Fast switch on initial access from legacy radio access to new radio access in mobile communications
The method enables efficient switching from 5G to 6G by synchronizing the UE's downlink receiver with initial access parameters, addressing challenges of increased searching and energy consumption in dual system broadcasting.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- MEDIATEK SINGAPORE PTE LTD
- Filing Date
- 2025-11-05
- Publication Date
- 2026-05-15
AI Technical Summary
In mobile communications, transitioning from legacy 5G to new 6G radio access in idle mode poses challenges such as increased searching, limited uplink transmission coverage, and increased network energy consumption due to dual system broadcasting, especially when not all base stations support 6G.
A method involving a UE receiving initial access parameters via a legacy radio access to synchronize with a new radio access before switching, allowing seamless transition to the new radio access for both downlink and uplink communications.
Facilitates low-latency and efficient switching from 5G to 6G by synchronizing the UE's downlink receiver to the new radio access, optimizing network energy use and reducing search frequency.
Smart Images

Figure CN2025132698_15052026_PF_FP_ABST
Abstract
Description
FAST SWITCH ON INITIAL ACCESS FROM LEGACY RADIO ACCESS TO NEW RADIO ACCESS IN MOBILE COMMUNICATIONSCROSS REFERENCE TO RELATED PATENT APPLICATION (S)
[0001] The present disclosure claims the priority benefit of U.S. Patent Application No. 63 / 716,269, filed 05 November 2024, the content of which herein being incorporated by reference in its entirety.TECHNICAL FIELD
[0002] The present disclosure is generally related to mobile communications and, more particularly, to fast switch on initial access from legacy radio access to new radio access in mobile communications.BACKGROUND
[0003] In wireless communications such as mobile communications under the current 3rd Generation Partnership Project (3GPP) specification, both 5th Generation (5G) and 6th Generation (6G) technologies would exist in networks, with 6G being likely to be deployed in higher bands compared with 5G. When in an idle or inactive mode, if a user equipment (UE) camps on a 6G cell in a higher frequency band, certain drawbacks may occur. Firstly, more searching may be likely for operation in a higher frequency band versus operation on a lower 5G frequency band and / or carrier. Secondly, uplink (UL) transmission coverage in the higher band may be limited and thus the UE may have UL transmissions redirected to lower 5G frequency / carrier band. The above drawbacks can be overcome if 6G is deployed in a lower band (e.g., using multi-radio access technology (multi-RAT) spectrum sharing (MRSS) ) ; however, other drawbacks are foreseen with this approach. For example, 6G paging and / or system information blocks (SIBs) in 5G carrier frequency / band (which takes some capacity away from the 5G operation) may be required. Additionally, the device (e.g., UE) may have to search for 5G and 6G frequently on the same carrier frequency if not all base station (BS) sites have been upgraded to support 6G in addition to 5G. Moreover, some increase in networking energy consumption may be likely when there is low load for 5G and 6G, due to broadcast signals of both systems being transmitted. Furthermore, the UE may need to support 6G in the carrier frequency / band in which 5G is used.
[0004] As such, trade-offs need to be considered regarding how a device (which supports both 5G and 6G) should operate in the idle mode in terms of 5G or 6G operation, and how it should best access the network to fulfill service and user experience needs. It would be beneficial to find a way that allows the UE to camp on a legacy RAT (e.g., 5G) when in the idle mode and quickly transition to a new RAT (e.g., 6G) when connecting to the network. Therefore, there is a need for a solution of fast switch on initial access from legacy radio access to new radio access in mobile communications.SUMMARY
[0005] The following summary is illustrative only and is not intended to be limiting in any way. That is, the following summary is provided to introduce concepts, highlights, benefits, and advantages of the novel and non-obvious techniques described herein. Select implementations are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
[0006] An objective of the present disclosure is to propose solutions or schemes that address the issue (s) described herein. More specifically, various schemes proposed in the present disclosure are believed to provide solutions pertaining to fast switch on initial access from legacy radio access to new radio access in mobile communications. It is believed that implementations of one or more of the schemes proposed herein may address or otherwise alleviate the issues described above.
[0007] In one aspect, a method may involve a UE camping on a network via a first radio access of a first technology while in an idle or inactive mode. The method may also involve the UE receiving, from the network, a broadcast signal of the first technology including one or more parameters related to initial access to a second radio access of a second technology. The one or more parameters may enable the UE to synchronize its downlink (DL) receiver to a carrier frequency or band of the second technology before switching to operate on the second radio access. The method may further involve the UE switching to operate on or communicate with the network via the second radio access to receive DL signals of the second technology on the carrier frequency or band of the second technology. The method may further involve the UE (and the network) carrying out subsequent communications via the second technology in the uplink and / or downlink directions.
