公开(公告)号：US10104674B2

公开(公告)日：2018-10-16

申请号：US15341846

申请日：2016-11-02

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Lung-Sheng Tsai ,  Yi-Ju Liao ,  Tsang-Wei Yu ,  Pei-Kai Liao

IPC: H04W4/00 ,  H04W72/08 ,  H04L25/02 ,  H04J11/00 ,  H04L1/00 ,  H04B7/0452 ,  H04W88/08 ,  H04W92/10

Abstract: A new air interface that is interference cancellation friendly is proposed. In one novel aspect, a novel code rate assignment with rate splitting is proposed. In one embodiment, a base station decomposes a codeword {x1} into two codewords {x1a} and {x1b}. The two codewords are applied with different code rates and/or modulation orders. More specifically, the code rate or modulation order of codeword {x1a} is set appropriately so that a victim UE can decode and cancel {x1a} under the channel quality of the victim UE. Typically, the channel quality of a victim UE is poorer than the channel quality of the intended UE. As a result, the MCS for {x1a} can be lower than the MCS for {x1b} such that the victim UE is able to apply CWIC to decode and cancel {x1a}.

公开(公告)号：US09973305B2

公开(公告)日：2018-05-15

申请号：US14980867

申请日：2015-12-28

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Yi-Ju Liao ,  Tze-Ping Low ,  Lung-Sheng Tsai

IPC: H04W72/12 ,  H04L1/18 ,  H04W52/26 ,  H04W52/24 ,  H04L1/00 ,  H04W28/06 ,  H04W28/22 ,  H04L5/00 ,  H04L5/14

CPC classification number: H04L1/1812 ,  H04L1/0067 ,  H04L1/1822 ,  H04L1/1845 ,  H04L1/1896 ,  H04L5/001 ,  H04L5/0023 ,  H04L5/0053 ,  H04L5/0069 ,  H04L5/14 ,  H04W28/065 ,  H04W28/22 ,  H04W52/243 ,  H04W52/262 ,  H04W52/267 ,  H04W72/12 ,  H04W72/1252

Abstract: When the codeword level interference cancellation (CW-IC) is used at the receiver in conjunction with the superposition coding scheme at the transmitter, it is helpful if the soft buffer at the receiver is reserved not only for the desired transport blocks (TBs) but also for the interfering TBs handled by the CW-IC. In so doing, the soft channel bits of interfering TBs at multiple (re)transmissions can be combined to enhance the success rate of data decoding. A soft buffer partition method for the soft channel bits of the desired and interfering TBs in the superposition coding scheme is proposed. The proposed method has a full flexibility in adjusting the soft buffer sizes for the desired and interfering TBs.

公开(公告)号：US20170134150A1

公开(公告)日：2017-05-11

申请号：US15341879

申请日：2016-11-02

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Lung-Sheng Tsai ,  Yi-Ju Liao ,  Tsang-We Yu ,  Pei-Kai Liao

IPC: H04L5/14 ,  H04L1/00 ,  H04L5/00 ,  H04W72/04 ,  H04B7/04

CPC classification number: H04L5/14 ,  H04B7/0452 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0041 ,  H04L1/0045 ,  H04L5/0055 ,  H04L5/0057 ,  H04W72/042 ,  H04W72/1231

Abstract: A new air interface that is interference cancellation friendly is proposed. In one novel aspect, addition information is provided between eNB and UE for interference cancellation. From eNB perspective, it provides assistance information to UEs for CWIC. The assistance information may include modulation order and code rate information of the PDSCH for data transmission that may cause interference to other UEs. From UE perspective, it provides feedback information to the eNB for MCS level assignment. The feedback information may include additional channel quality and interference condition information of a data transmission of a desired transport block with respect to the decoding of the desired transport block.

公开(公告)号：US20170048841A1

公开(公告)日：2017-02-16

申请号：US15235745

申请日：2016-08-12

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Yi-Ju Liao ,  Tsang-Wei Yu ,  Lung-Sheng Tsai ,  Pei-Kai Liao

IPC: H04W72/04 ,  H04B7/04 ,  H04L5/00

CPC classification number: H04B7/0452 ,  H04L5/0044 ,  H04L5/0048 ,  H04L27/3488

Abstract: A method of modulating and demodulating superposed signals for MUST scheme is proposed. A transmitter takes bit sequences intended for multiple receivers under MUST scheme to go through a “bit sequence to constellation points” mapper before entering the modulators to satisfy the Gray coding rule and to achieve high demodulation performance for the receivers. In a first method, each bit sequence is assigned for each constellation point on the constellation map to satisfy one or more conditions under different power split factors. In a second method, the constellation map is divided into sub-regions according to the clustering of the constellation points for bit sequence assignment. A near-UE may use an ML receiver for demodulation and decoding the superposed signal. A far-UE may use an ML receiver or an MMSE receiver for demodulation and decoding the superposed signal.

Abstract translation: 提出了一种用于MUST方案调制和解调叠加信号的方法。 发射机采用MUST方案下的多个接收机的比特序列，在进入调制器之前通过“位序列到星座点”映射器，以满足格雷编码规则，并为接收机实现高解调性能。 在第一种方法中，为星座图上的每个星座点分配每个比特序列以满足不同功率分割因子下的一个或多个条件。 在第二种方法中，星座图根据用于比特序列分配的星座点的聚类被划分成子区域。 近UE可以使用ML接收机来对叠加信号进行解调和解码。 远端UE可以使用ML接收机或MMSE接收机对叠加信号进行解调和解码。

公开(公告)号：US20170041906A1

公开(公告)日：2017-02-09

申请号：US15227204

申请日：2016-08-03

Applicant: MEDIATEK INC.

