CN111050408B - Feedback method and system for uplink transmission, base station and user equipment - Google Patents

Feedback method and system for uplink transmission, base station and user equipment Download PDF

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CN111050408B
CN111050408B CN201911343821.4A CN201911343821A CN111050408B CN 111050408 B CN111050408 B CN 111050408B CN 201911343821 A CN201911343821 A CN 201911343821A CN 111050408 B CN111050408 B CN 111050408B
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user equipment
downlink control
control signaling
base station
automatic repeat
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CN111050408A (en
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邓云
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling

Abstract

The invention provides a feedback method and a feedback system for uplink transmission, a base station and user equipment. The method comprises the following steps: the user equipment sends uplink data to the base station on the unlicensed spectrum; the user equipment acquires the position of the hybrid automatic repeat request feedback aiming at the user equipment in a downlink control signaling or a physical HARQ indication channel; the user equipment receives a downlink control signaling or a physical HARQ indication channel sent by a base station after receiving the uplink data, wherein the downlink control signaling or the physical HARQ indication channel comprises hybrid automatic repeat request feedback aiming at least one user equipment; and the user equipment analyzes the hybrid automatic repeat request feedback aiming at the user equipment from the downlink control signaling or the physical HARQ indication channel according to the position of the hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling or the physical HARQ indication channel. The invention can accurately feed back the transmission of the user equipment on the unlicensed spectrum.

Description

Feedback method and system for uplink transmission, base station and user equipment
The application is a divisional application with the application date of 2016, 4 and 1, the application number of 201610205657.0, and the name of 'feedback method and system for uplink transmission, base station and user equipment'.
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a feedback method and system for uplink transmission, a base station, and a user equipment.
Background
In an existing LTE (Long Term Evolution) system, a base station schedules transmission of Downlink data and transmission of uplink data through DCI (Downlink Control Information). For the transmission of uplink data, the base station transmits a Grant (Grant) for the UE to perform uplink data transmission through DCI format 0.
In FDD (Frequency Division duplex) LTE, a UE receives DCI 0 belonging to the UE in a subframe n, acquires an uplink transmission grant, and performs data transmission in a subframe n +4 according to information in the grant in a designated resource. The base station analyzes uplink data sent by the UE, and if the uplink data can be accurately received, the base station indicates ACK on a PHICH (Physical Hybrid ARQ Indicator Channel) of a subframe n + 8; if the uplink data cannot be accurately received or is not received, the base station indicates NACK on the PHICH of subframe n + 8.
In TDD (Time Division duplex) LTE, a UE receives DCI 0 belonging to the UE in subframe n, performs data transmission in subframe n + k (k > -4), and receives a PHICH in subframe n + k + l (l > -4).
The transmission of PHICH is organized in the form of PHICH groups, a plurality of PHICH channels in 1 PHICH group occupy the same time-frequency domain physical resource, and the multiplexing mode of orthogonal spread spectrum sequences is adopted. One PHICH channel is determined by the identity of the PHICH group and the identity within the group. The UE determines the identifier of the PHICH group and the intra-group identifier according to the position of the physical resource block occupied by the UE for transmitting the uplink data (the index of the minimum physical resource block in which the UE transmits the uplink data in the first slot) and the index of a DMRS (Demodulation reference signal).
Generally, LTE is always deployed in a licensed spectrum owned by an operator, but spectrum resources are very scarce, so the operator starts to consider fully utilizing an unlicensed spectrum, Before using the unlicensed spectrum, an LBT (Listen Before Talk) mechanism needs to be adopted to monitor whether other users, such as a WLAN, are using, and if a channel is busy, waiting is needed; if the channel is idle, it may be used for a period of time. When the use is finished, the frequency spectrum needs to be released, and then the use right of the next frequency spectrum is monitored and acquired again.
When the uplink channel also adopts an unlicensed spectrum, the UE needs to adopt an LBT mechanism in order to know whether the spectrum can be used for uplink data transmission, and once transmission is possible, the base station needs to send ACK/NACK to the UE in order to know whether transmission is successful. When using the unlicensed spectrum, the UE generally uses the licensed spectrum in conjunction with the unlicensed spectrum to perform carrier aggregation. Therefore, the UE can receive the PHICH on the PCell (primary cell, located in a licensed spectrum) on the licensed spectrum in order to know whether the UE has successfully transmitted on the uplink unlicensed spectrum, and can also receive feedback on the unlicensed spectrum. Generally, when a base station schedules UEs for uplink transmission, it needs to check whether PHICH resources of different UEs collide with each other, and can send downlink control signaling (i.e., DCI) only when there is no collision.
