Electronic equipment and method for user equipment, electronic equipment and method for base station

Abstract

The present disclosure relates to a method, a base station and a user equipment for wireless communication in a wireless communication system. An electronic device for a user equipment includes: a processor and a memory, the processor is configured to execute computer instructions stored in the memory to execute: directly communicating with a base station on a primary component carrier and on at least one secondary component carrier; based on configuration information from the base station, in addition to configuring PUCCH on the primary component carrier, configuring PUCCH on a secondary component carrier in at least one secondary component carrier; and in response to downlink transmission, transmitting HARQ feedback on the PUCCH of the secondary component carrier, the processor is configured to obtain configuration information from a radio resource control signaling from the base station, select a secondary component carrier according to an uplink transmission load on at least one secondary component carrier, and the processor is configured to: transmit HARQ feedback corresponding to PDSCH transmission according to the feedback timing dynamically indicated by the DCI signaling of the PDSCH scheduling of the overlapping downlink subframe.

Description

[0001] This application is a divisional application of the Chinese patent application filed on January 28, 2014, with application number 201410042432.9 and invention name “Method, base station and user equipment for wireless communication in a wireless communication system”. Technical Field

[0002] The present disclosure relates to the technical field of wireless communications, and in particular to a method, a base station, and a UE (User Equipment) for performing wireless communications in a wireless communication system. Background Art

[0003] This section provides background information related to the present disclosure which is not necessarily prior art.

[0004] In the scenario of carrier aggregation within a traditional base station, PUCCH (Physical Uplink Control Channel) can only be transmitted on the uplink main carrier, PUSCH (Physical Uplink Shared Channel) and SRS (Sounding Reference Signal) can be transmitted on SCC (Secondary Component Carrier), and PRACH (Physical Random Access Channel) signals are only transmitted when the terminal wants to access a certain carrier.

[0005] LTE (Long Term Evolution) Rel-12 and later versions will support the following three basic types of carrier aggregation: 1) FDD (Frequency Division Duplexing) carrier aggregation or TDD (Time Division Duplexing) carrier aggregation with the same frequency band configuration; 2) TDD carrier aggregation with different uplink and downlink configurations; and 3) carrier aggregation between FDD and TDD.

[0006] In particular, when a large number of small base stations are deployed and there is a direct optical fiber connection between the small base stations and the macro base stations, the traditional practice of only the main carrier being able to transmit PUCCH will have the following problems for the above three scenarios: 1) It cannot help the macro base station node to perform PUCCH offload and reduce the burden on the macro cell uplink control channel, especially when the main carrier has fewer uplink time slots and the main carrier and the auxiliary carrier HARQ (Hybrid Automatic Repeat Request) RTT (Round-Trip Time) are different (such as FDD with TDD but TDD as the main carrier, or TDD with different configurations. It is worth noting that the TDD uplink subframe can only account for up to 60% of all subframes); 2) When the main carrier is a macro cell carrier, the uplink transmission energy consumption is too high; and 3) When the main carrier is a TDD carrier and the number of uplink subframes is small, it is easy to cause a higher PUCCH feedback delay and downlink data retransmission delay, thereby affecting the user QoS (Quality of Service) experience. Summary of the invention

[0007] This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

[0008] The purpose of the present disclosure is to provide a method, a base station and a user equipment for wireless communication in a wireless communication system, which can flexibly adjust the transmission carrier of the uplink signal, especially the PUCCH, thereby optimizing the transmission performance of the uplink signal and improving the efficiency of downlink data transmission.

[0009] According to one aspect of the present disclosure, a method for performing wireless communications in a wireless communication system is provided, the wireless communication system comprising a base station and a user equipment, the user equipment communicating with the base station via multiple component carriers in a carrier aggregation manner, the method comprising: assigning a priority to each component carrier by the base station based on at least one of the following rules so that the user equipment selects a component carrier with the highest priority on overlapping uplink subframes to transmit an uplink signal: an expected power loss for transmitting the uplink signal on the component carrier; a burden for transmitting the uplink signal on the component carrier; a number of uplink subframes of the component carrier; and a primary and secondary attribute of a component carrier for transmitting a downlink signal corresponding to the uplink signal transmitted on the component carrier.

[0010] According to another aspect of the present disclosure, a base station for performing wireless communications in a wireless communication system is provided, the wireless communication system comprising the base station and a user equipment, the user equipment communicating with the base station via multiple component carriers in a carrier aggregation manner, the base station comprising: a priority allocation unit, for assigning a priority to each component carrier based on at least one of the following rules, so that the user equipment selects a component carrier with the highest priority to transmit an uplink signal on an overlapping uplink subframe: an expected power loss for transmitting the uplink signal on the component carrier; a burden for transmitting the uplink signal on the component carrier; a number of uplink subframes of the component carrier; and primary and secondary attributes of a component carrier for transmitting a downlink signal corresponding to the uplink signal transmitted on the component carrier.

[0011] According to another aspect of the present disclosure, a user equipment for wireless communication in a wireless communication system is provided, the wireless communication system comprising a base station according to the present disclosure and the user equipment, the user equipment communicating with the base station through multiple component carriers in a carrier aggregation manner, the user equipment comprising: a receiving unit, configured to receive priority setting and change information of the component carriers transmitted by the base station, and information related to a determination principle of feedback timing of a physical uplink control channel PUCCH signal; a selecting unit, configured to select a component carrier with the highest priority among aggregated carriers where uplink subframes overlap, and select a feedback timing of the PUCCH signal and a scheduling timing of a physical uplink shared channel PUSCH signal according to the determination principle of the feedback timing among aggregated carriers where downlink subframes overlap; and a transmitting unit, configured to transmit an uplink signal via the component carrier, the feedback timing of the PUCCH signal and the scheduling timing of the PUSCH signal selected by the selecting unit, or to transmit an uplink signal according to the component carrier, the feedback timing of the PUCCH signal and the scheduling timing of the PUSCH signal dynamically indicated by downlink control information DCI signaling in the overlapping downlink subframes.

[0012] According to the method for wireless communication in a wireless communication system disclosed in the present invention, the base station and the user equipment can enable the user equipment to select one of the multiple component carriers based on the priority to transmit the uplink signal by assigning a priority to each of the multiple component carriers. In addition, the feedback timing of the overlapping downlink subframes is determined according to at least one of the delay requirement of the user equipment service, the energy saving requirement of the user equipment, and the implementation complexity. In this way, the transmission carrier of the uplink signal, especially the PUCCH, can be flexibly adjusted, and the transmission performance of the uplink signal is optimized.

[0013] Further areas of applicability will become apparent from the description provided herein.The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure. In the drawings:

[0015] Figure 1 is a schematic diagram illustrating a carrier aggregation scenario within a base station;

[0016] Figure 2 is a schematic diagram illustrating a scenario of carrier aggregation between base stations;

[0017] Figure 3 is a schematic diagram illustrating another scenario of carrier aggregation between base stations;

[0018] Figure 4 is a schematic diagram illustrating a TDD uplink and downlink configuration;

[0019] Figure 5 is a schematic diagram illustrating a downlink HARQ PUCCH feedback timing based on delay;

[0020] Figure 6 is a schematic diagram illustrating a downlink HARQ PUCCH feedback timing based on energy saving priority;

[0021] Figure 7 is a block diagram illustrating a wireless communication system according to an embodiment of the present disclosure; and

[0022] Figure 8 is a block diagram of an exemplary structure of a general-purpose personal computer in which the method for wireless communication in a wireless communication system according to an embodiment of the present disclosure can be implemented.

[0023] Although the present disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown as examples in the drawings and are described in detail herein. It should be understood, however, that the description of specific embodiments herein is not intended to limit the present disclosure to the specific forms disclosed, but rather, the present disclosure is intended to cover all modifications, equivalents, and alternatives that fall within the spirit and scope of the present disclosure. It should be noted that throughout the several drawings, corresponding reference numerals indicate corresponding parts. DETAILED DESCRIPTION

[0024] Examples of the present disclosure will now be described more fully with reference to the accompanying drawings.The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.

[0025] Example embodiments are provided so that the disclosure will be exhaustive and its scope will be fully conveyed to those skilled in the art. Numerous specific details such as examples of specific components, devices and methods are set forth to provide a detailed understanding of the embodiments of the present disclosure. It will be apparent to those skilled in the art that the example embodiments may be implemented in many different forms without the use of specific details, none of which should be construed as limiting the scope of the present disclosure. In certain example embodiments, well-known processes, well-known structures and well-known techniques are not described in detail.

[0026] First refer to Figures 1 to 3 To describe the scenarios to which the technical solutions according to the embodiments of the present disclosure can be applied.

