WO2023208562A1 - Sélection de relais basée sur une communication directe de liaison latérale en mode 1 lors d'un changement de trajet - Google Patents

Sélection de relais basée sur une communication directe de liaison latérale en mode 1 lors d'un changement de trajet Download PDF

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Publication number
WO2023208562A1
WO2023208562A1 PCT/EP2023/059111 EP2023059111W WO2023208562A1 WO 2023208562 A1 WO2023208562 A1 WO 2023208562A1 EP 2023059111 W EP2023059111 W EP 2023059111W WO 2023208562 A1 WO2023208562 A1 WO 2023208562A1
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WIPO (PCT)
Prior art keywords
sidelink
user device
automatic repeat
hybrid automatic
repeat request
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PCT/EP2023/059111
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English (en)
Inventor
Stepan Kucera
Prajwal KESHAVAMURTHY
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Nokia Technologies Oy
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Publication of WO2023208562A1 publication Critical patent/WO2023208562A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/23—Manipulation of direct-mode connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the teachings in accordance with the exemplary embodiments of this invention relate generally to how a relay UE is selected as a base station for a path switch and, more specifically, relate to how a relay UE is selected as a base station for a path switch from a direct to an indirect path for the UE.
  • a purpose of a path switch procedure is to re-establish a UE associated signalling connection to a communication network, such as including switching a downlink termination point of a transport bearer towards a new termination point.
  • the path switch procedure uses UE-associated signalling.
  • Example embodiments of this invention improve at least such path switching operations.
  • FIG. 1 shows a flow chart of procedures for Remote UE switching to indirect Relay UE
  • FIG. 2A shows a problem of a path switch decision by gNB as it requires extensive SL resource pool monitoring and reporting by Remote UE, possibly at max UL power due to proximity to cell edge and/or blockage condition (primary motivation for path switch);
  • FIG. 2B shows one idea in accordance with example embodiments of the invention where HARQ feedback on SL Mode 1 or network controlled transmission allows efficiently identifying suitable Relay UEs without extensive measurement / reporting (relay UE is assumed to be the TX as it had a good Uu connection and can forward HARQ feedback to gNB);
  • FIG. 3 shows an illustration of a proposed scheme in accordance with example embodiments of the invention
  • FIG. 4 shows a flow chart of a proposed scheme in accordance with example embodiments of the invention.
  • FIG. 5 shows a high level block diagram of various devices used in carrying out various aspects of the invention.
  • FIG. 6A and FIG. 6B each show a method in accordance with example embodiments of the invention which may be performed by an apparatus.
  • DETAILED DESCRIPTION
  • example embodiments of the invention relate to how a relay UE is selected as a base station for a path switch from a direct to an indirect path for the UE.
  • Example embodiments of the invention relate to NR SL relay standards submissions in particular to the path switch procedures defined and agreed to as a baseline for Remote UE’s intra gNB mobility in RRC CONNECTED).
  • Example embodiments of the invention address how a relay UE is selected at the gNB when switching from direct to indirect path for the Remote UE.
  • FIG. 1 shows a flow chart of procedures for Remote UE switching to indirect Relay UE.
  • the path switch procedure for service continuity in L2 relay for the case of direct to indirect path switch are shown in FIG. 1.
  • Step 1 of FIG. 1 the Uu measurement configuration and measurement report signalling procedures is performed to evaluate both relay link measurement and Uu link measurement.
  • the measurement results from U2N Remote UE may be reported when configured reporting criteria is met.
  • the SL relay measurement report shall include at least U2N Relay UE ID, serving cell ID, and SL measurement quantity information.
  • SL measurement quantity may be SD-RSRP corresponding to the candidate Relay UEs.
  • the Remote UE is configured to report to gNB the measured quality of the PC5 link(s) to candidate Relay UE(s) so that the gNB can select the best Relay UE for given Remote UE.
  • a SL relay measurement report may include at least U2N Relay UE ID, serving cell ID, and SL measurement quantity information.