In the process of implementing the present invention, the inventors found that at least the following technical problems exist in the prior art:
when the UE uses the unlicensed spectrum to perform uplink transmission, the base station does not know when the UE will perform transmission on the unlicensed spectrum, if the existing mechanism is adopted, the identifier and the in-group identifier of the PHICH group on the PHICH obtained by the UE may conflict with the identifiers and the in-group identifiers of the PHICH groups of other UEs, and HARQ (Hybrid Automatic Repeat Request) feedback resources of the UE by the base station may conflict with HARQ feedback resources of other UEs, so that the base station cannot accurately feedback the transmission of the UE on the unlicensed spectrum.
Disclosure of Invention
The feedback method and system for uplink transmission, the base station and the user equipment can accurately feed back the transmission of the user equipment on the unlicensed spectrum.
In a first aspect, the present invention provides a feedback method for uplink transmission, including:
the user equipment sends uplink data to the base station on the unlicensed spectrum;
the user equipment receives a downlink control signaling or a physical HARQ indication channel sent by a base station after receiving the uplink data, wherein the downlink control signaling or the physical HARQ indication channel comprises hybrid automatic repeat request feedback aiming at least one user equipment;
And the user equipment analyzes the hybrid automatic repeat request feedback aiming at the user equipment from the downlink control signaling or the physical HARQ indication channel.
Optionally, before the ue receives a downlink control signaling or a physical HARQ indicator channel sent by the base station after receiving the uplink data, the method further includes:
the user equipment acquires the position of the hybrid automatic repeat request feedback aiming at the user equipment in a downlink control signaling or a physical HARQ indication channel;
the analyzing, by the ue, the HARQ feedback for the ue from the downlink control signaling or the physical HARQ indicator channel includes: and the user equipment analyzes the hybrid automatic repeat request feedback aiming at the user equipment from the downlink control signaling or the physical HARQ indication channel according to the position of the hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling or the physical HARQ indication channel.
Optionally, the downlink control signaling includes hybrid automatic repeat request feedback for a plurality of user equipments;
the step of the user equipment acquiring the position of the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling comprises the following steps: the user equipment receives a radio resource control signaling sent by a base station, wherein the radio resource control signaling comprises a shared radio network temporary identifier and a position of hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling;
The receiving, by the user equipment, the downlink control signaling sent by the base station after receiving the uplink data includes: the user equipment receives a downlink control signaling which is sent by a base station after receiving the uplink data and scrambled by the temporary identifier of the shared wireless network;
the analyzing, by the ue, the harq feedback for the ue from the downlink control signaling according to the position of the harq feedback for the ue in the downlink control signaling includes: and the user equipment analyzes the hybrid automatic repeat request feedback aiming at the user equipment from the downlink control signaling by using the shared wireless network temporary identifier according to the position of the hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling.
Optionally, the downlink control signaling includes a hybrid automatic repeat request feedback for a user equipment;
the user equipment acquiring the position of the hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling comprises the following steps: the user equipment acquires hybrid automatic repeat request feedback aiming at one user equipment in the downlink control signaling as hybrid automatic repeat request feedback aiming at the user equipment;
The receiving, by the user equipment, the downlink control signaling sent by the base station after receiving the uplink data includes: the user equipment receives a downlink control signaling which is sent by a base station after receiving the uplink data and scrambled by a special wireless network temporary identifier;
the analyzing, by the ue, the harq feedback for the ue from the downlink control signaling according to the position of the harq feedback for the ue in the downlink control signaling includes: and the user equipment analyzes the downlink control signaling by using the special wireless network temporary identifier to obtain hybrid automatic repeat request feedback aiming at the user equipment.
Optionally, the obtaining, by the ue, a position of a hybrid automatic repeat request feedback for the ue in the downlink control signaling includes: and the user equipment calculates the position of the hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling according to the identification of the user equipment or the minimum physical resource block index used by the user equipment during uplink transmission.
Optionally, the obtaining, by the ue, a position of HARQ feedback for the ue in a physical HARQ indicator channel includes: the user equipment receives a radio resource control signaling sent by a base station, wherein the radio resource control signaling comprises a position of a physical HARQ (hybrid automatic repeat request) indicator channel resource reserved for the user equipment, and the position of the physical HARQ indicator channel resource comprises a physical HARQ indicator channel group identifier on a physical HARQ indicator channel and an identifier in the group;
The analyzing, by the ue, the HARQ feedback for itself from the physical HARQ indicator channel according to the position of the HARQ feedback for itself in the physical HARQ indicator channel includes: and the user equipment analyzes hybrid automatic repeat request feedback aiming at the user equipment from the physical HARQ indication channel according to the position of the reserved physical HARQ indication channel resource.
