CN115868135B

CN115868135B - Carrier switching method, device, equipment and storage medium

Info

Publication number: CN115868135B
Application number: CN202180002277.6A
Authority: CN
Inventors: 刘洋
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2025-01-28
Anticipated expiration: 2041-07-23
Also published as: CN115868135A; WO2023000338A1

Abstract

The application discloses a carrier switching method, a device, a terminal and a medium, and belongs to the technical field of communication. Triggering carrier switching of a physical uplink channel under the condition that HARQ feedback resources on a main carrier and an auxiliary carrier meet triggering conditions. The application provides a technical scheme capable of ensuring that HARQ-ACK feedback is sent in time under the condition that HARQ-ACK feedback resources of a main cell are unavailable.

Description

Carrier switching method, device, equipment and storage medium

Technical Field

The present application relates to the field of mobile communications, and in particular, to a carrier switching method, apparatus, device, and storage medium.

Background

The ultra-high reliability low-delay communication (Ultra Reliable and Low Latency Communication, URLLC) is one of three application scenarios of the 5th generation mobile communication system (the 5th Generation Mobile Communication,5G), and has the full characteristics of high reliability, low delay, extremely high availability and the like.

Under the URLLC problem, it is proposed to enhance HARQ-ACK feedback for Semi-persistent scheduling of physical downlink shared channel (Semi-PERSISTENT SCHEDULING PHYSICAL DOWNLINK SHARED CHANNEL, SPS PDSCH) transmissions. Typically, the HARQ-ACK feedback resource corresponding to the hybrid automatic repeat request acknowledgement (Hybrid Automatic Repeat request ACK, HARQ-ACK) may be obtained by the K1 indication. But when the HARQ-ACK feedback resource corresponding to the K1 is invalid, the feedback operation is discarded, retransmission is triggered, or the feedback operation is delayed according to a certain rule.

The above method has some effect on the reliability and delay of HARQ-ACK feedback.

Disclosure of Invention

The embodiment of the application provides a carrier switching method, a device, equipment and a storage medium, and provides a technical scheme capable of ensuring that HARQ-ACK feedback is sent in time under the condition that HARQ-ACK feedback resources of a main cell are unavailable.

According to an aspect of the embodiment of the present application, there is provided a carrier switching method, including:

and triggering carrier switching of the physical uplink channel under the condition that HARQ-ACK feedback resources on the main carrier and the auxiliary carrier meet the triggering condition.

According to another aspect of the embodiment of the present application, there is provided a carrier switching apparatus, including:

The carrier switching module is used for triggering carrier switching of the physical uplink channel under the condition that the triggering condition is met;

The triggering condition comprises triggering carrier switching of a physical uplink channel under the condition that HARQ-ACK feedback resources on a main carrier and an auxiliary carrier meet the triggering condition.

The technical scheme provided by the embodiment of the application has the following beneficial effects:

under the condition that the HARQ-ACK feedback resources on the main carrier and the auxiliary carrier meet the triggering conditions, for example, when the first HARQ-ACK feedback resource on the main cell is worse than the second HARQ-ACK feedback resource of the auxiliary cell, the carrier switching of the physical uplink channel is triggered, so that the problem of low delay feedback or accuracy caused by the fact that the first HARQ-ACK feedback resource on the main cell is worse can be avoided, the time delay of the HARQ-ACK feedback is reduced, and the timeliness of the HARQ-ACK feedback is ensured.

Drawings

FIG. 1 is a schematic diagram of a communication system shown in accordance with an exemplary embodiment;

fig. 2 is a flow chart illustrating a method of carrier switching according to an exemplary embodiment;

Fig. 3 is a flow chart illustrating a method of carrier switching according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a parameter configuration method according to an example embodiment;

Fig. 5 is a flow chart illustrating a method of carrier switching according to an exemplary embodiment;

fig. 6 is a flow chart illustrating a method of carrier switching according to an exemplary embodiment;

fig. 7 is a block diagram of a carrier switching device according to an exemplary embodiment;

fig. 8 is a schematic diagram of a network device according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.

Fig. l shows a schematic diagram of the architecture of a mobile communication system according to an exemplary embodiment of the present application. As shown in fig. 1, the system architecture may include a terminal 10 and an access network device 20.

The terminal 10 may refer to a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a wireless communication device, a User agent, or a User Equipment. Alternatively, the terminal device may also be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol ) phone, a WLL (Wireless Local Loop, wireless local loop) station, a PDA (Personal digital assistant) DIGITAL ASSISTANT, a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in 5GS or a terminal device in a future evolved PLMN (Public Land Mobile Network ), etc., which the embodiment of the present application is not limited to. The number of terminals 10 is typically plural and one or more terminals 10 may be distributed within the cell managed by each access network device 20.

