CN107295664A - Feedback method and system for uplink transmission, base station and user equipment - Google Patents

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

technical field

The present invention relates to the field of communication technology, in particular to a feedback method and system for uplink transmission, a base station and user equipment.

Background technique

In an existing LTE (Long Term Evolution, long-term evolution) system, a base station schedules downlink data transmission and uplink data transmission through DCI (Downlink Control Information, downlink control signaling). For uplink data transmission, the base station sends a grant (Grant) for the UE to perform uplink data transmission through DCI format 0.

In FDD (Frequency Division Duplexing, Frequency Division Duplexing) LTE, the UE receives its own DCI 0 in subframe n, and knows the authorization for uplink transmission, and the UE performs the authorization on the designated resource in subframe n+4 according to the information in the authorization. data transmission. The base station analyzes the uplink data sent by the UE. If the uplink data can be received accurately, the base station indicates ACK on the PHICH (Physical Hybrid ARQ Indicator Channel, Physical HARQ Indicator Channel) of subframe n+8; if the uplink data cannot be received accurately or is not received If uplink data is received, the base station indicates NACK on the PHICH of subframe n+8.

In TDD (Time Division Duplexing, Time Division Duplex) LTE, UE receives its own DCI 0 in subframe n, UE performs data transmission in subframe n+k (k>=4), and UE transmits data in subframe n+k The PHICH is received on k+1 (1>=4).

Among them, the transmission of PHICH is organized in the form of PHICH group, multiple PHICH channels in one PHICH group occupy the same time-frequency domain physical resource, and adopt the multiplexing mode of orthogonal spread spectrum sequence. A PHICH channel is jointly determined by the identifier of the PHICH group and the identifier within the group. The UE determines the identity of the PHICH group through the position of the physical resource block occupied by the UE to transmit the uplink data (the index of the smallest physical resource block for the UE to transmit the uplink data in the first time slot) and the DMRS (Demodulation reference signal, demodulation reference signal) index and group identifiers.

Usually LTE is always deployed in the licensed spectrum owned by the operator, but the spectrum resources are very scarce, so the operator begins to consider making full use of the unlicensed spectrum. Before using the unlicensed spectrum, it is necessary to adopt the LBT (Listen Before Talk) mechanism , to monitor whether other users such as WLAN are using, if the channel is busy, you need to wait; if the channel is idle, you can use it for a period of time. When this use is completed, the spectrum needs to be released, and then re-monitor to obtain the right to use the spectrum next time.

When the uplink channel also uses unlicensed spectrum, the UE needs to use the LBT mechanism to know whether it can use the spectrum for uplink data transmission. Once the transmission is possible, the base station needs to send ACK/NACK to the UE so that the UE can know whether the transmission is successful. When the UE uses the unlicensed spectrum, it usually uses it jointly with the licensed spectrum to perform carrier aggregation. Therefore, the UE can receive PHICH on the PCell (primary cell, located in a certain authorized spectrum) on the licensed spectrum to know whether the UE's transmission on the uplink unlicensed spectrum is successful, and can also receive feedback on the unlicensed spectrum. Usually, when scheduling UEs to perform uplink transmission, the base station needs to check whether the PHICH resources of different UEs collide, and only when there is no conflict can the downlink control signaling (ie, DCI) be sent.

In the process of realizing the present invention, the inventor found that there are at least the following technical problems in the prior art:

When the UE uses the unlicensed spectrum for uplink transmission, the base station does not know when the UE will transmit on the unlicensed spectrum. If the existing mechanism is adopted, the PHICH group identity and group identity obtained by the UE on the PHICH may be Conflicts with other UE's PHICH group identifiers and intra-group identifiers, and the base station's HARQ (Hybrid Automatic Repeat Request, hybrid automatic repeat request) feedback resources for the UE may conflict with other UE's HARQ feedback resources, resulting in the base station being unable to accurately respond to the UE Feedback from transmissions on unlicensed spectrum.

Contents of the invention

The feedback method and system for uplink transmission, the base station and the user equipment provided by the present invention can accurately feed back the transmission of the user equipment on the unlicensed frequency 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 obtains the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indication channel;

The user equipment receives downlink control signaling or a physical HARQ indicator channel sent by the base station after receiving the uplink data, and the downlink control signaling or the physical HARQ indicator channel includes a hybrid automatic repeat request for at least one user equipment feedback;

According to the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel, the user equipment parses out the HARQ indicator channel for itself from the downlink control signaling or the physical HARQ indicator channel Hybrid automatic repeat request feedback.

