Method, device and system for fast path switching in wireless communication

Abstract

A plurality of communication paths for communication between a user equipment (UE) and a wireless communication network is first established, and then a handover between these paths is initiated. Signaling including an explicit indication that the UE will switch between the plurality of communication paths is sent to the UE that has at least established the plurality of communication paths and is received by the UE. In response to the explicit indication, communication is switched between the communication paths. At least one of the communication paths includes a relay path between the UE and the wireless communication network via another UE. Establishing the plurality of paths before the handover can help achieve a fast handover with low latency and / or no traffic loss.

Description

[0001] Cross-reference to related applications

[0002] This application is related to and claims the benefit of U.S. Provisional Patent Application No. 63 / 031,005, filed on May 28, 2020, entitled “METHODS, APPARATUS, AND SYSTEMS FOR FAST LINK SWITCHING IN WIRELESS COMMUNICATIONS WITH USER EQUIPMENT (UE) COOPERATION,” and U.S. Patent Application No. 17 / 316,903, filed on May 11, 2021, entitled “METHODS, APPARATUS, AND SYSTEMS FOR FAST LINK SWITCHING IN WIRELESS COMMUNICATIONS WITH USER EQUIPMENT (UE) COOPERATION.” The entire contents of these applications are incorporated herein by reference. Technical Field

[0003] The present application relates generally to communications in wireless communication networks, and more particularly to communications involving relay paths and user equipment (UE) collaboration. Background Art

[0004] In Long Term Evolution (LTE), device-to-device (D2D) technology, which allows UEs to communicate directly with each other, has been studied and specified. LTE D2D research focuses primarily on communication between D2D devices. For new radio (NR) vehicle-to-everything (V2X) scenarios, D2D research focuses on the "Uu link" transmission between the gNodeB (gNB) and UEs, as well as sidelink (SL) transmission between UEs.

[0005] UE collaboration is a communication technology that focuses on the coordination process between UEs in a group. UE collaboration can be used to enhance system throughput, coverage, and capacity, as well as improve communication latency and reliability. UE collaboration can benefit scenarios such as V2X, enhanced mobile broadband (eMBB), and ultra-reliable low latency communication (URLLC).

[0006] UE cooperation can be achieved by a group of UEs helping each other using Uu link transmission and / or sidelink transmission. UE cooperation involves the interaction between UEs in the group for transmission and reception.

[0007] Relay is another technology related to the above scenario and is widely used to improve the coverage of wireless access networks. Relay nodes are mainly deployed by network operators at fixed sites. So-called "UE relay" provides a more flexible alternative. There are different types of UE relay, including layer 2 (L2) relay and layer 3 (L3) relay. Some current mobile relay technologies are only used to meet urgent needs such as basic public safety, where the data rate is low and the latency requirements are not very high.

[0008] Other relay-based technologies that are more generally suitable for various scenarios or applications and that may improve communication system performance may be desirable. Summary of the Invention

[0009] Support for multiple path establishment and inter-path switching, with at least one relay path, can be used to improve system performance in terms of latency or throughput for emerging and important applications. Techniques involving switching between established paths including one or more relay paths can be particularly useful for applications in scenarios such as in-coverage and out-of-coverage scenarios.

[0010] One aspect of the present disclosure relates to a method, the method involving: a UE receiving signaling, the signaling including an explicit indication that the UE will switch between multiple communication paths, the multiple communication paths having been established for communication with a wireless communication network before receiving the signaling; and the UE switching between the first communication path and the second communication path in response to the explicit indication to communicate with the wireless communication network. The multiple communication paths include a first communication path and a second communication path. The first communication path includes a relay path between the UE and the wireless communication network. The second communication path may include a direct path or another relay path between the UE and the wireless communication network.

[0011] Another method involves: communicating signaling by a first UE participating in a relay path including a first communication path between a wireless communication network and a second UE, the signaling including an explicit indication that the second UE will switch between the first communication path and a second communication path to communicate with the wireless communication network; and operating the first UE in a manner consistent with the switching of the second UE between the first communication path and the second communication path. The first communication path and the second communication path are a plurality of communication paths that have been established for communication between the wireless communication network and the second UE prior to communicating the signaling.

[0012] Another aspect of the present disclosure relates to a method that involves determining whether a path switching condition is satisfied. The path switching condition includes a condition for a UE to switch between multiple communication paths, the multiple communication paths having been established for communication with a wireless communication network prior to the determination. The method may also involve, in response to determining that the path switching condition is satisfied, sending signaling to cause the UE to switch between the first communication path and the second communication path to communicate with the wireless communication network. The multiple communication paths include a first communication path and a second communication path, the first communication path including a relay path between the UE and the wireless communication network. The signaling includes an explicit indication that the UE will switch between the first communication path and the second communication path to communicate with the wireless communication network.

[0013] According to another aspect of the present disclosure, an apparatus includes a communication interface; a processor coupled to the communication interface; and a non-transitory computer-readable storage medium coupled to the processor, storing a program executed by the processor, the program including instructions for performing the method disclosed herein.

[0014] According to another aspect, a computer program product includes a non-transitory computer-readable storage medium storing a program including instructions for performing the method disclosed herein.

[0015] Other aspects and features of the embodiments of the present disclosure will become apparent to those skilled in the art with reference to the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For a more complete understanding of the present embodiment and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, by way of example.

[0017] Figure 1 An exemplary communication system is shown that implements aspects of the present disclosure in some embodiments.

[0018] Figure 2 is a block diagram of another exemplary communication system illustrating multiple communication links.

[0019] Figure 3is a block diagram of another exemplary communication system, illustrating another multi-link scenario.

[0020] Figure 4 and Figure 5 is a block diagram of another exemplary communication system illustrating additional multi-link scenarios.

[0021] Figure 6 is a signal flow diagram illustrating an example of establishing a sidelink segment of a relay link between a remote UE and a relay UE.

[0022] Figure 7 is a block diagram illustrating an example of link switching behavior in an embodiment.

[0023] Figure 8 A flowchart illustrating a method provided by an embodiment is included.

[0024] 9A to 9F is a signal flow diagram illustrating an exemplary timeline and signaling / data flow for fast link (path) switching provided by an embodiment.

[0025] Figure 10A and Figure 10B is a block diagram of an exemplary device that can implement the methods and teachings provided by the present disclosure.

[0026] Figure 11 is a block diagram of an example telecommunications network provided by an embodiment.

[0027] Figure 12 is a block diagram of an example of a network serving two UEs. DETAILED DESCRIPTION

[0028] As described above, relay links can be used for purposes such as improving system performance in terms of latency or throughput for emerging and important applications. Examples of new use cases include video monitoring and feedback for industrial manufacturing or for public agencies such as firefighters or police to enhance public safety services. These use cases or other use cases may have goals or requirements that cannot be met by current UE relay link designs. For example, such goals or requirements may include one or more of the following: higher data throughput, such as at the level of tens of megabits per second (Mbps); low latency, such as on the order of milliseconds (ms); or service continuity when switching communications between links. As disclosed herein, link switching through UE collaboration and one or more relay links can provide a feasible solution that meets one or more of such goals or requirements. Some embodiments herein relate to providing support for the establishment of multiple links including one or more relay links through configuration or other means, and enabling fast switching between multiple links. For example, some embodiments relate to scenarios in which multiple UE relay links are established, and can support fast path switching without packet loss to meet occasional service continuity requirements of business use cases. The ultimate goal of fast path switching may be to achieve so-called "0ms switching" or so-called "0ms interruption" switching to provide seamless switching and seamless UE experience when switching communications between paths.

[0029] Fast path switching or "0ms" path switching may have different reference points. For example, if the reference point is at the packet data convergence protocol (PDCP) layer, a 0ms path switch may mean that one PDCP packet is sent on one link, and the next PDCP packet is sent on another link without delay. If the reference point is at the physical (PHY) layer, a 0ms path switch may mean that the data in the first time slot is sent on one link, and the data in the next time slot is sent on another link. Generally, as used herein, fast link switching, fast path switching, 0ms link switching, and 0ms path switching all refer to switching communications between multiple links or paths with a switching time of approximately 1ms or less, compared to switching times of approximately hundreds of ms or more for other switching technologies.

[0030] The present disclosure covers embodiments that address several problems, including multi-link establishment for in-coverage and out-of-coverage remote UEs, signaling for fast path switching, which may include any of various types of signaling or messaging, and procedures associated with link or path switching. These procedures include network device procedures and different types of UE procedures. Links or paths can be established in any of a variety of ways, including but not limited to through configuration. For example, in some embodiments, the links or paths can be configured by higher layer signaling such as radio resource control (RRC) signaling, while in other embodiments, at least some of the information used to establish the paths or links can be obtained from one or more sources such as initial cell search, a master information block (MIB), or a system information block (SIB).

[0031] First reference Figure 1 , illustrates an exemplary communication system 100 for implementing aspects of the present disclosure in some embodiments. Generally, system 100 enables multiple wireless or wired elements to transmit data and / or other content. The purpose of system 100 can be to provide content (e.g., any one or more of voice, data, video, text, collectively referred to herein as "data") via broadcast, unicast, multicast, user device to user device, etc. System 100 can operate efficiently by sharing communication resources such as bandwidth.

[0032] In this example, the communication system 100 includes electronic devices (EDs) 110a to 110c, radio access networks (RANs) 120a and 120b, a core network 130, a public switched telephone network (PSTN) 140, the Internet 150, and other networks 160. Figure 1 A certain number of these components or elements are shown, but any reasonable number of these components or elements may be included in system 100 .

[0033] The EDs 110a to 110c are configured to operate, communicate, or both within the system 100. For example, the EDs 110a to 110c are configured to transmit, receive, or both via a wireless communication channel. Each ED 110a to 110c represents any suitable end-user device configured for wireless operation and may include, or may be referred to as, a UE, a wireless transmit / receive unit (WTRU), a mobile station, a mobile subscriber unit, a cellular phone, a station (STA), a machine type communication (MTC) device, a personal digital assistant (PDA), a smartphone, a laptop, a computer, a touchpad, a wireless sensor, or a consumer electronic device.

[0034] exist Figure 1 In the embodiment, RANs 120a and 120b include base stations 170a and 170b, respectively. Each base station 170a and 170b is configured to wirelessly connect to one or more EDs 110a to 110c to enable access to any other base stations 170a and 170b, the core network 130, the PSTN 140, the Internet 150, and / or other networks 160. For example, base stations 170a and 170b may be or include one or more of several well-known devices, such as a base transceiver station (BTS), a Node-B (NodeB), an evolved NodeB (eNodeB), a Home eNodeB, a gNB (next generation NodeB), a transmission point (TP), a transmission reception point (TRP), a site controller, an access point (AP), or a wireless router. Alternatively or collectively, any ED 110a to 110c can be configured to connect, access, or communicate with any other base station 170a and 170b, the Internet 150, the core network 130, the PSTN 140, other networks 160, or any combination thereof. Optionally, the system can include a RAN, such as RAN 120b, where the corresponding base station 170b accesses the core network 130 via the Internet 150, as shown.

[0035] EDs 110a to 110c and base stations 170a and 170b are examples of communication devices that may be used to implement some or all of the functions or embodiments described herein. Figure 1In the illustrated embodiment, base station 170a forms part of the RAN 120a, which may include other base stations, one or more base station controllers (BSCs), one or more radio network controllers (RNCs), relay nodes, elements, and / or devices. Any base station 170a, 170b may be a standalone element, as shown, or multiple elements distributed across the corresponding RAN, and so on. Furthermore, base station 170b forms part of the RAN 120b, which may include other base stations, elements, and / or devices. Each base station 170a and 170b may be configured to operate to transmit and / or receive wireless signals within a specific geographic area or region (sometimes referred to as a coverage area). Cells may be further divided into cell sectors; for example, base stations 170a and 170b may employ multiple transceivers to provide service to multiple sectors. In some embodiments, base stations 170a and 170b may be implemented as pico or femto nodes, where the radio access technology supports such pico or femto nodes. In some embodiments, MIMO technology may be employed, with multiple transceivers for each coverage area. The number of RANs 120a and 120b shown is merely exemplary. Any number of RANs may be considered when designing system 100.

[0036] Base stations 170a and 170b communicate with one or more of EDs 110a through 110c using wireless communication links (e.g., RF, μWave, IR, etc.) over one or more air interfaces 190. Air interfaces 190 may utilize any suitable radio access technology. For example, system 100 may implement one or more channel access methods in air interfaces 190, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or single-carrier FDMA (SC-FDMA).

