Method for inter-rat spectrum sharing
By enabling wireless terminal devices to connect with network nodes using multiple RATs over a shared spectrum resource, the method addresses inefficiencies in spectrum allocation, enhancing utilization and reducing interference.
Patent Information
- Application Number
- PCT/CN2023/134772
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2025-06-05
AI Technical Summary
Current wireless communication networks face challenges in efficiently allocating radio spectrum resources across different radio access technologies (RATs), leading to suboptimal utilization and interference.
The method involves establishing connections between wireless terminal devices and wireless access network nodes using both a first and a second RAT over a shared radio spectrum resource, allowing for channel sharing, control channel sharing, and dynamic scheduling between the RATs.
This approach enhances spectrum utilization efficiency by allowing multiple RATs to share the same spectrum resource, reducing interference, and improving communication flexibility and bandwidth.
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Figure CN2023134772_05062025_PF_FP_ABST
Abstract
Description
METHOD FOR INTER-RAT SPECTRUM SHARINGTECHNICAL FIELD
[0001] This disclosure is directed generally to wireless communication networks and particularly to inter-RAT (radio access technology) spectrum utilization.BACKGROUND
[0002] In wireless access network, various radio access technologies (RATs) may be employed to achieve communications between wireless terminal devices and wireless access network nodes. It is desirable to design the wireless access network such that radio spectrum resources are efficiently allocated for such communications.SUMMARY
[0003] This disclosure is directed generally to wireless communication networks and particularly to inter-RAT (radio access technology) spectrum utilization.
[0004] In one example implementation, a method performed by a wireless terminal device is disclosed. The method may include establishing connection with at least one wireless access network nodes via both a first radio access technology (RAT) and a second RAT over at least one radio spectrum resource, the second RAT being distinct with the first RAT and each of the at least one radio spectrum resource comprises a pre-configured radio spectral range; and using the at least one radio spectrum resource for the first RAT and the second RAT.
[0005] In the example implementation above, the at least one radio spectrum resource comprises one pre-configured radio spectral range shared by the first RAT and the second RAT.
[0006] In any one of the example implementations above, using the one pre-configured radio spectral range for the first RAT and the second RAT comprises using the one pre-configured radio spectral range for communication with a first cell and a second cell based on the first RAT and the second RAT, respectively, the first cell and the second cell belonging to different cell groups or being distinct and belonging to a same cell group.
[0007] In any one of the example implementations above, using the one pre-configured radio spectral range for the first RAT and the second RAT comprises using the one pre-configured radio spectral range for communicating with a single cell supporting both the first RAT and the second RAT.
[0008] In any one of the example implementations above, using the one pre-configured radio spectral range for the first RAT and the second RAT comprises channel sharing between the first RAT and the second RAT.
[0009] In any one of the example implementations above, using the one pre-configured radio spectral range for the first RAT and the second RAT comprises sharing at least one control channel between the first RAT and the second RAT.
[0010] In any one of the example implementations above, the first RAT comprises a 6G RAT, and the second RAT comprises a 4G or 5G RAT; and the at least one control channel shared between the first RAT and the second RAT comprises a 6G control channel.
[0011] In any one of the example implementations above, the at least one control channel shared between the first RAT and the second RAT is configured for receiving a downlink control information (DCI) defined in both the first RAT and the second RAT.
[0012] In any one of the example implementations above, a capability of blind detection of the DCI by the wireless terminal device is counted towards one of the first RAT and the second RAT or both of the first RAT and the second RAT with a scaling factor.
[0013] In any one of the example implementations above, control information carried in the at least one control channel shared by the first RAT and the second RAT comprises a RAT flag for indicating which of the first RAT and the second RAT is the control information for.
[0014] In any one of the example implementations above, control messages carried in the at least one control channel shared by the first RAT and the second RAT are constructed with a size to accommodate formats of both a first predefined control information size of the first RAT and a second predefined control information size of the second RAT, and are padded with zero bits when carrying the control messages comprising a shorter of the first predefined control information size and the second predefined control information size.
[0015] In any one of the example implementations above, using the one pre-configured radio spectral range for the first RAT and the second RAT comprises resource sharing between the first RAT and the second RAT.
[0016] In any one of the example implementations above, resources of the first RAT shared with the second RAT is indicated by a control channel of the first RAT.
[0017] In any one of the example implementations above, the first RAT is a 6G RAT and the second RAT is a 4G or 5G RAT.
[0018] In any one of the example implementations above, the at least one radio spectrum resource comprises a first pre-configured radio spectral range and a second pre-configured spectral range used by the first RAT and the second RAT.
[0019] In any one of the example implementations above, downlink spectral resources of the first pre-configured radio spectral range and / or the second pre-configured spectral range are dynamically scheduled by single DCI.
[0020] In any one of the example implementations above, a RAT of the single DCI is determined by the wireless terminal device via blind detection or is pre-configured.
[0021] In any one of the example implementations above, at least one RAT specific field or RAT common field of the first RAT and the second RAT is included in the single DCI.
[0022] In any one of the example implementations above, hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback associated with the first RAT and the second RAT are grouped in one codebook.
[0023] In another example implementations, a method performed by a wireless access network node is disclosed. The method may include establishing connection with a wireless terminal device via both a first radio access technology (RAT) and a second RAT over at least one radio spectrum resource, the second RAT being distinct with the first RAT and each of the at least one radio spectrum resource comprises a pre-configured radio spectral range; and using the at least one radio spectrum resource for the first RAT and the second RAT for communication with the wireless terminal device.
[0024] The wireless terminal device or the wireless access network node of any one of the methods above is further disclosed. The wireless terminal device or the wireless access network node may include a processor and a memory, wherein the processor is configured to read computer code from the memory to cause the wireless terminal device or the wireless access network node to perform the method of any one of the methods above.
[0025] A non-transitory computer-readable program medium with computer code stored thereupon is further disclosed. The computer code, when executed by a processor of the wireless terminal device or the wireless access network node of any one of the methods above, is configured to cause the processor to implement any one of the methods above.
[0026] The above embodiments and other aspects and alternatives of their implementations are described in greater detail in the drawings, the descriptions, and the claims below.BRIEF DESCRIPTION OF THE DRAWINGS
[0027] FIG. 1 illustrates an example wireless communication network including a wireless access network, a core network, and data networks.
[0028] FIG. 2 illustrates an example wireless access network including a plurality of mobile stations / terminals or User Equipments (UEs) and a wireless access network node in communication with one another via an over-the-air radio communication interface.
[0029] FIG. 3 shows an example radio access network (RAN) architecture.
[0030] FIG. 4 shows an example communication protocol stack in a wireless access network node or wireless terminal device including various network layers.
[0031] FIG. 5 shows an example core network.
[0032] FIG. 6 shows an example implementation for inter-RAT spectrum utilization.
