CN107294685B - Communication method when TTI length of UL transmission and TTI length of DL transmission are asymmetric - Google Patents

Communication method when TTI length of UL transmission and TTI length of DL transmission are asymmetric Download PDF

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CN107294685B
CN107294685B CN201610204130.6A CN201610204130A CN107294685B CN 107294685 B CN107294685 B CN 107294685B CN 201610204130 A CN201610204130 A CN 201610204130A CN 107294685 B CN107294685 B CN 107294685B
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transmission
tti
timing
determining
ack
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CN107294685A (en
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骆喆
武卓
王钧
沈钢
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Alcatel Lucent SAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Embodiments of the present disclosure provide methods and related devices for when TTI lengths for UL and DL transmissions are asymmetric. The method comprises the following steps: determining at least one of a timing relationship between downlink DL transmissions and corresponding uplink UL transmissions and a timing relationship between UL transmissions and corresponding DL transmissions; performing at least one of an UL transmission corresponding to the DL transmission and a DL transmission corresponding to the UL transmission according to the determined timing relationship; wherein a length of a transmission time interval, TTI, of a UL transmission and a length of a TTI of a DL transmission in the frequency division duplex communication are set to be asymmetric.

Description

Communication method when TTI length of UL transmission and TTI length of DL transmission are asymmetric
Technical Field
Embodiments of the present disclosure relate to communication methods and apparatus, and in particular, to methods and apparatus for frequency division duplex communication when TTI lengths of UL and DL transmissions are asymmetric.
Background
In a recent 3 rd generation partnership project (3GPP) discussion, a discussion on reducing latency has been introduced at the 67 th conference at 3GPP TSG RAN. The delay of packet data is not only critical to the perception of system response; but also parameters that directly affect throughput, demand for buffering, reliable transmission, and quality of experience for various applications. Currently, in order to reduce the delay of packet data, a shortened Transmission Time Interval (TTI) has been introduced and has been discussed since the 83 th conference of 3GPP TSGRAN WG 1.
In view of backward compatibility, a User Equipment (UE) should simultaneously support a plurality of TTI lengths (including at least a legacy TTI length and a shortened TTI length). In some cases, the UE may operate at different Uplink (UL) TTI lengths and Downlink (DL) TTI lengths simultaneously. This situation is already agreed on at the 84 th meeting at 3GPP TSG RAN WG 1. For example, such situations specifically include:
● to solve the coverage problem, the UE has to use a longer TTI length for UL transmissions, although the TTI length for DL transmissions is short.
● to address the issue of evolved node B (eNB) scheduling, the UE uses the conventional TTI length of DL transmissions, although the TTI length of UL transmissions is shortened.
● for feedback of multiple positive acknowledgements/negative acknowledgements (ACK/NACK) for DL/UL transmissions having multiple TTI lengths, the same TTI length is employed.
● aggregate multiple Component Carriers (CCs) with different TTI lengths.
Since the timing related to the conventional design is based on the assumption that UL and DL transmissions use the same TTI length, a new design related to the timing required in the case where the TTI lengths of UL and DL transmissions are not symmetrical is required.
Fig. 1 shows the required timing relationship between the required UL/DL transmission process and its corresponding hybrid automatic repeat request (HARQ) process.
There are three related timing relationships between the UL transmission process and its corresponding HARQ process:
● timing between UL scheduling grant and UL transmission (first timing U1)
● timing between UL transmissions and ACK/NACK (second timing U2)
● timing between ACK/NACK and UL retransmissions (third timing U3)
Two related timing relationships are included between DL transmission processes and their corresponding HARQ processes:
● timing between DL transmission and ACK/NACK (fourth timing D1)
● timing between ACK/NACK and DL retransmission (fifth timing D2)
The existing corresponding timing relationship between the UL transmission process and its corresponding HARQ process used for FDD mode is shown in fig. 2. As shown in fig. 2, the following timing relationships are specifically included:
first timing U1: when the UE receives Downlink Control Information (DCI) of the UL scheduling grant at the nth subframe, the UE will transmit data on a Physical Uplink Shared Channel (PUSCH) at the (n + 4) th subframe.
Second timing U2: when the UE transmits data on the PUSCH on the nth subframe, the UE will expect a physical hybrid automatic repeat request indicator channel (PHICH) or UL scheduling grant indicating retransmission on the n +4 th subframe.
Third timing U3: when the UE receives DCI on the nth subframe indicating a retransmitted PHICH or UL scheduling grant, the UE will retransmit the data on the PUSCH on the n +4 th subframe.
The existing corresponding timing relationship between DL transmission processes and their corresponding HARQ processes used for FDD mode is shown in fig. 3. As shown in fig. 3, the following timing relationships are specifically included:
fourth timing D1: when the UE receives data on the Physical Downlink Shared Channel (PDSCH) on the nth subframe, the UE will send ACK/NACK feedback on the physical uplink control channel PUCCH (or PUCCH-like PUSCH) on the n +4 th subframe.
Fifth timing D2: when the eNB receives ACK/NACK feedback on the nth subframe, the eNB will retransmit the data on the PDSCH on the mth subframe, where m > -n + 4.
To date, there has been no clear solution for the timing relationship in the case where the TTI lengths of UL and DL transmissions are asymmetric. In the present disclosure, a new timing design in case of asymmetric TTI lengths of UL and DL transmissions used in Frequency Division Duplex (FDD) mode will be provided.
Accordingly, the present disclosure proposes methods and apparatus for frequency division duplex communication when TTI lengths for UL and DL transmissions are asymmetric, using a new timing design that achieves the design goals of reducing system delay currently proposed by 3 GPP.
Disclosure of Invention
According to an aspect of the present disclosure, a method for frequency division duplex communication is presented, comprising: determining at least one of a timing relationship between downlink DL transmissions and corresponding uplink UL transmissions and a timing relationship between UL transmissions and corresponding DL transmissions; performing at least one of an UL transmission corresponding to the DL transmission and a DL transmission corresponding to the UL transmission according to the determined timing relationship; wherein a length of a transmission time interval, TTI, of a UL transmission and a length of a TTI of a DL transmission in the frequency division duplex communication are set to be asymmetric.
According to an embodiment of the present disclosure, the method further comprises: changing a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication.
According to an embodiment of the present disclosure, the method further comprises: determining a timing relationship between the DL transmissions and corresponding UL transmissions using at least one selected from the following: (a) for the TTI of the nth DL transmission, selecting as the reference point the TTI of the first one of the UL transmissions numbered m that starts after or at the end of the TTI of the nth DL transmission, and determining the TTI of the m + k UL transmissions as the TTI corresponding to the TTI of the nth DL transmission for which the UL transmission of the respective UL transmission is to take place; (b) for the TTI of the nth DL transmission, selecting a last TTI of the UL transmission numbered m that starts completely before the end of the TTI of the nth DL transmission as a reference point, and determining the TTI of the m + k UL transmissions as the TTI of the UL transmission corresponding to the TTI of the nth DL transmission for the corresponding UL transmission; (c) taking an end of a TTI of a DL transmission at an x-th orthogonal frequency division multiplexing symbol, OS, as a reference point, and determining an x + k-th OS as a starting position of a TTI of a UL transmission corresponding to the TTI of the DL transmission for which the corresponding UL transmission is made; (d) selecting a TTI of an nth DL transmission as a reference point, and taking a TTI of a first UL transmission that begins after an end of a TTI of an n + k DL transmission as a TTI, corresponding to the TTI of the nth DL transmission, for UL transmission of the respective UL transmission; and, (e) selecting the TTI of the nth DL transmission as the reference point, and taking the TTI of the first UL transmission that starts after or at the beginning of the TTI of the (n + k) th DL transmission as the TTI of the UL transmission corresponding to the nth DL transmission for which the corresponding UL transmission is made.
According to an embodiment of the present disclosure, the method further comprises: in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication: calculating a reference point according to the length of the changed TTI and using one of the manners (a) - (c) to determine a timing relationship between the DL transmission and a corresponding UL transmission; alternatively, one of the manners (d) - (e) is used to determine the timing relationship between the DL transmission and the corresponding UL transmission.
According to an embodiment of the present disclosure, the method further comprises: determining a timing relationship between the UL transmission and a corresponding DL transmission using at least one selected from the following: (f) for the mth TTI of the UL transmission, selecting as the reference point the TTI of the first N-numbered DL transmission that begins after or at the end of the mth TTI, and determining the TTI of the (n + k) -th DL transmission as the TTI corresponding to the mth TTI of the UL transmission for the DL transmission for which the respective DL transmission is made; (g) for the mth TTI of UL transmission, selecting a last TTI of the DL transmission numbered n starting completely before the end of the mth TTI of UL transmission as a reference point, and determining the TTI of the n + k DL transmissions as the TTI corresponding to the mth TTI of UL transmission for the DL transmission of the corresponding DL transmission; (h) taking an end of a TTI of a UL transmission at an x-th OS as a reference point, and determining an x + k-th OS as a start position of a TTI of a DL transmission for the DL transmission corresponding to the TTI of the UL transmission; (i) selecting a TTI of an mth UL transmission as a reference point, and taking a TTI of a first DL transmission that starts after an end of a TTI of an m + k UL transmission as a TTI, corresponding to the TTI of the mth UL transmission, for a DL transmission of the respective DL transmission; and, (j) selecting a TTI of the mth UL transmission as the reference point, and taking a TTI of a first DL transmission that starts after or at the start of a TTI of the m + k UL transmissions as a TTI of the DL transmission corresponding to the mth UL transmission for the corresponding DL transmission.
According to an embodiment of the present disclosure, the method further comprises: in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication: calculating a reference point according to the length of the changed TTI and using one of the manners (f) - (h) to determine a timing relationship between the UL transmission and the corresponding DL transmission; alternatively, one of the manners (i) - (j) is used to determine the timing relationship between the UL transmission and the corresponding DL transmission.
According to an embodiment of the present disclosure, in the method, determining a timing relationship between the DL transmissions and the respective UL transmissions comprises: determining at least one of the following timings: (k) a first timing U1 between a first UL scheduling grant in the DL transmissions and the corresponding UL transmission; (l) A third timing U3 between positive acknowledgement/negative acknowledgement (ACK/NACK) in the DL transmission for the respective UL transmission and UL retransmissions; and, (m) a fourth timing D1 between data transmission in the DL transmission and ACK/NACK feedback for the corresponding DL transmission.