[0037] Base stations 170a and 170b can implement universal mobile telecommunication system (UMTS) universal terrestrial radio access (UTRA) to establish air interface 190 using wideband CDMA (WCDMA). In doing so, base stations 170a and 170b can implement protocols such as HSPA, HSPA+, and optionally HSDPA, HSUPA, or both. Alternatively, base stations 170a and 170b can establish air interface 190 using LTE, LTE-A, and / or LTE-B with evolved UMTS terrestrial radio access (E-UTRA). It is contemplated that system 100 may utilize multi-channel access capabilities, including those described above. Other wireless technologies used to implement the air interface include IEEE 802.11, 802.15, 802.16, CDMA2000, CDMA2000 1X, CDMA2000 EV-DO, IS-2000, IS-95, IS-856, GSM, EDGE, and GERAN. Of course, other multiple access schemes and wireless protocols may also be used.

[0038] RANs 120a and 120b communicate with the core network 130 to provide various services, such as voice, data, and other services, to EDs 110a through 110c. It will be appreciated that RANs 120a and 120b and / or the core network 130 may communicate directly or indirectly with one or more other RANs (not shown), which may or may not be directly served by the core network 130 and may or may not utilize the same radio access technology as RAN 120a, RAN 120b, or both. The core network 130 may also serve as a gateway access between (i) RANs 120a and 120b and / or EDs 110a through 110c, and (ii) other networks, such as PSTN 140, Internet 150, and other networks 160. Furthermore, some or all of EDs 110a through 110c may include functionality to communicate with different wireless networks over different wireless links using different wireless technologies and / or protocols. PSTN 140 may include a circuit-switched telephone network for providing plain old telephone service (POTS). Internet 150 may include a computer network, a subnet (intranet), or both, incorporating protocols such as IP, TCP, and UDP. EDs 110a through 110c may be multimode devices capable of operating according to multiple wireless access technologies and include the multiple transceivers necessary to support these technologies.

[0039] It is conceivable that Figure 1 The communication system 100 shown can support NR cells, which can also be called hypercells. Each NR cell includes one or more base stations. The base stations of the NR cell can use the same NR cell ID. The NR cell ID is a logical assignment for all physical base stations in the NR cell and can be carried in the broadcast synchronization signal. The NR cell can be dynamically configured. The boundaries of the NR cell can be flexible, and the system dynamically adds base stations to the NR cell or removes base stations from the NR cell.

[0040] In one embodiment, an NR cell may have one or more base stations within the NR cell that transmit UE-specific data channels serving the UE. The one or more base stations associated with the UE-specific data channels are also UE-specific and transparent to the UE. Multiple parallel data channels within a single NR cell may be supported, for example, each data channel serving a different UE.

[0041] UE (e.g. Figure 1 Direct communication between EDs 110a to 110c) in the UEs is also possible, and direct communication links 195 between UEs are possible in the Figure 1For example, the UEs communicate directly with each other via sidelinks to enable UE cooperation and relay links in some embodiments, as described in at least further detail below.

[0042] A relay link technology that can be used to improve the coverage of a wireless communication network (for example, at the edge of a cell or indoors) involves relaying data between a remote UE and a network device through a relay UE. For example, in an uplink operation where data originates from a remote UE and is sent to a network device, the remote UE can be referred to as a source UE (SUE) and the relay UE can be referred to as a cooperative UE (CUE). For downlink communications, data is sent to a remote UE, which can be referred to as a target UE (TUE). These uplink and downlink relay technologies can involve transmitting data between a CUE and a SUE or TUE over a direct communication link (for example, a side link between a CUE and a SUE or TUE). A remote UE (whether a source UE or a target UE) can be assisted by these technologies. For example, if a remote UE is in a coverage blind spot, a relay link can provide the remote UE with a better connection than other connections available to the remote UE.

[0043] This disclosure focuses primarily on multi-link applications, where a remote UE is assisted in some way by one or more relay UEs. Although this document primarily refers to a "relay UE," a relay UE may also be referred to herein and elsewhere as a CUE or UE relay. A relay link is a link involving at least one intermediate component, including at least one relay UE. A relay link enables communication between a communication network and a remote UE. The remote UE may or may not be within network coverage.

[0044] In a cellular network, a UE can connect directly to the network via a direct communication link (e.g., a so-called "Uu" link or another cellular link) over the Uu air interface. Outside of network coverage, or even within coverage, a UE can connect indirectly to the network, for example, via a relay node or relay UE. This can improve performance parameters such as network coverage or system throughput. As the UE moves around or the UE's operating environment changes over time, the communication link between the UE and network equipment, such as the gNB, may become weaker. This applies to both direct and indirect communication links between the UE and the communications network. For example, to maintain connectivity or performance, it may be desirable to occasionally switch links or paths for communications between the UE and the network. This is referred to herein as a link switch or path switch. A path can consist of one or more segments, and in the case of a relay path, at least two segments and at least one intermediate component (e.g., a relay UE). While elsewhere in the art, a "segment" may be equivalently referred to as a "link," this application refers to a link as comprising one or more segments. Therefore, in this document, "link" and "path" are used interchangeably.

[0045] For some commercial use cases, such as surveillance video for public safety (e.g., firefighters or police officers on scene) or real-time factory monitoring and control, targets or requirements for parameters such as packet loss or latency due to path switching may be quite stringent in order to maintain high-quality service continuity. Fast link or path switching to meet these targets or requirements may be very useful.

[0046] Under further enhancement D2D (FeD2D), path switching in LTE has been studied, focusing on wearable devices as remote UEs and mobile phones as relay nodes. The relay architecture proposed under FeD2D is L2 relaying, in which the RAN has more control. In FeD2D, path switching is achieved by reconfiguring the link to be used by the remote UE. While this may not result in any packet loss, reconfiguration takes time and results in increased latency, which may be unacceptable for at least some use cases. The situation is potentially worse if L3 relaying is used, as the RAN is unaware of the remote UE and has no control over either the relay UE or the remote UE. The RAN will be unaware of link weakness or failure, which may result in packet loss. As studied in FeD2D, path switching in L3 relaying can take longer than in L2 relaying. For example, with the emergence of new applications for sidelink-based relaying in 5G NR, with higher data rates and more stringent service continuity objectives or requirements, current path switching techniques may not be sufficient.

[0047] Several link or path switching scenarios are considered herein as illustrative examples. It should be understood that the embodiments are not limited to these specific scenarios in any way, and the features disclosed herein may be applicable to other scenarios in addition or in lieu thereof.

[0048] Figure 2 2 is a block diagram of another exemplary communication system illustrating multiple communication links according to a scenario. The exemplary system 200 includes a network device 202 (also referred to herein as a network apparatus), and UEs including a relay UE 222 and a remote UE 224. The communication between the UEs 222, 224 and the network device 202 is via a direct communication link (in Figure 2 2 (shown as an example in the figure as "Uu" link 210), and direct sidelink communication between UEs is via sidelink 212. Examples of implementation options for these components and communications between these components are provided elsewhere herein. For example, network device 202 can be a network device or apparatus, such as Figure 1 The base stations 170a and 170b in FIG. 1 ... , the UE may be Figure 1 ED 110a to 110c in.

[0049] Figure 2 This diagram illustrates a scenario where both relay UE 222 and remote UE 224 are "within coverage" (within a geographic area in direct communication with network device 202). In the illustrated example, two links exist between network device 202 and remote UE 224. One link is a direct link, illustrated as Uu link 210. The other link is an indirect relay link, which includes a direct link segment between network device 202 and relay UE 222 and a sidelink segment between relay UE 222 and remote UE 224. In this scenario, both links are connected to a gNB (exemplified by network device 202), and a handover between these two links may be referred to as an intra-gNB link handover.

[0050] Figure 3 is a block diagram of another exemplary communication system illustrating another multi-link scenario. Example 300 differs from Example 200 in that the remote UE 224 is “out of coverage” (outside the geographic area in direct communication with the network device 202), but is in direct communication with the network device 202. Figure 3 In example 300, there are still two links between network device 202 and remote UE 224. Figure 3Each of the two links in is an indirect relay link and includes a direct link segment between network device 202 and relay UE 222, 326, and a sidelink segment between each relay UE 222, 326 and remote UE 224 on sidelink 212, 314. Considering the example above where the two links are connected to a gNB that is network device 202, Figure 3 Switching between two relay links in a gNB is another possible scenario for intra-gNB link switching.

[0051] Different links do not necessarily need to involve Figure 2 and Figure 3 The same network device 202 is shown. Figure 4 and Figure 5 is a block diagram of another exemplary communication system, illustrating additional multi-link scenarios in which a UE communicates with different network devices.

[0052] exist Figure 4 In example 400, network devices 402, 404 may be, for example, different TRPs, with which a relay UE 422 and a remote UE 424 communicate over Uu direct link segments 410, 412. The remote UE 424 is within the coverage of the network device 402 but outside the coverage of the network device 404. The relay UE 422 is within the coverage of the network device 404 but outside the coverage of the network device 402. Figure 4 In FIG, there are two links between the remote UE 424 and the network device, including a direct link between the remote UE 424 and the network device 402 and an indirect relay link between the remote UE and the network device 404. The indirect relay link includes a direct link segment between the network device 404 and the relay UE 422, and a sidelink segment between the relay UE and the remote UE 424 on the sidelink 414. Considering the example in which each link is connected to a different gNB as the network devices 402 and 404, Figure 4 The switching between the two links in a GPIB is a form of inter-gNB link switching.

[0053] Figure 5 An example scenario of inter-network device handover (e.g., inter-gNB link handover) is provided. Figure 5 The example 500 in Figure 4 Example 400 is similar to that in Figure 5 , the remote UE 424 is out of the coverage of the network device 402 and the network device 404, Figure 5 There are two indirect relay links instead of Figure 4 A direct link and an indirect relay link in the. Figure 5Each relay link in includes a direct link segment 410 , 412 between the network device 402 , 404 and the relay UE 422 , 526 , and a sidelink segment between each relay UE and the remote UE 424 on a sidelink 414 , 516 .

[0054] Figures 2 to 5

[0014] This section describes an exemplary communication system and multi-link scenario. The present disclosure is not limited to such scenarios. Typically, multiple links can be established between a communication network and a UE. These links include at least one relay link, and other links may include other relay links and / or direct links between a network device and the UE.

[0055] Regarding the relay link, the relay link may include one or more relay UEs. For example, the relay link may include a direct link segment between the network device and the relay UE within the coverage area, such as a Uu link segment, and one or more side link segments. Multiple relay UEs can communicate with each other via the side link, and not all relay UEs need to be within the coverage area. For example, an out-of-coverage UE can communicate with the in-coverage relay UE and the out-of-coverage remote UE via the corresponding side link. Therefore, in some embodiments, the relay link may involve one or more relay UEs and one or more other UEs for assisting the remote UE. The assisting UE may be implemented or classified as another remote UE or another relay UE, and may therefore be referred to as a "helping" remote UE, a helping relay UE, an assisting relay UE, or some other variant.

[0056] To ensure fast link or path switching and service continuity, in some embodiments, multiple links are established between the communications network and the remote UE. These links include at least one indirect relay link and may also include one or more direct links at any time. This can better enable the RAN to apply dynamic path switching, for example, without requiring the establishment or re-establishment of new links, such as through configuration or reconfiguration, when performing a switch. References to establishing or configuring links or paths are intended to be understood in a general sense and do not imply any specific connection establishment protocol or procedure. For direct links, such as those over the Uu interface, some link parameters may not be derived from higher-layer signaling configuration, but rather from system information such as MIBs / SIBs. However, this can still be considered a form of link establishment or configuration. During link establishment / configuration, a handshake procedure may occur between the network device and the UE. After these procedures are completed, a full or partial protocol stack is established between the network device and the UE, making the link ready for transmission / reception. The link may support full or partial functionality from lower protocol stack layers to certain upper layers for data communication, not just the lower protocol stack layers.

[0057] Link or path switching may involve the following features, operations or steps: establishing a multi-link connection, where the link or path information may include any of a variety of attributes or parameters; explicitly or implicitly sending a fast path switching signal consistent with the signaling design for fast switching; and completing one or more switching operations / processes consistent with the fast switching behavior of the network device and the UE (including at least the relay UE and the remote UE).

[0058] Potential advantages of the proposed scheme include low-latency or even 0ms link or path switching, with lossless transmission (in the sense of no packet or flow loss) during the switching, which can help meet strict business use case goals or requirements on parameters such as service continuity.

[0059] In some embodiments, multi-link or multi-path connections can be established simultaneously because there are multiple established links or paths at the same time. The links can be established together (for example, using the same signaling, such as radio resource control (RRC) signaling, which includes the corresponding configuration / reconfiguration of multiple links), or they can be established separately (for example, using different signaling, such as separate RRC signaling for the configuration / reconfiguration of each link, or using initial access technology to establish a direct link). This document uses "simultaneously" and similar terms to express the concept of establishing multiple links and being able to communicate at the same time, and therefore can be used for fast link switching. It should be noted that after establishing multiple links, even if these links can have communication capabilities from the perspective of the physical layer, in some embodiments, these links may not be used for data communication at the same time, and only one of the links is used primarily for data communication at a time; or, in some embodiments or at certain times, multiple links can be used for data communication at the same time.