The access network device 20 is a device deployed in the access network for providing wireless communication functionality for the terminal device 10. The access network device 20 may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. The names of access network device-capable devices may vary in systems employing different radio access technologies, such as in 5G NR systems, referred to as gNodeB or gNB. As communication technology evolves, the name "access network device" may change. For convenience of description, in the embodiment of the present application, the above-mentioned devices for providing the terminal device 10 with the wireless communication function are collectively referred to as access network devices. Alternatively, a communication relationship may be established between the terminal 10 and the core network device via the access network device 20. Illustratively, in a long term evolution (Long Term Evolution, LTE) system, the access network device 20 may be EUTRAN (Evolved Universal Terrestrial Radio Access Network, evolved universal terrestrial Radio network) or one or more enodebs in EUTRAN, and in a 5G NR (5G New Radio) system, the access network device 20 may be RAN (Radio Access Network ) or one or more gnbs in RAN.

In a carrier aggregation scenario, the same access network device 20 or a different access network device 20 is provided with a primary Cell (PRIMARY CELL, pcell) 22 and a Secondary Cell (Scell) 24. The terminal 10 communicates with the access network device 20 via a primary carrier corresponding to the primary cell 22 and a secondary carrier corresponding to the secondary cell 24. Wherein, the secondary carrier wave can be a plurality of.

In a downlink data transmission scenario, such as an SPS PDSCH transmission scenario. For the primary cell 22, the access network device 20 sends the downlink data bearer on PDSCH to the terminal 10, and the terminal 10 sends the HARQ-ACK feedback bearer on PUCCH to the access network device.

Illustratively, the transmission resources or time-frequency resources used to transmit or carry the HARQ-ACK feedback on the PUCCH of the primary cell 22 are referred to as first HARQ-ACK feedback resources.

Fig. 2 is a flowchart illustrating a carrier switching method according to an exemplary embodiment of the present application. This embodiment is illustrated with the method being performed by the terminal 10 or the access network device 20 shown in fig. l. The method comprises the following steps:

step 220, triggering carrier switching of the physical uplink channel under the condition that HARQ-ACK feedback resources on the main carrier and the auxiliary carrier meet the triggering condition.

The trigger condition is used to indicate that the first HARQ-ACK feedback resource on the primary cell is worse than the second HARQ-ACK feedback resource of the secondary cell. The trigger condition may be referred to as a trigger rule, a first condition, a first rule, a rule, etc., and the embodiment is not limited thereto.

The physical uplink channels include at least one of a physical uplink control channel (Physical Downlink Control Channel, PUCCH) and a physical uplink shared channel (Physical Downlink SHARED CHANNEL, PUSCH).

The carrier switching of the physical uplink channel may be referred to as uplink carrier switching and uplink channel carrier switching, for example, and the present embodiment is not limited thereto. Illustratively, the triggering condition includes any one of three conditions:

The first HARQ-ACK feedback resource on the primary carrier is not valid and there is a second HARQ-ACK feedback resource at the same time domain position on the secondary carrier;

Illustratively, the time domain position may be a unit of a symbol, a slot, a subframe, or the like. The present embodiment is illustrated with the time domain position being a symbol or slot.

The second HARQ-ACK feedback resource is earlier than the first HARQ-ACK feedback resource on the primary carrier;

illustratively, the second HARQ-ACK feedback resource is earlier than the first HARQ-ACK feedback resource, meaning that the time domain position of the second HARQ-ACK feedback resource is earlier than the time domain position of the first HARQ-ACK feedback resource.

The load of the first HARQ-ACK feedback resource on the primary carrier exceeds a first threshold and the load of the second HARQ-ACK feedback resource on the secondary carrier is below a second threshold.

In summary, in the method provided in this embodiment, when the HARQ-ACK feedback resources on the primary carrier and the secondary carrier meet the triggering condition, for example, when the first HARQ-ACK feedback resource on the primary cell is worse than the second HARQ-ACK feedback resource on the secondary cell, carrier switching of the physical uplink channel is triggered, which can avoid the problem of low delay feedback or accuracy caused by the worse first HARQ-ACK feedback resource on the primary cell, reduce the delay of HARQ-ACK feedback, and ensure the timeliness of HARQ-ACK feedback.

