WO2013191511A1 - A method and an apparatus for uplink scheduling in wireless communication system - Google Patents

A method and an apparatus for uplink scheduling in wireless communication system Download PDF

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Publication number
WO2013191511A1
WO2013191511A1 PCT/KR2013/005512 KR2013005512W WO2013191511A1 WO 2013191511 A1 WO2013191511 A1 WO 2013191511A1 KR 2013005512 W KR2013005512 W KR 2013005512W WO 2013191511 A1 WO2013191511 A1 WO 2013191511A1
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WIPO (PCT)
Prior art keywords
pusch
uplink
rtt
tdd
group
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PCT/KR2013/005512
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English (en)
French (fr)
Inventor
Shichang Zhang
Chengjun Sun
Yingyang Li
Jingxing Fu
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Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from CN2012102123172A external-priority patent/CN103313380A/zh
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to EP13807504.9A priority Critical patent/EP2865123A4/en
Priority to US14/410,247 priority patent/US20150327229A1/en
Publication of WO2013191511A1 publication Critical patent/WO2013191511A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements

Definitions

  • the present invention relates to mobile communication field, in particular, to the method and device for uplink scheduling.
  • FIG.1 is the schematic diagram of the frame structure in TDD system of LTE.
  • the length of every radio frame(100) is 10ms, equally divided into two half-frame(101)s of 5ms, each comprising 8 time slots of 0.5ms and 3 special fields of total length of 1ms.
  • the 3 special fields are respectively downlink pilot time slot (DwPTS, 111), guard period(GP, 113) and uplink pilot time slot (UpPTS, 115), and each sub-frame consists of two continuous time slots.
  • a TDD system there are transmissions from eNBs to user equipments (UE) (referred as downlink) and the ones from user equipments to eNBs (referred to as uplink).
  • UE user equipments
  • uplink the sub-frame configured to uplink
  • uplink sub-frame the sub-frame configured to downlink
  • downlink sub-frame the sub-frame configured to downlink as downlink sub-frame.
  • a TDD system supports seven types of uplink and downlink configurations, as shown in FIG.1, D represents downlink sub-frame, U represents uplink sub-frame, and S represents the special sub-frame(110) containing 3 special fields.
  • the TDD system of LTE supports HARQ mechanism, and its principle comprises: eNB allocating uplink resource to UE; UE sending uplink data to eNB using uplink resources; eNB receiving uplink data by and sending HARQ indication to UE, UE retransmitting uplink and downlink data based on the indication.
  • UE carries uplink data via PUSCH
  • eNB carries the PUSCH scheduling and control information via physical downlink control channel(PDCCH, Physical Downlink Control Channel), namely uplink grant (UL grant), eNB retransmits the indication carried by HARQ via physical hybrid retransmission indicator channel.
  • PDCCH Physical Downlink Control Channel
  • the timing position and subsequent retransmition timing position in one transmission of PUSCH are determined based on predefined timing relations, including the timing relations from UL Grant to PUSCH, from PHICH to PUSCH, and from PUSCH to PHICH, which hereinafter collectively referred to as synchronous HARQ timing relation of PUSCH.
  • UE receives UL grant in downlink sub-frame n(n is the index of sub-frame, similarly hereinafter), this UL grant is used to control the PUSCH in uplink sub-frame n+k, where the value of k is defined in Table 2.
  • the number of uplink sub-frames is less than or equal to that of downlink sub-frames (frame S can be used as downlink sub-frame).
  • the unique timing relation of synchronous HARQ of PUSCH can be configured via a unique k, as shown in Table 2.
  • PUSCH in one downlink sub-frame is not scheduled, or PUSCH in one uplink sub-frame can only be scheduled.
  • the number of uplink sub-frames is greater than that of downlink sub-frames.
  • PDCCH in each downlink sub-frame needs to schedule the PUSCH in two uplink sub-frames, to this end, k is not unique. Uplink index is used in PDCCH to schedule the PUSCH in two uplink sub-frames, and different k is used for PUSCH with different indexes.
  • PHICH resource set is dependently allocated for PUSCH in uplink sub-frame in LTE and LTE-A. Assuming that UE received PHICH in downlink sub-frame n, this PHICH is then used to control PUSCH in uplink sub-frame n+j, where j is defined in Table 2. Specifically, for TDD UL/DL configurations 1-6, the number of uplink sub-frames is less than or equal to that of downlink sub-frames. For any one of downlink sub-frame n, the unique timing relation of synchronous HARQ of PUSCH can be configured via a unique j, as shown in Table 2.
