Patent Publication Number: US-2016242165-A1

Title: Apparatuses for transmitting uplink control information

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of priority to U.S. Provisional Application Ser. No. 61/806,946, filed on Apr. 1, 2013; the entirety of which is incorporated herein by reference for all purposes. 
    
    
     BACKGROUND 
     The disclosure generally relates to a communication system and, more particularly, to transmissions of uplink control information in a communication system. 
     In the mobile communication system, the user equipment (UE) needs to report multiple types of information to the base stations for enhancing the communication quality. For example, in the 3rd Generation Partnership Project (3GPP) specification, the UE may report, the sounding reference signal (SRS) and several types of uplink control information (UCI), e.g., the channel status information (CSI) and the scheduling request (SR). 
     Other techniques are also utilized in the advanced communication standards for further improving the communication performance. For example, by utilizing the traffic adaptation mechanism, the base station may utilize the data frame with a suitable uplink-downlink (UL-DL) configuration for flexibly adjusting the subframes used for uplink and downlink services. 
     For a time division duplexing (TDD) communication system, the UL-DL configuration of the legacy UE may be changed according to the system information transmitted by the base station, e.g., the System Information Block Type 1 (SIB1) transmitted by the evolved NB (eNB) in 3GPP long-term evolution (LTE) system. In the 3GPP LTE system, the minimum period of transmitting the SIB1 is usually long (e.g., 640 ms) and the legacy UE may only change the UL-DL configuration with a time equal to or longer than the minimum period of transmitting the SIB1. This semi-static resource allocation may not adapt to fast varying traffic characteristics and environments of the communication channels, and the system performance may be seriously deteriorated. 
     Thus, dynamically allocating the UL-DL configuration with a shorter period (e.g., less than 640 ms of the minimum period of transmitting the SIB1) is proposed for improving the system performance. Other problems, however, arise accompanied with the newly adopted techniques. For example, when the traffic adaptation mechanism is utilized, the UE may need to timely and frequently report the UCI so that the base station may have better understanding about the situation of the communication channels. The uplink resources are often limited and traditional UCI reporting mechanisms therefore cannot handle with the rapidly changing situation of the communication channels. Especially, the problem is more complicated when smaller ranged base stations are adopted, e.g., microcell base stations and femtocell base stations. 
     SUMMARY 
     In view of the foregoing, it may be appreciated that a substantial need exists for methods and apparatuses that mitigate or reduce the problems above. 
     An example embodiment of communication device is disclosed, comprising: a receiving circuit configured to operably receive an uplink-downlink (UL-DL) reconfiguration message from a communication station; an uplink control information generating circuit configured to operably generate a plurality of uplink control information (UCI); a transmitting circuit configured to operably transmit the UCI in a plurality of data frames, wherein each of the data frames comprises a plurality of subframes; and a control circuit configured to operably determine the communication device to operate in one or more UL-DL configurations of a first UCI configuration set according to the UL-DL reconfiguration message; wherein the UL-DL configurations are grouped into at least the first UCI configuration set and a second UCI configuration set; the first UCI configuration set and the second UCI configuration set comprise different UL-DL configurations. 
     An example embodiment of communication station is disclosed, configured to operably communicate with a communication device, comprising: a control circuit configured to operably generate an uplink-downlink (UL-DL) reconfiguration message for configuring a UL-DL configuration of the communication device; a transmitting circuit configured to operably transmit the UL-DL reconfiguration message to the communication device; and a receiving circuit configured to operably receive uplink control information (UCI) transmitted by the communication device; wherein the UL-DL reconfiguration message configures the communication device to operate in one or more UL-DL configurations of a first UCI configuration set; the UL-DL configurations are grouped into at least the first UCI configuration set and a second UCI configuration set; and the first UCI configuration set and the second UCI configuration set comprise different UL-DL configurations. 
     Both the foregoing general description and the following detailed description are examples and explanatory only, and are not restrictive of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a simplified functional block diagram of a communication system according to one embodiment of the present disclosure. 
         FIG. 2  shows a simplified schematic of the UL-DL resource assignments in different UL-DL configurations according to one embodiment of the present disclosure. 
         FIG. 3  shows a simplified schematic of valid UL-DL configurations in reconfiguration downlink control information according to one embodiment of the present disclosure. 
         FIG. 4  shows a simplified schematic of the UCI transmission according to one embodiment of the present disclosure. 