Optionally, the downlink control signaling includes hybrid automatic repeat request feedback for multiple user equipments;

The user equipment obtaining the position of the HARQ feedback for itself in the downlink control signaling includes: the user equipment receiving radio resource control signaling sent by the base station, and the radio resource control signaling includes sharing The wireless network temporary identifier and the position of the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling;

The user equipment receiving the downlink control signaling sent by the base station after receiving the uplink data includes: the user equipment receiving the downlink control signaling sent by the base station after receiving the uplink data and scrambled by the shared wireless network temporary identity control signaling;

According to the position of the HARQ feedback for itself in the downlink control signaling, the user equipment parses out from the downlink control signaling that the HARQ feedback for itself includes: the The user equipment uses the shared wireless network temporary identifier to parse out the HARQ for itself from the downlink control signaling according to the position of the HARQ feedback for itself in the downlink control signaling Request feedback.

Optionally, the downlink control signaling includes HARQ feedback for a user equipment;

The user equipment acquiring the position of the HARQ feedback for itself in the downlink control signaling includes: the user equipment acquiring the HARQ feedback for a user equipment included in the downlink control signaling as HARQ feedback for itself;

The user equipment receiving the downlink control signaling sent by the base station after receiving the uplink data includes: the user equipment receiving the downlink control signaling sent by the base station after receiving the uplink data and scrambled by a dedicated wireless network temporary identifier. signaling;

According to the position of the HARQ feedback for itself in the downlink control signaling, the user equipment parses out from the downlink control signaling that the HARQ feedback for itself includes: the The user equipment analyzes the downlink control signaling by using the dedicated wireless network temporary identifier, and obtains HARQ feedback for itself.

Optionally, the user equipment acquiring the position of the HARQ feedback for itself in the downlink control signaling includes: the user equipment according to the identity of the user equipment or the user equipment's uplink transmission The minimum physical resource block index used is used to calculate the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling.

Optionally, the user equipment obtaining the position of the hybrid automatic repeat request feedback for itself in the physical HARQ indicator channel includes: the user equipment receiving radio resource control signaling sent by the base station, and the radio resource control signaling Including the location of the physical HARQ indicator channel resource reserved for the user equipment, where the location of the physical HARQ indicator channel resource includes a physical HARQ indicator channel group identifier and an intra-group identifier on the physical HARQ indicator channel;

According to the position of the HARQ feedback for itself in the physical HARQ indicator channel, the user equipment parses out the HARQ feedback for itself from the physical HARQ indicator channel, including: the The user equipment parses the HARQ indicator channel feedback for itself from the physical HARQ indicator channel according to the location of the reserved physical HARQ indicator channel resource.

In a second aspect, the present invention provides a user equipment, including:

a first sending unit, configured to send uplink data to the base station on an unlicensed frequency spectrum;

The obtaining unit is used to obtain the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel; the first receiving unit is used to receive the downlink control signal sent by the base station after receiving the uplink data. A signaling or physical HARQ indicator channel, where the downlink control signaling or physical HARQ indicator channel includes hybrid automatic repeat request feedback for at least one user equipment;

The parsing unit is configured to, according to the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel, parse out the HARQ feedback for .

Optionally, the downlink control signaling includes hybrid automatic repeat request feedback for multiple user equipments;

The obtaining unit is configured to receive the radio resource control signaling sent by the base station, the radio resource control signaling includes the shared radio network temporary identity and the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling position in the order;

The first receiving unit is configured to receive downlink control signaling sent by the base station after receiving the uplink data and scrambled by the shared wireless network temporary identifier;

The parsing unit is configured to use the shared wireless network temporary identifier to parse the downlink control signaling for itself according to the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling. HARQ feedback for .

Optionally, the downlink control signaling includes HARQ feedback for a user equipment;

The obtaining unit is configured to obtain the HARQ feedback for a user equipment included in the downlink control signaling as the HARQ feedback for itself;

The first receiving unit is configured to receive the downlink control signaling sent by the base station after receiving the uplink data and scrambled by the proprietary wireless network temporary identifier;

The parsing unit is configured to parse the downlink control signaling by using the private wireless network temporary identifier, and obtain HARQ feedback for itself.

Optionally, the obtaining unit is configured to calculate, according to the identity of the user equipment or the minimum physical resource block index used by the user equipment for uplink transmission, the hybrid automatic repeat request feedback for itself in the downlink control signal position in the order.

Optionally, the acquiring unit is configured to receive radio resource control signaling sent by the base station, where the radio resource control signaling includes the location of a physical HARQ indicator channel resource reserved for the user equipment, wherein the The location of the physical HARQ indicator channel resource includes the physical HARQ indicator channel group identifier and group identifier on the physical HARQ indicator channel;

The parsing unit is configured to parse out the hybrid automatic repeat request feedback for itself from the physical HARQ indicator channel according to the location of the reserved physical HARQ indicator channel resource.

