Wireless communication device and wireless communication method for interference management in SBFD operation

Abstract

The invention discloses a wireless communication method for interference management in SBFD operation. The wireless communication method comprises self-interference of a base station, interference in sub-bands of a same channel of the base station and UE side and interference between sub-bands of the same channel. Self-interference of a base station is managed by configuring a number of UL sub-bands in a DL / flexible slot / symbol or a number of DL sub-bands in a UL / flexible slot / symbol in an outer carrier or an edge RB within a TDD sub-band, and / or performing beam isolation of the UL sub-bands and the DL sub-bands, including allocating different beams to different sub-bands. In-channel intra-subband interference and inter-subband interference are managed by configuring the same number of subbands, similar bandwidth and similar subband allocation between neighboring base stations and UEs, and / or performing beam isolation of UL subbands and DL subbands, including allocating different beams to different subbands between neighboring base stations.

Description

Technical Field

[0001] The present application relates to the field of wireless communication systems, and more specifically, to a wireless communication device and a wireless communication method for interference management in sub-band full-duplex (SBFD) operation in a 5G NR (New Radio) communication system. More specifically, the present application analyzes the interference generated in a 5G system (such as gNB and user equipment (UE)) due to SBFD operation, and discusses a variety of solutions and solutions for managing / mitigating SBFD specific interference. Background Art

[0002] In the prior art, most companies analyzed the various types of interference caused by SBFD operation and suggested to RAN1 to further study the application of Rel-16 dynamic time division duplex (TDD) cross link interference (CLI) mitigation solution in SBFD interference. However, SBFD operation introduces new interference in the system (such as gNB and UE), and certain scenarios that may cause interference in SBFD operation are not identified. In addition, although SBFD interference was discussed in the 3GPP RAN1#109-e meeting, there are still many SBFD interference scenarios that have not been identified, especially in the case of intra-subband interference. In addition, in terms of SBFD interference management, no clear solution or solution has been proposed that can specifically address the interference mitigation / management caused by SBFD operation.

[0003] Therefore, there is a need for a wireless communication device and a wireless communication method for interference management in SBFD operation. Summary of the invention

[0004] The purpose of the present application is to propose a wireless communication device and a wireless communication method for interference management in sub-band full-duplex (SBFD) operation to solve the problems in the prior art, provide analysis of specific interference in SBFD operation, provide analysis of scenarios that may cause interference, provide solutions for interference management / mitigation, provide good communication performance, and / or provide high reliability.

[0005] In the first aspect of the present application, a wireless communication method for interference management for sub-band full-duplex (SBFD) operation is performed by a base station, characterized in that the base station manages the self-interference of the base station by configuring the configured number of downlink (DL) / flexible (F) time slots / symbols or the configured number of DL subbands in UL / F time slots / symbols in an outer carrier or edge resource block (RB) in a time division duplex (TDD) subband, and / or performing beam isolation of the (UL) subband and the DL subband, including assigning different beams to different subbands.

[0006] In a second aspect of the present application, a wireless communication method for interference management in sub-band full-duplex (SBFD) operation by neighboring base stations includes: the neighboring base stations manage the co-channel sub-band interference between neighboring base stations by at least one or all of the following operations: maintaining the same bandwidth of UL to UL subband and DL to DL subband between neighboring base stations; allocating similar subbands to UL transmission and DL transmission between neighboring base stations; allocating a similar number of subbands to DL transmission and UL transmission between neighboring base stations; and / or configuring the same number of subbands between neighboring base stations.

[0007] In the third aspect of the present application, a wireless communication method for interference management in sub-band full-duplex (SBFD) operation by a neighboring base station includes: the neighboring base station manages co-channel inter-subband interference by performing beam isolation of UL subband and DL subband (including assigning different beams to different subbands).

[0008] In a fourth aspect of the present application, a base station includes: a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to manage the self-interference of the base station by configuring the number of configured downlink (DL) / uplink (UL) subbands in flexible (F) time slots / symbols or the number of configured DL subbands in UL / F time slots / symbols in an outer carrier or edge resource block (RB) within a time division duplex (TDD) subband, and / or performing beam isolation of UL subbands and DL subbands, including assigning different beams to different subbands.

[0009] In a fifth aspect of the present application, a non-transitory machine-readable storage medium stores instructions thereon, and when a computer executes the instructions, the instructions cause the computer to execute the above method.

[0010] In a sixth aspect of the present application, a chip includes a processor configured to call and run a computer program stored in a memory so that a device equipped with the chip executes the above method.

[0011] In a seventh aspect of the present application, a computer-readable storage medium stores a computer program, wherein the computer program enables a computer to execute the above method.

[0012] In an eighth aspect of the present application, a computer program product comprises a computer program, wherein the computer program enables a computer to execute the above method.

[0013] In a ninth aspect of the present application, a computer program is provided, wherein the computer program enables a computer to execute the above method. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or related technologies, the following briefly introduces the drawings to be described in the embodiments. Obviously, the drawings are only some embodiments of the present application, and ordinary technicians in this field can obtain other drawings based on these drawings without paying any price.

[0015] Figure 1 It is a block diagram of a base station (e.g., gNB) in a communication network system according to an embodiment of the present application.

[0016] Figure 2 The invention is a flowchart of a wireless communication method for interference management in sub-band full-duplex (SBFD) operation performed by a base station according to an embodiment of the present application.

[0017] Figure 3 It is a schematic diagram illustrating an example of gNB self-interference according to an embodiment of the present application.

[0018] Figure 4 It is a schematic diagram illustrating reducing gNB self-interference by configuring sub-bands in lower RBs according to an embodiment of the present application.

[0019] Figure 5 It is a schematic diagram illustrating reducing gNB self-interference by configuring sub-bands in higher RBs according to an embodiment of the present application.

