WO2014208924A1 - Method and device for processing uplink transmission - Google Patents

Method and device for processing uplink transmission Download PDF

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Publication number
WO2014208924A1
WO2014208924A1 PCT/KR2014/005349 KR2014005349W WO2014208924A1 WO 2014208924 A1 WO2014208924 A1 WO 2014208924A1 KR 2014005349 W KR2014005349 W KR 2014005349W WO 2014208924 A1 WO2014208924 A1 WO 2014208924A1
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Prior art keywords
sub
frames
frame
transmission
grant
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PCT/KR2014/005349
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English (en)
French (fr)
Inventor
Yingyang Li
Bin Yu
Shichang Zhang
Chengjun Sun
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Samsung Electronics Co., Ltd.
Beijing Samsung Telecom R&D Center
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Publication of WO2014208924A1 publication Critical patent/WO2014208924A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile

Definitions

  • the present disclosure relates to a wireless communication system, and more particularly, to a method and device for processing Uplink (UL) transmission in a Long Term Evolution (LTE) system, in which a duplex direction of a sub-frame is flexibly changed.
  • UL Uplink
  • LTE Long Term Evolution
  • the LTE system supports a Time Division Duplex (TDD) operating mode.
  • TDD Time Division Duplex
  • figure 1 illustrates structure of a frame of a TDD system. Length of each wireless frame is 10ms. The wireless frame is equally divided into two half-frames, each of which is 5ms. Each half-frame includes eight timeslots, each of which is 0.5ms and three special domains, i.e., a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP) and an Uplink Pilot Time Slot (UpPTS). The length of the three special domains is 1ms.
  • Each sub-frame consists of two consecutive time slots. That is, the k-th sub-frame includes: time slot (2k) and time slot (2k+1).
  • the TDD system supports seven kinds of UL and DL configurations. Referring to table 1, D represents a DL sub-frame, U represents a UL sub-frame and S represents a special sub-frame including the above three special domains.
  • a UL and DL configuration adopted by a cell is configured via broadcast signaling. That is, the UL and DL configuration is included in a System Information Block 1 (SIB1). Therefore, in the LTE system, the UL and DL configuration is changed once with a minimum time of 640ms. According to the conventional standard, system information is changed at most 32 times in three hours.
  • the 3rd Generation Partnership Project (3GPP) organization is researching how to change distribution of UL and DL sub-frames of the system faster. According to a current discussion result, the TDD UL and DL configuration is changed in a magnitude of 10ms.
  • the physical layer signaling indicates that the TDD UL and DL configuration is one of the seven kinds of TDD UL and DL configurations shown in table 1.
  • the DwPTSs in sub-frame 0, sub-frame 5, sub-frame 1 and sub-frame 6 are used for DL transmission.
  • Interference characteristics of the sub-frame 0, sub-frame 5, sub-frame 1 and sub-frame 6 are the same as those of DL sub-frames in the conventional LTE system.
  • Sub-frame 2 is used for UL transmission.
  • the interference characteristics of the sub-frame 2 are the same as those of a UL sub-frame in the conventional LTE system.
  • sub-frame 3, sub-frame 4, sub-frames 7 to 9 are configured as DL sub-frames.
  • the sub-frame 3, sub-frame 4, sub-frames 7 to 9 are configured as UL sub-frames.
  • the interference distribution of the sub-frame 3, sub-frame 4 sub-frames 7 to 9 is different from that in the conventional LTE system.
  • reference UL and DL configurations are respectively configured for UL data transmission and DL data transmission.
  • the reference UL and DL configurations are pre-defined or configured semi-statically configured with high-layer signaling.
  • the DL sub-frames form a superset of DL sub-frames, which are used in practice, of the TDD UL and DL configurations.
  • the UL sub-frames form a superset of UL sub-frames, which are used in practice, of the TDD UL and DL configurations.
  • an eNB controls a method for processing HARQ-ACK information when the UE feeds back the HARQ-ACK on a Physical Uplink Shared Channel (PUSCH) via setting a UL Downlink Assignment Index (DAI) in the UL Grant.
  • PUSCH Physical Uplink Shared Channel
  • the UL reference UL and DL configuration is the UL and DL configuration 0 and the UL Grant carries the UL index but does not carry the UL DAI, resulting in that the UE only can feed back the HARQ-ACK according to the maximum binding window. Therefore, resources are wasted.
  • How to enhance resource utilization rate of feedback of the HARQ-ACK on the PUSCH is a problem to be solved when the UL reference UL and DL configuration 0 is adopted.
  • the present disclosure may aim to provide a method and device for processing UL transmission to ensure validity of power control, enhance performances of UL transmission and ensure transmission performances of the A-CSI.