According to an embodiment of the present disclosure, in the method, determining a timing relationship between the UL transmissions and the corresponding DL transmissions comprises: determining a second timing U2 between the UL transmission and ACK/NACK feedback for the UL transmission.
According to an embodiment of the present disclosure, in the method, determining at least one of the timings (k) - (m) includes: (n) determining the first timing U1 according to one of the following: for asynchronous UL scheduling grants, determining the first timing U1 by an indicator of the first timing U1 contained in downlink control information, DCI, of the first UL scheduling grant for the corresponding UL transmission using an explicit notification mode, the indicator indicating an uplink index of the corresponding UL transmission, the uplink index indicating a value of an interval to which the first timing U1 corresponds; and, for a synchronized UL scheduling grant, determining the first timing U1 using an implicit notification mode, wherein a value of the interval to which the first timing U1 corresponds is predefined according to a length of a TTI of the UL/DL transmission, (o) determining the third timing U3 according to one of: for asynchronous UL retransmissions, determining the third timing U3 by an indicator of the third timing U3 contained in DCI of the ACK/NACK for the corresponding UL transmission using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmissions, the uplink index indicating a value of an interval to which the third timing U3 corresponds; for asynchronous UL retransmissions, when there is only the pure ACK/NACK feedback for the corresponding UL transmission, determining the third timing U3 by an indicator of the third timing U3 included in the pure ACK/NACK feedback using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmission, the uplink index indicating a value of an interval to which the third timing U3 corresponds; for asynchronous UL retransmissions, determining the third timing U3 by the indicator of the third timing U3 contained in DCI of the first UL scheduling grant using an explicit notification mode when there is only the ACK/NACK feedback for the corresponding UL transmission; and, for synchronized UL retransmissions, determining the third timing U3 using an implicit notification pattern, wherein a value of an interval corresponding to the third timing U3 is predefined according to a length of a TTI of the UL/DL transmission, (p) determining the fourth timing D1 according to one of: for ACK/NACK feedback of asynchronous DL transmissions, determining the fourth timing D1 by an indicator of the fourth timing D1 included in DCI of a scheduling grant of a DL transmission using an explicit notification mode, the indicator indicating an uplink index of the ACK/NACK of the corresponding DL transmission, the uplink index indicating a value of an interval corresponding to the fourth timing D1; and determining the fourth timing D1 using an implicit notification mode for ACK/NACK feedback for the synchronized DL transmission, wherein a value of an interval corresponding to the fourth timing D1 is predefined according to a length of a TTI of the UL/DL transmission.
According to an embodiment of the present disclosure, in the method, determining the second timing U2 further includes: determining the second timing U2 according to one of the following: for ACK/NACK feedback of asynchronous UL transmissions, determining the second timing U2 through DCI of a second UL scheduling grant, the DCI being used to determine whether retransmission is required, the user equipment obtaining the DCI by blind decoding a TTI of each DL transmission, the DCI including an indicator of an identifier of a UL hybrid automatic repeat request process; for ACK/NACK feedback of asynchronous UL transmissions, determining the second timing U2 by an indicator of the second timing U2 contained in DCI of the first UL scheduling grant using an explicit notification mode, the indicator to indicate a downlink index of the corresponding DL transmission, the downlink index indicating a value of an interval to which the second timing U2 corresponds; and determining the second timing U2 using an implicit notification mode for ACK/NACK feedback for a synchronized UL transmission, wherein a value of an interval corresponding to the second timing U2 is predefined according to a length of a TTI of the UL/DL transmission.
According to an embodiment of the present disclosure, in the method, determining the third timing U3 by an indicator of the third timing U3 contained in the pure ACK/NACK feedback using an explicit notification mode when only the pure ACK/NACK feedback for the corresponding UL transmission exists for asynchronous UL retransmissions comprises: the indicator of the third timing U3 included in the pure ACK/NACK feedback uses one of an orthogonal mask sequence, a phase rotation sequence, or a start position of a pseudo random sequence.
According to an embodiment of the present disclosure, in the method, determining the third timing U3 using implicit notification mode for synchronized UL retransmissions further comprises: when the ACK/NACK feedback of the asynchronous DL transmission is a pure ACK/NACK feedback, an offset indicator of a value of an interval to which the third timing U3 corresponds, using one of a start position of an orthogonal mask sequence, a phase rotation sequence, or a pseudo random sequence as a value of an interval to which the third timing U3 corresponds, is used to determine an offset of a value of an interval to which the third timing U3 corresponds.
According to an embodiment of the present disclosure, in the method, notifying the first timing U1 using an implicit notification mode for the synchronized UL scheduling grant comprises: determining an offset value for the first timing U1 by an offset indicator used in DCI for the synchronized UL scheduling grant, the offset indicator indicating an uplink index offset indicating an offset value for the first timing U1; alternatively, the offset value for the first timing U1 is determined by an indicator of resources of the allocated TTIs of the plurality of UL transmissions in the DCI for the synchronized UL scheduling grant.
According to an embodiment of the present disclosure, in the method, determining the fourth timing D1 using an implicit notification pattern for ACK/NACK feedback of the synchronized DL transmission further comprises at least one of: using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of TTIs of different DL transmissions, and including an indicator of the frequency offset in DCI of a scheduling grant for indicating a frequency offset index of a physical uplink control channel, or a numerical value of an interval corresponding to the fourth timing D1 may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the DL transmission; using orthogonal multiplexing for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of DL transmission, indexing an indicator included in DCI of a scheduling grant of DL transmission using an orthogonal mask sequence, or predefining a numerical value of an interval corresponding to the fourth timing D1 according to a length of TTI of the UL/DL transmission and a number of TTI of the DL transmission; and the plurality of ACK/NACK feedbacks for the TTIs of the plurality of different DL transmissions comprise a combined feedback, a downlink allocation index is used in the DCI of the scheduling grant of the DL transmission, the downlink allocation index indicating a location of the respective ACK/NACK feedback in the combined feedback.
According to an embodiment of the present disclosure, in the method, determining the second timing U2 using an implicit notification mode for ACK/NACK feedback of the synchronized UL transmission further comprises at least one of: using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of UL transmission, and determining the second timing U2 by including an indicator of the frequency offset in DCI of a UL scheduling grant, the indicator for indicating a frequency offset index of a physical hybrid automatic repeat request indication channel, or a value of an interval corresponding to the second timing U2 may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the UL transmission, or a value of an interval corresponding to the second timing U2 may be detected by blind decoding; determining the second timing U2 using orthogonal multiplexing for a plurality of ACK/NACK feedbacks for a plurality of TTIs for a plurality of different UL transmissions, using an orthogonal mask sequence to index an indicator included in a DCI of a UL scheduling grant, or a numerical value of an interval corresponding to the second timing U2 predefined according to a length of a TTI of the UL/DL transmission and a number of the TTI of the UL transmission; and the plurality of ACK/NACK feedbacks for the TTIs of the plurality of different UL transmissions comprise a combined feedback, and an uplink allocation index is used in the DCI of the UL scheduling grant for indicating a location of the respective ACK/NACK feedback in the combined feedback.
According to another aspect of the present disclosure, there is also presented an apparatus for frequency division duplex communication, the apparatus comprising: a determining means configured to determine at least one of a timing relationship between downlink DL transmissions and corresponding uplink UL transmissions and a timing relationship between UL transmissions and corresponding DL transmissions; an execution device configured to execute at least one of a UL transmission corresponding to the DL transmission and a DL transmission corresponding to the UL transmission according to the determined timing relationship; wherein a length of a transmission time interval, TTI, of a UL transmission and a length of a TTI of a DL transmission in the frequency division duplex communication are set to be asymmetric.
According to an embodiment of the present disclosure, the apparatus further comprises: a setting device configured to change a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication.
According to an embodiment of the present disclosure, the apparatus further comprises: a first selection device configured to determine a timing relationship between the DL transmissions and corresponding UL transmissions using at least one selected from the following: (a) for the TTI of the nth DL transmission, selecting as the reference point the TTI of the first one of the UL transmissions numbered m that starts after or at the end of the TTI of the nth DL transmission, and determining the TTI of the m + k UL transmissions as the TTI corresponding to the TTI of the nth DL transmission for which the UL transmission of the respective UL transmission is to take place; (b) for the TTI of the nth DL transmission, selecting a last TTI of the UL transmission numbered m that starts completely before the end of the TTI of the nth DL transmission as a reference point, and determining the TTI of the m + k UL transmissions as the TTI of the UL transmission corresponding to the TTI of the nth DL transmission for the corresponding UL transmission; (c) taking an end of a TTI of a DL transmission at an x-th orthogonal frequency division multiplexing symbol, OS, as a reference point, and determining an x + k-th OS as a starting position of a TTI of a UL transmission corresponding to the TTI of the DL transmission for which the corresponding UL transmission is made; (d) selecting a TTI of an nth DL transmission as a reference point, and taking a TTI of a first UL transmission that begins after an end of a TTI of an n + k DL transmission as a TTI, corresponding to the TTI of the nth DL transmission, for UL transmission of the respective UL transmission; and, (e) selecting the TTI of the nth DL transmission as the reference point, and taking the TTI of the first UL transmission that starts after or at the beginning of the TTI of the (n + k) th DL transmission as the TTI of the UL transmission corresponding to the nth DL transmission for which the corresponding UL transmission is made.
According to an embodiment of the present disclosure, the apparatus further comprises: a second selection device configured to, in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication: calculating a reference point according to the length of the changed TTI and using one of the manners (a) - (c) to determine a timing relationship between the DL transmission and a corresponding UL transmission; alternatively, one of the manners (d) - (e) is used to determine the timing relationship between the DL transmission and the corresponding UL transmission.
According to an embodiment of the present disclosure, the apparatus further comprises: a third selecting means configured to determine a timing relationship between the UL transmission and a corresponding DL transmission using at least one selected from the following: (f) for the mth TTI of the UL transmission, selecting as the reference point the TTI of the first N-numbered DL transmission that begins after or at the end of the mth TTI, and determining the TTI of the (n + k) -th DL transmission as the TTI corresponding to the mth TTI of the UL transmission for the DL transmission for which the respective DL transmission is made; (g) for the mth TTI of UL transmission, selecting a last TTI of the DL transmission numbered n starting completely before the end of the mth TTI of UL transmission as a reference point, and determining the TTI of the n + k DL transmissions as the TTI corresponding to the mth TTI of UL transmission for the DL transmission of the corresponding DL transmission; (h) taking an end of a TTI of a UL transmission at an x-th OS as a reference point, and determining an x + k-th OS as a start position of a TTI of a DL transmission for the DL transmission corresponding to the TTI of the UL transmission; (i) selecting a TTI of an mth UL transmission as a reference point, and taking a TTI of a first DL transmission that starts after an end of a TTI of an m + k UL transmission as a TTI, corresponding to the TTI of the mth UL transmission, for a DL transmission of the respective DL transmission; and, (j) selecting a TTI of the mth UL transmission as the reference point, and taking a TTI of a first DL transmission that starts after or at the start of a TTI of the m + k UL transmissions as a TTI of the DL transmission corresponding to the mth UL transmission for the corresponding DL transmission.