[0020] Figure 6 It is a schematic diagram illustrating reducing gNB self-interference by reducing the number of subbands within the TDD band according to an embodiment of the present application.

[0021] Figure 7 It is a schematic diagram illustrating an example of allocating different beams to different subbands according to an embodiment of the present application.

[0022] Figure 8 It is a schematic diagram illustrating intra-channel sub-band interference between gNBs due to different bandwidths according to an embodiment of the present application.

[0023] Fig. 9 It is a schematic diagram illustrating intra-subband interference in the same channel between gNBs due to different subbands according to an embodiment of the present application.

[0024] Fig.10 It is a schematic diagram illustrating intra-subband interference in the same channel between gNBs caused by different subband allocations according to an embodiment of the present application.

[0025] Fig.11 It is a schematic diagram illustrating intra-co-channel sub-band interference between gNBs due to different numbers of sub-bands according to an embodiment of the present application.

[0026] Fig.12 It is a schematic diagram illustrating the intra-channel sub-band interference management between gNBs and gNBs between adjacent gNBs according to an embodiment of the present application.

[0027] Fig.13 It is a schematic diagram illustrating the cross-cell co-channel sub-band interference between gNBs according to an embodiment of the present application.

[0028] Fig.14 It is a schematic diagram illustrating an example of alleviating inter-subband interference through beamforming according to an embodiment of the present application.

[0029] Fig.15 It is a schematic diagram illustrating the interference between co-channel sub-bands within a cell between UEs according to an embodiment of the present application.

[0030] Fig.16 It is a schematic diagram illustrating an example of alleviating intra-cell interference between UEs by configuring UL subbands in lower RBs according to an embodiment of the present application.

[0031] Fig.17 It is a schematic diagram illustrating an example of alleviating intra-cell interference between UEs by configuring UL subbands in higher RBs according to an embodiment of the present application.

[0032] Fig.18 It is a schematic diagram illustrating an example of a solution for alleviating intra-cell inter-subband interference between UEs by reducing the number of subbands according to an embodiment of the present application.

[0033] Fig.19It is a schematic diagram illustrating an example of a solution for alleviating intra-cell inter-subband interference between UEs through beam isolation according to an embodiment of the present application.

[0034] Fig. 20 It is a schematic diagram illustrating cross-cell co-channel sub-band interference between UEs due to different bandwidths according to an embodiment of the present application.

[0035] Fig.21 It is a schematic diagram illustrating intra-subband interference between UEs in the same channel across cells caused by different subbands according to an embodiment of the present application.

[0036] Fig. 22 It is a schematic diagram illustrating cross-cell co-channel intra-subband interference between UEs caused by different numbers of subbands according to an embodiment of the present application.

[0037] Fig.23 It is a schematic diagram illustrating cross-cell co-channel intra-subband interference between UEs caused by different numbers of subbands according to an embodiment of the present application.

[0038] Fig.24 It is a schematic diagram illustrating an example of a solution for cross-cell co-channel sub-band interference between UEs according to an embodiment of the present application.

[0039] Fig.25 It is a schematic diagram illustrating the cross-cell co-channel sub-band interference between UEs according to an embodiment of the present application.

[0040] Fig.26 It is a schematic diagram illustrating an example of a solution for resolving intra-subband interference between UEs across the same channel by beam isolation according to an embodiment of the present application.

[0041] Fig. 27 is a block diagram of a wireless communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] The technical content, structural features, objectives and effects of the present application are described in detail below in conjunction with the accompanying drawings. Specifically, the terms in the embodiments of the present application are only used to describe the purpose of specific embodiments, and are not intended to limit the present application.

[0043] The diverse usage scenarios and exponential growth in the number of user equipment (UE) in next-generation wireless communication systems have led to an explosive growth in data traffic, which has put forward higher requirements for spectrum efficiency. To meet these requirements, time division duplex (TDD) systems are widely used in commercial NR deployments. TDD systems use a single spectrum (frequency band) for downlink (DL) and uplink (UL) communications in different time slots, making more efficient use of the available spectrum compared to frequency division duplex (FDD) systems.

[0044] In a traditional TDD system, time domain resources are allocated between downlink (DL), uplink (UL), and flexible symbols, where flexible symbols can be used as a guard period for DL, UL, or DL-UL switching. Limited time allocation for uplink in traditional TDD leads to reduced coverage, increased latency, and reduced capacity. To overcome these limitations, the 3GPP RAN working group approved a study project in Rel-18 to focus on the feasibility of simultaneous DL and UL operation within the traditional TDD band, i.e., full-duplex or more specifically sub-band non-overlapping full-duplex (SBFD) operation, and proposed the following potential improvements: Study sub-band non-overlapping full-duplex and potential enhancements for dynamic / flexible TDD (RAN1, RAN4).

[0045] In SBFD operation, the gNB operates in full-duplex mode, that is, DL and UL transmissions are performed simultaneously on the gNB side, while the UE operates in traditional half-duplex mode. This simultaneous DL and UL transmission on the gNB side will cause interference to the system (gNB and UE), which may degrade the performance of SBFD operation. In order to reduce the impact of SBFD interference on the system, it is necessary to identify the causes of SBFD-specific interference in the system and further study its management / mitigation solutions. In addition, in the duplex evolution SID proposed in Rel-18, it is mentioned that SBFD-specific interference needs to be further studied and solutions determined, such as studying the cross-link interference (CLI) handling between gNBs and between UEs and determining management solutions, such as considering intra-subband CLI and inter-subband CLI in the case of subband non-overlapping full-duplex.