[0008] In another aspect, a method may involve a network node of a network transmitting, to a UE while the UE is camped on the network in an idle or inactive mode via a first radio access of a first technology, a broadcast signal of the first technology including one or more parameters related to initial access to a second radio access of a second technology. The one or more parameters may enable the UE to synchronize and operate on DL to a carrier frequency or band of the second technology before switching to camping on the second radio access. The method may also involve the network node receiving, from the UE, one or more messages after the UE switches to operate on the network via the second radio access of the second technology. The method may further involve the network (and the UE) carrying out subsequent communications via the second technology in the uplink and / or downlink directions.
[0009] It is noteworthy that, although the description provided herein may be in the context of certain radio access technologies, networks, and network topologies such as 5G / New Radio (NR) / Beyond Fifth-Generation (B5G) / 6G mobile communications, the proposed concepts, schemes and any variation (s) / derivative (s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies such as, for example and without limitation, 4th Generation (4G) / Long-Term Evolution (LTE) , LTE-Advanced, LTE-Advanced Pro, Internet-of-Things (IoT) , Narrow Band Internet of Things (NB-IoT) , Industrial Internet of Things (IIoT) , vehicle-to-everything (V2X) , and non-terrestrial network (NTN) communications. Thus, the scope of the present disclosure is not limited to the examples described herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the present disclosure. The drawings illustrate implementations of the disclosure and, together with the description, serve to explain the principles of the disclosure. It is appreciable that the drawings are not necessarily in scale as some components may be shown to be out of proportion than the size in actual implementation in order to clearly illustrate the concept of the present disclosure.
[0011] FIG. 1 is a diagram of an example network environment in which various solutions and schemes in accordance with the present disclosure may be implemented.
[0012] FIG. 2 is a diagram of an example scenario under a proposed scheme in accordance with the present disclosure.
[0013] FIG. 3 is a diagram of an example scenario under a proposed scheme in accordance with the present disclosure.
[0014] FIG. 4 is a diagram of an example scenario under a proposed scheme in accordance with the present disclosure.
[0015] FIG. 5 is a diagram of an example scenario under a proposed scheme in accordance with the present disclosure.
[0016] FIG. 6 is a block diagram of an example communication system under a proposed scheme in accordance with the present disclosure.
[0017] FIG. 7 is a flowchart of a second example process under a proposed scheme in accordance with the present disclosure.
[0018] FIG. 8 is a flowchart of a second example process under a proposed scheme in accordance with the present disclosure. DETAILED DESCRIPTION OF PREFERRED IMPLEMENTATIONS
[0019] Detailed embodiments and implementations of the claimed subject matters are disclosed herein. However, it shall be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matters which may be embodied in various forms. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that description of the present disclosure is thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In the description below, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations. Overview
[0020] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to fast switch on initial access from legacy radio access to new radio access in mobile communications. According to the present disclosure, a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
[0021] FIG. 1 illustrates an example network environment 100 in which various solutions and schemes in accordance with the present disclosure may be implemented. FIG. 2 ~ FIG. 8 illustrate examples of implementation of various proposed schemes in network environment 100 in accordance with the present disclosure. The following description of various proposed schemes is provided with reference to FIG. 1 ~FIG. 8.
[0022] Referring to FIG. 1, network environment 100 involves a UE 110 in wireless communication with a wireless network 120 (e.g., a mobile network including a non-terrestrial network (NTN) and a terrestrial network (TN) ) via a terrestrial network node 125 (e.g., an evolved Node-B (eNB) , a Next Generation Node-B (gNB) , or a transmission / reception point (TRP) ) and / or a non-terrestrial network node 128 (e.g., a satellite) . For example, the terrestrial network node 125 and / or the non-terrestrial network node 128 may form an NTN serving cell for wireless communication with the UE 110. In some implementations, the UE 110 may be an IoT device such as an NB-IoT UE or an enhanced machine-type communication (eMTC) UE (e.g., a bandwidth reduced low complexity (BL) UE or a coverage enhancement (CE) UE) . In such communication environment, the UE 110, the network 120, the terrestrial network node 125, and the non-terrestrial network node 128 may implement various schemes pertaining to handling system mode capability due to a UE-initiated deregistration or detach procedure in mobile communications in accordance with the present disclosure, as described below.
[0023] It is noteworthy that, while the various proposed schemes may be individually or separately described below, in actual implementations some or all of the proposed schemes may be utilized or otherwise implemented jointly. Of course, each of the proposed schemes may be utilized or otherwise implemented individually or separately. Moreover, as used herein, a lower layer may refer to a layer in the 5G Mobility Management (5GMM) or 6G Mobility Management (6GMM) protocol stack that is lower than the radio resource control (RRC) layer, such as a packet data convergence protocol (PDCP) layer, a radio control link (RLC) layer, a medium access control (MAC) layer, a physical (PHY) layer, or so forth.