[0033] FIG. 7 shows another example implementation for inter-RAT spectrum utilization.
[0034] FIG. 8 shows yet another example implementation for inter-RAT spectrum utilization.
[0035] FIG. 9 illustrates an example scheme for control channel sharing between different RATs.
[0036] FIG. 10 illustrates an example cell free system.
[0037] FIG. 11 illustrates an example spectrum utilization scheme in the cell free system of FIG. 10.
[0038] FIG. 12 illustrates another example spectrum utilization scheme in the cell free system of FIG. 10.DETAILED DESCRIPTION
[0039] The technologies described in this disclosure can be used for implement inter-RAT spectrum sharing in wireless access systems. The term “over-the-air interface” is used interchangeably with “air interface” or “radio interface” in this disclosure. 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.
[0040] In this disclosure, unified as well as specific schemes for inter-RAT spectrum utilization are described. Merely as examples, the various RATs may include but are not limited to LTE, NR, 6G, and any current and other future mobile communication technologies. Such inter-RAT spectrum sharing may be achieved via dynamic resource provisioning across RATs, across frequencies (e.g., carriers) and / or cross cells for a particular wireless terminal device or UE in forms of dual connection (DC) and / or carrier aggregation (CA) .
[0041] Wireless Communication Networks
[0042] An example wireless communication network, shown as 100 in FIG. 1, may include wireless terminal devices or user equipment (UE) 110, 111, and 112, a carrier network 102, various service applications 140, and other data networks 150. The wireless terminal devices or UEs, may be alternatively referred to as wireless terminals. The carrier network 102, for example, may include access network nodes 120 and 121, and a core network 130. The carrier network 110 may be configured to transmit voice, data, and other information (collectively referred to as data traffic) among UEs 110, 111, and 112, between the UEs and the service applications 140, or between the UEs and the other data networks 150. The access network nodes 120 and 121 may be configured as various wireless access network nodes (WANNs, alternatively referred to as wireless base stations) to interact with the UEs on one side of a communication session and the core network 130 on the other. The term “access network” may be used more broadly to refer a combination of the wireless terminal devices 110, 111, and 112 and the access network nodes 120 and 121. A wireless access network may be alternatively referred to as Radio Access Network (RAN) . The core network 130 may include various network nodes configured to control communication sessions and perform network access management and traffic routing. The service applications 140 may be hosted by various application servers deployed outside of but connected to the core network 130. Likewise, the other data networks 150 may also be connected to the core network 130.
[0043] In the example wireless communication network of 100 of FIG. 1, the UEs may communicate with one another via the wireless access network. For example, UE 110 and 112 may be connected to and communicate via the same access network node 120. The UEs may communicate with one another via both the access networks and the core network. For example, UE 110 may be connected to the access network node 120 whereas UE 111 may be connected to the access network node 121, and as such, the UE 110 and UE 111 may communicate to one another via the access network nodes 120 and 121, and the core network 130. The UEs may further communicate with the service applications 140 and the data networks 150 via the core network 130. Further, the UEs may communicate to one another directly via side link communications, as shown by 113.
[0044] FIG. 2 further shows an example system diagram of the wireless access network 120 including a WANN 202 serving UEs 110 and 112 via the over-the-air interface 204. The wireless transmission resources for the over-the-air interface 204 include a combination of frequency, time, and / or spatial resource. Each of the UEs 110 and 112 may be a mobile or fixed terminal device installed with mobile access units such as SIM / USIM modules for accessing the wireless communication network 100. The UEs 110 and 112 may each be implemented as a terminal device including but not limited to a mobile phone, a smartphone, a tablet, a laptop computer, a vehicle on-board communication equipment, a roadside communication equipment, a sensor device, a smart appliance (such as a television, a refrigerator, and an oven) , or other devices that are capable of communicating wirelessly over a network. As shown in FIG. 2, each of the UEs such as UE 112 may include transceiver circuitry 206 coupled to one or more antennas 208 to effectuate wireless communication with the WANN 120 or with another UE such as UE 110. 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 methods described herein.
[0045] Similarly, the WANN 120 may include a wireless base station or other wireless network access point capable of communicating wirelessly via the over-the-air interface 204 with one or more UEs and communicating with the core network 130. For example, the WANN 120 may be implemented, without being limited, in the form of a 2G base station, a 3G nodeB, an LTE eNB, a 4G LTE base station, a 5G NR base station of a 5G gNB, a 5G central-unit base station, or a 5G distributed-unit base station. Each type of these WANNs may be configured to perform a corresponding set of wireless network functions. The WANN 202 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 UEs 110 and 112. 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 of the WANN 120 described herein.
[0046] Data packets in a wireless access network such as the example described in FIG. 2 may be transmitted as protocol data units (PDUs) . The data included therein may be packaged as PDUs at various network layers wrapped with nested and / or hierarchical protocol headers. The PDUs may be communicated between a transmitting device or transmitting end (these two terms are used interchangeably) and a receiving device or receiving end (these two terms are also used interchangeably) once a connection (e.g., a radio link control (RRC) connection) is established between the transmitting and receiving ends. Any of the transmitting device or receiving device may be either a wireless terminal device such as device 110 and 120 of FIG. 2 or a wireless access network node such as node 202 of FIG. 2. Each device may both be a transmitting device and receiving device for bi-directional communications.
[0047] The core network 130 of FIG. 1 may include various network nodes geographically distributed and interconnected to provide network coverage of a service region of the carrier network 102. These network nodes may be implemented as dedicated hardware network nodes. Alternatively, these network nodes may be virtualized and implemented as virtual machines or as software entities. These network nodes may each be configured with one or more types of network functions which collectively provide the provisioning and routing functionalities of the core network 130.
[0048] Returning to wireless radio access network (RAN) , FIG. 3 illustrates an example RAN 340 in communication with a core network 310 and wireless terminals UE1 to UE7. The RAN 340 may include one or more various types of wireless base station or WANNs 320 and 321 which may include but are not limited to gNB, eNodeB, NodeB, or other type of base stations (for simplicity, only gNBs are illustrated in FIG. 3) . The RAN 340 may be backhauled to the core network 310 via, for example, NG interfaces.