Fig. 3 shows a flowchart of an exemplary carrier switching method according to the present application. This embodiment is illustrated with the method being performed by the terminal 10 or the access network device 20 shown in fig. 1. The method comprises the following steps:

Step 302, determining a target auxiliary carrier in an activated state;

The terminal corresponds to one or more secondary carriers. Each secondary carrier may be in an active state, or in a dormant state.

Since the HARQ-ACK feedback resource on the secondary carrier in the dormant state is not valid, the target secondary carrier in the active state is determined first.

For example, the terminal corresponds to the secondary carrier 1, the secondary carrier 2 and the secondary carrier 3. And if the auxiliary carriers l and 2 are in a dormant state and the auxiliary carrier 3 is in an active state, determining the auxiliary carrier 3 as a target auxiliary carrier.

For another example, the terminal corresponds to the secondary carrier 1, the secondary carrier 2, the secondary carrier 3, and the secondary carrier 4. And if the auxiliary carriers 1 and2 are in a dormant state and the auxiliary carriers 3 and4 are in an active state, determining the auxiliary carriers 3 and4 as target auxiliary carriers.

For the auxiliary carrier in the dormant state, the auxiliary carrier in the dormant state can be activated first and converted into the auxiliary carrier in the activated state. For example, the access network device sends an activation indication to the terminal, where the activation indication is used to activate one or more secondary carriers in a dormant state.

Alternatively, step 320 is performed in case the first HARQ-ACK feedback resource on the primary carrier is not available or not available. Wherein the first HARQ-ACK feedback resource on the primary carrier is determined based on the K1 indication.

Illustratively, the access network device sends downlink control information (Downlink Control Information, abbreviated as DCI) to the terminal at the first time domain position t, and the terminal determines k0 and k1 according to the DCI. The terminal receives PDSCH at the second time domain position t+k0 and determines the first HARQ-ACK feedback resource on the primary carrier at the third time domain position t+k0+k1. Illustratively, k1 is carried in the PDSCH-to-harq_ feedback timing indicator field of the DCI.

Step 304, judging whether HARQ-ACK feedback resources on a main carrier and an auxiliary carrier meet triggering conditions;

The carrier switching of the physical uplink channel may be referred to as uplink carrier switching and uplink channel carrier switching, for example, and the present embodiment is not limited thereto.

Illustratively, the triggering condition includes any one of three conditions:

Illustratively, the time domain position may be in units of symbols, subframes, and the like. The present embodiment is illustrated with the time domain position being a symbol or symbols.

Step 306 is to determine whether the second HARQ-ACK feedback resource on the target secondary carrier is valid,

And judging whether the second HARQ-ACK feedback resource on the target auxiliary carrier is valid or not after judging whether the HARQ-ACK feedback resource on the main carrier and the auxiliary carrier meets the triggering condition and the condition that the first HARQ-ACK feedback resource on the main carrier is invalid and the second HARQ-ACK feedback resource exists at the same time domain position on the auxiliary carrier. If valid, step 308 is performed, and if invalid, step 310 is performed.

Optionally, under the condition that the target secondary carrier is an asymmetric spectrum, judging whether the second HARQ-ACK feedback resource on the asymmetric spectrum is valid according to the semi-static uplink and downlink frame structure configuration of the asymmetric spectrum.

Referring to fig. 4, the semi-static uplink and downlink frame structure configuration of the asymmetric spectrum includes a plurality of types, as exemplified by four types:

Illustratively, the first row includes 14 symbols in one slot, where 1 to 10 are downlink symbols, 11 to 12 are special symbols, 13 to 14 are uplink symbols, and the number of special slot symbols is configurable;

the second row of one time slot comprises 14 symbols, wherein the 1 st to 10 th are downlink symbols, the 11 th to 12 th are special symbols, the 13 th to 14 th are uplink symbols, and the number of the special time slot symbols is configurable;

One slot of the third row comprises 14 symbols, wherein, the 1 st to the 12 th are downlink symbols, the 13 th to the 14 th are special symbols, and the number of the special slot symbols is configurable;

one slot of the fourth row includes 14 symbols, where 1 to 6 are downlink symbols, 7 to 10 are special symbols, 11 to 14 are uplink symbols, and the number of special slot symbols is configurable.

In an exemplary case, the second HARQ-ACK feedback resource is determined to be valid in a case where the second HARQ-ACK feedback resource is in an uplink time unit. Or regarding an uplink time unit in the semi-static uplink and downlink frame structure configuration of the asymmetric frequency spectrum as an effective time unit, and determining that the second HARQ-ACK feedback resource is effective under the condition that the second HARQ-ACK feedback resource is in the effective time unit.

Illustratively, the uplink symbols in a special slot in a semi-static uplink-downlink frame structure configuration of the asymmetric spectrum are considered as effective time units.