[0024] With respect to a UE (e.g., UE 110) capable of supporting both legacy radio access (e.g., 5G) and new radio access (e.g., 6G) in an idle mode (or another inactive state) transitioning to a connected state, two approaches may be considered but not ideal. In a first approach (or Alternative 1) , the UE may camp in idle mode as a 6G UE in a carrier frequency / band on which a network is operating 5G (e.g., wireless network 120) . One benefit of this first approach is that the UE can access 6G performance directly with no delay on the same carrier frequency / band. However, there are several drawbacks associated with this first approach. Firstly, it requires 6G paging / SIBs in 5G carrier frequency / band (which takes some capacity away from the 5G operation) . Secondly, the UE may have to search for 5G and 6G frequently on the same carrier frequency if not all BS sites have been upgraded to support 6G in addition to 5G. Thirdly, some increase in network energy consumption may be likely when there is low load for 5G and 6G due to broadcast signals of both systems being transmitted. Lastly, but not least, the UE needs to support 6G in the carrier frequency / band in which 5G is used.
[0025] In a second approach (or Alternative 2) , the UE may camp as a 6G UE in idle mode on a higher carrier frequency / band (e.g., 6 ~ 24GHz) . One benefit of this second approach is that the UE is already synchronized on the high band and thus there should be no delay in receiving DL messages or signals. On the other hand, there are also several drawbacks associated with this second approach. Firstly, more searching may be likely just for idle mode camping on a higher frequency band / carrier versus idle camping on a lower 5G frequency band / carrier. Secondly, UL transmissions in the higher frequency band may be limited in coverage and thus the UE may have UL transmissions redirected to lower 5G frequency / carrier band.
[0026] Under various proposed schemes in accordance with the present disclosure, a UE (e.g., UE 110) may camp similarly as a “5G idle or inactive UE” on 5G carrier frequency / carrier band with 5G SIBs / paging received. The UE may receive at least some 6G initial access parameters (e.g., system information (SI) such as system information block type 1 (SIB1) ) via 5G broadcast for 6G, which may be operating on the same or a different carrier frequency / band. These parameters may enable the UE to synchronize on DL to a 6G carrier frequency / band during an initial access, in time for the UE to receive subsequent DL 6G signals on that carrier frequency / band.
[0027] Under the proposed schemes, UL transmissions by the UE may remain on the same (e.g., 5G) carrier frequency / band after initial access. Alternatively, the UE may transmit on 6G-only frequency / band. If UL transmissions (e.g., a sounding reference signal (SRS) or any other UL transmission) move to the 6G-only carrier frequency / band, the timing advance (TA) may be reused after initial access, and UE may not need to perform another PRACH procedure on the 6G-only carrier frequency / band. The decision to synchronize to 6G-only frequency band in DL may be based on triggers such as via a “Mobile Originated traffic volume” measurement threshold. Alternatively, or additionally, the decision to synchronize to 6G-only frequency band in DL may be based on a “received signal level (e.g., reference signal received power (RSRP) ) ” threshold of a 5G carrier frequency / band. In both of the above cases, such information and thresholds may be provided by the network to the UE via information in SIBs and / or via explicit signaling to the UE if the UE is placed in an inactive state or if the UE enters IDLE mode.
[0028] FIG. 2 illustrates an example scenario 200 under a proposed scheme in accordance with the present disclosure (or Alternative 3-1) . In scenario 200, a random access channel (RACH) procedure may be undertaken (e.g., on paging or on mobile originated traffic arrival) . Referring to FIG. 2, a UE (e.g., UE 110) may access a network (e.g., wireless network 120) via 6G transmission directly at message 1 / message A of a random access procedure. The UE may be provided with full 6G initial access information on a 5G broadcast by the network (e.g., using periodic SI that includes, for example, synchronization signal block (SSB) / tracking reference signal (TRS) information / RACH configuration / UL configuration / DL configuration for a 6G carrier) . At some point after message 1 (denoted as “msg1” in FIG. 2) / message A (denoted as “msgA” in FIG. 2) , the UE may switch its reception from a 5G carrier frequency / band to a 6G-only DL carrier frequency / band (including reception of message 2 (denoted as “msg2” in FIG. 2) / message B (denoted as “msgB” in FIG. 2) ) . In terms of performance, while low latency may be achieved, the UE may only have until message 2 / message B to synchronize on the 6G-only DL carrier.