[0046] In addition, the interference generated by SBFD operation to the system (gNB and UE) will seriously affect the performance of gNB and UE. In order to mitigate the impact of SBFD interference, it is necessary to first identify the interference type and its source, as mentioned above. In this regard, a lot of discussions were held in the 3GPP RAN1#109-e meeting, focusing on identifying the factors that cause interference in SBFD operation. The 3GPP discussion reached a consensus and classified several types of SBFD interference, such as gNB self-interference, intra-subband interference and inter-subband interference, as follows: Co-channel intra-subband interference: interference caused by the interference source's transmission on a set of consecutive RBs in one carrier to the victim's reception on the same set of consecutive RBs in the same carrier. (Cross-cell) UE-UE co-channel intra-subband CLI: CLI caused by the interfering UE's UL transmission on a set of RBs in one carrier to the victim UE's DL reception on the same set of RBs in the same carrier. (Intra-cell / Cross-cell) UE-UE co-channel inter-subband CLI: CLI caused by the interfering UE's UL transmission on the first set of RBs in one carrier to the victim UE's DL reception on the second set of RBs in the same carrier with non-overlapping frequencies. UE-UE adjacent channel CLI: CLI caused by the UL transmission of an interfering UE on one carrier to the DL reception of a victim UE on another adjacent carrier.

[0047] Although SBFD interference was analyzed in detail in the 3GPP RAN1#109-e meeting, there are still some SBFD interference scenarios that are not identified in the above protocols, especially in the case of intra-subband interference. In addition, in terms of SBFD interference management, no clear solution or solution is proposed to specifically mitigate / manage the interference caused by SBFD operation. Therefore, some embodiments of the present application further study the detailed analysis of SBFD specific interference, the scenarios causing the interference, and its management / mitigation solutions.

[0048] Subband non-overlapping full-duplex can improve UL coverage, reduce latency, and increase capacity. However, due to the simultaneous DL and UL transmissions in the same time slot in SBFD operation, new interference is generated on the gNB and UE sides. These interferences may be caused by various scenarios and factors on the gNB side, thereby reducing the performance and system capacity of SBFD operation on the gNB and UE sides, as described below:

[0049] 1. gNB-to-gNB interference: a. gNB self-interference. b. Co-channel interference: i. Intra-subband interference. ii. Inter-subband interference. c. Adjacent channel interference: i. Intra-subband interference. ii. Inter-subband interference.

[0050] 2. UE-to-UE interference: a. Intra-cell interference: i. Inter-subband interference. b. Inter-cell interference: i. Intra-subband interference. ii. Inter-subband interference.

[0051] In addition, SBFD operation may also cause severe interference to conventional operation. Therefore, it is necessary to identify those scenarios that cause interference in SBFD operation and conventional operation and apply interference management / mitigation solutions to reduce its impact on both gNB and UE sides.

[0052] Figure 1 It is shown that according to one embodiment of the present application, base stations (e.g., gNBs) 10 and 20 for a communication network system 40. The communication network system 40 includes base stations 10 and 20 (e.g., a first base station 10 and one or more second base stations 20). The base station 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement the functions, processes, and / or methods described herein. The various layers of the wireless interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 and stores various information for operating the processor 11 or 21. The transceiver 13 or 23 is operatively coupled to the processor 11 or 21 for sending and / or receiving wireless signals.

[0053] The processor 11 or 21 may include an application specific integrated circuit (ASIC), other chipsets, logic circuits and / or data processing devices. The memory 12 or 22 may include a read-only memory (ROM), a random access memory (RAM), flash memory, a memory card, a storage medium and / or other storage devices. The transceiver 13 or 23 may include a baseband circuit for processing radio frequency signals. When these embodiments are implemented in software, the techniques described herein may be implemented by modules (e.g., procedures, functions, etc.), which may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be integrated in the processor 11 or 21, or may be configured externally, and communicate with the processor 11 or 21 in various known ways.

[0054] In some embodiments, the processor 11 or 21 is configured to manage the self-interference of the base station by configuring the number of configured downlink (DL) / flexible (F) time slots / symbols in the outer carrier or edge resource block (RB) within the time division duplex (TDD) subband, or the number of configured DL subbands in the UL / F time slot / symbol, and / or performing beam isolation of UL subbands and DL subbands (including assigning different beams to different subbands). This can solve the problems in the prior art, provide analysis of specific interference for SBFD operation, identify scenarios that cause interference, provide interference management / mitigation solutions, and ensure good communication performance and / or high reliability.

[0055] Figure 2 A wireless communication method 200 for interference management in sub-band full-duplex (SBFD) operation performed by a base station is shown, according to an embodiment of the present application. In some embodiments, the method 500 includes: step 202, the base station manages the self-interference of the base station by configuring the configured number of UL sub-bands in DL / F slots / symbols, or the configured number of DL sub-bands in UL / F slots / symbols in outer carriers or edge resource blocks (RBs) within a time division duplex (TDD) sub-band; and step 204, performing beam isolation of UL sub-bands and DL sub-bands, including assigning different beams to different sub-bands. This can solve the problems in the prior art, provide analysis of specific interference for SBFD operation, identify scenarios that cause interference, provide interference management / mitigation solutions, and ensure good communication performance and / or high reliability.

[0056] In some embodiments, the number of configured UL subbands in a DL / F slot / symbol or DL ​​subbands in a UL / F slot / symbol is two. In some embodiments, the first UL subband is aligned with the first DL subband, the second DL subband and the third DL subband are isolated from the first UL subband, and assigning different beams to different subbands includes assigning a first receive (Rx) beam to the first UL subband, and assigning a first transmit (Tx) beam and a second transmit (Tx) beam to the second DL subband and the third DL subband, respectively. In some embodiments, the wireless communication method further includes the base station indicating to a user equipment (UE) in the subband configuration the Rx beam assigned to the UL subband and the Tx beam assigned to the DL subband.