[0060] A link or path may comprise only a direct link segment, such as a Uu link segment, or, in the case of an indirect relay link, a direct link segment and one or more sidelink segments.

[0061] The information related to the remote UE link or path (also generally referred to herein as the configuration of the remote UE link or path) may include information such as the relay UE ID or other form of identifier of each relay UE involved in the link or path (if any); and the remote UE ID or other form of identifier of the remote UE. Figure 5For example, the configuration of the communication link between network device 402 and remote UE 424 may include respective identifiers of relay UE 526 and the remote UE, and the configuration of the communication link between network device 404 and the remote UE may include respective identifiers of relay UE 422 and the remote UE. A UE radio network temporary identifier (RNTI) is a non-limiting example of a UE identifier that may be used in the configuration.

[0062] Additionally or alternatively, the link or path configuration may include other information. For example, the configuration may include information indicating one or more direct link attributes or direct link segment attributes, such as one or more of the following: a control resource set (CORESET), a reference signal (RS), a modulation and coding scheme (MCS), a bandwidth part (BWP), and a hybrid automatic repeat request (HARQ) process identifier (ID). Additionally or alternatively, information indicating one or more sidelink attributes or sidelink segment attributes may be included in the relay link configuration. Examples include any one or more of the following: a resource pool, a RS, and a HARQ process ID.

[0063] Link establishment may be initiated by a network device (e.g., a gNB). This may include, for example, any one or more of the following operations: link measurement and reporting, establishing communication for the link, and completing link configuration. For example, RRC signaling may be used to complete the configuration. An RRC configuration / reconfiguration signal or similar signal may be sent, for example, from the gNB to the remote UE to establish the link connection, and an RRC configurationComplete / reconfigurationComplete or similar signal may be sent from the remote UE to the gNB / relay UE to complete the link configuration / establishment. For a relay link, the direct link segment between the relay UE and the gNB may be established according to, for example, the normal access procedure defined in NR Release 15, so in some embodiments, only the SL segment may need to be established. Similarly, in some embodiments, the establishment of the direct link between the remote UE and the gNB may follow the traditional handover (HO) procedure defined in NR Release 15. After link establishment is complete, the link may be used for data and / or control signal transmission. The remote UE may monitor the physical downlink control channel (PDCCH) / physical downlink shared channel (PDSCH) on the direct link or the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSCCH) on the SL to receive transmissions.

[0064] Figure 6FIG6 is a signal flow diagram illustrating an example of establishing the SL segment of a relay link between a remote UE and a relay UE. In this example, gNB 610 has configured remote UE 614 to measure the link quality of various links at 620, including, in some embodiments, the SL segments of direct and indirect links. A measurement report may be sent to gNB 610 at 622 over the current link that remote UE 614 is using to communicate with the gNB. gNB 610 may decide whether to establish a new link. In this example, if a decision is made to establish a new link (i.e., a relay link) through relay UE 612, gNB 610 may send a request or other signaling (as shown at 632) to remote UE 614 to establish the sidelink segment between the remote UE and relay UE 612 over the SL at 624. Following this, gNB 610 may send RRC configuration / reconfiguration signaling or other signaling to remote UE 614 via relay UE 612, or directly to remote UE 614, at 626. If the remote UE 614 successfully receives the signaling, it can provide an indication of RRC configuration or reconfiguration completion to the gNB 610. This type of indication can be or include, for example, in the example shown, an RRC configuration Complete / reconfiguration Complete signaling or other signaling from the relay UE 612 to the gNB 610 at 628. In some embodiments, the relay UE 612 can also establish an association with the remote UE 614. After all of these operations are completed, the relay link for the remote UE 614 is considered established and can be used for DL ​​and / or UL data transmission as shown at 630.

[0065] In some embodiments, one link may be considered, deemed, or established as a primary link (primary link / major link), and any other link used for path switching may be considered, deemed, or established as a secondary link. For example, a direct link or indirect link that is expected to be more reliable than other links may be established or designated as a primary link. The configuration of any link other than the primary link (secondary link) may be sent to the relay UE (if any) and the remote UE via the primary link.

[0066] consider Figure 2 In example 200, the gNB at 202 may establish one of the links between the gNB and the remote UE 224 as a primary link and the other links as secondary links. The link configuration may include an index for each link, such as link #1 for the primary link, link #2 for the secondary link, and an index for any other secondary links corresponding to the remote UE 224.

[0067] The primary link and any secondary links may have different roles. For example, the primary link may be established first, and then used to establish one or more secondary links. In some embodiments, the primary role and the secondary role may be switched or updated.

[0068] The link may be activated or enabled, for example, as part of configuration, or otherwise during link establishment, by separate signaling, or by sending data on the link after link establishment. Data may be sent on the link, scheduled or initiated by the gNB or other network device, by the remote UE, by the relay UE, or by the assisting remote UE. In some embodiments, the link may be disabled, deactivated, or released by reconfiguration, by ceasing data transmission on the link, or by signaling sent from one or more of the gNB or other network device, the relay UE, the assisting remote UE, and the remote UE.

[0069] Link switching for communication between a remote UE and a communication network can be initiated after multiple links are established, regardless of the specific process or method used to establish these links. These links can be established together or separately, and can be designated or considered as, or not designated or considered as, a primary link and one or more secondary links. Compared to traditional schemes, such as RRC reconfiguration and deconfiguration or traditional handover (HO) or release of one link before a new link is established, which involves delays associated with access / communication establishment and configuration of the new link before the handover is completed, establishing multiple links simultaneously is more conducive to achieving faster path switching. The concept of "access" is very important because it involves more delays and is one of the main reasons for more delays in traditional link handover. Compared to traditional handover in which handover is initiated before access / reconfiguration of the new link, the present disclosure covers embodiments in which link establishment (which may include such access / configuration) is completed before the handover occurs. In addition or alternatively, simultaneous multi-link establishment according to some embodiments of the present invention can enable data transmission on multiple links at the same time to potentially improve, for example, peak data rate and system throughput.

[0070] Switching between links or paths can be initiated by explicit or implicit signaling. Signaling can initiate or cause link or path switching by specifying or otherwise indicating the link or path to which communication is to be switched, and / or the link or path to be deactivated or released.

[0071] In one embodiment, semi-static signaling is used. Examples of such signaling include RRC signaling or MAC-CE signaling in one or more MAC-CE messages.

[0072] Additionally or alternatively, dynamic signaling may be used for link switching. Downlink control information (DCI), sidelink control information (SCI) for a relay link, one or more medium access control-control elements (MAC-CEs), header information, or some other type of indication carried by the data are all examples of information that may be used to signal switching between links. For example, an explicit indication may be provided in a field in the DCI / SCI or in a MAC-CE / header / indication carried by the data to indicate that a path switch is to be performed. The UE's monitoring of the link may support an implicit switching indication. For example, a remote UE may monitor multiple established links, and receiving a DCI, SCI, or data on a link provides an implicit indication of the link to which the UE is to switch. Considering the above Figure 2 2. In one embodiment, to switch from direct link #1 to relay link #2, a DCI may be sent from the gNB or other network device 202 to the relay UE 222, and the relay UE may receive the PDSCH on link #2 and relay the data to the remote UE 224. In this example, the relay UE 222 receives the DCI on relay link #2, providing an implicit handover indication to the relay UE, while the remote UE 224 receives the data on relay link #2, providing an implicit handover indication to the remote UE.

[0073] Semi-static signaling may be preferred for avoiding packet loss, but it may increase latency compared to dynamic signaling. Therefore, dynamic signaling may be preferred over semi-static signaling for reducing latency. In some embodiments, explicit signaling or explicit handover indication can be beneficial, for example, to enable the remote UE or relay UE to more quickly stop monitoring the source link from which the communication is to be handed over, thereby saving energy.

[0074] In some embodiments, different types of signaling can be used. For example, dynamic signaling can enable the actual handover to the new link (target link), while semi-static signaling can deactivate or release the old link (source link). In another example, dynamic signaling can be used for the direct link segment and semi-static signaling can be used for the sidelink segment, or vice versa. Additionally or alternatively, different types of indications can be used, such as explicit signaling on the direct link segment and implicit signaling on the sidelink segment, or vice versa.

[0075] Other features can be implemented with or without signaling. For example, a timer can be used to set a transition period after signaling triggers a link or path switch. The timer can be configured or specified.

[0076] These are illustrative examples of signaling design and other features associated with triggering fast handover to potentially enable lossless and 0ms fast handover for service continuity.

[0077] Turning now to actually implementing a fast link or path switch, let's first consider the actions or processes provided or supported by a network device (e.g., a gNB) during a switch. The network device, or potentially multiple network devices, can configure multiple links for the remote UE. Alternatively, the UE can establish links with the assistance of the network device. To enable fast switching between links, multiple links are established simultaneously so that the established links are in place for fast path switching. In some embodiments, any relay UE and the remote UE simultaneously monitor the established links for communication. Network device actions may include determining when to initiate or enable a link or path switch and sending any messages or signaling, or otherwise providing indications, to the relay UE, the remote UE, or both to trigger the switch.

[0078] The signaling may carry a message or otherwise provide a handover command or indication. In one embodiment, the gNB or other network device may send RRC or MAC-CE signaling to one or more relay UEs, remote UEs, or both to indicate a link or path handover, or to indicate deactivation or release of a link. Additionally or alternatively, the gNB or other network device may send data-carrying DCI / header / indication to one or more relay UEs, remote UEs, or both to indicate a link or path handover, or to indicate deactivation or release of a link.

[0079] The signaling may be sent over any of various links, including, for example, the following: a primary link; a current link (source link) from which the remote UE is to switch (e.g., during an inter-gNB link handover, an activation (of the target link), a path switch signal, or a handover (HO) command may be sent by the source gNB from which the remote UE is to switch); a new link (target link) to which the remote UE is to switch (e.g., during an inter-gNB link handover, a deactivation, a release (of the source link), a path switch signal, or a data scheduling signal may be sent by the target gNB to which the remote UE is to switch); or both the current link and the new link.

[0080] In some embodiments, the implicit handover indication may be provided by the gNB or other network equipment sending data on the new link (target link) to which the remote UE is to be handed over, ceasing data transmission on the old link (source link), or both.

[0081] These are examples of network device behaviors, processes, or features. In some embodiments, other behaviors, processes, or features may be provided.

[0082] For example, Figure 7FIG is a block diagram illustrating link switching behavior and fast link switching with a transition period in one embodiment. Figure 7 In this example, a path switch from link #1 to link #2 is completed, and a network device such as a gNB or TRP can send duplicate data on both the current or source link (e.g., link #1) and the new or target link (e.g., link #2) during a transition period surrounding the path switch instance. This can help provide a smooth transition between links and avoid data or traffic loss during the switch. During the transition period, the remote UE and any corresponding relay UEs involved in link #1 and link #2 can monitor both links and decode data as it is transmitted. The transition period can be determined by a timer that begins after the switch signal. In another embodiment, the switch is initiated or triggered via signaling, and further signaling is sent to deactivate or release the old link or path and end the transition period. Another possible option is to specify or otherwise indicate the length of the transition period in the switch signaling.

[0083] Additionally or alternatively, a transition period in which communications on multiple links remain active may enable path switching after the HARQ process is completed on the current link. In other words, according to one embodiment, no HARQ process spans different links, or in other words, the HARQ process does not span different links.

[0084] Regarding relay UE behavior or procedures during link or path switching, after configuring a relay link including the relay UE, the relay UE monitors the direct link segment of the relay link to determine whether signaling or data from the remote UE has been received. Any signaling or data destined for the remote UE may be relayed to the remote UE after processing by the relay UE, such as decoding and re-encoding.

[0085] If a source relay UE on a relay path currently active and used for communication between a remote UE and a network device receives a path switching configuration, a deactivation or release configuration, or other switching indication (e.g., DCI / header / indication) indicating that a link or path is switched from its link to another, the source relay UE may stop monitoring signaling or data associated with the remote UE in its direct link segment. This may be done after a transition period. In some embodiments, the switching indication may be sent by the relay UE to the remote UE.

[0086] A target relay UE participating in a relay path that is not currently activated for communication with a remote UE may receive a path switch configuration, an activation configuration, or other switching indication (e.g., DCI / header / indication) indicating that a link or path is switched to its link. The target relay UE may then begin monitoring data on its direct link segment destined for the remote UE, possibly decoding or otherwise processing the data, and relaying the data to the remote UE via a sidelink. In some embodiments, the switching indication may be sent by the relay UE to the remote UE.

[0087] The remote UE behavior or process during link or path switching may include monitoring multiple links (including one or more sidelink segments of the relay link and possibly one or more direct links) after the links are established to determine whether signaling or data from the remote UE of the network device or relay UE is received. If the remote UE receives a path switching configuration, deactivation or release configuration, or a path switching indication (e.g., DCI / SCI / header / indication) indicating that the path is switched from the current link to another, the remote UE may stop monitoring the current link. This may be done after a transition period. If the remote UE receives a path switching configuration, activation configuration, or other indication (e.g., DCI / SCI / header / indication) indicating that the path is switched to a different link, the remote UE may begin monitoring and decoding data received on the different link.