[0049] The WANNs may of FIG. 3 may be configured to communicate with one another via inter-node interfaces. For example, the gNBs may communicate with one another via an Xn interface. For another example, 5G base stations gNBs may communicate with LTE base stations such as NodeBs or eNodeBs via an X2 interface. In some example implementations, the WANN 320, for example, may further include multiple separate access network nodes in the form of a Central Unit (CU) 322 and one or more Distributed Units (DUs) 324 and 326. In some embodiments, the CU may be a gNB Central Unit (gNB-CU) , and the DU may be a gNB Distributed Unit (gNB-DU) . The CU 322 may be connected with DU1 324 and DU2 326 via various inter-node interfaces, for example, an F1 interface. Each of the various inter-node interfaces, may further be delineated into a control-plane interface and a user-plane interface. For a specific example, the F1 interface between a CU and a DU may further include an F1-C interface and an F1-U interface, which may be used to carry control plane information and user plane data, respectively. Likewise, the Xn or X2 interfaces may include an Xn-C and Xn-U or X2-C and X2-U interfaces. For purpose of this disclosure and the claims thereof, each CU and DU are considered separate access network node. The F1 interface thus falls within a definition of inter-node communication interface. In addition, while the various implementations described below are provided in the context of a 5G cellular wireless network, the underlying principles described herein are applicable to other types of radio access networks including but not limited to other generations of cellular network, as well as Wi-Fi, Bluetooth, ZigBee, and WiMax networks.
[0050] The UEs may be connected to the network via the WANNs 320 over an air interface. The UEs may be served by at least one cell. Each cell is associated with a coverage area. These cells may be alternatively referred to as serving cells. The coverage areas between cells may partially overlap. Each UE may be actively communicating with at least one cell while may be potentially connected or connectable to more than one cell. In the example of FIG. 1, UE1, UE2, and UE3 may be served by cell1 330 of the DU1, whereas UE4 and UE5 may be served by cell2 332 of the DU1, and UE6 and UE7 may be served by cell3 associated with DU2. In some implementations, a UE may be served simultaneously by two or more cells. Each of the UE may be mobile and the signal strength and quality from the various cells at the UE may depend on the UE location and mobility.
[0051] In some example implementations, the cells shown in FIG. 3 may be alternatively referred to as serving cells. The serving cells may be grouped into serving cell groups (CGs) . A serving cell group may be either a Master CG (MCG) or Secondary CG (SCG) . Within each type of cell groups, there may be one primary cell and one or more secondary cells. A primary cell in a MSG, for example, may be referred to as a PCell, whereas a primary cell in a SCG may be referred to as PScell. Secondary cells in either an MCG or an SCG may be all referred to as SCell. The primary cells including PCell and PScell may be collectively referred to as spCell (special Cell) . All these cells may be referred to as serving cells or cells. The term “cell” and “serving cell” may be used interchangeably in a general manner unless specifically differentiated. The term “serving cell” may refer to a cell that is serving, will serve, or may serve the UE. In other words, a “serving cell” may not be currently serving the UE. While the various embodiment described below may at times be referred to one of the types of serving cells above, the underlying principles apply to all types of serving cells in both types of serving cell groups.
[0052] FIG. 4 further illustrates a simplified view of the various network layers involved in transmitting user-plane PDUs from a transmitting device 402 to a receiving device 404 in the example wireless access network of FIGS. 1 to 3. FIG. 4 is not intended to be inclusive of all essential device components or network layers for handling the transmission of the PDUs. FIG. 4 illustrates that the data packaged by upper network layers 420 at the transmitting device 402 may be transmitted to corresponding upper layer 430 (such as radio resource control or RRC layer) at the receiving device 304 via Packet Data Convergence Protocol layer (PDCP layer, not shown in FIG. 4) and radio link control (RLC) layer 422 and of the transmitting device, the physical (PHY) layers of the transmitting and receiving devices and the radio interface, as shown as 406, and the media access control (MAC) layer 434 and RLC layer 432 of the receiving device. Various network entities in each of these layers may be configured to handle the transmission and retransmission of the PDUs.
[0053] In FIG. 4, the upper layers 420 may be referred as layer-3 or L3, whereas the intermediate layers such as the RLC layer and / or the MAC layer and / or the PDCP layer (not shown in FIG. 4) may be collectively referred to as layer-2, or L2, and the term layer-1 is used to refer to layers such as the physical layer and the radio interface-associated layers. In some instances, the term “low layer” may be used to refer to a collection of L1 and L2, whereas the term “high layer” may be used to refer to layer-3. In some situations, the term “lower layer” may be used to refer to a layer among L1, L2, and L3 that are lower than a current reference layer. Control signaling may be initiated and triggered at each of L1 through L3 and within the various network layers therein. These signaling messages may be encapsulated and cascaded into lower layer packages and transmitted via allocated control or data over-the-air radio resources and interfaces. The term “layer” generally includes various corresponding entities thereof. For example, a MAC layer encompasses corresponding MAC entities that may be created. The layer-1, for example, encompasses PHY entities. The layer-2, for another example encompasses MAC layers / entities, RLC layers / entities, service data adaptation protocol (SDAP) layers and / or PDCP layers / entities.
[0054] FIG. 5 shows an example division of network node functions in the core network 130. While only single instances of network nodes for some functions are illustrated in FIG. 5, those having ordinary skill in the art understand that each of these network nodes may be instantiated as multiple instances that are distributed throughout the core network 130. As shown in FIG. 5, the core network 130 may include but are not limited to access management network function (AMF) nodes 530, session management function (SMF) nodes 540, user plane function (UPF) nodes 550, policy control function (PCF) nodes 520, and application data management function (AF) nodes 510.
[0055] The AMF nodes 530 may communicate with the access network 120, the SMF nodes 540, and the PCF nodes 520 respectively via communication interfaces 522, 532, and 524, and may be responsible for provisioning registration, authentication, and access by the UE to the core network 130 was well as allocation of SMF nodes 540 to support particular UE communication sessions. The SMF nodes 540 allocated by the AFM nodes 530 may in turn may be responsible for allocating UPF nodes 550 for supporting the particular UE communication session and control these allocated UPF nodes 550 via communication interface 546. Alternatively, or additionally in some implementations, the UPF nodes 550 may be directly allocated by the AMF nodes 530 via the interface 534 and controlled by the SMF nodes 540 via the communication interface 546. Access policies and session routing policies applicable to the UEs may be managed by the PCF nodes 520 which communicate the policies to the AMF nodes 530 and the SMF nodes 540 via communication interfaces 524 and 523, respectively. The PCF nodes 520 may be further responsible for managing user subscription 512 to service application 140 via the AF nodes 510. The signaling and data exchange between the various types of network nodes through various communication interfaces indicated by the various connection lines in FIG. 5, may be carried by signaling or data messages following predetermined types of format or protocols.
[0056] To support a particular end-to-end communication task requested by a UE, a communication session may be established to support a data traffic pipeline for transporting the particular end-to-end data communication traffic. The carrier network portion of the data traffic pipeline, as illustrated by 570 of FIG. 5, may involve one or more network nodes in the access network 120 and a set of UPF nodes 552, 554, and 556 in the core network 130, as selected and controlled, for example, by a set of SMF nodes 542 and 544 which may be selected and controlled by the AMF nodes 530 that are responsible for establishing and managing the communication session. Data traffic is routed among a UE at one end of the data traffic pipeline, the carrier network portion of the data traffic pipeline (including the set of network nodes in the access network 120 and the selected UPF nodes 552, 554, and 556 in the core network 130) , and another end of the data traffic pipeline including, for example, another UE, a service application or application server 140, or a data network 150, via communication interfaces such as 524, 558, and 559.