  • Different PHICH resource sets can be configured in one downlink sub-frame, or only PHICH resource set in uplink sub-frame can be configured.
  • the number of uplink sub-frames is greater than that of downlink sub-frames, and j is not unique.
  • Two PHICH resource sets are configured in downlink sub-frames 0 and 5, namely PHICH resource 0 and PHICH resource 1, and for different PHICH resource, different j is used. For example, when UE received PHICH in downlink sub-frame 0, PUSCH in uplink sub-frame 4 and/or uplink sub-frame 7 can be triggered.
  • LTE-A advanced LTE technology
  • dynamic TDD technology i.e., configuring the UL/DL in TDD via physical layer signaling
  • the proportion of uplink sub-frame and downlink sub-frame conforms to that of uplink throughput and downlink throughput, facilitating the rise in UL/DL peak rate and system throughput.
  • TDD UL/DL configuration in a cell dynamically changes with the current UL/DL throughputs.
  • UE obtains the UL/DL configuration in the cell through broadcast system information, and further obtains synchronous HARQ timing relation of PUSCH based on Tables 2 and 3 by using TDD configuration an index.
  • the short refreshing period of system information is 640ms.
  • the present invention has been made to solve the above-mentioned problems occurring in the prior art, and the present invention provides a method and an apparatus for performing an uplink scheduling in a wireless communication system.
  • a method for performing an uplink scheduling by an evolved Node B (eNB) in a wireless communication system comprises sending signaling information to a User Equipment (UE), the signaling information including synchronous Hybrid Automatic Repeat request (HARQ) timing information of Physical Uplink Shared Channel(PUSCH), wherein the synchronous HARQ timing information is determined based on information of grouping of uplink and downlink configurations, and receiving PUSCH information sent by the UE.
  • UE User Equipment
  • HARQ Hybrid Automatic Repeat request
  • a method for performing an uplink scheduling by a User Equipment (UE) in a wireless communication system comprises receiving signaling information sent by an evolved Node B (eNB), the signaling information including synchronous Hybrid Automatic Repeat request (HARQ) timing information of Physical Uplink Shared Channel (PUSCH), wherein the synchronous HARQ timing information is determined based on information of grouping of uplink and downlink configurations, and sending PUSCH information to the eNB.
  • eNB evolved Node B
  • HARQ Hybrid Automatic Repeat request
  • PUSCH Physical Uplink Shared Channel
  • an evolved Node B for performing an uplink scheduling in a wireless communication system
  • the eNB comprises a transceiver for transmitting/receiving data over a wireless network, and a controller for controlling operations of sending signaling information to a User Equipment (UE), the signaling information including synchronous Hybrid Automatic Repeat request (HARQ) timing information of Physical Uplink Shared Channel(PUSCH), wherein the synchronous HARQ timing information is determined based on information of grouping of uplink and downlink configurations, and receiving PUSCH information sent by the UE.
  • UE User Equipment
  • HARQ Hybrid Automatic Repeat request
  • a User Equipment for performing an uplink scheduling in a wireless communication system
  • the UE comprises a transceiver for transmitting/receiving data over a wireless network, and a controller for controlling operations of receiving signaling information sent by an evolved Node B (eNB), the signaling information including synchronous Hybrid Automatic Repeat request (HARQ) timing information of Physical Uplink Shared Channel (PUSCH), wherein the synchronous HARQ timing information is determined based on information of grouping of uplink and downlink configurations, and sending PUSCH information to the eNB.
  • eNB evolved Node B
  • HARQ Hybrid Automatic Repeat request
  • PUSCH Physical Uplink Shared Channel
  • 7 TDD UL/DL configurations are grouped based on the period of round trip time (RTT) of PUSCH or other criteria.
  • eNB schedules PUSCH via signaling, and meantime indicates the current grouping information to UE;
  • UE determines the scheduled synchronous HARQ timing relation of PUSCH with reference to synchronous HARQ timing relation of PUSCH of TDD UL/DL configurations in the group.
  • the information of existing 7 UL/DL configurations after being grouped by the present invention is only to indicate to UE synchronous HARQ timing relation of PUSCH, not to limit UL/DL sub-frames working in the current system.
  • UE acquires the information about the scheduling of PUSCH and grouping of current TDD UL/DL configurations by the signaling sent by eNB, even if the UL/DL sub-frames of TDD UL/DL configurations current in the system are different than that of any of the groups, UE is able to determine synchronous HARQ timing relation of PUSCH being scheduled based on synchronous HARQ timing relation of PUSCH of TDD UL/DL configurations in the group and the method of present invention.