According to an embodiment of the present disclosure, the apparatus further comprises: a fourth selection means configured to, in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication: calculating a reference point according to the length of the changed TTI and using one of the manners (f) - (h) to determine a timing relationship between the UL transmission and the corresponding DL transmission; alternatively, one of the manners (i) - (j) is used to determine the timing relationship between the UL transmission and the corresponding DL transmission.
According to an embodiment of the present disclosure, determining a timing relationship between the DL transmissions and the corresponding UL transmissions comprises: determining at least one of the following timings: (k) a first timing U1 between a first UL scheduling grant in the DL transmissions and the corresponding UL transmission; (l) A third timing U3 between positive acknowledgement/negative acknowledgement (ACK/NACK) in the DL transmission for the respective UL transmission and UL retransmissions; and, (m) a fourth timing D1 between data transmission in the DL transmission and ACK/NACK feedback for the corresponding DL transmission.
According to an embodiment of the present disclosure, determining a timing relationship between the UL transmission and the corresponding DL transmission comprises: determining a second timing U2 between the UL transmission and ACK/NACK feedback for the UL transmission.
According to an embodiment of the present disclosure, determining at least one of the timings (k) - (m) includes: (n) determining the first timing U1 according to one of the following: for asynchronous UL scheduling grants, determining the first timing U1 by an indicator of the first timing U1 contained in downlink control information, DCI, of the first UL scheduling grant for the corresponding UL transmission using an explicit notification mode, the indicator indicating an uplink index of the corresponding UL transmission, the uplink index indicating a value of an interval to which the first timing U1 corresponds; and, for a synchronized UL scheduling grant, determining the first timing U1 using an implicit notification mode, wherein a value of the interval to which the first timing U1 corresponds is predefined according to a length of a TTI of the UL/DL transmission, (o) determining the third timing U3 according to one of: for asynchronous UL retransmissions, determining the third timing U3 by an indicator of the third timing U3 contained in DCI of the ACK/NACK for the corresponding UL transmission using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmissions, the uplink index indicating a value of an interval to which the third timing U3 corresponds; for asynchronous UL retransmissions, when there is only the pure ACK/NACK feedback for the corresponding UL transmission, determining the third timing U3 by an indicator of the third timing U3 included in the pure ACK/NACK feedback using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmission, the uplink index indicating a value of an interval to which the third timing U3 corresponds; for asynchronous UL retransmissions, determining the third timing U3 by the indicator of the third timing U3 contained in DCI of the first UL scheduling grant using an explicit notification mode when there is only the ACK/NACK feedback for the corresponding UL transmission; and, for synchronized UL retransmissions, determining the third timing U3 using an implicit notification pattern, wherein a value of an interval corresponding to the third timing U3 is predefined according to a length of a TTI of the UL/DL transmission, (p) determining the fourth timing D1 according to one of: for ACK/NACK feedback for asynchronous DL transmissions, determining the fourth timing D1 by an indicator of the fourth timing D1 contained in DCI of a scheduling grant for a DL transmission using an explicit notification mode, the indicator indicating an uplink index of the ACK/NACK for the corresponding DL transmission, the uplink index indicating a value of an interval to which the fourth timing D1 corresponds; and determining the fourth timing D1 using an implicit notification mode for ACK/NACK feedback for the synchronized DL transmission, wherein a value of an interval corresponding to the fourth timing D1 is predefined according to a length of a TTI of the UL/DL transmission.
According to an embodiment of the present disclosure, determining the second timing U2 includes: determining the second timing U2 according to one of the following: for ACK/NACK feedback of asynchronous UL transmissions, determining the second timing U2 through DCI of a second UL scheduling grant, the DCI being used to determine whether retransmission is required, the user equipment obtaining the DCI by blind decoding a TTI of each DL transmission, the DCI including an indicator of an identifier of a UL hybrid automatic repeat request process; for ACK/NACK feedback of asynchronous UL transmissions, determining the second timing U2 by an indicator of the second timing U2 contained in DCI of the first UL scheduling grant using an explicit notification mode, the indicator to indicate a downlink index of the corresponding DL transmission, the downlink index indicating a value of an interval to which the second timing U2 corresponds; and determining the second timing U2 using an implicit notification mode for ACK/NACK feedback for a synchronized UL transmission, wherein a value of an interval corresponding to the second timing U2 is predefined according to a length of a TTI of the UL/DL transmission.
According to an embodiment of the present disclosure, determining the third timing U3 by an indicator of the third timing U3 contained in the pure ACK/NACK feedback using an explicit notification mode for asynchronous UL retransmissions when only the pure ACK/NACK feedback for the corresponding UL transmission is present comprises: the indicator of the third timing U3 included in the pure ACK/NACK feedback uses one of an orthogonal mask sequence, a phase rotation sequence, or a start position of a pseudo random sequence.
According to an embodiment of the present disclosure, determining the third timing U3 using implicit notification mode for synchronized UL retransmissions further comprises: when the ACK/NACK feedback of the asynchronous DL transmission is a pure ACK/NACK feedback, an offset indicator of a value of an interval to which the third timing U3 corresponds, using one of a start position of an orthogonal mask sequence, a phase rotation sequence, or a pseudo random sequence as a value of an interval to which the third timing U3 corresponds, is used to determine an offset of a value of an interval to which the third timing U3 corresponds.
According to an embodiment of the present disclosure, notifying the first timing U1 using an implicit notification mode for the synchronized UL scheduling grant comprises: determining an offset value for the first timing U1 by an offset indicator used in DCI for the synchronized UL scheduling grant, the offset indicator indicating an uplink index offset indicating an offset value for the first timing U1; alternatively, the offset value for the first timing U1 is determined by an indicator of resources of the allocated TTIs of the plurality of UL transmissions in the DCI for the synchronized UL scheduling grant.
According to an embodiment of the present disclosure, determining the fourth timing D1 using an implicit notification pattern for ACK/NACK feedback of the synchronized DL transmission further comprises at least one of: using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of TTIs of different DL transmissions, and including an indicator of the frequency offset in DCI of a scheduling grant for indicating a frequency offset index of a physical uplink control channel, or a numerical value of an interval corresponding to the fourth timing D1 may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the DL transmission; using orthogonal multiplexing for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of DL transmission, indexing an indicator included in DCI of a scheduling grant of DL transmission using an orthogonal mask sequence, or predefining a numerical value of an interval corresponding to the fourth timing D1 according to a length of TTI of the UL/DL transmission and a number of TTI of the DL transmission; and the plurality of ACK/NACK feedbacks for the TTIs of the plurality of different DL transmissions comprise a combined feedback, a downlink allocation index is used in the DCI of the scheduling grant of the DL transmission, the downlink allocation index indicating a location of the respective ACK/NACK feedback in the combined feedback.
According to an embodiment of the present disclosure, determining the second timing U2 using an implicit notification mode for ACK/NACK feedback of the synchronized UL transmission further comprises at least one of: using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of UL transmission, and determining the second timing U2 by including an indicator of the frequency offset in DCI of a UL scheduling grant, the indicator for indicating a frequency offset index of a physical hybrid automatic repeat request indication channel, or a value of an interval corresponding to the second timing U2 may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the UL transmission, or a value of an interval corresponding to the second timing U2 may be detected by blind decoding; determining the second timing U2 using orthogonal multiplexing for a plurality of ACK/NACK feedbacks for a plurality of TTIs for a plurality of different UL transmissions, using an orthogonal mask sequence to index an indicator included in a DCI of a UL scheduling grant, or a numerical value of an interval corresponding to the second timing U2 predefined according to a length of a TTI of the UL/DL transmission and a number of the TTI of the UL transmission; and the plurality of ACK/NACK feedbacks for the TTIs of the plurality of different UL transmissions comprise a combined feedback, and an uplink allocation index is used in the DCI of the UL scheduling grant for indicating a location of the respective ACK/NACK feedback in the combined feedback.
Drawings
Fig. 1 shows the required timing relationship between the normally required UL/DL transmission process and its corresponding HARQ process.
Fig. 2 shows the existing timing relationship used for FDD mode for the correspondence between UL transmission processes and their respective HARQ processes.
Fig. 3 shows the existing corresponding timing relationship between DL transmission processes and their corresponding HARQ processes used for FDD mode.
Fig. 4-8 illustrate ways (a) - (e), respectively, to determine a timing relationship between a DL transmission and a corresponding UL transmission, according to different embodiments of the present disclosure.
Fig. 9-13 illustrate ways (f) - (j), respectively, to determine a timing relationship between a UL transmission and a corresponding DL transmission, according to different embodiments of the present disclosure.
Fig. 14 illustrates two exemplary methods used when determining a timing relationship between a UL transmission and a corresponding DL transmission using one of the manners (f) - (h) illustrated in fig. 9-11, respectively, when the length of the TTI of the DL transmission in frequency division duplex communication is changed.
Fig. 15 shows two exemplary methods used when determining the timing relationship between a UL transmission and a corresponding DL transmission using one of the ways (i) - (j) shown in fig. 12-13, respectively, when the length of the TTI of the DL transmission in frequency division duplex communication is changed.
Fig. 16 shows a plurality of examples of determining the first timing U1 by using the explicit notification mode.
Fig. 17 shows a number of examples of determining the first timing U1 by using implicit notification mode.
Fig. 18 shows a plurality of examples of determining the second timing U2 by using the explicit notification mode.
Fig. 19 shows a plurality of examples of determining the second timing U2 by using the implicit notification mode.
Fig. 20 shows a plurality of examples for determining the third timing U3.
Fig. 21 shows a plurality of examples for determining the fourth timing D1.
Fig. 22 shows an example of the problem that the implicit notification mode results in TTIs where certain UL transmissions cannot be scheduled.
Fig. 23 illustrates one example of using an offset indicator for a TTI of a UL transmission to indicate an offset for the TTI of the UL transmission.
