Guard band determination
By dynamically determining and applying different guard band sizes based on interference conditions, the method addresses inefficiencies in frequency resource utilization in wireless cellular access networks, improving network performance and resource efficiency.
Patent Information
- Application Number
- PCT/CN2023/113520
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-08-17
- Publication Date
- 2025-02-20
AI Technical Summary
Existing wireless cellular access networks face inefficiencies in frequency resource utilization due to the use of a fixed guard band size for both base stations and user equipment, which does not adapt to varying interference situations.
The implementation of methods to dynamically determine and apply different guard band sizes between downlink and uplink transmissions based on the interference situation, allowing for more efficient utilization of frequency resources.
This approach improves the overall efficiency of frequency resource usage in wireless cellular access networks by adapting the guard band size to specific interference conditions, thereby enhancing network performance.
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Figure CN2023113520_20022025_PF_FP_ABST
Abstract
Description
GUARD BAND DETERMINATIONTECHNICAL FIELD
[0001] This disclosure generally relates to handling transmissions in a wireless cellular access network and is specifically directed to mechanisms for determining a guard band.BACKGROUND
[0002] Guard band is widely used in communication systems to prevent the Cross Link Interference (CLI) or Self-Interference (SI) from Downlink (DL) to Uplink (UL) at the base station side or from UL to DL at the User Equipment (UE) side. Guard band is a part of frequency resources in between the DL resource and UL resource, and no signal is transmitted within the guard band. As an example, in a Subband Full Duplex (SBFD) system, guard band can be applied in between the DL subband for DL transmission and UL subband for UL transmission to avoid interference from DL to UL at base station side and to avoid interference from UL to DL at the UE side.
[0003] However, due to the form factor and implementation complexity, typically, a UE requires a larger guard band, and the base station requires a smaller guard band. If the UE always applies the larger guard band, the frequency resource within the larger guard band is not efficiently utilized since there may be cases when there is no CLI or SI, e.g., DL transmission and UL transmission don’ t occur simultaneously. On the other hand, if the UE always applies the smaller guard band, there may be cases when there is strong CLI or SI, e.g., DL transmission and UL transmission occur simultaneously.SUMMARY
[0004] This disclosure generally relates to handling transmissions in a wireless cellular access network and is specifically directed to mechanisms for determining a guard band. Previously, guard band and other parameters related to interference have not been adjusted based on the interference situation. In the existing systems, the same guard band is used for the base station and UE. In addition, only one guard band is used for base station and the UE, and the guard band cannot be efficiently selected based on both the DL and UL transmissions. Similar issue exists for other parameters that may impact the interference.
[0005] The various example embodiments are particularly directed to new methods to determine and apply a guard band in response to various situations. These methods improve frequency resource utilization efficiency, thereby improving overall usage efficiency of the network.
[0006] In some exemplary implementations, a method performed by a wireless device includes applying a guard band between a DL subband comprising at least one unit of frequency resource for DL transmission and an UL subband comprising at least one unit of frequency resource for UL transmission, and determining whether to apply a first guard band with at least a first size of a first set of units of frequency resources as the guard band, or a second guard band with a second size of a second set of units of frequency resources as the guard band, wherein the second size is larger than the first size.
[0007] In some exemplary implementations, which may be combined with any of the other exemplary implementations disclosed herein, the wireless device may be a wireless access network node, and the method may include indicating, by the wireless access network node to a wireless terminal device, the first guard band, and receiving, from the wireless terminal device, an indication of the second guard band. Similarly, the wireless device may be a wireless terminal device, and the method may include receiving, by the wireless terminal device from a wireless access network node, an indication of the first guard band, and indicating, by the wireless terminal device to the wireless access network node, the second guard band.
[0008] In some exemplary implementations, which may be combined with any of the other exemplary implementations disclosed herein, the wireless device may be a wireless access network node, and the method may include indicating, by the wireless access network node to a wireless terminal device, the first guard band and the second guard band. Similarly, the wireless device may be a wireless terminal device, and the method may include receiving, by the wireless terminal device from a wireless access network node, an indication of the first guard band and the second guard band.
[0009] In some implementations, a center of the first guard band in a frequency domain is aligned with a center of the second guard band in the frequency domain. In other implementations, an edge of the first guard band, a corresponding edge of the second guard band, and an edge of the UL subband are aligned in the frequency domain. In other implementations, an edge of the first guard band, a corresponding edge of the second guard band, and an edge of the DL subband are aligned in the frequency domain.
[0010] In some exemplary implementations, which may be combined with any of the other exemplary implementations disclosed herein, the wireless device is a wireless terminal device, and the method includes applying, by the wireless terminal device, the second guard band as a default guard band. The method may include applying, by the wireless terminal device, the first guard band as a default guard band. The method may include receiving, by the wireless terminal device from a wireless access network node, an indication of whether to use the first guard band or the second guard band in a field in Downlink Control Information (DCI) signaling. The method may include receiving, by the wireless terminal device from a wireless access network node, an indication of whether to use the first guard band or the second guard band in a field in Medium Access Control Control Element (MAC-CE) signaling. The method may include receiving, by the wireless terminal device from a wireless access network node, an indication of whether to use the first guard band or the second guard band by receiving a pattern for applying the first guard band and the second guard band within a time period in a field in Medium Access Control Control Element (MAC-CE) signaling or Radio Resource Control (RRC) signaling.
[0011] In some exemplary implementations, which may be combined with any of the other exemplary implementations disclosed herein, the DL transmission in the DL subband and an UL transmission in the UL subband are overlapped in a time domain, in a frequency domain, in both a time domain and a frequency domain, in a same period of time, or in a same frequency area. The method may include determining that the DL transmission and the UL transmission are overlapped, and applying the second guard band responsively.
[0012] In some examples, the wireless device may be a wireless terminal device, and the method may include receiving, by the wireless terminal device from a wireless access network node, an indication of the frequency area comprising at least one unit of frequency resource; determining, by the wireless terminal device, that the DL transmission and the UL transmission are overlapped; determining, by the wireless terminal device, that the UL transmission is overlapped with the frequency area; and applying the second guard band responsively. Similarly, the wireless device may be a wireless access network node, and the method may include indicating, by the wireless access network node to a wireless terminal device, the frequency area comprising at least one unit of frequency resource; determining, by the wireless access network node, that the DL transmission and the UL transmission are overlapped; determining, by the wireless access network node, that the UL transmission is overlapped with the frequency area; and applying the second guard band responsively.
[0013] In some examples, the wireless device is a wireless terminal device, and the method includes receiving, by the wireless terminal device from a wireless access network node, an indication of the frequency area comprising at least one unit of frequency resource; determining, by the wireless terminal device, that the DL transmission and the UL transmission are overlapped; determining, by the wireless terminal device, that the DL transmission is overlapped with the frequency area; and applying the second guard band responsively. Similarly, the wireless device is a wireless access network node, and the method includes indicating, by the wireless access network node to a wireless terminal device, the frequency area comprising at least one unit of frequency resource; determining, by the wireless access network node, that the DL transmission and the UL transmission are overlapped; determining, by the wireless access network node, that the DL transmission is overlapped with the frequency area; and applying the second guard band responsively.