  • the transmission of PUSCH in a dynamic TDD system can effectively regulated, and UE can identify the group of current configurations by receiving signaling, whereby determine synchronous HARQ timing relation of PUSCH being scheduled.
  • the solution of the present invention can achieve the scheduling of PUSCH in a dynamic TDD system with minor modification of the system. Furthermore, the above mentioned solution of the present invention has minimum change to the existing system, will not compromise the compatibility of the system, and is efficient and easy to achieve.
  • FIG. 1 is the schematic drawing of the frame structure of a TDD system of LTE
  • FIG. 2 is the flowchart of uplink scheduling method in the network side of the embodiment of the present invention.
  • FIG.3 is the schematic drawings of the uplink scheduling method in the UE side of the embodiment of the present invention.
  • FIG. 4 is the schematic drawing 1 of synchronous HARQ timing relation of PUSCH determined by the bit value of UL-Index or UL-DAI in UL-Grant and the position of UL-Grant;
  • FIG.5 is the schematic drawing 2 of synchronous HARQ timing relation of PUSCH determined by the bit value of UL-Index or UL-DAI in UL-Grant and the position of UL-Grant;
  • FIG.6 is the schematic drawing of synchronous HARQ timing relation of PUSCH determined by the position of UL-Grant
  • FIG.7 is the schematic drawing of synchronous HARQ timing relation scheduling of PUSCH obtained by modifying TDD UL/DL configuration 0.
  • the present invention mainly relates to a dynamic TDD scene.
  • TDD UL/DL configurations can be dynamically changed via controlling signaling of physical layers as the UL/DL throughputs in a cell dynamically change.
  • the shortest refresh period is 640ms and the switching period of TDD configuration is very long by using the method of informing the changes in UE UL/DL configurations via system messages, then obtaining synchronous HARQ timing relation of PUSCH.
  • the embodiment of the present invention provides an uplink scheduling method, as shown in FIG.2, including the following steps:
  • eNB sends signaling information to UE, said signaling information including synchronous HARQ timing information of PUSCH, wherein said timing information is determined based on the information of groups of UL/DL configurations.
  • eNB sends signaling information to a UE, said signaling information including synchronous HARQ timing information of physical uplink shared channel (PUSCH), wherein said timing information is determined based on the information of groups of UL/DL configurations.
  • PUSCH physical uplink shared channel
  • the grouping of UL/DL configurations include grouping the UL/DL configurations based on the features of TDD UL/DL configurations, particularly the period of PUSCH Round Trip Time(PUSCH RTT). Therefore, UL/DL configurations can be reasonably grouped or combined as needed.
  • the examples of the groups in the following are only part of the implementations.
  • UL/DL configuration groups include any one of the following options:
  • Option A based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configurations 0 and 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Option B based on the period of Round Trip Time (RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, second group of TDD UL/DL configuration 0 with RTT not being 10ms; and third group of TDD UL/DL configuration 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Option C based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 0 with RTT not being 10ms.
  • RTT Round Trip Time
  • Option D based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 6 with RTT not being 10ms.
  • RTT Round Trip Time
  • eNB indicates the information of groups based on predefined grouping method and the bit values of UL-Index or UL-DAI in UL-Grant in respective sub-frames. For example, in the Option C, eNB indicates the information of groups via the bit values of UL-Index or UL-DAI in UL-Grant in sub-frames 0, 1 and 6.
  • eNB is also able to indicate the information of groups with 2 bits in TPC command in DCI format 0 or with additional 2 bits in DCI 0.
  • eNB receives PUSCH information sent by UE based on the timing information.
  • eNB receives PUSCH information sent by UE based on the timing information.
  • the embodiment of the present invention also provides an uplink scheduling method in the terminal side, including the following steps:
  • UE receives signaling information sent by eNB, said signaling information including synchronous HARQ timing information of PUSCH, wherein said timing information is determined based on the information of groups of UL/DL configurations.
  • UE receives the signaling information sent by eNB, said signaling information including synchronous HARQ timing information of physical uplink shared channel(PUSCH), wherein said timing information is determined based on the information of groups of UL/DL configurations;
  • PUSCH physical uplink shared channel
  • the grouping of UL/DL configurations include grouping the UL/DL configurations based on the period of PUSCH Round Trip Time (PUSCH RTT) of TDD UL/DL configurations. Therefore, UL/DL configurations can be reasonably grouped or combined as needed.