         FIG. 5  shows a simplified schematic of the UCI transmission according to another embodiment of the present disclosure. 
         FIG. 6  shows a simplified schematic of the UCI transmission according to another embodiment of the present disclosure. 
         FIG. 7  shows a simplified schematic of the UCI transmission according to another embodiment of the present disclosure. 
         FIGS. 8-10  show three example arrangements of the UCI configuration sets according to three embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference is made in detail to embodiments of the invention, which are illustrated in the accompanying drawings. The same reference numbers may be used throughout the drawings to refer to the same or like parts, components, or operations. 
     In the following description, a 3rd Generation Partnership Project (3GPP) communication system is utilized as examples. People skilled in the art may appreciate the present invention may also be applicable for other communication systems from consideration of the specification and practice of the invention disclosed herein. Moreover, the sounding reference signal (SRS) and the uplink control information (UCI), e.g., the channel status information (CSI) and the scheduling request (SR) in the 3GPP specification may be transmitted according to the embodiments disclosed herein. Although it is different from the definitions in the 3GPP specification, the sounding reference signal, the channel status information and the scheduling request are collectively referred to as the uplink control information (UCI) for concisely explaining the embodiments below. 
       FIG. 1  shows a simplified functional block diagram of a communication system  100  according to one embodiment of the present disclosure. 
     The communication system  100  comprises a communication station  120  and a communication device  140 . For the purposes of conciseness and clear explanation, other components of the communication system  100  are not shown in  FIG. 1 . 
     The communication station  120  comprises a control circuit  122 , a transmitting circuit  124  and a receiving circuit  126 . 
     The control circuit  122  is configured to operably generate one or more uplink-downlink (UL-DL) reconfiguration messages for configuring the UL-DL configuration of the communication device  140 . 
     The transmitting circuit  124  is configured to operably transmit the UL-DL reconfiguration message to the communication device  140 . 
     The receiving circuit  126  is configured to operably receive uplink control information (UCI) transmitted by the communication device  140 . 
     The communication station  120  may be realized with the node B, the evolved node B (eNB), the home node B, the base transceiver station or other suitable base stations. Although the control circuit  122 , the transmitting circuit  124  and the receiving circuit  126  are illustrated as separate functional blocks in  FIG. 1 , these circuits may be respectively realized with one or more circuit elements according to different design considerations. For example, the transmitting circuit  124  and the receiving circuit  126  may be realized in the same integrated circuit package. In other embodiments, one or more functions of the control circuit  122 , the transmitting circuit  124  and the receiving circuit  126  may be performed by the signal processor in combination with other circuit elements. 
     The communication device  140  comprises a receiving circuit  142 , an uplink control information generating circuit  144 , a transmitting circuit  146  and a control circuit  148 . 
     The receiving circuit  142  is configured to operably receive the UL-DL reconfiguration message from the communication station  120 . 
     The uplink control information generating circuit  144  is configured to operably generate a plurality of UCI. 
     The transmitting circuit  146  is configured to operably transmit the UCI in a plurality of data frames. Each of the data frames comprises a plurality of subframes. 
     The control circuit  148  is configured to operably determine the subframes of the data frame to be an uplink (UL) subframe, a downlink (DL) subframe or a special subframe according to the UL-DL reconfiguration message transmitted from the communication station  120 . 
     The uplink subframe is utilized for the communication device  140  to transmit the UL data to the communication station  120 . The downlink subframe is utilized for the communication device  140  to receive the DL data from the communication station  120 . The special subframe is positioned between the downlink subframe and the uplink subframe. A first partition of the special subframe may be utilized to transmit the downlink control information. The second partition of the special subframe is utilized as a guard period reserved for switching from the downlink subframe to the uplink subframe. The last partition of the special subframe may be utilized for the communication device  140  to transmit the UCI, e.g., the SRS. 
     The communication device  140  may be realized with mobile phones, tablet computers, suitable mobile devices or other user equipment (UE). Although the receiving circuit  142 , the uplink control information generating circuit  144 , the transmitting circuit  146  and the control circuit  148  are illustrated as separate functional blocks in  FIG. 1 , these circuits may be respectively realized with one or more circuit elements according to different design considerations. For example, the receiving circuit  142  and the transmitting circuit  146  and may be realized in the same integrated circuit package. In other embodiments, one or more functions of the receiving circuit  142 , the uplink control information generating circuit  144 , the transmitting circuit  146  and the control circuit  148  may be performed by the signal processor in combination with other circuit elements. 