  • the present disclosure may disclose a method for processing UL transmission, including:
  • UE User Equipment
  • PUSCH Physical Uplink Shared Channel
  • A-CSI Aperiodic-Channel State Information
  • the present disclosure may further provide another method for processing UL transmission, including:
  • the present disclosure may further provide a device for processing UL transmission, including: a configuration module, a receiving module and a transmission module.
  • the configuration module is configured to receive a UL reference UL and DL configuration and information of interference levels of UL sub-frames
  • the receiving module is configured to receive a UL Grant
  • the transmission module is configured to determine a mode for transmitting a PUSCH and/or A-CSI according to the interference levels of the UL sub-frames when UL transmission of two sub-frames is simultaneously scheduled by the UL Grant.
  • the present disclosure may further disclose a method for processing UL transmission, including: a configuration module, a receiving module and a transmission module.
  • the configuration module is configured to receive a UL reference UL and DL configuration
  • the receiving module is configured to receive a UL Grant and obtain UL sub-frames which are currently scheduled by an eNB and an instruction of number of bits of HARQ-ACK information which needs to be fed back from a UL index domain;
  • the transmission module is configured to transmit PUSCH and HARQ-ACK information, length of which is the number of the bits.
  • the technical scheme of the present disclosure when the UL reference UL and DL configuration 0 is adopted, the validity of power control may be ensured, performances of the UL transmission may be enhanced and transmission performances of the A-CSI may be ensured.
  • the technical scheme of the present disclosure may further reduce overhead for transmitting the HARQ-ACK on the PUSCH.
  • Figure 1 is a schematic diagram illustrating structure of a frame of a TDD system
  • Figure 2 is a schematic diagram illustrating PUSCH scheduling timing of TDD UL and DL configuration 0 in accordance with an example of the present disclosure
  • Figure 3 is a flow chart illustrating a method for processing uplink transmission in accordance with an example of the present disclosure
  • Figure 4 is a flow chart illustrating another for processing uplink transmission in accordance with an example of the present disclosure.
  • Figure 5 is a schematic diagram illustrating structure of device for processing UL transmission in accordance with an example of the present disclosure.
  • sub-frames may be used for UL transmission in partial of cells and used for DL transmission in other cells. These sub-frames may be called flexible frames.
  • UL data transmission may be processed according to the “UL reference UL and DL configuration”. That is, the UL data transmission may be irrelevant with distribution of UL sub-frames in the current TDD UL and DL configuration.
  • the scheduling timing, HARQ-ACK timing and retransmission timing may be determined according to UL reference UL and DL configuration.
  • the UL reference UL and DL configuration 0 may be adopted. Any of the seven kinds of TDD UL and DL configurations may be taken as an actual TDD UL and DL configuration using the UL reference UL and DL configuration 0.
  • an actual UL reference UL and DL configuration 0 may be configured when UL and DL traffic is small using the UL reference UL and DL configuration 0, so that the number of the DL sub-frames and energy loss of the eNB may be reduced and energy loss generated by blind detection performed by the UE for a DL control channel may be reduced.
  • the UL transmission of two UL sub-frames may be scheduled once by one UL Grant. Since adjacent cells may adopt different UL and DL configurations, interference distribution of two UL sub-frames scheduled by the UL Grant may be different, which may be described hereinafter with reference to figure 2.
  • Figure 2 is a schematic diagram illustrating PUSCH scheduling timing of the TDD UL and DL configuration 0. Referring to figure 2, it may be assumed that only the sub-frame 2 may be a fixed UL sub-frame of a wireless frame.
  • the UL Grant transmitted in the sub-frame 5 may simultaneously schedule the UL transmission of the sub-frame 9 and sub-frame 12.
  • the sub-frame 12 may be the fixed UL sub-frame and the interference level of the sub-frame 12 may be the same as that in the conventional system.
  • the sub-frame 9 may be the flexible sub-frame and may be likely to be affected by DL interference of the adjacent cell and the interference level of the sub-frame 9 may be relatively high.
  • the UL Grant transmitted in the sub-frame 6 may simultaneously schedule the UL transmission of the sub-frame 12 and sub-frame 13.
  • the sub-frame 12 may be the fixed UL sub-frame and the interference level of the sub-frame 12 may be the same as that in the conventional LTE system.
  • the sub-frame 13 may be the flexible sub-frame and may be affected by DL interference of the adjacent cell.
  • the interference level of the sub-frame 13 may be relatively high.
  • the UL Grant transmitted on the sub-frame 1 may simultaneously schedule the UL transmission of the sub-frame 7 and the sub-frame 8.