  • PUSCH RTT Round Trip Time
  • UL/DL configuration groups include any one of the following options:
  • Option A based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configurations 0 and 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Option B based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, second group of TDD UL/DL configuration 0 with RTT not being 10ms; and third group of TDD UL/DL configuration 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Option C based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 0 with RTT not being 10ms.
  • RTT Round Trip Time
  • Option D based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 6 with RTT not being 10ms.
  • RTT Round Trip Time
  • UE receives the signaling information sent by eNB, and determines the current information of groups based on predefined grouping method and the bit values of UL-Index or UL-DAI in UL-Grant in respective sub-frames. For example, in the Option C, UE determines the group to which current uplink HARQ process belongs by the bit values of UL-Index or UL-DAI in UL-Grant in sub-frames 0, 1 and 6:
  • UE receives the information sent by eNB, and is also able to indicate the information of groups with 2 bits in TPC command in DCI format 0 or with additional 2 bits in DCI format 0.
  • UE sends PUSCH information to eNB based on the timing information.
  • UE sends PUSCH information to eNB based on the timing information.
  • the embodiment of the present invention also provides a eNB, including a transceiver comprising a transmitting module and a receiving module.
  • the eNB can be configured to comprise a transceiver for transmitting/receiving data over a wireless network, and a controller for performing functions of the transmitting module and the receiving module by using the transceiver.
  • the transmitting module is used to send signaling information to the terminal UE, said signaling information including synchronous HARQ timing information of physical uplink shared channel(PUSCH), wherein said timing information is determined based on the information of groups of UL/DL configurations.
  • PUSCH physical uplink shared channel
  • the grouping of UL/DL configurations include grouping the UL/DL configurations based on the period of PUSCH Round Trip Time(PUSCH RTT).
  • UL/DL configuration groups include any one of the following options:
  • Option A based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configurations 0 and 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Option B based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, second group of TDD UL/DL configuration 0 with RTT not being 10ms; and third group of TDD UL/DL configuration 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Option C based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 0 with RTT not being 10ms.
  • RTT Round Trip Time
  • Option D based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 6 with RTT not being 10ms.
  • RTT Round Trip Time
  • transmitting module 110 indicates the information of groups based on predefined grouping method and the bit values of UL-Index or UL-DAI in UL-Grant in respective sub-frames. For example, in the Options A, B or C, transmitting module 110 indicates the information of groups via the bit values of UL-Index or UL-DAI in UL-Grant in sub-frames 0, 1 and 6:
  • the transmitting module in the eNB indicates the information of groups with 2 bits in TPC command in DCI format 0 or with additional 2 bits in DCI format 0.
  • the receiving module in the eNB is used to receive PUSCH information sent by UE based on the timing information.
  • the embodiment of the present invention also provides a UE, including a transceiver comprising a receiving module and a transmitting module.
  • the UE can be configured to comprise a transceiver for transmitting/receiving data over a wireless network, and a controller for performing functions of the transmitting module and the receiving module by using the transceiver.
  • the receiving module in the UE is used to receive signaling information sent by the eNB, said signaling information including synchronous HARQ timing information of physical uplink shared channel(PUSCH), wherein said timing information is determined based on the information of groups of UL/DL configurations.
  • PUSCH physical uplink shared channel
  • the grouping of UL/DL configurations include grouping the UL/DL configurations based on the period of PUSCH Round Trip Time(PUSCH RTT).
  • UL/DL configuration groups include any one of the following options:
  • Option A based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configurations 0 and 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Option B based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, second group of TDD UL/DL configuration 0 with RTT not being 10ms; and third group of TDD UL/DL configuration 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Option C based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 0 with RTT not being 10ms.
  • RTT Round Trip Time
  • Option D based on the period of Round Trip Time(RTT) of PUSCH, grouping the 7 TDD UL/DL configurations in LTE and LTE-A into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 6 with RTT not being 10ms.
  • RTT Round Trip Time
  • receiving module 210 receives the signaling information sent by eNB, and determines the information of groups based on predefined grouping method and the bit values of UL-Index or UL-DAI in UL-Grant in respective sub-frames. For example, in the Options A, B or C, receiving module 210 receives UL-Grant in sub-frames 0, 1 and 6, determines the group to which current uplink HARQ process belongs by the bit values of UL-Index or UL-DAI in UL-Grant:
  • the receiving module receives the information sent by eNB, and determines the information of groups with 2 bits in TPC command in DCI format 0 or with additional 2 bits in DCI format 0.