     The communication device  140  may transmit several types of UCI for different purposes. For example, the UCI may comprise the CSI, the SRS, the SR and the hybrid automatic repeat request acknowledgement (HARQ-ACK). There may be multiple types of CSI, e.g., the wideband channel quality indicator (WB CQI), the subband CQI (SB CQI), the rank indicator (RI), and the precoding matrix indicator (PMI). The WB CQI is utilized to indicate the channel status of a wider bandwidth of the communication channel. The SB CQI is utilized to indicate the channel status of a specific bandwidth part (BP) of the wider bandwidth of the communication channel. 
     Moreover, the communication device  140  may be configured to periodically transmit the CSI to the communication station  120  according to several CSI reporting modes. For example, in the 3GPP communication system, the communication device  140  may be configured to transmit the WB CQI in a CSI reporting mode  1 - 0 ; transmit the RI, the WB CQI and the PMI in a CSI reporting mode  1 - 1 ; transmit the WB CQI, the UE selected SB CQI in a CSI reporting mode  2 - 0 ; and transmit the RI, the WB CQI, the UE selected SB CQI and the PMI in a CSI reporting mode  2 - 1 . 
       FIG. 2  shows a simplified schematic of the UL-DL resource assignments in different UL-DL configurations according to one embodiment of the present disclosure. 
     In this embodiment, a data frame comprises ten subframes and each subframe may be configured to be the uplink subframe (denoted as U in  FIG. 2 ), the downlink subframe (denoted as D in  FIG. 2 ) or the special subframe (denoted as S in  FIG. 2 ). The communication station  120  may configure the communication device  140  to perform communication in the suitable UL-DL configuration by utilizing the UL-DL reconfiguration message. Thus, the communication device  140  may communicate with the communication station  120  in the appropriate UL-DL configurations. 
     Moreover, multiple measurement sets of CSI may be configured for measuring the channel status according to the types of the subframes in the UL-DL configurations. For example, a first measurement set may be configured to be the subframes  0 ,  1 ,  5  and  6 . A second measurement set may be configured to be the subframes  3 ,  4 ,  7 ,  8  and  9 . By configuring multiple measurement sets, the communication device  140  may transmit CSI in a more flexibly manner in some UL-DL configurations. 
     For example, in 3GPP LTE system, the communication device  140  may obtain the UL HARQ reference UL-DL configuration and the DL HARQ reference UL-DL configuration from the higher layer signaling of the communication station  120 , e.g., the RRC configuration message. The communication device  140  may therefore obtain the valid UL-DL configurations in reconfiguration downlink control information (DCI), i.e., the UL-DL reconfiguration message. Compared with the time (640 ms or longer) for changing the UL-DL configuration of the legacy UE according to the System Information Block Type 1, the UL-DL reconfiguration message may change the UL-DL configuration in a shorter time (e.g., 10 ms, 20 ms, 40 ms and 80 ms). 
       FIG. 3  shows a simplified schematic of valid UL-DL configurations in reconfiguration DCI according to one embodiment of the present disclosure. Thus, in certain period of time, the communication station  120  may configure the communication device  140  to perform the communication by utilizing the valid UL-DL configurations. For example, the communication station  120  may configure the communication device  140  to perform the communication by utilizing the valid UL-DL configurations  0 - 6  in a certain period of time. In another embodiment, the communication station  120  may configure the communication device  140  to perform the communication by utilizing the valid UL-DL configurations  0 ,  1 ,  2  and  6  in a certain period of time. 
     Moreover, the communication station  120  may configure the communication device  140  to perform the communication by utilizing part of the valid UL-DL configurations in a certain period of time, e.g., utilizing the predetermined UL-DL configurations  0 ,  1 ,  6  of the valid UL-DL configurations  0 ,  1 ,  2 ,  6  in a certain period of time. The predetermined UL-DL configurations may be predefined or configured by higher layer signaling from the communication station  120 . 
       FIG. 4  shows a simplified schematic of the UCI transmission according to one embodiment of the present disclosure. 
     When the communication device  140  drops the CSI, the system performance may be influenced. In this embodiment, to minimize the situation that the CSI is dropped, the communication station  120  and the communication device  140  are configured to perform the periodic CSI reporting in the same subframe(s) of the data frames which is not configured to be the downlink subframe in the valid UL-DL configurations. In the embodiment in  FIG. 4 , the valid UL-DL configurations are configured to be the UL-DL configurations  0 - 6 . In view of the embodiment in  FIG. 2 , the subframe  2  is not configured to be the downlink subframe in the valid UL-DL configurations. In this embodiment, the communication station  120  and the communication device  140  perform a first UCI report configuration and the communication device  140  transmits the CSI in subframes  2  in the valid UL-DL configurations. 