[0029] FIG. 3 illustrates an example scenario 300 under a proposed scheme in accordance with the present disclosure (or Alternative 3-2-1) . In scenario 300, a RACH procedure may be undertaken (e.g., on paging or on mobile originated traffic arrival) . Referring to FIG. 3, a UE (e.g., UE 110) may be provided with full 6G initial access information on a 5G broadcast by the network (e.g., using periodic SI that includes, for example, SSB / TRS information / RACH configuration / DL configuration for a 6G carrier) . In contrast with the embodiment in FIG. 2, the UE may access a network (e.g., wireless network 120) via 5G transmission of message 1 (denoted as “msg1” in FIG. 3) / message A (denoted as “msgA” in FIG. 3) on a 5G carrier frequency / band, and may switch its reception from the 5G carrier frequency / band to a 6G-only DL carrier frequency / band for the reception of message 2 (denoted as “msg2” in FIG. 3) / message B (denoted as “msgB” in FIG. 3) onwards transmitted using 6G on a 6G carrier. In terms of performance, it may take a small amount of time for the UE to synchronize in DL on the 6G-only carrier (before message 2 / message B is received) , which may be the same as in Alternative 3-1 but with more optimal physical random access channel (PRACH) resource (s) .
[0030] FIG. 4 illustrates an example scenario 400 under a proposed scheme in accordance with the present disclosure (or Alternative 3-2-2) . In scenario 400, a RACH procedure may be undertaken. Referring to FIG. 4, a UE (e.g., UE 110) may be provided with full 6G initial access information on a 5G broadcast by the network (e.g., periodic SI such as, for example, SSB / TRS information / RACH configuration / DL configuration for a 6G carrier) . The UE may access a network (e.g., wireless network 120) via 5G transmission of message 1 (denoted as “msg1” in FIG. 4) / message A (denoted as “msgA” in FIG. 4) on a 5G carrier, followed by message 2 (denoted as “msg2” in FIG. 4) / message B (denoted as “msgB” in FIG. 4) transmitted using 6G on a 5G carrier. The UE may switch its reception from the 5G carrier frequency / band to a 6G-only DL carrier frequency / band for subsequent operation. The UE may transmit a 6G channel state information (CSI) report for 6G-only band in 6G messages such as message 3 (denoted as “msg3” in FIG. 4) (e.g., to acquire signal-to-interference-and-noise ratio (SINR) on a 6G-only carrier) . Moreover, under this proposed scheme, 6G SSB / TRS may be required in the 5G carrier.
[0031] FIG. 5 illustrates an example scenario 500 under a proposed scheme in accordance with the present disclosure (or Alternative 3-3) . In scenario 500, a RACH procedure may be undertaken. Referring to FIG. 5, a UE (e.g., UE 110) may be provided with full 6G initial access information on a 5G broadcast by the network (e.g., using periodic SI including, for example, SSB / TRS information / DL configuration for a 6G carrier) . The UE may access a network (e.g., wireless network 120) via 5G transmission of messages 1 ~ 4 (denoted as “msg1” , “msg2” , “msg3” , “msg4” in FIG. 5) / messages A ~ B (denoted as “msgA” and “msgB” in FIG. 5) , with message 4 / message B redirecting the UE to 6G. The network may include a DL / UL configuration for a 6G carrier in message 4 / message B. The UE may switch its reception from the 5G carrier frequency / band to a 6G-only DL carrier frequency / band for subsequent operation. The UE may transmit a 6G CSI report for a 6G-only band in a 6G message 5 (denoted as “msg5” in FIG. 5) . As timing advance (TA) is reused, there is no need for the UE to perform another PRACH procedure on the 6G-only carrier if UL moves there (e.g., for the transmission of a sounding reference signal (SRS) or any other UL transmission) .
[0032] It is noteworthy that, although examples in the present disclosure may be presented in the context of 5G being a legacy radio access and 6G being a new radio access, in actual implementations of one or more of the proposed schemes in accordance with the present disclosure the “legacy radio access” and “new radio access” may vary. For instance, in some implementations, 4G may be the legacy radio access while 5G or 6G may be the new radio access. Similarly, in other implementations, 6G may be the legacy radio access while a beyond-6G technology may be the new radio access, and so on. Thus, the scope of the present disclosure is not to be limited to merely the examples presented in the present disclosure. Illustrative Implementations
[0033] FIG. 6 illustrates an example communication system 600 having at least an example apparatus 610 and an example apparatus 620 in accordance with an implementation of the present disclosure. Each of apparatus 610 and apparatus 620 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to fast switch on initial access from legacy radio access to new radio access in mobile communications, including the various schemes described above with respect to various proposed designs, concepts, schemes, systems and methods described above, including network environment 100, as well as processes described below.