  • the transmitting module is used to send PUSCH information to eNB based on the timing information.
  • the transmission of PUSCH in a dynamic TDD system can be effectively regulated, and UE can identify the group of current configurations by receiving signaling, whereby determine synchronous HARQ timing relation of PUSCH being scheduled.
  • the solutions of the present invention can achieve the scheduling of PUSCH in a dynamic TDD system with minor modification of the system. Furthermore, the above mentioned solutions of the present invention have minimum changes to the existing system, will not compromise the compatibility of the system, and are efficient and easy to achieve.
  • Step 301 grouping 7 TDD UL/DL configurations in LTE and LTE-A into different groups to determine synchronous HARQ timing information of PUSCH;
  • Step 302 UE identifies which group the current configurations belong to after receiving the signaling sent by eNB, and acquires synchronous HARQ timing relation of PUSCH based on this grouping information;
  • Step 303 UE sends PUSCH, and receives PHICH based on the timing relation of PUSCH determined by Step 302.
  • Step 301 Implementation 1 of grouping the 7 TDD UL/DL configurations in LTE and LTE-A into different groups is to group into two groups based on the period of Round Trip Time(RTT) of PUSCH being 10ms or not, that is, grouping into one group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and another group of TDD UL/DL configurations 0 and 6 with RTT not being 10ms;
  • RTT Round Trip Time
  • Step 301 Implementation 2 of grouping the 7 TDD UL/DL configurations in LTE and LTE-A into different groups is to group based on the period of Round Trip Time(RTT) of PUSCH, that is, grouping into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, second group of TDD UL/DL configuration 0; and third group of TDD UL/DL configuration 6;
  • RTT Round Trip Time
  • Step 301 Implementation 3 of grouping the 7 TDD UL/DL configurations in LTE and LTE-A into different groups is to group them into two groups, that is, grouping into first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, second group of TDD UL/DL configuration 0.
  • the system is not able to dynamically set TDD UL/DL configuration to TDD UL/DL configuration 6.
  • Said dynamic TDD UL/DL configurations mean to configure them via physical layer signaling.
  • Step 301 Implementation 4 of grouping the 7 TDD UL/DL configurations in LTE and LTE-A into different groups is to group them into two groups, that is, the first group of TDD UL/DL configurations 1, 2, 3, 4 and 5 with 10ms of RTT, and second group of TDD UL/DL configuration 6.
  • the system is not able to dynamically set TDD UL/DL configuration to TDD UL/DL configuration 6.
  • Step 302 UE determine which group current configurations belong to by the received position of UL-Grant or bit values of UL-Index or UL-DAI in UL-Grant or combination thereof;
  • Step 302 Another implementation of Step 302 is to indicate which group current configurations belong to by defining new downlink control information(DCI) format or adding new bits in existing UL-Grant format;
  • DCI downlink control information
  • Step 302 Another implementation of Step 302 is to indicate which group current configurations belong to by redefining some fields or padding bits in the existing DCI format, and others.
  • UE can determine synchronous HARQ timing relation of PUSCH based on the signaling position sent by eNB, for example, the position of UL-Grant, since the position of each UL-Grant has same position separation as that of PUSCH being scheduled.
  • UE needs to determine whether to allocate configuration 0 or 6 based on a certain scheme, then determine to use synchronous HARQ timing relation of PUSCH of configuration 0 or 6.
  • Said scheme has some connection with the method in step 301, and UE will determine to allocate configuration 0 or 6 according to this grouping method and the signaling sent by eNB. For example, if Option C is used, UE received the information indicating the second group, i.e., the group of configuration 0, UE will determine that it is configuration 0.
  • the method according to the present invention is implemented as follows as an application scene 1:
  • TDD UL/DL configuration 0 is used rather than configuration 6, since uplink/downlink ratio of configuration 6 can be obtained by averaging configuration 0 and other configurations with high downlink/uplink radio in time.
  • UE detects PDCCH with UL-Grant in all downlink sub-frames possibly having UL-Grant.
  • synchronous HARQ timing relation of PUSCH being scheduled is determined based on the bit values of UL-Index or UL-DAI in UL-Grant and the position of UL-Grant; and if UL-Grant is detected to be sub-frames other than sub-frames 0, 1, or 6, then synchronous HARQ timing relation of PUSCH being scheduled is determined based on the position of UL-Grant in the sub-frame.