     In frame  400 , the communication device  140  transmits the RI of the first measurement set in the subframe  2 . 
     In frame  401 , the communication device  140  transmits the WB CQI and the PMI of the first measurement set in the subframe  2 . 
     In frame  402 , the communication device  140  transmits the WB CQI and the PMI of the second measurement set in the subframe  2 . 
     In frame  403 , the communication device  140  transmits the SB CQI for a first BP of the first measurement set in the subframe  2 . 
     In frame  404 , the communication device  140  transmits the SB CQI for a first BP of the second measurement set in the subframe  2 . 
     In frame  405 , the communication device  140  transmits the SB CQI for a second BP of the first measurement set in the subframe  2 . 
     In frame  406 , the communication device  140  transmits the SB CQI for a second BP of the second measurement set in the subframe  2 . 
     In frame  407 , the communication device  140  transmits the SB CQI for a third BP of the first measurement set in the subframe  2 . 
     In frame  408 , the communication device  140  transmits the SB CQI for a third BP of the second measurement set in the subframe  2 . 
     In frame  409 , the communication device  140  transmits the SB CQI for a fourth BP of the first measurement set in the subframe  2 . 
     In frame  410 , the communication device  140  transmits the RI of the second measurement set in the subframe  2 . The SB CQI for a fourth BP of the second measurement set, which were to be transmitted in frame  410 , is dropped because its priority is lower than the priority of the RI of the second measurement set. 
     In frame  411 , the communication device  140  transmits the WB CQI and the PMI of the first measurement set in the subframe  2 . 
     In frame  412 , the communication device  140  transmits the WB CQI and the PMI of the second measurement set in the subframe  2 . 
     In frame  413 , the communication device  140  transmits the SB CQI for the first BP of the first measurement set in the subframe  2 . 
     In frame  414 , the communication device  140  transmits the SB CQI for the first BP of the second measurement set in the subframe  2 . 
     In frame  415 , the communication device  140  transmits the SB CQI for the second BP of the first measurement set in the subframe  2 . 
     In frame  416 , the communication device  140  transmits the SB CQI for the second BP of the second measurement set in the subframe  2 . 
     In frame  417 , the communication device  140  transmits the SB CQI for the third BP of the first measurement set in the subframe  2 . 
     In frame  418 , the communication device  140  transmits the SB CQI for the third BP of the second measurement set in the subframe  2 . 
     In frame  419 , the communication device  140  transmits the SB CQI for the fourth BP of the first measurement set in the subframe  2 . 
     In frame  420 , the communication device  140  transmits the RI of the first measurement set in the subframe  2 . The SB CQI for the fourth BP of the second measurement set is again dropped because its priority is lower than the priority of the RI of the first measurement set. 
     By utilizing the first UCI report configuration, the communication station  120  and the communication device  140  may perform the required periodic CSI reporting in the subframes of the data frames, which are not configured to be the downlink subframe in the valid UL-DL configurations. 
       FIG. 5  shows a simplified schematic of the UCI transmission according to one embodiment of the present disclosure. 
     In addition to the first UCI report configuration, additional UCI report configuration may be performed by the communication station  120  and the communication device  140  for transmitting more CSI with a shorter update period. 
     For example, when the communication station  120  and the communication device  140  are communicating by utilizing one or more predetermined UL-DL configurations of the valid UL-DL configurations, additional UCI may be transmitted in the subframe(s), which is not configured to be the downlink subframe in the predetermined UL-DL configurations, in addition to the UCI transmitted in the first UCI report configuration. 
     In this embodiment, the valid UL-DL configurations are configured to be the UL-DL configurations  0 - 6  and the predetermined UL-DL configurations are configured to be the UL-DL configurations  0 ,  1 ,  2  and  6 . Therefore, when the communication station  120  and the communication device  140  are communicating in the predetermined UL-DL configurations, the CSI may be additionally transmitted in the subframes  7  which are configured to be the uplink subframe in the predetermined UL-DL configurations  0 ,  1 ,  2  and  6 . The CSI additionally transmitted in the subframes  7  of the data frames may be transmitted with a predetermined time shift with respect to the CSI transmitted in the subframes  2  of the data frames to shorten the updated period of the CSI. For example, the communication device  140  may periodically transmit at least part of the CSI with substantially the same sequence and a predetermined time shift respectively in the subframes  2  and  7  of the data frames. Moreover, some CSI may be dropped because of the different priorities of the CSI. 