[0027] Figure 1 The figure shows the scenario of carrier aggregation within a base station. Figure 1 In the scenario shown, UE (User Equipment) 200 communicates with macro base station 100 via two component carriers CC1 and CC2 in a carrier aggregation manner. The coverage a of component carrier CC1 is larger than the coverage b of component carrier CC2, and the frequency of component carrier CC1 is lower than the frequency of component carrier CC2.

[0028] Figure 2 The figure shows the scenario of carrier aggregation between base stations. Figure 2 In the scenario shown, UE 200 communicates with macro base station 100 through two component carriers CC1 and CC2 in a carrier aggregation manner, and further communicates with LPN (Low Power Node) 300 through component carrier CC3. The coverage range a of component carrier CC1 is greater than the coverage range b of component carrier CC2, and the coverage range b of component carrier CC2 is greater than the coverage range c of component carrier CC3. Furthermore, the frequency of component carrier CC1 is lower than the frequency of component carrier CC2, and the frequency of component carrier CC2 is lower than the frequency of component carrier CC3.

[0029] Figure 3 The figure shows another scenario of carrier aggregation between base stations. Figure 3 In the illustrated scenario, UE 200 communicates with macro base station 100 via component carrier CC1 in a carrier aggregation manner, and further communicates with LPN 300 via component carriers CC2 and CC3. The coverage a of component carrier CC1 is greater than the coverage b of component carrier CC2, and the coverage b of component carrier CC2 is greater than the coverage c of component carrier CC3. Further, the frequency of component carrier CC1 is lower than the frequency of component carrier CC2, and the frequency of component carrier CC2 is lower than the frequency of component carrier CC3.

[0030] Figures 1 to 3 The diagram only illustrates an example of a scenario in which the technical solution according to the embodiment of the present disclosure can be applied, and the present disclosure is not limited thereto. For example, the number of component carriers participating in carrier aggregation is not limited to two or three, but may be more. Figure 1 In the illustrated scenario, the UE 200 communicates with the macro base station 100 in a carrier aggregation manner. However, the UE 200 may also communicate with the LPN 300 in a similar manner.

[0031] As mentioned in the background technology section, LTE (Long Term Evolution) Rel-12 and later versions will support the following three basic types of carrier aggregation: 1) FDD (Frequency Division Duplexing) carrier aggregation or TDD (Time Division Duplexing) carrier aggregation with the same frequency band configuration; 2) TDD carrier aggregation with different uplink and downlink configurations; and 3) carrier aggregation between FDD and TDD.

[0032] In the first type of carrier aggregation, since the HARQ (Hybrid Automatic Repeat Request) timing of the main carrier is the same as the HARQ timing of the auxiliary carrier, the original mechanism of PUCCH (Physical Uplink Control Channel) feedback based on the main carrier will not affect the feedback delay and thus affect the user's QoS (Quality of Service) experience. Therefore, when the PUCCH capacity of the main carrier is sufficient (meaning that all downlink data transmissions can be fed back), flexible data transmission can be achieved on all downlink resources. In summary, for the first type of carrier aggregation, the problem of reducing feedback delay will not be involved. The present disclosure will mainly consider how to solve the PUCCH diversion on the main carrier and reduce the power consumption of the user equipment sending uplink signals.

[0033] In the second type of carrier aggregation, if the uplink subframe of the TDD primary carrier is a superset of the uplink subframe of the TDD secondary carrier (i.e., the downlink subframe of the primary carrier is a subset of the downlink subframe of the secondary carrier), then in the existing scheme, the secondary carrier follows its own downlink HARQ timing in the case of self-scheduling, and follows the downlink HARQ timing of the primary scheduling carrier in the case of cross-carrier scheduling. Because the uplink subframe of the primary carrier is a superset of the uplink subframe of other carriers, whether it is self-scheduling on each carrier or cross-carrier scheduling between carriers, whether it follows its own PUCCH feedback timing or follows the PUCCH feedback timing of the primary scheduling carrier, PUCCH feedback resources can always be found on the primary carrier. Therefore, as long as self-scheduling is used on non-overlapping subframes, using cross-carrier scheduling or self-scheduling on overlapping subframes will not cause waste of secondary carrier downlink resources.

[0034] Furthermore, if the uplink subframe of the TDD primary carrier is a subset of the uplink subframe of the TDD secondary carrier (i.e., the downlink subframe of the primary carrier is a superset of the downlink subframe of the secondary carrier), then according to the existing standards, the secondary carrier can only follow the downlink HARQ timing of the primary carrier, whether it is self-scheduling or cross-carrier scheduling. This does not lead to a waste of downlink resources of the secondary carrier. However, due to the small number of uplink time slots of the primary carrier, the overall feedback delay is relatively long, especially for some downlink subframes configured 2-5.

[0035] Figure 4 The figure shows 7 different TDD uplink and downlink configurations, where the shaded boxes represent downlink subframes and the unshaded boxes represent uplink subframes. The number n in the unshaded box indicates that the A / N information of the current uplink frame is fed back for the downlink data of the previous n subframes. Among the 7 configurations, the combination of configurations {1,3}, {2,3} and {2,4} does not satisfy the superset and subset relationship between the uplink and downlink subframes, where the combination of {1,3} complies with the downlink HARQ timing of configuration 4, and the other two combinations comply with the downlink HARQ timing of configuration 5. Such timing adjustment enables all aggregated downlink resources to be scheduled, but it also leads to a sharp increase in the uplink feedback burden of uplink subframes 2 and / or 3. In particular, when configuration 5 has only one uplink feedback subframe, feedback can only be performed through A / N Bundling (i.e., A is fed back only when all downlink subframes are correctly received, otherwise N is fed back). This may cause unnecessary downlink retransmission and congestion of uplink feedback resources of the feedback carrier, because PUCCH feedback cannot be shared on other time slots.

[0036] In particular, in the third type of FDD-TDD carrier aggregation, if the TDD carrier is used as the primary carrier, it may not be able to obtain the corresponding uplink transmission resources according to the FDD downlink HARQ transmission timing because it has fewer uplink carrier resources configured. In this way, in addition to increasing the uplink feedback burden of the TDD primary carrier, it will also cause some FDD downlink resources to be wasted (downlink transmission is abandoned because there is no uplink resource with corresponding feedback), or it will not be able to effectively retransmit according to the FDD downlink HARQ timing (even if downlink transmission is performed, no feedback can be obtained, and thus retransmission is impossible).

[0037] Therefore, it is necessary to provide a solution for wireless communication in a wireless communication system, which can effectively support the dynamic selection of uplink signals, especially PUCCH transmission carriers, and ensure the transmission efficiency of the network based on limited PUCCH capacity. In addition, it can also be dynamically adjusted according to at least one of the load condition of the cell PUCCH and the energy consumption of the terminal PUCCH transmission. Further, the dynamic adjustment of PUCCH will lead to changes in the feedback time slot of the downlink HARQ in the above-mentioned second and third types of carrier aggregation. Therefore, the inventors of the present disclosure also consider the processing of such problems to optimize the design of the air interface transmission scheme.

[0038] According to an embodiment of the present disclosure, a method for performing wireless communication in a wireless communication system is provided. Figures 1 to 3 As shown, the wireless communication system includes a base station such as a macro base station 100 and / or an LPN 300 and a user equipment such as a UE 200. The user equipment communicates with the base station through multiple component carriers such as CC1, CC2 or CC3 in a carrier aggregation manner. The method includes allocating a priority to each component carrier based on at least one of the following rules by the base station: the expected power loss of transmitting an uplink signal on the component carrier; the burden of transmitting an uplink signal on the component carrier; the number of uplink subframes of the component carrier; and the primary and secondary attributes of the component carrier that transmits a downlink signal corresponding to the uplink signal transmitted on the component carrier. The user equipment can select the component carrier with the highest priority to transmit the uplink signal on the overlapping uplink subframes.

[0039] In the method according to the embodiment of the present disclosure, PUCCH is no longer limited to being transmitted only on the uplink main carrier, but can select one of multiple component carriers for transmission based on priority. In this way, the transmission carrier of PUCCH can be flexibly adjusted, optimizing the transmission performance of downlink data and PUCCH.

[0040] According to an embodiment of the present disclosure, the uplink signal may include at least one of a PUCCH signal and a PUSCH (Physical Uplink Shared Channel) signal. In addition, the base station may also include at least one of a macro base station and a low-power node.

[0041] In the method according to an embodiment of the present disclosure, when priority is allocated based on the number of uplink subframes of a component carrier, a component carrier with a larger number of uplink subframes may have a higher priority. Specifically, the priority of an FDD carrier may be higher than that of a TDD carrier, and a TDD component carrier with the following configurations may have a lower priority in order: configuration 0, configuration 6, configuration 1, configuration 3, configuration 4, and configuration 5, and a TDD component carrier with configuration 2 may have the same priority as a TDD component carrier with configuration 4.