In a second aspect, the present invention provides a user equipment, comprising:
a first sending unit, configured to send uplink data to a base station on an unlicensed spectrum;
a first receiving unit, configured to receive a downlink control signaling or a physical HARQ indicator channel sent by a base station after receiving the uplink data, where the downlink control signaling or the physical HARQ indicator channel includes HARQ feedback for at least one ue;
and the analysis unit is used for analyzing the hybrid automatic repeat request feedback aiming at the downlink control signaling or the physical HARQ indication channel.
Optionally, the user equipment further includes:
an obtaining unit, configured to obtain, before the first receiving unit receives a downlink control signaling or a physical HARQ indicator channel sent by a base station after receiving the uplink data, a position of a hybrid automatic repeat request feedback for the first receiving unit in the downlink control signaling or the physical HARQ indicator channel;
The analysis unit is configured to analyze the HARQ feedback for the hybrid automatic repeat request according to the position of the HARQ feedback for the hybrid automatic repeat request in the downlink control signaling or the physical HARQ indicator channel.
Optionally, the downlink control signaling includes hybrid automatic repeat request feedback for multiple user equipments;
the acquiring unit is configured to receive a radio resource control signaling sent by a base station, where the radio resource control signaling includes a shared radio network temporary identifier and a position of a hybrid automatic repeat request feedback for the user equipment in the downlink control signaling;
the first receiving unit is configured to receive a downlink control signaling which is sent by a base station after receiving the uplink data and scrambled by the temporary identifier of the shared wireless network;
the analysis unit is configured to analyze the harq feedback for the ue from the downlink control signaling by using the shared radio network temporary identifier according to the position of the harq feedback for the ue in the downlink control signaling.
Optionally, the downlink control signaling includes a hybrid automatic repeat request feedback for a user equipment;
the acquiring unit is configured to acquire hybrid automatic repeat request feedback for one user equipment included in the downlink control signaling as hybrid automatic repeat request feedback for the user equipment;
the first receiving unit is configured to receive a downlink control signaling which is sent by a base station after receiving the uplink data and scrambled by a private radio network temporary identifier;
and the analysis unit is used for analyzing the downlink control signaling by using the special wireless network temporary identifier to obtain hybrid automatic repeat request feedback aiming at the downlink control signaling.
Optionally, the obtaining unit is configured to calculate, according to the identifier of the user equipment or a minimum physical resource block index used in uplink transmission of the user equipment, a position of a hybrid automatic repeat request feedback for the user equipment in the downlink control signaling.
Optionally, the obtaining unit is configured to receive a radio resource control signaling sent by a base station, where the radio resource control signaling includes a location of a physical HARQ indicator channel resource reserved for the ue, where the location of the physical HARQ indicator channel resource includes a physical HARQ indicator channel group identifier on a physical HARQ indicator channel and an intra-group identifier;
And the analysis unit is used for analyzing the hybrid automatic repeat request feedback aiming at the physical HARQ indication channel from the physical HARQ indication channel according to the position of the reserved physical HARQ indication channel resource.
In a third aspect, the present invention provides a base station, including:
a second receiving unit, configured to receive uplink data sent by a user equipment on an unlicensed spectrum;
a second sending unit, configured to send a downlink control signaling or a physical HARQ indicator channel to the ue after the second receiving unit receives the uplink data, where the downlink control signaling or the physical HARQ indicator channel includes HARQ feedback for at least one ue.
Optionally, the downlink control signaling includes hybrid automatic repeat request feedback for a plurality of user equipments;
the base station further comprises:
a third sending unit, configured to send a radio resource control signaling to a user equipment, where the radio resource control signaling includes a shared radio network temporary identifier and a position of a hybrid automatic repeat request feedback for the user equipment in the downlink control signaling;
and the second sending unit is configured to send, to the user equipment, the downlink control signaling scrambled by the temporary identifier of the shared radio network after the second receiving unit receives the uplink data.
Optionally, the downlink control signaling includes a hybrid automatic repeat request feedback for a user equipment;
and the second sending unit is configured to send, to the user equipment, the downlink control signaling scrambled by the private radio network temporary identifier after the second receiving unit receives the uplink data.
Optionally, the base station further includes:
a fourth sending unit, configured to send a radio resource control signaling to a ue, where the radio resource control signaling includes a location of a physical HARQ indicator channel resource reserved for the ue, and the location of the physical HARQ indicator channel resource includes a physical HARQ indicator channel group identifier on a physical HARQ indicator channel and an intra-group identifier.