     For example, in the embodiment in  FIG. 5 , substantially the same sequence of the CSI, i.e., the WB CQI and the PMI of the first measurement set, the WB CQI and the PMI of the second measurement, the SB CQI for a first BP of the first measurement set, the SB CQI for the first BP of the second measurement set, the SB CQI for the second BP of the first measurement set, the SB CQI for the second BP of the second measurement set, the SB CQI for the third BP of the first measurement set, the SB CQI for the third BP of the second measurement set, the SB CQI for the fourth BP of the first measurement set, are transmitted respectively in the subframes  2  of the data frames  501 - 509  and in the subframes  7  of the data frames  506 - 514  with a predetermined time shift of five data frames (more precisely 55 subframes). The SB CQI for the second BP of the first measurement set is dropped in data frames  510  because its priority is lower than the priority of the RI. Moreover, the RI of the first measurement set is transmitted respectively in the subframe  2  of the data frame  500  and the subframe  7  of the data frame  510 . The RI of the second measurement set is transmitted respectively in the subframe  7  of the data frame  500  and the subframe  2  of the data frame  510 . Therefore, the updated period of the WB CQI, the SBCQI and the RI in the embodiment in  FIG. 5  are shortened in comparison with the embodiment in  FIG. 4 . 
     In frame  500 , the communication device  140  transmits the RI of the first measurement set in the subframe  2  and the RI of the second measurement set in the subframe  7 . 
     In frame  501 , the communication device  140  transmits the WB CQI and the PMI of the first measurement set in the subframe  2  and the SB CQI for the second BP of the second measurement set in subframe  7 . 
     In frame  502 , the communication device  140  transmits the WB CQI and the PMI of the second measurement set in the subframe  2  and the SB CQI for the third BP of the first measurement set in subframe  7 . 
     In frame  503 , the communication device  140  transmits the SB CQI for the first BP of the first measurement set in the subframe  2  and the SB CQI for the third BP of the second measurement set in subframe  7 . 
     In frame  504 , the communication device  140  transmits the SB CQI for the first BP of the second measurement set in the subframe  2  and the SB CQI for the fourth BP of the first measurement set in subframe  7 . 
     In frame  505 , the communication device  140  transmits of the SB CQI for the second BP the first measurement set in the subframe  2  and the SB CQI for the fourth BP of the second measurement set in subframe  7 . 
     In frame  506 , the communication device  140  transmits the SB CQI for the second BP of the second measurement set in the subframe  2  and the WB CQI and the PMI of the first measurement set in subframe  7 . 
     In frame  507 , the communication device  140  transmits the SB CQI for the third BP of the first measurement set in the subframe  2  and the WB CQI and the PMI of the second measurement set in subframe  7 . 
     In frame  508 , the communication device  140  transmits the SB CQI for the third BP of the second measurement set in the subframe  2  and the SB CQI for the first BP of the first measurement set in subframe  7 . 
     In frame  509 , the communication device  140  transmits the SB CQI for the fourth BP of the first measurement set in the subframe  2  and the SB CQI for the first BP of the second measurement set in subframe  7 . 
     In frame  510 , the communication device  140  transmits the RI of the second measurement set in the subframe  2  and the RI of the first measurement set in the subframe  7 . The SB CQI for the fourth BP of the second measurement set and the SB CQI for the second BP of the first measurement set are dropped because their priority are lower than the priority of the RI. 
     In frame  511 , the communication device  140  transmits the WB CQI and the PMI of the first measurement set in the subframe  2  and the SB CQI for the second BP of the second measurement set in subframe  7 . 
     In frame  512 , the communication device  140  transmits the WB CQI and the PMI of the second measurement set in the subframe  2  and the SB CQI for the third BP of the first measurement set in subframe  7 . 
     In frame  513 , the communication device  140  transmits the SB CQI for the first BP of the first measurement set in the subframe  2  and the SB CQI for third BP of the second measurement set in subframe  7 . 
     In frame  514 , the communication device  140  transmits the SB CQI for the first BP of the second measurement set in the subframe  2  and the SB CQI for the fourth BP of the first measurement set in subframe  7 . 