  • the sub-frame 7 and sub-frame 8 are flexible sub-frames, the sub-frame 7 may be less likely to be affected by the DL interference of the adjacent cell than the sub-frame 8. Therefore, the interference with the sub-frame 7 may be less than the interference with the sub-frame 8.
  • the UL Grant transmitted on the sub-frame 0 may simultaneously schedule the UL transmission of the sub-frame 4 and sub-frame 7.
  • the sub-frame 4 and sub-frame 7 may be the flexible sub-frames. If the actual TDD UL and DL configuration of a main-interference adjacent cell is a configuration 1 or configuration 2, the sub-frame 4 may be affected by strong DL interference of the adjacent cell and the interference level of the sub-frame 4 may be higher than that of the sub-frame 7. If the actual TDD UL and DL configuration of the main-interference adjacent cell is a configuration 3, the sub-frame 7 may be affected by strong DL interference of the adjacent cell and the interference level of the sub-frame 7 may be higher than that of the sub-frame 4.
  • the DL interference of the adjacent cell with the sub-frame 4 may be larger than that of the sub-frame 7.
  • an example of the present disclosure may provide two preferred methods for processing the UL transmission, which may be described hereinafter in detail with reference to accompanying figures.
  • Figure 3 is a flow chart illustrating a method for processing UL transmission in accordance with an example of the present disclosure.
  • the method may include following blocks.
  • a UE may receive a UL reference UL and DL configuration configured by an eNB and an instruction of interference levels of UL sub-frames.
  • This example may mainly describe a situation that the UL reference UL and DL configuration 0 may be configured. Interference levels of different UL sub-frames may be distinguished by dividing the UL sub-frames into two or multiple sets.
  • the UE may receive a UL Grant from the eNB.
  • the UE may further make a determination as to whether the eNB may simultaneously schedule the UL transmission of two sub-frames.
  • a method for transmitting the PUSCH and Aperiodic-Channel State Information may be determined according to the interference levels of the UL sub-frames.
  • a preferred example for processing the UL transmission may be described hereinafter based on the UL reference UL and DL configuration 0.
  • the interference level of each UL sub-frame may be different.
  • the flexible sub-frame may be interfered with the DL transmission of the adjacent cell and the interference level may be relatively high.
  • a UL transmission performance of the flexible sub-frame interfered with the DL transmission of the adjacent cell may be improved by configuring different UL power control parameters for different UL sub-frames.
  • the sub-frames may be divided into two or more than two sub-frame sets and the power of the sub-frames may be respectively controlled. For instance, if the sub-frames are divided into two sub-frame sets, the sub-frames may be divided into a fixed UL sub-frame set and a flexible sub-frame set. The fixed UL sub-frame set may use a set of closed-loop power control parameters. The flexible sub-frame set may use another set of closed-loop power control parameters. Alternatively, the sub-frames may be divided into the sub-frame sets according to the interference levels of the sub-frames.
  • the fixed UL sub-frames and flexible sub-frames which may not be affected by relatively strong DL interference of the adjacent cell may be divided into a same set.
  • Flexible sub-frames which may be affected by relatively strong DL interference may be divided into another set.
  • Each of the two sets may respectively use a set of closed-loop power control parameters.
  • TPC Transmission Power Control
  • the first method may be that the TPC in the UL Grant may be only used for controlling the transmission power of one UL sub-frame.
  • the high-layer signaling may be used for configuring that the transmission power of which UL sub-frame may be controlled by the TPC. For instance, the high-layer signaling may be used for configuring the UL sub-frame, to which the TPC may be applied.
  • the TPC may be used for controlling the transmission power of the UL sub-frames with relatively high interference level, so that the UL transmission performance of the UL sub-frame with relatively high interference level may be ensured and the difference between the transmission performance of the sub-frame of with relatively high interference level of and the UL sub-frame with the relatively low interference level may be made up.
  • a TPC domain of the UL Grant may be used for adjusting the transmission power of a sub-frame (n+4) (i.e., a sub-frame 4 or a sub-frame 9).
  • the TPC domain of the UL Grant may be used for adjusting the transmission power of a sub-frame (n+7) (i.e., a sub-frame 8 or sub-frame 13).
  • the TPC may be used for controlling transmission power of a UL sub-frame with relatively low interference level, so that the stability of the system may be ensured. That is, it may be ensured at least that the UL transmission of the UL sub-frame with relatively low interference level may be reliable.
  • the TPC domain may be used for adjusting the transmission power of the sub-frame (n+7) (i.e., the sub-frame 7 or 12).