In a fourth aspect, the present invention provides a feedback system for uplink transmission, including a user equipment and a base station;
the user equipment is used for sending uplink data to a base station on an unlicensed spectrum, receiving a downlink control signaling or a physical HARQ (hybrid automatic repeat request) indication channel sent by the base station after the uplink data is received, wherein the downlink control signaling or the physical HARQ indication channel comprises hybrid automatic repeat request feedback aiming at least one user equipment, and the hybrid automatic repeat request feedback aiming at the user equipment is analyzed from the downlink control signaling or the physical HARQ indication channel;
The base station is configured to receive uplink data sent by user equipment on an unlicensed spectrum, and send a downlink control signaling or a physical HARQ indicator channel to the user equipment after receiving the uplink data, where the downlink control signaling or the physical HARQ indicator channel includes HARQ feedback for at least one user equipment.
The feedback method and system for uplink transmission, the base station and the user equipment provided in the embodiments of the present invention are configured such that the user equipment sends uplink data to the base station on an unlicensed spectrum, and obtains a position of a hybrid automatic repeat request feedback for itself in a downlink control signaling or a physical HARQ indicator channel, after receiving the uplink data, the base station sends a downlink control signaling or a physical HARQ indicator channel including a hybrid automatic repeat request feedback for at least one user equipment to the user equipment, and the user equipment parses a hybrid automatic repeat request feedback for itself from the downlink control signaling or the physical HARQ indicator channel according to the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel. Compared with the prior art, the method and the device can accurately feed back the transmission of the user equipment on the unlicensed spectrum, and simultaneously avoid interference on the feedback of the hybrid automatic repeat request obtained by other user equipment.
Drawings
Fig. 1 is a flowchart of a feedback method for uplink transmission according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a base station according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a feedback system for uplink transmission according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides a feedback method for uplink transmission, as shown in fig. 1, the method includes:
s11, the user equipment sends uplink data to the base station on the unlicensed spectrum;
S12, the user equipment acquires the position of the HARQ feedback aiming at the user equipment in the downlink control signaling or the PHICH;
s13, the user equipment receives a downlink control signaling or PHICH sent by the base station after receiving the uplink data, wherein the downlink control signaling or PHICH comprises HARQ feedback aiming at least one user equipment;
s14, the user equipment analyzes the HARQ feedback aiming at the user equipment from the downlink control signaling or the PHICH according to the position of the HARQ feedback aiming at the user equipment in the downlink control signaling or the PHICH.
In the feedback method for uplink transmission provided in the embodiment of the present invention, a user equipment sends uplink data to a base station on an unlicensed spectrum, and obtains a position of HARQ feedback for itself in a downlink control signaling or a PHICH, after receiving the uplink data, the base station sends the downlink control signaling or the PHICH including the HARQ feedback for at least one user equipment to the user equipment, and the user equipment resolves HARQ feedback for itself from the downlink control signaling or the PHICH according to the position of the HARQ feedback for itself in the downlink control signaling or the PHICH. Compared with the prior art, the method and the device can accurately feed back the transmission of the user equipment on the unlicensed spectrum, and simultaneously avoid interference generated by obtaining the HARQ feedback by other user equipment.
The HARQ feedback for itself refers to HARQ feedback for the uplink data transmitted by itself.
Optionally, the downlink control signaling may include HARQ feedback for multiple user equipments;
the method includes the steps that the user equipment receives Radio Resource Control (RRC) signaling sent by a base station, wherein the RRC signaling comprises a shared Radio Network Temporary Identity (RNTI) and the position of HARQ feedback aiming at the user equipment (namely the HARQ feedback of uplink data transmitted by the user equipment) in the downlink Control signaling, and therefore the position of the HARQ feedback aiming at the user equipment in the downlink Control signaling is obtained;
the user equipment receives a downlink control signaling which is sent by a base station after receiving the uplink data and scrambled by the shared RNTI;
the ue uses the shared RNTI to resolve the HARQ feedback for itself from the downlink control signaling according to the position of the HARQ feedback for itself in the downlink control signaling.
The UE supports unlicensed frequency and licensed frequency for carrier aggregation, and supports LBT, so as to obtain the use right of the unlicensed frequency for a period of time. The continuous use time set for the unauthorized frequency in different countries is not exactly the same, for example, in japan, the continuous use time is 4ms on the unauthorized frequency, and other countries may be 8ms or 10 ms.
The UE accesses the network through the licensed frequency F1, and establishes an RRC connection. Due to the service requirement, the serving base station configures an unlicensed frequency for the UE, so that the UE can perform uplink data transmission by using the unlicensed frequency.
The UE needs to go through LBT to transmit on the unlicensed frequency when the UE detects that the unlicensed frequency is in an idle state (the detected signal strength is below a predetermined threshold, which may be configured by the base station). Since the time during which the UE can obtain uplink transmission is limited, it is assumed here that the scheduling decision of uplink transmission is also made by the base station and sent to the UE, and it is necessary to look at the LBT result when the UE can perform uplink transmission according to the decision of uplink scheduling.
