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WO2016105173A1 - Procédé et appareil de transmission de demande automatique de répétition hybride - Google Patents

Procédé et appareil de transmission de demande automatique de répétition hybride Download PDF

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Publication number
WO2016105173A1
WO2016105173A1 PCT/KR2015/014324 KR2015014324W WO2016105173A1 WO 2016105173 A1 WO2016105173 A1 WO 2016105173A1 KR 2015014324 W KR2015014324 W KR 2015014324W WO 2016105173 A1 WO2016105173 A1 WO 2016105173A1
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WIPO (PCT)
Prior art keywords
harq
vcc
transmission
ccs
component carriers
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2015/014324
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English (en)
Inventor
Yingyang Li
Yi Wang
Chengjun Sun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Samsung Telecom R&D Center
Samsung Electronics Co Ltd
Original Assignee
Beijing Samsung Telecom R&D Center
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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Publication date
Priority claimed from CN201510680469.9A external-priority patent/CN105743619B/zh
Application filed by Beijing Samsung Telecom R&D Center, Samsung Electronics Co Ltd filed Critical Beijing Samsung Telecom R&D Center
Priority to US15/539,922 priority Critical patent/US10454632B2/en
Publication of WO2016105173A1 publication Critical patent/WO2016105173A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H04L1/1893—Physical mapping arrangements
    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • 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
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes

Definitions

  • the present disclosure relates to a technical field of wireless communication technology, in particular, to a Hybrid Automatic Repeat Request (HARQ) transmission, especially to a method, a communication apparatus and a base station for performing the HARQ transmission in a Long Term Evolution (LTE) system.
  • HARQ Hybrid Automatic Repeat Request
  • Fig. 1 is a schematic diagram of an FDD wireless frame configuration in prior art.
  • each wireless frame has a length of 10ms and includes 10 sub-frames each having a length of 1ms.
  • Fig. 2 Fig.
  • each wireless frame of 10ms is equally divided into two half frames each having a length of 5ms.
  • each half frame includes 8 sub-frames each having a length of 0.5ms and 3 special domains, that is, Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS), wherein the sum of the lengths of the 3 special domains is 1ms.
  • TTI Downlink Transmission Time Interval
  • D represents the downlink sub-frame
  • U represents the uplink sub-frame
  • S represents the special sub-frame including the above 3 special domains.
  • the first n Orthogonal Frequency Division Multiplexing (OFDM) symbols of each downlink sub-frame can be used to transmit the downlink controlling information.
  • the downlink controlling information includes Physical Downlink Control Channel (PDCCH) and other controlling information, where n equals to 0, 1, 2, 3, or 4.
  • the rest OFDM symbols can be used to transmit Physical Downlink Shared Channel (PDSCH) or Enhanced PDCCH (EPDCCH).
  • PDCCH and EPDCCH carry Downlink Control Information (DCI) of the uplink or downlink channel resources, which are referred to as Downlink Grant (DL Grant) and Uplink Grant (UL Grant), respectively.
  • DCI Downlink Grant
  • UL Grant Uplink Grant
  • a greater operation bandwidth is obtained by combining a plurality of Component Carriers (CC). That is to say, Carrier Aggregation (CA) is used to constitute the downlink and the uplink of the communication system, thereby supporting a greater transmission rate.
  • CA Carrier Aggregation
  • the CC combined together not only can employ the same duplex way, i.e., all the cells are FDD cells or TDD cells, but also can use different duplex ways, i.e., the FDD cells and the TDD cells both exist.
  • the base station can be configured to operate in a plurality of cells, one of which is a primary cell (Pcell), and the others are referred to as secondary cells (Scell).
  • Pcell primary cell
  • Scell secondary cells
  • both the HARQ re-transmission and an initial transmission for the same Transport Block (TB) are limited to the same CC.
  • CSI Channel State Information
  • HARQ-ACK Hybrid Automatic Repeat Request Acknowledgement
  • PUCCH Physical Uplink Control Channel
  • the unlicensed bands generally have been allocated for some other usages, such as the radar system and/or the Wireless Fidelity (WiFi) system of 802.11 series.
  • the WiFi system of 802.11 series operates based on a mechanism of Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA).
  • CSMA/CA Carrier Sense Multiple Access/Collision Avoidance
  • a Station (STA) must detect the wireless channel before transmitting signals, and the wireless channel can be occupied to transmit signals only if the wireless channel has been idle for a period of time.
  • the STA can simutaneously use two mechanisms to determine the state of the wireless channel.
  • the STA can use a Carrier Sensing technology to detect the wireless channel actually. When other STA signals are detected or the detected signal power exceeds the set threshold, it is determined that the wireless channel is busy.
  • a Clear Channel Assessment (CCA) report reported by a physical layer module of STA to its high level module indicates that the wireless channel is busy.
  • the WiFi system of 802.11 series also introduces the virtual carrier sense technology, that is, Network Allocation Vector (NAV).
  • NAV Network Allocation Vector
  • a duration domain is included in each 802.11 frame, and the NAV value set according to the duration domain confirms that signals can not be transmitted on the wireless channel, wherein NAV is the time indicating the wireless channel needs to be reserved.
  • LTE apparatus is used to refer to base station and UE in general.
  • the LTE system apparatus first needs to detect the state of the channel before transmitting signals, the apparatus can occupy the channel only when the condition of occupying the channel is satisfied. Furthermore, the apparatus may occupy the channel for one or more sub-frames, and then the channel must be released, thereby giving opportunities for other apparatuses to occupy the channel.
  • a LTE apparatus has to release the channel resource after occupying the channel and transmiting data.
  • the number of apparatuses participating competition on the component carrier is relatively large, it may take the LTE apparatus a relatively long time to re-seize the channel and then make a HARQ re-transmission for data that were not unsuccessfully transmitted in the last time. This limits the effectiveness of HARQ transmission to some extent.
  • the present application provides a method, a base station and a communication apparatus for the HARQ transmission.
  • a hybrid automatic repeat request (HARQ) transmission method for a communication apparatus comprises: receiving configuration information related to a cross-carrier HARQ transmission from a base station, an initial transmission and a re-transmission of the HARQ transmission processable on different physical component carriers; receiving downlink control information from the base station, the downlink control information including control information for the cross-carrier HARQ transmission; and performing the cross-carrier HARQ transmission according to the configuration information and the downlink control information.
  • HARQ hybrid automatic repeat request
  • the configuration information indicates that that the cross-carrier HARQ transmission is processed based on virtual component carriers (VCC), wherein the communication apparatus is configured with N physical component carriers and M VCCs, each of the M VCCs is used to identify data transmission of one or more available sub-frames of a group of physical component carriers among the N physical component carriers, the data transmission identified by a VCC can be performed on any one of a group of physical component carriers corresponding to the VCC, M and N are positive integers and M is less than N.
  • VCC virtual component carriers
  • the performing the HARQ transmission according to the configuration information and the downlink control information comprises: determining an index of the VCC corresponding to the data transmission based on VCC index information received from the base station.
  • the VCC index information indicates any one of: a VCC corresponding to data transmission in a scheduled sub-frame; and a VCC corresponding to data transmission in continuous sub-frames of a physical component carrier.
  • the number of bits used by the VCC index information is any one of: , where M is the number of the VCCs configured in the configuration information; and , where M max is the maximum number of the VCCs needing support.
  • he performing the HARQ transmission according to the configuration information and the downlink control information comprises: processing soft buffer based on the VCC.
  • the processing soft buffer based on the VCC comprises at least one of: processing rate match according to the maximum number M DL_ HARQ of HARQ processes of the VCC and the number of transmission blocks (TB) supported by the VCC in a sub-frame; and caching the soft bit according to the number M of VCCs, the maximum number M DL_ HARQ of HARQ processes of the VCC and the number of TBs supported by VCC in a sub-frame.
  • the maximum number M DL_ HARQ of HARQ processes of the VCC is determined by at least one of the following: receiving a high layer signaling from the base station, wherein the high layer signaling configures the maximum number M DL_ HARQ of HARQ processes of each respective VCC; receiving a high layer signaling from the base station, wherein the high layer signaling configures the maximum number M DL_ HARQ of HARQ processes and applies the maximum number M DL_ HARQ of HARQ processes to all VCCs; pre-defining the maximum number M DL_ HARQ of HARQ processes of each VCC as a fixed value; determining the maximum number M DL_ HARQ of HARQ processes of VCC mapped by the physical component carrier according to the maximum number of HARQ processes of the physical component carrier; and determining the maximum number M DL_ HARQ of HARQ processes of M VCCs sequentially according to the maximum number of HARQ processes of the first M physical component carriers among the N physical component carriers.
  • the transmitted data are divided into several data groups, wherein all HARQ feedbacks of data in a data group are mapped onto the same physical component carrier for transmission.