[0042] In the method according to an embodiment of the present disclosure, when priorities are allocated based on the primary and secondary attributes of a component carrier transmitting a downlink signal, if the component carrier transmitting the downlink signal is a primary component carrier, the corresponding component carrier transmitting the uplink signal may have a higher priority. Accordingly, if the component carrier transmitting the downlink signal is a secondary component carrier, the corresponding component carrier transmitting the uplink signal will have a lower priority.

[0043] In the method according to an embodiment of the present disclosure, when priorities are assigned based on the burden of transmitting uplink signals on component carriers, component carriers that provide a larger coverage range and / or provide services for more user equipment may have a lower priority. Correspondingly, component carriers that have a smaller coverage range and / or provide services for fewer user equipment may have a higher priority. The base station may determine the coverage range of a carrier based on factors such as the frequency band of the carrier and whether there is a relay amplifier. Generally speaking, carriers with lower frequency bands have a larger coverage range, and carriers with relay amplifiers in cells covered by the same frequency band have a larger coverage range.

[0044] In the method according to an embodiment of the present disclosure, when priorities are assigned based on the expected power loss of transmitting uplink signals on component carriers, component carriers with lower expected power loss may have higher priority. Further, the expected power loss is determined based on the coverage and / or downlink path loss of the carrier. For example, in the case where the base station includes only one of a macro base station and an LPN, a component carrier with a lower frequency may have a higher priority. If the base station includes both a macro base station and an LPN, a component carrier belonging to a low-power node may have a higher priority.

[0045] According to an embodiment of the present disclosure, when the uplink signal is a PUCCH signal and the PUCCH signal includes feedback information, the base station may further allocate a priority based on a feedback delay of the PUCCH signal of the component carrier.

[0046] In the method according to an embodiment of the present disclosure, when priority is allocated based on the feedback delay of the PUCCH signal of the component carrier, the FDD component carrier may have a higher priority than the TDD component carrier, and the TDD component carriers having the following configurations may have a lower priority in order: configuration 0, configuration 1, configuration 6, configuration 3, configuration 4, and configuration 5, and the TDD component carrier having configuration 2 may have the same priority as the TDD component carrier having configuration 3.

[0047] For example, when PUCCH resources are transmitted in overlapping uplink subframes of aggregated carriers within a base station, Figure 1 and 2 From the perspective of , the power consumption of PUCCH feedback on component carrier CC1 should be lower than that on component carrier CC2. However, due to the larger coverage of component carrier CC1, the PUCCH feedback burden is higher than that on component carrier CC1. Therefore, the PUCCH feedback priority of some carrier aggregation terminals on component carrier CC2 can be set higher than that on component carrier CC1. Figure 2 When inter-base station carrier aggregation occurs for UE 200, due to the distance from the terminal and its own coverage, the PUCCH burden and feedback consumption of component carrier CC3 are both minimal. Figure 2 The feedback priority is set to CC3>CC2>CC1.

[0048] Similarly, when PUCCH resources are transmitted in overlapping uplink subframes of aggregated carriers within a base station, Figure 3 From the perspective of PUCCH, the power consumption of component carrier CC2 for PUCCH feedback should be lower than that of component carrier CC3. At the same time, since there are fewer users in LPN 300, the overall PUCCH feedback burden is not heavy, so the PUCCH feedback priority of component carrier CC2 can be set higher than that of component carrier CC3. Figure 3 When inter-base station carrier aggregation occurs for UE 200, due to the distance from the terminal and its own coverage, the PUCCH burden and feedback consumption of component carrier CC1 are both the largest. Figure 3 The feedback priority is set as CC2>CC3>CC1.

[0049] According to an embodiment of the present disclosure, the base station may notify the user equipment of the priority setting and change of the component carrier through RRC (Radio Resource Control) signaling or MAC (Media Access Control) signaling.

[0050] That is, when the priority level changes, the base station may also notify the user equipment of the changed priority level through RRC signaling or MAC signaling.

[0051] Furthermore, the user equipment may select the component carrier with the highest priority to transmit the uplink signal.

[0052] It should be noted that the base station in the present disclosure may evaluate the priority of the component carrier based on multiple rules. Specifically, for example, the priority can be evaluated according to multiple rules respectively and the final priority can be determined by combining multiple evaluation results. It can also be dynamically selected among the multiple rules according to the specific situation, and the priority will be evaluated according to the selected rule. In addition, the rule based on which the base station in the present disclosure evaluates the priority of the component carrier can also be static. For example, the priority can be fixedly evaluated according to at least one of the rules. For the above situations, they will not be described one by one here.

[0053] The above describes the dynamic adjustment of the transmission of uplink signals on multiple component carriers. As mentioned above, the dynamic adjustment of uplink signals such as PUCCH will cause changes in the feedback time slot of downlink HARQ in the above-mentioned second and third types of carrier aggregation. The following will describe the processing of such problems to optimize the design of the air interface transmission scheme. It should be noted that the following technical solutions provided by the present disclosure are not necessarily based on the above-mentioned uplink signal dynamic adjustment solution, which can be implemented separately to solve the corresponding technical problems.

[0054] Since the uplink transmission resources available to the aggregated carrier in the time domain are the union of all aggregated carriers, all TDD carriers can determine their own PUCCH feedback time slots according to their own downlink PDSCH (Physical Downlink Shared Channel) transmission timing relationship when dynamic PUCCH carrier feedback is supported. Moreover, they follow their own PUCCH feedback timing on non-overlapping downlink subframes. The FDD carriers in the aggregated carriers use the same timing, and the carriers with the same TDD uplink and downlink configurations use the same timing. At the same time, when determining the PUCCH feedback timing, the scheduling timing of the PUSCH on each carrier can be kept the same as the PUCCH feedback timing, or it can follow the original PUSCH scheduling timing.

[0055] According to an embodiment of the present disclosure, when there are overlapping downlink subframes among multiple component carriers and there is PDSCH transmission on the overlapping downlink subframes, the base station and / or the user equipment can determine the feedback timing of the PUCCH signal corresponding to the component carrier with PDSCH transmission on the overlapping downlink subframes according to one of the following principles: the feedback timing of the component carrier with the highest priority among the uplink component carriers corresponding to the component carrier with PDSCH transmission on the overlapping downlink subframes; the feedback timing of the component carrier with the lowest feedback delay among the uplink component carriers corresponding to the component carrier with PDSCH transmission on the overlapping downlink subframes; the feedback timing of the main scheduling component carrier in the cross-carrier scheduling process; and the feedback timing of the component carrier itself with PDSCH transmission on the overlapping downlink subframes.

[0056] Preferably, in the case where the feedback timing of the PUCCH signal is determined based on the feedback timing of the component carrier with the highest priority or the feedback timing of the component carrier with the lowest feedback delay, if the obtained delay gain or uplink transmit power gain is lower than a predetermined threshold and causes the number of downlink subframes associated with the uplink subframe used to transmit the PUCCH signal of the component carrier to increase and exceed two, the feedback timing of the component carrier itself on which there is PDSCH transmission on the overlapping downlink subframe can be selected as the feedback timing of the PUCCH signal.

[0057] Further, the base station may select one of the following as the scheduling timing of the PUSCH signal of the component carrier corresponding to the overlapping downlink subframe on the overlapping downlink subframe: the feedback timing of the PUCCH signal of the component carrier; and the scheduling timing of the PUSCH signal of the current component carrier.

[0058] According to an embodiment of the present disclosure, the base station may determine the principle of feedback timing of the PUCCH signal based on at least one of the delay requirement of the downlink signal, the energy saving requirement of the user equipment, and the implementation complexity.

[0059] Furthermore, the base station may inform the user equipment of the determination principle of the feedback timing of the PUCCH signal to be followed by the component carrier through RRC signaling or MAC signaling.

[0060] In addition, when it is necessary to dynamically adjust the PUCCH feedback carrier and / or PUCCH feedback timing of the component carrier for PDSCH transmission on the overlapping downlink subframe, the redundant or newly added bit information of the DCI (Downlink Control Information) scheduled by PDSCH can be used to dynamically specify the PUCCH feedback carrier on the overlapping downlink subframe and / or the feedback timing of the PUCCH signal corresponding to the PDSCH transmission of the component carrier.

[0061] For example, the feedback timing of the PUCCH signal corresponding to the PDSCH transmission of the PUCCH feedback carrier and / or component carrier on the overlapping downlink subframe may be specified by adding bits to the DCI.

[0062] The following first describes in detail the carrier aggregation between FDD and TDD, that is, the third type of carrier aggregation.