Specifically, when the UE performs data transmission on a subframe n on the unlicensed spectrum, the UE receives HARQ feedback through a PDCCH (Physical Downlink Control Channel) in a subframe n + K (K is 4, FDD; K > -4, TDD). At this time, if the base station sends HARQ feedback to the UE on the authorized frequency spectrum, the UE receives the HARQ feedback in a subframe n + k according to the time sequence relation; if the base station sends the HARQ feedback to the UE on the unlicensed spectrum, the UE receives the HARQ feedback on the subframe n + k or a subframe after the subframe n + k, because the base station needs to perform LBT to obtain the right to use the unlicensed spectrum, the UE may know whether to obtain the HARQ feedback from the licensed spectrum or the unlicensed spectrum through the configuration of the base station. After receiving uplink data sent by the UE, the base station needs to feed back ACK if the uplink data can be correctly decoded; if the decoding cannot be successfully performed, a NACK needs to be fed back.
If the downlink control signaling may include feedback for 4 UE uplink transmissions, the feedback for each UE uplink transmission occupies different bits. For example: the downlink control signaling comprises 20 bits, each 5 bits are used for indicating the HARQ feedback of one UE, and the base station can indicate the HARQ feedback position of the UE in the downlink control signaling and the shared RNTI to each UE through RRC signaling. The base station may indicate the position of the HARQ feedback of the UE in the downlink control signaling to the UE before the user equipment sends uplink data to the base station on the unlicensed spectrum in step S11, or in parallel with step S11, it is only necessary to ensure that the UE is notified before receiving the HARQ feedback. The base station can send a downlink control signaling containing the HARQ feedback on a serving cell located in an authorized spectrum; and the serving cell on the unlicensed spectrum may also send a downlink control signaling containing the HARQ feedback to the UE. And the serving cells for sending the HARQ feedback are all the serving cells configured for the UE by the base station.
Optionally, the downlink control signaling may include HARQ feedback for only one ue;
the user equipment acquires HARQ feedback aiming at one user equipment in the downlink control signaling as HARQ feedback aiming at the user equipment, so that the position of the HARQ feedback aiming at the user equipment in the downlink control signaling is acquired, a cell at a specific position in the downlink control signaling is used for indicating the HARQ feedback, and if 1 bit is adopted at a certain position to indicate ACK/NACK;
The user equipment receives a downlink control signaling which is sent by a base station after receiving the uplink data and is scrambled by a special RNTI; the special RNTI is a special RNTI such as a Cell RNTI allocated by a base station when each UE is accessed to a Cell;
and the user equipment analyzes the downlink control signaling by using the special RNTI to obtain HARQ feedback aiming at the user equipment.
Because the downlink control signaling only includes HARQ feedback for the user equipment, when the UE receives the downlink control signaling sent by the base station, the HARQ feedback for the UE can be directly analyzed from the downlink control signaling by using the special RNTI.
Optionally, the obtaining, by the ue, a position of HARQ feedback for the ue in the downlink control signaling includes: and the user equipment calculates the position of HARQ feedback aiming at the user equipment in the downlink control signaling according to the identification of the user equipment or the minimum physical resource block index used by the user equipment during uplink transmission. When a base station indicates HARQ feedback by using a downlink control signaling scrambled by a shared RNTI, UE needs to determine the position of the HARQ feedback of the UE in the downlink control signaling, and at the moment, the position of the HARQ feedback aiming at the UE in the downlink control signaling is calculated by using an identifier of the UE or a minimum physical resource block index used by the UE in uplink transmission.
Specifically, calculating the position of the HARQ feedback for the user equipment in the downlink control signaling according to the identifier of the user equipment may be: UE _ ID mod 4; calculating the position of the HARQ feedback for the user equipment according to the minimum physical resource block index used in the uplink transmission of the user equipment in the downlink control signaling may be: PRB index mod 4.
At this time, the base station may determine which UE transmits the uplink data according to the UE-specific DMRS included in the received uplink data transmitted by the UE, and may transmit HARQ feedback (ACK or NACK) to the UE at a corresponding position in the DCI according to the reception result.
Optionally, the obtaining, by the user equipment, a position of HARQ feedback for the user equipment in the PHICH includes: the user equipment receives RRC signaling sent by a base station, wherein the RRC signaling comprises a position of a PHICH resource reserved for the user equipment, and the position of the PHICH resource comprises a PHICH group identifier on the PHICH and an in-group identifier;
the user equipment analyzes the HARQ feedback for the user equipment from the PHICH according to the position of the HARQ feedback for the user equipment in the PHICH, and the method comprises the following steps: and the user equipment analyzes HARQ feedback aiming at the user equipment from the PHICH according to the position of the reserved PHICH resource. The base station indicating the location of the HARQ feedback of the UE in the PHICH to the UE may be before the user equipment transmits uplink data to the base station on the unlicensed spectrum in step S11, or in parallel with step S11, only to ensure that the UE is notified before receiving the HARQ feedback.