In a third aspect, the present invention provides a base station, including:

The second receiving unit is configured to receive uplink data sent by the user equipment on an unlicensed spectrum;

The second sending unit is configured to send downlink control signaling or a physical HARQ indicator channel to the user equipment after the second receiving unit receives the uplink data, and the downlink control signaling or the physical HARQ indicator channel includes at least HARQ feedback for a user equipment.

Optionally, the downlink control signaling includes hybrid automatic repeat request feedback for multiple user equipments;

The base station also includes:

A third sending unit, configured to send radio resource control signaling to the user equipment, where the radio resource control signaling includes the shared radio network temporary identity and the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling position in the order;

The second sending unit is configured to send the downlink control signaling scrambled by the shared wireless network temporary identifier to the user equipment after the second receiving unit receives the uplink data.

Optionally, the downlink control signaling includes HARQ feedback for a user equipment;

The second sending unit is configured to send downlink control signaling scrambled with a dedicated wireless network temporary identifier to the user equipment after the second receiving unit receives the uplink data.

Optionally, the base station also includes:

A fourth sending unit, configured to send radio resource control signaling to the user equipment, where the radio resource control signaling includes the location of a physical HARQ indicator channel resource reserved for the user equipment, where the physical HARQ indicator channel The resource location includes a physical HARQ indicator channel group identifier and an intra-group identifier on the physical HARQ indicator channel.

In a fourth aspect, the present invention provides a feedback system for uplink transmission, including user equipment and a base station;

The user equipment is configured to send uplink data to the base station on the unlicensed frequency spectrum, and obtain the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel, and the receiving base station receives the uplink The downlink control signaling or the physical HARQ indicator channel sent after the data, the downlink control signaling or the physical HARQ indicator channel includes hybrid automatic repeat request feedback for at least one user equipment, according to the hybrid automatic repeat request for itself Requesting the position of the feedback in the downlink control signaling or the physical HARQ indicator channel, and parsing the hybrid automatic repeat request feedback for itself from the downlink control signaling or the physical HARQ indicator channel;

The base station is configured to receive uplink data sent by user equipment on an unlicensed spectrum, and send downlink control signaling or a physical HARQ indicator channel to the user equipment after receiving the uplink data, and the downlink control signaling or physical HARQ The indication channel includes HARQ feedback for at least one user equipment.

In the uplink transmission feedback method and system, base station and user equipment provided by the embodiments of the present invention, the user equipment sends uplink data to the base station on the unlicensed spectrum, and obtains HARQ feedback for itself in downlink control signaling or physical The position in the HARQ indicator channel, after receiving the uplink data, the base station sends downlink control signaling or physical HARQ indicator channel including hybrid automatic repeat request feedback for at least one user equipment to the user equipment, and the user equipment according to the The location of the own HARQ feedback in the downlink control signaling or the physical HARQ indicator channel, and parsing the own HARQ feedback from the downlink control signaling or the physical HARQ indicator channel. Compared with the prior art, the present invention can accurately feed back the transmission of the user equipment on the unlicensed frequency spectrum, and at the same time avoid interference to other user equipments to obtain hybrid automatic repeat request feedback.

Description of drawings

FIG. 1 is a flowchart of a feedback method for uplink transmission provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a user equipment provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a base station provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a base station provided by another embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a base station provided by another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a feedback system for uplink transmission provided by an embodiment of the present invention.

detailed description

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention provides a feedback method for uplink transmission, as shown in Figure 1, the method includes:

S11. The user equipment sends uplink data to the base station on the unlicensed frequency spectrum;

S12. The user equipment acquires the position of its own HARQ feedback in downlink control signaling or PHICH;

S13. The user equipment receives downlink control signaling or PHICH sent by the base station after receiving the uplink data, where the downlink control signaling or PHICH includes HARQ feedback for at least one user equipment;

S14. The user equipment parses the 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.

In the feedback method for uplink transmission provided by the embodiment of the present invention, the user equipment sends uplink data to the base station on the unlicensed spectrum, obtains the position of the HARQ feedback for itself in the downlink control signaling or PHICH, and the base station receives the uplink data. , sending downlink control signaling or PHICH including HARQ feedback for at least one user equipment to the user equipment, the user equipment according to the position of the HARQ feedback for itself in the downlink control signaling or PHICH, from the downlink control The HARQ feedback for itself is parsed from the signaling or the PHICH. Compared with the prior art, the present invention can accurately feed back the transmission of the user equipment on the unlicensed frequency spectrum, and at the same time avoid interference to other user equipments in acquiring HARQ feedback.