Inventor： Lung-Sheng Tsai ,  Pei-Kai Liao ,  Yi-Ju Liao ,  Chien-Hwa Hwang

IPC: H04W72/04 ,  H04L5/00 ,  H04L1/00

CPC classification number: H04L5/0062 ,  H04L1/0009 ,  H04L5/0037 ,  H04W52/262 ,  H04W52/34 ,  H04W52/346 ,  H04W72/1289

Abstract: Methods of enabling multiuser superposition transmission (MUST) in LTE systems are proposed. MUST operation allows simultaneous transmission for multiple co-channel users on the same time-frequency resources. A higher-layer signaling is used for configuring a UE to enable MUST in each transmission mode (TM). MUST is a sub-TM of each TM. When a UE is configured by higher layer to enable MUST, the UE will monitor new DCI formats supported by the configured TM with new fields carrying scheduling information of another co-channel UE. Dynamic switching between MUST and non-MUST operation is allowed. Mixed transmission schemes and precoders among co-channel UEs are also supported.

Abstract translation: 提出了在LTE系统中实现多用户叠加传输（MUST）的方法。 MUST操作允许在同一时间频率资源上同时传输多个同频道用户。 更高层的信令用于配置UE以在每个传输模式（TM）中启用MUST。 必须是每个TM的子TM。 当UE由更高级配置以启用MUST时，UE将监视由配置的TM支持的新的DCI格式，新的字段携带另一个同频道UE的调度信息。 允许在MUST和非MUST操作之间进行动态切换。 同时支持混合传输方案和预编码器。

公开(公告)号：US20160191225A1

公开(公告)日：2016-06-30

申请号：US14980750

申请日：2015-12-28

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Lung-Sheng Tsai ,  Yi-Ju Liao ,  Tze-Ping Low

IPC: H04L5/00 ,  H04L1/18 ,  H04W72/04 ,  H04W52/26 ,  H04W52/24

CPC classification number: H04L1/1812 ,  H04L1/0067 ,  H04L1/1822 ,  H04L1/1845 ,  H04L1/1896 ,  H04L5/001 ,  H04L5/0023 ,  H04L5/0053 ,  H04L5/0069 ,  H04L5/14 ,  H04W28/065 ,  H04W28/22 ,  H04W52/243 ,  H04W52/262 ,  H04W52/267 ,  H04W72/12 ,  H04W72/1252

Abstract: Methods for rate matching with soft buffer size setting at the transmitter and soft channel bits storage at the receiver for superposition coding are proposed. In the superposition coding scheme, a transport block intended to one UE needs to be decoded by another UE's receiver. However, the soft buffer sizes per code block of the two receivers may not be the same since the size depends on the UE category. The base station can signal the soft buffer size used at the transmitter for rate matching to the UEs for superposition decoding. A UE stores information bits associated with an interfering signal in its soft buffers in accordance with the soft buffer size used at the transmitter for rate matching. As a result, the UE can decode and subtract the interfering signal from the desired signal for superposition coding.

Abstract translation: 提出了在发射机处的软缓冲器大小设置的速率匹配方法和用于叠加编码的接收机处的软信道比特存储的方法。 在叠加编码方案中，用于一个UE的传输块需要被另一个UE的接收机解码。 然而，两个接收机的每个码块的软缓冲器大小可能不相同，因为该大小取决于UE类别。 基站可以将发送器使用的软缓冲区大小信号发送给UE进行叠加解码。 UE根据用于速率匹配的发送器使用的软缓冲器大小，将与干扰信号相关联的信息位存储在其软缓冲器中。 结果，UE可以从用于叠加编码的期望信号中解码和减去干扰信号。

公开(公告)号：US20160191175A1

公开(公告)日：2016-06-30

申请号：US14981154

申请日：2015-12-28

Applicant: MEDIATEK INC.

Inventor： Chien-Hwa Hwang ,  Tze-Ping Low ,  Lung-Sheng Tsai ,  Yi-Ju Liao

IPC: H04B15/00 ,  H04W72/04

CPC classification number: H04B15/00 ,  H04L1/0041 ,  H04L1/0048 ,  H04L1/1812 ,  H04L1/1822 ,  H04L5/00 ,  H04L5/0037 ,  H04L5/0044 ,  H04W72/044

Abstract: When the codeword level interference cancellation (CW-IC) is used at the receiver in conjunction with the superposition coding scheme at the transmitter, in order to guarantee the success of signal reception, restrictions of scheduling decisions in resource allocation of superposed transport blocks may occur. A method to mitigate the scheduling restrictions is proposed. For a low-geometry UE in NOMA operation, one sub-band is used as the basic scheduling unit. As a result, data in resource blocks scheduled for NOMA operation and data in resource blocks scheduled for other non-NOMA operation correspond to different transport blocks. Therefore, a high-geometric UE only needs to decode the data scheduled for NOMA. The base station does not need to impose additional scheduling restrictions and signaling overhead.

Abstract translation: 当在发射机处结合重叠编码方案在接收机处使用码字电平干扰消除（CW-IC）时，为了保证信号接收成功，可能发生重叠传输块的资源分配中的调度决策的限制 。 提出了一种减轻调度限制的方法。 对于NOMA操作中的低几何UE，使用一个子带作为基本调度单元。 结果，为NOMA操作调度的资源块中的数据和为其他非NOMA操作调度的资源块中的数据对应于不同的传输块。 因此，高几何UE仅需要解码为NOMA调度的数据。 基站不需要强加额外的调度限制和信令开销。