  • the TPC domain may be used for adjusting the transmission power of the sub-frame (n+6) (i.e., sub-frame 7 or 12).
  • the second method may be that the TPC in the UL Grant may be only used for controlling transmission power of the UL sub-frames of one UL sub-frame set.
  • the high-layer signaling may be used for configuring that transmission power of the UL sub-frames of which UL sub-frame set may be controlled by the TPC. That is, the UL sub-frame set, to which the TPC may be applied, may be configured with the high-layer signaling.
  • the TPC may be used for controlling transmission power of a UL sub-frame set with relatively high interference level, so that the UL transmission performance of the UL sub-frame set with the relatively high interference level may be ensured and difference of the transmission performance between the sub-frame set with the relatively high interference level and the UL sub-frame set with the relatively low interference level.
  • n may equal to 0 or 5.
  • the two sub-frames may belong to different sub-frame sets and the interference level of the sub-frame (n+4) (i.e., the sub-frame 4 or 9) is higher than that of the sub-frame (n+7), the TPC may be used for adjusting the transmission power of the sub-frame (n+4).
  • the two sub-frames may belong to different sub-frame sets and the interference level of the sub-frame (n+7) (i.e., the sub-frame 8 or 13) may be higher than that of the sub-frame (n+6), the TPC may be used for adjusting the transmission power of the sub-frame (n+7). It may be assumed that the two UL sub-frames may belong to the sub-frame sets with relatively high interference level and the TPC may be simultaneously applied to the two UL sub-frames.
  • the TPC may be used for controlling transmission power of a UL sub-frame with relatively low interference level, so that the stability of the system may be ensued. That is, it may be ensured that the UL transmission of the UL sub-frame set with relatively low interference level may be reliable.
  • the two sub-frames may respectively belong to different sub-frame sets and the interference level of the sub-frame (n+4) (i.e., the sub-frame 4 or sub-frame 9) may be higher than that of the sub-frame (n+7), the TPC may be used for adjusting the transmission power of the sub-frame (n+7).
  • the two sub-frames may belong to different sub-frame sets and the interference level of the sub-frame (n+7) (i.e., the sub-frame 8 or 13) may be higher than that of the sub-frame (n+6), the TPC may be used for adjusting the transmission power of the sub-frame (n+6). It may be assumed that the two sub-frames belong to the sub-frame set with the relatively low interference level and the TPC may be applied to the two UL sub-frames.
  • the TPC may be applied to the two UL sub-frames.
  • the value of the TPC parameter may be recorded as a.
  • Cumulative power of the previous UL sub-frame of the two currently-scheduled sub-frames may be adjusted as f.
  • the transmission power of the two UL sub-frames may be (f+a).
  • the transmission power of the two UL sub-frames may respectively be (f+a) and (f+2a). It may be determined that the transmission power of the two UL sub-frames may respectively be (f+a) and (f+2a) in chronological order of the two sub-frames.
  • the transmission power of the UL sub-frame with relatively low interference level may be (f+a) and the transmission power of the UL sub-frame with the relatively high interference level may be (f+2a).
  • the two UL sub-frames, which may be simultaneously scheduled, may belong to the same sub-frame set, the interference levels of the two sub-frames may be different. It may be beneficial to enhance the UL transmission performance by setting relatively large power adjustment value for the sub-frame with the relatively high interference level.
  • n may equal to 0 or 5.
  • the two sub-frames may belong to the same sub-frame set and the interference level of the sub-frame (n+4) (i.e., the sub-frame 4 or 9) is higher than that of the sub-frame (n+7)
  • the transmission power of the sub-frame (n+4) and the sub-frame (n+7) may respectively be (f+2a) and (f+a).
  • the two sub-frames may belong to the same sub-frame set and the interference level of the sub-frame (n+7) (i.e., the sub-frame 8 or 13) may be higher than that of the sub-frame (n+6), the transmission power of the sub-frame (n+6) and sub-frame (n+7) may respectively be (f+a) and (f+2a).
  • the third method may be determining adjusting the transmission power of which UL sub-frame with a UL index domain in the UL Grant. That is, the sub-frame, to which the TPC may be applied, may be indicated by the UL index domain in the UL Grant.
  • the UL index domain may include 2 bits. At present, three code words of the UL index domain may be used for indicating the UL scheduling. Code word “10” and code word “01” may indicate that the UL transmission of only one UL sub-frame may be scheduled at present, code word “11” may indicate that the UL transmission of two UL sub-frames may be scheduled and code word “00” may not be used. In this method, the two code words of the UL index may indicate that data transmission of two UL sub-frames may be simultaneously scheduled. For instance, the code word “11” and code word “00” may indicate that the data transmission of two UL sub-frames may be scheduled simultaneously and the two code words may respectively indicate that the TPC domain may be applied to which UL sub-frame.