[0034] Each of apparatus 610 and apparatus 620 may be a part of an electronic apparatus, which may be a network apparatus or a UE (e.g., UE 110) , such as a portable or mobile apparatus, a wearable apparatus, a vehicular device or a vehicle, a wireless communication apparatus or a computing apparatus. For instance, each of apparatus 610 and apparatus 620 may be implemented in a smartphone, a smart watch, a personal digital assistant, an electronic control unit (ECU) in a vehicle, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer. Each of apparatus 610 and apparatus 620 may also be a part of a machine type apparatus, which may be an IoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a roadside unit (RSU) , a wire communication apparatus or a computing apparatus. For instance, each of apparatus 610 and apparatus 620 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center. When implemented in or as a network apparatus, apparatus 610 and / or apparatus 620 may be implemented in an eNodeB in an LTE, LTE-Advanced or LTE-Advanced Pro network or in a gNB or TRP in a 5G NR network, a 6G network, or an IoT network.
[0035] In some implementations, each of apparatus 610 and apparatus 620 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more complex-instruction-set-computing (CISC) processors, or one or more reduced-instruction-set-computing (RISC) processors. In the various schemes described above, each of apparatus 610 and apparatus 620 may be implemented in or as a network apparatus or a UE. Each of apparatus 610 and apparatus 620 may include at least some of those components shown in FIG. 6 such as a processor 612 and a processor 622, respectively, for example. Each of apparatus 610 and apparatus 620 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of apparatus 610 and apparatus 620 are neither shown in FIG. 6 nor described below in the interest of simplicity and brevity.
[0036] In one aspect, each of processor 612 and processor 622 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC or RISC processors. That is, even though a singular term “a processor” is used herein to refer to processor 612 and processor 622, each of processor 612 and processor 622 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure. In another aspect, each of processor 612 and processor 622 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and / or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure. In other words, in at least some implementations, each of processor 612 and processor 622 is a special-purpose machine specifically designed, arranged, and configured to perform specific tasks including those pertaining to fast switch on initial access from legacy radio access to new radio access in mobile communications in accordance with various implementations of the present disclosure.
[0037] In some implementations, apparatus 610 may also include a transceiver 616 coupled to processor 612. Transceiver 616 may be capable of wirelessly transmitting and receiving data. In some implementations, transceiver 616 may be capable of wirelessly communicating with different types of wireless networks of different radio access technologies (RATs) . In some implementations, transceiver 616 may be equipped with a plurality of antenna ports (not shown) such as, for example, four antenna ports. That is, transceiver 616 may be equipped with multiple transmit antennas and multiple receive antennas for multiple-input multiple-output (MIMO) wireless communications. In some implementations, apparatus 620 may also include a transceiver 626 coupled to processor 622. Transceiver 626 may include a transceiver capable of wirelessly transmitting and receiving data. In some implementations, transceiver 626 may be capable of wirelessly communicating with different types of UEs / wireless networks of different RATs. In some implementations, transceiver 626 may be equipped with a plurality of antenna ports (not shown) such as, for example, four antenna ports. That is, transceiver 626 may be equipped with multiple transmit antennas and multiple receive antennas for MIMO wireless communications.
[0038] In some implementations, apparatus 610 may further include a memory 614 coupled to processor 612 and capable of being accessed by processor 612 and storing data therein. In some implementations, apparatus 620 may further include a memory 624 coupled to processor 622 and capable of being accessed by processor 622 and storing data therein. Each of memory 614 and memory 624 may include a type of random-access memory (RAM) such as dynamic RAM (DRAM) , static RAM (SRAM) , thyristor RAM (T-RAM) and / or zero-capacitor RAM (Z-RAM) . Alternatively, or additionally, each of memory 614 and memory 624 may include a type of read-only memory (ROM) such as mask ROM, programmable ROM (PROM) , erasable programmable ROM (EPROM) and / or electrically erasable programmable ROM (EEPROM) . Alternatively, or additionally, each of memory 614 and memory 624 may include a type of non-volatile random-access memory (NVRAM) such as flash memory, solid-state memory, ferroelectric RAM (FeRAM) , magnetoresistive RAM (MRAM) and / or phase-change memory.