[0088] During the transition period, the remote UE can monitor multiple links. This can, for example, help smooth path switching and avoid traffic loss during the handover. Additionally or alternatively, the remote UE can maintain communication on the current link until the HARQ process is complete, so that the HARQ process does not span different links.

[0089] Certain actions or processes may be common to the relay UE and the remote UE. For example, the relay UE on the relay link from which the remote UE is switching may remain active to maintain communications on the link during a transition period and / or until the HARQ process is completed.

[0090] Figure 8 and 9A to 9F The procedures, timelines, signaling / data flows, and behaviors provided by the illustrative embodiments are summarized.

[0091] Figure 8 A flow chart illustrating a method according to an embodiment is included. Figure 8 There are three flow charts in the embodiment of the present invention, including each of an exemplary network device process at 800, an exemplary relay UE process at 820, and an exemplary remote UE process at 840. These examples are for illustrative purposes only, and the embodiments are not limited in any way to these specific examples. Other embodiments may include more, fewer, or additional operations performed in a similar or different order than the order shown.

[0092] Referring first to the example of a network device at 800, in the illustrated embodiment, the network device is a gNB, which configures or otherwise establishes a first link at 802 and transmits data on that link. At 804, the gNB, or another gNB, such as in the case of an inter-gNB link handover, configures or otherwise establishes one or more second links for the same remote UE. At this point, a link handover has not yet been initiated, but multiple links have already been established.

[0093] The gNB, another device, or other apparatus may determine whether to perform a path switch for the remote UE, and an example of a gNB determining to perform a path switch for the remote UE is shown at 806. This determination may be made by the source gNB on the source link or the target gNB on the target link (if different from the source gNB). In other embodiments, the handover determination is made elsewhere, such as by a relay UE or a remote UE.

[0094] The gNB, such as the gNB that made the handover determination at 806, sends a path switch message to the relay UE and / or the remote UE (possibly via the relay UE) at 808. This message is an example of signaling that may be sent to initiate a handover.

[0095] In some embodiments, data may be replicated and sent by one or more gNBs over both links during a transition period, as shown at 810. After the handover is complete, which may be after the transition period, data is sent only over the target link, which is the second link in the example shown at 812.

[0096] Turning to the exemplary relay UE process at 820, for illustrative purposes, it is assumed that at least the first link is a relay link, and at 822, a first relay UE is configured in the first link to receive and relay data for a remote UE. One or more other links may also be relay links, in which case, at 824, relay UEs are also configured for the one or more other links. In some embodiments, at 826, each relay UE monitors and relays data for a remote UE on its corresponding link. For example, in the case of a multi-hop relay link involving multiple relay UEs but at least one common relay UE that is part of more than one link, the same relay UE may be part of multiple relay links.

[0097] At 828, one or more relay UEs receive a path switch message, which, as described above, is an example of signaling that may be sent to initiate a handover. A source relay UE on the source link, a target relay UE on the target link, or both may receive the handover message.

[0098] In some embodiments, data may be replicated and the replicated data sent on the source link and the target link during a transition period, and during this period, one or more relay UEs may monitor and decode data on their respective links, as shown at 830. At 832, after the handover is complete, and possibly after the transition period, the source relay UE may stop monitoring its link for data for the remote UE, and / or the target relay UE may begin or continue monitoring its link for remote UE data, decode the data, and relay the data to the remote UE via the target link, which is the second link in the illustrated example.

[0099] An exemplary remote UE process is shown at 840. At 842, a first link for the remote UE is configured or otherwise established, and the remote UE monitors and receives data on the link. One or more other links are also configured or otherwise established for the remote UE, and this is shown as an example at 844 where the remote UE receives configuration of one or more second links. In some embodiments, the remote UE monitors the multiple links at 846 to acquire data.

[0100] At 848, the remote UE receives signaling initiating the handover in the form of a path switch message in the illustrated example. In some embodiments, data may be replicated and the replicated data or replicated data may be sent on the source link and the target link during a transition period, during which the remote UE may monitor and decode data on both links, as shown at 850. At 852, after the handover is complete, and possibly after the transition period, the remote UE may stop monitoring the source link (in this example, the first link) and / or begin or continue monitoring the target link (in this example, the second link) for data.

[0101] Figure 9A An example timeline and signal / data flow for an intra-gNB link handover from a source relay link to a target relay link is shown. This example involves a network device 860 (e.g., a gNB or TRP), two relay UEs (including a source relay UE 862 on the source link and a target relay UE 864 on the target link), and a remote UE 866. The source link establishment involves signaling between the network device 860 and the source relay UE 862, and signaling between the source relay UE 862 and the remote UE 866. After the source link has been established, data can be sent between the network device 860 and the remote UE 866 via the source relay UE 862.

[0102] Figure 9ABefore any handover is initiated, a target link is established using signaling between the network device 860 and the target relay UE 864, and signaling between the target relay UE 864 and the remote UE 866. The remote UE 866 may monitor both the source link and the target link after the target link is established, whether both the source link and the target link are used for data transmission, or whether only the source link is used for data transmission.

[0103] In the illustrated example, handover signaling for initiating a handover is sent via the relay UE to relay UEs 862 and 864 and remote UE 866. During a transition period, duplicate data is sent via relay UEs 862 and 864 on both the source link and the target link between network device 860 and remote UE 866. Remote UE 866 monitors data on both links during the transition period. At the end of the transition period, remote UE 866 monitors only the target link, and data transmission between network device 860 and the remote UE occurs only on the target link via target relay UE 864.

[0104] Figure 9A The diagrams represent illustrative examples and variations are possible. For example, signaling and / or data transmission may involve downlink transmission, uplink transmission, or both, as shown. It should also be noted that data transmission on the source link may occur before the target link is established (as shown) and / or after the target link is established. Figure 9A Not shown, but in some embodiments, both the source link and the target link are used for data transmission after link configuration or establishment and before link switching.

[0105] In other embodiments, the handover signaling is sent on the source link, e.g., via source relay UE 862 to source relay UE 862 and remote UE 866, or on the target link, e.g., via target relay UE 864 to target relay UE 864 and remote UE 866, but not both together.

[0106] In the example shown, relay UEs 862, 864 communicate with network device 860 and remote UE 866, but relay UEs may be able to communicate with each other via, for example, a sidelink. In some embodiments, data and / or signaling may be exchanged directly between relay UEs 862, 864.

[0107] Not all embodiments require a transition period for supporting replication of transmissions on multiple links, or the transition period may be left as an implementation issue not specified in the communication system requirements. For example, the path switch signal may serve as both a switch signal and a source link deactivation signal to implement link switching from a source link to a target link and deactivation of the source link (possibly after a transition period).

[0108] These and / or other changes may apply not only to Figure 9A The examples in FIG. 3 and may additionally or alternatively apply to other examples or other embodiments.

[0109] Figure 9B An example timeline and signal / data flow for an intra-gNB link handover from a source direct link to a target relay link is shown. This example involves a network device 860, such as a gNB or TRP, a target relay UE 864 on the target link, and a remote UE 866. The source link establishment of the direct link involves signaling between the network device 860 and the remote UE 866. After the source link has been established, data can be sent between the network device 860 and the remote UE 866 over the direct link.

[0110] Figure 9B Before any handover is initiated, a target relay link is established using signaling between the network device 860 and the target relay UE 864, and signaling between the target relay UE and the remote UE 866. The remote UE 866 may monitor both the source link and the target link after the target link is established, whether both the source link and the target link are used for data transmission, or whether only the source link is used for data transmission.

[0111] In the illustrated example, handover signaling for initiating a handover is sent to remote UE 866 via both the source direct link and the target relay link. During a transition period, duplicate data is sent on both the source link and the target link. Remote UE 866 monitors data on both links during the transition period, and at the end of the transition period, remote UE 866 monitors only the target link. After the transition period, data transmission between network device 860 and remote UE 866 occurs solely on the target link via target relay UE 864.

[0112] Figure 9C An exemplary timeline and signal / data flow for an intra-gNB link handover from a source relay link to a target direct link is shown. Figure 9C The exemplary timeline and signal / data flow in Figure 9A and Figure 9B The exemplary timeline and signal / data flow in FIG are similar, but involve switching from a source relay link to a target direct link. The source link establishment involves signaling between network device 860 and source relay UE 862, as well as signaling between the source relay UE and remote UE 866. After the source link has been established, data can be sent between network device 860 and remote UE 866 via source relay UE 862. Figure 9CIn the example, before any handover is initiated, a target direct link is established using signaling between the network device 860 and the remote UE 866. As with the other examples, the remote UE 866 can monitor both the source link and the target link after the target link is established, whether both the source link and the target link are used for data transmission or only the source link is used for data transmission.

[0113] Path switching signal in Figure 9C , as with other examples, as a form of handover signaling for initiating a handover between links. In the example shown, this signaling is sent by source relay UE 862 to remote UE 866 via the source relay link and via the direct link. During a transition period, duplicate data is sent on both the source link and the target link, with remote UE 866 monitoring data on both links. Remote UE 866 monitors only the target link, and after the transition period, data transmission between network device 860 and the remote UE occurs only on the target link.

[0114] exist Figure 9D An exemplary timeline and signal / data flow for an inter-gNB link handover from a source relay link to a target relay link is shown in FIG. This example is similar to Figure 9A The example shown in , but involving two network devices. The network devices are shown as target gNB 861 and source gNB 863. The UE behavior of relay UEs 862, 864 and remote UE 866 is as in reference Figure 9A As described, the network device behavior is also similar to the reference Figure 9A described, except that, in Figure 9D In the example, network equipment operations are divided between the target gNB 861 and the source gNB 863.

[0115] Figure 9E The exemplary timeline and signal / data flows in FIG. 1 correspond to an inter-gNB link handover from a source direct link to a target relay link and are similar to Figure 9B The example in is similar to the one in Figure 9E , network equipment operations are divided between target gNB 861 and source gNB 863. Similarly, Figure 9F The exemplary timeline and signal / data flows in FIG. 1 correspond to an inter-gNB link handover from a source relay link to a target direct link, similar to FIG. Figure 9C Examples in .

[0116] As with the other examples, Figures 9D to 9F In , both the target link and the source link are established before any handover is initiated to achieve fast handover between links, and Figures 9D to 9F In the example of inter-gNB link handover, the link is switched between network devices.

[0117] For inter-gNB link handover ( Figures 9D to 9F ), the path switch signal may be or be included in a handover (HO) command, as shown. The HO command may be sent only by the source gNB 863 on the source link and may be used for link switching from the source link to the target link and deactivation of the source link (possibly after a transition period).

[0118] Figure 8 and 9A to 9F The examples in are illustrative of various embodiments. These embodiments include, for example, a method related to remote UE behavior. Such a method may involve receiving signaling, such as Figure 8 and 9A to 9F The path switch message or path switch signal shown includes an explicit indication that the UE will switch between multiple communication links, wherein the multiple communication links have been established for communication with the wireless communication network before the signaling is received. The multiple communication links established include a first communication link and a second communication link. In one embodiment, the first communication link includes a relay link between the UE and the wireless communication network. The second communication link can be a direct communication link or another relay link. Examples of at least one relay link and at least one direct link, or multiple relay links without necessarily any direct links, are provided herein.

[0119] The method may also involve the UE switching between the first communication link and the second communication link in response to the explicit indication to communicate with the wireless communication network.

[0120] In some embodiments, for example, Figure 9B 、 Figure 9C 、 Figure 9E and Figure 9F In the example of , receiving signaling involves receiving signaling from a network device in direct communication with the UE. Additionally or alternatively, the remote UE may receive signaling from a participating relay link, or in the case of multiple relay links (e.g., Figure 9A and Figure 9D In the example in FIG, another UE (relay UE) participating in each relay link receives signaling. Generally, receiving signaling may involve receiving signaling via any one or more of the first communication link, the second communication link, and another communication link between the UE and the wireless communication network.

[0121] The signaling received by the UE may include one or both of semi-static signaling and dynamic signaling, examples of which are provided elsewhere herein. For example, such signaling may be or include any one or more of: RRC signaling, MAC-CE signaling, DCI, SCI, header information, or explicit indication carried by data.

[0122] The communication handoff between different links can take any of a variety of forms. For example, considering a first communication link and a second communication link, the handoff can be from one of the first communication link and the second communication link (also referred to herein as the source link) to the other communication link (also referred to herein as the target link). The explicit indication can be or include an explicit indication for handoff from one of the first communication link and the second communication link to the other of the first communication link and the second communication link.

[0123] Another example of an explicit indication is an explicit indication for deactivating one of the first communication link and the second communication link from which the communication is to be switched.