[0057] In some embodiments, the wireless communication method also includes the base station managing the co-channel sub-band interference between neighboring base stations by at least one or all of the following operations: maintaining the same bandwidth of UL to UL sub-band and DL to DL sub-band between neighboring base stations; allocating similar sub-bands to UL transmission and DL transmission between neighboring base stations; allocating a similar number of sub-bands for DL ​​transmission and UL transmission between neighboring base stations; and / or configuring the same number of sub-bands between neighboring base stations. In some embodiments, the neighboring base stations exchange SBFD-based auxiliary information via backhaul signaling (using an Xn interface) or over-the-air signaling (OTA), the information including sub-band bandwidth, number of sub-bands, and / or sub-band allocation to UL / DL transmission within a TDD frequency band.

[0058] In some embodiments, the wireless communication method further includes managing intra-cell inter-subband interference between UEs by configuring, by the base station, a configured number of UL subbands in a DL / F slot / symbol or a configured number of DL subbands in a UL / F slot / symbol on the UE, and / or performing beam isolation of UL subbands and DL subbands on the UE (including assigning different beams to different subbands on the UE). In some embodiments, the configured number of UL subbands in a DL / F slot / symbol or a configured number of DL subbands in a UL / F slot / symbol is two.

[0059] In some embodiments, the wireless communication method further includes the base station managing intra-cell co-channel sub-band interference between UEs by at least one or all of the following operations: maintaining the same bandwidth of UL to UL sub-bands and DL to DL sub-bands between UEs served by neighboring base stations; allocating similar sub-bands to UL transmission and DL transmission between UEs served by neighboring base stations; allocating a similar number of sub-bands to DL transmission and UL transmission between UEs served by neighboring base stations; and / or configuring the same number of sub-bands between UEs served by neighboring base stations. In some embodiments, the method further includes managing inter-cell co-channel sub-band interference between UEs by allocating different beams between DL sub-bands and UL sub-bands and setting isolation gaps.

[0060] Some embodiments of the present application discuss the sources and scenarios that lead to interference in SBFD operation, and propose interference management / mitigation solutions to reduce the impact of SBFD-specific interference on the gNB and UE sides. Some embodiments analyze the sources of interference caused by SBFD operation and its management / mitigation solutions on the gNB side. Some embodiments analyze the sources of interference caused by SBFD operation and its management / mitigation solutions on the UE side.

[0061] SBFD interference analysis and interference management solutions at gNB:

[0062] gNB self-interference:

[0063] In SBFD operation, gNB self-interference (SI) is caused by the transmission of DL subbands on a set of DL resource blocks (RBs) within the same gNB to the reception of UL subbands on a set of UL resource blocks (RBs) of non-overlapping frequencies in the same carrier, which is defined in the 3GPP RAN1#109-e meeting agreement. In other words, gNB self-interference is caused by the DL subband transmissions on the UL subband receptions in the same gNB. Several existing gNB self-interference mitigation schemes, such as transmit / receive isolation, spatial domain isolation, and advanced receivers, were proposed in the 3GPP RAN1#109-e meeting. However, most of these solutions focus on hardware enhancement, which may significantly increase the hardware cost.

[0064] Therefore, embodiments of the present application propose several more cost-effective solutions based on subband carrier or RB configuration and beam isolation to reduce the impact of gNB self-interference.

[0065] Figure 3 An example is shown where the UL subband is configured to be located in the inner RB of the TDD band in the DL / F slot / symbol. This configuration will cause double self-interference at the gNB, such as interference from the DL subband of the upper RB to the UL subband of the inner RB (self-interference 1), and interference from the DL subband of the lower RB to the UL subband of the inner RB (self-interference 2), as shown in Figure 3 In other words, this configuration will generate double the self-interference at the gNB.

[0066] In order to reduce the impact of dual interference, the embodiments of the present application propose to configure UL subbands in DL / F time slots / symbols or DL ​​subbands in UL / F time slots / symbols by utilizing edge carriers or RBs in TDD subbands. For example, configuring UL subbands in lower layer RBs in DL / F time slots / symbols will generate unilateral interference (interference 1), such as Figure 4 In addition, the upper RB configuration UL subband in the DL / F time slot / symbol can also be used to reduce the impact of double interference, for example, it will only generate single interference (self-interference 1), as shown in Figure 5 In addition, reducing the number of subbands in the TDD band can also help reduce the impact of gNB self-interference. For example, two subbands in the TDD band will reduce the double interference to a single self-interference of the gNB, as shown in Figure 6 In summary, by configuring the UL subband in the edge carrier or RB in the DL / F time slot / symbol and reducing the number of subbands, the gNB self-interference can be reduced.

[0067] In another embodiment, to further reduce the impact of gNB self-interference, beam isolation of DL and UL subbands can be used, such as assigning different beams to different subbands. For example, the gNB can assign receive beam n to UL subband #1, and assign transmit beams n and n+1 to DL subbands 2 and 3, respectively. Figure 7 As shown. In addition, the gNB can indicate to the UE the transmit and receive beams assigned to the UL and DL subbands in the subband configuration. In addition, the gNB can isolate the UL and DL beams as much as possible to isolate UL and DL transmissions and reduce gNB self-interference. This example method may be more effective in FR2 (frequency range 2).

[0068] Co-channel interference between gNBs:

[0069] Co-channel interference between gNBs is interference caused by the interference source gNB to the victim gNB reception in the same carrier. In other words, when two gNBs use the same channel in the TDD frequency band, interference from the interference source gNB to the victim gNB occurs. Some embodiments of the present application analyze co-channel intra-subband and inter-subband interference, and propose solutions for their management / mitigation through some example scenarios.