     In frame  515 , the communication device  140  transmits the SB CQI for the second BP of the first measurement set in the subframe  2  and the SB CQI for the fourth BP of the second measurement set in subframe  7 . 
     In frame  516 , the communication device  140  transmits the SB CQI for the second BP of the second measurement set in the subframe  2  and the WB CQI and the PMI of the first measurement set in subframe  7 . 
     In frame  517 , the communication device  140  transmits the SB CQI for the third BP of the first measurement set in the subframe  2  and the WB CQI and the PMI of the second measurement set in subframe  7 . 
     In frame  518 , the communication device  140  transmits the SB CQI for the third BP of the second measurement set in the subframe  2  and the SB CQI for the first BP of the first measurement set in subframe  7 . 
     In frame  519 , the communication device  140  transmits the SB CQI for the fourth BP of the first measurement set in the subframe  2  and the SB CQI for the first BP of the second measurement set in subframe  7 . 
     In frame  520 , the communication device  140  transmits the RI of the first measurement set in the subframe  2  and the RI of the second measurement set in the subframe  7 . The SB CQI for the fourth BP of the second measurement set and the SB CQI for the second BP of the first measurement set are dropped because their priority are lower than the priority of the RI. 
     By utilizing both the first UCI report configuration and the additional UCI report configuration, the communication station  120  and the communication device  140  may not only perform the required periodic CSI reporting but also shorten the CSI update period. For example, the update period of the RI has been shortened from  20  data frames to 10 data frames, and the update period of the WB CQI and the SB CQI has been shortened from 10 data frames to 5 data frames. Therefore, the communication station  120  and the communication device  140  may have better understanding about the instant channel status. 
       FIG. 6  shows a simplified schematic of the UCI transmission according to another embodiment of the present disclosure. 
     The additional UCI report configuration may also be configured to transmit the UCI in other suitable manners. For example, in the embodiment in  FIG. 6 , the valid UL-DL configurations are configured to be the UL-DL configurations  0 - 6  and the predetermined UL-DL configurations are configured to be the UL-DL configurations  0 ,  1 ,  2  and  6 . Therefore, when the communication station  120  and the communication device  140  are communicating in the predetermined UL-DL configurations, the UCI may be additionally transmitted in the subframes  7  which are configured to be the uplink subframe in the predetermined UL-DL configurations. Moreover, the communication device  140  transmits the UCI in subframes  2  of the data frames according to the CSI reporting mode  1 - 1  and transmits the UCI in subframes  7  of the data frames according to the CSI reporting mode  2 - 1 . 
     As shown in  FIG. 6 , when the communication station  120  and the communication device  140  are communicating in the predetermined UL-DL configurations, the communication device  140  transmits the RI, the WB CQI and the PMI according to the CSI reporting mode  1 - 1  in subframes  2  of the data frames and transmits the RI, the SB CQI and the PMI according to the CSI reporting mode  2 - 1  in subframes  7  of the data frames. 
     In other embodiments, the valid UL-DL configurations are configured to be the UL-DL configurations  0 - 6  and the predetermined UL-DL configurations are configured to be the UL-DL configurations  0 ,  1 ,  2  and  6 . Therefore, when the communication station  120  and the communication device  140  are communicating in the predetermined UL-DL configurations, the CSI may be additionally transmitted in the subframes  7  which are configured to be the uplink subframe in the predetermined UL-DL configurations. Moreover, the communication device  140  transmits the CSI in subframes  2  of the data frames according to the CSI reporting mode  1 - 1  and transmits the CSI designated according any suitable selection rule in subframes  7  of the data frames. For example, the designated CSI transmitted in the subframes  7  of the data frames may be configured to be the designated SB CQI for each bandwidth parts, the designated SB CQI for specific bandwidth part(s), the designated WB CQI, etc. 
     In other embodiments, the communication device  140  may report other types of UCI according to the UCI report configurations described in the embodiments above. For example, the valid UL-DL configurations are configured to be the UL-DL configurations  0 ,  1 ,  2  and  6 , and the predetermined UL-DL configurations are configured to be the UL-DL configurations  0 ,  1  and  6 . The communication device  140  may transmit the SR in the subframes  2  of the data frames in the valid UL-DL configurations  0 ,  1 ,  2  and  6 . Moreover, additional SR may be transmitted in the subframes  8  of the data frames which are configured to be the uplink subframe in the predetermined UL-DL configurations  0 ,  1  and  6 . 