Wherein, the aforementioned 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 user equipment receives RRC (Radio Resource Control, radio resource control) signaling sent by the base station, and the RRC signaling includes a shared RNTI (Radio Network Temporary Identity, radio network temporary identity) and HARQ feedback for the user equipment (that is, the position of the HARQ feedback of the uplink data transmitted by the user equipment) in the downlink control signaling, so as to obtain the position of the HARQ feedback for itself in the downlink control signaling;

The user equipment receives the downlink control signaling scrambled by the shared RNTI sent by the base station after receiving the uplink data;

Then, according to the position of the HARQ feedback for itself in the downlink control signaling, the user equipment uses the shared RNTI to resolve the HARQ feedback for itself from the downlink control signaling.

Among them, the UE supports unlicensed frequency and licensed frequency for carrier aggregation, and supports LBT, so as to obtain the right to use the unlicensed frequency for a period of time. The continuous use time set by different countries on unlicensed frequencies is not exactly the same. For example, in Japan, the continuous use time on unlicensed frequencies is 4ms, and in other countries it can be 8ms or 10ms.

The UE accesses the network through the authorized frequency F1 and establishes an RRC connection. Due to business requirements, the serving base station configures an unlicensed frequency for the UE, so that the UE can use the unlicensed frequency for uplink data transmission.

The UE needs to pass LBT, and when the UE detects that the unlicensed frequency is idle (the detected signal strength is lower than a predetermined threshold, which can be configured by the base station), it can transmit on the unlicensed frequency. Since the time for UE to obtain uplink transmission is limited, it is assumed that the scheduling decision of uplink transmission is still made by the base station and sent to UE. When UE can perform uplink transmission according to the decision of uplink scheduling depends on the result of LBT.

Specifically, when the UE performs data transmission in subframe n on the unlicensed spectrum, the UE will pass PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel, Physical Downlink Control Channel) in subframe n+k (k=4, FDD; K>=4, TDD) downlink control channel) to receive HARQ feedback. At this time, if the base station sends HARQ feedback to the UE on the licensed spectrum, the UE receives the HARQ feedback at subframe n+k according to the above timing relationship; if the base station sends HARQ feedback to the UE on the unlicensed spectrum, the UE Subframes n+k or later receive HARQ feedback, because the base station needs to perform LBT to obtain the right to use the unlicensed spectrum, and the UE can know whether to obtain HARQ feedback from the licensed spectrum or the unlicensed spectrum through the configuration of the base station. After receiving the uplink data sent by the UE, the base station needs to feed back ACK if it can be decoded correctly; if it cannot be decoded successfully, it needs to feed back NACK.

If the downlink control signaling can include feedback for uplink transmission of four UEs, the feedback for uplink transmission of each UE occupies different bits. For example: the downlink control signaling contains 20 bits, and every 5 bits is used to indicate the HARQ feedback of a UE. The base station can indicate to each UE the position of the HARQ feedback of the UE in the downlink control signaling through RRC signaling, and indicate the Shared RNTI. The base station indicates to the UE the position of the UE's HARQ feedback in the downlink control signaling 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 notifies the UE before receiving the HARQ feedback UE will do. Wherein, the base station may send the downlink control signaling including the HARQ feedback on the serving cell located on the licensed spectrum; or send the downlink control signaling including the HARQ feedback to the UE on the serving cell on the unlicensed spectrum. The serving cells that send the HARQ feedback are the serving cells configured by the base station for the UE.

Optionally, the downlink control signaling may only include HARQ feedback for one user equipment;

The user equipment obtains the HARQ feedback for a user equipment included in the downlink control signaling as the HARQ feedback for itself, so as to obtain the position of the HARQ feedback for itself in the downlink control signaling, the downlink control signal The information element at a specific position in the command is used to indicate HARQ feedback, for example, 1 bit is used to indicate ACK/NACK at a certain position;

The user equipment receives the downlink control signaling scrambled by the dedicated RNTI sent by the base station after receiving the uplink data; wherein the dedicated RNTI is the dedicated RNTI allocated by the base station when each UE accesses a cell. RNTI, such as Cell RNTI;

The user equipment uses the dedicated RNTI to analyze the downlink control signaling to obtain HARQ feedback for itself.

Since the downlink control signaling only includes the HARQ feedback for the user equipment, when the UE receives the downlink control signaling sent by the base station, it can directly use the dedicated RNTI to parse the downlink control signaling from the downlink control signaling. The HARQ feedback for itself.

Optionally, the user equipment obtaining the position of the HARQ feedback for itself in the downlink control signaling includes: the user equipment according to the identity of the user equipment or the minimum physical location used by the user equipment for uplink transmission The resource block index calculates the position of its own HARQ feedback in the downlink control signaling. When the base station uses the shared RNTI scrambled downlink control signaling to indicate HARQ feedback, the UE needs to determine the position of its own HARQ feedback in the downlink control signaling. At this time, the identity of the user equipment or the user equipment uplink transmission The minimum physical resource block index used when calculating the position of the HARQ feedback for itself in the downlink control signaling.

