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公开(公告)号：WO2009092184A1
公开(公告)日：2009-07-30
申请号：PCT/CN2008/002011
申请日：2008-12-15
Applicant: 联想(北京)有限公司 , 刘云辉 , 罗琳佳 , 张孝林
IPC: H04B7/00
CPC classification number: H04W52/346
Abstract: A user scheduling method and device for time division duplex multiple-input multiple-output downlink transmitting system. The method includes: the step of obtaining gain, obtaining the effective gain of each of at least two usable sub-channels, according to the channel gain of at least two usable sub-channels of active user and the correlative coefficient between at least two usable sub-channels; the step of obtaining a preferred service sub-channel, selecting a usable sub-channel from at least two usable sub-channels as the preferred service sub-channel according to the effective gain; the step of obtaining a subordinate service sub-channel, recalculating the effective gain according to the correlative coefficient between the remainder usable sub-channel and fresh selecting service sub-channel, and selecting the subordinate service sub-channel according to the recalculated effective gain.
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公开(公告)号：WO2008098442A1
公开(公告)日：2008-08-21
申请号：PCT/CN2007/003148
申请日：2007-11-06
Applicant: 北京联想软件有限公司 , 联想(北京)有限公司 , 刘云辉 , 张孝林
IPC: H04B7/06
CPC classification number: H04W52/42 , H04B7/0417 , H04B7/0626 , H04B7/0639 , H04L1/0003 , H04L1/0009 , H04L1/0019 , H04L1/0025 , H04L1/06
Abstract: A control method and control means for rate and power of subchannel per space are disclosed. The method includes: the receiver determines selected modulation and coding mode for every space subchannel based on channel status information on receiver side; the receiver informs the transmitter about the selected modulation and coding mode in the form of index; the transmitter performs pre-coding based on the statistic value of channel status information and modulation and coding mode of subchannel. Because the present invention only feedbacks the index, and does not need to feedback channel status information in real time, bandwidth requirementof feedback information is reduced. And present invention uses statistic information of channel status information, such as mean, variance or related matrix parameter, to pre-code, therefore, sensitivity of the pre-coding system performance to channel status information error is reduced.
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公开(公告)号：WO2007131454A1
公开(公告)日：2007-11-22
申请号：PCT/CN2007/001602
申请日：2007-05-17
Applicant: 联想(北京)有限公司 , 张孝林 , 刘云辉
Abstract: A method for detecting other wireless system is suited for communication device comprising both time division duplex system and other wireless system. And the communication device is carrying out the service of the TDD system. The method presets the upstream data transmission time slot for detecting other wireless system in the TDD wireless sub frame. And the method further comprises: when the upstream data transmission time slot for detecting other wireless system in the TDD wireless sub frame arrives, other wireless system is searched in the time slot and if found, the relative information of other wireless system is received and recorded,and then returning to continue the present TDD service, otherwise, directly returning to continue the present TDD service. A communication device capable of detecting other wireless system is also disclosed. The solution doesn't need to interrupt the proceeding TDD service and add special detecting module and doesn't add the additional hardware complexity.
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公开(公告)号：WO2009046626A1
公开(公告)日：2009-04-16
申请号：PCT/CN2008/001666
申请日：2008-09-27
Applicant: 联想(北京)有限公司 , 刘云辉 , 张孝林 , 李翔
CPC classification number: H04L25/0224 , H04L25/0242 , H04L25/03343
Abstract: A determining method for downlink channel state information in a TDD system is provided to solve the problem that the downlink channel is not determined accurately currently. The method includes: estimating the uplink channel information according to the pilots; calculating the transient channel state information Hf; estimating the downlink channel information He according to long-term channel statistic character; determining a weighting factor a between Hf and He; determining the downlink channel state information Hd according to He, a and Hf. An apparatus implementing the determining method and a precoding method and apparatus applying the determining method and apparatus are also provided. The present invention decreases the performance deterioration of precoding brought by the fact that channel reciprocal condition is destroyed and improves the stability of downlink transmitting system.