In order to avoid the computational complexity caused by using the technical solution of the present embodiment in a complex scenario, in some implementation possibilities, the second HARQ-ACK feedback resource is determined to be invalid when multi-user multiplexing of the same HARQ-ACK codebook occurs on the target secondary carrier. The multi-user multiplexing of the same HARQ-ACK codebook refers to a scene that the current terminal and other terminals use the same HARQ-ACK codebook for feedback, and under the scene, the current resource is invalid and can continue to search for the available resource.

In some implementations, the second HARQ-ACK feedback resource is determined to be invalid in the event of a HARQ-ACK collision on the target secondary carrier. The HARQ-ACK collision refers to a scenario in which the current terminal collides with the HARQ-ACK feedback resources of other terminals, and in this scenario, the current resources are invalid and available resources can be continuously searched for.

Step 308, triggering carrier switching of the physical uplink channel in case that the triggering condition is satisfied and effective feedback resource exists in the HARQ-ACK on the secondary carrier,

And under the condition that the triggering condition is met, the terminal switches the PUCCH from the main carrier to the auxiliary carrier. And the terminal uses a second HARQ-ACK feedback resource on the auxiliary carrier to send or report the HARQ-ACK.

And step 310, executing a target strategy under the condition that the HARQ-ACK feedback resources on the main carrier and the auxiliary carrier do not meet the triggering condition.

In the event that the trigger condition is not satisfied, at least one of the following target policies is executed:

If the first HARQ-ACK feedback resource is valid, the first HARQ-ACK feedback resource is used for sending or reporting the HARQ-ACK feedback;

If the first HARQ-ACK feedback resource is invalid, the sending or reporting of the HARQ-ACK feedback is abandoned, or the access network equipment is triggered to retransmit the PDSCH at this time, or the sending or reporting of the HARQ-ACK feedback is delayed and fed back according to a certain rule. The certain rule may be a delay feedback rule already provided in the related art, and the rule of delay feedback is not limited in this embodiment.

The method provided by the embodiment also determines the effective second HARQ-ACK feedback resource on the target auxiliary carrier in the activated state, so that unnecessary calculation amount can be reduced under the condition that the terminal corresponds to a plurality of auxiliary carriers, and the calculation speed when determining whether the effective second HARQ-ACK feedback resource exists is improved.

According to the method provided by the embodiment, whether the effective second HARQ-ACK feedback resource exists or not is determined based on the effective time unit in the semi-static uplink and downlink frame structure configuration of the asymmetric frequency spectrum, unnecessary calculation amount can be reduced in a TDD transmission scene, and judgment on the ineffective time unit in the uplink and downlink frame structure configuration is not needed, so that the calculation speed when whether the effective second HARQ-ACK feedback resource exists or not is improved.

Fig. 5 shows a flowchart of a carrier switching method according to an exemplary embodiment of the present application. This embodiment is illustrated by the execution of the method by the terminal 10 and the access network device 20 shown in fig. 1. The method comprises the following steps:

step 402, the access network equipment sends downlink data to the terminal through PDSCH;

in a downlink data transmission scene, for a main cell, an access network device carries downlink data on a PDSCH and sends the downlink data to a terminal.

Illustratively, the access network device sends downlink control information (Downlink Contol Information, abbreviated as DCI) to the terminal at the first time domain position t, and the terminal determines k0 and k1 according to the DCI. The terminal receives PDSCH at the second time domain position t+k0 and determines the first HARQ-ACK feedback resource on the primary carrier at the third time domain position t+k0+k1. Illustratively, k1 is carried in the PDSCH-to-harq_ feedback timing indicator field of the DCI.

Step 404, judging whether HARQ-ACK feedback resources on a main carrier and an auxiliary carrier meet triggering conditions;

The physical uplink channels include at least one of a physical uplink control channel (Physical Downlink Contol Channel, PUCCH) and a physical uplink shared channel (Physical Downlink SHARED CHANNEL, PUSCH).

Step 406 is performed if the trigger condition is satisfied, and step 412 is performed if the trigger condition is not satisfied.

Illustratively, the triggering condition includes any one of three conditions:

Step 406, the access network equipment judges whether the second HARQ-ACK feedback resource on the target auxiliary carrier is valid or not;

And judging whether the second HARQ-ACK feedback resource on the target auxiliary carrier is valid or not after judging whether the HARQ-ACK feedback resource on the main carrier and the auxiliary carrier meets the triggering condition and the condition that the first HARQ-ACK feedback resource on the main carrier is invalid and the second HARQ-ACK feedback resource exists at the same time domain position on the auxiliary carrier. If valid, step 408 is performed, and if invalid, step 412 is performed.