[0124] The signaling may include multiple instructions. For example, the signaling may include an explicit instruction for switching from one of the first communication link and the second communication link to the other of the first communication link and the second communication link, and the signaling may also include an explicit instruction for deactivating one of the first communication link and the second communication link that will not be used for communication after the switching is completed.

[0125] In some embodiments, the explicit indication in the received signaling is or includes an explicit indication for switching from one of the first communication link and the second communication link to the other of the first communication link and the second communication link, and the method further involves: the UE receiving another signaling, the other signaling including another explicit indication that the UE will deactivate one of the first communication link and the second communication link; and the UE deactivating the one of the first communication link and the second communication link in response to the another explicit indication. Separate signaling (such as in this example) can facilitate initiating and ending the transition period.

[0126] The process of link switching or path switching may take any of a variety of forms. The transition period represents an example where the switching involves maintaining communications with the wireless communication network via the first communication link and the second communication link during the transition period. Even though the switching of communications from one of the first communication link and the second communication link to the other communication link may be in response to, for example, received signaling, the switching may involve the remote UE monitoring both the first communication link and the second communication link during the transition period and then monitoring only the other of the first communication link and the second communication link after the transition period. This is in Figure 8 and 9A to 9F As also shown in the examples of these figures, before receiving the signaling, the remote UE may monitor the first communication link and the second communication link after they are established.

[0127] In other words, in the context of switching from one of a first communication link to the other communication link, the method may involve the remote UE starting to monitor the other of the first communication link and the second communication link in response to an explicit indication in received signaling. Additionally or alternatively, some embodiments may involve the remote UE ceasing to monitor one of the first communication link and the second communication link in response to the explicit indication, or possibly after a transition period.

[0128] The transition time period can be consistent with any one or more of the following: an indication of a transition time period provided in the received signaling; a time delay between receiving the signaling and receiving another signaling associated with deactivation of the first communication link or the second communication link; a predetermined time period; a time period between receiving the signaling and expiration of a timer; completion of a retransmission process initiated before receiving the signaling.

[0129] Additionally or alternatively, other features may be implemented, provided, or supported by the remote UE.

[0130] Embodiments also encompass relay UE features and behaviors. A method performed by a relay UE participating in a relay link between a wireless communication network and a second UE may include, for example, relay UE communication signaling, the signaling being or including an explicit indication that the second UE will switch between the relay link and the second communication link to communicate with the wireless communication network. The relay link (which in this example may be considered a first communication link) and the second communication link are multiple communication links established for communication between the wireless communication network and the second UE prior to the relay UE communication signaling. The second communication link may be another relay link or a direct link.

[0131] The method may further involve the relay UE operating in a manner consistent with the handover of the second UE between the first communication link and the second communication link. The manner in which the relay UE operates after the handover depends on whether the relay UE is a source relay UE on the source link or a target relay UE on the target link, or in other words, whether the communication is handed over to the relay link or left the relay link.

[0132] Relaying UE communication signaling may involve the relay UE receiving signaling from a network device with which the second UE communicates via a relay link. For example, in the example shown, 9A to 9F The relay UE in the embodiment receives a path switching signal from one or more network devices. Operating the relay UE in these embodiments may involve modifying the operation of the relay UE in response to an explicit indication provided by the received signaling.

[0133] Some embodiments may involve different types of signaling or indications between different elements or components. For example, a relay UE that receives signaling with an explicit indication from a network device may provide an implicit or explicit indication to a second UE in response to the explicit indication that the second UE will switch between a first communication link and a second communication link to communicate with the wireless communication network. In this example, the relay UE receives the explicit indication, but may provide different indications to the second UE, including implicit or explicit indications.

[0134] In other embodiments, the relay UE receives the signaling and sends the same type of signaling or indication, or even the same signaling or indication, to the remote UE.

[0135] Relaying UE communication signaling may involve the relay UE sending signaling to the second UE, such as 9A to 9F As shown by way of example, the relay UE sends a path switching signal to the remote UE. The relay UE may send signaling to the remote UE by directly sending signaling to the remote UE or, for example, sending signaling to another relay UE participating in a multi-hop relay link.

[0136] Signaling can be sent by the relay UE in response to any of a variety of conditions or parameters. For example, the relay UE may determine that a link switch is to be performed and, in response to the determination, send signaling to the remote UE. In another embodiment, the relay UE receives an implicit indication or another explicit indication that the second UE is to switch between the first communication link and the second communication link to communicate with the wireless communication network. The communication may then involve communicating the signaling by sending signaling with an explicit indication to the second UE, and the operation may involve modifying the operation of the first UE in response to the implicit indication or another explicit indication received by the relay UE.

[0137] The relay UE may communicate any of various types of signaling, including any one or more of the following: semi-static signaling, dynamic signaling, RRC signaling, MAC-CE signaling, DCI, SCI, header information, or explicit indication carried by data.

[0138] The explicit indication communicated by the relay UE can similarly take any of a variety of forms. For example, the explicit indication can be or include an explicit indication associated with a switch from a first communication link to a second communication link. The indication associated with such a switch can include, for example, a deactivation or release indication, since in this example, communications are being switched away from the first communication link. In the event of such a switch, operating the relay UE may involve ceasing to monitor communications traffic associated with the second UE on the first communication link.

[0139] In another embodiment, the explicit indication may be or include an explicit indication associated with switching from the second communication link to the first communication link, in which case operating the relay UE may involve commencing monitoring communication traffic on the first communication link associated with the second UE.

[0140] The relay UE behavior or characteristics may support a transition period. For example, operating the relay UE in a manner consistent with the explicit indication may involve monitoring communication traffic associated with the second UE in the first communication link during a transition period in which the communication traffic is also communicated over the second communication link. The communication traffic may be replicated on the two links, or different communication traffic may be communicated on the first link and the second link. As an example of different communication traffic on the links, the transition period may support completion of a HARQ process on the current link, and in this scenario, one or more HARQ retransmissions may be performed on the source link, and new communication traffic may be communicated on the target link.

[0141] The transition time period can be consistent with any one or more of the following, for example: an indication of the transition time period provided in the signaling, a time delay between the communication of the signaling and the receipt of another signaling associated with the deactivation of the first communication link; a predetermined time period; a time period between the communication of the signaling and the expiration of a timer; and the completion of a retransmission process initiated prior to the communication signaling.

[0142] Additionally or alternatively, other features may be implemented, provided, or supported by the relay UE.

[0143] The embodiments disclosed herein also encompass link switching control. For example, another aspect of the present disclosure provides a method involving determining whether a link switching condition is met and sending signaling to cause a link switching.

[0144] The link switching condition is a condition for the UE to switch between multiple communication links established for communication with the wireless communication network before the determination is made. The multiple communication links include at least a first communication link and a second communication link, with at least the first communication link being a relay link between the UE and the wireless communication network. As in other embodiments, the second link can be a direct link or another relay link.

[0145] In response to determining that the link switching condition is met, signaling is sent to cause the UE to switch between the first communication link and the second communication link to communicate with the wireless communication network. In some embodiments, the signaling is or includes an explicit indication that the UE will switch between the first communication link and the second communication link to communicate with the wireless communication network.

[0146] This approach can be performed or supported by network equipment such as a gNB, or by other components such as a relay UE. For example, the network equipment can determine when a handover occurs based on measurements or feedback received from a remote UE.

[0147] In some embodiments, the determination involves another UE participating in the relay link determining that the UE will switch between the first communication link and the second communication link to communicate with the wireless communication network. The relay UE may receive measurements or feedback from the remote UE and make the handover determination. In another embodiment, the relay UE receiving handover or deactivation signaling from the network device may perform one type of determination based on receiving the signaling and then send another type of signaling to the remote UE. More generally, the determination may be based on signaling received by the relay UE, which may be or include an implicit indication that the UE will switch between links or another explicit indication.

[0148] In some embodiments, the link switching is transparent to the relay UEs participating in the relay link.

[0149] Therefore, the relay UE may or may not participate in the link switching control.

[0150] As disclosed herein, multiple links are established before initiating a handover. In some embodiments, the method further involves establishing a first communication link and a second communication link before determining. This may involve one or more relay UEs. In some embodiments, the link establishment is under the control of a network device, such as, for example, 9A to 9F In the example shown in .

[0151] Signaling for switching the UE between links may be sent via any one or more of the first communication link, the second communication link, and another communication link between the UE and the wireless communication network. Examples of such signaling include the following, any one or more of which may be implemented or supported: semi-static signaling, dynamic signaling, RRC signaling, MAC-CE signaling, DCI, SCI, header information, or explicit indication carried by data.

[0152] The explicit indication in the signaling sent after determining that the link switching condition is satisfied may take any of various forms. For example, the explicit indication may be or include an explicit indication for switching from one of the first communication link and the second communication link (also referred to herein as the source link) to the other of the first communication link and the second communication link (also referred to herein as the target link).

[0153] In one embodiment, the signaling is used to switch the UE from one of the first communication link and the second communication link to the other communication link, and the explicit indication is or includes an explicit indication for deactivating one of the first communication link and the second communication link.

[0154] According to another embodiment, the explicit instruction is or includes an explicit instruction for switching from one of the first communication link and the second communication link to the other communication link, and the signaling further includes an explicit instruction for deactivating one of the first communication link and the second communication link.

[0155] In another scenario, the explicit indication is or includes an explicit indication for switching from one of the first communication link and the second communication link to the other communication link, and the method further involves sending another signaling, which is or includes another explicit indication that the UE will deactivate one of the first communication link and the second communication link.

[0156] Additionally or alternatively, other features may be implemented, provided, or supported in these methods.

[0157] For example, the method may involve maintaining communication between the UE and the wireless communication network via the first communication link and the second communication link during a transition period. Consider an embodiment in which the explicit indication is or includes an explicit indication for switching from one of the first communication link and the second communication link to the other communication link. The method may involve the following operations: copying the UE's data on the first communication link and the second communication link during the transition period, or sending different data on the first communication link and the second communication link during the transition period. Such a transition period may be consistent with any one or more of the following: an indication of the transition period provided in the signaling; a time delay between sending the signaling and sending another signaling associated with deactivation of the first communication link or the second communication link; a predetermined time period; a time period between sending the signaling and expiration of a timer; completion of a retransmission process initiated before sending.

[0158] The above embodiments are primarily described in the context of exemplary methods. Other embodiments are possible.

[0159] For example, see Figure 10A and Figure 10B , shows an exemplary device that can implement the methods and teachings provided by the present disclosure.

[0160] Figure 10A An exemplary ED 910 is shown, Figure 10B An exemplary base station 970 is shown. These components may be used in the system 100 ( Figure 1 ) or any other suitable system.

[0161] like Figure 10A As shown, ED 910 includes at least one processing unit 900. Processing unit 900 implements various processing operations of ED 910. For example, processing unit 900 may perform signal encoding, data processing, power control, input processing, output processing, or any other function that enables ED 910 to operate in a communication system. Processing unit 900 may also be used to implement some or all of the functions or embodiments detailed herein. Each processing unit 900 includes any suitable processing or computing device for performing one or more operations. Each processing unit 900 may include a microprocessor, a microcontroller, a digital signal processor, a field programmable gate array, an application-specific integrated circuit, or the like.

[0162] ED 910 also includes at least one transceiver 902. Transceiver 902 is used to modulate data or other content for transmission via at least one antenna or network interface controller (NIC) 904. Transceiver 902 is also used to demodulate data or other content received by at least one antenna 904. Each transceiver 902 includes any suitable structure for generating signals for wireless transmission and / or for processing wireless or wired received signals. Each antenna 904 includes any suitable structure for transmitting and / or receiving wireless signals. One or more transceivers 902 can be used in ED 910, and one or more antennas 904 can be used in ED 910. Although transceiver 902 is shown as a single functional unit, it can be implemented using at least one transmitter and at least one separate receiver.

[0163] ED 910 also includes one or more input / output devices 906 or interfaces. Input / output devices 906 facilitate interaction with users or other devices in the network (network communications). Each input / output device 906 includes any suitable structure for providing information to a user or receiving / providing information from a user, such as a speaker, microphone, keypad, keyboard, display, or touch screen, including network interface communications.

[0164] In addition, the ED 910 includes at least one memory 908. The memory 908 stores instructions and data used, generated, or collected by the ED 910. For example, the memory 908 may store software instructions or modules for implementing some or all of the functions or embodiments described above and executed by one or more processing units 900. Each memory 908 includes any suitable one or more volatile and / or non-volatile storage and retrieval devices. Any suitable type of memory may be used, such as random access memory (RAM), read-only memory (ROM), a hard disk, an optical disk, a subscriber identity module (SIM) card, a memory stick, a secure digital (SD) memory card, etc.