[0057] Wireless Network Generations, Wireless Spectrum Sharing, and Cross-Carrier Scheduling
[0058] Configuration and usage of wireless spectrum has always been essential to the development and progression of various generation of cellular and cell free wireless access systems. The more recent 5th Generation (5G) mobile communication technology or future 6th Generation (6G) mobile communication technology are facing high demands. Based on the current development, 5G systems are also beginning to support additional enhanced mobile broadband (eMBB) , ultra-reliable low-latency communication (URLLC) , and massive machine-type communication (mMTC) . As new access features and technologies are being developed and adopted within each generation of wireless systems or across to newer generation of wireless systems, it has become essential to reuse wireless spectrum resources used in a previous generation via new resource allocation and scheduling schemes, such that the wireless spectrum resources are shared between generations of wireless technologies in order to improve the efficiency of wireless spectrum utilization.
[0059] For example, in 5G mobile communication technology, alternatively referred to as New Radio (NR) , dynamic spectrum sharing (DSS) with 4th Generation mobile communication technology (4G) Long-Term Evolution (LTE) have been developed and employed. In some example implementations of LTE-NR spectrum sharing, part of the LTE spectral resources may be carved out for NR communications. However, the NR Physical Downlink Control Channel (PDCCH) , Physical Downlink Shared Channel (PDSCH) may not be permitted be sent on the resources of LTE PDCCH and Cell-specific Reference Signal (CRS) to avoid advertent impacts on the LTE system.
[0060] In some implementations, wireless spectrum may be utilized in units of carriers or sub-carriers for communications between wireless terminal devices and access network nodes. When multiple carriers or sub-carriers are used to support communication of a single mobile terminal device, inter-carrier resource scheduling may be implemented for reducing scheduling overhead, thereby improving resource utilization efficiency. For example, a PCell and an SCell in NR may utilized different wireless carriers. When supporting communications of a UE, NR PDCCH enhancements for intra-RAT cross-carrier scheduling including scheduling of PDSCH or PUSCH on PCell via PDCCH of SCell may be been introduced for offloading the PCell PDCCH.
[0061] In the further disclosure below, unified as well as specific schemes for inter-RAT spectrum utilization or sharing are described. Merely as examples, the various RATs may include but are not limited to LTE (4G) , NR (5G) , 6G, and any current and other future mobile communication technologies. Such inter-RAT spectrum utilization or sharing may be achieved via semi-static and / or dynamic resource provisioning across RATs, across frequencies (e.g., carriers) and / or cross cells for a particular wireless terminal device or UE in forms of dual connection (DC) and / or carrier aggregation (CA) .
[0062] In the disclosure below, the term “spectrum resource” may be used to refer to a radio spectral range predefined, pre-configured, or otherwise allocated in the over-the-air interface. As an example, A spectrum resource may include one or more predetermined, pre-configured, or allocated wireless carriers or sub carriers. As another example, a spectrum resource, for example may refer to one of frequency range 1 (FR1) and frequency range 2 (FR2) , and other wireless communication bands and / or band combinations. A spectral resource may be licensed or non-licensed. A cell may utilize a single carrier or a combination of carriers. The term “spectrum resource” may be interchangeably used with “spectral resource” , “frequency range” , and the like. Sharing of the spectrum resource by different cells or different RATs may include sharing in either or both of frequency and time at various granularity levels (e.g., resource blocks, channel, sub-carrier, carrier or other levels in frequency, or frame, subframe, slot, and symbol in time) .
[0063] Further in the disclosure below, the term “dynamic” (such as in “dynamic scheduling” , “dynamic spectrum sharing” , and the like may be used to refer to resource provisioning that occurs within a communication session, such as downlink resource scheduling via downlink control information. A resource allocation by radio resource control (RRC) information elements, for example, may be considered as static rather than dynamic provisioning.
[0064] Dynamic Inter-RAT Spectrum Sharing
[0065] In applying dynamic spectrum sharing (DSS) , re-farming of spectrum allocated to a first RAT technology (e.g., 6G technologies, may be referred to as current technology) for use by a second RAT (e.g., 4G / 5G technology, may be referred to as legacy technologies) may be implemented. In other words, spectrum sharing among radios of the first RAT may be shared with the second RAT in a dynamic manner.
[0066] In some example implementations, referred to as option 1 below, a same spectrum resource may be used or shared by different RATs for a same UE. Such spectrum resource sharing may be provisioned semi-statically or dynamically. For a specific example, as shown in FIG. 6, a same frequency resource at f1 (e.g., a carrier on a band) can be configured as shared by a first cell 602 of a first RAT, e.g., 6G RAT, and a second cell 604 of a second RAT, e.g., 4G / 5G RAT, for a particular wireless terminal device 606, e.g., UE1. The dynamic resource sharing may be provisioned by wireless access network node 610, which may be configured to support both the first RAT and the second RAT.
[0067] In some other alternative example implementations, referred to as option 2 below, a same spectrum resource may be used and shared by different RATs for providing services to different UEs, such that the same UE does not communicate with more than one RAT on a same spectrum resource. The same UE, however, can use two or more different RATs on different spectral resources in a multi connectivity (e.g., dual connectivity, or DC) configuration to enhance overall communication bandwidth. In other words, the same UE may not access the same spectrum resource from different RATs but the same spectrum resource may be dynamically shared by different RATs communicating with different UEs.
[0068] As shown in the example of FIG. 7 for option 2, a same frequency resource at f1 can be configured for use by a first cell 702 of a first RAT (e.g., 6G RAT) for a first UE 706 (UE1) and a second cell 704 of a second RAT (e.g., 4G / 5G RAT) for a second UE 708 (UE2) (in other words, different UEs share the same spectrum resource using different RATs) . The dynamic resource sharing may be provisioned by wireless access network node 710, which may be a single wireless access network node configured to support both the first RAT and the second RAT (e.g., a 6G / 5G / 4G NodeB) or separate wireless network nodes configured to support the first RAT and the second RAT (e.g., a 6G NodeB and a 4G / 5G NodeB) .
[0069] As further shown in FIG. 7 for option 2 above, a same UE1 can communicate at different frequency resources in a first RAT (e.g., 6G RAT) and another RAT (e.g., 4G / 5G RAT) . Such different frequency resources together may be considered as shared by the first RAT and the other RAT. Such sharing, again, may be provisioned dynamically. Specifically, as shown in FIG. 7, different frequency resources f1 and f2 may be associated with a first cell 702 of a first RAT (e.g., 6G RAT) and another cell 705 of the other RAT (e.g., 4G / 5G RAT) and used for communication with the same UE 706 (UE1) , respectively. The first cell 702 and the other cell 705 may be provided by wireless access network node (s) 710 and 712, respectively, and in such a manner, the same UE 706 (UE1) may use the frequency resources f1 and f2 to connect to the first cell 702 and the other cell 705 via a DC (dual connectivity) mechanism.