[0014] In some examples, the wireless device may be a wireless terminal device, and the method may include determining, by the wireless terminal device, that a Semi-Persistent Scheduling (SPS) Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission is overlapped with a Configured Grant (CG) Physical Uplink Shared Channel (PUSCH) UL resource for the UL transmission; and applying the second guard band responsively. Similarly, the method may include determining, by the wireless terminal device, that a dynamically scheduled Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission is overlapped with a dynamically scheduled Physical Uplink Shared Channel (PUSCH) UL resource for the UL transmission, and that a Physical Downlink Control Channel (PDCCH) resource scheduling the PDSCH DL resource arrives X1 symbols later than a PDCCH resource scheduling the PUSCH UL resource; and applying the second guard band responsively. The method may include determining, by the wireless terminal device, that a dynamically scheduled Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission is overlapped with a Configured Grant (CG) Physical Uplink Shared Channel (PUSCH) UL resource for the UL transmission; and applying the second guard band responsively.
[0015] In some embodiments, the wireless device is a wireless terminal device, and the method may include determining, by the wireless terminal device, that a Semi-Persistent Scheduling (SPS) Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission is overlapped with a dynamically scheduled Physical Uplink Shared Channel (PUSCH) UL resource for the UL transmission, and that a Physical Downlink Control Channel (PDCCH) resource scheduling the PUSCH UL resource arrives X2 symbols before the SPS PDSCH DL resource; and applying the second guard band responsively. The method may include determining, by the wireless terminal device, that a Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission spans across two DL subbands; and applying the second guard band responsively. The method may include determining, by the wireless terminal device, that a Physical Downlink Control Channel (PDCCH) DL resource for the DL transmission is overlapped with the UL transmission; and applying the second guard band responsively, wherein a Control Channel Element (CCE) overlapped in both the time domain and the frequency domain with the second guard band is not available for the PDCCH. The method may include determining, by the wireless terminal device, that Channel State Information Reference Signal (CSI-RS) DL resource for the DL transmission is overlapped with the UL transmission; applying the second guard band responsively; and generating a measurement result for the CSI-RS Dl resource that is overlapped in both the time domain and the frequency domain with the second guard band separately.
[0016] In some exemplary implementations, which may be combined with any of the other exemplary implementations disclosed herein, the method may include determining whether to apply a first set of power control parameters or a second set of power control parameters. The method may further include determining to apply the first set of power control parameters when applying the first guard band, and determining to apply the second set of power control parameters when applying the second guard band.
[0017] In various approaches, the power control parameters comprise at least one of the following: a UE maximum output power; a maximum output power reduction; a configured transmitted power; a Power sharing mode comprising at least one of a semi-static power sharing mode or a dynamic power sharing mode; or a step size for power update triggered by a Transmit Power Control (TPC) command. The method may include determining to apply the second guard band; and responsively activating at least one of the following: a larger UE maximum output power; a smaller maximum output power reduction; a larger configured transmitted power; a dynamic power sharing; or a larger step size for power update triggered by the TPC command. Similarly, the method may include determining to apply the first guard band; and responsively activating at least one of the following: a smaller UE maximum output power; a larger maximum output power reduction; a smaller configured transmitted power; a semi-static power sharing; or a smaller step size for power update triggered by TPC command.
[0018] In some examples, the method may include configuring a first Demodulation Reference Signal (DMRS) parameter and a second DRMS parameter; and determining to apply the first DMRS parameter in response to determining to apply the first guard band, and determining to apply the second DMRS parameter in response to determining to apply the second guard band. Similarly, the method may include determining to apply the second guard band; and activating different Demodulation Reference Signal (DMRS) signal location for DL transmissions and UL transmissions. The method may also include determining to apply the second guard band; and activating a higher reference signal or reference resource density for the DL transmission or the UL transmission in a time domain or a frequency domain.
[0019] In some examples, the method may include configuring a first rate-matching pattern and a second rate-matching pattern; and determining to apply the first rate-matching pattern in response to determining to apply the first guard band, and determining to apply the second rate-matching pattern in response to determining to apply the second guard band. In other example, the method may include configuring a first set of frequency hopping parameters and a second set of frequency hopping parameters; and determining to apply the first set of frequency hopping parameters in response to determining to apply the first guard band, and determining to apply the second set of frequency hopping parameters in response to determining to apply the second guard band. In other example, the method may include configuring a first set of beam parameters and a second set of beam parameters; and determining to apply the first set of beam parameters in response to determining to apply the first guard band, and determining to apply the second set of beam parameters in response to determining to apply the second guard band.
[0020] In various embodiments, the wireless device is a wireless access network node or base station. In other embodiments, the wireless device is a wireless terminal device or UE.
[0021] In some other implementations, an apparatus for wireless communication such as a network device is disclosed. The network device may include one or more processors and one or more memories, wherein the one or more processors are configured to read computer code from the one or more memories to implement any one of the methods above. The apparatus for wireless communication may be the wireless access network node (e.g., base station) or the wireless terminal device (e.g., UE) .
[0022] In yet some other implementations, a computer program product is disclosed. The computer program product may include a non-transitory computer-readable medium with computer code stored thereupon, the computer code, when executed by one or more processors, causing the one or more processors to implement any one of the methods above.
[0023] The above embodiments and other aspects and alternatives of their implementations are explained in greater detail in the drawings, the descriptions, and the claims below.BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 shows a wireless access network with an exemplary uplink, downlink, and control channel configuration.
[0025] FIG. 2 shows various example processing components of the wireless terminal device and the wireless access network node of FIG. 1.
[0026] FIGS. 3A, 3B, and 3C show a first and second guard band in accordance with various embodiments.
[0027] FIG. 4 shows another example of first and second guard bands in accordance with various embodiments.
[0028] FIG. 5 shows another example of first and second guard bands in accordance with various embodiments.DETAILED DESCRIPTION
[0029] The technology and examples of implementations and / or embodiments described in this disclosure can be used to facilitate over-the-air radio resource allocation, configuration, and signaling in wireless access networks as well as operational configuration of a UE and / or a base station within the wireless access networks. The term “exemplary” is used to mean “an example of” and unless otherwise stated, does not imply an ideal or preferred example, implementation, or embodiment. Section headers are used in the present disclosure to facilitate understanding of the disclosed implementations and are not intended to limit the disclosed technology in the sections only to the corresponding section. The disclosed implementations may be further embodied in a variety of different forms and, therefore, the scope of this disclosure or claimed subject matter is intended to be construed as not being limited to any of the embodiments set forth below. The various implementations may be embodied as methods, devices, components, systems, or non-transitory computer readable media. Accordingly, embodiments of this disclosure may, for example, take the form of hardware, software, firmware or any combination thereof.
[0030] This disclosure is directed to handling transmissions in a wireless cellular access network and is specifically directed to mechanisms for determining a guard band. The various example embodiments provide methods to determine and apply an appropriate guard band between UL and DL transmissions in order to improve frequency resource usage efficiency.