Illustratively, the uplink time unit in a special slot in the semi-static uplink-downlink frame structure configuration of the asymmetric spectrum is regarded as the effective time unit.

In some implementations, the second HARQ-ACK feedback resource is determined to be invalid in the event of a HARQ-ACK collision on the target secondary carrier. The HARQ-ACK collision refers to a scenario in which the current terminal collides with the HARQ-ACK feedback of other terminals, and in this scenario, the current resource is invalid and the available resource can be continuously searched for.

Step 408, under the condition that the condition is met and the second HARQ-ACK feedback resource on the target auxiliary carrier is confirmed to be effective, sending a first downlink signaling to the terminal;

Illustratively, the first downlink signaling includes one or more combinations of:

Downlink control information (Downlink Control Information, DCI);

radio resource control (Radio Resource Control, RRC);

MAC control element (Medium Access Control Control Element, MAC CE).

Illustratively, the first downlink signaling carries at least one of the following information:

Cell identification corresponding to the auxiliary carrier;

PUCCH resource indication (Pucch Resource Indicator, PRI) PRI;

terminal identification (UE ID);

the number of HARQ-ACKs that need feedback;

And feeding back a codebook.

In one implementation possibility, the above information multiplexing is carried in the first downlink signaling of an existing version, which may be the first version specified in the communication protocol after R16. At this time, a first information field in a first downlink signaling of a first version is multiplexed to indicate carrier switching of a physical uplink channel;

In another implementation possibility, the above information is carried in a new version of the first downlink signaling, which may be the second version or the third version specified in R17 and the communication protocol after R17.

Schematically, a second information field in the second version of the first downlink signaling is used for indicating carrier switching of the physical uplink channel, and the second information field is a new information field relative to the first version of the first downlink signaling;

Illustratively, the second information bits in the third version of the first downlink signaling are used to indicate carrier switching of the physical uplink channel, and the second information bits are newly added information bits relative to the first version of the first downlink signaling.

Step 410, the terminal uses the second HARQ-ACK feedback resource on the auxiliary cell to carry out HARQ-ACK feedback according to the first downlink signaling;

And under the condition that the terminal receives the first downlink signaling, the terminal switches the PUCCH from the main carrier to the auxiliary carrier. And the terminal uses a second HARQ-ACK feedback resource on the auxiliary carrier to send or report the HARQ-ACK.

Step 412, executing the target strategy in case the HARQ-ACK feedback resources on the primary carrier and the secondary carrier do not meet the triggering condition.

The method provided by the embodiment further sends the downlink data through the access network equipment like the terminal, and the access network equipment determines whether the effective second HARQ-ACK feedback resource exists, so that the calculation time for determining whether the effective second HARQ-ACK feedback resource exists relative to the terminal under the condition that the terminal calculation power is not strong can be reduced, and the calculation efficiency for determining whether the effective second HARQ-ACK feedback resource exists is improved.

Fig. 6 shows a flowchart of a carrier switching method according to an exemplary embodiment of the present application. This embodiment is illustrated by the execution of the method by the terminal 10 and the access network device 20 shown in fig. 1. The method comprises the following steps:

Step 502, the access network device sends a second downlink signaling to the terminal, where the second downlink signaling is used to configure trigger conditions to the terminal:

Illustratively, the second downlink signaling is radio resource control (Radio Resource Control, RRC) RRC signaling.

Step 504, the access network equipment sends downlink PDSCH data to the terminal;

In a downlink data transmission scene, for a main cell, an access network device carries downlink data on a PDSCH channel and sends the downlink data to a terminal.

Step 506, the terminal judges whether the HARQ-ACK feedback resource on the main carrier and the auxiliary carrier meets the triggering condition;

Step 508 is performed if the trigger condition is satisfied, and step 512 is performed if the trigger condition is not satisfied.

Illustratively, the triggering condition includes any one of three conditions:

The first HARQ-ACK feedback resource on the primary carrier is inactive and there is a second HARQ-ACK feedback resource at the same time domain position on the secondary carrier;

Step 508, the terminal judges whether the second HARQ-ACK feedback resource on the target auxiliary carrier is valid;

And judging whether the second HARQ-ACK feedback resource on the target auxiliary carrier is valid or not after judging whether the HARQ-ACK feedback resource on the main carrier and the auxiliary carrier meets the triggering condition and the condition that the first HARQ-ACK feedback resource on the main carrier is invalid and the second HARQ-ACK feedback resource exists at the same time domain position on the auxiliary carrier. If valid, step 510 is performed, and if invalid, step 512 is performed.