Fig. 24 illustrates an example of the problem that the implicit notification mode results in multiple ACK/NACK feedbacks for the downlink that may overlap on the same TTI of the UL transmission.
Fig. 25 shows an example of the problem that the implicit notification mode causes multiple ACK/NACK feedbacks for uplink may overlap on the TTI of the same DL transmission.
Fig. 26 illustrates an example flow diagram of a method for frequency division duplex communication in accordance with an embodiment of this disclosure.
Fig. 27 illustrates an example block diagram of an apparatus for frequency division duplex communication in accordance with an embodiment of this disclosure.
Detailed Description
A detailed description of the proposed design for TTI lengths for asymmetric UL and DL transmissions, and related methods and apparatus for frequency division duplex communication, will be provided below with reference to the accompanying drawings.
For the case where the TTI lengths of UL and DL transmissions are asymmetric, the conventional timing relationship cannot be reused, and the timing relationship needs to be redesigned. Since UL and DL have different TTI lengths, a new TTI reference point is needed at the time of UL to DL transition and at the time of DL to UL transition.
To this end, embodiments of the present disclosure propose methods for frequency division duplex communication, the methods comprising determining at least one of a timing relationship between a downlink DL transmission and a corresponding uplink UL transmission and a timing relationship between an UL transmission and a corresponding DL transmission; performing at least one of an UL transmission corresponding to the DL transmission and a DL transmission corresponding to the UL transmission according to the determined timing relationship.
According to an embodiment of the disclosure, the method supports dynamic TTI lengths.
In this case, the method further includes: changing a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication.
According to embodiments of the present disclosure, a timing relationship between the DL transmissions and the corresponding UL transmissions needs to be determined. When DL is switched to UL, the TTI of the UL transmission closest to the end of the TTI of the DL transmission is selected as the reference point.
In this case, as illustrated in fig. 4 to 8, the method further specifically includes: determining a timing relationship between the DL transmissions and corresponding UL transmissions using at least one selected from the following:
mode (a) (relative timing): for the TTI of the nth DL transmission, the TTI (denoted m) of the first UL transmission, which starts after (or at) the end of the TTI of the nth DL transmission, is selected as the reference point. The TTI of the corresponding UL transmission (the TTI corresponding to the nth DL transmission) is the TTI of the m + k UL transmissions.
Mode (b) (relative timing): for the TTI of the nth DL transmission, the TTI (denoted m) of the last UL transmission, which starts (completely) before the end of the TTI of the nth DL transmission, is selected as the reference point. The TTI of the corresponding UL transmission (the TTI corresponding to the nth DL transmission) is the TTI of the m + k UL transmissions.
Mode (c) (absolute timing): the end of the TTI of the DL transmission (at the xth Orthogonal Frequency Division Multiplexing (OFDM) symbol (OS)) is taken as the reference point. The TTI of the corresponding UL transmission (the TTI corresponding to the DL transmission) starts at the x + k th OS.
Mode (d): the TTI of the nth DL transmission is selected as the reference point. The TTI of the first UL transmission that starts after the end of the TTI of the n + k th DL transmission is taken as the TTI of the corresponding UL transmission (corresponding to the TTI of the nth DL transmission).
Mode (e): the TTI of the nth DL transmission is selected as the reference point. The TTI of the first UL transmission that starts after (or at the beginning of) the TTI of the n + k th DL transmission is taken as the TTI of the corresponding UL transmission (corresponding to the TTI of the nth DL transmission).
According to embodiments of the present disclosure, a timing relationship between the UL transmissions and the corresponding DL transmissions needs to be determined. When switching from UL to DL, the TTI of the DL transmission closest to the end of the TTI of the UL transmission is selected as the reference point.
In this case, as illustrated in fig. 9 to 13, the method further specifically includes: determining a timing relationship between the UL transmission and a corresponding DL transmission using at least one selected from the following:
mode (f): (relative timing): for the TTI of the mth UL transmission, the TTI (denoted by n) of the first DL transmission that starts after (or at the end of) the end of the TTI of the mth UL transmission is selected as the reference point. The TTI of the corresponding DL transmission (the TTI corresponding to the mth UL transmission) is the TTI of the n + k DL transmission.
Mode (g): (relative timing): for the TTI of the mth UL transmission, the TTI (denoted by n) of the last DL transmission, which starts (completely) before the end of the TTI of the mth UL transmission, is selected as the reference point. The TTI of the corresponding DL transmission (the TTI corresponding to the mth UL transmission) is the TTI of the n + k DL transmission.
Mode (h) (absolute timing): the end of the TTI of the UL transmission (at the xth OS) is taken as the reference point. The TTI of the corresponding DL transmission (corresponding to the TTI of the UL transmission) starts at the x + k th OS.
Mode (i): the TTI of the mth UL transmission is selected as the reference point. The TTI of the first DL transmission that starts after the end of the TTI of the m + k th UL transmission is taken as the TTI of the corresponding DL transmission (corresponding to the TTI of the m-th UL transmission).
Mode (j): the TTI of the mth UL transmission is selected as the reference point. The TTI of the first DL transmission that starts after (or at the beginning of) the TTI of the m + k th UL transmission is taken as the TTI of the corresponding DL transmission (corresponding to the TTI of the m-th UL transmission).
According to an embodiment of the present disclosure, for the above-described manners (a) - (c) when DL is switched to UL and the above-described manners (f) - (h) when UL is switched to DL: if the length of the UL (DL) TTI is allowed to change after the DL (UL) transmission when switching from DL to UL (UL to DL, as shown in FIG. 14), the UE should know the length of the corresponding UL (DL) TTI through some signaling. The reference point is calculated using a related method according to the length of the TTI of the ul (dl) after the change. Alternatively, for the above-described modes (d) - (e) when DL is switched to UL and the above-described modes (i) - (j) when UL is switched to DL: if the length of the UL (DL) TTI is allowed to change after the DL (UL) transmission at the DL to UL transition (UL to DL, as shown in FIG. 15), the first UL (DL) TTI (regardless of the TTI length) that satisfies the timing relationship serves as the corresponding UL (DL) TTI.
The method further comprises the following steps: in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication: calculating a reference point according to the length of the changed TTI and using one of the above-described manners (a) - (c) or one of the above-described manners (f) - (h), respectively, when performing UL transmission corresponding to DL transmission or DL transmission corresponding to UL transmission, to determine a timing relationship between the DL transmission and the corresponding UL transmission; alternatively, the timing relationship between the DL transmission and the corresponding UL transmission is determined using one of the above manners (d) - (e) or one of the above manners (i) - (j), respectively.
Considering that the above-described conventional fifth timing D2 is controlled by the eNB, it is not necessary to newly design it. Therefore, in the present disclosure, the design of the timings U1, U2, U3, and D1 is mainly focused.
To this end, according to an embodiment of the present disclosure, in the method, determining a timing relationship between the DL transmissions and the respective UL transmissions comprises: determining at least one of the following timings: (k) a first timing U1 between a first UL scheduling grant in the DL transmissions and the corresponding UL transmission; (l) A third timing U3 between positive acknowledgement/negative acknowledgement (ACK/NACK) in the DL transmission for the respective UL transmission and UL retransmissions; and, (m) a fourth timing D1 between data transmission in the DL transmission and ACK/NACK feedback for the corresponding DL transmission.
Also, in accordance with an embodiment of the present disclosure, in the method, determining a timing relationship between the UL transmissions and the corresponding DL transmissions comprises: determining a second timing U2 between the UL transmission and ACK/NACK feedback for the UL transmission.
The timings U1, U2, U3, and D1 (i.e., the interval between the reference point and its response) can be explicitly or implicitly notified. For the explicit notification mode, the value of the interval is transmitted via some signaling such as DCI or PHICH. For the implicit notification mode, the number of intervals is predefined according to the length of the TTI of the UL/DL transmission.
According to an embodiment of the present disclosure, the following may be employed for the first timing U1:
select 1 (explicit notification mode for asynchronous UL scheduling as shown in fig. 16): the DCI of the UL scheduling grant includes an indicator of the first timing U1, for example, a 3-bit indicator: the uplink index k is 0, 1, …, 7.
Option 2 (implicit notification mode for synchronized UL scheduling as shown in fig. 17): the value of the interval is predefined according to the length of the TTI of the UL/DL transmission. For example, the predefined values follow two principles:
1) the numerical value is as small as possible;
2) satisfy Tinterval≥2Tpropagation+Tsignal processing(LUL TTI,LDL TTI) Wherein T isintervalIndicates the interval, T, between the end of the TTI of the nth DL transmission and the beginning of the TTI of the m + k UL transmissionspropagationRepresents the propagation delay Tsignal processingIndicates the time delay of signal processing (related to the length of the TTI of UL/DL), and LUL TTI,LDL TTIIndicating the length of the TTI of the UL/DL transmission.
Figure GDA0000985152610000191
Specific examples of the time are shown in table 1 and fig. 17:
table 1 example of values of intervals of the first timing U1
Figure GDA0000985152610000201
According to an embodiment of the present disclosure, as shown in fig. 20, the following may be employed for the third timing U3:
select 1 (explicit notification/implicit notification mode for asynchronous UL retransmission): if the DCI of the new UL scheduling grant is used at the time of ACK/NACK feedback, the third timing U3 is notified using a method consistent with the notification of the first timing U1.
Select 2 (explicit notification mode for asynchronous UL retransmissions): if only pure ACK/NACK feedback (similar to PHICH) is used, then the pure ACK/NACK feedback includes an indicator of the third timing U3, e.g., using a 3-bit indicator: the uplink retransmission index k is 0, 1, …, 7. The indicator is notified, for example, by ACK/NACK feedback using an Orthogonal Cover Code (OCC) sequence as shown in table 2.
Table 2 example of orthogonal masking sequences
Index value Orthogonal mask sequence
0 [+1 +1 +1 +1]
1 [+1 -1 +1 -1]
2 [+1 +1 -1 -1]
3 [+1 -1 -1 +1]
4 [+j +j +j +j]
5 [+j -j +j -j]
6 [+j +j -j -j]
7 [+j -j -j +j]
TABLE 3 example of phase rotation sequences
Index value Phase rotation sequence
0 [+1 +1 +1]
1 [+1 +1 -1]
2 [+1 -1 -1]
3 [+1 -1 +1]
4 [-1 -1 +1]
5 [-1 -1 -1]
6 [-1 +1 -1]
7 [-1 +1 +1]
Alternatively, the indicator is notified by using ACK/NACK feedback of phase rotation as shown in table 3, for example.