  • the data can be divided according to any one of: physical component carriers used for transmitting the data; and corresponding VCCs in transmitting the data.
  • the performing the HARQ transmission according to the configuration information and the downlink control information comprises: during downlink HARQ transmission, determining the number of bits of an HARQ-ACK information and determining a sequence of respective HARQ-ACK information according to the number of VCCs corresponding to a data group, the size of a VCC binding window of a sub-frame n for transmitting the HARQ-ACK information, and the number of TBs supported by VCC in a sub-frame.
  • the determining the sequence of of the respective HARQ-ACK information comprises: sequencing the HARQ-ACK information according to the index sequence of the VCC; and sequencing several HARQ-ACK information aiming at the same VCC according to downlink allocation index (DAI) of the VCC, wherein DAI indentifies the sequence of a plurality of data transmissions scheduled on the VCC.
  • DAI downlink allocation index
  • the size of the VCC binding window of the sub-frame n for transmitting the HARQ-ACK information is determined according to any one of the following: determining the size of the VCC binding window according to a reference HARQ timing of the VCCs corresponding to the sub-frame n; and receiving the high layer signaling from the base station, wherein the high layer signaling configures the size of the VCC binding window.
  • the reference HARQ timing of VCC is determined by any one of the following: receiving the high layer signaling from the base station, wherein the high layer signaling configures the reference HARQ timing of each respective VCC; receiving the high layer signaling from the base station, wherein the high layer signaling configures the reference HARQ timing and applies the reference HARQ timing to all VCCs; determining the reference HARQ timing of VCC mapped by the physical component carrier according to the reference HARQ timing of the physical component carrier; and determining the reference HARQ timing of M VCC sequentially according to the reference HARQ timing of the first M physical component carriers among the N physical component carriers.
  • the configuration information indicates that the cross-carrier HARQ transmission is processed based on a combined HARQ process
  • the communication apparatus is configured with N component carriers, which are divided into several groups of physical component carriers, and a set of combined HARQ processes is defined on each group of physical component carriers, the initial transmission and the re-transmission of each of the set of combined HARQ processes can be mapped to different physical component carriers of the groups of physical component carriers.
  • the performing the HARQ transmission according to the configuration information and the downlink control information comprises: determining the HARQ process corresponding to the data transmission based on a combined HARQ process ID included in the downlink control information, wherein the number of bits used by the combined HARQ process ID is any one of: , where M u is the number of the combined HARQ processes in the set of combined HARQ processes configured by the high layer signaling; and , where M u-max is the maximum number of combined HARQ processes that need to be supported by the corresponding group of physical component carriers.
  • the performing the HARQ transmission according to the configuration information and the downlink control information comprises: processing soft buffer with respect to each combined HARQ process, respectively.
  • the processing soft buffer with respect to each combined HARQ process respectively comprises at least one of the following: processing rate match according to the maximum number M DL_ uHARQ of HARQ processes of a combined HARQ process and the number of TBs supported on a sub-frame of the physical component carrier to which the combined HARQ process is mapped; caching the soft bit according to the total number of combined HARQ processes of the N physical component carriers and the number of TBs supported on a sub-frame of the physical component carrier to which the combined HARQ process is mapped; and caching the soft bit according to the number G of the group of physical component carriers, the number M u of combined HARQ processes of the set to which a combined HARQ process belongs, and the number of TBs supported on a sub-frame of the physical component carrier to which the combined HARQ process is mapped.
  • the maximum number M DL_ uHARQ of HARQ processes of the combined HARQ process is determined by at least one of the following: receiving high layer signaling from the base station, wherein the high layer signaling configures the maximum number M DL_ uHARQ of HARQ processes of each combined HARQ process, respectively; receiving high layer signaling from the base station, wherein the high layer signaling configures a maximum number M DL_uHARQ of HARQ processes, and applies the maximum number M DL_ uHARQ of HARQ processes to all combined HARQ processes; pre-defining the maximum number M DL_ HARQ of HARQ processes of each combined HARQ process as a fixed value; determining according to the maximum number of HARQ processes of the reference HARQ timing of the physical component carrier to which current data transmission of the combined HARQ process is mapped; and determining according to the maximum number M DL_ HARQ of HARQ processes of the reference HARQ timing of the physical component carrier to which the initial transmission of current
  • a hybrid automatic repeat request (HARQ) transmission method for a base station comprises: transmitting configuration information of a cross-carrier HARQ transmission to a communication apparatus, an initial transmission and a re-transmission of the HARQ processable on on different physical component carriers; transmitting downlink control information to the communication apparatus, the downlink control information including the control information for the cross-carrier HARQ transmission; and performing the cross-carrier HARQ transmission according to the configuration information and the downlink control information.
  • HARQ hybrid automatic repeat request
  • the configuration information indicates that the cross-carrier HARQ transmission is processed based on virtual component carriers (VCC), wherein the communication apparatus is configured with N physical component carriers and M VCCs, each of the M VCCs is used to identify data transmission of one or more available sub-frames of a group of physical component carriers among the N physical component carriers, the data transmission identified by a VCC can be performed on any one of a group of physical component carriers corresponding to the VCC, M and N are positive integers and M is less than N.
  • VCC virtual component carriers
  • the configuration information indicates that the cross-carrier HARQ transmission is processed based on a combined HARQ process
  • the communication apparatus is configured with N component carriers, which are divided into several groups of physical component carriers, and a set of combined HARQ processes is defined on each group of physical component carriers, the initial transmission and the re-transmission of each of the set of combined HARQ processes can be mapped to different physical component carriers of the groups of physical component carriers.
  • a method of processing the soft buffer comprising: receiving configuration information for processing the soft bit cache from a base station; receiving downlink control information and accordingly receiving downlink data from the base station, and caching soft bits which receive wrong data.
  • the configuration information for processing the soft bit cache comprises: for a group of CCs, configuring the maximum number of HARQ processes through high layer signalings respectively; or configuring the maximum number of HARQ processes by high layer signalings and applying to all data transmission of N CCs; or pre-defining the maximum number of HARQ processes as a fixed value; or determining the maximum number of HARQ processes according to a reference HARQ timing of the CC where data transmission exists.
  • caching soft bits which receive wrong data comprises: processing a group of CCs according to the number of equivalent CCs, according to the sum of the equivalent number of CCs corresponding to N component carriers for processing the soft bit cache, and the maximum number of HARQ processes of the CC and the number of TBs supported on a sub-frame of the CC; or processing a group of CCs according to the number of TBs, according to the sum of the equivalent number of TBs corresponding to N component carriers for processing the soft bit cache in a sub-frame, and the maximum number of HARQ processes of the CC; or processing a group of CCs according to the number of TBs, according to the sum of the equivalent number of TBs corresponding to N component carriers for processing the soft bit cache in a sub-frame, and the maximum number of HARQ processes of the CC; or processing a group of CCs according to the number of equivalent HARQ processes, according to the sum of the equivalent number of HARQ processes of configured N component carriers for
  • a communication apparatus comprising a receiver, a transmitter and a processor.
  • the receiver is configured to receive configuration information of a cross-carrier HARQ transmission from a base station. An initial transmission and a re-transmission of the HARQ are processable on different physical component carriers.
  • the receiver is further configured to receive downlink control information from the base station, and the downlink control information includes control information for the cross-carrier HARQ transmission.
  • the processor is configured to control the receiver and the transmitter to perform the cross-carrier HARQ transmission according to the configuration information and the downlink control information.
  • a base station comprising a receiver, a transmitter and a processor.
  • the processor is configured to determine configuration information of a cross-carrier HARQ transmission, an initial transmission and a re-transmission of the HARQ are processable on different physical component carriers.
  • the transmitter is configured to transmit the configuration information of the cross-carrier HARQ transmission to a communication apparatus.
  • the transmitter is further configured to transmit downlink control information to the communication apparatus.
  • the processor is further configured to control the receiver and the transmitter to perform the HARQ transmission according to the configuration information and the downlink control information.
  • the HARQ transmission for the same data on a plurality of physical component carriers can be realized, thereby the effectiveness of the HARQ transmission can be improved.
  • the cross-carrier HARQ transmission is performed by the process based on combined HARQ or Virtual Component Carrier (VCC), thereby reducing the signaling overheads for supporting the cross-carrier HARQ transmission.
  • VCC Virtual Component Carrier
  • Fig. 1 illustrates a schematic diagram of a configuration of an FDD wireless frame in prior art
  • Fig. 2 illustrates a schematic diagram of a configuration of a TDD wireless frame in prior art
  • Fig. 3 illustrates an example of signal flow of a cross-carrier HARQ transmission according to an embodiment of the present application
  • Fig. 4 illustrates a schematic graph of VCC according to an embodiment of the present application
  • Fig. 5 illustrates another schematic graph of VCC according to an embodiment of the present application
  • Fig. 6 illustrates a schematic diagram of an implementation of processing HARQ-ACK transmission according to an embodiment of the present application
  • Fig. 7 illustrates a schematic diagram of another implementation of processing HARQ-ACK transmission according to an embodiment of the present application.