[0063] The PUCCH feedback of TDD aggregated carriers can be carried out according to the original timing or according to the FDD timing. For example, when the TDD carrier takes configuration 5, if PUCCH feedback is performed according to the original timing, the downlink transmission delay will be greatly increased compared to the feedback according to the FDD timing, and A / N Bundling will be required to reduce the accuracy of the feedback. However, when the TDD carrier takes configuration 0, there is little difference between feedback according to its own timing and feedback according to the FDD timing. Therefore, in the case of FDD and TDD carrier aggregation, in order to avoid A / N Bundling and large delays, such as Figure 4 The configurations shown in the figure are configurations 2 / 3 / 4 / 5 where the number of uplink subframes associated with downlink subframes exceeds 2. The carriers of these configurations preferably follow the timing of FDD. Except for configuration 0, the other configurations have a downlink HARQ timing RTT (Round-Trip Time) greater than 10ms. All of them are deployed according to the FDD timing, which helps reduce the data retransmission delay and improve the QoS experience of real-time services. The FDD carrier only follows its own downlink HARQ feedback timing.

[0064] However, in the case of carrier aggregation between base stations, assuming that the FDD carrier is a macro carrier and the TDD carrier is a service carrier of the LPN, if the timing of the FDD carrier is followed, feedback is performed on the TDD carrier on the overlapping uplink subframes and feedback is performed on the FDD carrier on the non-overlapping uplink subframes, which is more power-consuming than the UE following the TDD timing for PUCCH feedback on the TDD carrier on the overlapping downlink subframes. For example, assume the case of an FDD macro base station carrier and a TDD low-power node carrier with uplink and downlink configuration of 5. In this case, if the TDD carrier follows the FDD timing for HARQ feedback, only subframe 2 can perform PUCCH feedback, and it is obvious that the UE power consumption is greatly increased. Therefore, in this case, if the transmission of downlink non-real-time services is performed, it is more conducive to saving the UE's PUCCH transmission power if the TDD carrier follows its own PUCCH feedback timing or the PUCCH feedback timing on other TDD carriers on the same node, while the FDD macro carrier is more suitable for transmitting real-time services because it can guarantee a lower PUCCH feedback delay. In particular, when the UE has multiple TDD aggregated carriers on the LPN, the overlapping downlink subframes can select the PUCCH feedback timing of the carrier with a lower frequency on the TDD carrier on the LPN to reduce the power consumption of UE feedback, or select feedback with shorter latency on the LPN, or follow the PUCCH feedback time slot of the main scheduling carrier when cross-carrier scheduling is performed within the LPN.

[0065] In the above situation, the static feedback timing of the TDD carrier is determined based on the service delay requirements, terminal transmission power saving or simple implementation requirements. The base station can notify the UE of the static timing that each aggregated carrier or all aggregated carriers should follow through RRC / MAC signaling. Under the needs of energy saving, delay and PUCCH load sharing, the PUCCH feedback time slot of the overlapping downlink subframe can also enable the dynamic adjustment function, that is, the DCI scheduled by the PDSCH can dynamically specify which TDD configuration / aggregated carrier the downlink subframe follows.

[0066] Next, the carrier aggregation of TDD with different uplink and downlink configurations, that is, the second type of carrier aggregation, is described in detail.

[0067] The biggest difference between the FDD carrier in the carrier aggregation between FDD and TDD is that the TDD carrier in the uplink subframe superset position is in the subset position in the downlink subframe, while the FDD carrier is in the superset position compared to the TDD carrier in both uplink and downlink, and the TDD uplink superset carrier does not have to stick to its own PUCCH feedback timing. In the case of carrier aggregation of TDD with different uplink and downlink configurations, in addition to following its own feedback timing on the overlapping subframes, the TDD carrier can also follow, for example: if there are multiple feedback time points on the overlapping downlink subframes, select the uplink time slot with a short feedback time to transmit the PUCCH; follow the timing of the main scheduling carrier during cross-carrier scheduling; follow the timing of the carrier with low power consumption nodes; or in the case where there is no uplink and downlink subframe superset subset relationship between the aggregated carriers, the uplink feedback timing follows the PUCCH feedback timing of the uplink and downlink configurations that are equal in number and position to the intersection subframes of their uplink subframes.

[0068] Figure 5 The example of the PUCCH feedback timing determination result under a specific aggregation carrier configuration combination is shown, which is a criterion for the shortest feedback time for real-time services and its further optimized solution. Figure 5 In the figure, the shaded boxes represent downlink subframes, while the unshaded boxes represent uplink subframes. The number n in the unshaded boxes indicates that the A / N information of this uplink frame is the downlink data feedback for the previous n subframes. Figure 5 In the figure, the value in the box without brackets and the value therein is the value of the original timing, the value in the brackets in the box with brackets and the value therein is also the value of the original timing, and the value outside the brackets is the value of the adjusted timing. Here, the basic principle for adjusting the numbers in the downlink subframe is to "take the smaller one" when comparing different configurations, that is, to take the one with the smaller digital value.

[0069] like Figure 5 As shown in Table 1, when the aggregated carriers satisfy the uplink superset subset relationship, it can be seen that in configuration 6_A, except for subframe 6, the delay saved by other downlink subframes with changed timing is greater than or equal to 3ms. Subframe 6 in configuration 6 follows the timing of configuration 3 and saves 1ms, which has limited impact on the QoS of real-time data transmission. Therefore, this subframe can also keep the original feedback timing unchanged, that is, adopt the feedback timing of configuration 6_B.

[0070] like Figure 5As shown in Table 2, when the aggregated carrier does not satisfy the uplink superset subset relationship (i.e., there are only configurations 1 / 3 of the combinations), for the case of following the feedback delay optimization criterion, subframe 9 can only save 1ms of delay (such as configuration 3_B). However, the number of feedback slots in subframe 3 in configuration 3_B has increased compared to the original, and when dual codeword feedback is supported on an uplink subframe without the need for A / N Bundling, an uplink subframe is associated with at most two downlink subframes at the same time, while subframe 3 of configuration 3_B is converted from 2 subframes to support 3 subframes, for which A / N Bundling is required to support the maximum number of feedback subframes and codewords. At this time, if subframe 9 maintains the original scheduling of configuration 3, it can be ensured that A / N Bundling is not required in all PUCCH feedbacks of this combination. Therefore, configuration 3_A in Table 2 is a better timing relationship result.

[0071] Furthermore, assuming that an aggregate carrier with configuration 4 is added, the timing of configuration 1 / 3 does not change. However, configuration 4 has 1ms of latency optimization space in subframe 6 and subframe 8. From the four option combinations, it can be seen that it is better to optimize the latency of at least one subframe than to keep the original PUCCH feedback timing. This is because there are only three downlink associated carriers in subframe 2 and subframe 3 where A / N Bundling may be required, while configuration 4_B in Table 2 has four associated carriers in subframe 3, which greatly increases the possibility of A / N Bundling.

[0072] like Figure 5 As shown in Table 3, when carrier aggregation of configurations 2, 3, and 4 is performed, there is still 1ms of latency optimization space for configuration 4 in subframes 6 and 8. In the case of keeping unchanged or optimizing all, only one uplink subframe may need A / N Bundling, but the uplink subframe needs to be associated with 4 downlink subframes, and the probability of A / N Bundling is high. In the case of only optimizing the PUCCH feedback latency for subframe 6 or subframe 8, A / N Bundling may occur in subframe 2 and subframe 3 because they are associated with 3 downlink subframes respectively.

[0073] In the case of transmitting non-real-time services, considering the feedback power consumption of the terminal, in the overlapping downlink subframes, only the PUCCH feedback timing of the carrier with the lowest power consumption can be followed. Alternatively, among the many optional PUCCH feedback timings in the overlapping downlink subframes, the feedback timing delay is sorted from low to high. If PUCCH feedback according to the feedback timing with low feedback delay can find the corresponding uplink resource on the carrier or carrier group with low power consumption, feedback is performed according to the feedback timing with low feedback delay.

[0074] Figure 6The figure shows the downlink HARQ PUCCH feedback timing based on energy saving priority. Figure 6 In the figure, the shaded boxes represent downlink subframes, while the unshaded boxes represent uplink subframes. The number n in the unshaded boxes indicates that the A / N information of this uplink frame is the downlink data feedback for the previous n subframes. Figure 6 In the figure, the values ​​in the boxes without brackets and the values ​​therein are the values ​​of the original time series, the values ​​in the brackets in the boxes with brackets and the values ​​therein are also the values ​​of the original time series, and the values ​​outside the brackets are the values ​​of the adjusted time series.