Specifically, calculating the position of the HARQ feedback for itself in the downlink control signaling according to the identity of the user equipment may be: UE_ID mod 4; calculating according to the minimum physical resource block index used by the user equipment for uplink transmission The position of the HARQ feedback for itself in the downlink control signaling may be: PRB index mod 4.

At this time, the base station can determine which UE sent the uplink data according to the UE-specific DMRS contained in the received uplink data sent by the UE, and then send HARQ feedback to the UE at the corresponding position in the DCI according to the received result (ACK or NACK).

Optionally, the user equipment acquiring the position of the HARQ feedback for itself in the PHICH includes: the user equipment receiving RRC signaling sent by the base station, the RRC signaling including the PHICH resources reserved for the user equipment The location of the PHICH resource, wherein the location of the PHICH resource includes a PHICH group identifier and an intragroup identifier on the PHICH;

The user equipment, according to the position of the HARQ feedback for itself in the PHICH, resolving the HARQ feedback for itself from the PHICH includes: the user equipment, according to the position of the reserved PHICH resource, from the The PHICH parses out the HARQ feedback directed at itself. The base station indicates to the UE the location of the UE's HARQ feedback in the PHICH before step S11 when the user equipment sends uplink data to the base station on the unlicensed spectrum, or in parallel with step S11, it is only necessary to ensure that the UE notifies the UE before receiving the HARQ feedback .

Specifically, when selecting a certain UE to use an unlicensed frequency for uplink transmission, the base station pre-reserves a certain resource in the PHICH for the UE's HARQ feedback, for example, it is located in the fourth PHICH group, and the group ID is 2 The PHICH resource is used for feedback of the UE transmitting data on an unlicensed frequency. The base station indicates to the UE the PHICH resource located in the 4th PHICH group and marked as 2 in the group through signaling, so that the UE receives HARQ feedback at a designated position after transmitting uplink data. After the base station reserves the PHICH resources of (4, 2), when scheduling other UEs for uplink transmission (the minimum PRB allocated for uplink transmission), it needs to avoid that the PHICH resources calculated by other UEs according to the existing mechanism are (4, 2).

Wherein, the base station may reserve the HARQ feedback resource for uplink transmission of the UE on the unlicensed frequency on the PHICH located in the serving cell of the licensed spectrum or the serving cell of the unlicensed spectrum.

It should be noted that if the UE receives an authorization to transmit on the unlicensed spectrum in subframe n, after the UE performs LBT, if the UE can perform uplink transmission in subframe n+4, the UE obtains the PHICH group according to the following algorithm ID and intra-group ID, and according to the PHICH group ID and intra-group ID to obtain its corresponding ACK/NACK in PHICH; 4, n+5, n+6) for uplink transmission, the UE obtains its corresponding ACK/NACK on the specified PHICH according to the following algorithm. Here, the period of time may be preset by the protocol or set by the base station through signaling.

If the UE cannot perform uplink transmission in subframe n+4 or a period of time starting from subframe n+4, that is, the result of UE performing LBT does not allow the UE to perform uplink transmission in subframe 4 or a period of time after that, the UE here When the uplink transmission can be performed later, the UE needs to obtain the feedback of the uplink transmission according to the method provided in the foregoing embodiment.

Specifically, the transmission of the PHICH is organized in the form of a PHICH group, and multiple PHICH channels in one PHICH group occupy the same time-frequency domain physical resource, and the multiplexing method of orthogonal spread spectrum sequences is adopted. For example, in a normal CP (Cyclic Prefix, cyclic prefix), one PHICH group multiplexes 8 PHICH channels, that is, it can indicate ACK/NACK of its uplink transmission to 8 UEs (assuming that one UE only transmits one transport block). A PHICH channel consists of PHICH group identification and group identification decided together. The UE determines the identity of the PHICH group through the position of the physical resource block occupied by the UE to transmit the uplink data (the index of the smallest physical resource block for the UE to transmit the uplink data in the first time slot) and the DMRS (Demodulation Reference Signal, demodulation reference signal) index and group identifiers. Specifically as the following two formulas:

Among them, I _lowest is the minimum PRB index used by the UE for uplink transmission in the first time slot, n _DMRS is the cyclic shift (Cyclic Shift) of the DMRS used by the UE, and the last item of formula (1) represents the PHICH group Number, the last item of formula (2) represents the size of the spreading factor when PHICH is modulated.