[0031] Wireless Network Overview
[0032] A wireless communication network may include a radio access network for providing network access to wireless terminal devices, and a core network for routing data between the access networks or between the wireless network and other types of data networks. In a wireless access network, radio resources are provided for allocation and used for transmitting data and control information. FIG. 1 shows an exemplary wireless access network 100 including a wireless access network node (WANN) or wireless base station 102 (herein referred to as wireless base station, base station, wireless access node, wireless access network node, or WANN) and a wireless terminal device or user equipment (UE) 104 (herein referred to as user equipment, UE, terminal device, or wireless terminal device) that communicates with one another via over-the-air (OTA) radio communication resources 106. The wireless access network 100 may be implemented as, as for example, a 2G, 3G, 4G / LTE, or 5G cellular radio access network. Correspondingly, the base station 102 may be implemented as a 2G base station, a 3G node B, an LTE eNB, or a 5G New Radio (NR) gNB. The user equipment 104 may be implemented as mobile or fixed communication devices installed with mobile identity modules for accessing the base station 102. The user equipment 104 may include but is not limited to mobile phones, laptop computers, tablets, personal digital assistants, wearable devices, distributed remote sensor devices, and desktop computers. Alternatively, the wireless access network 100 may be implemented as other types of radio access networks, such as Wi-Fi, Bluetooth, ZigBee, and WiMax networks.
[0033] FIG. 2 further shows example processing components of the WANN 102 and the UE 104 of FIG. 1. The UE 104, for example, may include transceiver circuitry 206 coupled to one or more antennas 208 to effectuate wireless communication with the WANN 102 (or to other UEs) . The transceiver circuitry 206 may also be coupled to a processor 210, which may also be coupled to a memory 212 or other storage devices. The memory 212 may be transitory or non-transitory and may store therein computer instructions or code which, when read and executed by the processor 210, cause the processor 210 to implement various ones of the, functions, methods, and processes of the UE 104 described herein. The memory 212 may also be utilized and allocated for buffering UL and DL transmissions in each band / carrier. The memory 212 may include multiple memory modules assigned to different functions (such as program memory, base band memory, and / or RF memory, to name a few) . Likewise, the WANN 102 may include transceiver circuitry 214 coupled to one or more antennas 216, which may include an antenna tower 218 in various forms, to effectuate wireless communications with the UE 104. The transceiver circuitry 214 may be coupled to one or more processors 220, which may further be coupled to a memory 222 or other storage devices. The memory 222 may be transitory or non-transitory and may store therein instructions or code that, when read and executed by the one or more processors 220, cause the one or more processors 220 to implement various functions, methods, and processes of the WANN 102 described herein.
[0034] Wireless Communication Resource Scheduling / Signaling
[0035] Returning to FIG. 1, the radio communication resources for the over-the-air interface 106 may include a combination of frequency, time, and / or spatial communication resources organized into various resource units or elements in frequency, time, and / or space. The radio communication resources 106 in frequency domain may include portions of licensed radio frequency bands, portions of unlicensed ration frequency bands, or portions of a mix of both licensed and unlicensed radio frequency bands. The radio communication resources 106 available for carrying the wireless communication signals between the base station 102 and user equipment 104 may be further divided into physical downlink channels 110 for transmitting wireless signals from the base station 102 to the user equipment 104 and physical uplink channels 120 for transmitting wireless signals from the user equipment 104 to the base station 102. The physical downlink channels 110 may further include physical downlink control channels (PDCCHs) 112 and physical downlink shared channels (PDSCHs) 114. Likewise, the physical uplink channels 120 may further include physical uplink control channels (PUCCHs) 122 and physical uplink shared channels (PUSCHs) 124. For simplification, other types of downlink and uplink channels are not shown in FIG. 1 but are within the scope of the current disclosure. The control channels PDCCHs 112 and PUCCHs 122 may be used for carrying control information in the form of control messages 116 and 126, herein referred to as Downlink Control Information (DCI) messages or Uplink Control Information (UCI) messages. The shared channels (shared between data and control information) PDSCHs 114 and PUSCHs 124 may be allocated and used for communicating downlink data transmissions 118 and uplink data transmissions 128 between the base station 102 and the user equipment 104.
[0036] The allocation and configuration of the radio communication resources associated with the data channels, such as the PDSCHs and the PUSCHs may be provided by one or more resource scheduling DCIs carried in the PDCCHs. The PDCCHs may be shared by a plurality of UEs in the access network. In various approaches, a particular UE may be configured to perform blind decode procedures on a preconfigured UE-specific Search Space (USS) to detect and identify a payload of a resource scheduling DCI carried in the PDCCH that specifically targets the particular UE. The blind decoding may be performed on preconfigured monitoring occasions of the PDCCH associated with USS. Such monitoring occasions may be referred to as a set of PDCCH candidates. Each PDCCH candidate may be associated with a set of Control Channel Elements (CCEs) . The UE may specifically use its Radio Network Temporary Identifier (RNTI) to decode the PDCCH candidates. The RNTI may be used to demask a PDCCH candidate’s CRC. If no CRC error is detected, the UE determines that PDCCH candidate carries its own control information. The UE may then process the DCI and extract the resource allocation information pertaining to the PDSCH and / or PUSCH for receiving and / or transmitting data.
[0037] Description of New Mechanisms for Guard Band Determination
[0038] In accordance with the present disclosure, a method is disclosed to determine and apply an appropriate guard band in different situations in order to efficiently utilize frequency resources. The method is used to determine which guard band is applied or to determine which size of guard band is applied between, for example, a first guard band and a second guard band. The guard bands contain one or multiple units of frequency resource. In various examples, the first guard band has a size S1, and the second guard band has a size S2, where S2 is larger than S1.
[0039] The guard band is in between the DL subband and the UL subband to mitigate CLI between DL and UL. The DL subband contains one or multiple units of frequency resource for DL transmission, and the UL subband contains one or multiple units of frequency resource for UL transmission. The unit may be Resource Element (RE) , Resource Block (RB) , Resource Block Group (RBG) , hertz (Hz) , or another unit of frequency resource.
[0040] In accordance with various embodiments, the method performed by a wireless device (e.g., the wireless terminal device or UE 104, or the WANN or wireless base station 102) includes applying a guard band between a DL subband and an UL subband, and determining whether to apply a first guard band with at least a first size of a first set of units of frequency resources as the guard band, or a second guard band with a second size of a second set of units of frequency resources as the guard band, wherein the second size is larger than the first size.
[0041] There are different alternative methods in which the guard bands can be indicated between the base station 102 and the UE 104. In a first alternative, the first guard band is indicated from the base station 102 to the UE 104, and the second guard band is indicated from the UE 104 to the base station 102. In one embodiment, the first guard band is the guard band required by the base station 102, and the second guard band is the guard band required by the UE 104. In another embodiment, the first guard band is a cell-specific configuration, and the second guard band is a UE-specific capability. In this embodiment, the method may include indicating the first guard band by the wireless access network node 102 to the wireless terminal device 104, and receiving, from the wireless terminal device 104, an indication of the second guard band. Alternatively, the method may include receiving, by the wireless terminal device 104 from the wireless access network node 102, an indication of the first guard band, and indicating, by the wireless terminal device 104 to the wireless access network node 102, the second guard band.
[0042] In a second alternative, the first guard band is indicated from base station 102 to the UE 104, and the second guard band is also indicated from base station 102 to the UE 104. In one embodiment, the first guard band is for the case with smaller interference, and the second guard band is for the case with larger interference. For example, both the first and second guard bands may be configured by Radio Resource Control (RRC) signaling. In this embodiment, the method may include indicating, by the wireless access network node 102 to a wireless terminal device 104, the first guard band and the second guard band. Alternatively, the method may include receiving, by the wireless terminal device 104 from the wireless access network node 102, an indication of the first guard band and the second guard band.
[0043] In a third alternative, the first guard band is indicated from the UE 104 to the base station 102, and the second guard band is also indicated from the UE 104 to the base station 102. In one embodiment, the first guard band is for the case with smaller interference, and the second guard band is for the case with larger interference. For example, both of the first and second guard bands may be indicated by the UE 104 capability.