[0075] Take two aggregated carriers configured as {3, 6} as an example (this embodiment can be extended to other carrier aggregation scenarios that satisfy the uplink subset and superset relationship). If the carrier configured as 6 is an uplink low-power carrier, the simplest processing is as follows Figure 6 As shown in Table 1, in the overlapping downlink subframes, the carrier with configuration 3 fully complies with the PUCCH feedback timing of the carrier with configuration 6. However, for time slot 0, it will cause unnecessary delay increase, because subframe 4 of the carrier with configuration 6 following the timing of configuration 3 can also be used for PUCCH feedback of subframe 0. In addition, the timing adjustment of subframe 6 also brings about a delay increase of 1ms. Among the many optional PUCCH feedback timings of overlapping downlink subframes, the PUCCH feedback time slots of downlink subframes 0 / 1 / 6 are different, but the low-power carrier with configuration 6 as the time slot with the shortest delay has corresponding uplink resources. Therefore, the time slot adjustment can be as follows Figure 6 As shown in Table 2. Of course, since the carrier of configuration 6 only saves 1 ms of delay in subframe 6, the original feedback timing can also be kept unchanged.

[0076] In the scenario of inter-base station carrier aggregation, assume that the aggregated carrier of the macro base station is configuration 1, and the two aggregated carriers of the LPN are configuration 2 and configuration 3, where the frequency of configuration 2 is lower than the frequency of configuration 3. Their power consumption priority order is configuration 2, configuration 3, and configuration 1. Since the carriers of configuration 2 and configuration 3 are both located in the LPN, the difference in their PUCCH transmit power should be within a specific threshold, and they can be considered as a carrier group with low power consumption.

[0077] like Figure 6 As shown in Table 3, when all overlapping downlink carriers follow the PUCCH feedback timing of the lowest power consumption carrier, there is room for latency optimization in subframes 0 / 9, and there is room for feedback capacity optimization in subframes 2 / 3 / 4 of configuration 3 (i.e., there are 3 associated downlink subframes in subframe 2 of configuration 3 that may have A / N Bundling, and the feedback capacity of the other two uplink subframes of the configuration has not reached saturation when A / N Bundling is not required).

[0078] Further, consider changing the criteria as follows: among the many optional PUCCH feedback timings of overlapping downlink subframes, when overlapping downlink carriers between base stations appear, follow the feedback timing with the lowest feedback delay in the carrier group with the lowest power consumption for PUCCH feedback. In this case, when only overlapping downlink carriers appear within the base station, follow the node with the lowest delay for feedback, and you can get the following: Figure 6 The timing relationship is shown in Table 4.

[0079] However, there is still room for optimizing the feedback capacity of subframes 2 / 4 of configuration 3 (i.e., there are 3 associated downlink subframes in subframe 2 of configuration 3, which may cause A / N Bundling, and the feedback capacity of subframe 4 has not reached saturation when A / N Bundling is not required). Therefore, for downlink subframe 8 of configuration 3 in Table 4, while maintaining the original PUCCH feedback timing, the corresponding uplink resources can still be found on the carrier group with low power consumption, and the delay is only increased by 1ms compared to the optimal delay, which will not have a significant impact on the service transmission delay. Figure 6 Table 5 in shows the adjustment results.

[0080] Alternatively, among the multiple optional PUCCH feedback timings in the overlapping downlink subframes, the feedback timing delay is sorted from low to high. If PUCCH feedback according to the feedback timing with low feedback delay can find the corresponding uplink resource on the carrier group with low power consumption, feedback is performed according to the feedback timing with low feedback delay. In this way, the following can be obtained: Figure 6 The timing relationship is shown in Table 6.

[0081] However, there is still room for optimizing the feedback capacity of subframes 2 / 4 of configuration 3 (i.e., there are 3 associated downlink subframes in subframe 2 of configuration 3, which may cause A / N Bundling, and the feedback capacity of subframe 4 has not reached saturation when A / N Bundling is not required). Therefore, for downlink subframes 8 / 9 of configuration 3 in Table 6, while maintaining the original PUCCH feedback timing, the corresponding uplink resources can still be found on the carrier group with low power consumption, and the delay is only increased by 1ms compared to the optimal delay, which will not have a significant impact on the service transmission delay. Figure 6 Table 7 in the table shows the adjustment results.

[0082] In the above situation, the static feedback timing of the TDD carrier is determined based on the service delay requirement, terminal transmission power saving or simple implementation requirements. The base station can notify the UE of the static timing that each aggregated carrier or all aggregated carriers should follow through RRC / MAC signaling. Under the needs of energy saving, delay and PUCCH load sharing, the PUCCH feedback time slot of the overlapping downlink subframe can also enable the dynamic adjustment function, that is, the DCI scheduled by the PDSCH can dynamically specify which TDD configuration / aggregated carrier the downlink subframe follows.

[0083] If dynamic timing adjustment and feedback carrier selection signaling need to be implemented when downlink data is sent, since the terminal currently supports up to 5 aggregated carriers, 5 bits can be added to the DCI to notify which carrier to select for feedback in a bitmap manner (for example, the carriers are numbered from high to low or from low to high in frequency, 0 / 1 indicates that the carrier numbered by the bit does not perform PUCCH feedback, and 1 / 0 indicates that the carrier numbered by the bit performs PUCCH feedback). If the PUCCH feedback timing is further limited to follow the timing of the feedback carrier, then 5 bits can achieve the functional requirements of dynamic timing adjustment and feedback carrier. Otherwise, when the default feedback timing needs to be adjusted, an additional 5 bits are still required to indicate which carrier's feedback timing needs to be followed.

[0084] Furthermore, since the carriers for which feedback is given and the carriers for which feedback timing should be followed are known by default, the 5-bit bitmap in the above example can be reduced to a 4-bit bitmap to distinguish other aggregated carriers. Alternatively, 2 bits can be used to indicate which carrier is to perform PUCCH feedback or which carrier's PUCCH feedback timing is to be followed.

[0085] According to an embodiment of the present disclosure, in a carrier aggregation scenario, a wireless cellular communication system adjusts the downlink HARQ A / N feedback timing according to the existence of multiple PUCCH feedback time points in the overlapping downlink subframes of the aggregated carriers, and flexibly adjusts the transmission carrier of the PUCCH according to the overlapping uplink subframes, thereby optimizing the transmission performance of downlink data and PUCCH.

[0086] Combine the following Figure 7 The wireless communication system according to the embodiment of the present disclosure is described. Figure 7As shown, the wireless communication system according to an embodiment of the present disclosure includes a base station 100 and a user equipment 200, and the user equipment 200 communicates with the base station 100 through multiple component carriers in a carrier aggregation manner. The base station 100 may include but is not limited to a priority allocation unit 110, a transmission unit 120, a determination unit 130, a notification unit 140, a designation unit 150, and a receiving unit 160. The user equipment 200 may include but is not limited to a receiving unit 210, a selection unit 220, and a transmission unit 230.

[0087] The priority assignment unit 110 may assign a priority to each component carrier based on at least one of the following rules so that the user equipment 200 can select a component carrier with the highest priority to transmit an uplink signal on an overlapping uplink subframe: the expected power loss of transmitting an uplink signal on the component carrier; the burden of transmitting an uplink signal on the component carrier; the number of uplink subframes of the component carrier; and the primary and secondary attributes of the component carrier that transmits a downlink signal corresponding to the uplink signal transmitted on the component carrier.

[0088] Preferably, the uplink signal may include at least one of a PUCCH signal and a PUSCH signal, and / or the base station 100 may include at least one of a macro base station and a low-power node.

[0089] Preferably, when the priority allocating unit 110 allocates priorities based on the number of uplink subframes of the component carriers, a component carrier with a larger number of uplink subframes may have a higher priority.

[0090] Preferably, when the priority allocating unit 110 allocates priorities based on the primary and secondary attributes of the component carrier transmitting the downlink signal, if the component carrier transmitting the downlink signal is the primary component carrier, the corresponding component carrier transmitting the uplink signal may have a higher priority.

[0091] Preferably, when the priority allocating unit 110 allocates priorities based on the burden of transmitting uplink signals on component carriers, component carriers that provide a larger coverage area and / or serve more user equipments may have a lower priority.

[0092] Preferably, when the priority allocating unit 110 allocates priorities based on the expected power loss of transmitting uplink signals on component carriers, component carriers with lower expected power loss may have higher priorities.

[0093] Preferably, when the priority allocation unit 110 allocates priorities based on the expected power loss of transmitting uplink signals on component carriers, if the base station 100 includes only one of a macro base station and a low-power node, the component carrier with a lower frequency may have a higher priority, and if the base station 100 includes both a macro base station and a low-power node, the component carrier belonging to the low-power node may have a higher priority.

[0094] Preferably, the uplink signal may be a PUCCH signal, and the PUCCH signal includes feedback information, and the priority allocation unit 110 may further allocate the priority based on the feedback delay of the PUCCH signal of the component carrier.