  • Step 401 configurations 0, 1, 2, 3, 4 and 5 in 7 TDD UL/DL configurations defined in LTE and LTE-A are grouped in Option C, that is:
  • Group 1 TDD UL/DL configuration 0;
  • Group 2 TDD UL/DL configurations 1, 2, 3, 4 and 5;
  • Step 402 Detecting PDCCH in all sub-frames possibly having uplink scheduling, and acquires UL-Grant, wherein, the sub-frames possibly having uplink scheduling mean sub-frames #0,#1,#3,#4,#5,#6,#8 and #9.
  • synchronous HARQ timing relation of PUSCH being scheduled is determined based on the bit values of UL-Index or UL-DAI in UL-Grant and the position of UL-Grant; and if UL-Grant is in the sub-frames other than sub-frames #0,#1 and #6, that is, sub-frames #3, #4, #5, #8 or #9, then synchronous HARQ timing relation of PUSCH being scheduled is determined based on the position of UL-Grant in the sub-frames, with following specific steps:
  • mapping relation table from UL-Grant/PHICH to PUSCH of group 2 is obtained by merging the parts of group 2 in Table 2, as shown in FIG. 4;
  • Table 4 the separation k from UL-Grant/PHICH sub-frame to PUSCH sub-frame of group 2
  • TDD UL/DL configuration is group 2, that is, TDD UL/DL configurations 1, 2 ,3, 4 or 5;
  • TDD UL/DL configuration is group 1, that is, TDD UL/DL configuration 0; above three bit values have same definitions as in LTE and LTE-A, indicating that the uplink sub-frames is being scheduled;
  • the definition of synchronous HARQ timing relation of PUSCH is the same as that of configuration 0 in LTE and LTE-A, as shown in configuration 0 in Tables 2 and 3 in the Background part.
  • the scheduled PUSCH is transmitted in sub-frame n+k, and synchronous transmission of HARQ is carried in 10ms of HARQ RTT, that is to say, PHICH is received in sub-frame n+10.
  • UE will transmit the mth non-adaptive retransmission in sub-frame n+10 ⁇ m+k, and receive PHICH in the mth retransmissions in sub-frame n+10 ⁇ (m+1), here, k is as in FIG.4, 1 ⁇ m ⁇ M, M is the maximum retransmission number defined by the system.
  • Step 403 the terminal sends PUSCH, and receives PHICH based on synchronous HARQ timing relation of PUSCH defined in Step 302.
  • it can be a same HARQ process or different ones in which PUSCH is changed before and after the configuring of TDD according to the method of the present invention.
  • UE determines that the TDD UL/DL configuration is group 2, and will send PUSCH in sub-frame (6+6), i.e., the sub-frame #2 of next frame based on Table 4, and receives PHICH in sub-frame (6+10). If PHICH gives NACK back, then the first retransmission will be sent in sub-frame (6+10+6), and so on, as shown in FIG. 4.
  • UE determines that the TDD UL/DL configuration is group 1, and will send PUSCH and receive PHICH based on synchronous HARQ timing relation of PUSCH of configuration 0 in LET and LET-A, as shown in FIG. 5.
  • UE determines that the TDD UL/DL configuration is group 2, and will send PUSCH in sub-frame (8+4), and receives PHICH in sub-frame (8+10) based on Table 4. If PHICH gives NACK back, then the first retransmission will be sent in sub-frame (8+10+4), and so on, as shown in FIG. 6.
  • the 7 TDD UL/DL configurations defined in LTE and LTE-A are grouped in Option A, and the groups are determined based on the position of UL-Grant or the bit value of UL-Index or UL-DAI in UL-Grant or the combination thereof. If PUSCH RTT period with being not 10ms and configuration 6 are used, the PUSCH of configuration 6 is scheduled by synchronous HARQ timing relation of configuration 0, and PUSCH will not be scheduled to sub-frame 9, particularly as follows:
  • Step 501 grouping in Option A, that is:
  • Group 1 TDD UL/DL configurations 0 and 6;
  • Group 2 TDD UL/DL configurations 1, 2, 3, 4 and 5;
  • Step 502 the groups are determined according to the method of scene 1.
  • the timing relation from UL-Grant or PHICH to PUSCH is the same as the configuration 0 in LTE and LTE-A, as shown in sub-frames 0, 1, 5 and 6 of configuration 0 of Table 2 in the Background part.