[0044] In a fourth alternative, the first guard band is indicated from the UE 104 to the base station 102 , and the second guard band is indicated from the base station 102 to the UE 104. In one embodiment, the first guard band is for the case with smaller interference, and the second guard band is for the case with larger interference.
[0045] In various embodiments, there may be three alternatives for the relationship between the first guard band and the second guard band. In a first alternative, as is illustrated in FIG. 3A, the center of the first guard band in the frequency domain is aligned with the center of the second guard band in the frequency domain. In a second alternative, as is illustrated in FIG. 3B, a lower edge of the first guard band in the frequency domain is aligned with the lower edge of the second guard band in the frequency domain. In a third alternative, as is illustrated in FIG. 3C, the higher edge of the first guard band in the frequency domain is aligned with the higher edge of the second guard band in the frequency domain.
[0046] In another approach, the relationship between the first guard band and the second guard band can also be designed from the DL subband and the UL subband perspective. In a first alternative, the edge of the first guard band, the edge of the second guard band, and the edge of the UL subband are aligned in the frequency domain. This is similar to the illustrated relationship between the first and second guard bands in FIG. 3B. In other words, the UL subband may be kept the same regardless of whether the first guard band or the second guard band is applied. Some of the DL resources in the DL subband may be converted to guard band when the guard band is switched from the first guard band to the second guard band. In this case, the UL filter for UL subband may be kept the same regardless of which guard band is applied.
[0047] In a second alternative, the edge of first guard band, the edge of the second guard band, and the edge of the DL subband are aligned in the frequency domain. This is similar to the illustrated relationship between the first and second guard bands in FIG. 3C. In other words, the DL subband may be kept the same regardless of whether the first guard band or the second guard band is applied. Some of the UL resources in the UL subband may be converted to guard band when the guard band is switched from the first guard band to the second guard band. In this case, the DL filter for DL subband may be kept the same regardless of which guard band is applied.
[0048] In some embodiments, a default guard band may be established. In a first alternative, the UE 104 applies the guard band with larger size as a default guard band (e.g., the second guard band) . In this case, interference can be well mitigated. In a second alternative, the UE 104 applies the guard band with smaller size as a default guard band (e.g., the first guard band) . In this case, the frequency resource can be utilized more efficiently.
[0049] The resource (s) in the guard band are not available for DL transmission or UL transmission. Alternatively, the DL transmission or UL transmission may perform rate-matching around the resource (s) in the guard band. For example, if the second guard band is applied in one case, the resource (s) within the second guard band may not available for DL transmission or UL transmission, or the DL / UL transmission may perform rate-matching around the resource in the second guard band.
[0050] Detailed methods for determining the guard band are disclosed. In various embodiments, the UE 104 determines which guard band is applied based on whether the DL transmission and UL transmission are overlapped. The DL transmission and the UL transmission may be considered to be overlapped under at least one of the following cases:
[0051] Case 1: The DL transmission and the UL transmission are overlapped in the time domain.
[0052] Case 2: The DL transmission and the UL transmission are overlapped in the frequency domain.
[0053] Case 3: The DL transmission and the UL transmission are overlapped in both time domain and frequency domain. This represents actual interference between the UL and DL transmissions.
[0054] Case 4: The DL transmission and the UL transmission occur within a same period of time. The period of time may be a slot, a sub-slot, a frame, a subframe, a TDD period, or another period of time. In this case, the DL transmission and the UL transmission may not happen in the same symbol. Instead, they may both occupy some of the same period of time (e.g., they both occupy the same slot) , so they overlap in accordance with this example.
[0055] Similarly, in another example, the DL transmission and the UL transmission may overlap in a same frequency area.
[0056] In one alternative, if the DL transmission and the UL transmission are overlapped, the guard band with larger size (e.g., the second guard band) may be applied. Otherwise, the guard band with a smaller size (e.g., the first guard band) may be applied. Accordingly, the method may include determining that the DL transmission and the UL transmission are overlapped, and applying the second guard band responsively.
[0057] In a second alternative, if the DL transmission and the UL transmission are overlapped, and the UL transmission is overlapped with a frequency area (e.g., the frequency area may still be within UL subband, but near an edge of the UL subband closer to the DL subband) , the guard band with larger size (e.g., the second guard band) may be applied since the UL transmission overlapped with this frequency area causes large CLI or SI. Otherwise, the guard band with smaller size (e.g., the first guard band) may be applied. The frequency area may be indicated by the base station 102, and it may contain one or multiple units of frequency resource. Similarly, the unit of frequency area can be RE, RB, RBG, Hz, etc. For example, the configured frequency area may be close to the DL resource so that it may cause a large interference.
[0058] In the second alternative, the method may include receiving, by the wireless terminal device 104 from the wireless access network node 102, an indication of the frequency area comprising at least one unit of frequency resource, determining, by the wireless terminal device 104, that the DL transmission and the UL transmission are overlapped, determining, by the wireless terminal device 104, that the UL transmission is overlapped with the frequency area, and applying the second guard band responsively. Similarly, the method may include indicating, by the wireless access network node 102 to the wireless terminal device 104, the frequency area comprising at least one unit of frequency resource, determining, by the wireless access network node 102, that the DL transmission and the UL transmission are overlapped, determining, by the wireless access network node 102, that the UL transmission is overlapped with the frequency area, and applying the second guard band responsively.
[0059] In a third alternative, if the DL transmission and UL transmission are overlapped, and the DL transmission is overlapped with a frequency area, the guard band with a larger size (e.g., the second guard band) may be applied. Otherwise, the guard band with a smaller size (e.g., the first guard band) may be applied. The frequency area may be indicated by the base station 102, and it may contain one or multiple units of frequency resource. In this case, for example, the configured frequency area is close to the UL resource so that it may cause large interference.
[0060] In the third alternative, the method may include receiving, by the wireless terminal device 104 from the wireless access network node 102, an indication of the frequency area comprising at least one unit of frequency resource, determining, by the wireless terminal device 104, that the DL transmission and the UL transmission are overlapped, determining, by the wireless terminal device 104, that the DL transmission is overlapped with the frequency area, and applying the second guard band responsively. Similarly, the method may include indicating, by the wireless access network node 102 to the wireless terminal device 104, the frequency area comprising at least one unit of frequency resource, determining, by the wireless access network node 102, that the DL transmission and the UL transmission are overlapped, determining, by the wireless access network node 102, that the DL transmission is overlapped with the frequency area, and applying the second guard band responsively.
[0061] With reference to FIG. 4, an example of the first alternative and Case 1 is illustrated (e.g., where the DL transmission and UL transmission are overlapped in the time domain, and the guard band with a larger size (e.g., the second guard band) is applied, and otherwise, the guard band with a smaller size (e.g., the first guard band) is applied) . As shown in FIG. 4, in slot 2, there is no UL transmission overlapped with the PDSCH. Thus, the small guard band (first guard band) is applied. While in slot 3, the UL transmission and the DL transmission are overlapped in the time domain with each other, and the larger guard band (second guard band) is applied.