       FIG. 7  shows a simplified schematic of the UCI transmission according to another embodiment of the present disclosure. 
     Because the UCI have different priority and the uplink resource is limited, the lower priority UCI may often be dropped. In this embodiment, further to the first UCI report configuration, an additional UCI report configuration may be performed by the communication station  120  and the communication device  140  to transmit the lower priority UCI, e.g., the SRS. 
     In this embodiment, the SRS is configured to be periodically transmitted in the same subframe(s) of the data frames which is not configured to be the downlink subframe in the valid UL-DL configurations  0 - 6 . In view of the embodiment in  FIG. 2 , the subframe  1  is not configured to be the downlink subframe in the valid UL-DL configurations  0 - 6 . In this embodiment, the communication device  140  periodically transmits the SRS in subframes  1  of the data frames to the communication station  120  in the valid UL-DL configurations  0 - 6 . 
     Moreover, when the communication station  120  and the communication device  140  are communicating in the predetermined UL-DL configurations  0 ,  1  and  6 , the UCI may be additionally transmitted in the subframe  8  which is configured to be the uplink subframe in the predetermined UL-DL configurations  0 ,  1  and  6 . 
     As shown in  FIG. 7 , when the communication device  140  transmits the data frames  700 - 709  by utilizing the UL-DL configurations  2 ,  3 ,  4  and  5 , the SRS is transmitted in the subframe  1  of every fourth data frame. When the communication device  140  transmits the data frames  710 - 719  by utilizing the UL-DL configurations  0 ,  1  and  6 , the SRS is transmitted not only on the subframe  1  of every fourth data frame but also in the subframe  8  of every data frames. Therefore, more SRS may be transmitted in the predetermined UL-DL configurations  0 ,  1  and  6  and a better system performance may be achieved. 
     In the embodiments above, the subframe  2  of the data frame is always configured to be the uplink subframe and the subframe  8  may be configured to be either uplink subframe or downlink subframe in the valid UL-DL configuration. When the communication station  120  estimates the UL channel status by utilizing the SRS transmitted in the subframe  2 , the estimation might not be accurate for the channel status of the subframe  8  because there might be interferences in the channel of the subframe  8  from the DL signals of other communication stations. By utilizing the SRS transmitted in the subframes  2  and  8  for estimating the UL channel status, the communication station  120  may have a better understanding about the communication channels and obtain a better resource scheduling performance. 
     Moreover, according to the UL-DL resource assignments, the UL-DL configurations may be further grouped into a plurality of UCI configuration sets to further improve the reporting mechanism. For example, the communication station  120  may configure the communication device  140  to apply the UCI configuration set by utilizing the UL-DL reconfiguration message (e.g., the RRC signaling or other higher layer signaling). 
       FIGS. 8-10  show three example arrangements of the UCI configuration sets according to three embodiments of the present disclosure. In  FIGS. 8-10 , the UL-DL configurations are grouped into several UCI configuration sets. The communication station  120  may configure the communication device  140  to apply the UCI configuration set so that the valid UL-DL configurations may be chosen appropriately according to the channel condition, the reporting period of the UCI or other different design considerations. 
     In  FIG. 8 , the UL-DL configurations are grouped into four UCI configuration sets. The first UCI configuration set comprises the UL-DL configurations  0 ,  1  and  6 . The second UCI configuration set comprises the UL-DL configuration  2 . The third UCI configuration set comprises the UL-DL configurations  3  and  4 . The fourth UCI configuration set comprises the UL-DL configuration  5 . 
     In view of the UL-DL resource assignments of the UL-DL configurations in  FIG. 2 , in the first UCI configuration set, the UCI may be reported in the subframes  2 ,  3 ,  7  and  8  of the data frames, and the reporting period of the UCI is approximately 2.5 ms when a 10 ms data frame is utilized. In the second UCI configuration set, the UCI may be reported in the subframes  2  and  7  of the data frames, and the reporting period of the UCI is approximately 5 ms when a 10 ms data frame is utilized. In the third UCI configuration set, the UCI may be reported in the subframes  2  and  3  of the data frames, and the reporting period of the UCI is approximately 5 ms when a 10 ms data frame is utilized. In the fourth UCI configuration set, the UCI may be reported in the subframes  2  of the data frames, and the reporting period of the UCI is approximately 10 ms when a 10 ms data frame is utilized. 