[0039] Each of apparatus 610 and apparatus 620 may be a communication entity capable of communicating with each other using various proposed schemes in accordance with the present disclosure. For illustrative purposes and without limitation, a description of capabilities of apparatus 610, as a UE (e.g., UE 110) , and apparatus 620, as a network node (e.g., terrestrial network node 125 or non-terrestrial network node 128) of a network (e.g., wireless network 120 as a 5G / NR mobile network) , is provided below in the context of example processes 700 and 800. Illustrative Processes
[0040] FIG. 7 illustrates an example process 700 in accordance with an implementation of the present disclosure. Process 700 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 700 may represent an aspect of the proposed concepts and schemes pertaining to fast switch on initial access from legacy radio access to new radio access in mobile communications in accordance with the present disclosure. Process 700 may include one or more operations, actions, or functions as illustrated by one or more of blocks. Although illustrated as discrete blocks, various blocks of process 700 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 700 may be executed in the order shown in FIG. 7 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 700 may be executed repeatedly or iteratively. Process 700 may be implemented by or in apparatus 610 and apparatus 620 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 700 is described below in the context of apparatus 610 as a UE (e.g., UE 110) and apparatus 620 as a communication entity such as a network node or base station (e.g., terrestrial network node 125 or non-terrestrial network node 128) of a network (e.g., wireless network 120) . Process 700 may begin at block 710.
[0041] At 710, process 700 may involve processor 612 of apparatus 610, as a UE, camping, via transceiver 616, on a network (e.g., wireless network 120 via apparatus 620 as terrestrial network node 125 or non-terrestrial network node 128) via a first radio access of a first technology while in an idle or inactive mode. Process 700 may proceed from 710 to 720.
[0042] At 720, process 700 may involve processor 612 receiving, via transceiver 616, from the network a broadcast signal of the first technology which may include one or more parameters related to initial access to a second radio access of a second technology. The one or more parameters may enable the UE to synchronize its DL receiver to a carrier frequency or band of the second technology before switching to operate on the second radio access. Process 700 may proceed from 720 to 730.
[0043] At 730, process 700 may involve processor 612 switching, via transceiver 616, to communicate with the network via the second radio access to receive DL signals of the second technology on the carrier frequency or band of the second technology. Additionally, process 700 may involve processor 612 continuing to transmit, via transceiver 616, using the second technology on the carrier frequency or band of the first technology, or switching to transmit using the second technology on the carrier frequency or band of the second technology.
[0044] In some implementations, the first technology comprises a 5G NR RAT in accordance with a 3GPP specification, and the second technology may include a 6G RAT in accordance with another 3GPP specification.
[0045] In some implementations, in receiving the one or more parameters, process 700 may involve processor 612 receiving periodic or on-demand SI for the carrier frequency or band of the second technology. In some implementations, the SI may include synchronization signal information, as well as RACH, uplink and / or downlink configurations for the carrier frequency or band of the second technology.
[0046] In some implementations (e.g., under Alternative 3-1) , in switching, process 700 may involve processor 612 performing certain operations. For instance, process 700 may involve processor 612 initiating a RACH procedure by transmitting to the network a first message of the second technology on a first carrier of the first technology and / or synchronizing its DL receiver on a DL carrier frequency or band of the second technology. Moreover, process 700 may involve processor 612 completing the RACH procedure by exchanging messages of the second technology with the network on a second carrier of the second technology.
[0047] In some implementations (e.g., under Alternative 3-2 and / or Alternative 3-3) , in switching, process 700 may involve processor 612 performing certain operations. For instance, process 700 may involve processor 612 initiating a RACH procedure by transmitting to the network a first message of the first technology on a first carrier of the first technology and synchronizing its DL receiver on the DL carrier frequency or band of the second technology.
[0048] Moreover (e.g., under Alternative 3-2-1) , process 700 may involve processor 612 completing the RACH procedure by exchanging messages of the second technology with the network on a second carrier of the second technology.
[0049] Alternatively (e.g., under Alternative 3-2-2) , process 700 may involve processor 612 receiving from the network a second message of the second technology on the first carrier of the first technology. Additionally, process 700 may involve processor 612 transmitting to the network a third message of the second technology on a second carrier of the second technology.
[0050] Still alternatively (e.g., under Alternative 3-3) , process 700 may involve processor 612 completing the RACH procedure by: (a) exchanging with the network second, third and fourth messages of the first technology on the first carrier of the first technology; and (b) transmitting to the network a fifth message of the second technology on a second carrier of the second technology.
[0051] In some implementations (e.g., under Alternative 3-2 and / or Alternative 3-3) , in switching, process 700 may involve processor 612 receiving, from the network, a subsequent message including either or both of UL and DL configurations for the DL carrier frequency or band of the second technology.