[0062] In various embodiments, The DL transmission may contain at least one of the following: Physical Downlink Shared Channel (PDSCH) , including the dynamically scheduled PDSCH and SPS (Semi-Persistent Scheduling) PDSCH; Physical Downlink Control Channel (PDCCH) ; Channel State Information Reference Signal (CSI-RS) ; Physical Broadcast Channel (PBCH) ; Other DL channels or signals. The UL transmission may contains at least one of the following: Physical Uplink Shared Channels (PUSCH) , including the dynamically scheduled PUSCH and Configured Grant (CG) PUSCH; Physical Uplink Control Channel (PUCCH) ; Sounding Reference Signal (SRS) ; Physical Random Access Channel (PRACH) ; or other UL channels or signals.
[0063] In various embodiments, the UE 104 may determine which guard band is applied based on the resource for DL / UL transmission and / or the timeline.
[0064] In a first alternative, if the DL resource for SPS PDSCH and UL resource for CG PUSCH are overlapped, the guard band with larger size (e.g., the second guard band) may be applied. In this case, regardless of whether there are actual SPS PDSCH transmission in the DL resource or actual CG PUSCH in the UL resource, the guard band with larger size (second guard band) is applied since the base station 102 may not be able to anticipate in advance whether there will be actual CG PUSCH, and the UE may not be able to anticipate in advance whether there will be actual SPS PDSCH. In this alternative, the method may include determining, by the wireless terminal device 104, that a SPS PDSCH DL resource for the DL transmission is overlapped with a CG PUSCH UL resource for the UL transmission, and applying the second guard band responsively.
[0065] In a second alternative, if the dynamically scheduled PDSCH is overlapped with the dynamically scheduled PUSCH, and the PDCCH scheduling the PDSCH arrives X1 symbols later than the PDCCH scheduling the PUSCH, the guard band with a larger size (e.g., the second guard band) is applied. The reason is that, the UE 104 may need time duration to determine whether to apply the first guard band or the second guard band when decoding the PDSCH based on the location of the PUSCH, thus the PDCCH scheduling the PUSCH needs to arrive later. X1 is not less than 0, and X1 can be an integer (e.g., 1, 2 and 3) or a decimal (e.g., 0.5 and 1.5) . In this second alternative, the method may include determining, by the wireless terminal device 104, that a dynamically scheduled Physical PDSCH DL resource for the DL transmission is overlapped with a dynamically scheduled PUSCH UL resource for the UL transmission, and that a PDCCH resource scheduling the PDSCH DL resource arrives X1 symbols later than a PDCCH resource scheduling the PUSCH UL resource, and applying the second guard band responsively.
[0066] In a third alternative, if the dynamically scheduled PDSCH is overlapped with the UL resource for CG PUSCH, the guard band with larger size (e.g., the second guard band) may be applied, because the base station 102 may not be able to anticipate in advance whether there will be actual CG PUSCH. In this case, the base station 102 may consider the worst case and apply the larger guard band. In this third alternative, the method may include determining, by the wireless terminal device 104, that a dynamically scheduled PDSCH DL resource for the DL transmission is overlapped with a CG PUSCH UL resource for the UL transmission, and applying the second guard band responsively.
[0067] In a fourth alternative, if the dynamically scheduled PUSCH is overlapped with the DL resource for SPS PDSCH, and the PDCCH scheduling the PUSCH arrives X2 symbols before the DL resource for SPS PDSCH, the guard band with larger size (e.g., the second guard band) may be applied. This is because the UE 104 may not be able to anticipate in advance whether there will be actual SPS PDSCH. The UE 104 may need some time to preparing for the SPS PDSCH decoding. X2 is not less than 0, and X2 can be an integer (e.g., 1, 2 and 3) or a decimal (e.g., 0.5 and 1.5) . In this fourth alternative, the method may include determining, by the wireless terminal device 104, that a SPS PDSCH DL resource for the DL transmission is overlapped with a dynamically scheduled PUSCH UL resource for the UL transmission, and that a PDCCH resource scheduling the PUSCH UL resource arrives X2 symbols before the SPS PDSCH DL resource, and applying the second guard band responsively.
[0068] In some examples, if the PDSCH spans across two DL subbands, the guard band with a larger size (e.g., the second guard band) may be applied. This is because the PDSCH may cause interference to the UL subband in between the two DL subbands. With reference to FIG. 5 as an example, the PDSCH is shown as spanning across two DL subbands. The larger guard band (second guard band) is applied in this case to avoid large interference to the UL subband or interference to the DL. Note that, the PDSCH may perform rate-matching around the guard band and the UL subband, thus the PDSCH may not occupy the resource within the guard band and the resource within the UL subband. At the base station 102 side, the larger guard band can help to mitigate the interference from PDSCH to the UL subband. At the UE 104 side, the larger guard band can help to mitigate the interference from UL transmission in the UL subband to the PDSCH. In this example, the method may include determining, by the wireless terminal device 104, that a PDSCH DL resource for the DL transmission spans across two DL subbands, and applying the second guard band responsively.
[0069] Similarly, if the PUSCH spans across two UL subbands, the guard band with larger size (e.g., the second guard band) may be applied.
[0070] In accordance with various embodiments, the appropriate guard band may be indicated using Downlink Control Information (DCI) , Medium Access Control Control Element (MAC-CE) , or Radio Resource Control (RRC) signaling. In a first alternative, a field in the DCI is applied to indicate the guard band. For example, 1 bit in the DCI may be applied in the DCI, where value ‘0’ may indicate the guard band with a smaller size, and a value ‘1’ may indicate the guard band with a larger size. In this first alternative, the method may include receiving, by the wireless terminal device 104 from a wireless access network node 102, an indication of whether to use the first guard band or the second guard band in a field in DCI signaling.
[0071] In a second alternative, the MAC-CE may be applied to indicate the guard band. Once the guard band is indicated by the MAC-CE, the guard band indicated by the MAC-CE may be applied until a new MAC-CE indicating another guard band is received. In this second alternative, the method may include receiving, by the wireless terminal device 104 from the wireless access network node 102, an indication of whether to use the first guard band or the second guard band in a field in MAC-CE signaling.
[0072] In a third alternative, the MAC-CE or RRC signaling may be applied to indicate a pattern of the guard band applied within a time period. For example, the MAC-CE may indicate “1100” , where value ‘0’ may indicate the guard band with smaller size, and value ‘1’ may indicate the guard band with larger size. “1100” thus may indicate that the guard band with a larger size is applied for the first 2 time units, and the guard band with a smaller size is applied for the last 2 time units. The time units can be symbol, slot, sub-slot, subframe, frame, etc. In this second alternative, the method may include receiving, by the wireless terminal device 104 from a wireless access network node 102, an indication of whether to use the first guard band or the second guard band by receiving a pattern for applying the first guard band and the second guard band within a time period in a field in MAC-CE signaling or RRC signaling.
[0073] In certain examples, for PDCCH, if the DL resource for PDCCH is overlapped with the UL transmission, the guard band with a larger size (second guard band) is applied and the Control Channel Element (CCE) overlapped (in both the time and frequency domains) with the guard band with the larger size is not available for the PDCCH. In this case, the interference can be mitigated by not using those CCEs. In this example, the method may include determining, by the wireless terminal device 104, that a PDCCH DL resource for the DL transmission is overlapped with the UL transmission, and applying the second guard band responsively, wherein a CCE overlapped in both the time domain and the frequency domain with the second guard band is not available for the PDCCH.