  • the TPC in the UL Grant may be applied to only one UL sub-frame.
  • the UL index may be configured with a following method.
  • Code word “10” and code word “01” may be used for indicating that the UL transmission of only one UL sub-frame may be scheduled at present.
  • the code word “11” may indicate that the UL transmission of two UL sub-frames may be simultaneously scheduled and the TPC in the UL Grant may be used for performing the closed-loop power control for the sub-frame (n+4).
  • the code word “00” may indicate that the UL transmission of the two UL sub-frames may be simultaneously scheduled and the TPC in the UL Grant may be used for performing the closed-loop power control for the sub-frame (n+7). Accordingly, table 3 may illustrate the configuration of the UL index of the UL Grant transmitted on the sub-frame 1 and the sub-frame 6.
  • the fourth method may be that the UL index domain in the UL Grant may be used for determining adjusting the transmission power of the UL sub-frame of which UL sub-frame set. That is, the UL sub-frame set, to which the TPC may be applied, may be indicated with the UL index domain in the UL Grant.
  • the UL index domain may include 2 bits.
  • three code words of the UL index domain may be used for indicating the UL scheduling.
  • Code word “10” and code word “01” may indicate that the UL transmission of only one UL sub-frame may be scheduled at present, code word “11” may indicate that the UL transmission of two UL sub-frames may be scheduled and code word “00” may not be used.
  • the data transmission of two UL sub-frames may be simultaneously scheduled with two code words of the UL index domain.
  • code word “11” and code word “00” may indicate that the data transmission of two UL sub-frames may be simultaneously scheduled and the two code words may respectively indicate that the TPC domain may be applied to the UL sub-frame of which UL sub-frame set.
  • the TPC in the UL Grant may be applied to UL sub-frames of only one UL sub-frame set.
  • the UL index may be configured with a following method.
  • Code word “10” and code word “01” may be used for indicating that the UL transmission of only one UL sub-frame may be scheduled at present.
  • the code word “11” may indicate that the UL transmission of two UL sub-frames may be simultaneously scheduled and the TPC in the UL Grant may be used for performing the closed-loop power control for the UL sub-frames of the first sub-frame set.
  • the code word “00” may indicate that the UL transmission of the two sub-frames may be simultaneously scheduled and the TPC in the UL Grant may be used for performing the closed-loop power control for the UL sub-frames in the second sub-frame set.
  • the first sub-frame set and the second sub-frame set may respectively represent the fixed UL sub-frame set and the flexible sub-frame set.
  • the sub-frame set may be configured according to an interference situation of the UL sub-frame. Accordingly, table 5 may illustrate the configuration of the UL index domain of the UL Grant transmitted on the sub-frame 1 and the sub-frame 6.
  • the UL index may be used for indicating that the transmission power of which UL sub-frame may be adjusted by the TPC.
  • an appropriate UL index may be set and the TPC may be applied to the two UL sub-frames.
  • the value of the TPC parameter may be recorded as a.
  • Cumulative power of the previous UL sub-frame of the two currently-scheduled sub-frames may be adjusted as f.
  • the transmission power of the two UL sub-frames may be (f+a).
  • the transmission power of the two UL sub-frames may respectively be (f+a) and (f+2a). It may be determined that the transmission power of the two UL sub-frames may respectively be (f+a) and (f+2a) in chronological order of the two sub-frames.
  • the transmission power of the UL sub-frame with relatively low interference level may be (f+a) and the transmission power of the UL sub-frame with the relatively high interference level may be (f+2a).
  • the two UL sub-frames, which may be simultaneously scheduled, may belong to the same sub-frame set, the interference levels of the two sub-frames may be different. It may be beneficial to enhance the UL transmission performance by setting relatively large power adjustment value for the sub-frame with the relatively high interference level.
  • n may equal to 0 or 5.
  • the two sub-frames may belong to the same sub-frame set and the interference level of the sub-frame (n+4) (i.e., the sub-frame 4 or 9) is higher than that of the sub-frame (n+7)
  • the transmission power of the sub-frame (n+4) and the sub-frame (n+7) may respectively be (f+2a) and (f+a).
  • the two sub-frames may belong to the same sub-frame set and the interference level of the sub-frame (n+7) (i.e., the sub-frame 8 or 13) may be higher than that of the sub-frame (n+6), the transmission power of the sub-frame (n+6) and sub-frame (n+7) may respectively be (f+a) and (f+2a).
  • the interference level of each UL sub-frame may be different.
