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WO2025111809A1 - Procédé de partage de spectre inter-rat - Google Patents

Procédé de partage de spectre inter-rat Download PDF

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Publication number
WO2025111809A1
WO2025111809A1 PCT/CN2023/134772 CN2023134772W WO2025111809A1 WO 2025111809 A1 WO2025111809 A1 WO 2025111809A1 CN 2023134772 W CN2023134772 W CN 2023134772W WO 2025111809 A1 WO2025111809 A1 WO 2025111809A1
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WO
WIPO (PCT)
Prior art keywords
rat
cell
radio
spectral range
shared
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2023/134772
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English (en)
Inventor
Jing Shi
Xianghui HAN
Min Ren
Xing Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
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Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to PCT/CN2023/134772 priority Critical patent/WO2025111809A1/fr
Publication of WO2025111809A1 publication Critical patent/WO2025111809A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • This disclosure is directed generally to wireless communication networks and particularly to inter-RAT (radio access technology) spectrum utilization.
  • inter-RAT radio access technology
  • RATs radio access technologies
  • 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.
  • This disclosure is directed generally to wireless communication networks and particularly to inter-RAT (radio access technology) spectrum utilization.
  • inter-RAT radio access technology
  • a method performed by a wireless terminal device 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.
  • RAT radio access technology
  • the at least one radio spectrum resource comprises one pre-configured radio spectral range shared by the first RAT and the second RAT.
  • 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.
  • 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.
  • 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.
  • 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.
  • the first RAT comprises a 6G RAT
  • the second RAT comprises a 4G or 5G RAT
  • the at least one control channel shared between the first RAT and the second RAT comprises a 6G control channel.
  • 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.
  • DCI downlink control information
  • 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.
  • 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.
  • 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.
  • 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.
  • resources of the first RAT shared with the second RAT is indicated by a control channel of the first RAT.
  • the first RAT is a 6G RAT and the second RAT is a 4G or 5G RAT.
  • 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.
  • 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.
  • a RAT of the single DCI is determined by the wireless terminal device via blind detection or is pre-configured.
  • At least one RAT specific field or RAT common field of the first RAT and the second RAT is included in the single DCI.
  • hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback associated with the first RAT and the second RAT are grouped in one codebook.
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • a method performed by a wireless access network node 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.
  • RAT radio access technology
  • 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.
  • 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.
  • FIG. 1 illustrates an example wireless communication network including a wireless access network, a core network, and data networks.
  • 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.
  • UEs User Equipments
  • FIG. 3 shows an example radio access network (RAN) architecture.
  • RAN radio access network
  • FIG. 4 shows an example communication protocol stack in a wireless access network node or wireless terminal device including various network layers.
  • FIG. 5 shows an example core network
  • FIG. 6 shows an example implementation for inter-RAT spectrum utilization.
  • FIG. 7 shows another example implementation for inter-RAT spectrum utilization.
  • FIG. 8 shows yet another example implementation for inter-RAT spectrum utilization.
  • FIG. 9 illustrates an example scheme for control channel sharing between different RATs.
  • FIG. 10 illustrates an example cell free system.
  • FIG. 11 illustrates an example spectrum utilization scheme in the cell free system of FIG. 10.
  • 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.
  • inter-RAT spectrum utilization may include but are not limited to LTE, NR, 6G, and any current and other future mobile communication technologies.
  • 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) .
  • DC dual connection
  • CA carrier aggregation
  • An example wireless communication network 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 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.
  • WANNs wireless access network nodes
  • 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.
  • the other data networks 150 may also be connected to the core network 130.
  • the UEs may communicate with one another via the wireless access network.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Data packets in a wireless access network 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.
  • RRC radio link control
  • 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.
  • 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.
  • 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.
  • the WANNs may of FIG. 3 may be configured to communicate with one another via inter-node interfaces.
  • the gNBs may communicate with one another via an Xn interface.
  • 5G base stations gNBs may communicate with LTE base stations such as NodeBs or eNodeBs via an X2 interface.
  • the WANN 320 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.
  • the CU may be a gNB Central Unit (gNB-CU)
  • 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.
  • 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.
  • the Xn or X2 interfaces may include an Xn-C and Xn-U or X2-C and X2-U interfaces.
  • each CU and DU are considered separate access network node.
  • the F1 interface thus falls within a definition of inter-node communication interface.
  • 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.
  • 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.
  • UE1, UE2, and UE3 may be served by cell1 330 of the DU1
  • UE4 and UE5 may be served by cell2 332 of the DU1
  • UE6 and UE7 may be served by cell3 associated with DU2.
  • 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.
  • 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) .
  • MCG Master CG
  • SCG Secondary CG
  • a primary cell in a MSG for example, may be referred to as a PCell
  • PScell Primary cell in a SCG
  • 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) .
  • serving 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.
  • 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.
  • PDCP layer Packet Data Convergence Protocol layer
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • SDAP service data adaptation protocol