[0070] Interference between gNB and gNB in ​​the same channel sub-band:

[0071] Co-channel intra-subband interference between gNBs is caused by the transmission of the interferer gNB on a set of consecutive RBs in a carrier to the reception of the victim gNB on the same set of consecutive RBs in the same carrier. Co-channel intra-subband interference occurs when two neighboring gNBs have different configuration parameters in the following aspects: 1. The bandwidth of the UL to UL and DL to DL subbands between neighboring gNBs is different. 2. The subband allocation for UL and DL transmissions between neighboring gNBs is different. 3. The number of subbands allocated for UL and DL transmissions between neighboring gNBs is different. 4. The number of subbands configured between neighboring gNBs is different.

[0072] This embodiment explains the co-channel sub-band interference between gNBs caused by the above reasons.

[0073] Scenario 1: Different UL-to-UL and DL-to-DL subband bandwidths between neighboring gNBs

[0074] In this case, when two neighboring gNBs are configured with different bandwidths for the UL subbands in the DL / F slots / symbols. For example, consider two gNBs where the bandwidth of the UL subband configured by gNB1 is different from the bandwidth of the UL subband configured by gNB2 in the DL / F slots / symbols, such as Figure 8 In this case, the interference caused by gNB1’s DL subband transmission to gNB2’s UL subband reception comes from the same set of consecutive RBs, as shown in Figure 8 shown.

[0075] Scenario 2: Different subbands are allocated for DL ​​and UL transmission between neighboring gNBs

[0076] In this case, co-channel gNB-to-gNB intra-subband interference occurs when neighboring gNBs are configured in a way that results in different subbands being allocated for UL subbands in DL / F slots / symbols. For example, consider two gNBs, where gNB1 allocates subband #1 as UL subband in DL / F slots / symbols, and gNB2 allocates subband #2 as UL subband in DL / F slots / symbols, such as Fig. 9As shown in Figure 2, in this case, DL subband #2 of gNB1 will cause intra-subband interference to UL subband #2 of gNB2, and DL subband #1 of gNB2 will cause intra-subband interference to UL subband #1 of gNB1. Therefore, in this case, gNB1 and gNB2 will act as both the aggressor and victim of interference.

[0077] Scenario 3: Different number of subbands allocated for DL ​​and UL transmission between neighboring gNBs

[0078] In this case, co-channel gNB-gNB intra-subband interference occurs when two gNBs are configured with the same number of subbands, but the neighboring gNB allocates different numbers of subbands for UL and DL transmissions. For example, consider two gNBs, where gNB1 and gNB2 are configured with 3 subbands each. gNB1 allocates subband #1 as UL subband in DL / F slot / symbol, while gNB2 allocates subband #1 and subband #2 as UL subbands in DL / F slot / symbol, as shown in Figure 2. Fig.10 In this case, the RB set of DL subband #2 of gNB1 will cause intra-subband interference to the same RB set of UL subband #2 of gNB2, as shown in Fig.10 shown.

[0079] Scenario 4: Different numbers of subbands are configured between adjacent gNBs

[0080] In this case, when neighboring gNBs are configured with different numbers of subbands, co-channel gNB-to-gNB intra-subband interference will occur. For example, consider two gNBs, where gNB1 is configured with 3 subbands and gNB2 is configured with 2 subbands. gNB1 and gNB2 allocate subband #1 as UL subband in DL / F slots / symbols, such as Fig.11 As shown in Figure 2, due to the different number of subbands, some RBs of DL subband #2 of gNB1 will cause intra-subband interference to the same set of RBs of UL subband #1 of gNB2, as shown in Figure 2. Fig.11 shown.

[0081] Solutions for managing intra-subband interference between gNBs:

[0082] In order to manage / mitigate the co-channel sub-band interference between gNBs, the embodiments of the present application propose the following four gNB-side solutions, and Fig.12 1. Maintain the same bandwidth for UL to UL and DL to DL subbands between neighboring gNBs. 2. Allocate the same subbands for UL and DL transmissions between neighboring gNBs. 3. Allocate a similar number of subbands for UL and DL transmissions between neighboring gNBs. 4. Configure the same number of subbands between neighboring gNBs.

[0083] Information exchange between gNBs:

[0084] In order to adopt the above solution and avoid intra-subband interference, coordination similar to the UL / DL slot format information exchange in Rel-16 is required between neighboring gNBs. In this method, neighboring gNBs exchange SBFD assistance information through backhaul signaling or over-the-air (OTA) signaling using the Xn interface, where the SBFD assistance information may include the bandwidth of the subband, the number of subbands, and the allocation of subbands to UL / DL transmission. Based on the information exchange, the neighboring gNBs can adopt the above solution points to avoid intra-subband interference.

[0085] Inter-subband interference between gNB and gNB:

[0086] The co-channel inter-subband interference between gNBs is caused by the transmission of the interfering gNB on a first set of consecutive RBs in a carrier to the reception of the victim gNB on a second set of consecutive RBs in the same carrier, where the two sets of consecutive RBs do not overlap in frequency, as described in the above protocol. In other words, the co-channel inter-subband interference between gNBs is caused by a set of consecutive RBs in a subband of one gNB to a set of RBs in a subband of another gNB. For example, Fig.13 As shown, DL subband #2 of gNB1 causes inter-subband interference to UL subband #1 of gNB2. Similarly, DL subband #2 of gNB2 causes inter-subband interference to UL subband #1 of gNB1.

[0087] In order to reduce the impact of inter-subband interference, various solutions have been proposed in the prior art, such as Tx / Rx isolation, spatial domain isolation, and guard band, etc. However, these solutions mainly focus on hardware enhancement, which will increase hardware costs.