[0074] In another example, for CSI-RS, if the DL resource for CSI-RS is overlapped with UL transmission, the guard band with a larger size (second guard band) is applied, and the measurement result for the CSI-RS resource that is overlapped (in both the time and frequency domains) with guard band with the larger size may be separately generated. If the CSI report for the CSI-RS is configured as ‘wideband’ (e.g., wideband CQI or wideband PMI) , the UE 104 may generate two measurement results, i.e., one for the CSI-RS resource not overlapped with the guard band with the larger size, and another one for the CSI-RS resource overlapped with the guard band with the larger size. The two measurement results may be reported to the base station 102 via the same CSI report or via separate CSI reports. In this case, the measurement result for CSI-RS resources not overlapping with the guard band is not impacted by the measurement result for the CSI-RS resources overlapping with guard band. As such, in this example, the method may include determining, by the wireless terminal device 104, that CSI-RS DL resource for the DL transmission is overlapped with the UL transmission, applying the second guard band responsively, and generating a measurement result for the CSI-RS Dl resource that is overlapped in both the time domain and the frequency domain with the second guard band separately.
[0075] While the preceding description is directed principally to determining which guard band to apply, the following description details other parameters that may be altered as well. The following parameters may also be determined according to whether the DL transmission and UL transmission are overlapped or not. Alternatively, the following parameters may also be determined according to which guard band is applied.
[0076] In one example, two (or more) sets of power control parameters are configured, where one of set of power control parameters is applied when the DL transmission and UL transmission are overlapped, and the other set is applied otherwise. Alternatively, one set of power control parameters is applied when the guard band with larger size is applied (e.g., the second guard band) , and the other set is applied otherwise. In this example, the method may include determining whether to apply a first set of power control parameters or a second set of power control parameters, and may further include determining to apply the first set of power control parameters when applying the first guard band, and determining to apply the second set of power control parameters when applying the second guard band.
[0077] In some approaches, the power control parameters comprise at least one of the following: a UE maximum output power; a maximum output power reduction; a configured transmitted power; a Power sharing mode comprising at least one of a semi-static power sharing mode or a dynamic power sharing mode; or a step size for power update triggered by a Transmit Power Control (TPC) command.
[0078] In one embodiment, when the DL transmission and UL transmission are overlapped, or when the guard band with a larger size (e.g., second guard band) is applied, at least one of the following is responsively activated: a larger UE maximum output power; a smaller maximum output power reduction; a larger configured transmitted power; a dynamic power sharing; or a larger step size for power update triggered by the TPC command.
[0079] When the DL transmission and UL transmission are not overlapped, or when the guard band with a smaller size (e.g., first guard band) is applied, at least one of the following is responsively activated: a smaller UE maximum output power; a larger maximum output power reduction; a smaller configured transmitted power; a semi-static power sharing; or a smaller step size for power update triggered by TPC command.
[0080] In some examples, two (or more) sets of demodulation reference signal (DMRS) parameters are configured, where one set is applied when the DL transmission and UL transmission are overlapped, and the other set is applied otherwise. Alternatively, one set is applied when the guard band with larger size (e.g., the second guard band) is applied, and the other set is applied otherwise. In this example, the method may include configuring a first DMRS parameter and a second DRMS parameter, and determining to apply the first DMRS parameter in response to determining to apply the first guard band, and determining to apply the second DMRS parameter in response to determining to apply the second guard band.
[0081] The DMRS parameters may contain at least DMRS location, e.g., dmrs-TypeA-Position, which is to indicate the position of (first) DM-RS for downlink and uplink, dmrs-Additional Position which is to indicate the position for additional DM-RS in DL or UL.
[0082] In another example, when the DL transmission and UL transmission are overlapped, or when the guard band with the larger size (e.g., the second guard band) is applied, at least the following is activated: Different DMRS locations for DL transmission and UL transmission to avoid interference between the DMRS for DL and UL. In this example, the method may include determining to apply the second guard band, and activating different DMRS signal location for DL transmissions and UL transmissions. When the DL transmission and UL transmission are not overlapped, or when the guard band with the smaller size (e.g., first guard band) is applied, at least the following is activated: The same DMRS location for DL transmission and UL transmission, which is the same as the legacy 5G system.
[0083] In one embodiment, when the DL transmission and UL transmission are overlapped, or when the guard band with larger size (e.g., second guard band) is applied, a higher reference signal (or reference resource) density for the DL transmission or for UL transmission in the time domain or the frequency domain may be activated. Thus, more reference signals can be applied to measure the interference to mitigate the interference. In this example, the method may include determining to apply the second guard band, and activating a higher reference signal or reference resource density for the DL transmission or the UL transmission in a time domain or a frequency domain. Conversely, when the DL transmission and UL transmission are not overlapped, or when the guard band with a smaller size (e.g., first guard band) is applied, a lower reference density in the time domain or the frequency domain can be activated.
[0084] For example, when the DL transmission and UL transmission are overlapped, the DMRS for DL may be located every two Res. When the DL transmission and UL transmission are not overlapped, the DMRS for DL may be located every four REs.
[0085] The reference signal (or reference resource) may contain at least one of the following for DL or UL: Demodulation Reference Signal (DMRS) ; Channel State Information-Reference Signal (CSI-RS) ; Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) ; Tracking Reference Signal (TRS) ; Sounding Reference Signal (SRS) ; or Received Signal Strength Indication (RSSI) measurement resource.
[0086] In other embodiments, two (or more) sets of rate-matching patterns may be configured, where one of the sets of rate-matching patterns is applied when the DL transmission and UL transmission are overlapped, and the other set is applied otherwise. Alternatively, one of the sets is applied when the guard band with the larger size (e.g., the second guard band) is applied, and the other set is applied otherwise. The set of rate-matching patterns applied when the DL transmission and UL transmission are overlapped may be used to protect the channel / signal that is sensitive to interference. The rate-matching patterns can be used for DL or UL. Each rate-matching pattern may contain one or multiple rate-matching resources. The rate-matching resources for DL may not be available for DL transmission, and the rate-matching resources for UL may not be available for UL transmission. In this example, the method mat include configuring a first rate-matching pattern and a second rate-matching pattern, and determining to apply the first rate-matching pattern in response to determining to apply the first guard band, and determining to apply the second rate-matching pattern in response to determining to apply the second guard band.
[0087] In another embodiment, two (or more) sets of frequency hopping parameters are configured, where one set of frequency hopping parameters is applied when the DL transmission and UL transmission are overlapped, and the other set is applied otherwise. Alternatively, one set is applied when the guard band with the larger size (e.g., the second guard band) is applied, and the other set is applied otherwise. For example, when the DL transmission and UL transmission are overlapped, the applied frequency hopping parameters should avoid putting the transmission overlapped with the larger guard band.
[0088] The frequency hopping parameters may contain at least one of the following for determining the location of each frequency hop: Start of Physical RB (PRB) for the transmission; Frequency offsets; or Frequency hopping interval, e.g., pusch-Frequency Hopping Interval configures the number of consecutive slots for the UE 104 to perform inter-slot frequency hopping with inter-slot bundling for PUSCH. In this example, the method may include configuring a first set of frequency hopping parameters and a second set of frequency hopping parameters, and determining to apply the first set of frequency hopping parameters in response to determining to apply the first guard band, and determining to apply the second set of frequency hopping parameters in response to determining to apply the second guard band.