[0070] As further shown in FIG. 8, when different frequency resources at f1 and f2 are respectively used for the first cell 802 and the other cell 805 by a same wireless access network node 810, the utilization of f1 and f2 may be configured to provide communications to the same UE 806 via an inter-RAT Carrier Aggregation (CA) .
[0071] In some example implementations of option 1, the same spectrum resource may be used for different cells corresponding to different RATs for a same UE and the different cells may be associated to different cell groups. For example, a same frequency resource f1 may be configured with a cell number (or a cell ID, e.g., cell #n) belonging to cell group #1 associated with the first RAT (e.g., 6G RAT) , while the same frequency resource f1 can be also configured with a cell number (e.g., cell #m) belonging to cell group #2 associated with the second RAT (e.g., 4G / 5G RAT) and different from cell group #1. In such a configuration, DSS may be achieved via DC. In other words, the same UE may be connected to different cells of different cell groups via different RATs at the same time using the same frequency resource dynamically shared via DSS between the different RATs.
[0072] In some alternative example implementations of option 1, the same spectrum resource may be used for different cells corresponding to different RATs for the same UE, and the different cells may be associated with a same cell group but with different cell numbers or cell IDs. For example, a same frequency resource f1 may be configured as cell #n belonging to cell group #1 associated with the first RAT (e.g., 6G RAT) , whereas the same frequency resource f1 may be also configured as cell #m (m≠n) also belonging to cell group #1 but associated with the second RAT (e.g., 4G / 5G RAT) . In such a manner, the same frequency resources may be dynamically shared via DSS in a same cell group between different cells of different RATs via a carrier aggregation mechanism in which the shared frequency resources may be treated as aggregated carriers.
[0073] In yet some other alternative example implementations of option 1 above, the same spectrum resource may be used for a same cell corresponding to and supporting multiple different RATs for a same UE. For example, a same frequency resource f1 may be configured as cell #n associated with and supporting both the first RAT (e.g., 6G RAT) and the second RAT (e.g., 4G / 5G RAT) . In some example implementations, the same frequency resource f1 may be provisioned between the first RAT (e.g., 6G RAT) and the second RAT (e.g., 4G / 5G RAT) in either a semi-static manner or dynamic manner. For example, the same frequency resource f1 may be used for the first RAT (e.g., 6G RAT) and the second RAT (e.g., 4G / 5G RAT) with semi-statically configured different subband resources in the frequency resource f1 with or without overlapping. For another example, the same frequency resource f1 can be used for the first RAT (e.g., 6G RAT) and the second RAT (e.g., 4G / 5G RAT) by dynamic scheduling. Specifically, the same frequency resource f1 may be used for the first RAT (e.g., 6G RAT) and the second RAT (e.g., 4G / 5G RAT) by dynamic or semi-static switching or using a target RAT applied in the same frequency resource or the same cell.
[0074] In the various example implementations of option 1 above, a same frequency resource may be applied for and shared by different RATs for a same UE. Traffic of different RATs can thus be transmitted simultaneously on the same frequency resource for the same UE for beneficially achieving higher efficiency in wireless spectrum utilization. Cross RATs scheduling for the same frequency resource may also be achieved to provide enhanced resource scheduling flexibility from the network side.
[0075] Example manners in which the same spectrum resource may be shared by different RATs for the same UE (option 1 above) are further described below. In some example spectrum resource sharing implementations of option 1, inter-RAT sharing of the same spectrum resource for the same UE may be achieved by channel or resource sharing. At least one of following alternatives can be implemented for channel or resource sharing.
[0076] In a first example alternative implementation for channel / resource sharing for option 1, control channels within the same spectrum resource may be shared between the different RATs. Such control channels may be used for scheduling of resources within the same spectrum resource. As such, the spectrum resource may be scheduled between the different RATs by control information transmitted in the shared control channel within the same spectrum resource. For example, as shown in FIG. 9, control channel (s) shared / used for different RATs can be located in the front of a time slot and the scheduling of the resource for the data traffic of the different RATs (e.g., the first RAT, e.g., 6G RAT, and the second RAT, e.g., 4G / 5G RAT) in the later portion of a time slot may be based on the scheduling by the shared control channel. In FIG. 9, the horizontal direction and the vertical direction are associated with time and frequency, respectively.
[0077] The shared control channel above, for example, may be a control channel associated with one of the first RAT and the second RAT. For example, for spectrum sharing between 6G RAT and the 4G / 5G RAT, the shared control channel may be associated with the 6G RAT. The control channel, e.g., a downlink control channel, may be used to send DCI defined based on all RATs sharing the spectrum resource (e.g., 6G RAT and 4G / 5G RAT) . In some example implementations, the capability on blind decoding of the shared control channel may be counted in only one of the RATs, e.g., 6G RAT. Alternatively, the capability on blind decoding of the shared control channel may be counted in different RATs with corresponding scaling factors.
[0078] In some example implementations of control channel sharing where the multiple RATs sharing the spectrum resource include 5G RAT, the shared control channel may be one or more NR PDCCHs, which may be used to transmit DCIs defined according to the multiple RATs. For example, partial or all NR PDCCHs used for control channel sharing may be located in partial control resource sets and search spaces.
[0079] In some example implementations of control channel sharing where the multiple RATS sharing the spectrum resource includes LTE, the shared control channel may be one or more LTE PDCCHs, which may be used to transmit DCIs defined according to the multiple RATs. For example, partial or all LTE PDCCHs used for control channel sharing may be located in partial search spaces. In some implementations, the network may be updated to support using legacy RAT channel to transmit control information associated with later different RATs.
[0080] In some example implementations, various aspects or constraints on the application of shared control channel may be employed. These aspects or constraints may include one or more of following non- limiting items:
[0081] ·The control information in the shared control channel may include a RAT flag indication, which may be used to determine interpretation of other fields in the DCI. Such RAT flag, for example, may indicate which RAT does the particular control information apply to.
[0082] ·The size of the shared DCI format for transmission in the shared control channel may be determined by the maximum size of DCI formats of the various RATs, and when transmitting DCI for a RAT with a shorter format, the extra bits in the shared DCI format may be zero padded.
[0083] ·Partially shared control channel may be used for different RATs, wherein the partial parameters / resources of the control channel shared towards, for example, NR PDCCH, may be transmitted by using different MIMO layer or different control channel resources compared with the underlying control channel (e.g., 6G control channel) for transmission.