[0088] Therefore, embodiments of the present application propose DL and UL subband solutions based on beam isolation to reduce the impact of inter-subband interference. In these solutions, neighboring gNBs can allocate different beams for DL ​​and UL subbands and set possible isolation gaps between DL and UL subbands. For example, two neighboring gNBs can allocate receive beam n to UL subband #1 and transmit beams n and n+1 to DL subbands 2 and 3, respectively. Fig.14 As shown, the transmit and receive beams of each gNB can be different from each other. In addition, the gNB can indicate the transmit and receive beams assigned to the UL and DL subbands to the UE in the subband configuration. In addition, gNB1 and gNB2 can isolate the UL and DL beams as much as possible to separate UL and DL transmissions and reduce interference. This example method is more effective in FR2.

[0089] SBFD interference analysis and UE interference management solutions:

[0090] In SBFD operation, simultaneous transmissions on the gNB side will also cause interference between UEs in the same cell or across cells. The embodiments of the present application analyze the cross-cell interference and intra-cell interference between UEs caused by SBFD operation through some example scenarios, and propose management / mitigation solutions. It should be noted that the SBFD interference management / mitigation solution proposed in the above embodiments can be used to reduce the impact of intra-cell and cross-cell interference between UEs, as described in the following embodiments.

[0091] Interference between UEs in a cell:

[0092] UE-to-UE intra-cell interference is caused by the UL transmission of the interfering UE on the first set of RBs in the carrier to the DL reception of the victim UE on the second set of RBs in the same cell, where the two sets of RBs do not overlap in frequency. In SBFD operation, UE-to-UE intra-cell interference may exist in the co-channel inter-subband scenario, as described below.

[0093] Inter-subband interference between UEs in the same channel within a cell:

[0094] The co-channel inter-subband interference between UEs is caused by the UL transmission of the interfering UE on a set of consecutive RBs in a carrier to the DL reception of the victim UE on a second set of consecutive RBs in the same carrier, such as Fig.15 In this embodiment, the management solution for avoiding or reducing gNB self-interference can be applied to manage the co-channel sub-band interference between UEs. For example, consider that a UL sub-band is configured in an inner RB of a TDD band in a DL / F slot / symbol, such as Fig.15 This configuration will cause intra-cell inter-subband interference between UEs on both sides of the gNB. For example, the internal RB transmission of UE2's UL subband #2 will interfere with the upper RB of UE1's DL subband #1 (interference 1), and the interference of UE2's UL subband #2 will interfere with the lower RB of UE1's DL subband #1 (interference 2). Fig.15 shown.

[0095] In order to reduce the impact of these two types of interference, the embodiments of the present application propose to configure the UL subband by using the edge carrier or RB in the TDD subband in the DL / F time slot / symbol. For example, configuring UE2's UL subband #1 in the lower layer RB in the DL / F time slot / symbol will cause unilateral interference (interference 1) to UE1, such as Fig.16 In addition, configuring UL subband #3 of UE3 in the upper layer RB in the DL / F time slot / symbol will cause unilateral interference to UE1, as shown in Fig.17In addition, reducing the number of subbands in the TDD band will also reduce the impact of intra-cell inter-subband interference between UEs. For example, two subbands in the TDD band will reduce the double interference of UE2 to UE1 to single self-interference, as shown in Fig.18 shown.

[0096] Similarly, the subband solution based on beam isolation discussed in the above embodiments can also reduce the intra-cell co-channel subband interference between UEs. For example, the gNB allocates receive beam n to UL subband #1 (used by UE2), and allocates transmit beams n and n+1 to DL subbands 2 and 3 (used by UE1), respectively. Fig.19 In addition, the gNB can indicate to the UE the transmit and receive beams allocated to the UL and DL subbands in the subband configuration. Since the UL and DL transmissions are isolated by beams, the impact of UE-to-UE interference between subbands within the cell can be reduced.

[0097] Cross-cell interference between UEs:

[0098] The cross-cell interference between UEs is caused by the UL transmission of the interfering UE on the first group of RBs in the carrier causing the DL reception of the victim UE on the same RB group or the second group of RBs in the neighboring cell. The embodiments of the present application explain the cross-cell interference between UEs through the following example scenarios and propose solutions.

[0099] Inter-cell co-channel sub-band interference between UEs:

[0100] UE-to-UE co-channel intra-subband interference is caused by the transmission of the interfering UE on a set of consecutive RBs in a carrier to the reception of the victim UE on the same set of consecutive RBs in the same carrier, as described in the above protocol. UE-to-UE cross-cell co-channel intra-subband interference occurs when UEs across cells are configured with different subband parameters (for example, the bandwidth of the subband is different, or the number of subbands in the TDD band is different, or the subbands allocated for UL or DL ​​transmission by the attacking UE and the victim UE across cells are different). This embodiment explains the cause of UE-to-UE cross-cell co-channel intra-subband interference through the following scenarios and proposes its solution. The interference management solution for gNB can be used to avoid UE-to-UE cross-cell co-channel intra-subband interference.

[0101] Scenario 1: Different UL-to-UL and DL-to-DL subband bandwidths are configured for UEs across cells

[0102] In this case, interference may occur when two neighboring gNBs configure different UL subband bandwidths in DL / F slots / symbols for their UEs. Fig. 20As shown in the figure, the DL and UL subband bandwidths configured by gNB1 for UE1 and UE2 in cell #1 are different from the DL and UL subband bandwidths configured by gNB2 for UE1 and UE2 in cell #2. In this case, the UL subband transmission of UE1 in cell #2 will cause interference to the DL subband transmission of UE2 in cell #1. Similarly, the UL subband transmission of UE1 in cell #1 will cause interference to the DL subband transmission of UE2 in cell #2.