  • 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.
  • AMF access management network function
  • SMF session management function
  • UPF user plane function
  • PCF policy control function
  • AF application data management function
  • 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.
  • 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.
  • 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 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.
  • LTE Long-Term Evolution
  • NR 5th Generation mobile communication technology
  • DSS dynamic spectrum sharing
  • 4G Long-Term Evolution
  • part of the LTE spectral resources may be carved out for NR communications.
  • 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.
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • CRS Cell-specific Reference Signal
  • wireless spectrum may be utilized in units of carriers or sub-carriers for communications between wireless terminal devices and access network nodes.
  • inter-carrier resource scheduling may be implemented for reducing scheduling overhead, thereby improving resource utilization efficiency.
  • a PCell and an SCell in NR may utilized different wireless carriers.
  • 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.
  • 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) .
  • DC dual connection
  • CA carrier aggregation
  • 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.
  • a spectrum resource may include one or more predetermined, pre-configured, or allocated wireless carriers or sub carriers.
  • 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.
  • FR1 frequency range 1
  • FR2 frequency range 2
  • 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) .
  • granularity levels e.g., resource blocks, channel, sub-carrier, carrier or other levels in frequency, or frame, subframe, slot, and symbol in time
  • 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.
  • RRC radio resource control
  • DSS dynamic spectrum sharing
  • 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.
  • a same frequency resource at f1 e.g., a carrier on a band
  • a second cell 604 of a second RAT e.g., 4G/5G RAT
  • 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.
  • 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 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.
  • 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.
  • 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) .
  • a first RAT e.g., 6G RAT
  • UE1 first UE 706
  • a second cell 704 of a second RAT e.g., 4G/5G RAT
  • 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) .
  • wireless access network node 710 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) .
  • 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) .
  • a first RAT e.g., 6G RAT
  • 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.
  • 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.
  • s wireless access network node
  • 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.
  • the utilization of f1 and f2 may be configured to provide communications to the same UE 806 via an inter-RAT Carrier Aggregation (CA) .
  • CA Carrier Aggregation
  • 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.
  • 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)
  • 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.
  • DSS may be achieved via DC.
  • 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.
  • 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.
  • 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)
  • 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) .
  • 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.
  • the same spectrum resource may be used for a same cell corresponding to and supporting multiple different RATs for a same UE.
  • 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) .
  • 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.
  • 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.
  • 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.
  • 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.
  • the first RAT e.g., 6G RAT
  • the second RAT e.g., 4G/5G RAT
  • 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.
  • Example manners in which the same spectrum resource may be shared by different RATs for the same UE are further described below.
  • 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.
  • 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.
  • 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.
  • the horizontal direction and the vertical direction are associated with time and frequency, respectively.
  • the shared control channel above may be a control channel associated with one of the first RAT and the second 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) .
  • the capability on blind decoding of the shared control channel may be counted in only one of the RATs, e.g., 6G RAT.
  • the capability on blind decoding of the shared control channel may be counted in different RATs with corresponding scaling factors.
  • the shared control channel may be one or more NR PDCCHs, which may be used to transmit DCIs defined according to the multiple RATs.
  • NR PDCCHs may be located in partial control resource sets and search spaces.
  • the shared control channel may be one or more LTE PDCCHs, which may be used to transmit DCIs defined according to the multiple RATs.
  • LTE PDCCHs may be used to transmit DCIs defined according to the multiple RATs.
  • partial or all LTE PDCCHs used for control channel sharing may be located in partial search spaces.
  • the network may be updated to support using legacy RAT channel to transmit control information associated with later different RATs.
  • 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:
  • 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.
  • RAT flag for example, may indicate which RAT does the particular control information apply to.
  • 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.
  • ⁇ 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.
  • the underlying control channel e.g., 6G control channel
  • 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.
  • 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.
  • 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) .
  • 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.
  • such partial resources for sharing may be determined based on network configuration, or based on indication of signal/channel of the first RAT.
  • 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) .
  • 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.
  • 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.
  • traffic channel sharing between the various RATs may be employed.
  • dynamic scheduling may be implemented to indicate that traffic of one of the multiple RATs may be transmit 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.
  • the priority of the second RAT e.g., legacy 4G/5G RAT
  • the first RAT e.g., current/new 6G RAT
  • the reference signal of different RATs can be detected or distinguished by network or UE.
  • the different RATS may be associated with the same hybrid automatic repeat request (HARQ) entities or different HARQ entities.
  • HARQ hybrid automatic repeat request
  • the same spectrum resource used for the different RATs may be associated with different cells.
