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公开(公告)号：US10833822B2
公开(公告)日：2020-11-10
申请号：US15495308
申请日：2017-04-24
申请人： Yu Cao , Mohammadhadi Baligh , Liqing Zhang
发明人： Yu Cao , Mohammadhadi Baligh , Liqing Zhang
摘要： In a wireless communication system, user equipments (UEs) may be partitioned into different groups, e.g. based on spatial separation. UEs may use multiple access (MA) signatures that have low or no correlation to each other if the UEs are in the same group. The MA signatures used by one group of UEs may be more correlated with the MA signatures used by another group of UEs. If the UEs are partitioned into the different groups based on spatial separation, then the spatial separation between the different groups may assist in increasing the reliability of detection if two UEs in different groups use correlated MA signatures.
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公开(公告)号：US11576199B2
公开(公告)日：2023-02-07
申请号：US17473325
申请日：2021-09-13
申请人： Jianglei Ma , Liqing Zhang , Yu Cao
发明人： Jianglei Ma , Liqing Zhang , Yu Cao
摘要： Systems and methods are disclosed for performing combined grant-free and grant-based UL resource allocation. In a particular embodiment, a network entity sends a first type of UL transmission resource assignment selected from two types of UL transmission resource assignment mechanisms to a UE for grant-free transmission and a second type of UL transmission resource assignment from two types of UL transmission resource assignment mechanism to a UE for grant based transmission. The network entity then receives a first data transmission from the UE for grant free transmission using an assigned transmission resource and a second data transmission from the UE for grant based transmission using an assigned transmission resources. Other embodiments pertain to changing the resource allocation scheme from grant free to grant based for a UE, or vice versa. Examples reasons for doing so may include HARQ re-transmissions.
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3.发明授权公开(公告)号：US11516826B2
公开(公告)日：2022-11-29
申请号：US16544274
申请日：2019-08-19
申请人： Yu Cao , Liqing Zhang , Jianglei Ma
发明人： Yu Cao , Liqing Zhang , Jianglei Ma
摘要： Methods and systems are provided for signaling for semi-static configuration in grant free uplink transmissions. Radio resource control (RRC) signaling is used to provide information from a base station to a user equipment (UE) that configure the grant free transmission resource to be used by the UE. In some implementations, the RRC signaling may be used in conjunction with system information that is transmitted to all UEs and/or Downlink Control Information (DCI) that the UE needs to access subsequent to the RRC signaling. In some implementations, the DCI includes an activation or deactivation indicator that the UE monitors to determine when the UE is allowed to transmit to the BS or should stop transmitting. Implementations allow for grant free transmission resources to be configured on an individual user based and a group basis.
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公开(公告)号：US10813124B2
公开(公告)日：2020-10-20
申请号：US16193365
申请日：2018-11-16
申请人： Yu Cao , Liqing Zhang , Jianglei Ma
发明人： Yu Cao , Liqing Zhang , Jianglei Ma
摘要： There may be situations in which it is beneficial for a user equipment to switch between grant-free uplink wireless transmissions and grant-based uplink wireless transmissions. Systems and methods are disclosed that help facilitate grant-based and grant-free uplink wireless communications, and the switching between the two. For example, systems and methods for mitigating collision between a granted uplink wireless transmission and a grant-free uplink wireless transmission are disclosed herein.
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公开(公告)号：US10651980B2
公开(公告)日：2020-05-12
申请号：US16151920
申请日：2018-10-04
申请人： Yu Cao , Liqing Zhang
发明人： Yu Cao , Liqing Zhang
摘要： Systems and methods are disclosed for performing hybrid automatic repeat request (HARQ) for grant-free uplink transmissions. Some of the systems and methods disclosed herein may address problems such as how to perform acknowledgement (ACK) and/or negative acknowledgement (NACK), how to determine and signal retransmission timing, how to determine the transmission/retransmission attempt and the redundancy version (RV), and/or how to perform the HARQ combining.