[0089] In another embodiment, two (or more) sets of beam parameters are configured, where one set of beam parameters is applied when the DL transmission and UL transmission are overlapped, and the other set is applied otherwise. Alternatively, one set is applied when the guard band with the larger size (e.g., the second guard band) is applied, and the other set is applied otherwise. For example, when the DL transmission and UL transmission are overlapped, the applied beam parameters should avoid putting too strong interference between DL and UL by orthogonal beams for DL and UL.
[0090] The beam parameters may contain at least one of the following: Transmission configuration indication (TCI) state configuration; Reference signal for each TCI state; Source reference signal for each beam; Codebooks for PDSCH / PUSCH; or Precoding matrixes.
[0091] In another embodiment, if the UL subband is in between two DL subbands, for example in FIG. 5, the UE 104 may need to monitor PDCCH in both two DL subbands. However, if the PDCCH related configurations in the two DL subbands are separately configured, it will increase UE PDCCH monitoring burden. For example, if the PDCCH in the first DL subband is going to be monitored by the UE 104 in the slots with an odd index, and the PDCCH in the second DL subband is going to be monitored by the UE 104 in the slots with an even index, then the UE 104 needs to monitor PDCCHs in every DL slots. In this case, if some of the PDCCH parameters can be configured the same, it can help to reduce the UE PDCCH monitoring burden and / or reduce the implementation complexity.
[0092] In one embodiment, the base station 102 configures PDCCH configurations for two DL subbands to the UE 104, wherein the configurations indicate the UE 104 to monitor PDCCH in the two DL subbands. The UE 104 monitors PDCCH in the two DL subbands according to the PDCCH configurations.
[0093] The PDCCH configurations include at least one of the following:
[0094] 1) mapping of Control Channel Elements (CCE) to Resource Element Groups (REG) , e.g., interleaved mapping or non-interleaved mapping;
[0095] 2) contiguous time duration of the control resource set (CORESET) ;
[0096] 3) frequency domain resources for the CORESET;
[0097] 4) interleaver size, e.g., 2, 3 or 6;
[0098] 5) PDCCH DMRS scrambling initialization;
[0099] 6) precoder granularity in frequency domain;
[0100] 7) RB level offset in units of RB from the first RB of the first 6RB group to the first RB of BWP or to the first RB of the corresponding DL subband;
[0101] 8) bundle size, with which resource element groups (REGs) is bundled to create REG bundles;
[0102] 9) number of RBs allocated for the PDCCH in each DL subband;
[0103] 10) transmission configuration indication (TCI) field configuration;
[0104] 11) DCI formats that can be monitored for the PDCCH;
[0105] 12) periodicity of the searchspace, e.g., 1 symbol, 2 symbols or 4 symbols, etc;
[0106] 13) number of consecutive slots that a searchspace lasts in every occasion, i.e., upon every periodicity of the searchspace;
[0107] 14) searchspace type, e.g., group common searchspace or UE specific searchspace;
[0108] 15) searchspace index;
[0109] 16) CORESET index.
[0110] The base station 102 may configure the same PDCCH configurations for the two DL subbands to the UE 104. The UE 104 may monitor PDCCH in the two DL subbands according to the same PDCCH configurations for the two DL subbands.
[0111] The description and accompanying drawings above provide specific example embodiments and implementations. The described subject matter may, however, be embodied in a variety of different forms and, therefore, covered or claimed subject matter is intended to be construed as not being limited to any example embodiments set forth herein. A reasonably broad scope for claimed or covered subject matter is intended. Among other things, for example, subject matter may be embodied as methods, devices, components, systems, or non-transitory computer-readable media for storing computer codes. Accordingly, embodiments may, for example, take the form of hardware, software, firmware, storage media or any combination thereof. For example, the method embodiments described above may be implemented by components, devices, or systems including memory and processors by executing computer codes stored in the memory.
[0112] Throughout the specification and claims, terms may have nuanced meanings suggested or implied in context beyond an explicitly stated meaning. Likewise, the phrase “in one embodiment / implementation / example / approach” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment / implementation / example / approach” as used herein does not necessarily refer to a different embodiment. It is intended, for example, that claimed subject matter includes combinations of example embodiments in whole or in part.
[0113] In general, terminology may be understood at least in part from usage in context. For example, terms, such as “and” , “or” , or “and / or, ” as used herein may include a variety of meanings that may depend at least in part on the context in which such terms are used. Typically, “or” if used to associate a list, such as A, B or C, is intended to mean A, B, and C, here used in the inclusive sense, as well as A, B or C, here used in the exclusive sense. In addition, the term “one or more” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a, ” “an, ” or “the, ” may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. In addition, the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context.
[0114] Reference throughout this specification to features, advantages, or similar language does not imply that all of the features and advantages that may be realized with the present solution should be or are included in any single implementation thereof. Rather, language referring to the features and advantages is understood to mean that a specific feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, discussions of the features and advantages, and similar language, throughout the specification may, but do not necessarily, refer to the same embodiment.
[0115] Furthermore, the described features, advantages and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. One of ordinary skill in the relevant art will recognize, in light of the description herein, that the present solution can be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.
Claims
1.A method performed by wireless device comprising:applying a guard band between a downlink (DL) subband comprising at least one unit of frequency resource for DL transmission and an uplink (UL) subband comprising at least one unit of frequency resource for UL transmission; anddetermining whether to apply a first guard band with at least a first size of a first set of units of frequency resources as the guard band, or a second guard band with a second size of a second set of units of frequency resources as the guard band, wherein the second size is larger than the first size.2.The method according to claim 1,wherein the wireless device is a wireless access network node, andwherein the method comprises:indicating, by the wireless access network node to a wireless terminal device, the first guard band; andreceiving, from the wireless terminal device, an indication of the second guard band.3.The method according to claim 1,wherein the wireless device is a wireless terminal device, andwherein the method comprises:receiving, by the wireless terminal device from a wireless access network node, an indication of the first guard band; andindicating, by the wireless terminal device to the wireless access network node, the second guard band.4.The method according to claim 1,wherein the wireless device is a wireless access network node, andwherein the method comprises:indicating, by the wireless access network node to a wireless terminal device, the first guard band and the second guard band.5.The method according to claim 1,wherein the wireless device is a wireless terminal device, andwherein the method comprises:receiving, by the wireless terminal device from a wireless access network node, an indication of the first guard band and the second guard band.6.The method according to claim 1,wherein a center of the first guard band in a frequency domain is aligned with a center of the second guard band in the frequency domain.7.The method according to claim 1,wherein an edge of the first guard band, a corresponding edge of the second guard band, and an edge of the UL subband are aligned in the frequency domain.8.The method according to claim 1,wherein an edge of the first guard band, a corresponding edge of the second guard band, and an edge of the DL subband are aligned in the frequency domain.9.The method according to claim 1,wherein the wireless device is a wireless terminal device, andwherein the method comprises:applying, by the wireless terminal device, the second guard band as a default guard band.10.The method according to claim 1,wherein the wireless device is a wireless terminal device, andwherein the method comprises:applying, by the wireless terminal device, the first guard band as a default guard band.11.The method according to claim 1,wherein the wireless device is a wireless terminal device, andwherein the method comprises:receiving, by the wireless terminal device from a wireless access network node, an indication of whether to use the first guard band or the second guard band in a field in Downlink Control Information (DCI) signaling.12.The method according to claim 1,wherein the wireless device is a wireless terminal device, andwherein the method comprises:receiving, by the wireless terminal device from a wireless access network node, an indication of whether to use the first guard band or the second guard band in a field in Medium Access Control Control Element (MAC-CE) signaling.13.The method according to claim 1,wherein the wireless device is a wireless terminal device, andwherein the method comprises:receiving, by the wireless terminal device from a wireless access network node, an indication of whether to use the first guard band or the second guard band by receiving a pattern for applying the first guard band and the second guard band within a time period in a field in Medium Access Control Control Element (MAC-CE) signaling or Radio Resource Control (RRC) signaling.14.The method according to claim 1,wherein a DL transmission in the DL subband and an UL transmission in the UL subband are overlapped in a time domain, in a frequency domain, in both a time domain and a frequency domain, in a same period of time, or in a same frequency area.15.The method according to claim 14, comprising:determining that the DL transmission and the UL transmission are overlapped; andapplying the second guard band responsively.16.