  • Fig. 8 illustrates a schematic block diagram of an apparatus which can be configured to implement an exemplary embodiment of the present application.
  • Base Station is an access device for accessing communication apparatuses to a cellular network, and it is used to allocate communication resources to the communication apparatuses.
  • the Base Station may be any one of the following physical devices: an enhanced Node B (eNB), a Node B, a wireless electrical access unit, a base station controller, a base transceiver station, etc.
  • the communication apparatuses can be any apparatuses intended to access service via an access network and can be configured to communicate through the access network.
  • the communication apparatuses can include, but not limit to: a User Terminal (UE), a Mobile Station (MS), a cellular phone, a smart phone, computer, or a multimedia system provided with a communication function.
  • UE User Terminal
  • MS Mobile Station
  • cellular phone a smart phone
  • computer or a multimedia system provided with a communication function.
  • the embodiments of the present application provide a solution of processing cross-carrier HARQ transmission.
  • Fig. 3 illustrates an example of the signal flow of processing cross-carrier HARQ transmission between User Terminal (UE) and Base Station (eNB) according to an embodiment of the present application.
  • UE User Terminal
  • eNB Base Station
  • a base station transmits configuration information of a cross-carrier HARQ transmission to a user terminal UE.
  • the user terminal UE receives configuration information of the cross-carrier HARQ transmission from a base station.
  • an initial transmission and a re-transmission of the same HARQ process can be performed on different physical component carriers. It can be understood that, depending on sub-frames of actually configured and available physical component carriers, the initial transmission and the re-transmission of the same HARQ process can be performed on different physical component carriers and also on the same physical component carrier, thereby achieving the flexibility of the HARQ transmission.
  • the configuration information can configure UE to perform a data transmission based on the cross-carrier HARQ transmission.
  • the configuration information can indicate or configure UE with a mechanism of processing the cross-carrier HARQ transmission.
  • the configuration information can give indication of processing the cross-carrier HARQ transmission by configuring UE with a mechanism of VCC (Virtual Component Carrier), and can also give indication of processing the cross-carrier HARQ transmission by a mechanism of combining HARQ process, which will be described in detail hereinafter.
  • VCC Virtual Component Carrier
  • the base station transmits downlink control information to the UE.
  • the user terminal UE receives the downlink control information from the base station.
  • the downlink control information includes control information for the cross-carrier HARQ transmission.
  • the downlink control information is used to allocate uplink channel resources or downlink channel resources.
  • the downlink control information can include, for example, VCC index information or combined HARQ process identification (ID) information, etc.
  • the above control information is mainly used to identify the VCC index or the combined HARQ process identification (ID), so as to determine the VCC or the combined HARQ process corresponding to scheduled transmitting data.
  • the base station and the user terminal can perform the cross-carrier HARQ transmission according to the configuration information and the downlink control information.
  • the cross-carrier HARQ transmission can include an uplink cross-carrier HARQ transmission and a downlink cross-carrier HARQ transmission.
  • UE receives the downlink data according to the downlink control information, such as the DL grant, and processes the received downlink data according to the DL grant.
  • the downlink control information such as the DL grant
  • the UE transmits the uplink data according to the downlink control information, such as the UL grant, and handles the transmitted uplink data according to the UL grant.
  • the downlink control information such as the UL grant
  • the embodiments of the present application are set forth by taking the example of the downlink cross-carrier HARQ transmission. Those skilled in the art can understand that the features described with respect to the downlink cross-carrier HARQ transmission can be applied to the uplink cross-carrier HARQ transmission correspondingly.
  • the UE needs to transmit HARQ-ACK information, i.e., HARQ feedback, to the base station according to the number of physical CCs, and the signaling overheads are relatively high.
  • HARQ-ACK information i.e., HARQ feedback
  • the cross-carrier HARQ transmission provided by the present application can be implemented based on different mechanisms.
  • the exemplary implementation of the cross-carrier HARQ transmission according to the present application will be described in connection with particular embodiments.
  • the cross-carrier HARQ transmission is processed based on a mechanism of Virtual Component Carrier (VCC).
  • VCC Virtual Component Carrier
  • the apparatus can only transmit data for a period of time upon occupying a channel, and then the channel needs to be released. Moreover, for different component carriers, the time at which a channel is obtained is usually different.
  • Fig. 4 illustrates a schematic diagram of an apparatus competing for channel resources on two component carriers.
  • the time at which the apparatus obtains a resource on component carrier 1 is different from time that the apparatus obtains a resource on component carrier 2.
  • having the cross-carrier HARQ transmission supported equals to that the apparatus can occupy resources on a component carrier more intensively. Therefore, the channel resources occupied by the apparatus on two component carriers can be mapped more intensively to resources occupied by the apparatus on a virtual component carrier (VCC).
  • VCC virtual component carrier
  • Fig. 5 illustrates another schematic diagram of an apparatus competing for channel resources on two component carriers.
  • the total resources available for the apparatus sometimes may come from more than one component carriers.
  • both the component carriers 1 and 2 are avaliable.
  • the base station prevents a potion of two component carriers that the available channel overlaps from scheduling data for the same UE, it is still believed that the resources can be treated as, from the UE side, being on one component carrier.
  • the probability that above situation occurs decreases accordingly. Accordingly, influence on UE transmission rate is reduced. In other words, for a UE configured with cells having unlicensed bands, the number of the configured component carriers decreases.
  • the UE will still occupy only a part of a sub-frame resource of each component carrier. That is to say, the proportion of time actually taken by a component carrier for data transmission of UE is less than 1. In other words, from the perspective of the UE side, the number of component carriers configured for the UE decreases. This problem is not specially solved in existing CA system.
  • the proportion of time that above N component carriers actually allocates to the UE is small due to occupation of the channel or scheduling of the base station, and so on.
  • a component carrier having unlicensed band can be actually used for a data transmision only in a part of time, and the more the number of apparatuses participating competition is, the smaller the proportion of time that an apparatus can occupy the channel is. From the perspective of the average effect on the UE side, the amount of data the UE can transmit during a period of time is reduced. Therefore, for a component carrier, the cross-carrier HARQ process may not need to be designed accoring to the fact that all time can be used to transmit data.
  • N component carriers can be equivalently considered as that fact that M Virtual Component Carriers (VCC) are configured, and the proportion of time that these M VCCs actually allocate to the UE is large. It can be understood that M is less than or equals to N.
  • data transmitted on N component carriers configured for the UE can be considered to correspond to an initial transmission or an HARQ re-transmission of data of the above M VCCs.
  • a plurality of rules can be made to configure the VCC, and the present application has no limitation to this aspect. As such, the behavior of the UE can be processed based on the number M of VCCs.
  • CCs on which physical channels of the initial transmission and the re-transmission of the datus are present can be different, but the same VCC can be used to identify the initial transmission and the re-transmission of this datus.
  • an HARQ process is identified by both the VCC index and the HARQ process ID.
  • the data of the same VCC are allowed to be transmitted on PDSCH of different CCs.
  • the UE can conduct HARQ incorporation on the initial transmission and the re-transmission of data of the same VCC and the same HARQ process ID.
  • the configuration information transmitted by the base station to the user terminal indicates that the cross-carrier HARQ transmission is processed based on the virtual component carrier VCC, wherein the user terminal is configured with N physical component carriers and M virtual component carriers (VCC), and each VCC is used to identify the data transmission of one or more available sub-frames of a group of physical component carriers among the N physical component carriers.
  • the data transmission identified by a VCC can be performed on any of a group of physical component carriers corresponding to the VCC.
  • M and N are positive integers, and M is smaller than N.
  • one VCC may only identify the data transmission of one or more available sub-frames of one physical component carrier, that is, the initial transmission and the re-transmission of the same data identified by the VCC are performed on the one physical component carrier.
  • each VCC must be allocated with a unique VCC index.
  • the N CCs configured for the UE are divided into several groups and the cross-carrier HARQ transmission is limited to being performed separately in each group, each VCC in a group must be allocated with a unique VCC index, but the VCC indexes in different groups may be the same or different.
  • the number M of VCCs and parameters of each VCC need to be configured.
  • the parameters of VCC can include, for example, Transmission Mode (TM), reference HARQ timing, maximum number (M DL_ HARQ ) of HARQ process, etc.
  • TM of VCC refers to the number of TBs supported by the VCCs in a sub-frame, that is to say, it means whether the number of TBs which the VCCs can transmit simultaneously in a sub-frame is 1 or 2.