Alternatively, the start position of the pseudo random sequence fed back through ACK/NACK
Figure GDA0000985152610000211
To inform the indicator.
Select 3 (explicit notification mode for asynchronous UL retransmissions): if only ACK/NACK feedback (similar to PHICH) is used, an indicator of the third timing U3 is included in the DCI of the original UL scheduling grant, e.g., a 3-bit indicator: the uplink retransmission index k is 0, 1, …, 7.
Select 4 (implicit notification mode for synchronized UL retransmissions): similar to option 2 of the first timing U1, the value of the interval is predefined according to the length of the TTI of the UL/DL transmission.
According to an embodiment of the present disclosure, as shown in fig. 21, the following may be employed for the fourth timing D1:
select 1 (explicit notification mode for ACK/NACK feedback for asynchronous DL transmission): the DCI of the scheduling grant for DL transmission includes an indicator of the fourth timing D1, for example, a 3-bit indicator: the uplink index k is 0, 1, …, 7.
Select 2 (implicit notification mode for ACK/NACK feedback for synchronized DL transmission): similar to option 2 of the first timing U1, the value of the interval is predefined according to the length of the TTI of the UL/DL transmission.
In this case, according to an embodiment of the present disclosure, in the method, determining at least one of the timings (k) - (m) includes: (n) determining the first timing U1 according to one of the following: for asynchronous UL scheduling grants, determining the first timing U1 by an indicator of the first timing U1 contained in downlink control information, DCI, of the first UL scheduling grant for the corresponding UL transmission using an explicit notification mode, the indicator indicating an uplink index of the corresponding UL transmission, the uplink index indicating a value of an interval to which the first timing U1 corresponds; and, for a synchronized UL scheduling grant, determining the first timing U1 using an implicit notification mode, wherein a value of the interval to which the first timing U1 corresponds is predefined according to a length of a TTI of the UL/DL transmission, (o) determining the third timing U3 according to one of: for asynchronous UL retransmissions, determining the third timing U3 by an indicator of the third timing U3 contained in DCI of the ACK/NACK for the corresponding UL transmission using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmissions, the uplink index indicating a value of an interval to which the third timing U3 corresponds; for asynchronous UL retransmissions, when there is only the pure ACK/NACK feedback for the corresponding UL transmission, determining the third timing U3 by an indicator of the third timing U3 included in the pure ACK/NACK feedback using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmission, the uplink index indicating a value of an interval to which the third timing U3 corresponds; for asynchronous UL retransmissions, determining the third timing U3 by the indicator of the third timing U3 contained in DCI of the first UL scheduling grant using an explicit notification mode when there is only the ACK/NACK feedback for the corresponding UL transmission; and, for synchronized UL retransmissions, determining the third timing U3 using an implicit notification pattern, wherein a value of an interval corresponding to the third timing U3 is predefined according to a length of a TTI of the UL/DL transmission, (p) determining the fourth timing D1 according to one of: for ACK/NACK feedback of asynchronous DL transmissions, determining the fourth timing D1 by an indicator of the fourth timing D1 included in DCI of a scheduling grant of a DL transmission using an explicit notification mode, the indicator indicating an uplink index of the ACK/NACK of the corresponding DL transmission, the uplink index indicating a value of an interval corresponding to the fourth timing D1; and determining the fourth timing D1 using an implicit notification mode for ACK/NACK feedback for the synchronized DL transmission, wherein a value of an interval corresponding to the fourth timing D1 is predefined according to a length of a TTI of the UL/DL transmission.
In this case, in the method, determining the third timing U3 further includes: the indicator of the third timing U3 included in the pure ACK/NACK feedback uses one of an orthogonal mask sequence, a phase rotation sequence, or a start position of a pseudo random sequence.
According to an embodiment of the present disclosure, the following may be employed for the second timing U2:
select 1 (blind decoding for ACK/NACK feedback for asynchronous UL transmission): the eNB transmits DCI of a new UL scheduling grant to inform the UE whether retransmission is required. The UE acquires new DCI by blind decoding in the TTI of each DL transmission. Since the timing relationship (asynchronization) is not satisfied between the Identifier (ID) of the UL HARQ process and the number (number) of the TTI of the DCI of the UL scheduling grant, an indicator of the ID of the UL HARQ process is included in the DCI.
Option 2 (explicit notification mode of ACK/NACK feedback for asynchronous UL transmission as shown in fig. 18): the DCI of the first UL scheduling grant includes an indicator of the second timing U2, for example, a 3-bit indicator: the lower index k is 0, 1, …, 7.
Option 3 (implicit notification detection of ACK/NACK feedback for synchronized UL transmission as shown in fig. 19): the number of intervals is predefined according to the length of the TTI of UL/DL transmission. The timing relationship (synchronization) is satisfied between the ID of the UL HARQ process and the number of TTIs of ACK/NACK. The predefined values follow two principles:
1) the numerical value is as small as possible;
2) satisfy Tinterval≥2Tpropagation+Tsignal processing(LUL TTI,LDL TTI) Wherein T isintervalIndicates the interval, T, between the end of the TTI of the m-th UL transmission and the beginning of the TTI of the n + k-th DL transmissionpropagationRepresents the propagation delay Tsignal processingIndicates the time delay of the signal processing (related to the length of the TTI of the UL/DL transmission), and LUL TTI,LDL TTIIndicating the length of the TTI of the UL/DL transmission.
Figure GDA0000985152610000231
Specific examples of the time are shown in table 4 and fig. 19:
table 4 example of numerical values of intervals of the second timing U2
Figure GDA0000985152610000232
In this case, in the method, determining the second timing U2 further includes: determining the second timing U2 according to one of the following: for ACK/NACK feedback of asynchronous UL transmissions, determining the second timing U2 through DCI of a second UL scheduling grant, the DCI being used to determine whether retransmission is required, the user equipment obtaining the DCI by blind decoding a TTI of each DL transmission, the DCI including an indicator of an identifier of a UL hybrid automatic repeat request process; for ACK/NACK feedback of asynchronous UL transmissions, determining the second timing U2 by an indicator of the second timing U2 contained in DCI of the first UL scheduling grant using an explicit notification mode, the indicator to indicate a downlink index of the corresponding DL transmission, the downlink index indicating a value of an interval to which the second timing U2 corresponds; and determining the second timing U2 using an implicit notification mode for ACK/NACK feedback for a synchronized UL transmission, wherein a value of an interval corresponding to the second timing U2 is predefined according to a length of a TTI of the UL/DL transmission.
Other problems with implicit notification patterns
Implicit notification mode is less overhead than explicit notification mode, but may cause certain problems, such as TTI's where certain UL transmissions cannot be scheduled and multiple ACK/NACK feedbacks of dl (UL) overlapping on the same UL (dl) TTI. To solve these problems, additional indicators need to be introduced and transmitted by means of some kind of signaling. Three specific examples of which are described below:
1. the implicit notification mode results in the problem of not being able to schedule TTIs for certain UL transmissions, as shown in fig. 22.
Selecting 1: as shown in fig. 23, an offset indicator for the TTI of the UL transmission is used. For example, in DCI for a UL scheduling grant, a 2-bit offset indicator is used to indicate that an uplink index offset w is 0, 1, 2, and 3. For example, for pure ACK/NACK feedback, the offset indicator is set by the start position of an OCC sequence, a phase rotation sequence, or a pseudo-random sequence.
In this case, in the method, determining the third timing U3 further includes: when the ACK/NACK feedback of the asynchronous DL transmission is a pure ACK/NACK feedback, an offset indicator of a value of an interval to which the third timing U3 corresponds, using one of a start position of an orthogonal mask sequence, a phase rotation sequence, or a pseudo random sequence as a value of an interval to which the third timing U3 corresponds, is used to determine an offset of a value of an interval to which the third timing U3 corresponds.
Selecting 2: the DCI of the UL scheduling grant allocates resources for a plurality of TTIs of UL transmission. For example, the DCI of the UL scheduling grant manages a plurality of consecutive TTIs of UL transmissions over which the UE may transmit using the same Resource Block (RB) allocation and the same Modulation and Coding Scheme (MCS) configuration. For example, a bitmap 01/10/11 of TTIs for multiple UL transmissions managed by DCI for a UL scheduling grant. The UE transmits using the same RB allocation and the same MCS configuration over the TTIs of the multiple UL transmissions.
In this case, in the method, notifying the first timing U1 using an implicit notification mode for the synchronized UL scheduling grant, further comprising: (corresponding to option 1 above) determining an offset value for the first timing U1 by an offset indicator used in DCI for the synchronized UL scheduling grant, the offset indicator indicating an uplink index offset, the uplink index offset indicating an offset value for the first timing U1; alternatively, the offset value for the first timing U1 is determined (corresponding to option 2 above) by an indicator of resources of TTIs of the allocated plurality of UL transmissions in the DCI for the synchronized UL scheduling grant.
2. As shown in fig. 24, the implicit notification mode causes a problem that multiple ACK/NACK feedbacks for downlink may overlap on the same TTI of UL transmission.
Selecting 1: multiple frequency offsets are used for multiple ACK/NACK feedbacks for multiple different TTIs for DL transmissions. An indicator of a frequency offset (PUCCH frequency offset index) may be included in DCI of a scheduling grant of DL transmission, or may be predefined according to the length of TTI of UL/DL transmission and the number of TTI of DL transmission.
Selecting 2: orthogonal multiplexing is used for multiple ACK/NACK feedbacks for TTIs for multiple different DL transmissions. The OCC may be used to index an indicator (PUCCH OCC) included in DCI of a scheduling grant of DL transmission, or may be predefined according to the length of TTI of UL/DL transmission and the number of TTI of DL transmission.
Selecting 3: the multiple ACK/NACK feedbacks for the TTIs of multiple different DL transmissions comprise a combined feedback (similar to format 3 of PUCCH). A downlink allocation index is required in DCI of a scheduling grant for DL transmission for indicating a position of a corresponding ACK/NACK feedback in the combined feedback.