Specifically, when a base station selects a certain UE to perform uplink transmission by using an unlicensed frequency, a resource is reserved in the PHICH in advance for HARQ feedback of the UE, for example, the PHICH resource located in the 4 th PHICH group and identified as 2 in the group is used for feedback of data transmission of the UE on the unlicensed frequency. And the base station indicates PHICH resources which are positioned in the 4 th PHICH group and are identified as 2 in the group to the UE through signaling, so that the UE receives HARQ feedback at a designated position after transmitting uplink data. After reserving the PHICH resource of (4, 2), the base station needs to avoid that the PHICH resource calculated by other UEs according to the existing mechanism is (4, 2) when scheduling other UEs for uplink transmission (the minimum allocated PRB for uplink transmission).
Wherein, the base station can reserve HARQ feedback resources of UE uplink transmission on the unlicensed frequency on a PHICH positioned on a serving cell of the licensed spectrum or a serving cell of the unlicensed spectrum.
It should be noted that, if the UE receives the grant transmitted on the unlicensed spectrum in the subframe n, and after performing LBT, if the UE can perform uplink transmission in the subframe n +4, the UE obtains the PHICH group identifier and the intra-group identifier according to the following algorithm, and obtains its corresponding ACK/NACK in the PHICH according to the PHICH group identifier and the intra-group identifier; or if the UE can perform uplink transmission in a period of time beginning at the subframe n +4 (e.g., subframes n +4, n +5, n +6), the UE acquires its corresponding ACK/NACK in the designated PHICH according to the following algorithm. The period of time here may be preset by a protocol or set by the base station through signaling.
If the UE cannot perform uplink transmission in the subframe n +4 or within a period of time beginning at the subframe n +4, that is, the result of the UE performing LBT does not allow the UE to perform uplink transmission in the subframe 4 or a period of time after the LBT, the UE needs to obtain feedback of uplink transmission according to the method provided by the above embodiment when the UE cannot perform uplink transmission after the LBT.
Specifically, the transmission of the PHICH is organized in PHICH groups, and multiple PHICH channels in 1 PHICH group occupy the same time-frequency domain physical resource, and an orthogonal spreading sequence multiplexing mode is adopted. As in a normal CP (Cyclic Prefix), one PHICH group multiplexes 8 PHICH channels, i.e., ACK/NACK for its uplink transmission can be indicated to 8 UEs (assuming that one UE transmits only one transport block). One PHICH channel is identified by PHICH group and intra-group identification (nPgr) H o I u C p H ,ns P e H q ICH ) And (4) jointly determining. The UE determines the identifier of the PHICH group and the intra-group identifier according to the position of the physical resource block occupied by the UE for transmitting the uplink data (the index of the minimum physical resource block in which the UE transmits the uplink data in the first slot) and the index of the DMRS (Demodulation Reference Signal). The method specifically comprises the following two formulas:
Figure BDA0002332813220000131
Figure BDA0002332813220000132
wherein, I lowest Minimum PRB index, n, used for uplink transmission of UE in first time slot DMRS Cyclic Shift (Cyclic Shift) of DMRS used for the UE, the last term of equation (1) indicates the number of PHICH groups, and the last term of equation (2) indicates the size of a spreading factor at the time of PHICH modulation.
An embodiment of the present invention further provides a user equipment, as shown in fig. 2, where the user equipment includes:
a first sending unit 21, configured to send uplink data to a base station on an unlicensed spectrum;
an obtaining unit 22, configured to obtain a position of HARQ feedback for itself in a downlink control signaling or a PHICH;
a first receiving unit 23, configured to receive a downlink control signaling or a PHICH sent by a base station after receiving the uplink data, where the downlink control signaling or the PHICH includes HARQ feedback for at least one user equipment;
and the analyzing unit 24 is configured to analyze the HARQ feedback for the ue from the downlink control signaling or the PHICH according to the position of the HARQ feedback for the ue in the downlink control signaling or the PHICH.
The user equipment provided by the embodiment of the invention sends uplink data to the base station on the unlicensed spectrum, acquires the position of HARQ feedback aiming at the user equipment in a downlink control signaling or PHICH, receives the downlink control signaling or PHICH which is sent by the base station after receiving the uplink data and comprises the HARQ feedback aiming at least one user equipment, and analyzes the HARQ feedback aiming at the user equipment from the downlink control signaling or PHICH according to the position of the HARQ feedback aiming at the user equipment in the downlink control signaling or PHICH. Compared with the prior art, the method and the device can accurately feed back the transmission of the user equipment on the unlicensed spectrum, and simultaneously avoid interference generated by obtaining the HARQ feedback by other user equipment.