[0165] like Figure 10B As shown, base station 970 includes at least one processing unit 950, at least one transmitter 952, at least one receiver 954, one or more antennas 956, at least one memory 958, and one or more input / output devices or interfaces 966. Transceivers (not shown) may be used in place of transmitter 952 and receiver 954. Scheduler 953 may be coupled to processing unit 950. Scheduler 953 may be included within base station 970 or may operate separately from base station 970. Processing unit 950 implements various processing operations for base station 970, such as signal encoding, data processing, power control, input processing, output processing, or any other functions. Processing unit 950 may also be used to implement some or all of the functions or embodiments detailed herein. Each processing unit 950 includes any suitable processing or computing device for performing one or more operations. Each processing unit 950 may include a microprocessor, a microcontroller, a digital signal processor, a field programmable gate array, an application-specific integrated circuit, or the like.

[0166] Each transmitter 952 includes any suitable structure for generating signals for wireless transmission to one or more EDs or other devices. Each receiver 954 includes any suitable structure for processing signals received wirelessly or by wire from one or more EDs or other devices. Although shown as separate components, at least one transmitter 952 and at least one receiver 954 may be combined into a transceiver. Each antenna 956 includes any suitable structure for transmitting, receiving, or both transmitting and receiving wireless signals. Although a shared antenna 956 is shown coupled to both transmitter 952 and receiver 954, one or more antennas 956 may be coupled to transmitter 952, while one or more separate antennas 956 may be coupled to receiver 954. Each memory 958 includes any suitable one or more volatile and / or non-volatile storage and retrieval devices, such as those described above in connection with ED 910. Memory 958 stores instructions and data used, generated, or collected by base station 970. For example, memory 958 may store software instructions or modules for implementing some or all of the functionality or embodiments described herein, which are executed by one or more processing units 950.

[0167] Each input / output device 966 facilitates interaction with users or other devices in a network (network communications). Each input / output device 966 includes any suitable structure for providing information to a user or receiving / providing information from a user, including network interface communications.

[0168] It should be understood that one or more steps of the embodiment method provided herein can be performed by corresponding units or modules. For example, a signal can be sent by a sending unit or a sending module. A signal can be received by a receiving unit or a receiving module. A signal can be processed by a processing unit or a processing module. Other steps can be performed by these or other modules. The corresponding units or modules can be implemented using hardware, components of execution software, or a combination thereof. For example, one or more units or modules can be or include one or more integrated circuits, such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). It should be understood that if these modules are implemented using software, these modules can be retrieved in whole or in part by a processor as needed, retrieved individually or collectively for processing, retrieved in one or more instances, and these modules themselves can include instructions for further deployment and instantiation.

[0169] Generally, components of hardware, firmware, executing software, or some combination thereof may be used to implement the features disclosed herein. Electronic devices that may be suitable for implementing any or all of these components include microprocessors, microcontrollers, programmable logic devices (PLDs), field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), and other types of "intelligent" integrated circuits, among others.

[0170] Any of a variety of storage devices may be implemented. For example, one or both of memory 908 and memory 958 may include one or more physical storage devices. Solid-state storage devices such as flash memory devices may be implemented. Additionally or alternatively, storage devices having removable or even removable storage media may be implemented.

[0171] Figure 10A and Figure 10B 1 and 2 show examples of UEs and network devices, respectively, in which embodiments may be implemented. More generally, an apparatus may include a processor and a non-transitory computer-readable storage medium, such as Figure 10A or Figure 10B The processing units 900, 950 and memories 908, 958 in the apparatus may be a UE, including a relay UE, a source UE, a destination UE, an assisting remote UE, or a remote UE. Another example of an apparatus is a network device, which may be a gNB, a TRP, a base station, or any other type of network device mentioned herein. Other components may also be provided, such as a communication interface coupled to the processor. Figure 10A and Figure 10B Elements 902, 904, 952, 954, 956 in are examples of communication interfaces that may be provided in some embodiments.

[0172] In one embodiment, the storage medium stores a program executed by a processor, and the program includes instructions for executing the method disclosed herein. For example, when the instructions are executed by the processor, the processor may perform any of a variety of operations.

[0173] Another embodiment relates to a computer program product comprising a non-transitory computer-readable storage medium storing a program including instructions for executing the method disclosed herein.

[0174] In some embodiments, the apparatus is a UE, and the program includes instructions to cause a processor in the UE to receive signaling including an instruction indicating that the UE is to switch between multiple communication links established for communicating with a wireless communication network prior to receiving the signaling, and to switch between the communication links used for communicating with the wireless communication network in response to the explicit instruction. The multiple communication links include a first communication link and a second communication link, and at least the first communication link is or includes a relay link between the UE and the wireless communication network.

[0175] Some embodiments include any one or more of the following features, in any of various combinations:

[0176] The instructions cause the processor to receive signaling from a network device with which the UE is in direct communication via a second communication link;

[0177] The instructions cause the processor to receive signaling from another UE participating in the relay link;

[0178] The instructions cause the processor to receive signaling via any one or more of the first communication link, the second communication link, and another communication link between the UE and the wireless communication network;

[0179] The second communication link is or includes another relay link between the UE and the wireless communication network;

[0180] The signaling is or includes one or both of semi-static signaling and dynamic signaling;

[0181] Signaling is or includes any one or more of the following: RRC signaling, MAC-CE signaling, DCI, SCI, header information or explicit indication carried by data;

[0182] The instructions cause the processor to switch from one of the first communication link and the second communication link to the other of the first communication link and the second communication link to communicate with the wireless communication network;

[0183] The explicit indication is or includes an explicit indication for switching from one of the first communication link and the second communication link to the other of the first communication link and the second communication link;

[0184] The explicit instruction is or includes an explicit instruction for deactivating one of the first communication link and the second communication link;

[0185] The signaling further includes an explicit indication for deactivating one of the first communication link and the second communication link;

[0186] The instructions cause the processor to receive another signaling including another explicit indication that the UE is to deactivate one of the first communication link and the second communication link;

[0187] The instructions cause the processor to deactivate one of the first communication link and the second communication link in response to another explicit indication;

[0188] instructions causing the processor to maintain communication with the wireless communication network via the first communication link and the second communication link during a transition period;

[0189] The instructions cause the processor to begin monitoring the other of the first communication link and the second communication link in response to an explicit indication;

[0190] Instructions cause the processor to cease monitoring one of the first communication link and the second communication link in response to an explicit indication or after a transition period of time;

[0191] The transition time period is consistent with any one or more of: an indication of a transition time period provided in the received signaling; a time delay between receiving the signaling and receiving another signaling associated with deactivation of the first communication link or the second communication link; a predetermined time period; a time period between receiving the signaling and expiration of a timer; completion of a retransmission procedure initiated prior to receiving the signaling;

[0192] The instructions cause the processor to monitor the first communication link and the second communication link after the first communication link and the second communication link are established, prior to receiving the signaling.

[0193] In another apparatus embodiment, the apparatus is a first UE participating in a relay link, the relay link comprising a first communication link between a wireless communication network and a second UE, and the program comprises instructions causing a processor in the first UE to perform the following operations: communication signaling, the signaling being or comprising an explicit indication that the second UE will switch between the first communication link and the second communication link to communicate with the wireless communication network; and operating in a manner consistent with the second UE switching between the first communication link and the second communication link. The first communication link and the second communication link are multiple communication links established for communication between the wireless communication network and the second UE prior to the communication signaling.

[0194] Some embodiments include any one or more of the following features, in any of various combinations:

[0195] The instructions cause the processor to communicate signaling by receiving signaling from a network device with which the second UE communicates via the first communication link;

[0196] The instructions cause the processor to: modify the operation of the first UE in response to the explicit indication;

[0197] The program further includes instructions to cause the processor to provide, in response to the explicit indication, an implicit indication or an explicit indication to the second UE that the second UE is to switch between the first communication link and the second communication link to communicate with the wireless communication network;

[0198] The instructions cause the processor to communicate the signaling by sending signaling to the second UE;

[0199] The program further includes instructions to cause the processor to receive an implicit indication or another explicit indication that the second UE is to switch between the first communication link and the second communication link to communicate with the wireless communication network;

[0200] The instructions cause the processor to: modify the first UE in response to an implicit indication or another explicit indication received by the first UE;

[0201] The signaling is or includes one or both of semi-static signaling and dynamic signaling;

[0202] Signaling is or includes any one or more of the following: RRC signaling, MAC-CE signaling, DCI, SCI, header information or explicit indication carried by data;

[0203] The explicit indication is or includes an explicit indication associated with switching from the first communication link to the second communication link;

[0204] The instructions cause the processor to: cease monitoring communication traffic on a first communication link associated with a second UE;

[0205] The explicit indication includes an explicit indication associated with switching from the second communication link to the first communication link;

[0206] The instructions cause the processor to: begin monitoring communication traffic on a first communication link associated with a second UE;

[0207] The instructions cause the processor to: monitor the first communication link for communication traffic associated with the second UE during a transition period in which communication traffic is communicated via the second communication link;

[0208] The transition time period is consistent with any one or more of: an indication of a transition time period provided in the signaling, a time delay between communication of the signaling and receipt of another signaling associated with deactivation of the first communication link; a predetermined time period; a time period between communication of the signaling and expiration of a timer; and completion of a retransmission procedure initiated prior to the communication signaling.

[0209] In another apparatus embodiment, a program includes instructions for causing a processor to determine whether a link switching condition is satisfied, the link switching condition including a condition for a UE to switch between multiple communication links, the multiple communication links being established for communication with a wireless communication network prior to the determination. The multiple communication links include a first communication link and a second communication link, at least the first communication link being or including a relay link between the UE and the wireless communication network. The program also includes instructions for causing the processor to send signaling after determining that the link switching condition is satisfied, causing the UE to switch between the first communication link and the second communication link to communicate with the wireless communication network. The signaling is or includes an explicit indication that the UE will switch between the first communication link and the second communication link to communicate with the wireless communication network.

[0210] Some embodiments include any one or more of the following features, in any of various combinations:

[0211] The apparatus includes another UE participating in a relay link;

[0212] The instructions cause the processor to determine whether a link switching condition is satisfied based on an implicit indication or another explicit indication received from another UE;

[0213] The instructions cause the processor to establish the first communication link and the second communication link before determining whether a link switching condition is satisfied;

[0214] The instructions cause the processor to send signaling via any one or more of the first communication link, the second communication link, and another communication link between the UE and the wireless communication network;

[0215] The signaling is or includes one or both of semi-static signaling and dynamic signaling;

[0216] Signaling is or includes any one or more of the following: RRC signaling, MAC-CE signaling, DCI, SCI, header information or explicit indication carried by data;

[0217] The explicit indication is or includes an explicit indication for switching from one of the first communication link and the second communication link to the other of the first communication link and the second communication link;

[0218] The signaling is used to enable the UE to switch from one communication link of the first communication link and the second communication link to the other communication link of the first communication link and the second communication link to communicate with the wireless communication network;

[0219] The explicit instruction is or includes an explicit instruction for deactivating one of the first communication link and the second communication link;

[0220] The signaling further includes an explicit indication for deactivating one of the first communication link and the second communication link;

[0221] The instructions cause the processor to send another signaling including another explicit indication that the UE is to deactivate one of the first communication link and the second communication link;

[0222] The instructions cause the processor to maintain communication between the UE and the wireless communication network via the first communication link and the second communication link during the transition period;

[0223] The transition time period is consistent with any one or more of: an indication of a transition time period provided in the signaling; a time delay between sending the signaling and sending another signaling associated with deactivation of the first communication link or the second communication link; a predetermined time period; a time period between sending the signaling and expiration of a timer; completion of a retransmission process initiated prior to sending.

[0224] Other features that may be implemented in the apparatus embodiments may be or become apparent from, for example, the method embodiments disclosed herein.

[0225] Figure 11 1 is a block diagram of an example telecommunications network 1000 provided in accordance with an embodiment. The telecommunications network 1000 includes a core network 1002 and an access network 1006. The access network 1006 serves a plurality of UEs 1004a, 1004b, 1004c, 1004d, 1004e, 1004f, 1004g, 1004h, and 1004i. In some embodiments, the access network 1006 is an evolved universal terrestrial access (E-UTRA) network. Another example of the access network 1006 is a cloud access network (C-RAN). The access network 1006 includes a plurality of base stations 1008a, 1008b, and 1008c. BSs 1008a through 1008c each provide a corresponding wireless coverage area 1010a, 1010b, and 1010c, also referred to as a cell. Each of BSs 1008a-1008c may be implemented using a wireless transceiver, one or more antennas, and associated processing circuitry (eg, antenna radio frequency (RF) circuitry, one or more analog-to-digital converters, one or more digital-to-analog converters, etc.).

[0226] Although not shown, BSs 1008a-1008c are each connected to core network 1002, either directly or through one or more central processing hubs (eg, servers). BSs 1008a-1008c may serve as gateways between the wired and wireless portions of access network 1006.

[0227] Depending on the implementation, each of the BSs 1008a to 1008c may also be referred to as a base transceiver station, a wireless BS, a network node, a transmission node, a transmission point, a Node B, an eNode B, or a remote radio head (RRH), etc.