  • the number M of VCCs and the parameter of each VCC can be configured by a plurality of methods.
  • the base station transmits a high layer signaling to a user terminal UE, and the high layer signaling configures the number of VCCs of the UE and configures the parameter of each respective VCC.
  • the base station transmits a high layer signaling to the user terminal UE, and the high layer signaling configures the number of VCCs of the UE and configures all VCCs to use the same parameter.
  • the base station when configuring each of N CCs of the UE, indicates whether the configuration information of a CC is used to map the configuration information of a VCC. For example, one bit can be used for indicating this.
  • the parameter of the corresponding VCC can be obtained according to the configuration information of this CC.
  • the number M of VCCs configured for the UE can be obtained according to the number of CCs which have mapped VCC in the configuration information of the N CCs.
  • the indexes of the mapped VCCs can be included in the configuration information of M CCs, or the index of the corresponding VCC can be further determined according to the sequence of indexes of the M CCs corresponding to the VCC.
  • the base station transmits a high layer signaling to the user terminal UE, and the high layer signaling configures the number M of VCCs of the UE, and deems that the configuration information of the first M CCs among N CCs configured for the UE map the parameters of the M VCCs sequentially.
  • the user terminal UE can determine the VCC index corresponding to the data transmission based on VCC index information received from the base station. A plurality of methods can be used to indicate the VCC index information.
  • the method of indicating the VCC index comprises adding the VCC index information to DCI scheduling the data transmition, for example, adding additional VCC index information domain, or re-using existing information domain to indicate the VCC index information, thereby indicating the VCC corresponding to the data transmission in a sub-frame.
  • the method of indicating the VCC index comprises transmitting indicating information of a VCC index and applying it to continuous sub-frames of a component carrier. For example, for a cell having unlicensed bands, when channel occupation indication information of the cell is transmited, which VCC the data transmission of all sub-frames of this channel occupation corresponds to is also indicated.
  • the above indication information can also be achieved by the downlink control information, for example, using a DCI format of Common Search Space (CSS), wherein the number of bits of the DCI format equals to that of the DCI format 1A or 1C.
  • SCSS Common Search Space
  • the VCC index information can indicate any one of: a VCC corresponding to the data transmission in a scheduled sub-frame; and a VCC corresponding to the data transmission in continuous sub-frames of a physical component carrier.
  • bits of indication information can be used in the DCI.
  • the method of indicating the VCC index can reduce the bit overheads of the DCI format, compared to the method of distinguishing N CCs in the DCI.
  • the number of bits needs to be used in DCI can be determined according to the maximum number M max of VCCs needing support. That is, the VCC index information is indicated by using bits.
  • the number of bits so obtained is independent of the number of currently and actually configured VCCs, thereby keeping the number of bits in the DCI format unchanged. Due to occupation of channel or scheduling of base station, etc., the above maximum number of VCCs needing support is usually less than the number N of CCs that can be configured for the UE, thus the bit overheads can be reduced.
  • the cross-carrier HARQ transmission can comprise processing soft buffer based on the VCC.
  • the processing of the soft buffer comprises two parts of contents, that is, rate match and storage of soft bit. Therefore, to process the soft buffer based on the VCC can comprise at least one of: processing the rate match according to the maximum number M DL_ HARQ of HARQ processes of the VCC and the number of TBs supported by the VCC in a sub-frame; and caching the soft bit according to the number M of VCCs, the maximum number M DL_ HARQ of HARQ processes of the VCC and the number of TBs supported by the VCC in a sub-frame.
  • the parameters of VCC can include, for example, Transmission Mode (TM), reference HARQ timing, maximum number (M DL_HARQ ) of HARQ process, etc.
  • TM Transmission Mode
  • M DL_HARQ maximum number of HARQ process
  • the number M of VCCs and each parameter of the VCC can be configured by a plurality of methods.
  • the maximum number M DL_ HARQ of HARQ processes of the VCC can be determined by any of the following methods.
  • the high layer signaling is received from the base station.
  • the maximum number M DL_ HARQ of HARQ processes of each VCC is configured by the high layer signaling, respectively.
  • the high layer signaling is received from the base station, and the high layer signaling is configured with a maximum number M DL_ HARQ of HARQ processes, applies the maximum number M DL_HARQ of HARQ processes to all VCCs. That is to say, the maximum number of HARQ processes of all VCCs is the maximum number M DL_ HARQ of HARQ processes configured by the high layer signaling.
  • the maximum number M DL_ HARQ of HARQ processes of VCC mapped by a CC is determined by the maximum number of HARQ processes of the CC.
  • the base station indicates that whether configuration information of a CC is used to map the configuration information of a VCC. For example, the indication can be made by using one bit.
  • the maximum number M DL_ HARQ of HARQ processes of the corresponding VCC can be determined as the maximum number of HARQ processes of the CC.
  • the number M of VCCs of the UE can be configured by using high layer signaling directly, and the maximum number M DL_HARQ of HARQ processes of M VCCs is determined sequentially according to the maximum number of HARQ processes of the first M CCs among N CCs.
  • soft buffer of each code block in processing rate match, during the processing of date of one corresponding VCC, soft buffer of each code block can be processed according to the maximum number M DL_ HARQ of HARQ processes of the VCC. For example, when the rate match is made for each code block of a TB, the size of the soft buffer of the code block is
  • C is total number of code blocks divided by TB
  • K w is total number of code bits output by a turbo code
  • the soft bit cache can also be processed according to the maximum number M DL_ HARQ of HARQ processes of VCC. For example, at the side of UE, the soft buffer can be equally divided by the UE according to the number M of VCCs. Then, when the decoding of a code block of a TB fails, for each VCC and at least
  • the number of the soft bits saved at least for the code block is
  • M is total number of VCCs.
  • the soft bits , w k are recorded as a soft bit received by the UE, and k is the smaller index among the indexes of soft bits received by the UE.
  • the base station can be based on above method in which UE saves a soft bit for a code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on the additional redundance.
  • HARQ IR HARQ re-transmission operation
  • the method of processing the HARQ-ACK information transmission with respect to the mechanism based on the VCC that is, the method of transmitting the HARQ feedback, is described below.
  • HARQ-ACK information of the data transmition on a plurality of component carriers is gathered on a component carrier, such as Pcell, for transmission.
  • the transmitted data are divided into several data groups, wherein all HARQ feedbacks of data in a data group are mapped onto the same CC for transmission.
  • the data can be divided according to any one of: a CC used for transmitting data; and the corresponding VCC in transmitting data.
  • the transmitted data can be divided according to physical CCs used for transmission. That is to say, a data group corresponds to a group of physical CCs. The number of division can be larger than or equal to 1.
  • the HARQ-ACK information is fed back with respect to each group of CCs, respectively. That is to say, the HARQ-ACK information of data in the same group of CCs is mapped onto a sub-frame of a certian CC for transmission. Assuming that the number of a group of CCs is N g , the data transmission of the group of CCs is identified by using a group of VCC indexes. The range of the VCC indexes used by different groups of CCs can be the same or different.
  • the number of VCCs corresponding to above group of N g CCs is N gv , wherein N gv is smaller than or equals to N g . If the CCs are not divided into groups, or are divided into only one group, the cross-carrier HARQ transmission for the data of a VCC can be performed on any CC, and each VCC must be allocated with a unique VCC index.
  • the transmitted data can also be divided into groups according to VCC information of data transmission directly, without limiting that the data of the corresponding VCC is transmitted on which physical CC.
  • the number of divided groups of VCCs is greater than or equals to 1.
  • the HARQ-ACK information is fed back with respect to each group of VCCs, respectively.
  • Each VCC must be allocated with a unique VCC index, and the HARQ-ACK information of data corresponding to a group of VCCs is mapped onto a sub-frame of a certian CC for transmission.
  • the cross-carrier HARQ transmission can comprise: first, for a data group and an uplink sub-frame of CC for transmitting the HARQ-ACK information, a set of downlink sub-frames for feeding back the HARQ-ACK information on the uplink sub-frame is determined; next, in the above set of downlink sub-frames, according to the number of VCCs corresponding to the data group, a size of a VCC binding window of a sub-frame n for transmitting HARQ-ACK information, and the number of TBs supported by the VCC in a sub-frame, the number of bits for HARQ-ACK transmission is determined, and the sequence of each piece of HARQ-ACK information is determined.
  • the HARQ-ACK information of the data group can be fed back.
  • the HARQ-ACK transmission method in the existing CA system can be re-used.
  • the HARQ-ACK transmission method for a group of CCs or VCCs is described below.
  • a set of downlink sub-frames of each of the group of CCs that need to feed back the HARQ-ACK information on the uplink sub-frame n are determined firstly.