Optionally, the downlink control signaling includes HARQ feedback for multiple user equipments;
the acquiring unit 22 is configured to receive an RRC signaling sent by a base station, where the RRC signaling includes a shared RNTI and a position of HARQ feedback for the user equipment in the downlink control signaling;
the first receiving unit 23 is configured to receive a downlink control signaling scrambled by the shared RNTI and sent by the base station after receiving the uplink data;
the parsing unit 24 is configured to parse the HARQ feedback for itself from the downlink control signaling by using the shared RNTI according to the position of the HARQ feedback for itself in the downlink control signaling.
Optionally, the downlink control signaling includes HARQ feedback for one ue;
the obtaining unit 22 is configured to obtain HARQ feedback for one user equipment included in the downlink control signaling as HARQ feedback for the user equipment;
the first receiving unit 23 is configured to receive a downlink control signaling which is sent by the base station after receiving the uplink data and scrambled by the special RNTI;
the parsing unit 24 is configured to parse the downlink control signaling by using the special RNTI, so as to obtain HARQ feedback for itself.
Optionally, the obtaining unit 22 is configured to calculate, according to the identifier of the user equipment or a minimum physical resource block index used in uplink transmission of the user equipment, a position of HARQ feedback for the user equipment in the downlink control signaling.
Optionally, the obtaining unit 22 is configured to receive an RRC signaling sent by a base station, where the RRC signaling includes a location of a PHICH resource reserved for the user equipment, where the location of the PHICH resource includes a PHICH group identifier on a PHICH and an intra-group identifier;
the parsing unit 24 is configured to parse HARQ feedback for itself from the PHICH according to the location of the reserved PHICH resource.
An embodiment of the present invention further provides a base station, as shown in fig. 3, where the base station includes:
a second receiving unit 31, configured to receive uplink data sent by a user equipment on an unlicensed spectrum;
a second sending unit 32, configured to send downlink control signaling or PHICH to the user equipment after the second receiving unit receives the uplink data, where the downlink control signaling or PHICH includes HARQ feedback for at least one user equipment.
In the base station provided in the embodiment of the present invention, after receiving uplink data sent by the user equipment on the unlicensed spectrum, the base station sends, to the user equipment, a downlink control signaling or a PHICH including HARQ feedback for at least one user equipment, so that the user equipment can resolve, according to a position of the HARQ feedback for itself in the downlink control signaling or the PHICH, the HARQ feedback for itself from the downlink control signaling or the PHICH. Compared with the prior art, the method and the device can accurately feed back the transmission of the user equipment on the unlicensed spectrum, and simultaneously avoid interference generated by obtaining the HARQ feedback by other user equipment.
Optionally, the downlink control signaling includes HARQ feedback for multiple user equipments.
As shown in fig. 4, the base station further includes:
a third sending unit 33, configured to send an RRC signaling to a user equipment, where the RRC signaling includes a shared RNTI and a position of HARQ feedback for the user equipment in the downlink control signaling;
the second sending unit 32 is configured to send, to the user equipment, the downlink control signaling scrambled by the shared RNTI after the second receiving unit 31 receives the uplink data.
Optionally, the downlink control signaling includes HARQ feedback for one ue;
the second sending unit 32 is configured to send, to the user equipment, the downlink control signaling scrambled by the private RNTI after the second receiving unit 31 receives the uplink data.
Optionally, as shown in fig. 5, the base station further includes:
a fourth sending unit 34, configured to send an RRC signaling to a user equipment, where the RRC signaling includes a location of a PHICH resource reserved for the user equipment, where the location of the PHICH resource includes a PHICH group identifier on the PHICH and an intra-group identifier.
An embodiment of the present invention further provides a feedback system for uplink transmission, as shown in fig. 6, where the system includes a user equipment 61 and a base station 62;
The user equipment 61 is configured to send uplink data to the base station 62 on an unlicensed spectrum, acquire a position of HARQ feedback for itself in a downlink control signaling or PHICH, and receive the downlink control signaling or PHICH sent by the base station 62 after receiving the uplink data, where the downlink control signaling or PHICH includes HARQ feedback for at least one user equipment, and parse HARQ feedback for itself from the downlink control signaling or PHICH according to the position of the HARQ feedback for itself in the downlink control signaling or PHICH;
the base station 62 is configured to receive uplink data sent by the user equipment 61 on an unlicensed spectrum, and send downlink control signaling or PHICH to the user equipment 61 after receiving the uplink data, where the downlink control signaling or PHICH includes HARQ feedback for at least one user equipment.