[0095] Preferably, when the priority allocation unit 110 allocates priority based on the feedback delay of the PUCCH signal of the component carrier, the FDD component carrier may have a higher priority than the TDD component carrier, and the TDD component carriers having the following configurations may have a lower priority in order: configuration 0, configuration 1, configuration 6, configuration 3, configuration 4 and configuration 5, and the TDD component carrier having configuration 2 may have the same priority as the TDD component carrier having configuration 3.

[0096] Furthermore, the transmission unit 120 may notify the user equipment 200 of the priority setting and change information of the component carriers through RRC signaling or MAC signaling.

[0097] That is, when the priority changes, the transmission unit 120 may also notify the user equipment 200 of the changed priority through RRC signaling or MAC signaling.

[0098] Further, when there are overlapping downlink subframes among multiple component carriers and there is PDSCH transmission on the overlapping downlink subframes, the determination unit 130 can determine the feedback timing of the PUCCH signal corresponding to the component carrier with PDSCH transmission on the overlapping downlink subframes according to one of the following principles: the feedback timing of the component carrier with the highest priority among the uplink component carriers corresponding to the component carrier with PDSCH transmission on the overlapping downlink subframes; the feedback timing of the component carrier with the lowest feedback delay among the uplink component carriers corresponding to the component carrier with PDSCH transmission on the overlapping downlink subframes; the feedback timing of the main scheduling component carrier in the cross-carrier scheduling process; and the feedback timing of the component carrier itself with PDSCH transmission on the overlapping downlink subframes.

[0099] Preferably, in the case where the determination unit 130 determines the feedback timing of the PUCCH signal based on the feedback timing of the component carrier with the highest priority or the feedback timing of the component carrier with the lowest feedback delay, if the obtained delay gain or uplink transmit power gain is lower than a predetermined threshold and causes the number of downlink subframes associated with the uplink subframe used to transmit the PUCCH signal of the component carrier to increase and exceed two, the determination unit 130 may select the feedback timing of the component carrier itself on which there is PDSCH transmission on the overlapping downlink subframe as the feedback timing of the PUCCH signal.

[0100] Preferably, the determination unit 130 may select one of the following as the scheduling timing of the PUSCH signal of the component carrier corresponding to the overlapping downlink subframe on the overlapping downlink subframe: the feedback timing of the PUCCH signal of the component carrier; and the scheduling timing of the PUSCH signal of the current component carrier.

[0101] Preferably, the determining unit 130 may determine the principle of the feedback timing of the PUCCH signal based on at least one of the delay requirement of the downlink signal, the energy saving requirement of the user equipment 200 and the implementation complexity.

[0102] Furthermore, the notification unit 140 may notify the user equipment 200 of the determination principle of the feedback timing of the PUCCH signal to be followed by the component carrier through RRC signaling or MAC signaling.

[0103] Further, when it is necessary to dynamically adjust the PUCCH feedback carrier and / or PUCCH feedback timing of the component carrier for PDSCH transmission on the overlapping downlink subframe, the designation unit 150 can utilize the redundant or newly added bit information of the DCI scheduled by the PDSCH to dynamically designate the PUCCH feedback carrier on the overlapping downlink subframe and / or the feedback timing of the PUCCH signal corresponding to the PDSCH transmission of the component carrier.

[0104] Preferably, the designating unit 150 may designate the feedback timing of the PUCCH signal corresponding to the PDSCH transmission of the PUCCH feedback carrier and / or component carrier on the overlapping downlink subframe by adding bits to the DCI.

[0105] Further, the receiving unit 210 of the user equipment 200 may receive the priority setting and change information of the component carrier transmitted by the base station 100. The receiving unit 210 may also receive the determination principle of the feedback timing of the PUCCH signal to be followed by the component carrier notified by the notification unit 140, and the feedback timing of the PUCCH signal corresponding to the PUCCH feedback carrier on the overlapping downlink subframe and / or the PDSCH transmission of the component carrier specified by the designation unit 150, and so on.

[0106] The selection unit 220 may select a component carrier with the highest priority among the aggregated carriers where uplink subframes overlap, and select a feedback timing of a PUCCH signal and a scheduling timing of a PUSCH signal according to a feedback timing determination principle among the aggregated carriers where downlink subframes overlap.

[0107] The transmission unit 230 can transmit the uplink signal via the component carrier selected by the selection unit 220, the feedback timing of the PUCCH signal and the scheduling timing of the PUSCH signal, or the transmission unit 230 can transmit the uplink signal according to the component carrier dynamically indicated by the DCI signaling in the overlapping downlink subframe, the feedback timing of the PUCCH signal and the scheduling timing of the PUSCH signal.

[0108] Various specific implementations of the above-mentioned units of the wireless communication system according to the embodiments of the present disclosure have been described in detail above and will not be repeated here.

[0109] Obviously, each operation process of the method for performing wireless communication in a wireless communication system according to the present disclosure can be implemented in the form of a computer executable program stored in various machine-readable storage media.

[0110] Moreover, the purpose of the present disclosure can also be achieved in the following manner: a storage medium storing the above-mentioned executable program code is directly or indirectly provided to a system or device, and a computer or a central processing unit (CPU) in the system or device reads out and executes the above-mentioned program code. In this case, as long as the system or device has the function of executing the program, the embodiment of the present disclosure is not limited to the program, and the program can also be in any form, for example, a target program, a program executed by an interpreter, or a script program provided to an operating system, etc.

[0111] The above-mentioned machine-readable storage media include, but are not limited to: various memories and storage units, semiconductor devices, disk units such as optical, magnetic and magneto-optical disks, and other media suitable for storing information.

[0112] In addition, the technical solution of the present disclosure can also be implemented by connecting a computer to a corresponding website on the Internet, downloading and installing the computer program code according to the present disclosure into the computer, and then executing the program.

[0113] Figure 8 The present invention is a block diagram of an exemplary structure of a general-purpose personal computer in which the method for wireless communication in a wireless communication system according to an embodiment of the present disclosure can be implemented.

[0114] like Figure 8As shown, a CPU 1301 performs various processes according to a program stored in a read-only memory (ROM) 1302 or a program loaded from a storage section 1308 to a random access memory (RAM) 1303. In the RAM 1303, data required when the CPU 1301 performs various processes and the like is also stored as needed. The CPU 1301, the ROM 1302, and the RAM 1303 are connected to each other via a bus 1304. An input / output interface 1305 is also connected to the bus 1304.

[0115] The following components are connected to the input / output interface 1305: an input section 1306 (including a keyboard, a mouse, etc.), an output section 1307 (including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.), a storage section 1308 (including a hard disk, etc.), a communication section 1309 (including a network interface card such as a LAN card, a modem, etc.). The communication section 1309 performs communication processing via a network such as the Internet. A drive 1310 may also be connected to the input / output interface 1305 as needed. A removable medium 1311 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is installed on the drive 1310 as needed, so that a computer program read therefrom is installed in the storage section 1308 as needed.

[0116] In the case where the above-described series of processing is realized by software, a program constituting the software is installed from a network such as the Internet or a storage medium such as the removable medium 1311 .

[0117] It should be understood by those skilled in the art that such storage media is not limited to Figure 8 The removable medium 1311 shown has a program stored therein and is distributed separately from the device to provide the program to the user. Examples of the removable medium 1311 include magnetic disks (including floppy disks (registered trademark)), optical disks (including compact disk read-only memory (CD-ROM) and digital versatile disks (DVD)), magneto-optical disks (including minidiscs (MD) (registered trademark)), and semiconductor memories. Alternatively, the storage medium may be the ROM 1302, a hard disk included in the storage section 1308, or the like, in which the program is stored and distributed to the user together with the device containing them.

[0118] Furthermore, the present disclosure also relates to the following configurations.

[0119] 1. A method for performing wireless communication in a wireless communication system, the wireless communication system comprising a base station and a user equipment, the user equipment communicating with the base station via multiple component carriers in a carrier aggregation manner, the method comprising:

[0120] The base station assigns a priority to each component carrier based on at least one of the following rules, so that the user equipment selects a component carrier with the highest priority in the overlapping uplink subframes to transmit an uplink signal:

[0121] an expected power loss for transmitting the uplink signal on the component carrier;

[0122] a burden of transmitting the uplink signal on the component carrier;

[0123] The number of uplink subframes of the component carrier; and

[0124] The primary and secondary attributes of a component carrier that transmits a downlink signal corresponding to the uplink signal transmitted on the component carrier.

[0125] 2. The method according to 1, wherein the uplink signal comprises at least one of a physical uplink control channel PUCCH signal and a physical uplink shared channel PUSCH signal, and / or

[0126] The base station includes at least one of a macro base station and a low power node.