The embodiment of the present invention also provides a user equipment. As shown in FIG. 2, the user equipment includes:

The first sending unit 21 is configured to send uplink data to the base station on the unlicensed frequency spectrum;

The acquiring unit 22 is configured to acquire the position of the HARQ feedback for itself in the downlink control signaling or PHICH; the first receiving unit 23 is configured to receive the downlink control signaling or PHICH sent by the base station after receiving the uplink data, The downlink control signaling or PHICH includes HARQ feedback for at least one user equipment;

The parsing unit 24 is configured to parse out the 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 user equipment provided by the embodiment of the present invention sends uplink data to the base station on the unlicensed spectrum, and obtains the position of the HARQ feedback for itself in the downlink control signaling or PHICH, and receives the uplink data sent by the base station after receiving the uplink data. The downlink control signaling or PHICH including the HARQ feedback for at least one user equipment, according to the position of the HARQ feedback for itself in the downlink control signaling or PHICH, parse from the downlink control signaling or PHICH output HARQ feedback for itself. Compared with the prior art, the present invention can accurately feed back the transmission of the user equipment on the unlicensed frequency spectrum, and at the same time avoid interference to other user equipments in acquiring HARQ feedback.

Optionally, the downlink control signaling includes HARQ feedback for multiple user equipments;

The obtaining unit 22 is configured to receive RRC signaling sent by the base station, where the RRC signaling includes the shared RNTI and the position of the HARQ feedback for the user equipment in the downlink control signaling;

The first receiving unit 23 is configured to receive downlink control signaling scrambled by the shared RNTI sent by the base station after receiving the uplink data;

The analysis unit 24 is configured to use the shared RNTI to analyze 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.

Optionally, the downlink control signaling includes HARQ feedback for a user equipment;

The obtaining unit 22 is configured to obtain the HARQ feedback for a user equipment included in the downlink control signaling as the HARQ feedback for itself;

The first receiving unit 23 is configured to receive downlink control signaling scrambled by a dedicated RNTI sent by the base station after receiving the uplink data;

The parsing unit 24 is configured to use the dedicated RNTI to parse the downlink control signaling to obtain HARQ feedback for itself.

Optionally, the obtaining unit 22 is configured to calculate the HARQ feedback for itself in the downlink control signaling according to the identity of the user equipment or the minimum physical resource block index used by the user equipment for uplink transmission Location.

Optionally, the acquiring unit 22 is configured to receive RRC signaling sent by the 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 The PHICH group logo and intra-group logo on the website;

The parsing unit 24 is configured to parse out the HARQ feedback for itself from the PHICH according to the position of the reserved PHICH resource.

The embodiment of the present invention also provides a base station. As shown in FIG. 3, the base station includes:

The second receiving unit 31 is configured to receive uplink data sent by the user equipment on an unlicensed spectrum;

The second sending unit 32 is configured to send downlink control signaling or PHICH to the user equipment after the second receiving unit receives the uplink data, and the downlink control signaling or PHICH includes HARQ for at least one user equipment feedback.

The base station provided by the embodiment of the present invention, after receiving the uplink data sent by the user equipment on the unlicensed spectrum, sends the downlink control signaling or PHICH including HARQ feedback for at least one user equipment to the user equipment, so that the user equipment according to The position of the HARQ feedback for itself in the downlink control signaling or the PHICH is analyzed from the downlink control signaling or the PHICH for the HARQ feedback for itself. Compared with the prior art, the present invention can accurately feed back the transmission of the user equipment on the unlicensed frequency spectrum, and at the same time avoid interference to other user equipments in acquiring HARQ feedback.

Optionally, the downlink control signaling includes HARQ feedback for multiple user equipments.

As shown in Figure 4, the base station also includes:

The third sending unit 33 is configured to send RRC signaling to the user equipment, where the RRC signaling includes the shared RNTI and the position of the HARQ feedback for the user equipment in the downlink control signaling;

The second sending unit 32 is configured to send the downlink control signaling scrambled by the shared RNTI to the user equipment after the second receiving unit 31 receives the uplink data.

Optionally, the downlink control signaling includes HARQ feedback for a user equipment;

The second sending unit 32 is configured to send downlink control signaling scrambled with a dedicated RNTI to the user equipment after the second receiving unit 31 receives the uplink data.

Optionally, as shown in Figure 5, the base station further includes:

The fourth sending unit 34 is configured to send RRC signaling to the user equipment, where the RRC signaling includes the location of the PHICH resource reserved for the user equipment, where the location of the PHICH resource includes a PHICH group on the PHICH ID and group ID.