  • a binding window mapped to the uplink sub-frame n can still be determined according to the reference HARQ timing of the CC. That is to say, HARQ-ACK of the data of sub-frames of the CC within the binding window is transmitted on the uplink sub-frame n.
  • the reference HARQ timing of each CC can be the same or different.
  • the HARQ-ACK transmitting method is determined according to the VCC information of the corresponding data transmission.
  • the number N gv of VCCs, the size of the binding window of each VCC, and the number of TBs of each VCC in a sub-frame the number of bits for the HARQ-ACK transmission and the sequence of each HARQ-ACK bit can be determined.
  • the size of the binding window corresponding to a VCC can be determined according to the reference HARQ timing of the VCC, or, for the uplink sub-frame n, the size of the binding window corresponding to a VCC can also be configured by a high layer signaling.
  • the uplink sub-frame for the HARQ-ACK transmission can be determined according to the referential HARQ-ACK timing of the corresponding VCC. In this implementation, it is needed to ensure that the HARQ-ACK timing according to VCC can be mapped to the uplink sub-frame that carries the HARQ-ACK component carrier. In other words, for the data transmission of a sub-frame of a CC, it is not needed to care about the reference HARQ timing of the CC, instead, the timing of the uplink sub-frame of the HARQ-ACK transmission of the data is determined according to the reference HARQ timing of VCC corresponding to each datus directly.
  • the reference HARQ timing of each VCC can be the same or different.
  • the HARQ-ACK transmission method is determined according to the VCC information transmitted by the corresponding data.
  • the number N gv of VCCs the size of the binding window of each VCC, and the number of TB of each VCC in a sub-frame
  • the number of bits for the HARQ-ACK transmission and the sequence of each HARQ-ACK bit can be determined.
  • the size of the binding window of the uplink sub-frame n corresponding to a VCC can be determined according to the reference HARQ timing of the VCC.
  • determining the sequence of each piece of HARQ-ACK information can comprise: sequencing the HARQ-ACK information according to the index sequence of VCC; and a plurality of HARQ-ACK information of the same VCC is sequenced according to the downlink allocation index DAI of VCC, wherein the DAI indentifies the transmission sequence of a plurality of data scheduled on a VCC.
  • the DAI information needs to be further indicated.
  • the DAI does not indentify the data transmission of a plurality of sub-frames scheduled on a CC, instead it identifies a plurality of data transmissions scheduled on a VCC.
  • the DAI equals to the total number of DL grants that the VCC index has transmited before the current timing of the sub-frame.
  • corresponding one VCC index can be limited, and data can be scheduled on at most one CC; or on a sub-frame, it may also be allowed that the data of the same VCC index is scheduled on a plurality of CC indexes. If it is allowed that the data corresponding to the same VCC is scheduled on a plurality of CCs at the timing of one sub-frame, it can be configured that DL grant of the above data of the plurality of CCs is scheduled to occupy continuous DAI in the sub-frame, and the minimum value of these DAI equals to the total number of the DL grants corresponding to VCC that has been scheduled before the sub-frame and adds 1.
  • the HARQ-ACK information of the corresponding one VCC can be sequenced according to the sequence of DAI of VCC.
  • DAI can still be transmitted, that is, the value of the DAI can only be 1; or although the DAI information domain is included in DCI, it is kept from using; or it is also unnecessary to have the DAI information domain included in DCI, thereby reducing the number of bits of the DCI.
  • each piece of HARQ-ACK information is sequenced according to the sequence of VCC indexes, and each piece of HARQ-ACK information corresponding to the same VCC can be sequenced according to the sequence of DAI.
  • the corresponding one VCC has HARQ-ACK of the data in semi-persistent scheduling, it mapps to a fixed location, for example, it can be arranged before HARQ-ACK of all data in dynamic scheduling of this VCC, or it can map onto the last location of the binding window of this VCC.
  • HARQ-ACK of corresponding one VCC can be sequenced according to the DAI sequence.
  • the data can be scheduled at most on one CC for corresponding one VCC index; or it may also be allowed that the data of the same VCC index is scheduled on a plurality of CCs.
  • the corresponding HARQ-ACK can be obtained according to sub-frames of the binding window of VCC, thereby the HARQ-ACK information can be transmitted by using the method based on Channel Selection; or HARQ-ACK of corresponding one VCC can be sequenced according to the DAI sequence.
  • HARQ-ACK of corresponding one VCC can only be sequenced according to the DAI sequence, and it is needed to limit that the downlink data of W sub-frames can be scheduled at most at the binding window of a VCC, wherein W is the number of the downlink sub-frame of the binding window of the VCC.
  • the parameters of VCC can include, for example, Transmission Mode (TM), reference HARQ timing, maximum number (M DL_ HARQ ) of HARQ processes, etc.
  • TM Transmission Mode
  • M DL_ HARQ maximum number
  • the number M of VCCs and each parameter of the VCC can be configured by a plurality of methods. The method of determining the reference HARQ timing of the VCC is described below.
  • the high layer signaling is received from the base station, and the high layer signaling configures a reference HARQ timing of each respective VCC.
  • the high layer signaling is received from the base station, and the high layer signaling configures a reference HARQ timing and applies the reference HARQ timing to all VCCs.
  • the reference HARQ timing of VCC mapped by a CC is determined according to the reference HARQ timing of the CC. In particular, whether the configuration information of a CC is used to map the configuration information of a VCC can be indicated when each of N CCs of the UE is configured. For a CC which maps a VCC, the reference HARQ timing of the corresponding VCC is determined according to the reference HARQ timing of the CC.
  • the number M of VCCs of UE is configured by using high layer signaling directly, and it is deemed that the reference HARQ timing of the first M CCs among N CCs configuring the UE corresponds to the reference HARQ timing of M VCCs sequentially. That is, the reference HARQ timing of M VCCs is determined sequentially according to the reference HARQ timing of the first M CCs among the N CCs.
  • the above reference HARQ timing may refer to FDD timing, the timing of HARQ of 7 kinds of TDD uplink and downlink configurtions, the timing of HARQ of FDD Scell defined by TDD-FDD CA system with respect to TDD Pcell and FDD Scell, or other newly defined timing relationships.
  • Fig. 6 illustrates a schematic diagram of one implementation of processing HARQ-ACK transmission according to an embodiment of the present application.
  • the binding window mapped to the uplink sub-frame is determined according to the reference HARQ timing of each physical CC.
  • the reference HARQ timing of cell 1 is TDD uplink and downlink configuration 1
  • the reference HARQ timing of cell 2 is TDD uplink and downlink configuration 2
  • the reference HARQ timing of cells 3-5 is the timing of HARQ defined by TDD-FDD CA system using an LTE system, in particular, the timing of HARQ of FDD Scell when Pcell is TDD uplink and downlink configuration 1. Therefore, the binding windows of different CCs can not be overlapped completely.
  • the HARQ-ACK information of each scheduled downlink data can be sequenced according to their VCC index and DAI information.
  • VCC data of 3 sub-frames are scheduled, and the DAI thereof is set to be 1, 2 and 3, respectively;
  • the DAI thereof is set to be 1 and 2, respectively;
  • VCC 2 data of 2 sub-frames are scheduled, and the DAI thereof is set to be 1 and 2, respectively.
  • the size of the binding window of VCC is 3
  • the method in which the size of the binding window is 3 and there are 3 CCs can be re-used to feed back the HARQ-ACK information.
  • Fig. 7 illustrates a schematic diagram of another implementation of processing the HARQ-ACK transmission according to an embodiment of the present application.
  • the HARQ-ACK information of data of 5 CCs will be transmitted on the cell 1, and the number of the configured VCCs is 3.
  • 3 VCCs use the same reference HARQ timing, that is, the HARQ timing of FDD Scell when Pcell is TDD uplink and downlink configuration 1 in LTE TDD-FDD CA system. Accordingly, the binding windows of 3 VCCs are overlapped completely. According to the binding window of a VCC, all HARQ-ACK information scheduled in the range of the binding window and corresponding to the VCC data is fed back on the uplink sub-frame corresponding to the binding window. In Fig.
  • the size of the binding window of VCC is 3.
  • data of 2 sub-frames is scheduled, and the DAI thereof is set to be 1 and 2, respectively;
  • data of 3 sub-frames are scheduled, and the DAI thereof is set to be 1, 2 and 3, respectively;
  • data of only 1 sub-frame is scheduled, and the DAI thereof is set to be 1. Then, the method in which the size of the binding window is 3 and there are 3 CCs can be re-used to feed back the HARQ-ACK information.
  • the cross-carrier HARQ transmission is processed based on a mechanism of a combined HARQ process.