Referring to fig. 4, the semi-static uplink and downlink frame structure configuration of the illustrative asymmetric spectrum includes a variety of, for example, four:

Step 510, under the condition that the condition is satisfied and the second HARQ-ACK feedback resource on the target auxiliary carrier is confirmed to be effective, carrying out HARQ-ACK feedback by using the second HARQ-ACK feedback resource on the auxiliary cell;

And step 512, executing the target strategy under the condition that the HARQ-ACK feedback resources on the main carrier and the auxiliary carrier do not meet the triggering condition.

In an alternative embodiment, the carrier switching of the physical uplink channel provided by the present application does not support out-of-order HARQ feedback based on any of the above method embodiments.

The HARQ-ACK feedback of the last downlink data transmission triggers the carrier switching of the physical uplink channel to be completed;

The HARQ-ACK feedback of the last downlink data transmission is completed on the secondary carrier corresponding to the secondary cell.

For example, if the PUCCH resources required for HARQ-ACK feedback for two subsequent PDSCH transmissions are all invalid on the primary carrier, assuming that the HARQ-ACK feedback for two subsequent PDSCH transmissions requires carrier switching for the physical uplink channel,

For the current HARQ-ACK feedback, after the last HARQ-ACK feedback triggers the carrier switching of the physical uplink channel to be executed, the carrier switching of the physical uplink channel can be triggered.

For the current HARQ-ACK feedback, the carrier switching of the current physical uplink channel can be performed after the last HARQ-ACK feedback transmission is completed.

According to the method provided by the embodiment, the out-of-order HARQ feedback is not existed in the carrier switching of the physical uplink channel provided by the confirmation, so that whether the HARQ-ACK feedback resource corresponds to the last HARQ-ACK feedback transmission or the current HARQ-ACK feedback transmission can be determined, the problem that the accuracy is not high when the first HARQ-ACK feedback resource on the main cell is poor can be avoided, and the accuracy of the HARQ-ACK feedback transmission is improved.

Fig. 7 is a block diagram of a carrier switching device according to an exemplary embodiment of the present application. The device comprises:

the carrier switching module 780 is configured to trigger carrier switching of the physical uplink channel when the trigger carrier switching condition is satisfied.

In an alternative design of the present application, the triggering condition includes that a first HARQ-ACK feedback resource of the primary carrier is invalid and a second HARQ-ACK feedback resource exists at the same time domain position of the secondary carrier, or that the second HARQ-ACK feedback resource is earlier than the first HARQ-ACK feedback resource on the primary carrier, or that a load of the first HARQ-ACK feedback resource on the primary carrier exceeds a first threshold and a load of the second HARQ-ACK feedback resource on the secondary carrier is lower than a second threshold.

In an alternative design of the present application, the apparatus further includes a determining module 720 configured to determine a target secondary carrier in an active state, and a determining module 740 configured to determine whether the second HARQ-ACK feedback resource on the target secondary carrier is valid.

In an optional design of the present application, the determining module 740 is configured according to the semi-static uplink and downlink frame structure configuration of the asymmetric spectrum, where the determining module 740 is configured to determine whether the second HARQ-ACK feedback resource on the asymmetric spectrum is valid.

In an alternative design of the present application, the determining module 720 is configured to consider an uplink symbol in a special slot in the semi-static uplink-downlink frame structure configuration of the asymmetric spectrum as an effective time unit.

In an optional design of the present application, the determining module 740 is configured to determine that the second HARQ-ACK feedback resource is invalid in a case where multi-user multiplexing of the same HARQ-ACK codebook occurs on the target secondary carrier, or determine that the second HARQ-ACK feedback resource is invalid in a case where HARQ-ACK collision occurs on the target secondary carrier.

In an optional design of the present application, the triggering condition further includes at least one condition that carrier switching of the physical uplink channel triggered by HARQ-ACK feedback of the last downlink data transmission has been completed, and that transmission of HARQ-ACK feedback of the last downlink data transmission on the secondary carrier has been completed.

In an alternative design of the present application, the triggering carrier switching of the physical uplink channel includes sending a first downlink signaling to the terminal, where the first downlink signaling is used to indicate carrier switching of the physical uplink channel.

In an alternative design of the present application, the first downlink signaling includes one or more of DCI, RRC, MAC CE.

