station. According to the embodiments of the present invention, backhaul transmission capacity is maximally utilized, backhaul transmission efficiency is improved, and relatively high performance is obtained. | 03-27-2014 |
20140098901 | METHOD AND APPARATUS FOR TRANSMITTING DATA USING CODEBOOK - A method and an apparatus for transmitting data using a codebook include receiving current antenna configuration information of a transmitting end, obtaining a mask matrix corresponding to the current antenna configuration according to the current antenna configuration information. The method also includes generating a codebook corresponding to the current antenna configuration according to a mother codebook and the mask matrix and selecting one codebook element from the codebook. Indication information corresponding to the codebook element is transmitted to the transmitting end and receiving data is transmitted by the transmitting end. | 04-10-2014 |
20140348110 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION - A method and an apparatus for transmitting control information are disclosed. The method includes: grouping UEs in a cell, and obtaining second control information of each UE group after grouping; performing joint channel coding on the second control information of each UE group; obtaining first control information, and transmitting the first control information to the UEs in the cell, where the first control information includes indication information of the second control information, on which joint channel coding has been performed, of each UE group, so as to obtain the second control information according to the indication information; and transmitting the second control information, on which joint channel coding has been performed, of each UE group to the UEs in the cell. | 11-27-2014 |