  • a component carrier having unlicensed band can be actually used for data transmision only in a period of time, and the more the number of apparatuses participating competition is, the smaller the proportion of time that an apparatus can occupy the channel is. Therefore, from the perspective of the average effect, the amount of data that the apparatus can transmit during a period of time decreases. For example, assuming that the data transmission of a component carrier needs 8 HARQ processes, and when all sub-frames of two component carriers can be scheduled for the same UE, the total number of HARQ processes of the UE is 16. As previously shown in Fig. 4 or Fig.
  • the volume of business of UE is not large, UE will occupy only a portion of the sub-frame resource of each component carrier. That is to say, the proportion of time actually taken by a component carrier for the data transmission of UE is smaller than 1.
  • the HARQ processes which is N times about the number of HARQ processes of a single component carrier are not needed. This problem is not specially solved in the existing CA system.
  • the proportion of time that above N component carriers actually allocates to the UE is small due to occupation of the channel or scheduling of the base station, and so on.
  • a component carrier having unlicensed band can be actually used for data transmision only in a part of time, and the more the number of apparatuses participating competition is, the smaller the proportion of time that an apparatus can occupy the channel is. From the perspective of the average effect on UE side, the amount of data that the UE can transmit during a period of time is reduced.
  • a combined HARQ process can be defined.
  • the CC on which physical channels for the initial transmission and the re-transmission are present may be different, but the initial transmission and the re-transmission of this datus are identified by using the same combined HARQ process.
  • a combined HARQ process ID is transmitted in a DCI format, so as to identify the combined HARQ process corresponding to the datus that is currently scheduled.
  • the number of TBs which each combined HARQ process can carry on a sub-frame of a CC may be 1 or 2.
  • the HARQ initial transmission and the re-transmission for the same data are not limited to one CC any more, instead, they can be mapped to different CCs; UE can conduct HARQ incorporation on the initial transmission and the re-transmission of data of the combined HARQ processes with the same ID when receiving downlink data.
  • configuration information transmitted by a base station to a user terminal indicates that the cross-carrier HARQ transmission is processed based on the combined HARQ process, wherein the user terminal is configured with N component carriers, which are divided into several groups of physical component carriers.
  • a set of the combined HARQ processes is defined on each group of physical component carriers. The initial transmission and the re-transmission of each combined HARQ process of the set can be mapped to different physical component carriers of the corresponding group of physical component carriers.
  • the data transmission identified by a combined HARQ process can be performed on any one component carrier of the corresponding group of physical component carriers defining the set to which the combined HARQ process belongs, and also can be mapped to the same physical component carrier of the corresponding group of physical component carriers, thereby achieving the flexibility of the HARQ transmission.
  • the number of divided groups equals to or larger than 1.
  • Data of a group of CCs is not mapped onto other groups of CCs for HARQ re-transmission.
  • the HARQ-ACK information of data of a group of CCs is mapped onto a sub-frame of a certain CC for transmission.
  • the HARQ initial transmission and re-transmission for the same data identified by using a combined HARQ process identification (ID) are not limited to being one physical component carrier any more, instead, they can be mapped to different CCs of the group of CCs.
  • the total number of combined HARQ processes is smaller than or equals to the sum of the maximum number of HARQ processes calculated individually for each CC.
  • the total number Mg of the combined HARQ processes which need to be received by one UE can be configured by using high layer signaling directly. Or a number k can also be configured to indicate the number C ⁇ k of the combined HARQ processes, where C is a constant, for example, C equals to 8.
  • the HARQ process corresponding to the data transmission can be determined based on the combined HARQ process ID included in downlink control information transmitted by a base station.
  • the base station can pre-inform the group of physical component carriers that is currently used to a user terminal UE. That is to say, in the following transmission, the base station only needs to indicate the combined HARQ process ID, thereby efficiently saving the signaling.
  • the processing of aspects is described with respect to the combined HARQ process defined on one known group of CCs.
  • the number of bits needed to be used in DCI can be determined according to the number M u of currently configured combined HARQ processes. That is to say, the number of bits is .
  • the number M u of combined HARQ processes can be configured by high layer signaling directly.
  • the number of bits needed to be used in DCI is determined according to the maximum number M u-max of combined HARQ procesess needed to be supported. That is to say, the number of bits is .
  • the number of bits so obtained is independent of the number of combined HARQ processes currently and actually configured, therey keeping the number of bits in DCI format unchanged. Due to occupation of channel or scheduling of base station, etc., the above maximum number of combined HARQ process ID needing support is need not be calculated according to the case that all sub-frames of all CCs are simultaneously allocated to the same CC, thus the bit overheads can be reduced.
  • the cross-carrier HARQ transmission can comprise processing soft buffer with respect to each combined HARQ process, respectively.
  • the processing of the soft buffer comprises two parts of contents, that is, rate match and the storage of soft bit. Therefore, processing the soft buffer with respect to each combined HARQ process respectively can comprise at least one of the following items: the rate match is processed according to the maximum number M DL_ uHARQ of HARQ process of one combined HARQ process and the number of TBs supported on one sub-frame of the physical component carrier to which the combined HARQ process is mapped; the soft bit is cached according to the total number of combined HARQ process of N configured physical component carriers and the number of TBs supported on one sub-frame of the physical component carrier to which the combined HARQ process is mapped; and the soft bit is cached according to the number G of the groups of physical component carriers, the number M u of combined HARQ processes of the collection to which a combined HARQ process belongs, and the number of TBs supported on one sub-frame of the physical
  • the maximum number M DL_ uHARQ of HARQ processes of a combined HARQ process can be determined by using a plurality of methods.
  • the base station determines by a high layer signaling transmitted by the base station, wherein the high layer signaling configures the maximum number M DL_ uHARQ of HARQ processes of each combined HARQ process, respectively.
  • the second implementation it is determined by a high layer signaling transmitted by the base station, wherein the high layer signaling configures a maximum number M DL_ uHARQ of HARQ processes, and applies the maximum number M DL_uHARQ of HARQ processes to all combined HARQ processes.
  • the maximum number M DL_ uHARQ of HARQ processes of each combined HARQ process is pre-defined as a fixed value X.
  • the maximum number M DL_ uHARQ of HARQ processes of each combined HARQ process is pre-defined as 8.
  • the maximum number M DL_ uHARQ of HARQ processes of the combined HARQ process is determined according to M DL_ HARQ of the HARQ timing of CC on which the HARQ-ACK transmission is present.
  • soft buffer of each code block in processing rate match, during the processing of date of one corresponding combined HARQ process, soft buffer of each code block can be processed according to M DL_ uHARQ of the combined HARQ processes and the number of TBs. For example, for one combined HARQ process, when the rate match is made for each code block of one TB, the size of the soft buffer of the code block is
  • C is the total number of the code blocks divided by TB
  • K w is the total number of code bits output by a turbo code
  • K MIMO equals to the number of TBs which can be supported by the combined HARQ processes in one sub-frame of one CC
  • K C is a constant related to the capability category of the UE. Therefore, the rate match is conducted for one code block according to the size N cb of the soft buffer.
  • the soft bit cache can be processed according to the combined HARQ processes.
  • the soft buffer can be processed according to the total number M a of the combined HARQ processes of N configured physical component carriers and the number of TBs supported on one sub-frame of the physical component carrier to which the combined HARQ process is mapped. For example, for at least TBs, when decoding of one code block of one TB fails, the number of the soft bits saved at least for the code block is
  • the base station can be based on the above method of saving the soft bit by the UE for the code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on the additional redundance.
  • HARQ IR HARQ re-transmission operation
  • the soft bit can be cached according to the number G of divided groups of physical component carriers (that is, the number G of groups making the combined HARQ operation individually), the number M u of combined HARQ processes of a set to which a combined HARQ process belongs, and the number of TBs supported on one sub-frame of the physical component carrier to which the combined HARQ process is mapped.
  • the number of soft bits saved at least for the code block is
  • M ulim it is the maximum number of combined HARQ processes requiring that UE can save the soft bits simultaneously for a group of CCs carrying out the combined HARQ processes.
  • the soft bits , w k are recorded as one soft bit received by the UE, and k is the smaller index among the indexes of soft bits received by the UE.
  • the base station can be based on the above method of saving the soft bit by the UE for the code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on additional redundance.
  • the number of the combined HARQ processes is generally smaller than the sum of the maximum number of HARQ processes calculated individually by each CC, the number of bits of the soft buffer which can be used by each code block increases, which facilitates improving the link performance of the UE.
  • the feedback can be performed on a level of physical CC according to the existing method, the details of which are omitted here.
  • a component carrier having unlicensed band can be actually used for data transmision only in a period of time, and the more the number of apparatuses participating competition is, the smaller the proportion of time that an apparatus can occupy the channel is. Therefore, from the perspective of the average effect, the amount of data that the apparatus can transmit during a period of time decreases. For example, assuming that the data transmission of a component carrier needs 8 HARQ processes, and when all sub-frames of two component carriers can be scheduled for the same UE, the total number of HARQ processes of the UE is 16. As previously shown in Fig. 4 or Fig.