In this case, in the method, the ACK/NACK feedback of the synchronized DL transmission, determining the fourth timing D1 using an implicit notification pattern, further comprises at least one of: (corresponding to option 1 above) using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of DL transmission, and including in the DCI of the scheduling grant an indicator of the frequency offset for indicating a frequency offset index of a physical uplink control channel, or a numerical value of an interval corresponding to the fourth timing D1 may be predefined according to the length of the TTI of UL/DL transmission and the number of TTIs of DL transmission; (corresponding to option 2 above) using orthogonal multiplexing for multiple ACK/NACK feedbacks for multiple different TTIs of DL transmission, using an orthogonal mask sequence to index an indicator contained in DCI of a scheduling grant of DL transmission, or a numerical value of an interval corresponding to the fourth timing D1 may be predefined according to the length of TTI of UL/DL transmission and the number of TTI of DL transmission; and (corresponding to option 3 above) the plurality of ACK/NACK feedbacks for the TTIs of the plurality of different DL transmissions comprise combined feedback, a downlink allocation index being used in the DCI of the scheduling grant of the DL transmission, the downlink allocation index being used to indicate the location of the respective ACK/NACK feedback in the combined feedback.
3. As shown in fig. 25, the implicit notification mode causes a problem that a plurality of ACK/NACK feedbacks for uplink may overlap on the TTI of the same DL transmission.
Selecting 1: multiple frequency offsets are used for multiple ACK/NACK feedbacks for multiple different TTIs for UL transmissions. An indicator of a frequency offset (PHICH frequency offset index) may be included in DCI of the UL scheduling grant, or may be predefined according to the length of TTI of UL/DL transmission and the number of TTI of UL transmission, or may be detected through blind decoding (similar to a Physical Downlink Control Channel (PDCCH)).
Selecting 2: orthogonal multiplexing is used for multiple ACK/NACK feedbacks for multiple different TTIs for UL transmissions. The OCC may be used to index an indicator (PHICH OCC) included in DCI of the UL scheduling grant, or may be predefined according to the length of TTI of UL/DL transmission and the number of TTI of UL transmission.
Selecting 3: the multiple ACK/NACK feedbacks for the TTIs of multiple different UL transmissions comprise a combined feedback (similar to format 3 of PUCCH). An uplink allocation index is required in the DCI of the UL scheduling grant for indicating the position of the corresponding ACK/NACK feedback in the combined feedback.
In this case, in the method, determining the second timing U2 using an implicit notification mode for ACK/NACK feedback of the synchronized UL transmission further comprises at least one of: (corresponding to option 1 above) using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of UL transmission, and including an indicator of the frequency offset in DCI of the UL scheduling grant to determine the second timing U2, the indicator indicating a frequency offset index of a physical hybrid automatic repeat request indication channel, or a value of an interval corresponding to the second timing U2 may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the UL transmission, or a value of an interval corresponding to the second timing U2 may be detected by blind decoding; (corresponding to option 2 above) using orthogonal multiplexing for multiple ACK/NACK feedbacks for multiple different TTIs of UL transmissions, using an orthogonal mask sequence to index an indicator contained in DCI of a UL scheduling grant, or the second timing U2 may be determined according to a value of an interval corresponding to the second timing U2 predefined by the length of TTI of the UL/DL transmission and the number of TTI of the UL transmission; and (corresponding to option 3 above) the plurality of ACK/NACK feedbacks for the plurality of different TTIs of UL transmissions comprise a combined feedback, an uplink allocation index being used in the DCI of the UL scheduling grant for indicating the location of the respective ACK/NACK feedback in the combined feedback.
Fig. 26 illustrates an example flow diagram of a method for frequency division duplex communication in accordance with an embodiment of this disclosure.
As shown in fig. 26, in step S2601, at least one of a timing relationship between a DL transmission and a corresponding UL transmission and a timing relationship between a UL transmission and a corresponding DL transmission is determined, wherein a length of a TTI of the UL transmission and a length of a TTI of the DL transmission in frequency division duplex communication are set to be asymmetric.
In step S2602, at least one of an UL transmission corresponding to the DL transmission and a DL transmission corresponding to the UL transmission is performed according to the determined timing relationship.
Optionally, in step S2603, the length of the TTI of the UL transmission or the length of the TTI of the DL transmission in the frequency division duplex communication is changed.
Optionally, in step S2604, a timing relationship between the DL transmission and the corresponding UL transmission is determined using at least one selected from the means (a) - (e).
Optionally, in step S2605, a timing relationship between the UL transmission and the corresponding DL transmission is determined using at least one selected from the means (f) - (j).
Optionally, in step S2606, in response to a change in the length of the TTI of the UL transmission or the length of the TTI of the DL transmission in the frequency division duplex communication: calculating a reference point according to the length of the changed TTI and using one of the manners (a) - (c) or (f) - (h) to determine a timing relationship between the DL transmission and a corresponding UL transmission or between the UL transmission and a corresponding DL transmission; alternatively, one of the manners (d) - (e) or (i) - (j) is used to determine the timing relationship between the DL transmission and the corresponding UL transmission or between the UL transmission and the corresponding DL transmission.
Fig. 27 illustrates an example block diagram of an apparatus for frequency division duplex communication in accordance with an embodiment of this disclosure. The device includes a determination means 2701, an execution means 2702, and optionally a setting means 2703, a first selection means 2704, a second selection means 2705, a third selection means 2706, and a fourth selection means 2707.
The determining means 2701 is configured to determine at least one of a timing relationship between DL transmissions and corresponding UL transmissions and a timing relationship between UL transmissions and corresponding DL transmissions.
The performing means 2702 is configured to perform at least one of an UL transmission corresponding to the DL transmission and a DL transmission corresponding to the UL transmission according to the determined timing relationship.
The setting means 2703 is configured to change the length of the TTI of the UL transmission or the length of the TTI of the DL transmission in said frequency division duplex communication.
The first selection means 2704 is configured to determine a timing relationship between said DL transmission and a corresponding UL transmission using at least one selected from the means (a) - (e).
The second selecting means 2705 is configured to, in response to a change in the length of the TTI of the UL transmission or the length of the TTI of the DL transmission in the frequency division duplex communication: calculating a reference point according to the length of the changed TTI and using one of the manners (a) - (c) to determine a timing relationship between the DL transmission and a corresponding UL transmission; alternatively, one of the manners (d) - (e) is used to determine the timing relationship between the DL transmission and the corresponding UL transmission.
The third selecting means 2706 is configured to determine a timing relationship between the UL transmission and the corresponding DL transmission using at least one selected from the means (f) - (j).
The fourth selecting means 2707 is configured to, in response to a change in the length of the TTI of the UL transmission or the length of the TTI of the DL transmission in the frequency division duplex communication: calculating a reference point according to the length of the changed TTI and using one of the manners (f) - (h) to determine a timing relationship between the UL transmission and the corresponding DL transmission; alternatively, one of the manners (i) - (j) is used to determine the timing relationship between the UL transmission and the corresponding DL transmission.
Only some of the illustrative example steps and device components are included in the example communication methods and apparatus of fig. 26 and 27, but those skilled in the art will appreciate that other steps and device components may be included therein.
As described above, at least one embodiment according to the present disclosure has been described, but it is to be understood that, although some of the above embodiments have been described with respect to one of the timing relationship between downlink DL transmissions and corresponding uplink UL transmissions or the timing relationship between UL transmissions and corresponding DL transmissions, one skilled in the art can imagine the same method being employed in another timing relationship. It is also to be understood that the above-described embodiments are not limiting of the embodiments of the disclosure, which are limited only by the scope of the appended claims.

Claims (30)

1. A method for frequency division duplex communication, comprising:
determining at least one of a timing relationship between downlink DL transmissions and corresponding uplink UL transmissions and a timing relationship between UL transmissions and corresponding DL transmissions; and
performing at least one of an UL transmission corresponding to the DL transmission and a DL transmission corresponding to the UL transmission according to the determined timing relationship;
wherein a length of a transmission time interval, TTI, of a UL transmission and a length of a TTI of a DL transmission in the frequency division duplex communication are set to be asymmetric.
2. The method of claim 1, further comprising:
changing a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication.
3. The method of claim 1 or 2, further comprising:
determining a timing relationship between the DL transmissions and corresponding UL transmissions using at least one selected from the following:
(a) for the TTI of the nth DL transmission, selecting as the reference point the TTI of the first one of the UL transmissions numbered m that starts after or at the end of the TTI of the nth DL transmission, and determining the TTI of the m + k UL transmissions as the TTI corresponding to the TTI of the nth DL transmission for which the UL transmission of the respective UL transmission is to take place;
(b) for the TTI of the nth DL transmission, selecting a last TTI of the UL transmission numbered m that starts completely before the end of the TTI of the nth DL transmission as a reference point, and determining the TTI of the m + k UL transmissions as the TTI of the UL transmission corresponding to the TTI of the nth DL transmission for the corresponding UL transmission;
(c) taking an end of a TTI of a DL transmission at an x-th orthogonal frequency division multiplexing symbol, OS, as a reference point, and determining an x + k-th OS as a starting position of a TTI of a UL transmission corresponding to the TTI of the DL transmission for which the corresponding UL transmission is made;
(d) selecting a TTI of an nth DL transmission as a reference point, and taking a TTI of a first UL transmission that begins after an end of a TTI of an n + k DL transmission as a TTI, corresponding to the TTI of the nth DL transmission, for UL transmission of the respective UL transmission; and
(e) selecting a TTI of an nth DL transmission as a reference point, and taking a TTI of a first UL transmission that begins after or at the beginning of the TTI of an n + k th DL transmission as a TTI corresponding to the TTI of the nth DL transmission for the UL transmission of the respective UL transmission.
4. The method of claim 3, further comprising:
in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication:
calculating a reference point according to the length of the changed TTI and using one of the manners (a) - (c) to determine a timing relationship between the DL transmission and a corresponding UL transmission; or
Determining a timing relationship between the DL transmission and a corresponding UL transmission using one of manners (d) - (e).
5. The method of claim 1 or 2, further comprising:
determining a timing relationship between the UL transmission and a corresponding DL transmission using at least one selected from the following:
(f) for the mth TTI of the UL transmission, selecting as the reference point the TTI of the first N-numbered DL transmission that begins after or at the end of the mth TTI, and determining the TTI of the (n + k) -th DL transmission as the TTI corresponding to the mth TTI of the UL transmission for the DL transmission for which the respective DL transmission is made;
(g) for the mth TTI of UL transmission, selecting a last TTI of the DL transmission numbered n starting completely before the end of the mth TTI of UL transmission as a reference point, and determining the TTI of the n + k DL transmissions as the TTI corresponding to the mth TTI of UL transmission for the DL transmission of the corresponding DL transmission;
(h) taking an end of a TTI of a UL transmission at an x-th OS as a reference point, and determining an x + k-th OS as a start position of a TTI of a DL transmission for the DL transmission corresponding to the TTI of the UL transmission;
(i) selecting a TTI of an mth UL transmission as a reference point, and taking a TTI of a first DL transmission that starts after an end of a TTI of an m + k UL transmission as a TTI, corresponding to the TTI of the mth UL transmission, for a DL transmission of the respective DL transmission; and
(j) selecting the TTI of the mth UL transmission as the reference point, and taking the TTI of the first DL transmission that starts after or at the beginning of the TTI of the m + k UL transmissions as the TTI of the DL transmission corresponding to the mth UL transmission for the respective DL transmission.