[0228] In operation, a plurality of UEs 1004a to 1004i access the telecommunications network 1000 using the access network 1006 by wirelessly communicating with one or more of the BSs 1008a to 1008c.

[0229] UEs 1004a to 1004d are in close proximity to one another. Although UEs 1004a to 1004d can each communicate wirelessly with BS 1008a, they can also communicate directly with one another, as indicated by 1016. The communication indicated by 1016 is direct communication between UEs without going through an access network component (e.g., a BS), such as the sidelink communication disclosed herein. Figure 11 As shown, inter-UE communication 1016 occurs directly between UEs 1004a to 1004d and is not routed through BS 1008a or any other part of the access network 1006. Communication 1016 may also be referred to as side communication. In the embodiments disclosed herein, inter-UE communication uses a sidelink channel and a sidelink air interface. On the other hand, communication between an access network component (e.g., BS 1008a) and a UE (e.g., communication 1014) is referred to as access communication. Access communication occurs on an access channel, which may be an uplink or downlink channel, and uses a wireless access communication interface, such as a cellular wireless access air interface. The access and sidelink air interfaces may use different transmission formats, such as different waveforms, different multiple access schemes, or different wireless access technologies. Some examples of wireless access technologies that may be used for the access air interface or sidelink air interface are: long term evolution (LTE), LTE license assisted access (LTE-LAA), and WiFi.

[0230] By using sidelink communication 1016, UEs 1004a through 1004d can facilitate wireless communications between UEs 1004a through 1004d and BS 1008a. For example, if UE 1004c fails to correctly decode a data packet received from BS 1008a, but UE 1004d is able to receive and correctly decode a data packet from BS 1008a, UE 1004d can directly transmit the decoded data packet to UE 1004c via sidelink communication 1016. For another example, if UE 1004c moves out of wireless coverage area 1010c, such that UE 1004c can no longer wirelessly communicate with BS 1008a, UE 1004b can forward messages between UE 1004c and BS 1008a. For another example, both UE 1004a and UE 1004c can receive a signal transmitted from BS 1008a that carries a data packet intended for UE 1004c. UE 1004a may then transmit the signal received by UE 1004a to UE 1004c via sidelink communication 1016. UE 1004c may then use the information received from UE 1004a to assist in decoding the data packet from BS 1008a. In these examples, capacity and / or coverage may be enhanced through assistance from one or more of UEs 1004a, 1004b, and / or 1004d.

[0231] In some embodiments, UEs 1004a to 1004d form a UE group 1020. However, it should be noted that the relay link disclosed herein does not rely on a UE group.

[0232] The access network 1006 may assign a group identifier (ID) to the UE group 1020. The UE group ID may enable the access network 1006 to address the UE group 1020 as a whole and to distinguish the UE group 1020 from other UE groups. The UE group ID may also be used to broadcast information within the UE group; that is, to address all other UEs within the UE group 1020. The UE group 1020 may form a logical or virtual device mesh, wherein members of the UE group 1020 communicate with each other using UE communication over the sidelink air interface, but the UE group 1020 as a whole acts as a single distributed virtual transceiver relative to the access network 1006. For example, the UE group ID may be a group radio network temporary identifier (G-RNTI).

[0233] When a particular UE (e.g., UE 1004c) in UE group 1020 is being assisted or will be assisted in wireless communication between the UE and BS 1008a, the other UEs 1004a, 1004b, and 1004d in group 1020 can be considered candidates for relay UEs or assisting UEs. In a group-based embodiment, the subset of UEs assisting UE 1004c constitutes a cooperative active set or cooperative group. The cooperative active set can be dynamically selected to assist UE 1004c.

[0234] In UE group 1020, UEs 1004a, 1004b, and 1004d constitute a cooperation candidate set. If UEs 1004a and 1004b assist UE 1004c, UEs 1004a and 1004b constitute a cooperation active set. As UEs 1004a to 1004d move around, some UEs may leave UE group 1020. Additionally or alternatively, UE movement may cause other UEs to join UE group 1020. Thus, the cooperation candidate set may change over time. For example, the cooperation candidate set may change semi-statically. For example, if the network determines that UE group 1020 no longer needs or has no opportunity to assist wireless communications between BS 908a and members of UE group 1020, UE group 1020 may also be terminated by network 1006.

[0235] There may be more than one UE group. For example, Figure 11 UEs 1004e and 1004f in form another UE group 1022.

[0236] Figure 12 1 is a block diagram of an example of a network 1152 serving two UEs 1154a and 1154b provided in accordance with an embodiment. The network 1152 may be Figure 11 In the access network 1006, two UEs 1154a and 1154b can be Figure 11 Alternatively, UEs 1154a and 1154b may be two of the four UEs 1004a to 1004d. Figure 11 However, more generally, this is not necessarily the case, so in Figure 12 Different reference numerals are used in the drawings.

[0237] Network 1152 includes BS 1156 and management module 1158. Management module 1158 instructs BS 1156 to perform actions. Management module 1158 is shown as being physically separate from BS 1156 and coupled to BS 1156 via communication link 1160. For example, management module 1158 can be part of a server in network 1152. Alternatively, management module 1158 can be part of BS 1156.

[0238] The management module 1158 includes a processor 1162, a memory 1164, and a communication module 1166. The communication module 1166 is implemented by the processor 1162 when the processor 1162 accesses and executes a series of instructions stored in the memory 1164, which define the actions of the communication module 1166. When the instructions are executed, the communication module 1166 causes the BS 1156 to perform the actions described herein so that the network 1152 can establish, coordinate, instruct, or control relays, and may perform such operations for groups of UEs. Alternatively, the communication module 1166 can be implemented using dedicated circuitry, such as an application specific integrated circuit (ASIC) or a programmed field programmable gate array (FPGA).

[0239] UE 1154a includes a communication subsystem 1170a, two antennas 1172a and 1174a, a processor 1176a, and a memory 1178a. UE 1154a also includes a communication module 1180a. Communication module 1180a is implemented by processor 1176a when processor 1176a accesses and executes a series of instructions stored in memory 1178a. These instructions define the actions of communication module 1180a. When executing the instructions, communication module 1180a causes UE 1154a to perform one or more of the actions described herein with respect to relay UE, helper UE, and remote UE. Features related to establishing and participating in UE groups may also be supported. Alternatively, module 1180a may be implemented by dedicated circuitry (e.g., an ASIC or FPGA).

[0240] The communication subsystem 1170a includes processing circuitry, transmitting circuitry, and receiving circuitry for sending messages from and receiving messages at UE 1154a. Although one communication subsystem 1170a is shown, the communication subsystem 1170a may be multiple communication subsystems. Antenna 1172a transmits wireless communication signals to and receives wireless communication signals from BS 1156. Antenna 1174a transmits sidelink communication signals to and receives sidelink communication signals from other UEs (including UE 1154b). In some implementations, there may not be two separate antennas 1172a and 1174a. A single antenna may be used. Alternatively, there may be multiple antennas, but they are not separated into antennas used only for sidelink communication and antennas used only for communication with BS 1156.

[0241] SL communication can be carried out via Wi-Fi, in which case antenna 1174a can be a Wi-Fi antenna. Alternatively, sidelink communication can be carried out via Bluetooth TMIn this case, the antenna 1174a may be a Bluetooth TM Additionally or alternatively, sidelink communications may occur over licensed or unlicensed spectrum.

[0242] UE 1154b includes the same components described above with respect to UE 1154a, that is, UE 1154b includes a communication subsystem 1170b, antennas 1172b and 1174b, a processor 1176b, a memory 1178b, and a communication module 1180b.

[0243] Figure 11 and Figure 12 In some embodiments, the UE includes a processor (e.g. Figure 12 1176a, 1176b) and a non-transitory computer-readable storage medium (e.g., Figure 12 1178a, 1178b in ). Additionally or alternatively, the non-transitory computer-readable storage medium is provided separately as a computer program product. Examples are provided elsewhere herein.

[0244] Embodiments disclosed herein encompass, among others, the following embodiments.

[0245] Example 1 relates to a method, comprising: a UE receives signaling, the signaling including that the UE will switch between multiple communication paths, the multiple communication paths being established for communicating with wireless communication before receiving the signaling, the multiple communication paths including a first communication path and a second communication path, the first communication path including a relay path between the UE and the wireless communication network; the UE switches between the first communication path and the second communication path in response to the explicit indication to communicate with the wireless communication network.

[0246] Example 2 relates to the method of Example 1, wherein the receiving comprises receiving the signaling from a network device with which the UE directly communicates via the second communication path.

[0247] Example 3 relates to the method of Example 1 or Example 2, wherein the receiving comprises receiving the signaling from another UE participating in the relay path.

[0248] Example 4 relates to the method of Example 1, wherein the receiving comprises receiving the signaling through any one or more of the first communication path, the second communication path, and another communication path between the UE and the wireless communication network.

[0249] Example 5 relates to the method of Example 1, wherein the second communication path comprises another relay path between the UE and the wireless communication network.

[0250] Example 6 relates to the method of any one of Examples 1 to 5, wherein the signaling includes one or both of semi-static signaling and dynamic signaling.

[0251] Example 7 relates to the method of Example 6, wherein the signaling includes any one or more of the following: RRC signaling, MAC-CE signaling, DCI, SCI, header information, or explicit indication of data carrying.

[0252] Example 8 relates to the method of any one of Examples 1 to 7, wherein the switching includes switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path to communicate with the wireless communication network, wherein the explicit indication includes an explicit indication for switching from the one of the first communication path and the second communication path to the other of the first communication path and the second communication path.

[0253] Example 9 relates to the method of any one of Examples 1 to 7, wherein the switching includes switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path to communicate with the wireless communication network, wherein the explicit indication includes an explicit indication for deactivating the one of the first communication path and the second communication path.

[0254] Example 10 relates to the method of any one of Examples 1 to 7, wherein the switching includes switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path to communicate with the wireless communication network, wherein the explicit indication includes an explicit indication for switching from the one of the first communication path and the second communication path to the other of the first communication path and the second communication path, and wherein the signaling also includes an explicit indication for deactivating the one of the first communication path and the second communication path.

[0255] Example 11 relates to a method described in any one of Examples 1 to 7, wherein the switching includes switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path to communicate with the wireless communication network, wherein the explicit indication includes an explicit indication for switching from the one of the first communication path and the second communication path to the other of the first communication path and the second communication path, and wherein the method further includes: the UE receives another signaling, the another signaling including another explicit indication that the UE will deactivate the one of the first communication link and the second communication link; and the UE deactivates the one of the first communication link and the second communication link in response to the another explicit indication.

[0256] Example 12 relates to the method of any one of Examples 1 to 11, wherein the switching includes maintaining communication with the wireless communication network over both the first communication path and the second communication path during a transition period.

[0257] Example 13 relates to a method described in any one of Examples 1 to 11, wherein the switching includes switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path to communicate with the wireless communication network, wherein the switching includes: the UE starts monitoring the other of the first communication path and the second communication path in response to the explicit indication.

[0258] Example 14 relates to the method of any one of Examples 1 to 11, wherein the switching includes switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path to communicate with the wireless communication network, wherein the switching includes: the UE stops monitoring the one of the first communication path and the second communication path in response to the explicit indication or after a transition time period.

[0259] Example 15 relates to the method described in Example 12 or Example 13, wherein the transition time period is consistent with any one or more of the following: an indication of the transition time period provided in the received signaling; a time delay between receiving the signaling and receiving another signaling associated with deactivation of the first communication path or the second communication path; a predetermined time period; a time period between receiving the signaling and expiration of a timer; completion of a retransmission process initiated before the reception.

[0260] Example 16 relates to the method of any one of Examples 1 to 15, further comprising: the UE monitoring the first communication path and the second communication path after the first communication path and the second communication path are established before receiving the signaling.

[0261] Example 17 relates to a method comprising: communicating signaling by a first UE participating in a relay path including a first communication path between a wireless communication network and a second UE, the signaling including an explicit indication that the second UE will switch between the first communication path and the second communication path to communicate with the wireless communication network, the first communication path and the second communication path including establishing multiple communication paths for communication between the wireless communication network and the second UE prior to communicating the signaling; and operating the first UE in a manner consistent with the switching of the second UE between the first communication path and the second communication path.

[0262] Example 18 relates to the method of Example 17, wherein the communicating comprises receiving the signaling from a network device with which the second UE communicates via the first communication path, and wherein the operating comprises modifying the operation of the first UE in response to the explicit indication.

[0263] Example 19 relates to the method of Example 18, further comprising: the first UE providing an implicit indication or an explicit indication to the second UE in response to the explicit indication that the second UE will switch between the first communication path and the second communication path to communicate with the wireless communication network.

[0264] Example 20 relates to the method of Example 17, wherein the communicating includes sending the signaling to the second UE.