In an alternative design of the present application, a first information field in the first downlink signaling of a first version is multiplexed to indicate carrier switching of the physical uplink channel, or a second information field in the first downlink signaling of a second version is used to indicate carrier switching of the physical uplink channel, and the second information field is a new information field with respect to the first downlink signaling of the first version, or a second information bit in the first downlink signaling of a third version is used to indicate carrier switching of the physical uplink channel, and the second information bit is a new information bit with respect to the first downlink signaling of the first version.

In an optional design of the present application, the first downlink signaling carries at least one of a cell identifier of the secondary carrier, a PRI, a UE ID, the number of HARQ-ACKs to be fed back, a PDSCH type, and a feedback codebook.

In an optional design of the present application, the receiving module 760 is configured to receive a second downlink signaling sent by the network device, where the second downlink signaling is used to configure the trigger condition, and the second downlink signaling is illustratively RRC signaling

In summary, in the method, when the first HARQ-ACK feedback resource on the primary cell is worse than the second HARQ-ACK feedback resource on the secondary cell, the carrier switching of the physical uplink channel is triggered based on the triggering condition, so that the problem of delay feedback or low accuracy is reduced, and the reliability and feedback efficiency of HARQ-ACK are ensured.

Fig. 8 shows a schematic structural diagram of a communication device (terminal or network device) according to an embodiment of the present application, which may be used to perform the above-mentioned carrier switching method, for example. In particular, the communication device 800 may include a processor 801, a receiver 802, a transmitter 803, a memory 804, and a bus 805.

The processor 801 includes one or more processing cores, and the processor 801 executes various functional applications and information processing by running software programs and modules.

The receiver 802 and the transmitter 803 may be implemented as one transceiver 806, which transceiver 806 may be a communication chip.

The memory 804 is connected to the processor 801 through a bus 805.

The memory 804 may be used for storing a computer program, and the processor 801 is configured to execute the computer program to implement the steps performed by the terminal or the network device (access network entity, core network element or core network entity) in the above-described method embodiments.

Wherein the transmitter 803 is adapted to perform the steps related to transmission in the respective method embodiments described above, the receiver 802 is adapted to perform the steps related to reception in the respective method embodiments described above, and the processor 801 is adapted to perform the steps other than the steps of transmission and reception in the respective embodiments described above.

Furthermore, the Memory 804 may be implemented by any type or combination of volatile or nonvolatile Memory devices including, but not limited to, RAM (Random-Access Memory) and ROM (Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory), flash Memory or other solid state Memory technology, CD-ROM (Compact Disc Read-Only Memory), DVD (Digital Video Disc, high density digital video disk) or other optical storage, tape cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices.

The embodiment of the application also provides a non-volatile computer readable storage medium, on which a computer program is stored, which when executed by a processor of a terminal, implements the carrier switching method described above.

The embodiment of the application also provides a chip, which comprises a programmable logic circuit and/or program instructions and is used for realizing the carrier switching method when the chip runs on terminal equipment.

Embodiments of the present application also provide a computer program product or a computer program, which comprises computer instructions stored in a computer readable storage medium, from which a processor of a terminal device reads and executes the computer instructions to implement the above-mentioned carrier switching method.

It should be understood that references herein to "a plurality" are to two or more. "and/or" describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate that there are three cases of a alone, a and B together, and B alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A carrier switching method, the method comprising:

Triggering carrier switching of a physical uplink channel under the condition that a hybrid automatic repeat request (HARQ-ACK) feedback resource on a main carrier and an auxiliary carrier meets a trigger condition and a second HARQ-ACK feedback resource on the auxiliary carrier is effective, wherein the trigger condition is used for indicating that a first HARQ-ACK feedback resource on the main carrier is worse than the second HARQ-ACK feedback resource on the auxiliary carrier;

the triggering conditions include:

the first HARQ-ACK feedback resource on the main carrier is invalid, and the second HARQ-ACK feedback resource exists at the same time domain position on the auxiliary carrier;

Or alternatively, the first and second heat exchangers may be,

The method further comprises the steps of:

determining a target auxiliary carrier in an activated state;

Under the condition that the target auxiliary carrier is an asymmetric frequency spectrum, judging whether a second HARQ-ACK feedback resource on the asymmetric frequency spectrum is effective or not according to semi-static uplink and downlink frame structure configuration of the asymmetric frequency spectrum;

and regarding the uplink symbol in the special time slot in the semi-static uplink and downlink frame structure configuration of the asymmetric frequency spectrum as an effective time unit.

2. The method of claim 1, wherein the trigger condition further comprises at least one of the following conditions:

the carrier switching of the PUCCH triggered by the HARQ-ACK feedback of the last downlink data transmission is completed before the next triggering can be performed;

and the HARQ-ACK feedback of the last downlink data transmission can be performed only after the transmission of the HARQ-ACK feedback of the last downlink data transmission on the auxiliary carrier is completed.

