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21.发明申请公开(公告)号：US20220217714A1
公开(公告)日：2022-07-07
申请号：US17143379
申请日：2021-01-07
Inventor： Yaming Luo , Yunxiang Yao , Man Wai Kwan , Xiangyu Liu , Ying Lun Tsui , Kong Chau Tsang
Abstract: Described is a method of processing a signal received at an uplink control information (UCI) receiver in a wireless communication system. The method comprises processing a signal received on an uplink (UL) at said UCI receiver to transform said received signal into a likelihood calculation of possible transmitted codewords (θ1 . . . θi . . . θN) and determining a maximum magnitude θmax value from said likelihood calculation. The method includes comparing said maximum magnitude θmax value to a selected, calculated or predetermined scaled threshold S·τ where τ is a threshold and S is a scaling factor for the threshold τ. The comparison step is such that, where |θmax|2>S·τ, the method comprises determining that the signal received comprises a linear block encoded signal. In the method, prior to said comparison step, the scaling factor S is selected from a plurality of scaling factor options. One scaling factor option (i) is a scaling factor SRE derived from a combination of estimated noise and/or signal power at an output of a resource element (RE) demapper module and an estimated channel response from/before an equalizer module of said UCI receiver. The options also include using a combination of SRE and a suitable scaling factor derived excluding option (i).
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22.发明授权公开(公告)号：US11375486B1
公开(公告)日：2022-06-28
申请号：US17143379
申请日：2021-01-07
Inventor： Yaming Luo , Yunxiang Yao , Man Wai Kwan , Xiangyu Liu , Ying Lun Tsui , Kong Chau Tsang
Abstract: Described is a method of processing a signal received at an uplink control information (UCI) receiver in a wireless communication system. The method comprises processing a signal received on an uplink (UL) at said UCI receiver to transform said received signal into a likelihood calculation of possible transmitted codewords (θ1 . . . θi . . . θN) and determining a maximum magnitude θmax value from said likelihood calculation. The method includes comparing said maximum magnitude θmax value to a selected, calculated or predetermined scaled threshold S·τ where τ is a threshold and S is a scaling factor for the threshold τ. The comparison step is such that, where |θmax|2>S·τ, the method comprises determining that the signal received comprises a linear block encoded signal. In the method, prior to said comparison step, the scaling factor S is selected from a plurality of scaling factor options. One scaling factor option (i) is a scaling factor SRE derived from a combination of estimated noise and/or signal power at an output of a resource element (RE) demapper module and an estimated channel response from/before an equalizer module of said UCI receiver. The options also include using a combination of SRE and a suitable scaling factor derived excluding option (i).
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Patent Agency Ranking
公开(公告)号：US11284405B2
公开(公告)日：2022-03-22
申请号：US16364335
申请日：2019-03-26
Inventor： Zizhou Wang , Qifeng Liao , Jihui Zhang , Man Wai Kwan , Kong Chau Tsang
IPC: H04W72/08 , H04L5/00 , H04J11/00 , H04B17/382 , H04B17/327 , H04W72/10
Abstract: Described is a method of reducing uplink inter-cell interference in a cellular communications network. The method comprises identifying in a cell any user equipments (UEs) which are susceptible to interference (ISUs) from another UE, particularly another UE in a neighboring cell. The method includes identifying in said cell any UEs causing interference (ICUs) to at least one neighboring cell and, more particularly, causing interference to a UE in a neighboring cell. The identified ISUs and ICUs are combined into a priority list for frequency resource reservation or allocation in said cell. The method may include limiting the identification of ISUs and ICUs to a selected number of UEs within the cell.
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公开(公告)号：US10448432B1
公开(公告)日：2019-10-15
申请号：US16005306
申请日：2018-06-11
Inventor： Yijing Chu , Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
Abstract: Systems and methods which provide for detection of a signal using resource elements in the frequency domain where the signal for which detection is provided is multiplexed with other signals having subcarrier spacing that is different than the signal for which detection is provided are disclosed. Embodiments may provide for detection of a physical random access channel (PRACH) signal in a cellular radio communication system using resource elements in the frequency domain, wherein the PRACH signal is multiplexed with signals of other channels (e.g., data and/or control channel signals) of the cellular radio communication system. A frequency domain filter, such as implementing inverse discrete Fourier transform (IDFT) with down-sampling using indices for PRACH recovery, may be utilized to extract PRACH samples from frequency domain resource elements provided in a resource grid corresponding to a different subcarrier spacing than that of the PRACH.
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公开(公告)号：US10334516B1
公开(公告)日：2019-06-25
申请号：US15920026
申请日：2018-03-13
Inventor： Zhonghui Zhang , Xiangyu Liu , Yuxian Zhang , Man Wai Kwan , Kong Chau Tsang
IPC: H04W48/16 , H04B17/318 , H04W56/00
Abstract: The present disclosure relates to methods, devices, and systems for cell identification. For example, the systems, devices, and methods described herein may be used to detecting a secondary synchronization signal (SSS) index. In an aspect of the present disclosure, a method includes detecting, at an electronic device, a first SSS index based on a comparison between a first power value and a first threshold. The first power value is associated with a correlation power result between a received signal from a base station and a local SSS. The method also include determining, at the electronic device, a second threshold based on the first power value, and performing a comparison between a second power value and the second threshold. The second power value is determined based on the received signal.
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26.发明授权公开(公告)号：US10277296B2
公开(公告)日：2019-04-30
申请号：US15434115
申请日：2017-02-16
Inventor： Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
Abstract: Provided is a method of base station (BS) for channel state information (CSI) acquisition in a massive multiple input/multiple output (MIMO) communication system. The method comprises the steps at the BS of sending a set of beamformed reference signals (RSs) to a user equipment (UE) and receiving from said UE an indication of a subset of said set of beamformed RSs and CSI acquired by said UE for only said subset of said set of beamformed RSs. Also provided is a further method and a user equipment (UE) for CSI acquisition. The further method comprises the steps at the UE of receiving from the BS the set of beamformed RSs; estimating a channel of each RS comprising said set of beamformed RSs; selecting a subset of said set of beamformed RSs; acquiring CSI for only said selected subset of said set of beamformed RSs; and communicating to said BS an indication of said selected subset of said set of beamformed RSs and reporting the CSI acquired for said selected subset of said set of beamformed RSs.
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公开(公告)号：US20180359043A1
公开(公告)日：2018-12-13
申请号：US15616002
申请日：2017-06-07
Inventor： Ho Yin Chan , Chang Li , Man Wai Kwan , Yuxian Zhang , Kong Chau Tsang
CPC classification number: H04J11/0036 , H04L25/0204 , H04L25/0212
Abstract: Provided is a method of determining timing of arrival of a signal on a path to a receiver in a mobile wireless communications system. The method comprises obtaining a channel impulse response (CIR) of a signal received at the receiver and deriving a power characteristic of the CIR. The method includes producing a first derivative of the power characteristic with respect to time, selecting some or all extrema from the first derivative of the power characteristic as indicative of candidate signal paths, and selecting one or more of said candidate signal paths. The method preferably includes determining timing of arrival of a signal on a first path of arrival at the receiver by assessing an energy value of each of said candidate signal paths against a threshold value.
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