[0103] Scenario 2: Allocating different subbands for DL ​​and UL transmissions of UEs across cells

[0104] In this case, when the neighboring gNB allocates different subbands to the UL subbands in the DL / F slots / symbols configured for its UEs, intra-subband interference between co-channel UEs across cells occurs. For example, gNB1 allocates subband #1 as the UL subband in the DL / F slots / symbols for UE2 in cell #1, and allocates subband #2 and subband #3 as DL subbands for UE1; while in cell #2, gNB2 allocates subband #2 as the UL subband for UE2, and allocates subband #1 and subband #3 as DL subbands for UE1. Fig.21 In this case, UL subband #2 of UE2 in cell #2 will cause intra-subband interference to DL subband #2 of UE1 in cell #1. Similarly, UL subband #1 of UE2 in cell #1 will cause intra-subband interference to DL subband #1 of UE1 in cell #2.

[0105] Scenario 3: Allocating different numbers of subbands for DL ​​and UL transmissions of UEs across cells

[0106] In this case, when neighboring gNBs allocate different numbers of subbands for UL and DL transmissions of their UEs, intra-subband interference between co-channel UEs across cells may occur. For example, gNB1 allocates UL subband #1 to UE2 in cell #1 and DL subband #2 and subband #3 to UE1; while gNB2 allocates UL subband #1 and subband #2 to UE2 in cell #2 and DL subband #3 to UE1. Fig. 22 In this case, the UL subband #2 of UE2 in cell #2 will cause intra-subband interference to the DL subband #2 of UE1 in cell #1, as shown in Fig. 22 shown.

[0107] Scenario 4: Configuring different numbers of subbands for UEs across cells

[0108] In this case, when neighboring gNBs configure different numbers of subbands for their UEs, intra-subband interference between co-channel UEs across cells may occur. For example, gNB1 configures 3 subbands for its UEs in cell #1 (e.g., UL subband #1 for UE2, DL subband #2 and subband #3 for UE1); while gNB2 configures 2 subbands for its UEs in cell #2 (e.g., UL subband #1 for UE2, DL subband #2 for UE1), as shown in Figure 2. Fig.23 In this case, some RBs of UL subband #1 in cell #2 will cause intra-subband interference to some RBs of DL subband #2 of UE1 in cell #1, such as Fig.23 shown.

[0109] UE-to-UE cross-cell sub-band interference management solution:

[0110] As mentioned above, the interference management solution for SBFD operation can be used to avoid interference between UEs. For cross-cell intra-subband interference management on the UE side, the same solution in the above embodiment can be used. However, the UE-to-UE intra-subband interference management solution can be performed by the gNB side. In other words, the four-point solution proposed in the above embodiment can be applied by the neighboring gNB to the UEs it serves, such as Fig.24 As shown: 1. The neighboring gNB shall maintain the same bandwidth of UL-to-UL and DL-to-DL subbands for its served UEs. 2. The neighboring gNB shall allocate the same subbands for UL and DL transmissions of its served UEs. 3. The neighboring gNB shall allocate a similar number of subbands for UL and DL transmissions of its served UEs. 4. The neighboring gNB shall configure the same number of subbands for its served UEs.

[0111] Inter-subband interference between UEs in the same channel across cells:

[0112] The inter-cell co-channel sub-band interference between UEs is caused by the UL transmission of the interfering UE on a set of continuous RBs in a carrier causing the DL reception of the victim UE on a second set of continuous RBs in the same carrier, where the two sets of continuous RBs do not overlap in frequency. Fig.25 As shown, UL subband #1 of UE2 in cell #1 will cause inter-subband interference to DL subband #2 of UE1 in cell #2. Similarly, UL subband #1 of UE2 in cell #2 will cause inter-subband interference to DL subband #2 of UE1 in cell #1.

[0113] In order to reduce the impact of inter-subband interference at the UE side, a beam isolation-based solution implemented by gNB can be used to reduce the inter-subband interference between UEs and co-channels across cells. In this solution, two gNBs can assign receive beam n to UL subband #1 and assign transmit beams n and n+1 to DL subbands 2 and 3, respectively. Fig.26As shown, the transmit and receive beams assigned to each UE can be different from other UEs across cells. In addition, the gNB can indicate the transmit and receive beams assigned to the UL and DL subbands to the UE in the subband configuration. In this way, UL transmission and DL reception in the same cell and across cells can be isolated, thereby reducing the impact of intra-cell and inter-cell subband interference between UEs.

[0114] In summary, some embodiments propose management solutions for interference caused by SBFD operation to improve the performance of SBFD operation. The proposed solutions are summarized as follows: 1. Various scenarios (especially intra-subband scenarios) that cause interference on the gNB and UE sides in SBFD operation are discussed. 2. Various interference management solutions are proposed to reduce the impact of interference in SBFD operation. 3. An inter-gNB coordination mechanism for SBFD operation is proposed, and the gNB exchanges auxiliary information of SBFD configuration with neighboring gNBs before SBFD-specific intra-subband interference occurs to avoid interference. 4. An interference management / mitigation solution based on beam isolation is proposed to reduce the impact of inter-subband interference and gNB self-interference. Some embodiments of the present application support UL / DL simultaneous transmission on the gNB side and have the following advantages: 1. Multiple interference scenarios and management solutions in SBFD operation are identified to improve the overall system capacity. 2. A cost-effectiveness-oriented solution is proposed to avoid the impact of interference before it occurs and make full use of the resources of sub-band full-duplex operation. 3. Alternative solutions for interference management are proposed, focusing on avoiding the need for hardware enhancement.

[0115] Fig. 27 7 is a block diagram of an exemplary wireless communication system 700 according to an embodiment of the present application. The embodiments described herein may be implemented into a system using any appropriately configured hardware and / or software. Fig. 27 A system 700 is shown, which includes a radio frequency (RF) circuit 710, a baseband circuit 720, an application circuit 730, a memory / storage device 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, which are coupled to each other at least as shown. The application circuit 730 may include circuits, such as but not limited to one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors, such as a graphics processor, an application processor. The processor may be coupled to a memory / storage device and configured to execute instructions stored in the memory / storage device to enable various applications and / or operating systems to run on the system.