In the feedback system for uplink transmission provided in the embodiment of the present invention, the user equipment sends uplink data to the base station on the unlicensed spectrum, and obtains a position of HARQ feedback for itself in the downlink control signaling or the PHICH, after receiving the uplink data, the base station sends the downlink control signaling or the PHICH including the HARQ feedback for at least one user equipment to the user equipment, and the user equipment resolves HARQ feedback for itself from the downlink control signaling or the PHICH according to the position of the HARQ feedback for itself in the downlink control signaling or the PHICH. Compared with the prior art, the method and the device can accurately feed back the transmission of the user equipment on the unlicensed spectrum, and simultaneously avoid interference generated by obtaining the HARQ feedback by other user equipment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (4)

1. A feedback method for uplink transmission, comprising:
the user equipment sends uplink data to the base station on the unlicensed spectrum;
the user equipment receives a downlink control signaling which is sent by a base station after receiving the uplink data and is scrambled by a temporary identifier of a shared wireless network, wherein the downlink control signaling comprises hybrid automatic repeat request feedback aiming at a plurality of user equipment;
The user equipment analyzes hybrid automatic repeat request feedback aiming at the user equipment from the downlink control signaling;
before the ue receives the downlink control signaling sent by the base station after receiving the uplink data, the method further includes: the user equipment acquires the position of the hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling; the analyzing, by the ue, the harq feedback for the ue from the downlink control signaling includes: the user equipment analyzes hybrid automatic repeat request feedback aiming at the user equipment from the downlink control signaling by using the shared wireless network temporary identifier according to the position of the hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling;
the step of the user equipment acquiring the position of the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling comprises the following steps: and the user equipment calculates the position of the hybrid automatic repeat request feedback aiming at the user equipment according to the identification of the user equipment in the downlink control signaling.
2. A user device, comprising:
a first sending unit, configured to send uplink data to a base station on an unlicensed spectrum;
A first receiving unit, configured to receive a downlink control signaling scrambled by a temporary identifier of a shared radio network, where the downlink control signaling is sent by a base station after receiving the uplink data, and the downlink control signaling includes harq feedback for multiple ues;
the analysis unit is used for analyzing the hybrid automatic repeat request feedback aiming at the downlink control signaling from the downlink control signaling;
the user equipment further comprises: an obtaining unit, configured to obtain, before the first receiving unit receives a downlink control signaling sent by a base station after receiving the uplink data, a position of a hybrid automatic repeat request feedback for the first receiving unit in the downlink control signaling;
the analysis unit is further configured to analyze the harq feedback for the ue from the downlink control signaling by using the shared radio network temporary identifier according to the position of the harq feedback for the ue in the downlink control signaling;
the acquiring unit is further configured to calculate, according to the identifier of the ue, a position of the harq feedback for the ue in the downlink control signaling.
3. A base station, comprising:
A second receiving unit, configured to receive uplink data sent by a user equipment on an unlicensed spectrum;
a second sending unit, configured to send, to the user equipment, a downlink control signaling scrambled by a shared radio network temporary identifier after the second receiving unit receives the uplink data, where the downlink control signaling includes hybrid automatic repeat request feedback for multiple user equipments;
before the second sending unit sends the downlink control signaling to the user equipment, the user equipment calculates the position of the hybrid automatic repeat request feedback aiming at the user equipment according to the identification of the user equipment in the downlink control signaling; after the second sending unit sends the downlink control signaling to the user equipment, the user equipment uses the shared wireless network temporary identifier to analyze the hybrid automatic repeat request feedback aiming at the user equipment from the downlink control signaling according to the position of the hybrid automatic repeat request feedback aiming at the user equipment in the downlink control signaling.
4. The feedback system of an up transmission, characterized by, including user equipment and base transceiver station;
the user equipment is used for sending uplink data to a base station on an unlicensed spectrum, calculating the position of hybrid automatic repeat request feedback for the user equipment in downlink control signaling according to the identification of the user equipment, receiving the downlink control signaling which is sent by the base station after the uplink data is received and scrambled by a shared wireless network temporary identification, wherein the downlink control signaling comprises the hybrid automatic repeat request feedback for a plurality of user equipment, and analyzing the hybrid automatic repeat request feedback for the user equipment from the downlink control signaling by using the shared wireless network temporary identification according to the position of the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling;
The base station is used for receiving uplink data sent by user equipment on an unlicensed spectrum, and sending a downlink control signaling scrambled by a temporary identifier of a shared wireless network to the user equipment after receiving the uplink data, wherein the downlink control signaling comprises hybrid automatic repeat request feedback aiming at a plurality of user equipment.
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