[0265] Example 21 relates to the method described in Example 20, further including: the first UE receives an implicit indication or another explicit indication that the second UE will switch between the first communication path and the second communication path to communicate with the wireless communication network, wherein the operation includes modifying the operation of the first UE in response to the implicit indication or the other explicit indication received by the first UE.

[0266] Example 22 relates to the method of any one of Examples 17 to 21, wherein the signaling includes one or both of semi-static signaling and dynamic signaling.

[0267] Example 23 relates to the method of Example 22, wherein the signaling includes any one or more of the following: RRC signaling, MAC-CE signaling, DCI, SCI, header information, or explicit indication of data carrying.

[0268] Example 24 relates to a method described in any one of Examples 17 to 23, wherein the explicit indication includes an explicit indication associated with switching from the first communication path to the second communication path, and wherein the operation includes ceasing to monitor communication traffic on the first communication path associated with the second UE.

[0269] Example 25 relates to a method described in any one of Examples 17 to 23, wherein the explicit indication includes an explicit indication associated with switching from the second communication path to the first communication path, and wherein the operation includes commencing monitoring of communication traffic on the first communication path associated with the second UE.

[0270] Example 26 relates to the method of any one of Examples 17 to 25, wherein the operation includes monitoring the communication service associated with the second UE in the first communication path during a transition period of the communication service being communicated through the second communication path.

[0271] Example 27 relates to the method of Example 26, wherein the transition time period is consistent with any one or more of: an indication of the transition time period provided in the signaling, a time delay between communication of the signaling and receipt of another signaling associated with deactivation of the first communication path; a predetermined time period; a time period between communication of the signaling and expiration of a timer; and completion of a retransmission process initiated before communication of the signaling.

[0272] Example 28 relates to a method, comprising: determining whether a path switching condition is met, the path switching condition including a condition for a UE to switch between multiple communication paths, the multiple communication paths being established for communicating with a wireless communication network before the determination, the multiple communication paths including a first communication path and a second communication path, the first communication path including a relay path between the UE and the wireless communication network; in response to determining that the path switching condition is met, sending signaling to cause the UE to switch between the first communication path and the second communication path to communicate with the wireless communication network, the signaling including an explicit indication that the UE will switch between the first communication path and the second communication path to communicate with the wireless communication network.

[0273] Example 29 relates to the method of Example 28, wherein the determining comprises: another UE participating in the relay link determining that the UE will switch between the first communication path and the second communication path to communicate with the wireless communication network.

[0274] Example 30 relates to the method of Example 29, wherein the determination is based on an implicit indication or another explicit indication received by the other UE.

[0275] Example 31 relates to the method of Example 28, further comprising, before the determining: establishing the first communication path and the second communication path.

[0276] Example 32 relates to the method of Example 28, wherein the sending comprises sending the signaling through any one or more of the first communication path, the second communication path, and another communication path between the UE and the wireless communication network.

[0277] Example 33 relates to the method of any one of Examples 28 to 32, wherein the signaling includes one or both of semi-static signaling and dynamic signaling.

[0278] Example 34 relates to the method of Example 33, wherein the signaling includes any one or more of the following: RRC signaling, MAC-CE signaling, DCI, SCI, header information, or explicit indication of data carrying.

[0279] Example 35 relates to the method of any one of Examples 28 to 34, wherein the explicit indication comprises an explicit indication for switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path.

[0280] Example 36 relates to the method of any one of Examples 28 to 34, wherein the signaling is used to cause the UE to switch from one of the first communication path and the second communication path to the other of the first communication path and the second communication path to communicate with the wireless communication network, wherein the explicit indication includes an explicit indication for deactivating the one of the first communication path and the second communication path.

[0281] Example 37 relates to the method of any one of Examples 28 to 34, wherein the explicit indication includes an explicit indication for switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path, and wherein the signaling also includes an explicit indication for deactivating the one of the first communication path and the second communication path.

[0282] Example 38 relates to a method described in any one of Examples 28 to 34, wherein the explicit indication includes an explicit indication for switching from one of the first communication path and the second communication path to the other of the first communication path and the second communication path, and wherein the method further includes: sending another signaling, the other signaling including another explicit indication that the UE will deactivate the one of the first communication path and the second communication path.

[0283] Example 39 relates to the method of any one of Examples 28 to 38, further comprising maintaining communication between the UE and the wireless communication network through the first communication path and the second communication path during a transition period.

[0284] Example 40 relates to a method described in any one of Examples 28 to 38, wherein the explicit indication includes an explicit indication for switching from the one of the first communication path and the second communication path to the other of the first communication path and the second communication path, and wherein the method further includes: copying the data of the UE on the first communication path and the second communication path during a transition time period.

[0285] Example 41 relates to the method described in Example 39 or Example 40, wherein the transition time period is consistent with any one or more of the following: an indication of the transition time period provided in the signaling; a time delay between sending the signaling and sending another signaling associated with deactivation of the first communication path or the second communication path; a predetermined time period; a time period between sending the signaling and expiration of a timer; completion of a retransmission process initiated before the sending.

[0286] Example 42 relates to an apparatus comprising: a communication interface; a processor coupled to the communication interface; and a non-transitory computer-readable storage medium coupled to the processor, storing a program executed by the processor, the program comprising instructions for executing any one of the methods described in Examples 1 to 41.

[0287] Example 43 relates to a computer program product comprising a non-transitory computer-readable storage medium storing a program comprising instructions for performing the method of any one of Examples 1 to 41.

[0288] What has been described is merely illustrative of the application of the principles of the embodiments of the present disclosure. Other arrangements and methods may be implemented by those skilled in the art.

[0289] For example, although combinations of features are shown in the illustrated embodiments, not all features need to be combined to achieve the benefits of the various embodiments of the present disclosure. In other words, a system or method designed according to an embodiment of the present disclosure does not necessarily include all features shown in any of the figures or all parts schematically shown in the figures. In addition, selected features of one exemplary embodiment may be combined with selected features of other exemplary embodiments.

[0290] Although the present disclosure has been described with reference to illustrative embodiments, this description is not to be construed in a limiting sense. Various modifications and combinations of the illustrative embodiments, as well as other embodiments of the present disclosure, will become apparent to those skilled in the art upon reference to this description. Therefore, the appended claims are intended to cover any such modifications or embodiments.

[0291] Although various aspects of the present invention have been described with reference to the specific features and embodiments of the present invention, various modifications and combinations of the present invention can be formulated without departing from the present invention. Therefore, the description and the drawings are only regarded as illustrations of some embodiments of the present invention as defined by the appended claims, and are intended to cover any and all modifications, variations, combinations or equivalents that fall within the scope of the present invention. Therefore, although the present invention and its advantages have been described in detail, various changes, substitutions and modifications can be made herein without departing from the present invention as defined by the appended claims. In addition, the scope of this application is not limited to the specific embodiments of the processes, machines, manufactured products, material components, modules, methods and steps described in the specification. It will be readily understood by those skilled in the art from the disclosure of the present invention that processes, machines, manufactured products, material components, modules, methods or steps (including currently existing or later developed) that perform or realize functions or results substantially the same as those of the corresponding embodiments described herein can be used according to the present invention. Therefore, the appended claims are intended to include these processes, machines, manufactured products, material components, modules, methods or steps within their scope.

[0292] In addition, although primarily described in the context of methods and apparatus, other implementations are also contemplated, such as instructions stored in a non-transitory processor-readable medium. Such media may store programs or instructions to perform any of the various methods consistent with the present disclosure.

[0293] In addition, any module, component, or device that executes instructions as illustrated herein may include or otherwise access one or more non-transitory computer-readable or processor-readable storage media to store information, such as computer-readable or processor-readable instructions, data structures, program modules, and / or other data. A non-exhaustive list of examples of non-transitory computer-readable or processor-readable storage media includes magnetic cassettes, magnetic tape, disk storage or other magnetic storage devices, compact disc read-only memory (CD-ROM), digital video disc or digital versatile disc (DVD), Blu-ray disc, TM Optical discs, or other optical storage, volatile and non-volatile, removable and non-removable media implemented in any method or technology, random-access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other storage technology. Any such non-transitory computer-readable or processor-readable storage medium can be part of a device or can be accessed or connected to a device. Any application or module described herein can be implemented using computer-readable and executable instructions, or a processor can be stored or otherwise held by such non-transitory computer-readable or processor-readable storage medium.

Claims

1. A method for fast path switching in wireless communication, characterized in that: include: A user equipment UE establishes a first communication path for communicating with a wireless communication network, and establishes a second communication path for communicating with the wireless communication network, wherein the first communication path or the second communication path includes a relay path between the UE and the wireless communication network, or both the first communication path and the second communication path include a relay path between the UE and the wireless communication network; communicating duplicate traffic over the first communication path and the second communication path; The UE receives signaling, where the signaling includes an explicit indication for releasing the first communication path; The UE releases the first communication path in response to the explicit instruction.

2. The method according to claim 1, characterized in that The first communication path and the second communication path are used for communication between the UE and a network device in the wireless communication network.

3. The method according to claim 1, characterized in that The first communication path is used for communication between the UE and a first network device in the wireless communication network, and the second communication path is used for communication between the UE and a second network device in the wireless communication network.

4. The method according to claim 1, wherein The signaling includes any one or more of the following: radio resource control RRC signaling, media access control-control element MAC-CE signaling, downlink control information DCI, sidelink control information SCI or header information.

5. The method according to claim 1, wherein The receiving the signaling and releasing the first communication path includes switching from the first communication path to the second communication path to communicate with the wireless communication network in response to the explicit instruction to release the first communication path.

6. The method according to any one of claims 1 to 5, characterized in that The communicating includes communicating the replicated traffic over both the first communication path and the second communication path during a transition period.

7. The method according to claim 6, characterized in that The transition time period is consistent with any one or more of the following: an indication of the transition time period provided in another signaling, wherein the other signaling includes an explicit indication for indicating a switch from the first communication path to the second communication path; a time delay between receiving the other signaling and receiving the signaling; a predetermined time period; a time period between receiving the other signaling and expiration of a timer; completion of a retransmission process initiated before receiving the other signaling.

8. The method according to any one of claims 1 to 5, characterized in that The UE starts monitoring the second communication path in response to the explicit indication for instructing switching from the first communication path to the second communication path.

9. The method according to any one of claims 1 to 5, characterized in that The UE stops monitoring the first communication path in response to an explicit indication for switching from the first communication path to the second communication path or after a transition period.

10. A device for fast path switching in wireless communication, characterized in that: include: processor; A computer-readable storage medium, coupled to the processor, storing a program executed by the processor, the program including instructions for: The device establishes a first communication path for communicating with a wireless communication network, and establishes a second communication path for communicating with the wireless communication network, wherein the first communication path or the second communication path includes a relay path between the device and the wireless communication network, or both the first communication path and the second communication path include a relay path between the device and the wireless communication network; The device communicates the duplicate traffic over the first communication path and the second communication path; The apparatus receives signaling, the signaling including an explicit indication for releasing the first communication path; The device releases the first communication path in response to the explicit indication.

11. The device according to claim 10, characterized in that The first communication path and the second communication path are used for communication between the apparatus and a network device in the wireless communication network.

12. The device according to claim 10, characterized in that The first communication path is used for communication between the apparatus and a first network device in the wireless communication network, and the second communication path is used for communication between the apparatus and a second network device in the wireless communication network.

13. The device according to claim 10, characterized in that The signaling includes any one or more of the following: radio resource control RRC signaling, media access control-control element MAC-CE signaling, downlink control information DCI, sidelink control information SCI or header information.

14. The device according to claim 10, characterized in that The instructions for receiving the signaling and releasing the first communication path include instructions for switching from the first communication path to the second communication path to communicate with the wireless communication network in response to the explicit indication to release the first communication path.

15. The device according to any one of claims 10 to 14, characterized in that The instructions to communicate include instructions to communicate the replicated traffic over both the first communication path and the second communication path during a transition period.

16. The device according to claim 15, characterized in that The transition time period is consistent with any one or more of the following: an indication of the transition time period provided in another signaling, wherein the other signaling includes an explicit indication for indicating a switch from the first communication path to the second communication path; a time delay between receiving the other signaling and receiving the signaling; a predetermined time period; a time period between receiving the other signaling and expiration of a timer; completion of a retransmission process initiated before receiving the other signaling.

17. The device according to any one of claims 10 to 14, characterized in that The instructions for communication include instructions for the following operations: The apparatus begins monitoring the second communication path in response to an explicit indication for switching from the first communication path to the second communication path.

18. The device according to any one of claims 10 to 14, characterized in that The instructions for communication include instructions for the following operations: The apparatus stops monitoring the first communication path in response to an explicit indication to switch from the first communication path to the second communication path or after a transition period.

19. A computer program product, characterized in that A computer-readable storage medium storing a program, the program comprising instructions for executing the method according to any one of claims 1 to 9.

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