6. The method of claim 5, further comprising:
in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication:
calculating a reference point according to the length of the changed TTI and using one of the manners (f) - (h) to determine a timing relationship between the UL transmission and the corresponding DL transmission; or
Determining a timing relationship between the UL transmission and a corresponding DL transmission using one of manners (i) - (j).
7. The method of claim 3, wherein determining a timing relationship between the DL transmissions and corresponding UL transmissions comprises:
determining at least one of the following timings:
(k) a first timing (U1) between a first UL scheduling grant in the DL transmissions and a corresponding UL transmission;
(l) A third timing (U3) between positive acknowledgement/negative acknowledgement (ACK/NACK) in the DL transmission for the respective UL transmission and UL retransmissions; and
(m) a fourth timing (D1) between data transmission in the DL transmissions and ACK/NACK feedback for the respective DL transmissions.
8. The method of claim 5, wherein determining a timing relationship between the UL transmissions and corresponding DL transmissions comprises:
determining a second timing between the UL transmission and ACK/NACK feedback for the UL transmission (U2).
9. The method of claim 7, wherein determining at least one of the timings (k) - (m) comprises:
(n) determining the first timing (U1) according to one of the following:
for asynchronous UL scheduling grants, determining the first timing (U1) by an indicator of the first timing (U1) contained in downlink control information, DCI, of the first UL scheduling grant for the respective UL transmission using an explicit notification mode, the indicator being to indicate an uplink index of the respective UL transmission, the uplink index indicating a value of an interval to which the first timing (U1) corresponds; and
determining the first timing (U1) using an implicit notification pattern for a synchronized UL scheduling grant, wherein a numerical value of the interval for the first timing (U1) is predefined according to a length of a TTI of the UL/DL transmission,
(o) determining the third timing (U3) according to one of the following:
for asynchronous UL retransmissions, determining the third timing (U3) by an indicator of the third timing (U3) contained in DCI of the ACK/NACK for the respective UL transmission using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmissions, the uplink index indicating a value of an interval to which the third timing (U3) corresponds;
for asynchronous UL retransmissions, when there is only pure ACK/NACK feedback for the respective UL transmission, determining the third timing (U3) by an indicator of the third timing (U3) contained in the pure ACK/NACK feedback using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmission, the uplink index indicating a value of an interval to which the third timing (U3) corresponds;
for asynchronous UL retransmissions, determining the third timing (U3) by the indicator of the third timing (U3) contained in DCI of the first UL scheduling grant using an explicit notification mode when there is only the ACK/NACK feedback for the corresponding UL transmission; and
determining the third timing (U3) using an implicit notification pattern for a synchronized UL retransmission, wherein a value of an interval to which the third timing (U3) corresponds is predefined according to a length of a TTI of the UL/DL transmission,
(p) determining the fourth timing (D1) according to one of the following:
for ACK/NACK feedback for asynchronous DL transmissions, determining the fourth timing (D1) by an indicator of the fourth timing (D1) contained in DCI of a scheduling grant for a DL transmission using an explicit notification mode, the indicator indicating an uplink index of the ACK/NACK for the corresponding DL transmission, the uplink index indicating a value of an interval to which the fourth timing (D1) corresponds; and
determining the fourth timing (D1) using an implicit notification pattern for ACK/NACK feedback for synchronized DL transmissions, wherein a numerical value of an interval to which the fourth timing (D1) corresponds is predefined according to a length of a TTI of the UL/DL transmission.
10. The method of claim 8, wherein determining the second timing (U2) comprises:
determining the second timing (U2) according to one of the following:
for ACK/NACK feedback for asynchronous UL transmissions, determining the second timing (U2) by DCI of a second UL scheduling grant, the DCI being used to determine whether retransmissions are required, the user equipment obtaining the DCI by blind decoding a TTI of each DL transmission, an indicator of an identifier of a UL hybrid automatic repeat request process being included in the DCI;
for ACK/NACK feedback for asynchronous UL transmissions, determining the second timing (U2) by an indicator of the second timing (U2) contained in DCI of a first UL scheduling grant, using an explicit notification mode, the indicator to indicate a downlink index of the corresponding DL transmission, the downlink index indicating a value of an interval to which the second timing (U2) corresponds; and
determining the second timing (U2) using an implicit notification pattern for ACK/NACK feedback for a synchronized UL transmission, wherein a numerical value of an interval to which the second timing (U2) corresponds is predefined according to a length of a TTI of the UL/DL transmission.
11. The method of claim 9, wherein determining the third timing (U3) for asynchronous UL retransmissions using an explicit notification mode when only the pure ACK/NACK feedback for the respective UL transmission is present, by an indicator of the third timing (U3) included in the pure ACK/NACK feedback, comprises:
the indicator of the third timing (U3) included in the pure ACK/NACK feedback uses one of an orthogonal mask sequence, a phase rotation sequence, or a start position of a pseudo-random sequence.
12. The method of claim 9, wherein determining the third timing (U3) using an implicit notification mode for synchronized UL retransmissions further comprises:
when the ACK/NACK feedback of the asynchronous DL transmission is a pure ACK/NACK feedback, an offset indicator using one of a start position of an orthogonal mask sequence, a phase rotation sequence, or a pseudo random sequence as a value of an interval corresponding to the third timing (U3) is used to determine an offset of a value of an interval corresponding to the third timing (U3).
13. The method of claim 9, wherein notifying the first timing (U1) using an implicit notification mode for the synchronized UL scheduling grant comprises:
determining an offset value for the first timing (U1) by an offset indicator used in DCI for the synchronized UL scheduling grant, the offset indicator indicating an uplink index offset indicating an offset value for the first timing (U1); or
Determining an offset value for the first timing (U1) by an indicator of resources of the allocated TTI of the plurality of UL transmissions in the DCI for the synchronized UL scheduling grant.
14. The method of claim 9, wherein determining the fourth timing (D1) using an implicit notification pattern for ACK/NACK feedback of the synchronized DL transmission further comprises at least one of:
using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of TTIs for a plurality of different DL transmissions, and including in a DCI of a scheduling grant an indicator of a frequency offset for indicating a frequency offset index of a physical uplink control channel, or a numerical value of an interval corresponding to the fourth timing (D1) may be predefined according to a length of a TTI of the UL/DL transmission and a number of the TTI of the DL transmission;
using orthogonal multiplexing for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of DL transmissions, using an orthogonal mask sequence to index an indicator contained in DCI of a scheduling grant of a DL transmission, or a numerical value of an interval corresponding to the fourth timing (D1) may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the DL transmission; and
the plurality of ACK/NACK feedbacks for the TTIs of the plurality of different DL transmissions comprise a combined feedback, a downlink allocation index is used in the DCI of the scheduling grant of the DL transmission, the downlink allocation index indicating a location of the respective ACK/NACK feedback in the combined feedback.
15. The method of claim 10, wherein determining the second timing (U2) using an implicit notification mode for ACK/NACK feedback for the synchronized UL transmission further comprises at least one of:
using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of the UL transmission, and determining the second timing (U2) by including an indicator of the frequency offset in a DCI of a UL scheduling grant, the indicator for indicating a frequency offset index of a physical hybrid automatic repeat request indication channel, or a value of an interval corresponding to the second timing (U2) may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the UL transmission, or a value of an interval corresponding to the second timing (U2) may be detected by blind decoding;
determining the second timing (U2) using orthogonal multiplexing for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of the UL transmission, using an orthogonal mask sequence to index an indicator contained in a DCI of a UL scheduling grant, or a numerical value of an interval corresponding to the second timing (U2) that is predefined according to a length of a TTI of the UL/DL transmission and a number of TTIs of the UL transmission; and
the multiple ACK/NACK feedbacks for the TTIs of the multiple different UL transmissions comprise a combined feedback, and an uplink allocation index is used in the DCI of the UL scheduling grant to indicate a location of the corresponding ACK/NACK feedback in the combined feedback.
16. An apparatus for frequency division duplex communication, comprising:
determining means configured to determine at least one of a timing relationship between downlink DL transmissions and corresponding uplink UL transmissions and a timing relationship between UL transmissions and corresponding DL transmissions;
performing means configured to perform at least one of an UL transmission corresponding to the DL transmission and a DL transmission corresponding to the UL transmission according to the determined timing relationship;
wherein a length of a transmission time interval, TTI, of a UL transmission and a length of a TTI of a DL transmission in the frequency division duplex communication are set to be asymmetric.
17. The apparatus of claim 16, further comprising:
setting means configured to change a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication.
18. The apparatus of claim 16 or 17, further comprising:
a first selection device configured to determine a timing relationship between the DL transmissions and corresponding UL transmissions using at least one selected from the following:
(a) for the TTI of the nth DL transmission, selecting as the reference point the TTI of the first one of the UL transmissions numbered m that starts after or at the end of the TTI of the nth DL transmission, and determining the TTI of the m + k UL transmissions as the TTI corresponding to the TTI of the nth DL transmission for which the UL transmission of the respective UL transmission is to take place;
(b) for the TTI of the nth DL transmission, selecting a last TTI of the UL transmission numbered m that starts completely before the end of the TTI of the nth DL transmission as a reference point, and determining the TTI of the m + k UL transmissions as the TTI of the UL transmission corresponding to the TTI of the nth DL transmission for the corresponding UL transmission;
(c) taking an end of a TTI of a DL transmission at an x-th orthogonal frequency division multiplexing symbol, OS, as a reference point, and determining an x + k-th OS as a starting position of a TTI of a UL transmission corresponding to the TTI of the DL transmission for which the corresponding UL transmission is made;
(d) selecting a TTI of an nth DL transmission as a reference point, and taking a TTI of a first UL transmission that begins after an end of a TTI of an n + k DL transmission as a TTI, corresponding to the TTI of the nth DL transmission, for UL transmission of the respective UL transmission; and
(e) selecting a TTI of an nth DL transmission as a reference point, and taking a TTI of a first UL transmission that begins after or at the beginning of the TTI of an n + k th DL transmission as a TTI corresponding to the TTI of the nth DL transmission for the UL transmission of the respective UL transmission.