  • this PHICH is considered as the ACK/NACK indication of PUSCH of the sub-frame 9 of last frame, and will send the scheduled PUSCH in sub-frame 2 of next frame. If UE did not send PUSCH in sub-frame 9 of last frame, this PHICH is considered as the ACK/NACK indication of PUSCH of the sub-frame 8 of last frame, and will send the scheduled PUSCH in sub-frame 2 of next frame;
  • NDI New Data Indication
  • timing relations from PUSCH to PHICH of all uplink sub-frames are the same as that of configuration 0 in LTE and LTE-A, as shown in configuration 0 in Table 2 of Background part.
  • UE should keep listening to PDCCH in sub-frame 9;
  • TDD UL/DL configuration 6 I PHICH of PHICH of uplink sub-frame 8 of last frame, which is present in sub-frame 5 by eNB has to be set to 1, and UL-Index of UL-Grant uplink sub-frame 8 of last frame, which is sent in sub-frame 5 has to be set to “00”.
  • eNB can send downlink data in sub-frame 9.
  • Step 503 the same as Step 403 in application scene 1.
  • UE detects the “01” of UL-Index of UL-Grant in sub-frame 1, then UE sends PUSCH based on the timing relation from UL-Grant to PUSCH of TDD UL/DL configuration 0.
  • I PHICH can only equal to “1”, and this PUSCH will be scheduled to sub-frame 2 in the next frame, as shown in FIG. 7.
  • Step 601 grouping in Option B, that is:
  • Group1 TDD UL/DL configuration 0;
  • Group3 TDD UL/DL configurations 1, 2, 3, 4 and 5;
  • Step 602 a new DCI format is defined based on DCI format 0 in LTE and LTE-A, adding two bits on all DCI format 0(hereinafter referred as new bits).
  • the groups are indicated by the values of new bits, for example, “00” indicates group 1, “01” indicates group 2, “10” indicates group 3.
  • the current grouping is determined by the bit value of the newly defined DCI. If it’s group 1 or 2, synchronous HARQ timing relation of PUSCH is the same as that of TDD UL/DL configuration 0 or 6 in LTE and LTE-A. If it’s group 3, synchronous HARQ timing relation of PUSCH is determined in the same way as the Group 2 in application scene.
  • Step 603 the same as Step 403 in application scene 1.
  • UE detects PDCCH with UL-Grant in downlink sub-frames possibly having UL-Grant. If UL-Grant is in sub-frames #0, #1, #5, #6 and #9, then synchronous HARQ timing relation of PUSCH being scheduled is determined based on bit value of TPC in UL-Grant and the position of UL-Grant, and if in other sub-frames, it is determined based on the sub-frame position of UL-Grant, with specific steps as follows:
  • Step 701 grouping in Option B, that is:
  • Group1 TDD UL/DL configuration 0;
  • Group3 TDD UL/DL configurations 1, 2, 3, 4 and 5.
  • Step 702 UE detects PDCCH in the sub-frames possibly in uplink scheduling to acquire UL-Grant, here the possible sub-frames in uplink scheduling means #0, #1, #3, #4, #5, #6, #8 and #9. If UL-Grant is in sub-frames #0, #1, #5, #6 and #9, then synchronous HARQ timing relation of PUSCH being scheduled is determined based on bit value of TPC in UL-Grant and the position of UL-Grant, and if in other sub-frames, i.e., #3, #4 or #8, it is determined based on the sub-frame position of UL-Grant, with specific steps as follows:
  • synchronous HARQ timing relation of PUSCH is same as that of configuration 0 in LTE and LTE-A, as shown in configurations 0 and 6 in Tables 2 and 3 in Background part.
  • the PUSCH being scheduled is sent in sub-frame n+k, and synchronous transmission of HARQ is carried in 10ms of HARQ RTT, that is to say, PHICH is received in sub-frame n+10.
  • UE will transmit the mth non-adaptive retransmission in sub-frame n+10 ⁇ m+k, and receive PHICH in the mth retransmissions in sub-frame n+10 ⁇ (m+1), here, k is as in Table.4, 1 ⁇ m ⁇ M, M is the maximum retransmission number defined by the system.
  • Step 703 same as Step 403 in application scene 1.
  • configuration 6 is used in PUSCH RTT period of not being 10ms for backwards compatibility of the system.
  • UE detects PDCCH with UL-Grant in downlink sub-frames possibly having UL-Grant. If UL-Grant is in sub-frames #0, #1, #6 and #9, then synchronous HARQ timing relation of PUSCH being scheduled is determined based on bit value of UL-DAI in UL-Grant and the position of UL-Grant, and if in other sub-frames, it is determined based on the sub-frame position of UL-Grant, with specific steps as follows:
  • Step 801 grouping in Option D, that is:
  • Group1 TDD UL/DL configuration 6;
  • Group3 TDD UL/DL configurations 1, 2, 3, 4 and 5.