[0127] 3. The method according to 1, wherein when the priority is allocated based on the number of uplink subframes of the component carrier, a component carrier with a larger number of uplink subframes has a higher priority.

[0128] 4. According to the method described in 1, when the priority is allocated based on the primary and secondary attributes of the component carrier transmitting the downlink signal, if the component carrier transmitting the downlink signal is the primary component carrier, the corresponding component carrier transmitting the uplink signal has a higher priority.

[0129] 5. The method according to 1, wherein, when the priority is allocated based on the burden of transmitting the uplink signal on the component carrier, a component carrier that provides a larger coverage area and / or serves more user equipments has a lower priority.

[0130] 6. The method according to 1, wherein when the priorities are assigned based on expected power losses for transmitting the uplink signals on the component carriers, component carriers having lower expected power losses have higher priorities.

[0131] 7. The method according to 2, wherein the uplink signal is the PUCCH signal, and the PUCCH signal includes feedback information, and

[0132] The base station further allocates the priority based on a feedback delay of a PUCCH signal of the component carrier.

[0133] 8. The method according to item 1, further comprising:

[0134] The base station notifies the user equipment of a message of setting and changing the priority of the component carrier through radio resource control RRC signaling or medium access control MAC signaling.

[0135] 9. The method according to item 1, further comprising:

[0136] When there are overlapping downlink subframes among the multiple component carriers and there is a physical downlink shared channel PDSCH transmission on the overlapping downlink subframe, the base station and / or the user equipment determines the feedback timing of the physical uplink control channel PUCCH signal corresponding to the component carrier on which the PDSCH transmission exists in the overlapping downlink subframe according to one of the following principles:

[0137] feedback timing of a component carrier with the highest priority among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists in the overlapped downlink subframe;

[0138] feedback timing of a component carrier having a minimum feedback delay among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists in the overlapped downlink subframe;

[0139] Feedback timing of the primary scheduling component carrier during cross-carrier scheduling; and

[0140] The overlapped downlink subframe has a feedback timing of the component carrier itself for the PDSCH transmission.

[0141] 10. The method according to 9, wherein, in the case where the feedback timing of the PUCCH signal is determined based on the feedback timing of the component carrier with the highest priority or the feedback timing of the component carrier with the lowest feedback delay,

[0142] If the obtained delay gain or uplink transmit power gain is lower than a predetermined threshold and causes the number of downlink subframes associated with the uplink subframe used to transmit the PUCCH signal of the component carrier to increase and exceed two, the feedback timing of the component carrier itself on which the PDSCH transmission exists on the overlapping downlink subframe is selected as the feedback timing of the PUCCH signal.

[0143] 11. The method according to 9 or 10, wherein the base station selects one of the following as the scheduling timing of the physical uplink shared channel PUSCH signal of the component carrier corresponding to the overlapping downlink subframe on the overlapping downlink subframe:

[0144] feedback timing of the PUCCH signal of the component carrier; and

[0145] The scheduling timing of the PUSCH signal of the current component carrier.

[0146] 12. A method according to claim 9, wherein the base station determines the principle of feedback timing of the PUCCH signal based on at least one of the delay requirement of the downlink signal, the energy saving requirement of the user equipment and the implementation complexity.

[0147] 13. The method according to 9, further comprising:

[0148] The base station notifies the user equipment of a determination principle of the feedback timing of the PUCCH signal to be followed by the component carrier through radio resource control RRC signaling or medium access control MAC signaling.

[0149] 14. A method according to 1 or 9, wherein, when it is necessary to dynamically adjust the PUCCH feedback carrier and / or PUCCH feedback timing of the component carrier for PDSCH transmission on the overlapping downlink subframe, the redundant or newly added bit information of the downlink control information DCI scheduled by the physical downlink shared channel PDSCH is used to dynamically specify the PUCCH feedback carrier on the overlapping downlink subframe and / or the feedback timing of the PUCCH signal corresponding to the PDSCH transmission of the component carrier.

[0150] 15. A base station for performing wireless communication in a wireless communication system, the wireless communication system comprising the base station and a user equipment, the user equipment communicating with the base station through multiple component carriers in a carrier aggregation manner, the base station comprising:

[0151] A priority allocation unit, configured to allocate a priority to each component carrier based on at least one of the following rules, so that the user equipment selects a component carrier with the highest priority to transmit an uplink signal in an overlapping uplink subframe:

[0152] an expected power loss for transmitting the uplink signal on the component carrier;

[0153] a burden of transmitting the uplink signal on the component carrier;

[0154] The number of uplink subframes of the component carrier; and

[0155] The primary and secondary attributes of a component carrier that transmits a downlink signal corresponding to the uplink signal transmitted on the component carrier.

[0156] 16. The base station according to 15, wherein the uplink signal comprises at least one of a physical uplink control channel PUCCH signal and a physical uplink shared channel PUSCH signal, and / or

[0157] The base station includes at least one of a macro base station and a low power node.

[0158] 17. The base station according to 15, wherein when the priority allocation unit allocates the priority based on the number of uplink subframes of the component carrier, the component carrier with a larger number of uplink subframes has a higher priority.

[0159] 18. A base station according to 15, wherein, when the priority allocation unit allocates the priority based on the primary and secondary attributes of the component carrier transmitting the downlink signal, if the component carrier transmitting the downlink signal is the primary component carrier, the corresponding component carrier transmitting the uplink signal has a higher priority.

[0160] 19. The base station according to 15, wherein when the priority allocation unit allocates the priority based on the burden of transmitting the uplink signal on the component carrier, a component carrier that provides a larger coverage area and / or serves more user equipments has a lower priority.

[0161] 20. The base station according to 15, wherein when the priority allocation unit allocates the priority based on the expected power loss of transmitting the uplink signal on the component carrier, a component carrier with a lower expected power loss has a higher priority.

[0162] 21. The base station according to 16, wherein the uplink signal is the PUCCH signal, and the PUCCH signal includes feedback information, and

[0163] The priority allocation unit further allocates the priority based on a feedback delay of a PUCCH signal of the component carrier.

[0164] 22. The base station according to 15, further comprising:

[0165] The transmission unit is used to notify the user equipment of the priority setting and change information of the component carrier through radio resource control RRC signaling or medium access control MAC signaling.

[0166] 23. The base station according to 15, further comprising:

[0167] A determining unit is configured to determine, when there are overlapping downlink subframes among the multiple component carriers and there is a physical downlink shared channel PDSCH transmission on the overlapping downlink subframes, a feedback timing of a physical uplink control channel PUCCH signal corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframes according to one of the following principles:

[0168] feedback timing of a component carrier with the highest priority among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists in the overlapped downlink subframe;

[0169] feedback timing of a component carrier having a minimum feedback delay among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists in the overlapped downlink subframe;

[0170] Feedback timing of the primary scheduling component carrier during cross-carrier scheduling; and

[0171] The overlapped downlink subframe has a feedback timing of the component carrier itself for the PDSCH transmission.

[0172] 24. The base station according to 23, wherein, when the determining unit determines the feedback timing of the PUCCH signal based on the feedback timing of the component carrier with the highest priority or the feedback timing of the component carrier with the lowest feedback delay,

[0173] If the obtained delay gain or uplink transmission power gain is lower than a predetermined threshold and causes the number of downlink subframes associated with the uplink subframe used to transmit the PUCCH signal of the component carrier to increase and exceed two, the determination unit selects the feedback timing of the component carrier itself on which the PDSCH transmission exists in the overlapping downlink subframe as the feedback timing of the PUCCH signal.

[0174] 25. The base station according to 23 or 24, wherein the determining unit selects one of the following as the scheduling timing of the physical uplink shared channel PUSCH signal of the component carrier corresponding to the overlapping downlink subframe on the overlapping downlink subframe:

[0175] feedback timing of the PUCCH signal of the component carrier; and

[0176] The scheduling timing of the PUSCH signal of the current component carrier.

[0177] 26. A base station according to 23, wherein the determination unit determines the principle of the feedback timing of the PUCCH signal based on at least one of the delay requirement of the downlink signal, the energy saving requirement of the user equipment and the implementation complexity.

[0178] 27. The base station according to 23, further comprising:

[0179] A notification unit is used to notify the user equipment of a determination principle of the feedback timing of the PUCCH signal to be followed by the component carrier through radio resource control RRC signaling or medium access control MAC signaling.

[0180] 28. The base station according to 15 or 23, further comprising:

[0181] A designation unit is used to dynamically designate the PUCCH feedback carrier on the overlapping downlink subframe and / or the PUCCH feedback timing corresponding to the PDSCH transmission of the component carrier on the overlapping downlink subframe by utilizing redundant or newly added bit information of the downlink control information DCI scheduled by the physical downlink shared channel PDSCH when it is necessary to dynamically adjust the PUCCH feedback carrier and / or the PUCCH feedback timing of the component carrier for PDSCH transmission on the overlapping downlink subframe.