  • the volume of business of UE is not large, UE will occupy only a portion of the sub-frame resource of each component carrier. That is to say, the proportion of time actually taken by a component carrier for the data transmission of UE is smaller than 1.
  • the HARQ processes which is N times about the number of HARQ processes of a single component carrier are not needed. This problem is not specially solved in the existing CA system.
  • the proportion of time that above N component carriers actually allocates to the UE is small due to occupation of the channel or scheduling of the base station, and so on.
  • a component carrier having unlicensed band can be actually used for data transmision only in a part of time, and the more the number of apparatuses participating competition is, the smaller the proportion of time that an apparatus can occupy the channel is. From the perspective of the average effect on UE side, the amount of data that the UE can transmit during a period of time is reduced.
  • VCC and a combined HARQ process when the soft buffer is processed, it can operate according to the number of component carriers being smller than N, or according to the number of HARQ processes being smaller than the sum of the maximum number of HARQ processes calculated individually by N CCs, thereby the number of bits of the soft buffer which can be used by each code block increases, which facilitates improving the link performance of the UE.
  • These methods of processing the soft buffer are actually independent of VCC or the combined HARQ process, and can also be applied to the case where the cross-carrier HARQ transmission is not used.
  • the above N CCs configured for the UE can be divided into groups, the number of divided groups thereof equals to or larger than 1.
  • the division method can be that CCs of which the reference HARQ timing is identical are divided into a group, for example component carriers operating in the unlicensed band are in a group. This is because the maximum HARQ processes of CCs of which the reference HARQ timing is identical are the same, therefore it more facilitate sharing of the soft bit cache among CCs. This is because the maximum HARQ processes of CCs of which the reference HARQ timing is identical are the same, therefore it is more facilitate for the soft bit cache being shared among CCs implementally.
  • the present invention does not limit particular division methods.
  • the amount of data that UE needs to receive during a period of time decreases due to occupation of the channel or scheduling of the base station, and so on, that is, the total number of HARQ processes used by UE is generally smaller than or equals to the sum of the maximum number of HARQ processes calculated individually by each CC, or the total number of TBs received by UE is generally smaller than or equals to the sum of the number of TBs calculated individually by each CC.
  • the number of TBs of the downlink transmission mode of each CC is T k
  • the processing of the soft buffer comprises two parts of contents, that is, rate match and storage of soft bit.
  • the maximum number M vDL_HARQ of HARQ processes of parameters can be used, a method of determining the correct M vDL _ HARQ will be described below.
  • the maximum number M vDL_HARQ of HARQ processes is configured by high layer signalings respectively and applied to all data transmission of the group of CCs.
  • M vDL _ HARQ equals to the maximum number of HARQ processes determined according to a reference HARQ timing thereof.
  • the maximum number M vDL _ HARQ of HARQ processes can also be configured by high layer signalings and applied to all data transmission of N CCs.
  • the maximum number M vDL _ HARQ of HARQ processes is pre-defined as a fixed value and applied to the HARQ processes of N CCs.
  • M vDL _ HARQ equals to 8
  • M vDL _ HARQ is an integer less than 8.
  • M vDL _ HARQ can equal to the maximum number of HARQ processes determined according to a reference HARQ timing of the CC where data transmission exists.
  • M vDL_HARQ of different CCs can be different.
  • the methods for determing M vDL _ HARQ corresponding to two operations may be the same, or be different.
  • soft buffer of each code block in processing rate match, for a TB, soft buffer of each code block can be processed according to the corresponding maximum number M vDL _ HARQ of HARQ processes thereof and the number of TBs. For example, by using the above fourth method for determing M vDL _ HARQ , the method of the current CA system for processing rate match is kept. For example, when the rate match is made for each code block of a TB, the size of the soft buffer of the code block is
  • C is total number of code blocks divided by TB
  • K w is total number of code bits output by a turbo code
  • K MIMO equals to the number of TBs which can be supported by the sub-frmae of CC where data transmission exists
  • M lim it is a constant, for example 8
  • K C is a constant related to the capability category of the UE.
  • TBs or HARQ processes of which the soft buffer is smaller can be assumed to need only, thereby the number of bits of the soft buffer which can be used by each code block increases, which facilitates improving the link performance of the UE.
  • the first method is to process the soft bit cache for a group of CCs according to V g CCs.
  • the group of CCs is processed according to the number of HARQ processes of V g CCs, and for the CC which is not configured with the equivalent number of component carriers, it is still an independent CC and processed according to the number of HARQ processes itself.
  • the base station still can schedule data transmission on any one of the group of CCs, when burst errors occur, UE can not cache soft bit information of all HARQ processes.
  • Vg may be configured by high layer signaling, or is predetermined.
  • the soft buffer can be processed according to the sum V a of the equivalent number of component carriers corresponding to N component carriers, the maximum number M vDL_HARQ of HARQ processes of the CC, and the number of TBs supported on a sub-frame of the CC.
  • V a is accumulated to be cauculated, for the group of CCs which are configured with the above equivalent number V g of component carriers, the number for accumulation is V g ; for the CC which is not configured with the equivalent number of component carriers, the number for accumulation is one.
  • Va equals to the number Vg of equivalent CCs of this group of CCs.
  • UE can equally divide the soft buffer according to the equivalent number V a of component carriers for processing the soft bit cache, for Va CCs, when the decoding of a code block of a TB fails, for at least TBs of one CC, the number of the soft bits saved at least for the code block is
  • the soft bits , w k are recorded as a soft bit received by the UE, and k is the smaller index among the indexes of soft bits received by the UE.
  • the base station can be based on above method in which UE saves a soft bit for a code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on the additional redundance.
  • HARQ IR HARQ re-transmission operation
  • the second method is to process the soft bit cache for a group of CCs according to the fact that a sub-frame includes Tg TBs.
  • a group of CCs if they are configured with the above equivalent number of TBs, the number of TBs determined respectively by the transmission mode of a CC, that is the above parameter K MIMO , is not any longer used upon processing the soft buffer, instead for the group of CCs, they are processed according to T g TBs included in a sub-frame; and for the CC which is not configured with the equivalent number of TBs, it is still an independent CC and processed according to the number of TBs determined by the transmission mode itself, that is K MIMO .
  • Tg may be configured by high layer signaling, or is predetermined.
  • the soft buffer can be processed according to the sum T a of the equivalent number of TBs corresponding to N component carriers for processing the soft bit cache in a sub-frame, and the maximum number M vDL _ HARQ of HARQ processes of the CC.
  • T a is accumulated to be cauculated, for the group of CCs which are configured with the above equivalent number T g of TBs, the number for accumulation is T g ; for the CC which is not configured with the equivalent number of TBs, the number for accumulation is K MIMO of the CC.
  • Ta equals to the total number Tg of equivalent TBs of this group of CCs in one sub-frame.
  • UE can equally divide the soft buffer according to the equivalent number T a of TBs for processing the soft bit cache, for a group of CCs, according to the equivalent number T g of TBs thereof, when the decoding of a code block of a TB fails, for at least TBs, the number of the soft bits saved at least for the code block is
  • the soft bits , w k are recorded as a soft bit received by the UE, and k is the smaller index among the indexes of soft bits received by the UE.
  • the base station can be based on above method in which UE saves a soft bit for a code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on the additional redundance.
  • HARQ IR HARQ re-transmission operation
  • the value of is the same for a group of CCs, thus for this group of CCs, it is required to ensure that the number of cached TBs is constant, and the soft cache can be processed by UE accordingly.
  • the number of bits of the soft buffer which can be used by each code block increases because the equivalent number of TBs is generally smaller than the total number of TBs of the transmission mode configuring UE in a sub-frame, and this facilitates improving the link performance of the UE.
  • the third method is to process the soft bit cache for a group of CCs according to M g HARQ processes.
  • the group of CCs are processed according to M g HARQ processes; and for the CC which is not configured with the equivalent number of HARQ processes, it is still an independent CC and processed according to the maximum number of HARQ processes itself.
  • the base station still can schedule data transmission on any one sub-frame on any one of the group of CCs, when burst errors occur, UE can not cache soft bit information more than M g HARQ processes.
  • the soft buffer can be processed according to the total sum M a of the equivalent number of HARQ processes of configured N component carriers for processing the soft bit cache, and the number of TBs supported on a sub-frame of the CC where data transmission exists.
  • M a is accumulated to be cauculated
  • the number for accumulation is M g
  • the number for accumulation is M cDL _ HARQ is the maximum number of HARQ processes of the CC.
  • Ma equals to the number Mg of equivalent HARQ processes of this group of CCs.