[0084] ·The control information in the shared control channel may schedule multiple traffic channels of multiple RATs, wherein the multiple traffic channels of multiple RATs could be distinguished by at least one of time / frequency / code domain resources.
[0085] In a second example alternative implementation for channel / resource sharing for option 1, other resources may be shared between the different RATs. Such resources being shared may broadly include but are not limited to frequency, time, and other network resources in various network layers. For example, the shared resources may include part of resources allocated to the first RAT (e.g., 6G RAT) , which can be used to send channel / signal (e.g., control channel) of the second RAT (e.g., 4G / 5G RAT) . In some implementations, the shared resources of the first RAT used for transmitting / receiving the various signal / channel of the second RAT may be indicated by control channel (s) of the first RAT. In some implementations, such partial resources for sharing may be determined based on network configuration, or based on indication of signal / channel of the first RAT. For example, the UE may receive the signal / channel of the second RAT (e.g., 6G RAT) based on such network configuration or such indication in the signal / channel of the first RAT (e.g., 6G RAT) . In some example implementations, such configuration or indication may include information related to when / where / how to receive the signal / channel of the second RAT, e.g., such configuration or indication may instruct the UE to receive PDCCH of the second RAT (e.g., NR, or 4G / 5G RAT) in configured / indicated resources in every time slot.
[0086] In a third example alternative implementation for channel / resource sharing for option 1 above, synchronization / broadcast channel sharing between the various RATs may be employed. For example, during initial access of the UE to the network, only a single RAT may be accessed, or multiple RATs may alternatively be accessed with synchronization / broadcast channel sharing. In case multiple RATs are accessed, information of one of the multiple RATs may be carried on synchronization or broadcast channel (s) which is used to indicate using the channel of one RAT to access. In some example implementations, same spectrum resource can be used for a same cell corresponding to different RATs for a same UE. In some example implementations, one of the multiple RATs may be configured on the same spectrum resource.
[0087] In a fourth example alternative implementation for channel / resource sharing for option 1, traffic channel sharing between the various RATs may be employed. For example, dynamic scheduling may be implemented to indicate that traffic of one of the multiple RATs may be transmit on the shared traffic channel (s) . In case of configured grant or grant free transmission on the shared traffic channel (s) , traffic of one of the multiple RATs to be transmitted can be determined by priority rule or reference signal. For example, the priority of the second RAT (e.g., legacy 4G / 5G RAT) may be higher or lower than that of the first RAT (e.g., current / new 6G RAT) . For another example, the reference signal of different RATs can be detected or distinguished by network or UE.
[0088] In some other example spectrum resource sharing implementations of option 1 above, in which the same spectrum resource is shared for different RATs for the same UE, the different RATS may be associated with the same hybrid automatic repeat request (HARQ) entities or different HARQ entities.
[0089] For example, the same spectrum resource used for the different RATs may be associated with different cells. In some implementations, each HARQ entity may be associated with a cell, and different HARQ entities may be associated with different RATs. Alternatively, a same HARQ entity may be used for different RATs and different HARQ entities for different RATs may not be supported. In some implementations, a HARQ process number pool may be shared or divided for different RATs. In some implementations, when same channel coding and modulation schemes are used, different HARQ entities for different RATs may be supported.
[0090] For another example, the same spectrum resource used for different RATs may be associated with a same cell. In some implementations, a HARQ entity may be associated with the cell, and the HARQ entity may be further associated with different RATs. In some other implementations, different HARQ entities may be used for different RATs for the same cell.
[0091] In yet some other example spectrum resource sharing implementations of option 1 above, in which the same spectrum resource is shared for different RATs for the same UE, the inter-RAT sharing of the spectrum resource may involve uplink sharing. Several example alternative implementations are provided below for uplink sharing.
[0092] In the first example alternative implementation for uplink sharing, where the same spectrum resource shared by different RATs is associated with different cells, message 1 and / or message 3 of a random-access process may be accessed by only one RAT or one cell, wherein the one RAT or one cell may be predefined or determined by configuration or dynamic selection. In some example implementations, physical uplink control channel (PUCCH) may be RAT specific, or the PUCCH of the first RAT (e.g., 6G RAT) could be compatible with PUCCH of the second RAT (e.g., 4G / 5G RAT) , which may be shared and used for, e.g., transmission of HARQ-ACK (HARQ -Acknowledgement) feedback of the second RAT (e.g., 4G / 5G RAT) .
[0093] In the second example alternative implementation for uplink sharing, where the same spectrum resource shared by different RATs are associated with a same cell, the UL signal / channel may be associated with different RATs. In some implementations, different UL signals / channels may be used for different RATs. In some implementations, UL signals / channels of the first RAT (e.g., 6G RAT) may be compatible with same type of signals / channels of the second RAT (e.g., 4G / 5G RAT) .
[0094] In the various example implementations of option 1 above, a same frequency resource may be applied for and shared by different RATs for a same UE. Traffic of different RATs can thus be transmitted simultaneously on the same frequency resource for the same UE for beneficially achieving higher efficiency in wireless spectrum utilization. Cross RATs scheduling for the same frequency resource may also be achieved to provide enhanced resource scheduling flexibility from the network side.
[0095] The various implementations above described for inter-RAT spectrum resource sharing under option 1 may not be limited to option 1. For example, these various example implementations may be applicable to option 2 for inter-RAT spectrum resource sharing above and described further below.
[0096] Example manners in which the same spectrum resource is shared between different RATs for different UEs (option 2, left branch of FIG. 7) , i.e., different spectrum resources are used for different RATs for a same UE (option 2, upper branch of FIG. 7) may include detailed implementation with respect to scheduling of the different spectrum resources used for different RATs for the UEs.
[0097] In some example implementations of option 2 for spectrum resource sharing, the different spectrum resources used for different RATs for a same UE may be scheduled by each RAT independently.
[0098] In some other alternative example implementations, the different spectrum resources used for different RATs for a same UE may be jointly scheduled by single DCI. Such joint scheduling may be implemented in several different alternative manners as described below.
[0099] In a first alternative example manner for joint scheduling by a single DCI, a target RAT of the single DCI may be determined by blind detection by the UE or may be predefined or may be determined by configuration. For example, in case that the target RAT of single DCI is not known by the UE, the UE may blind detect the potential RATs according to parameters configured for different RATs in predefined / configured shared / independent resources. For another example, in case that the RAT of single DCI is known by the UE, the UE may blind detect the potential DCI according to parameters configured for the known RAT (e.g., 6G RAT as a new RAT as opposed to a legacy RAT, e.g., 4G / 5G RAT) in predefined / configured resources.