[0182] 29. A user equipment for performing wireless communication in a wireless communication system, the wireless communication system comprising the base station according to any one of 15 to 28 and the user equipment, the user equipment communicating with the base station through multiple component carriers in a carrier aggregation manner, the user equipment comprising:

[0183] A receiving unit, configured to receive priority setting and change information of the component carrier transmitted by the base station, and information related to a determination principle of a feedback timing of a physical uplink control channel PUCCH signal;

[0184] a selecting unit, configured to select a component carrier with the highest priority among the aggregated carriers where uplink subframes overlap, and select a feedback timing of a PUCCH signal and a scheduling timing of a physical uplink shared channel PUSCH signal according to the feedback timing determination principle among the aggregated carriers where downlink subframes overlap; and

[0185] A transmission unit, used to transmit an uplink signal via the component carrier selected by the selection unit, the feedback timing of the PUCCH signal and the scheduling timing of the PUSCH signal, or used to transmit an uplink signal according to the component carrier dynamically indicated by the downlink control information DCI signaling in the overlapping downlink subframe, the feedback timing of the PUCCH signal and the scheduling timing of the PUSCH signal.

[0186] In the system and method of the present disclosure, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present disclosure. In addition, the steps of performing the above series of processes can naturally be performed in chronological order according to the order of description, but do not necessarily need to be performed in chronological order. Some steps can be performed in parallel or independently of each other.

[0187] Although the embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings, it should be understood that the embodiments described above are only used to illustrate the present disclosure and do not constitute a limitation of the present disclosure. For those skilled in the art, various modifications and changes can be made to the above embodiments without departing from the essence and scope of the present disclosure. Therefore, the scope of the present disclosure is limited only by the attached claims and their equivalent meanings.

Claims

1. An electronic device for a user device, comprising: A processor and a memory, wherein the memory stores instructions, and the processor is configured to execute the instructions stored in the memory to perform: Directly communicate with a base station in a carrier aggregation manner, wherein directly communicating with a base station includes: directly communicating with the base station on a primary component carrier and directly communicating with the base station on at least one secondary component carrier, and wherein the carrier aggregation includes carrier aggregation of time division duplex of different uplink and downlink configurations or carrier aggregation between frequency division duplex and time division duplex; Based on the configuration information from the base station, in addition to configuring a physical uplink control channel PUCCH on the primary component carrier, further configuring a PUCCH on a secondary component carrier of the at least one secondary component carrier; When there are overlapping downlink subframes between the primary component carrier and the at least one secondary component carrier and there is a physical downlink shared channel PDSCH transmission on the overlapping downlink subframe, receiving a feedback timing of a PUCCH signal corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframe, determined by the base station according to the following feedback timing: feedback timing of a component carrier with the highest priority among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframe; and In response to the downlink transmission, a hybrid automatic repeat request HARQ feedback is conducted on the PUCCH of the feedback component carrier, The feedback component carrier and the feedback timing are dynamically indicated by downlink control information DCI signaling for PDSCH scheduling in the overlapping downlink subframe. The processor is configured to obtain the configuration information from a radio resource control signaling from the base station, The processor is configured to: conduct a PUCCH signal of HARQ feedback corresponding to PDSCH transmission according to the feedback component carrier.

2. The electronic device according to claim 1, wherein: The component carrier with the highest priority among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists in the overlapping downlink subframe is the component carrier with the shortest HARQ feedback delay.

3. The electronic device according to claim 1, wherein: The configuration information includes a priority for each secondary component carrier, the priority being based on at least one of: an expected power loss for transmissions on the secondary component carrier; an uplink transmission load on the secondary component carrier; The number of uplink subframes of the secondary component carrier; and A HARQ feedback delay on the secondary component carrier.

4. The electronic device according to any one of claims 1 to 3, wherein: The electronic device is implemented as a user equipment in an LTE system.

5. An electronic device for a base station, comprising: A processor and a memory, wherein the memory stores instructions, and the processor is configured to execute the instructions stored in the memory to perform: Directly communicating with a user equipment in a carrier aggregation manner, wherein directly communicating with the user equipment includes: directly communicating with the user equipment on a primary component carrier and directly communicating with the user equipment on at least one secondary component carrier, and wherein the carrier aggregation includes carrier aggregation of time division duplex of different uplink and downlink configurations or carrier aggregation between frequency division duplex and time division duplex; generating configuration information for the user equipment to configure a physical uplink control channel (PUCCH) on a secondary component carrier of the at least one secondary component carrier in addition to configuring the PUCCH on the primary component carrier; When there are overlapping downlink subframes among the primary component carrier and the at least one secondary component carrier and there is a physical downlink shared channel PDSCH transmission on the overlapping downlink subframe, determining the feedback timing of the PUCCH signal corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframe according to the following feedback timing: feedback timing of a component carrier with the highest priority among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframe; and Acquire a hybrid automatic repeat request HARQ feedback corresponding to downlink transmission on a PUCCH of a feedback component carrier from the user equipment, The processor is configured to include the configuration information in radio resource control signaling, The processor is configured to: dynamically indicate the feedback component carrier and the feedback timing by using downlink control information DCI signaling for PDSCH scheduling of overlapping downlink subframes, The feedback component carrier is used to transmit a PUCCH signal of HARQ feedback corresponding to PDSCH transmission.

6. The electronic device according to claim 5, wherein: The component carrier with the highest priority among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists in the overlapping downlink subframe is the component carrier with the shortest HARQ feedback delay.

7. The electronic device according to claim 5, wherein: The configuration information includes a priority for each secondary component carrier, the priority being based on at least one of: an expected power loss for transmissions on the secondary component carrier; an uplink transmission load on the secondary component carrier; The number of uplink subframes of the secondary component carrier; and A HARQ feedback delay on the secondary component carrier.

8. A communication method for a user equipment, comprising: Directly communicate with a base station in a carrier aggregation manner, wherein directly communicating with a base station includes: directly communicating with the base station on a primary component carrier and directly communicating with the base station on at least one secondary component carrier, and wherein the carrier aggregation includes carrier aggregation of time division duplex of different uplink and downlink configurations or carrier aggregation between frequency division duplex and time division duplex; Based on the configuration information from the base station, in addition to configuring a physical uplink control channel PUCCH on the primary component carrier, further configuring a PUCCH on a secondary component carrier of the at least one secondary component carrier; When there are overlapping downlink subframes between the primary component carrier and the at least one secondary component carrier and there is a physical downlink shared channel PDSCH transmission on the overlapping downlink subframe, receiving a feedback timing of a PUCCH signal corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframe, determined by the base station according to the following feedback timing: feedback timing of a component carrier with the highest priority among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframe; and In response to the downlink transmission, a hybrid automatic repeat request HARQ feedback is conducted on the PUCCH of the feedback component carrier, The feedback component carrier and the feedback timing are dynamically indicated by downlink control information DCI signaling for PDSCH scheduling in the overlapping downlink subframe. The communication method further comprises: acquiring the configuration information from a radio resource control signaling from the base station, The communication method further includes: transmitting a PUCCH signal of HARQ feedback corresponding to PDSCH transmission according to the feedback component carrier.

9. A communication method for a base station, comprising: Directly communicating with a user equipment in a carrier aggregation manner, wherein directly communicating with the user equipment includes: directly communicating with the user equipment on a primary component carrier and directly communicating with the user equipment on at least one secondary component carrier, and wherein the carrier aggregation includes carrier aggregation of time division duplex of different uplink and downlink configurations or carrier aggregation between frequency division duplex and time division duplex; generating configuration information for the user equipment to configure a physical uplink control channel (PUCCH) on a secondary component carrier of the at least one secondary component carrier in addition to configuring the PUCCH on the primary component carrier; When there are overlapping downlink subframes among the primary component carrier and the at least one secondary component carrier and there is a physical downlink shared channel PDSCH transmission on the overlapping downlink subframe, determining the feedback timing of the PUCCH signal corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframe according to the following feedback timing: feedback timing of a component carrier with the highest priority among the uplink component carriers corresponding to the component carrier on which the PDSCH transmission exists on the overlapping downlink subframe; and Acquire a hybrid automatic repeat request HARQ feedback corresponding to downlink transmission on a PUCCH of a feedback component carrier from the user equipment, The configuration information is included in the radio resource control signaling, and The communication method further includes: dynamically indicating the feedback component carrier and the feedback timing by using downlink control information DCI signaling for PDSCH scheduling of overlapping downlink subframes, The feedback component carrier is used to transmit a PUCCH signal of HARQ feedback corresponding to PDSCH transmission.

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