  • Step 802 UE detects PDCCH in the sub-frames possibly in uplink scheduling to acquire UL-Grant, here the possible sub-frames in uplink scheduling means #0, #1, #3, #4, #5, #6, #8 and #9. If UL-Grant is in sub-frames #0, #1, #6 and #9, then synchronous HARQ timing relation of PUSCH being scheduled is determined based on bit value of UL-DAI in UL-Grant and the position of UL-Grant, and if in other sub-frames, i.e., #3, #4, #5 or #8, it is determined based on the sub-frame position of UL-Grant, with specific steps as follow:
  • bit value of UL-DAI is “00”, “01” or “10”, then it’s Group 2, i.e., TDD UL/DL configurations 1, 2, 3, 4 or 5; above three bit values have same definitions as in LTE and LTE-A, indicating the number of downlink sub-frames being scheduled in the downlink sub-frames bound with the uplink sub-frames being scheduled; these three bits have specific values:
  • bit value of UL-DAI is “11”, then it’s Group 1, i.e., TDD UL/DL configuration 6.
  • synchronous HARQ timing relation of PUSCH is same as that of configuration 6 in LTE and LTE-A, as shown in configuration 0 in Tables 2 and 3 in Background part.
  • Group 2 If UE detects UL-Grant in sub-frame n, the PUSCH being scheduled is sent in sub-frame n+k, and synchronous transmission of HARQ is carried in 10ms of HARQ RTT, that is to say, PHICH is received in sub-frame n+10.
  • UE will transmit the mth non-adaptive retransmission in sub-frame n+10 ⁇ m+k, and receive PHICH in the mth retransmissions in sub-frame n+10 ⁇ (m+1), here, k is as in Table.4, 1 ⁇ m ⁇ M, M is the maximum retransmission number defined by the system.
  • Step 803 same as Step 403 in application scene 1.
  • Step 901 grouping in Option D, that is:
  • Group1 TDD UL/DL configuration 6;
  • Group3 TDD UL/DL configurations 1, 2, 3, 4 and 5.
  • Step 902 a new DCI format is defined based on DCI 0 in LTE and LTE-A, adding 1 bit on all DCI 0(hereinafter referred as new bit).
  • the groups are indicated by the values of the new bit, for example, “0” indicates group 1, “1” indicates group 2. Or the DCI format in application scene remains, adding two bits on all DCI 0(hereinafter referred as new bit).
  • the groups are indicated by the values of new bits, for example, “00” indicates group 1, “11” indicates group 2.
  • the current grouping is determined by the bit value of the new bits in the newly defined DCI. If it’s group 1, synchronous HARQ timing relation of PUSCH is the same as that of TDD UL/DL configuration 6 in LTE and LTE-A. If it’s group 2, synchronous HARQ timing relation of PUSCH is determined in the same way as the Group 2 in application scene 1.
  • Step 903 same as Step 403 in application scene 1.
  • 7 TDD UL/DL configurations are grouped based on the period of round trip time(RTT) of PUSCH or other criteria.
  • eNB schedules PUSCH via signaling, and meantime indicates the current grouping information to UE;
  • UE determines the scheduled synchronous HARQ timing relation of PUSCH with reference to synchronous HARQ timing relation of PUSCH of TDD UL/DL configurations in the group.
  • the grouping information of existing 7 UL/DL configurations is only to indicate to UE synchronous HARQ timing relation of PUSCH, not to limit UL/DL sub-frames working in the current system.
  • UE acquires the information about the scheduling of PUSCH and grouping of current TDD UL/DL configurations by the signaling sent by eNB, even if the UL/DL sub-frames of TDD UL/DL configurations current in the system are different than that of any of the groups, UE is able to determine synchronous HARQ timing relation of PUSCH scheduled based on synchronous HARQ timing relation of PUSCH of TDD UL/DL configurations in the group and the method of present invention.
  • individual functional units in various embodiments of the present invention may be integrated in processing module, or physically present as single unit, or populated into a single module via two or more units.
  • integrated modules may be implemented either by in hardware or in the software function module.
  • Said integrated module, when embodied as software function module and sold or used as independent products, may be stored in a computer readable storage medium.
  • the above mentioned storage medium may be ROM, disk or CDs, etc..

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PCT/KR2013/005512 2012-03-16 2013-06-21 A method and an apparatus for uplink scheduling in wireless communication system WO2013191511A1 (en)

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