[0100] In a second alternative example manner for joint scheduling by a single DCI, at least one RAT-specific or common field may be included in the single DCI. For example, the at least one RAT common field may include a field with a type which can be applied for all RATs of one RAT group. For example, the at least one RAT common field may include a DL or UL flag indication. For another example, the at least one RAT common field may include a field corresponding to different field types which can be applied for all RATs with multiple groups, e.g., for a field, one group for different cells for 4G / 5G with a type, the other group for different cells for 6G with another type. For example, frequency domain resource allocation field for group#1 may be associated with cell#1 and cell#2 for 4G / 5G and may be type 2 field which may be a non-shared indication; frequency resource allocation field for group#2 may be associated with cell#3 and cell#4 for 6G and may be type 1A field which may be a shared indication. For another example, the RAT specific field may comprise a field with a type which can be applied for a RAT with one group. For another example, one field defined in 6G may only be applied to a group with cells for 6G, and not applied for another group with cells for 4G / 5G.
[0101] In a third alternative example manner for joint scheduling by a single DCI, HARQ-ACK feedback for different RATs may be grouped in one codebook. For example, PUCCH cell or PUCCH cell group may be defined for the RATs independently, and cross PUCCH group HARQ-ACK feedback can be supported. In case multiple cells scheduling is used for scheduling across multiple RATs, cross PUCCH group HARQ-ACK feedback may be supported and the scheduling may further indicate whether or not to feedback in another PUCCH group. For example. pucch group#1 may correspond to cell#1 and cell#2 for 4G / 5G, pucch group#2 may correspond to cell#3 and cell#4 for 6G, and HARQ-ACK feedback for different RATs may be grouped in one codebook and carried on cell#1 which is configured with the PUCCH resource.
[0102] In the various implementation for option 2 above, different frequency resources may be shared among different RATs, providing higher efficient on spectrum utilization. The different spectrum resources used for different RATs for a same UE can be jointly scheduled by single DCI, thereby enhancing flexibility in scheduling or transmission. Further traffic of different RATs can be transmitted simultaneously on different frequency resources for the same UE to enhance effective transmission bandwidth.
[0103] When the various implementations above are described in the context of option 2, they may also be applied in the implementations of option 1.
[0104] The implementations above refers to a first RAT and as second RAT. These inter-RAT implementations, however, apply to situations where more than two RATS are involved in the utilization of a single or multiple spectrum resources.
[0105] Spectrum Resource Sharing or Independent Utilization in Cell Free Systems
[0106] In some example implementations, spectrum resources used in a cell free system may be shared among wireless access network nodes (referred to as access points in cell free context) or may be utilized independently by the wireless access network nodes.
[0107] The term “cell free” refer to lack of well-defined cells from the network’s view. However, in a cell free system, a cell may be defined from the view of UE in that a UE is centralized in its own cell and may be connected to more than one access point (AP) around the UE. A cell free implementation may be a potential scheme to achieve distributed cell deployment. As shown in FIG. 10, UE 1002 (UE1) may be connect to an AP set comprising AP #2 / 4 / 5 and a cell 1004 (cell #1) from the view of the UE may be supported by the three APs. These particular APs together form a distributed antenna array that functions as a massive MIMO arrangement for the UE 1002, where transmission beams targeting the location of the UE 1002 are dynamically managed by a central processing unit (CPU) . Each mobile UE in the cell free network may be associated with a moving cell with the selection of the APs for providing the UE centric cell changes over time. The cells of various UEs may overlap therebetween. In other words, a same AP may be part of multiple UE-centric cells of different UEs. The cell free network above may be alternatively referred as “de-celled” network or “de-cellular” network. With such a UE centric cell, the UE could receive the services from multiple APs, and interference from adjacent APs that may occur in traditional wireless communication systems may be reduced. Such a cell free scheme further provides enhanced flexibility for the UE to select its serving APs with more autonomy.
[0108] The APs in the cell free system may each comprise single or not large number of antennae, while large number of APs may be deployed within a region. In some example implementations, traffic of multiple APs may be forwarding to the CPU, a same frequency resource may be used for different UEs in different locations. Multiple frequencies or carriers may be used in such a cell free system by the various APs in various example manners described below.
[0109] In some example implementations, a carrier set may be determined in an AP set for the UE and different carrier sub-sets from the carrier set may be applied to (or used by) different APs in the AP set. For example, the AP set for the UE can be determined by the network and as an option, the carrier set for the AP set may also be determined by the network (e.g., by the CPU) in combination with UE capability reporting. Alternatively, the AP set for the UE may be determined by the UE, and as an option, the carrier set may also be determined by the UE, e.g., according to the UE capability limited by the maximum number of carriers per AP set, and carrier sub-set for each AP among the AP set may be determined by the UE capability in combination with, e.g., coverage of each AP. For example, as shown in FIG. 11, the AP set may include AP #2 / 4 / 5 for UE1, the carrier set may include carriers f1, f 2 and f3, and carrier aggregation may be performed by aggregating carrier f1 with AP2, carrier f3 with AP4, and carrier f2 with AP5. In some example implementations, the UE centric cell may be a single cell associated with multiple carriers corresponding to multiple APs. For example, in FIG. 12, UE 1 may be associated with traffic type 1 and with AP set {2, 4, 5} , UE 2 (not shown) may be associated with traffic type 2 and with AP set {2, 4} . For another example, the AP set may be determined by traditional reference signal measurement in comparison to, e.g. one or more RSRP (reference signal receive power) thresholds at, for example, an initial access and / or RRC connected state, and the number of APs in the AP set may be selected according to the threshold (s) . In other words, CA (of the carrier set) may be configured by network, while the AP set may be determined by each UE.
[0110] In some other example implementations, the carrier set may be determined based on a reference AP in an AP set, and carrier sub-sets may be applied for different APs in the AP set. For example, the reference AP in the AP set may be an AP among the AP set with a maximum number of antennae, or with the nearest location to the UE associated with the AP set. In some example implementations, the carrier set may be determined by the network, e.g., by the CPU, and in combination with UE capability reporting. In some example implementations, carrier (s) for each AP in the AP set used for the UE may be based on the transmission capability of the each AP. In some example implementations, the AP set for the UE can be determined by the UE, with an option that the carrier set may also be determined by the UE, e.g., according to the UE capability limited by a maximum number of carriers per AP, and carrier sub-set for each AP in the AP set may be determined by the UE capability in combination with, e.g., coverage of each AP. For example, as shown in FIG. 12, the example AP set for UE1 comprises AP2, AP4 and AP5, the example carrier set comprises f1, f2 and f3, and carrier aggregation may be performed by aggregating, for example, f1, f2 and f3 with AP4, f1 with AP2, and f1 and f2 with AP5.
[0111] The example implementation above for spectrum resource usages in the example cell free system for a same UE by different APs may beneficially provide higher efficiency on spectrum utilization. The same or different spectrum resources used for different APs for the same UE may be distributed or localized among the APs for flexible scheduling or transmission.