[0052] FIG. 8 illustrates an example process 800 in accordance with an implementation of the present disclosure. Process 800 may represent an aspect of implementing various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 800 may represent an aspect of the proposed concepts and schemes pertaining to fast switch on initial access from legacy radio access to new radio access in mobile communications in accordance with the present disclosure. Process 800 may include one or more operations, actions, or functions as illustrated by one or more of blocks. Although illustrated as discrete blocks, various blocks of process 800 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks / sub-blocks of process 800 may be executed in the order shown in FIG. 8 or, alternatively, in a different order. Furthermore, one or more of the blocks / sub-blocks of process 800 may be executed repeatedly or iteratively. Process 800 may be implemented by or in apparatus 610 and apparatus 620 as well as any variations thereof. Solely for illustrative purposes and without limiting the scope, process 800 is described below in the context of apparatus 610 as a UE (e.g., UE 110) and apparatus 620 as a communication entity such as a network node or base station (e.g., terrestrial network node 125 or non-terrestrial network node 128) of a network (e.g., wireless network 120) . Process 800 may begin at block 810.
[0053] At 810, process 800 may involve processor 622 of apparatus 620, as a network node of a network, transmitting, via transceiver 626, to a UE (e.g., apparatus 610) , while the UE is camped on the network in an idle or inactive mode via a first radio access of a first technology, a broadcast signal of the first technology that may include one or more parameters related to initial access to a second radio access of a second technology. The one or more parameters may enable the UE to synchronize and operate on DL to a carrier frequency or band of the second technology before switching to operate on the second radio access. Process 800 may proceed from 810 to 820.
[0054] At 820, process 800 may involve processor 622 receiving, via transceiver 626, from the UE one or more messages after the UE switches to camping on the network via the second radio access of the second technology.
[0055] In some implementations, the first technology comprises a 5G NR RAT in accordance with a 3GPP specification, and the second technology may include a 6G RAT in accordance with another 3GPP specification.
[0056] In some implementations, in transmitting the one or more parameters, process 800 may involve processor 622 transmitting periodic or on-demand SI for the carrier frequency or band of the second technology. In some implementations, the periodic SI may include synchronization signal information, as well as RACH, uplink and / or downlink configurations for the carrier frequency or band of the second technology.
[0057] In some implementations (e.g., under Alternative 3-1) , in switching, process 800 may involve processor 622 performing certain operations. For instance, process 800 may involve processor 622 performing a RACH procedure with the UE by receiving a first message of the second technology on a first carrier of the first technology as the UE synchronizes its DL receiver on a DL carrier frequency or band of the second technology. Moreover, process 800 may involve processor 622 completing the RACH procedure by exchanging messages of the second technology with the UE on a second carrier of the second technology.
[0058] In some implementations (e.g., under Alternative 3-2 and / or Alternative 3-3) , in switching, process 800 may involve processor 622 performing certain operations. For instance, process 800 may involve processor 622 performing a RACH procedure with the UE by receiving a first message of the first technology on a first carrier of the first technology as the UE synchronizes its DL receiver on the DL carrier frequency or band of the second technology.
[0059] Moreover (e.g., under Alternative 3-2-1) , process 800 may involve processor 622 completing the RACH procedure by exchanging messages of the second technology with the UE on a second carrier of the second technology.
[0060] Alternatively (e.g., under Alternative 3-2-2) , process 800 may involve processor 622 completing the RACH procedure by: (a) transmitting to UE a second message of the second technology on the first carrier of the first technology; and (b) receiving from the UE a third message of the second technology on a second carrier of the second technology.
[0061] Still alternatively (e.g., under Alternative 3-3) , process 800 may involve processor 622 completing the RACH procedure by: (a) exchanging with the UE second, third and fourth messages of the first technology on the first carrier of the first technology; and (b) receiving from the UE a fifth message of the second technology on a second carrier of the second technology.
[0062] In some implementations, process 800 may further involve processor 622 transmitting, via transceiver 626, to the UE a subsequent message comprising either or both of uplink and downlink configurations for the DL carrier frequency or band of the second technology. Additional Notes
[0063] The herein-described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected" , or "operably coupled" , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable" , to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and / or physically interacting components and / or wirelessly interactable and / or wirelessly interacting components and / or logically interacting and / or logically interactable components.
[0064] Further, with respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.