The embodiment of the present invention also provides a feedback system for uplink transmission, as shown in FIG. 6 , 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 the unlicensed spectrum, obtain the position of the HARQ feedback for itself in the downlink control signaling or PHICH, and receive the information sent by the base station 62 after receiving the uplink data Downlink control signaling or PHICH, the downlink control signaling or PHICH includes HARQ feedback for at least one user equipment, according to the position of the HARQ feedback for itself in the downlink control signaling or PHICH, from the Analyze the HARQ feedback for itself from the downlink control signaling or PHICH;

The base station 62 is configured to receive uplink data sent by the user equipment 61 on the unlicensed spectrum, and send downlink control signaling or PHICH to the user equipment 61 after receiving the uplink data, and the downlink control signaling or PHICH HARQ feedback for at least one user equipment is included.

In the feedback system for uplink transmission provided by the embodiment of the present invention, the user equipment sends uplink data to the base station on the unlicensed spectrum, and obtains the position of the HARQ feedback for itself in the downlink control signaling or PHICH, and the base station receives the uplink data After that, send downlink control signaling or PHICH including HARQ feedback for at least one user equipment to the user equipment, and the user equipment according to the position of the HARQ feedback for itself in the downlink control signaling or PHICH, from the downlink The HARQ feedback for itself is analyzed from the control signaling or the PHICH. Compared with the prior art, the present invention can accurately feed back the transmission of the user equipment on the unlicensed frequency spectrum, and at the same time avoid interference to other user equipments in acquiring HARQ feedback.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (15)