  • each HARQ entity may be associated with a cell, and different HARQ entities may be associated with different RATs.
  • a same HARQ entity may be used for different RATs and different HARQ entities for different RATs may not be supported.
  • a HARQ process number pool may be shared or divided for different RATs.
  • different HARQ entities for different RATs may be supported.
  • the same spectrum resource used for different RATs may be associated with a same cell.
  • a HARQ entity may be associated with the cell, and the HARQ entity may be further associated with different RATs.
  • different HARQ entities may be used for different RATs for the same cell.
  • the inter-RAT sharing of the spectrum resource may involve uplink sharing.
  • uplink sharing Several example alternative implementations are provided below for uplink sharing.
  • 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.
  • physical uplink control channel 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) .
  • the PUCCH of the first RAT e.g., 6G RAT
  • the second RAT e.g., 4G/5G RAT
  • HARQ-ACK HARQ -Acknowledgement
  • the UL signal/channel may be associated with different RATs.
  • different UL signals/channels may be used for different RATs.
  • UL signals/channels of the first RAT e.g., 6G RAT
  • the second RAT e.g., 4G/5G RAT
  • 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.
  • inter-RAT spectrum resource sharing under option 1 may not be limited to option 1.
  • these various example implementations may be applicable to option 2 for inter-RAT spectrum resource sharing above and described further below.
  • Example manners in which the same spectrum resource is shared between different RATs for different UEs may include detailed implementation with respect to scheduling of the different spectrum resources used for different RATs for the UEs.
  • the different spectrum resources used for different RATs for a same UE may be scheduled by each RAT independently.
  • 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.
  • 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.
  • the known RAT e.g., 6G RAT as a new RAT as opposed to a legacy RAT, e.g., 4G/5G RAT
  • At least one RAT-specific or common field may be included in the single DCI.
  • 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.
  • the at least one RAT common field may include a DL or UL flag indication.
  • 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.
  • the RAT specific field may comprise a field with a type which can be applied for a RAT with one group.
  • 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.
  • HARQ-ACK feedback for different RATs may be grouped in one codebook.
  • PUCCH cell or PUCCH cell group may be defined for the RATs independently, and cross PUCCH group HARQ-ACK feedback can be supported.
  • 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
  • HARQ-ACK feedback for different RATs may be grouped in one codebook and carried on cell#1 which is configured with the PUCCH resource.
  • 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.
  • 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.
  • 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.
  • cell free refer to lack of well-defined cells from the network’s view.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the UE centric cell may be a single cell associated with multiple carriers corresponding to multiple APs.
  • 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 ⁇
  • 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) .
  • RSRP reference signal receive power
  • CA of the carrier set
  • the AP set may be determined by each UE.
  • 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.
  • 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.
  • the carrier set may be determined by the network, e.g., by the CPU, and in combination with UE capability reporting.
  • carrier (s) for each AP in the AP set used for the UE may be based on the transmission capability of the each AP.
  • 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.
  • the example AP set for UE1 comprises AP2, AP4 and AP5
  • the example carrier set comprises f1, f2 and f3
  • carrier aggregation may be performed by aggregating, for example, f1, f2 and f3 with AP4, f1 with AP2, and f1 and f2 with AP5.
  • 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.
  • spectrum resources may be shared between different RATs or APs among an AP set for a UE in a cell-free system.
  • sharing of a same spectrum resource by different RATs for a same UE 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.
  • sharing of the same spectrum resource by different RATs for the same UE may be achieved by channel or resource sharing.
  • 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.
  • 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.
  • 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.
  • such channel or resource sharing may include resource sharing.
  • the shared resources used for signals/channels if one RAT may be indicated by control channel of another RAT.
  • sharing of different spectrum resources by different RATs for a same UE may be jointly scheduled by single DCI.
  • a RAT for transmitting the single DCI may be determined by blind detection or may be predefined or determined by configuration.
  • at least one RAT specific or common field may be in included in the single DCI.
  • HARQ-ACK feedback for different RATs may be grouped in one codebook.
  • 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.
  • 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.
  • 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.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente divulgation concerne des schémas unifiés ainsi que des schémas spécifiques pour une utilisation de spectre inter-RAT. Simplement à titre d'exemple, les diverses RAT peuvent comprendre, entre autres, LTE, NR, 6G et n'importe quelle autre technologie de communication mobile actuelle ou future. Ce partage de spectre inter-RAT peut être obtenu par allocation dynamique de ressources entre RAT, entre fréquences (par exemple, des porteuses) et/ou entre cellules pour un dispositif terminal sans fil ou un UE donné, sous la forme de double connexion (DC) et/ou d'agrégation de porteuses (CA).
PCT/CN2023/134772 2023-11-28 2023-11-28 Procédé de partage de spectre inter-rat Pending WO2025111809A1 (fr)

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Citations (3)

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US20210266753A1 (en) * 2020-02-21 2021-08-26 Qualcomm Incorporated Enhancements for multiple radio protocol dynamic spectrum sharing
US20230262471A1 (en) * 2022-02-17 2023-08-17 Qualcomm Incorporated Techniques for dynamic spectrum sharing between radio access technologies
CN116830632A (zh) * 2021-02-11 2023-09-29 高通股份有限公司 与动态频谱共享载波相关的信令

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US20210266753A1 (en) * 2020-02-21 2021-08-26 Qualcomm Incorporated Enhancements for multiple radio protocol dynamic spectrum sharing
CN116830632A (zh) * 2021-02-11 2023-09-29 高通股份有限公司 与动态频谱共享载波相关的信令
US20230262471A1 (en) * 2022-02-17 2023-08-17 Qualcomm Incorporated Techniques for dynamic spectrum sharing between radio access technologies

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