     In  FIG. 9 , the UL-DL configurations are grouped into two UCI configuration sets. The first UCI configuration set comprises the UL-DL configurations  0 ,  1  and  6 . The second UCI configuration set comprises the UL-DL configurations  2 ,  3 ,  4  and  5 . 
     In view of the UL-DL resource assignments of the UL-DL configurations in  FIG. 2 , in the first UCI configuration set, the UCI may be reported in the subframes  2 ,  3 ,  7  and  8  of the data frames, and the reporting period of the UCI is approximately 2.5 ms when a 10 ms data frame is utilized. In the second UCI configuration set, the UCI may be reported in the subframes  2  of the data frames, and the reporting period of the UCI is approximately 10 ms when a 10 ms data frame is utilized. 
     In  FIG. 10 , the UL-DL configurations are grouped into three UCI configuration sets. The first UCI configuration set comprises the UL-DL configurations  0 ,  1 ,  2  and  6 . The second UCI configuration set comprises the UL-DL configurations  3  and  4 . The third UCI configuration set comprises the UL-DL configurations  5 . 
     In view of the UL-DL resource assignments of the UL-DL configurations in  FIG. 2 , in the first UCI configuration set, the UCI may be reported in the subframes  2  and  7  of the data frames, and the reporting period of the UCI is approximately 5 ms when a 10 ms data frame is utilized. In the second UCI configuration set, the UCI may be reported in the subframes  2  and  3  of the data frames, and the reporting period of the UCI is approximately 5 ms when a 10 ms data frame is utilized. In the third UCI configuration set, the UCI may be reported in the subframes  2  of the data frames, and the reporting period of the UCI is approximately 10 ms when a 10 ms data frame is utilized. 
     In the embodiments in  FIGS. 8-10 , the UCI configuration sets may be respectively associated with predetermined UCI reporting configuration(s) which may be stored in the memory units of the communication station  120  and the communication device  140  (not shown in  FIG. 1 ). 
     Because the UL-DL configurations with similar UL subframe allocations are grouped into a UCI configuration set (e.g., the UL-DL configurations  0 ,  1 , and  6  have the UL subframes at subframes  2 ,  3 ,  7  and  8 ), the UCI report configurations may be simplified in the UCI configuration set. Therefore, by utilizing the UCI configuration sets, the communication station  120  and the communication device  140  do not need to frequently change the UCI report configurations and may perform the reporting mechanism more efficiently. The system design complexity may be simplified and the system performance may be improved accordingly. 
     Compared with changing the UL-DL configuration of the communication device with the System Information Block Type 1 (SIB1), the UL-DL reconfiguration message may change the UL-DL configuration of the communication device in a shorter period. The communication system may therefore more adapt to the rapid varying communication channels. Moreover, the UCI reporting configuration may be simplified when communicating in the valid UL-DL configuration and in the predetermined UL-DL configuration. 
     In the above embodiments, the UCI reporting configuration may be easily implemented for reporting the CSI, SR and/or SRS in all the valid UL-DL configurations and the predetermined UL-DL configurations in  FIG. 2 . The communication device may transmit the UCI more flexibly according to the valid UL-DL configurations and the predetermined UL-DL configurations, and provide additional UCI to the communication station for improving system performance. 
     Certain terms are used throughout the description and the claims to refer to particular components. One skilled in the art appreciates that a component may be referred to as different names. This disclosure does not intend to distinguish between components that differ in name but not in function. In the description and in the claims, the term “comprise” is used in an open-ended fashion, and thus should be interpreted to mean “include, but not limited to.” The phrases “be coupled with,” “couples with,” and “coupling with” are intended to compass any indirect or direct connection. Accordingly, if this disclosure mentioned that a first device is coupled with a second device, it means that the first device may be directly or indirectly connected to the second device through electrical connections, wireless communications, optical communications, or other signal connections with/without other intermediate devices or connection means. 
     The term “and/or” may comprise any and all combinations of one or more of the associated listed items. In addition, the singular forms “a,” “an,” and “the” herein are intended to comprise the plural forms as well, unless the context clearly indicates otherwise. 
     Throughout the description and claims, the term “element” contains the concept of component, layer, or region. 
     In the drawings, the size and relative sizes of some elements may be exaggerated or simplified for clarity. Accordingly, unless the context clearly specifies, the shape, size, relative size, and relative position of each element in the drawings are illustrated merely for clarity, and not intended to be used to restrict the claim scope. 
     Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention indicated by the following claims.