1. A feedback method for uplink transmission, characterized in that, comprising: The user equipment sends uplink data to the base station on the unlicensed spectrum; The user equipment obtains the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indication channel; The user equipment receives downlink control signaling or a physical HARQ indicator channel sent by the base station after receiving the uplink data, and the downlink control signaling or the physical HARQ indicator channel includes a hybrid automatic repeat request for at least one user equipment feedback; According to the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel, the user equipment parses out the HARQ indicator channel for itself from the downlink control signaling or the physical HARQ indicator channel Hybrid automatic repeat request feedback. 2. The method according to claim 1, wherein the downlink control signaling includes HARQ feedback for multiple user equipments; The user equipment obtaining the position of the HARQ feedback for itself in the downlink control signaling includes: the user equipment receiving radio resource control signaling sent by the base station, and the radio resource control signaling includes sharing The wireless network temporary identifier and the position of the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling; The user equipment receiving the downlink control signaling sent by the base station after receiving the uplink data includes: the user equipment receiving the downlink control signaling sent by the base station after receiving the uplink data and scrambled by the shared wireless network temporary identity control signaling; According to the position of the HARQ feedback for itself in the downlink control signaling, the user equipment parses out from the downlink control signaling that the HARQ feedback for itself includes: the The user equipment uses the shared wireless network temporary identifier to parse out the HARQ for itself from the downlink control signaling according to the position of the HARQ feedback for itself in the downlink control signaling Request feedback. 3. The method according to claim 1, wherein the downlink control signaling includes HARQ feedback for a user equipment; The user equipment acquiring the position of the HARQ feedback for itself in the downlink control signaling includes: the user equipment acquiring the HARQ feedback for a user equipment included in the downlink control signaling as HARQ feedback for itself; The user equipment receiving the downlink control signaling sent by the base station after receiving the uplink data includes: the user equipment receiving the downlink control signaling sent by the base station after receiving the uplink data and scrambled by a dedicated wireless network temporary identifier. signaling; According to the position of the HARQ feedback for itself in the downlink control signaling, the user equipment parses out from the downlink control signaling that the HARQ feedback for itself includes: the The user equipment analyzes the downlink control signaling by using the dedicated wireless network temporary identifier, and obtains HARQ feedback for itself. 4. The method according to claim 1, wherein the acquiring the position of the user equipment in the downlink control signaling for its HARQ feedback comprises: the user equipment according to the user equipment or the minimum physical resource block index used by the user equipment for uplink transmission to calculate a position in the downlink control signaling for its HARQ feedback. 5. The method according to claim 1, wherein the user equipment obtaining the position of the hybrid automatic repeat request feedback for itself in the physical HARQ indicator channel comprises: the user equipment receiving the radio resource control signal sent by the base station signaling, the radio resource control signaling includes the location of the physical HARQ indicator channel resource reserved for the user equipment, where the location of the physical HARQ indicator channel resource includes a physical HARQ indicator channel on the physical HARQ indicator channel Group ID and intra-group ID; The user equipment responds in the physical The location in the HARQ indicator channel, parsing the hybrid automatic repeat request feedback for itself from the physical HARQ indicator channel includes: the user equipment according to the reserved physical HARQ indicator channel resource location, from the physical The HARQ indicator channel parses out the hybrid automatic repeat request feedback for itself. 6. A user equipment, characterized in that, comprising: The first sending unit is configured to send uplink data to the base station on the unlicensed frequency spectrum; The obtaining unit is used to obtain the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel; the first receiving unit is used to receive the downlink control signal sent by the base station after receiving the uplink data. A signaling or physical HARQ indicator channel, where the downlink control signaling or physical HARQ indicator channel includes hybrid automatic repeat request feedback for at least one user equipment; The parsing unit is configured to, according to the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel, parse out the HARQ feedback for . 7. The user equipment according to claim 6, wherein the downlink control signaling includes hybrid automatic repeat request feedback for multiple user equipments; The obtaining unit is configured to receive the radio resource control signaling sent by the base station, the radio resource control signaling includes the shared radio network temporary identity and the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling position in the order; The first receiving unit is configured to receive downlink control signaling sent by the base station after receiving the uplink data and scrambled by the shared wireless network temporary identifier; The parsing unit is configured to use the shared wireless network temporary identifier to parse the downlink control signaling for itself according to the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling. HARQ feedback for . 8. The user equipment according to claim 6, wherein the downlink control signaling includes HARQ feedback for one user equipment; The obtaining unit is configured to obtain the HARQ feedback for a user equipment included in the downlink control signaling as the HARQ feedback for itself; The first receiving unit is configured to receive the downlink control signaling sent by the base station after receiving the uplink data and scrambled by the proprietary wireless network temporary identifier; The parsing unit is configured to parse the downlink control signaling by using the private wireless network temporary identifier, and obtain HARQ feedback for itself. 9. The user equipment according to claim 6, wherein the obtaining unit is configured to calculate the user equipment's own resource block index according to the identifier of the user equipment or the minimum physical resource block index used by the user equipment for uplink transmission. The position of HARQ feedback in the downlink control signaling. 10. The user equipment according to claim 6, wherein the acquiring unit is configured to receive the radio resource control signaling sent by the base station, the radio resource control signaling includes the reserved information for the user equipment The location of the physical HARQ indicator channel resource, wherein the location of the physical HARQ indicator channel resource includes a physical HARQ indicator channel group identifier and an intra-group identifier on the physical HARQ indicator channel; The parsing unit is configured to parse out the hybrid automatic repeat request feedback for itself from the physical HARQ indicator channel according to the location of the reserved physical HARQ indicator channel resource. 11. A base station, characterized in that it comprises: The second receiving unit is configured to receive uplink data sent by the user equipment on an unlicensed spectrum; The second sending unit is configured to send downlink control signaling or a physical HARQ indicator channel to the user equipment after the second receiving unit receives the uplink data, and the downlink control signaling or physical The HARQ indicator channel includes hybrid automatic repeat request feedback for at least one user equipment. 12. The base station according to claim 11, wherein the downlink control signaling includes hybrid automatic repeat request feedback for multiple user equipments; The base station also includes: A third sending unit, configured to send radio resource control signaling to the user equipment, where the radio resource control signaling includes the shared radio network temporary identity and the hybrid automatic repeat request feedback for the user equipment in the downlink control signaling position in the order; The second sending unit is configured to send the downlink control signaling scrambled by the shared wireless network temporary identifier to the user equipment after the second receiving unit receives the uplink data. 13. The base station according to claim 11, wherein the downlink control signaling includes HARQ feedback for one user equipment; The second sending unit is configured to send downlink control signaling scrambled with a dedicated wireless network temporary identifier to the user equipment after the second receiving unit receives the uplink data. 14. The base station according to claim 11, further comprising: A fourth sending unit, configured to send radio resource control signaling to the user equipment, where the radio resource control signaling includes the location of a physical HARQ indicator channel resource reserved for the user equipment, where the physical HARQ indicator channel The resource location includes a physical HARQ indicator channel group identifier and an intra-group identifier on the physical HARQ indicator channel. 15. A feedback system for uplink transmission, comprising user equipment and a base station; The user equipment is configured to send uplink data to the base station on the unlicensed frequency spectrum, and obtain the position of the hybrid automatic repeat request feedback for itself in the downlink control signaling or the physical HARQ indicator channel, and the receiving base station receives the uplink The downlink control signaling or the physical HARQ indicator channel sent after the data, the downlink control signaling or the physical HARQ indicator channel includes hybrid automatic repeat request feedback for at least one user equipment, according to the hybrid automatic repeat request for itself Requesting the position of the feedback in the downlink control signaling or the physical HARQ indicator channel, and parsing the hybrid automatic repeat request feedback for itself from the downlink control signaling or the physical HARQ indicator channel; The base station is configured to receive uplink data sent by user equipment on an unlicensed spectrum, and send downlink control signaling or a physical HARQ indicator channel to the user equipment after receiving the uplink data, and the downlink control signaling or physical HARQ The indication channel includes HARQ feedback for at least one user equipment.