  • a UL sub-frame affected by relatively strong interference may need relatively large UL transmission power. Therefore, it may be more likely that the UL transmission power may reach the limitation of the maximum transmission power of the UE, which may affect the performance of the link.
  • an interference fluctuation range of the UL sub-frame affected by relatively strong interference may be relatively large and the performance for making up the change of the power with the closed-loop power control.
  • the interference situations of the two UL sub-frames may be different.
  • the eNB when the eNB simultaneously schedules the UL data transmission of two UL sub-frames and simultaneously triggers the report of the Aperiodic-Channel State Information (A-CSI), an A-CSI report may be regularly transmitted on one UL sub-frame which is placed in front of another UL sub-frame in chronological order, which may not be beneficial to ensure the transmission performance of the A-CSI.
  • A-CSI Aperiodic-Channel State Information
  • the A-CSI report may be transmitted on the UL sub-frame with relatively low interference level. Therefore, a problem that the transmission performance of the A-CSI may be reduced due to that the UL transmission power of the UE may reach to the maximum transmission power limitation and a problem that the performance may be reduced due to insufficient precision of the power control.
  • the first method may be that one of two sub-frames simultaneously scheduled by the UL Grant may be selected for transmitting the A-CSI according to the interference level. It may be selected that the A-CSI may be fed back on the UL sub-frame with the relatively low interference level to ensure a link performance of the A-CSI.
  • the two sub-frames are respectively a fixed UL sub-frame and a flexible UL sub-frame
  • the A-CSI may be sent on the fixed UL sub-frames.
  • the high-layer signaling may be used for configuring that the A-CSI may be transmitted with which UL sub-frame.
  • the A-CSI may be transmitted on a sub-frame, such as the UL sub-frame which is placed in front of another UL sub-frame in a chronological order.
  • the A-CSI may be transmitted on the sub-frame with the relatively low interference level.
  • the UL sub-frame for transmitting the A-CSI may be pre-defined.
  • the UL Grant transmitted on the sub-frame n In this example, n may equal to 0 or 5.
  • the A-CSI may be transmitted on the sub-frame (n+7) (i.e., the sub-frame 7 or 12).
  • the A-CSI may be adjustment of transmission power of the sub-frame (n+6) (i.e., the sub-frame 7 or 12).
  • the second method may be that according to the division of the UL sub-frame set, if the two UL sub-frames simultaneously scheduled by the UL Grant belong to different sub-frame sets, the A-CSI may be transmitted on the UL sub-frame of the sub-frame set with the relatively low interference level. Generally, the A-CSI may be transmitted on the UL sub-frame of the UL sub-frame set including the fixed UL sub-frame. If the two simultaneously-scheduled UL sub-frames belong to the same sub-frame set, the high-layer signaling may be used for configuring that the A-CSI may be transmitted by which UL sub-frame.
  • the A-CSI may be transmitted on a sub-frame, such as the UL sub-frame which is placed in front of another UL sub-frame in a chronological order.
  • the A-CSI may be transmitted on the sub-frame with the relatively low interference level.
  • the third method may be determining transmitting the A-CSI on which UL sub-frame with the UL index domain in the UL Grant.
  • the UL index domain may include 2 bits. At present, three code words of the UL index domain may be used for indicating the UL scheduling. Code word “10” and code word “01” may indicate that the UL transmission of only one UL sub-frame may be scheduled at present, code word “11” may indicate that the UL transmission of two UL sub-frames may be scheduled and code word “00” may not be used. In this method, two code words of the UL index may indicate that the data transmission of two UL sub-frames may be simultaneously scheduled. For instance, the code word “11” and code word “00” may indicate that the data transmission of two UL sub-frames may be simultaneously scheduled and the two code words may respectively indicate that the A-CSI may be transmitted on which UL sub-frame.
  • the UL index domain may be configured with a following method.
  • Code word “10” and code word “01” may be used for indicating that the UL transmission of only one UL sub-frame may be scheduled at present and the A-CSI may be transmitted on the scheduled UL sub-frame.
  • the code word “11” may indicate that the UL transmission of two UL sub-frames may be simultaneously scheduled and the A-CSI may be transmitted on the sub-frame (n+4).
  • the code word “00” may indicate that the UL transmission of the two sub-frames may be simultaneously scheduled and the A-CSI may be transmitted on the sub-frame (n+7).
  • table 7 may illustrate the configuration of the UL index domain of the UL Grant transmitted in the sub-frame 1 and the sub-frame 6.
  • the fourth method may be that the UL index domain in the UL Grant may be used for determining transmitting the A-CSI on the UL sub-frame of which sub-frame set.