19. The apparatus of claim 18, further comprising:
second selecting means configured to, in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication:
calculating a reference point according to the length of the changed TTI and using one of the manners (a) - (c) to determine a timing relationship between the DL transmission and a corresponding UL transmission; or
Determining a timing relationship between the DL transmission and a corresponding UL transmission using one of manners (d) - (e).
20. The apparatus of claim 16 or 17, further comprising:
a third selecting means configured to determine a timing relationship between the UL transmission and a corresponding DL transmission using at least one selected from the following:
(f) for the mth TTI of the UL transmission, selecting as the reference point the TTI of the first N-numbered DL transmission that begins after or at the end of the mth TTI, and determining the TTI of the (n + k) -th DL transmission as the TTI corresponding to the mth TTI of the UL transmission for the DL transmission for which the respective DL transmission is made;
(g) for the mth TTI of UL transmission, selecting a last TTI of the DL transmission numbered n starting completely before the end of the mth TTI of UL transmission as a reference point, and determining the TTI of the n + k DL transmissions as the TTI corresponding to the mth TTI of UL transmission for the DL transmission of the corresponding DL transmission;
(h) taking an end of a TTI of a UL transmission at an x-th OS as a reference point, and determining an x + k-th OS as a start position of a TTI of a DL transmission for the DL transmission corresponding to the TTI of the UL transmission;
(i) selecting a TTI of an mth UL transmission as a reference point, and taking a TTI of a first DL transmission that starts after an end of a TTI of an m + k UL transmission as a TTI, corresponding to the TTI of the mth UL transmission, for a DL transmission of the respective DL transmission; and
(j) selecting the TTI of the mth UL transmission as the reference point, and taking the TTI of the first DL transmission that starts after or at the beginning of the TTI of the m + k UL transmissions as the TTI of the DL transmission corresponding to the mth UL transmission for the respective DL transmission.
21. The apparatus of claim 20, further comprising:
fourth selecting means configured to, in response to a change in a length of a TTI of a UL transmission or a length of a TTI of a DL transmission in the frequency division duplex communication:
calculating a reference point according to the length of the changed TTI and using one of the manners (f) - (h) to determine a timing relationship between the UL transmission and the corresponding DL transmission; or
Determining a timing relationship between the UL transmission and a corresponding DL transmission using one of manners (i) - (j).
22. The apparatus of claim 18, wherein when the determining means determines a timing relationship between the DL transmissions and corresponding UL transmissions comprises:
determining at least one of the following timings:
(k) a first timing (U1) between a first UL scheduling grant in the DL transmissions and a corresponding UL transmission;
(l) A third timing (U3) between positive acknowledgement/negative acknowledgement (ACK/NACK) in the DL transmission for the respective UL transmission and UL retransmissions; and
(m) a fourth timing (D1) between data transmission in the DL transmissions and ACK/NACK feedback for the respective DL transmissions.
23. The apparatus of claim 20, wherein determining a timing relationship between the UL transmissions and corresponding DL transmissions comprises:
determining a second timing between the UL transmission and ACK/NACK feedback for the UL transmission (U2).
24. The apparatus of claim 22, wherein determining at least one of the timings (k) - (m) comprises:
(n) determining the first timing (U1) according to one of the following:
for asynchronous UL scheduling grants, determining the first timing (U1) by an indicator of the first timing (U1) contained in downlink control information, DCI, of the first UL scheduling grant for the respective UL transmission using an explicit notification mode, the indicator being to indicate an uplink index of the respective UL transmission, the uplink index indicating a value of an interval to which the first timing (U1) corresponds; and
determining the first timing (U1) using an implicit notification pattern for a synchronized UL scheduling grant, wherein a numerical value of the interval for the first timing (U1) is predefined according to a length of a TTI of the UL/DL transmission,
(o) determining the third timing (U3) according to one of the following:
for asynchronous UL retransmissions, determining the third timing (U3) by an indicator of the third timing (U3) contained in DCI of the ACK/NACK for the respective UL transmission using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmissions, the uplink index indicating a value of an interval to which the third timing (U3) corresponds;
for asynchronous UL retransmissions, when there is only pure ACK/NACK feedback for the respective UL transmission, determining the third timing (U3) by an indicator of the third timing (U3) contained in the pure ACK/NACK feedback using an explicit notification mode, the indicator to indicate an uplink index of the UL retransmission, the uplink index indicating a value of an interval to which the third timing (U3) corresponds;
for asynchronous UL retransmissions, determining the third timing (U3) by the indicator of the third timing (U3) contained in DCI of the first UL scheduling grant using an explicit notification mode when there is only the ACK/NACK feedback for the corresponding UL transmission; and
determining the third timing (U3) using an implicit notification pattern for a synchronized UL retransmission, wherein a value of an interval to which the third timing (U3) corresponds is predefined according to a length of a TTI of the UL/DL transmission,
(p) determining the fourth timing (D1) according to one of the following:
for ACK/NACK feedback for asynchronous DL transmissions, determining the fourth timing (D1) by an indicator of the fourth timing (D1) contained in DCI of a scheduling grant for a DL transmission using an explicit notification mode, the indicator indicating an uplink index of the ACK/NACK for the corresponding DL transmission, the uplink index indicating a value of an interval to which the fourth timing (D1) corresponds; and
determining the fourth timing (D1) using an implicit notification pattern for ACK/NACK feedback for synchronized DL transmissions, wherein a numerical value of an interval to which the fourth timing (D1) corresponds is predefined according to a length of a TTI of the UL/DL transmission.
25. The apparatus of claim 23, wherein determining the second timing (U2) comprises:
determining the second timing (U2) according to one of the following:
for ACK/NACK feedback for asynchronous UL transmissions, determining the second timing (U2) by DCI of a second UL scheduling grant, the DCI being used to determine whether retransmissions are required, the user equipment obtaining the DCI by blind decoding a TTI of each DL transmission, an indicator of an identifier of a UL hybrid automatic repeat request process being included in the DCI;
for ACK/NACK feedback for asynchronous UL transmissions, determining the second timing (U2) by an indicator of the second timing (U2) contained in DCI of a first UL scheduling grant, using an explicit notification mode, the indicator to indicate a downlink index of the corresponding DL transmission, the downlink index indicating a value of an interval to which the second timing (U2) corresponds; and
determining the second timing (U2) using an implicit notification pattern for ACK/NACK feedback for a synchronized UL transmission, wherein a numerical value of an interval to which the second timing (U2) corresponds is predefined according to a length of a TTI of the UL/DL transmission.
26. The apparatus of claim 24, wherein determining the third timing (U3) for asynchronous UL retransmissions using an explicit notification mode when only the pure ACK/NACK feedback for the respective UL transmission is present, by an indicator of the third timing (U3) included in the pure ACK/NACK feedback, comprises:
the indicator of the third timing (U3) included in the pure ACK/NACK feedback uses one of an orthogonal mask sequence, a phase rotation sequence, or a start position of a pseudo-random sequence.
27. The apparatus of claim 24, wherein determining the third timing (U3) using an implicit notification mode for synchronized UL retransmissions further comprises:
when the ACK/NACK feedback of the asynchronous DL transmission is a pure ACK/NACK feedback, an offset indicator using one of a start position of an orthogonal mask sequence, a phase rotation sequence, or a pseudo random sequence as a value of an interval corresponding to the third timing (U3) is used to determine an offset of a value of an interval corresponding to the third timing (U3).
28. The apparatus of claim 24, wherein notifying the first timing (U1) using an implicit notification mode for the synchronized UL scheduling grant comprises:
determining an offset value for the first timing (U1) by an offset indicator used in DCI for the synchronized UL scheduling grant, the offset indicator indicating an uplink index offset indicating an offset value for the first timing (U1); or
Determining an offset value for the first timing (U1) by an indicator of resources of the allocated TTI of the plurality of UL transmissions in the DCI for the synchronized UL scheduling grant.
29. The apparatus of claim 24, wherein determining the fourth timing (D1) using an implicit notification pattern for ACK/NACK feedback of the synchronized DL transmission further comprises at least one of:
using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of TTIs for a plurality of different DL transmissions, and including in a DCI of a scheduling grant an indicator of a frequency offset for indicating a frequency offset index of a physical uplink control channel, or a numerical value of an interval corresponding to the fourth timing (D1) may be predefined according to a length of a TTI of the UL/DL transmission and a number of the TTI of the DL transmission;
using orthogonal multiplexing for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of DL transmissions, using an orthogonal mask sequence to index an indicator contained in DCI of a scheduling grant of a DL transmission, or a numerical value of an interval corresponding to the fourth timing (D1) may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the DL transmission; and
the plurality of ACK/NACK feedbacks for the TTIs of the plurality of different DL transmissions comprise a combined feedback, a downlink allocation index is used in the DCI of the scheduling grant of the DL transmission, the downlink allocation index indicating a location of the respective ACK/NACK feedback in the combined feedback.
30. The apparatus of claim 25, wherein determining the second timing (U2) using an implicit notification mode for ACK/NACK feedback for the synchronized UL transmission further comprises at least one of:
using a plurality of frequency offsets for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of the UL transmission, and determining the second timing (U2) by including an indicator of the frequency offset in a DCI of a UL scheduling grant, the indicator for indicating a frequency offset index of a physical hybrid automatic repeat request indication channel, or a value of an interval corresponding to the second timing (U2) may be predefined according to a length of the TTI of the UL/DL transmission and a number of the TTI of the UL transmission, or a value of an interval corresponding to the second timing (U2) may be detected by blind decoding;
determining the second timing (U2) using orthogonal multiplexing for a plurality of ACK/NACK feedbacks for a plurality of different TTIs of the UL transmission, using an orthogonal mask sequence to index an indicator contained in a DCI of a UL scheduling grant, or a numerical value of an interval corresponding to the second timing (U2) that is predefined according to a length of a TTI of the UL/DL transmission and a number of TTIs of the UL transmission; and
the multiple ACK/NACK feedbacks for the TTIs of the multiple different UL transmissions comprise a combined feedback, and an uplink allocation index is used in the DCI of the UL scheduling grant to indicate a location of the corresponding ACK/NACK feedback in the combined feedback.
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