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:receiving, by the wireless terminal device from a wireless access network node, an indication of the frequency area comprising at least one unit of frequency resource;determining, by the wireless terminal device, that the DL transmission and the UL transmission are overlapped;determining, by the wireless terminal device, that the UL transmission is overlapped with the frequency area; andapplying the second guard band responsively.17.The method according to claim 14,wherein the wireless device is a wireless access network node, andwherein the method comprises:indicating, by the wireless access network node to a wireless terminal device, the frequency area comprising at least one unit of frequency resource;determining, by the wireless access network node, that the DL transmission and the UL transmission are overlapped;determining, by the wireless access network node, that the UL transmission is overlapped with the frequency area; andapplying the second guard band responsively.18.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:receiving, by the wireless terminal device from a wireless access network node, an indication of the frequency area comprising at least one unit of frequency resource;determining, by the wireless terminal device, that the DL transmission and the UL transmission are overlapped;determining, by the wireless terminal device, that the DL transmission is overlapped with the frequency area; andapplying the second guard band responsively.19.The method according to claim 14,wherein the wireless device is a wireless access network node, andwherein the method comprises:indicating, by the wireless access network node to a wireless terminal device, the frequency area comprising at least one unit of frequency resource;determining, by the wireless access network node, that the DL transmission and the UL transmission are overlapped;determining, by the wireless access network node, that the DL transmission is overlapped with the frequency area; andapplying the second guard band responsively.20.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:determining, by the wireless terminal device, that a Semi-Persistent Scheduling (SPS) Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission is overlapped with a Configured Grant (CG) Physical Uplink Shared Channel (PUSCH) UL resource for the UL transmission; andapplying the second guard band responsively.21.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:determining, by the wireless terminal device, that a dynamically scheduled Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission is overlapped with a dynamically scheduled Physical Uplink Shared Channel (PUSCH) UL resource for the UL transmission, and that a Physical Downlink Control Channel (PDCCH) resource scheduling the PDSCH DL resource arrives X1 symbols later than a PDCCH resource scheduling the PUSCH UL resource; andapplying the second guard band responsively.22.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:determining, by the wireless terminal device, that a dynamically scheduled Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission is overlapped with a Configured Grant (CG) Physical Uplink Shared Channel (PUSCH) UL resource for the UL transmission; andapplying the second guard band responsively.23.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:determining, by the wireless terminal device, that a Semi-Persistent Scheduling (SPS) Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission is overlapped with a dynamically scheduled Physical Uplink Shared Channel (PUSCH) UL resource for the UL transmission, and that a Physical Downlink Control Channel (PDCCH) resource scheduling the PUSCH UL resource arrives X2 symbols before the SPS PDSCH DL resource; andapplying the second guard band responsively.24.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:determining, by the wireless terminal device, that a Physical Downlink Shared Channel (PDSCH) DL resource for the DL transmission spans across two DL subbands; andapplying the second guard band responsively.25.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:determining, by the wireless terminal device, that a Physical Downlink Control Channel (PDCCH) DL resource for the DL transmission is overlapped with the UL transmission; andapplying the second guard band responsively, wherein a Control Channel Element (CCE) overlapped in both the time domain and the frequency domain with the second guard band is not available for the PDCCH.26.The method according to claim 14,wherein the wireless device is a wireless terminal device, andwherein the method comprises:determining, by the wireless terminal device, that Channel State Information Reference Signal (CSI-RS) DL resource for the DL transmission is overlapped with the UL transmission;applying the second guard band responsively; andgenerating a measurement result for the CSI-RS Dl resource that is overlapped in both the time domain and the frequency domain with the second guard band separately.27.The method according to claim 1, comprising:determining whether to apply a first set of power control parameters or a second set of power control parameters.28.The method according to claim 27, comprising:determining to apply the first set of power control parameters when applying the first guard band, and determining to apply the second set of power control parameters when applying the second guard band.29.The method according to claim 27,wherein the power control parameters comprise at least one of the following:a UE maximum output power;a maximum output power reduction;a configured transmitted power;a Power sharing mode comprising at least one of a semi-static power sharing mode or a dynamic power sharing mode; ora step size for power update triggered by a Transmit Power Control (TPC) command.30.The method according to claim 29, comprising:determining to apply the second guard band; andresponsively activating at least one of the following:a larger UE maximum output power;a smaller maximum output power reduction;a larger configured transmitted power;a dynamic power sharing; ora larger step size for power update triggered by the TPC command.31.The method according to claim 29, comprising:determining to apply the first guard band; andresponsively activating at least one of the following:a smaller UE maximum output power;a larger maximum output power reduction;a smaller configured transmitted power;a semi-static power sharing; ora smaller step size for power update triggered by TPC command.32.The method according to claim 1, comprising:configuring a first Demodulation Reference Signal (DMRS) parameter and a second DRMS parameter; anddetermining to apply the first DMRS parameter in response to determining to apply the first guard band, and determining to apply the second DMRS parameter in response to determining to apply the second guard band.33.The method according to claim 1, comprising:determining to apply the second guard band; andactivating different Demodulation Reference Signal (DMRS) signal location for DL transmissions and UL transmissions.34.The method according to claim 1, comprising:determining to apply the second guard band; andactivating a higher reference signal or reference resource density for the DL transmission or the UL transmission in a time domain or a frequency domain.35.The method according to claim 1, comprising:configuring a first rate-matching pattern and a second rate-matching pattern; anddetermining to apply the first rate-matching pattern in response to determining to apply the first guard band, and determining to apply the second rate-matching pattern in response to determining to apply the second guard band.36.The method according to claim 1, comprising:configuring a first set of frequency hopping parameters and a second set of frequency hopping parameters; anddetermining to apply the first set of frequency hopping parameters in response to determining to apply the first guard band, and determining to apply the second set of frequency hopping parameters in response to determining to apply the second guard band.37.The method according to claim 1, comprising:configuring a first set of beam parameters and a second set of beam parameters; anddetermining to apply the first set of beam parameters in response to determining to apply the first guard band, and determining to apply the second set of beam parameters in response to determining to apply the second guard band.38.The method according to any of claims 1, 6-8, 14-15, 27-37, wherein the wireless device is a wireless access network node.39.The method according to any of claims 1, 6-8, 14-15, 27-37, wherein the wireless device is a wireless terminal device.40.An apparatus for wireless communication comprising a processor that is configured to carry out the method of any of claims 1 to 39.41.A non-transitory computer readable medium having code stored thereon, the code when executed by a processor, causing the processor to implement the method recited in any of claims 1 to 39.
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