[0065] Moreover, it will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to, ” the term “having” should be interpreted as “having at least, ” the term “includes” should be interpreted as “includes but is not limited to, ” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an, " e.g., “a” and / or “an” should be interpreted to mean “at least one” or “one or more; ” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations, " without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B. ”
[0066] From the foregoing, it will be appreciated that various implementations of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Claims
1.A method, comprising:camping, by a processor of a user equipment (UE) , on a network via a first radio access of a first technology while in an idle or inactive mode;receiving, by the processor, from the network a broadcast signal of the first technology including one or more parameters related to initial access to a second radio access of a second technology, the one or more parameters enabling the UE to synchronize its downlink (DL) receiver to a carrier frequency or band of the second technology before switching to operate on the second radio access; andswitching, by the processor, to communicate with the network via the second radio access to receive DL signals of the second technology on the carrier frequency or band of the second technology.2.The method of claim 1, wherein the first technology comprises a 5th Generation New Radio (5G NR) radio access technology (RAT) in accordance with a 3rd Generation Partnership Project (3GPP) specification, and wherein the second technology comprises a 6th Generation (6G) RAT in accordance with another 3GPP specification.3.The method of claim 1, wherein the receiving of the one or more parameters comprises receiving periodic or on-demand system information (SI) for the carrier frequency or band of the second technology.4.The method of claim 3, wherein the periodic SI comprises synchronization signals information, as well as random access channel (RACH) , uplink and downlink configurations for the carrier frequency or band of the second technology.5.The method of claim 1, wherein the switching comprises initiating a random access channel (RACH) procedure by transmitting to the network a first message of the second technology on a first carrier of the first technology and synchronizing the DL receiver on a DL of carrier frequency or band of the second technology.6.The method of claim 5, wherein the switching further comprises completing the RACH procedure by exchanging messages of the second technology with the network on a second carrier of the second technology.7.The method of claim 1, wherein the switching comprises initiating a random access channel (RACH) procedure by transmitting to the network a first message of the first technology on a first carrier of the first technology and synchronizing the DL receiver on a DL carrier frequency or band of the second technology.8.The method of claim 7, wherein the switching further comprises completing the RACH procedure by exchanging messages of the second technology with the network on a second carrier of the second technology.9.The method of claim 7, wherein the switching further comprises completing the RACH procedure by:receiving from the network a second message of the second technology on the first carrier of the first technology; andtransmitting to the network a third message of the second technology on a second carrier of the second technology.10.The method of claim 7, wherein the switching further comprises completing the RACH procedure by:exchanging with the network second, third and fourth messages of the first technology on the first carrier of the first technology; andtransmitting to the network a fifth message of the second technology on a second carrier of the second technology.11.The method of claim 7, wherein the switching further comprises receiving from the network a subsequent message comprising either or both of uplink and downlink configurations for the DL carrier frequency or band of the second technology.12.A method, comprising:transmitting, by a processor of a network node of a network, to a user equipment (UE) , while the UE is camped on the network in an idle or inactive mode via a first radio access of a first technology, a broadcast signal of the first technology including one or more parameters related to initial access to a second radio access of a second technology, the one or more parameters enabling the UE to synchronize and operate on downlink (DL) to a carrier frequency or band of the second technology before switching to operate on the second radio access; andreceiving, by the processor, from the UE one or more messages after the UE switches to operate on the network via the second radio access of the second technology.13.The method of claim 12, wherein the first technology comprises a 5th Generation New Radio (5G NR) radio access technology (RAT) in accordance with a 3rd Generation Partnership Project (3GPP) specification, and wherein the second technology comprises a 6th Generation (6G) RAT in accordance with another 3GPP specification.14.The method of claim 12, wherein the transmitting of the one or more parameters comprises transmitting periodic or on-demand system information (SI) for the carrier frequency or band of the second technology.15.The method of claim 14, wherein the periodic or on-demand SI comprises synchronization signal information, as well as random access channel (RACH) , uplink and downlink configurations for the carrier frequency or band of the second technology.16.The method of claim 12, further comprising:performing, by the processor, a random access channel (RACH) procedure with the UE by receiving a first message of the second technology on a first carrier of the first technology as the UE synchronizes its DL receiver on a DL carrier frequency or band of the second technology.17.The method of claim 16, further comprising:completing, by the processor, the RACH procedure by exchanging messages of the second technology with the UE on a second carrier of the second technology.18.The method of claim 12, further comprising:performing, by the processor, a random access channel (RACH) procedure with the UE by receiving a first message of the first technology on a first carrier of the first technology as the UE synchronizes its DL receiver on a DL carrier frequency or band of the second technology.19.The method of claim 18, further comprising:completing, by the processor, the RACH procedure by exchanging messages of the second technology with the UE on a second carrier of the second technology.20.The method of claim 18, further comprising:completing, by the processor, the RACH procedure by:transmitting to UE a second message of the second technology on the first carrier of the first technology; andreceiving from the UE a third message of the second technology on a second carrier of the second technology.21.The method of claim 19, further comprising:completing, by the processor, the RACH procedure by:exchanging with the UE second, third and fourth messages of the first technology on the first carrier of the first technology; andreceiving from the UE a fifth message of the second technology on a second carrier of the second technology.22.The method of claim 18, further comprising:transmitting to the UE a subsequent message comprising either or both of uplink and downlink configurations for the DL carrier frequency or band of the second technology.