[0116] While the present disclosure has been described in connection with what is considered to be the most practical and preferred embodiment, it is to be understood that the present disclosure is not limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

1. A wireless communication method for interference management for sub-band full-duplex (SBFD) operation, performed by a base station, characterized in that: include: The base station manages the self-interference of the base station by configuring the configured number of uplink UL subbands in the downlink DL / flexible F time slot / symbol or the configured number of DL subbands in the UL / F time slot / symbol in the outer carrier or edge resource block RB in the time division duplex TDD subband, and / or performing beam isolation of the UL subband and the DL subband, including assigning different beams to different subbands.

2. The wireless communication method according to claim 1, characterized in that: The number of configured UL subbands in the DL / F slot / symbol or the number of configured DL subbands in the UL / F slot / symbol is two.

3. The wireless communication method according to claim 1 or 2, characterized in that: The first UL subband is aligned with the first DL subband, the second DL subband and the third DL subband are isolated from the first UL subband, and the assigning of different beams to different subbands includes assigning a first receive Rx beam to the first UL subband, and assigning a first transmit Tx beam and a second transmit Tx beam to the second DL subband and the third DL subband, respectively.

4. The wireless communication method according to any one of claims 1 to 3, characterized in that: The method also includes the base station indicating, to a user equipment UE, an Rx beam allocated to the UL subband and a Tx beam allocated to the DL subband in the subband configuration.

5. The wireless communication method according to any one of claims 1 to 4, characterized in that: The base station also manages the co-channel sub-band interference between neighboring base stations by performing at least one or all of the following operations: maintaining the same bandwidth of UL to UL subband and DL to DL subband between the neighboring base stations; allocating similar subbands to UL transmission and DL transmission between the neighboring base stations; allocating a similar number of subbands for DL ​​transmission and UL transmission between the neighboring base stations; and / or The same number of subbands is configured between the neighboring base stations.

6. The wireless communication method according to claim 5, characterized in that: The neighboring base stations exchange SBFD-based auxiliary information through backhaul signaling or over-the-air OTA signaling using an Xn interface, where the SBFD-based auxiliary information includes subband bandwidth, the number of subbands and / or allocation of subbands within a TDD band to UL / DL transmission.

7. The wireless communication method according to any one of claims 3 to 6, characterized in that: The method also includes managing the inter-subband interference of the first base station to the second base station by allocating different beams between the DL subband and the UL subband and setting an isolation gap between the DL subband and the UL subband.

8. The wireless communication method according to claim 7, characterized in that: In the first base station and the second base station, the first Rx beam is allocated to the first UL sub-band, and the first Tx beam and the second Tx beam are allocated to the second DL sub-band and the third DL sub-band, respectively.

9. The wireless communication method according to any one of claims 1 to 8, characterized in that: It also includes the base station managing UE-to-UE intra-cell inter-subband interference by configuring the configured number of the UL subbands in the DL / F time slot / symbol or the configured number of the DL subbands in the UL / F time slot / symbol on the UE, and / or performing the beam isolation of the UL subband and the DL subband on the UE, including allocating the different beams to the different subbands on the UE.

10. The wireless communication method according to claim 9, characterized in that: The configured number of the UL subbands in the DL / F slot / symbol or the configured number of the DL subbands in the UL / F slot / symbol is two.

11. The wireless communication method according to claim 9 or 10, characterized in that: Allocating the different beams to the different subbands on the UE includes allocating the first Rx beam to the first UL subband on the UE, and allocating the first Tx beam and the second Tx beam to the second DL subband and the third DL subband on the UE, respectively.

12. The wireless communication method according to any one of claims 9 to 11, characterized in that: The method also includes the base station indicating, to the UE in the subband configuration, the Rx beam allocated to the UL subband and the Tx beam allocated to the DL subband.

13. The wireless communication method according to any one of claims 9 to 12, characterized in that: The base station also manages the intra-subband interference between UE and UE on the same channel cell by performing at least one or all of the following operations: Maintaining the same bandwidth of the UL to UL subband and the DL to DL subband between UEs served by the neighboring base station; allocating similar subbands to UL transmission and DL transmission among UEs served by the neighboring base stations; allocating a similar number of subbands for the DL transmission and the UL transmission between UEs served by the neighboring base station; and / or The same number of subbands is configured between UEs served by the neighboring base stations.

14. The wireless communication method according to any one of claims 9 to 13, characterized in that: It also includes managing UE-to-UE co-channel inter-cell inter-subband interference by the base station by allocating different beams for DL ​​subbands and UL subbands on the UE and setting an isolation gap between the DL subbands and the UL subbands.

15. The wireless communication method according to claim 14, characterized in that: In the first cell and the second cell, the first Rx beam is allocated to the first UL subband, the first Tx beam and the second Tx beam are allocated to the second DL subband and the third DL subband, respectively, and the Tx and Rx beams allocated to each UE are different from UEs across cells.

16. A base station, characterized in that: include: Memory; Transceiver; as well as a processor coupled to the memory and the transceiver; Wherein, the processor is configured to execute the method of any one of claims 1 to 15.

17. A non-transitory machine-readable storage medium, characterized in that: Instructions are stored thereon, and when a computer executes the instructions, the instructions cause the computer to perform the method of any one of claims 1 to 15.

18. A chip, characterized in that: include: A processor configured to call and run a computer program stored in a memory so that a device equipped with the chip executes a method according to any one of claims 1 to 15.

19. A computer-readable storage medium, characterized in that: A computer program is stored therein, wherein the computer program causes a computer to execute the method of any one of claims 1 to 15.

20. A computer program product, characterized in that Comprising a computer program, wherein the computer program causes a computer to perform the method of any one of claims 1 to 15.

21. A computer program, characterized in that The computer program causes a computer to execute the method of any one of claims 1 to 15.

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