  • the number of the soft bits saved at least for the code block is
  • the soft bits , w k are recorded as a soft bit received by the UE, and k is the smaller index among the indexes of soft bits received by the UE.
  • the base station can be based on above method in which UE saves a soft bit for a code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on the additional redundance.
  • HARQ IR HARQ re-transmission operation
  • the soft bits can be cached according to the group number G of the divided groups of physical component carriers, and the equivalent number M g of HARQ processes in a group for processing the soft bit cache, and the number of TBs supported on a sub-frame of the CC where data transmission exists. That is, the total soft bit display is equally divided into G components, then each component is further distributed to M g parallel HARQ processes in the group.
  • the number of the soft bits saved at least for the code block is
  • the base station can be based on above method in which UE saves a soft bit for a code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on the additional redundance.
  • HARQ IR HARQ re-transmission operation
  • the number of bits of the soft buffer which can be used by each code block increases because the equivelant number of HARQ processes is generally smaller than the sum of the maximum number of HARQ processes calculated individually for each CC, and this facilitates improving the link performance of the UE.
  • the fourth method is to process the soft bit cache for a group of CCs according to Bg TBs.
  • the group of CCs is processed according to B g TBs; and for the CC which is not configured with the equivalent number of TBs, it is still an independent CC and processed according to the number of TBs itself, that is , and K MIMO is the number of TBs for the transmission mode of the CC, M cDL _ HARQ is the maximum number of HARQ processes of the CC.
  • UE can not cache soft bit information more than B g TBs.
  • the soft buffer can be processed according to the sum B a of the equivalent number of TBs of configured N component carriers for processing the soft bit cache.
  • B a is accumulated to be cauculated
  • the number for accumulation is B g ;
  • the number for accumulation is , and
  • M cDL _ HARQ is the maximum number of HARQ processes of the CC.
  • Ba equals to the number Bg of equivalent TBs of this group of CCs.
  • the soft bits , w k are recorded as a soft bit received by the UE, and k is the smaller index among the indexes of soft bits received by the UE.
  • the base station can be based on above method in which UE saves a soft bit for a code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on the additional redundance.
  • HARQ IR HARQ re-transmission operation
  • the soft bits can be cached according to the group number G of the divided groups of physical component carriers, and the equivalent number B g of TBs in a group for processing the soft bit cache. That is, the total soft bit display is equally divided into G components, then each component is further distributed to B g TBs in the group.
  • the number of the soft bits saved at least for the code block is
  • the soft bits , w k are recorded as a soft bit received by the UE, and k is the smaller index among the indexes of soft bits received by the UE.
  • the base station can be based on above method in which UE saves a soft bit for a code block, thereby optimizing the HARQ re-transmission operation (HARQ IR) based on the additional redundance.
  • HARQ IR HARQ re-transmission operation
  • the number of bits of the soft buffer which can be used by each code block increases because the equivelant number of TBs is generally smaller than the sum of the number of TBs calculated individually for each CC, and this facilitates improving the link performance of the UE.
  • Fig. 8 illustrates a schematic block diagram of a physical apparatus 800 suitable to implement the exemplary embodiments of the present application.
  • the physical apparatus 800 can be configured as a network side appatatus, such as a base station.
  • the physical apparatus 800 can also be configured as a user side appatatus, such as a user terminal.
  • the physical apparatus 800 comprise a processor 801, a memory 802 coupled to the processor 801, and a suitable radio frequency (RF) transmitter and receiver 804 coupled to the processor 801.
  • the memory 802 stores program 803.
  • the transmitter/receiver 804 is suitable for two-way wireless communication. It is noted that, the transmitter/receiver 804 has at least one antenna for assiting communication. In practice, the base station or UE may have a plurality of antennas.
  • the physical apparatus 800 may be coupled to one or more external networks or systems, such as internetworks, through a data path.
  • the program 803 can include program instructions. When these program instructions are executed by an associated processor 801, they make the physical apparatus 800 operate according to the exemplary embodiments of the present application.
  • the embodiments of the present application can be implemented by the computer software which can be executed by the processor 801 of the physical apparatus 800, or by the hardware, or by the combination of the software and the hardware.
  • the memory 802 can be any memories of suitable type which are suitable for the local technical environment, and can be implemented by using any suitable data storage technologies, such as storage apparatus and system based on semiconductor, magnetic storage apparatus and system, optical storage apparatus and system, and fixed storage and mobile storage, which are only non-limiting examples. Although only one memory is illustrated in the physical apparatus 800, a plurality of memory cells which are physically individual may be present in the physical apparatus 800.
  • the processor 801 may be any processors of suitable type which are suitable for the local technical environment, and may include one or more of the following items: general purpose computer, dedicated computer, micro-processor, digital signal processor (DSP), and processor based on architecture of multi-core processor, which are only non-limiting examples.
  • the receiver of the transmitter/receiver 804 is configured to receive configuration information of a cross-carrier HARQ transmission from a base station. Particularly, during the cross-carrier HARQ transmission, an initial transmission and a re-transmission of the same HARQ process can be performed on different physical component carriers.
  • the receiver of the transmitter/receiver 804 is also configured to receive downlink control information from the base station.
  • the downlink control information include control information for the cross-carrier HARQ transmission.
  • the processor 801 is configured to control the transmitter/receiver 804 to perform the HARQ transmission according to the configuration information and the downlink control information.
  • the processor 801 is configured to determine configuration information of the cross-carrier HARQ transmission. Particularly, during the cross-carrier HARQ transmission, an initial transmission and a re-transmission of the same HARQ process may be performed on different physical component carriers.
  • the transmitter of the transmitter/receiver 804 is configured to transmit the configuration information of the cross-carrier HARQ transmission to a communication apparatus.
  • the transmitter of the transmitter/receiver 804 is also configured to transmit the downlink control information to the communication apparatus.
  • the processor 801 is also configured to control the transmitter/receiver 804 to perform the HARQ transmission according to the configuration information and the downlink control information.
  • the present application also provides a computer readable storage medium, which may be a computer readable storage medium included in the base station or the communication apparatus of the above embodiments or a computer readable storage medium which is present individually and not aseembled in the apparatus.
  • the computer readable storage medium is stored with one or more programs, which are used by one or more processors to execute cellular access method dercirbed in the present application.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un appareil de transmission d'une demande automatique de répétition hybride (HARQ). Un mode de réalisation du procédé de transmission HARQ pour l'appareil de communication consiste à : recevoir des informations de configuration relatives à une transmission HARQ entre porteuses, d'une station de base, une transmission initiale et une retransmission de la transmission HARQ pouvant être traitées sur différentes composantes porteuses physiques; recevoir des informations de commande de liaison descendante, de la station de base, les informations de commande de liaison descendante comprenant des informations de commande pour la transmission HARQ entre porteuses; et exécuter la transmission HARQ entre porteuses d'après les informations de configuration et les informations de commande de liaison descendante. Les modes de réalisation de la présente invention permettent d'exécuter la transmission HARQ pour les mêmes données sur une pluralité de composantes porteuses physiques, et d'améliorer ainsi l'efficacité de la transmission HARQ.
PCT/KR2015/014324 2014-12-26 2015-12-28 Procédé et appareil de transmission de demande automatique de répétition hybride Ceased WO2016105173A1 (fr)

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CN201510680469.9A CN105743619B (zh) 2014-12-26 2015-10-19 混合自动重传请求(harq)传输的方法和设备

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US11303392B2 (en) 2017-03-16 2022-04-12 Qualcomm Incorporated Multi-HARQ methods and apparatus for codeblock group based transmissions
US10694514B2 (en) 2017-08-10 2020-06-23 At&T Intellectual Property I, L.P. Adaptive two-stage downlink control channel structure for code block group based fifth generation (5G) or other next generation systems
US11356994B2 (en) 2017-08-10 2022-06-07 At&T Intellectual Property I, L.P. Adaptive two-stage downlink control channel structure for code block group based fifth generation (5G) or other next generation systems
US10420089B2 (en) 2017-08-10 2019-09-17 At&T Intellectual Property I, L.P. Adaptive two-stage downlink control channel structure for code block group based fifth generation (5G) or other next generation systems
WO2019028917A1 (fr) * 2017-08-11 2019-02-14 华为技术有限公司 Procédé et appareil de rétroaction de données de liaison montante
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CN111164922A (zh) * 2017-09-29 2020-05-15 联想(北京)有限公司 具有指示与数据块相对应的反馈信息的序列的反馈消息
US11558305B2 (en) * 2018-04-16 2023-01-17 Huawei Technologies Co., Ltd. Rate matching method and apparatus, and rate de-matching method and apparatus
CN115104277B (zh) * 2020-02-12 2024-04-05 苹果公司 用于无线通信中的多分量载波物理下行链路共享信道调度的方法和装置

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