3. The method according to claim 1 or 2, characterized in that the method is performed by a base station;

The triggering carrier switching of the physical uplink channel includes:

and sending a first downlink signaling to the terminal, wherein the first downlink signaling is used for indicating carrier switching of the physical uplink channel.

4. A method according to claim 3, wherein the first downlink signaling comprises one or more combinations of:

Downlink control information DCI;

A radio resource control, RRC;

The medium access control unit MAC CE.

5. The method of claim 3, wherein the step of,

A first information field in the first downlink signaling of a first version multiplexed to indicate carrier switching of the physical uplink channel;

Or alternatively, the first and second heat exchangers may be,

A second information field in the first downlink signaling of a second version, configured to indicate carrier switching of the physical uplink channel, where the second information field is a new information field of the first downlink signaling relative to the first version;

Or alternatively, the first and second heat exchangers may be,

And a third version of second information bits in the first downlink signaling for indicating carrier switching of the physical uplink channel, wherein the second information bits are newly added information bits of the first downlink signaling relative to the first version.

6. A method according to claim 3, wherein the first downlink signaling carries at least one of the following information:

cell identification of the secondary carrier;

PUCCH resource indication PRI;

A terminal identity, UE ID;

the number of HARQ-ACKs that need feedback;

And feeding back a codebook.

7. The method according to claim 1 or 2, characterized in that the method is performed by a terminal, the method further comprising:

and receiving a second downlink signaling sent by the network equipment, wherein the second downlink signaling is used for configuring the trigger condition.

8. The method of claim 7, wherein the second downlink signaling is radio resource control, RRC, signaling.

9.A carrier switching apparatus, the apparatus comprising:

The carrier switching module is used for triggering carrier switching of a physical uplink channel under the condition that the HARQ feedback resources on the main carrier and the auxiliary carrier meet the triggering condition and the second HARQ-ACK feedback resources on the auxiliary carrier are effective, wherein the triggering condition is used for indicating that the first HARQ-ACK feedback resources on the main carrier are worse than the second HARQ-ACK feedback resources on the auxiliary carrier;

the triggering conditions include:

Or alternatively, the first and second heat exchangers may be,

the determining module is used for determining the target auxiliary carrier wave in an activated state;

The judging module is used for judging whether the second HARQ-ACK feedback resource on the asymmetric frequency spectrum is effective according to the semi-static uplink and downlink frame structure configuration of the asymmetric frequency spectrum under the condition that the target auxiliary carrier is the asymmetric frequency spectrum;

The judging module is further configured to treat an uplink symbol in a special slot in the semi-static uplink and downlink frame structure configuration of the asymmetric spectrum as an effective time unit.

10. The apparatus of claim 9, wherein the trigger condition further comprises at least one of:

The carrier switching of the PUCCH triggered by the HARQ-ACK feedback of the last downlink data transmission is completed, and the next triggering can be performed;

and after the transmission of the HARQ-ACK feedback of the last downlink data transmission on the auxiliary carrier wave is completed, the HARQ-ACK feedback of the next data transmission can be performed.

11. The device according to claim 9 or 10, wherein,

The carrier switching module is configured to send a first downlink signaling to a terminal, where the first downlink signaling is used to indicate carrier switching of the physical uplink channel.

12. The apparatus of claim 11, wherein the first downlink signaling comprises one or more combinations of:

Downlink control information DCI;

A radio resource control, RRC;

The medium access control unit MAC CE.

13. The apparatus of claim 11, wherein the device comprises a plurality of sensors,

Or alternatively, the first and second heat exchangers may be,

14. The apparatus of claim 11, wherein the first downlink signaling carries at least one of the following information:

cell identification of the secondary carrier;

PUCCH resource indication PRI;

A terminal identity, UE ID;

the number of HARQ-ACKs that need feedback;

And feeding back a codebook.

15. The apparatus according to claim 9 or 10, characterized in that the apparatus further comprises:

And the receiving module is used for receiving a second downlink signaling sent by the network equipment, and the second downlink signaling is used for configuring the triggering condition.

16. The apparatus of claim 15, wherein the second downlink signaling is radio resource control, RRC, signaling.

17. A communication device comprising a processor and a memory, the memory storing a computer program;

the processor is configured to execute the computer program in the memory to implement the carrier switching method of any one of the preceding claims 1 to 8.

18. A computer storage medium, characterized in that it has stored thereon a computer program for implementing the carrier switching method according to any of the preceding claims 1 to 8 when being executed by a processor.