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公开(公告)号：US10595336B2
公开(公告)日：2020-03-17
申请号：US15588229
申请日：2017-05-05
申请人： Jianglei Ma , Liqing Zhang , Yu Cao
发明人： Jianglei Ma , Liqing Zhang , Yu Cao
摘要： Systems and methods are disclosed for performing combined grant-free and grant-based UL resource allocation. In a particular embodiment, a network entity sends a first type of UL transmission resource assignment selected from two types of UL transmission resource assignment mechanisms to a UE for grant-free transmission and a second type of UL transmission resource assignment from two types of UL transmission resource assignment mechanism to a UE for grant based transmission. The network entity then receives a first data transmission from the UE for grant free transmission using an assigned transmission resource and a second data transmission from the UE for grant based transmission using an assigned transmission resources. Other embodiments pertain to changing the resource allocation scheme from grant free to grant based for a UE, or vice versa. Examples reasons for doing so may include HARQ re-transmisisons.
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公开(公告)号：US10959261B2
公开(公告)日：2021-03-23
申请号：US15088607
申请日：2016-04-01
申请人： Liqing Zhang , Yu Cao
发明人： Liqing Zhang , Yu Cao
摘要： System and methods are disclosed in which pilots are used to assist in identifying grant-free uplink transmissions originating from the same UE. In one embodiment, a base station receives a grant-free uplink transmission that carries initial data from a user equipment and an initial pilot. The initial pilot is successfully decoded and the initial data is unsuccessfully decoded. The successfully decoded initial pilot and the unsuccessfully decoded initial data are stored in memory. Another grant-free uplink transmission carrying retransmission data from the user equipment and a retransmission pilot is then received. The retransmission pilot is successfully decoded and used to identify the successfully decoded initial pilot in the memory and the unsuccessfully decoded initial data. The retransmission data and the unsuccessfully decoded initial data are used to successfully decode the initial data.
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公开(公告)号：US10779321B2
公开(公告)日：2020-09-15
申请号：US16193365
申请日：2018-11-16
申请人： Yu Cao , Liqing Zhang , Jianglei Ma
发明人： Yu Cao , Liqing Zhang , Jianglei Ma
摘要： There may be situations in which it is beneficial for a user equipment to switch between grant-free uplink wireless transmissions and grant-based uplink wireless transmissions. Systems and methods are disclosed that help facilitate grant-based and grant-free uplink wireless communications, and the switching between the two. For example, systems and methods for mitigating collision between a granted uplink wireless transmission and a grant-free uplink wireless transmission are disclosed herein.
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9.发明授权公开(公告)号：US11546929B2
公开(公告)日：2023-01-03
申请号：US15830928
申请日：2017-12-04
申请人： Yu Cao , Liqing Zhang , Jianglei Ma
发明人： Yu Cao , Liqing Zhang , Jianglei Ma
摘要： Methods and systems are provided for signaling for semi-static configuration in grant free uplink transmissions. Radio resource control (RRC) signaling is used to provide information from a base station to a user equipment (UE) that configure the grant free transmission resource to be used by the UE. In some implementations, the RRC signaling may be used in conjunction with system information that is transmitted to all UEs and/or Downlink Control Information (DCI) that the UE needs to access subsequent to the RRC signaling. In some implementations, the DCI includes an activation or deactivation indicator that the UE monitors to determine when the UE is allowed to transmit to the BS or should stop transmitting. Implementations allow for grant free transmission resources to be configured on an individual user based and a group basis.
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公开(公告)号：US10673593B2
公开(公告)日：2020-06-02
申请号：US15799157
申请日：2017-10-31
申请人： Yu Cao , Liqing Zhang , Jianglei Ma
发明人： Yu Cao , Liqing Zhang , Jianglei Ma
摘要： In a wireless communication system, a grant-free uplink transmission is an uplink transmission sent from a user equipment (UE) to a base station that does not need a dynamic and explicit scheduling grant from the base station. Systems and methods are disclosed for performing hybrid automatic repeat request (HARQ) for grant-free uplink transmissions. Signaling relating to the ACK/NACK for the HARQ, as well as signaling relating to configuring the UE for grant-free uplink transmission, is also disclosed.
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