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Patent Agency Ranking
公开(公告)号：WO2009046627A1
公开(公告)日：2009-04-16
申请号：PCT/CN2008/001669
申请日：2008-09-27
Applicant: 联想(北京)有限公司 , 颜罡 , 张孝林
CPC classification number: H04L25/03343 , H03F1/3247 , H03F1/3252 , H03F1/3282 , H03F2201/3233 , H04L27/2626 , H04L2025/03414 , H04L2025/0342 , H04L2025/03426
Abstract: The invention provides a method and pre-distortion unit for correcting signals in radio frequency links. The method includes that of: based on the difference in arrival time of circular delay frames in each radio frequency link of a multiple input multiple output system, obtaining a set of pre-distortion vectors of each radio frequency link according to a time division order by using the same set of pre-distortion vector obtaining units; and correcting the subsequent signals of each radio frequency link by using the set of pre-distortion vectors. The invention can generate an error vector table in the whole dynamic power range of input signals by performing only one scan to the head of a frame, the device can be used repeatedly by using circular delay frame structure, and the high linearity in radio frequency front end is realized.
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公开(公告)号：WO2009009962A1
公开(公告)日：2009-01-22
申请号：PCT/CN2008/001326
申请日：2008-07-16
Applicant: 联想(北京)有限公司 , 刘云辉 , 张孝林 , 李颖
IPC: H04B7/04
Abstract: A method for achieving multi-user fair scheduling and pre-encoding is disclosed,including:A.the base station acquires the channel state of each active user, and uses it to calculate the maximal spatial sub-channel gain of each active user;B.using all of the maximal spatial sub-channel gains to calculate the average gain of all the active users,and consequently, calculating the discretenesses between each active user and the average gain;C. calculating the channel relativities of every two users in a rising order of the discretenesses, and selecting a user to provide service based on a preset rule. A device for achieving multi-user fair scheduling and pre-encoding is also disclosed. Advantages of the invention:achieving a better tradeoff between fair scheduling and system capacity,meanwhile, depressing the complexity of implementation.
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公开(公告)号：WO2008043270A1
公开(公告)日：2008-04-17
申请号：PCT/CN2007/002862
申请日：2007-09-29
IPC: H04L12/16
CPC classification number: H04L12/12 , H04L63/10 , H04W12/08 , H04W52/0235 , Y02D70/1224
Abstract: A remote wake up system based on a WWAN module, a WWAN module and a terminal are provided. The system includes: a terminal; a WWAN module for receiving and/or sending information in a wireless manner; and a security control module for performing a security validation on the call information received by the WWAN module when the terminal is in a sleep state, and the security control module generating a wake-up signal and sending the wake-up signal to the terminal in order to wake up it, in the case of passing the security validation.
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公开(公告)号：WO2009015562A1
公开(公告)日：2009-02-05
申请号：PCT/CN2008/001411
申请日：2008-08-01
Applicant: 联想(北京)有限公司 , 任俊 , 李翔 , 彭清 , 张孝林
IPC: H04B7/06
CPC classification number: H04B7/0697 , H04B7/0613
Abstract: A method for determining to use diversity or multiplexing transmission based on channel quality indication includes the steps of: obtaining channel quality indication CQI values fed back by an user terminal within continuous N transmission times intervals before the current time, and calculating the average values M and standard deviations S of the obtained CQI values (302); establishing a sequential corresponding relation between the [M-S, M+S] set and the set SNR range (303); determining SNRs corresponding to the current CQI value according to the corresponding relation (304), wherein, the CQI values less than M-S are set to M-S, and the CQI values larger than M+S are set to M+S; calculating diversity and/or multiplexing gains according to the determined SNRs, so as to determine to use diversity or multiplexing to transmit the downlink data (305). A device is used to realize the method.
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公开(公告)号：WO2007147337A1
公开(公告)日：2007-12-27
申请号：PCT/CN2007/001868
申请日：2007-06-13
Applicant: 联想(北京)有限公司 , 张孝林 , 张学军
IPC: H04Q7/32
CPC classification number: H04W52/0248 , H04W8/005 , H04W88/06 , Y02D70/122
Abstract: A dual-mode wireless terminal with two kinds of communication modes is provided, and a method for performing two kinds of communication modes simultaneously is also provided. In said two kinds of communication modes, the first communication mode and the second communication mode are both in standby state. The method includes: powering off the transmitter in the second communication mode, when the first communication mode entering communication state; and powering on the transmitter in the second communication mode, when the first communication mode terminating communication. The method further includes: powering off the network searching function of the first communication mode, when the second communication mode entering communication state; and powering on the network searching function of the first communication mode, when the second communication mode terminating communication. The dual-mode wireless terminal of present invention and the method thereof eliminate the radio frequency interference which imposed by one kind of communication mode to another kind of communication mode, when performing two kinds of communication modes simultaneously.
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