[0112] Finally, as described in the various schemes above, spectrum resources may be shared between different RATs or APs among an AP set for a UE in a cell-free system. Specifically, sharing of a same spectrum resource by different RATs for a same UE (option 1 above) may be achieved by one of (1) using the same spectrum resource for the same UE in different cells corresponding to different RATs, where the different cells are associated with different cell groups; (2) using the same spectrum resource for the same UE in different cells corresponding to different RATs, wherein the different cells are associated a same cell group; (2) using the same spectrum resource for the same UE in a same cell corresponding to different RATs.
[0113] Further, sharing of the same spectrum resource by different RATs for the same UE (option 1 above) may be achieved by channel or resource sharing. For example, such sharing may include control channel sharing. The shared control channel may be one a control channel of one of the RATs (e.g., 6G RAT) . The shared control channel may be used to send DCI defined in more than one RATs. For example, the capability on blind DCI decoding may be counted in only one of the RATs, or may be counted in different RATs with corresponding scaling factors. For example, restriction on the application of shared control channel may include one of following: (1) the control information in the shared control channel may include a RAT flag indication; (2) the control information in the shared control channel may be zero-padded for different RATs. Alternatively, such channel or resource sharing may include resource sharing. For example, the shared resources used for signals / channels if one RAT may be indicated by control channel of another RAT.
[0114] Further, sharing of different spectrum resources by different RATs for a same UE (option 2 above) may be jointly scheduled by single DCI. For example, a RAT for transmitting the single DCI may be determined by blind detection or may be predefined or determined by configuration. For another example, at least one RAT specific or common field may be in included in the single DCI. For yet another example, HARQ-ACK feedback for different RATs may be grouped in one codebook.
[0115] For spectrum resource utilization in a cell free system, multiple carriers used for cell free implementations may be determined as a carrier set for an AP set associated with a UE. Different carrier sub-sets among the carrier set may be applied to different APs in the AP set. Alternatively, multiple carriers used for cell free implementations may be determined as a carrier set based on a reference AP in the AP set for the UE, and carrier sub-sets among the carrier set may be applied to different APs in the AP set.
[0116] 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.
[0117] 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” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment / implementation” 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.
[0118] 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.
[0119] 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.
[0120] 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 a wireless terminal device, comprising:establishing connection with at least one wireless access network nodes via both a first radio access technology (RAT) and a second RAT over at least one radio spectrum resource, the second RAT being distinct with the first RAT and each of the at least one radio spectrum resource comprises a pre-configured radio spectral range; andusing the at least one radio spectrum resource for the first RAT and the second RAT.2.The method of claim 1, wherein the at least one radio spectrum resource comprises one pre-configured radio spectral range shared by the first RAT and the second RAT.3.The method of claim 2, wherein using the one pre-configured radio spectral range for the first RAT and the second RAT comprises using the one pre-configured radio spectral range for communication with a first cell and a second cell based on the first RAT and the second RAT, respectively, the first cell and the second cell belonging to different cell groups or being distinct and belonging to a same cell group.4.The method of claim 2, wherein using the one pre-configured radio spectral range for the first RAT and the second RAT comprises using the one pre-configured radio spectral range for communicating with a single cell supporting both the first RAT and the second RAT.5.The method of claim 2, wherein using the one pre-configured radio spectral range for the first RAT and the second RAT comprises channel sharing between the first RAT and the second RAT.6.The method of claim 5, wherein using the one pre-configured radio spectral range for the first RAT and the second RAT comprises sharing at least one control channel between the first RAT and the second RAT.7.The method of claim 6, wherein:the first RAT comprises a 6G RAT, and the second RAT comprises a 4G or 5G RAT; andthe at least one control channel shared between the first RAT and the second RAT comprises a 6G control channel.8.The method of claim 6, wherein the at least one control channel shared between the first RAT and the second RAT is configured for receiving a downlink control information (DCI) defined in both the first RAT and the second RAT.9.The method of claim 8, wherein a capability of blind detection of the DCI by the wireless terminal device is counted towards one of the first RAT and the second RAT or both of the first RAT and the second RAT with a scaling factor.10.The method of claim 6, wherein control information carried in the at least one control channel shared by the first RAT and the second RAT comprises a RAT flag for indicating which of the first RAT and the second RAT is the control information for.11.The method of claim 6, wherein control messages carried in the at least one control channel shared by the first RAT and the second RAT are constructed with a size to accommodate formats of both a first predefined control information size of the first RAT and a second predefined control information size of the second RAT, and are padded with zero bits when carrying the control messages comprising a shorter of the first predefined control information size and the second predefined control information size.12.The method of claim 2, wherein using the one pre-configured radio spectral range for the first RAT and the second RAT comprises resource sharing between the first RAT and the second RAT.13.The method of claim 12, wherein resources of the first RAT shared with the second RAT is indicated by a control channel of the first RAT.14.The method of claim 13, wherein the first RAT is a 6G RAT and the second RAT is a 4G or 5G RAT.15.The method of claim 1, wherein the at least one radio spectrum resource comprises a first pre-configured radio spectral range and a second pre-configured spectral range used by the first RAT and the second RAT.16.The method of claim 15, wherein downlink spectral resources of the first pre-configured radio spectral range and / or the second pre-configured spectral range are dynamically scheduled by single DCI.17.The method of claim 16, wherein a RAT of the single DCI is determined by the wireless terminal device via blind detection or is pre-configured.18.The method of claim 16, wherein at least one RAT specific field or RAT common field of the first RAT and the second RAT is included in the single DCI.19.The method of claim 16, wherein hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback associated with the first RAT and the second RAT are grouped in one codebook.20.A method performed by a wireless access network node, comprising:establishing connection with a wireless terminal device via both a first radio access technology (RAT) and a second RAT over at least one radio spectrum resource, the second RAT being distinct with the first RAT and each of the at least one radio spectrum resource comprises a pre-configured radio spectral range; andusing the at least one radio spectrum resource for the first RAT and the second RAT for communication with the wireless terminal device.21.The wireless terminal device any one of claims 1 to 19, the wireless terminal device comprising a processor and a memory, wherein the processor is configured to read computer code from the memory to cause the wireless terminal device to perform the method of any one of claims 1 to 19.22.A computer program product comprising a non-transitory computer-readable program medium with computer code stored thereupon, the computer code, when executed by a processor of the wireless terminal device of any one of claims 1 to 19, causing the processor to implement the method of any one of claims 1 to 19.23.The wireless access network node of claim 20, the wireless access network node comprising a processor and a memory, wherein the processor is configured to read computer code from the memory to cause the wireless access network node to perform the method of claim 20.24.A computer program product comprising a non-transitory computer-readable program medium with computer code stored thereupon, the computer code, when executed by a processor of the wireless access network node of claim 20, causing the processor to implement the method of claim 20.
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