  • the two code words of the UL index may be used for indicating that the data transmission of two UL sub-frames may be simultaneously scheduled. For instance, the code words “11” and “00” may indicate that the data transmission of two UL sub-frames may be simultaneously scheduled and the two code words may respectively indicate transmitting the A-CSI on the UL sub-frame of which sub-frame set.
  • the UL index may be configured with a following method.
  • Code word “10” and code word “01” may be used for indicating that the UL transmission of only one UL sub-frame may be scheduled at present and the A-CSI may be transmitted on the scheduled UL sub-frame.
  • the code word “11” may indicate that the UL transmission of two UL sub-frames may be simultaneously scheduled and the A-CSI may be transmitted on a UL sub-frame of the first sub-frame set.
  • the code word “00” may indicate that the UL transmission of the two sub-frames may be simultaneously scheduled and the A-CSI may be transmitted on a UL sub-frame of the second sub-frame set.
  • the high-layer signaling may be used for configuring transmitting the A-CSI on which UL sub-frame.
  • the A-CSI may be transmitted on a sub-frame, such as the UL sub-frame which is placed in front of another UL sub-frame in a chronological order.
  • the A-CSI may be transmitted on a sub-frame with relatively low interference level. Accordingly, table 9 may illustrate the configuration of the UL index domain of the UL Grant transmitted in the sub-frame 1 and the sub-frame 6.
  • Example one and example two may respectively describe indicating the UL sub-frame or sub-frame set, to which the TPC may be applied, with the UL index.
  • the UL index may indicate a technical scheme for transmitting the UL sub-frame or sub-frame set of the A-CSI.
  • the UL index also may indicate the scope, to which the TPC may be applied, and the UL resource occupied by the A-CSI.
  • Figure 4 is a flow chart illustrating another method for processing UL transmission in accordance with an example of the present disclosure. The method may include following blocks.
  • a UE may receive a UL reference UL and DL configuration configured by an eNB.
  • This example may mainly disclose a situation that the UL reference UL and DL configuration 0 may be configured.
  • the UE may receive a UL Grant from the eNB.
  • the UE may obtain a UL sub-frame currently scheduled by the eNB and an instruction of number of bits of HARQ-ACK information, which may need to be fed back, from a UL index domain.
  • the UE may transmit PUSCH and the HARQ-ACK information, length of which may be same as the number of the bits of the HARQ-ACK information.
  • a preferred example for transmitting the PUSCH and HARQ-ACK information based on the UL reference UL and DL configuration 0 may be described in the present disclosure.
  • a method for processing the HARQ-ACK information by the UE when the UE feeds back the HARQ-ACK on the PUSCH may be controlled by the eNB via configuring the DL DAI in the UL Grant.
  • the UL DAI may be a value, with which the UE may calculate number of bits of HARQ-ACK information needed to be fed back on the PUSCH resources.
  • the UL index may be transmitted in the UL Grant and the UL DAI may not be transmitted, resulting in that the UE only may determine the number of the bits of the HARQ-ACK information according to the maximum binding window and resources may be wasted.
  • the interference situations of the two UL sub-frames generally may be different.
  • a Physical Resource Block (PRB) resource allocation parameter and Modulation and Coding Scheme (MCS) parameter, etc. which may be respectively suitable for the two sub-frames, may be different in general, resulting in that the problem of performance degradation may exist when the UL transmission of two UL sub-frames is scheduled by one UL Grant.
  • PRB Physical Resource Block
  • MCS Modulation and Coding Scheme
  • the scheme of scheduling the UL transmission of two UL sub-frames with one UL Grant may not be supported. Therefore, in practice, two bits UL index may only be used for distinguishing that the currently-scheduled sub-frame may be one of the two UL sub-frames. In the preset disclosure, surplus ability of the two bits UL index may be further used for transmitting an instruction of number of bits of HARQ-ACK information, which may currently need to be fed back on the PUSCH.
  • the DL reference UL and DL configurations are a DL reference UL and DL configuration 5 and DL reference UL and DL configuration 2, in the method described hereinafter of the present disclosure, it may be taken into consideration first that valid UL DAI information may be provided when the DL reference UL and DL configuration 5 and the DL reference UL and DL configuration 2 are adopted.
  • the HARQ-ACK information may be fed back on the sub-frame 2.
  • the HARQ-ACK information may be fed back on the sub-frame 2 or the sub-frame 7. Therefore, when a using method of the UL index is defined in the following description of the present disclosure, it may be ensured first that the sub-frame 2 or the sub-frame 7 may indicate effective UL DAI information.
  • a scheduling sub-frame (n+4) may be indicated by a code word and the UL DAI information may need not to be transmitted. Specifically speaking, as for the DL reference UL and DL configurations 5 and 2, the sub-frame (n+4) may not be used for feeding back the HARQ-ACK and the UL DAI information may not be needed. If an index n of a sub-frame is 0 or 5, the scheduling sub-frame (n+7) may be indicated by three code words and the three code words may respectively indicate different information for determining the number of bits of the HARQ-ACK.
  • the scheduling sub-frame (n+7) may be indicated by one code word and the UL DAI information may not need to be transmitted. Specifically speaking, as for the DL reference UL and DL configurations 5 and 2, the sub-frame (n+7) may not be used for feeding back the HARQ-ACK and the UL DAI information may not be needed. If the index n of the sub-frame is 1 or 6, the scheduling sub-frame (n+6) may be indicated by three code words and the three code words may respectively indicate different information for determining the number of bits of the HARQ-ACK.
  • a method for using the three code words for determining the information of the number of bits of the HARQ-ACK may be described hereinafter.
  • a method for using the three code words may include that the three code words may respectively indicate that the number of bits of the HARQ-ACK may be determined according to a possible maximum binding window Mmax, determined according to a possible minimum binding window Mmin, or determined according to a binding window Mmid, the value of which is between the Mmax and the Mmin. Values of the Mmax, Mmin and Mmid may be determined according to the DL reference UL and DL configurations.
  • the DL reference UL and DL configuration is the DL reference UL and DL configuration 5
  • the Mmax may equal to 9
  • the Mmin may equal to 4
  • the Mmid may be larger than 4 and less than 9.
  • Mmin may equal to 6.
  • the DL reference UL and DL configuration is the DL reference UL and DL configuration 2, it may be configured that the Mmax may equal to 4, the Mmin may equal to 2 and the Mmid may equal to 3.
  • Another method for using the three code words may include that the three code words may indicate that values of the UL DAI may respectively be 1, 2 and 3 and the values of the UL DAI may determine the number of bits to be fed back on the PUSCH.
  • total number of a Physical Downlink Shared Channel (PDSCH) and a Physical Downlink Control Channel (PDCCH) indicating Semi-Persistent Scheduling (SPS) release received by a cell c on a UL sub-frame may be U c .
  • the value of the UL DAI may be W (Generally, the value of the UL DAI may be denoted with . For simple description, in the present disclosure may be expressed with W.)
  • size of a binding window determined by the cell c according to the DL reference UL and DL configuration may be M c .
  • the UE may calculate the total number of the to-be-fed back HARQ-ACK according to the PDSCH or the PDCCH indicating the SPS release transmitted on sub-frames.
  • table 10 may show an example that the UL index may be configured on the sub-frame 0 and 5. It may be assumed that the code words “10” and “01” of the UL index may respectively indicate that the UL data of the sub-frame (n+4) and the sub-frame (n+7) may be scheduled, so that backward compatibility may be maintained. Code words “11” and “00” of the UL index may indicate that the UL data of the sub-frame (n+7) may be scheduled. The code words “01”, “11” and “00” may respectively indicate that values of the UL DAI may be 1, 2 and 3 and indicate the information of the number of bits of the HARQ-ACK to be fed back on the PUSCH.
  • Table 11 may show an example that the UL index may be configured on the sub-frame 1 and sub-frame 6. It may be assumed that the code words “10” and “01” of the UL index may respectively indicate that the UL data of the sub-frame (n+6) and the sub-frame (n+7) may be scheduled, so that backward compatibility may be maintained. Code words “11” and “00” of the UL index may indicate that the UL data of the sub-frame (n+6) may be scheduled. The code words “01”, “11” and “00” may respectively indicate that values of the UL DAI may be 1, 2 and 3 and indicate the information of the number of bits of the HARQ-ACK to be fed back on the PUSCH.
  • the present disclosure may provide a corresponding device for processing UL transmission.
  • the structure of the device may be shown in figure 5 and the device may include a configuration module, a receiving module and a transmission module.
  • the configuration module may be configured to receive a UL reference UL and DL configuration and information of an interference level of a UL sub-frame.
  • the receiving module may be configured to receive a UL Grant.
  • the transmission module may determine a mode for transmitting a PUSCH and/or A-CSI according to an interference level of the UL sub-frame.
  • the configuration module may be configured to receive a UL reference UL and DL configuration.
  • the receiving module may be configured to receive the UL Grant, obtain the UL sub-frame currently scheduled by an eNB and an instruction of number of bits of the to-be-fed back HARQ-ACK information from the UL index domain.
  • the transmission module may be configured to transmit the PUSCH and the HARQ-ACK information, the length of which may be the number of the bits.
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