  • SL measurement quantity is the SD-RSRP associated with the candidate Relay UEs.
  • the Remote UE To report such SL measurements, the Remote UE must monitor SL discovery resource pool, detect discovery messages from candidate Relay UEs and measure their SD- RSRP, while performing the direct Uu measurement / communications with the gNB.
  • the example embodiments of the invention propose an efficient method for eliminating/reducing the need for:
  • FIG. 2A shows a problem of a path switch decision by gNB as it requires extensive SL resource pool monitoring and reporting by Remote UE, possibly at max UL power due to proximity to cell edge and/or blockage condition (primary motivation for path switch).
  • FIG. 5 Before describing the example embodiments of the present disclosure in detail, reference is made to FIG. 5 for illustrating a simplified block diagram of various electronic devices of one possible and non-limiting exemplary system that are suitable for use in practicing the example embodiments of the present disclosure.
  • FIG. 5 shows a block diagram of one possible and non-limiting exemplary system in which the example embodiments of the present disclosure may be practiced.
  • a Device A, a Device B 5, Device C 12, and a gNB/eNB 13 is in wireless communication with a wireless network 1 or network 1 as in FIG. 5.
  • the wireless network 1 or network 1 as in FIG. 5 can comprise a communication network such as a mobile network e.g., the mobile network 1 or first mobile network as disclosed herein. Any reference herein to a wireless network 1 as in FIG. 5 can be seen as a reference to any wireless network as disclosed herein. Further, the wireless network 1 as in FIG.
  • a UE is a wireless, typically mobile device that can access a wireless network.
  • the UE may be a mobile phone (or called a "cellular" phone) and/or a computer with a mobile terminal function.
  • the UE or mobile terminal may also be a portable, pocket, handheld, computer-embedded, vehicle-mounted mobile device, or arial device and performs a language signaling and/or data exchange with the RAN.
  • the Device A 10 can be a remote network device or candidate network device performing sidelink operations in accordance with example embodiments of the invention and Device A 10 includes one or more processors DP 10 A, one or more memories MEM 10B, and one or more transceivers TRANS 10D interconnected through one or more buses.
  • Each of the one or more transceivers TRANS 10D includes a receiver and a transmitter.
  • the one or more buses may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, and the like.
  • the one or more transceivers TRANS 10D which can be optionally connected to one or more antennas for communication to Device B 5, Device C 12, and/or gNB/eNB 13.
  • the one or more memories MEM 10B include computer program code PROG 10C.
  • the Device A 10 communicates with Device B 5, Device C 12, and/or gNB/eNB 13 via a wireless link 7, 15, or 5.
  • the one or more memories MEM 10B and the computer program code PROG IOC are configured to cause, with the one or more processors DP 10 A, the Device A 10 to perform one or more of the operations as described herein.
  • the Device B 5 can be a remote network device or candidate network device performing sidelink operations.
  • Device B 5 includes one or more processors DP 5A, one or more memories MEM 5B, and one or more transceivers TRANS 5D interconnected through one or more buses.
  • Each of the one or more transceivers TRANS 5D includes a receiver and a transmitter.
  • the one or more buses may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, and the like.
  • the one or more transceivers TRANS 5D which can be optionally connected to one or more antennas for communication to Device A 10, Device C 12, and/or gNB/eNB 13.
  • the one or more memories MEM 5B include computer program code PROG 5C.
  • the Device B 5 communicates with Device A 10, Device C 12, and/or gNB/eNB 13 via a wireless link 7, 6, or 11.
  • the one or more memories MEM 5B and the computer program code PROG 5C are configured to cause, with the one or more processors DP 5A, the Device B 5 to perform one or more of the operations as described herein.
  • the Device C 12 can be a remote network device or candidate network device performing sidelink operations.
  • the Device C 12 includes one or more processors DP 13 A, one or more memories MEM 13B, one or more network interfaces, and one or more transceivers TRANS 12D interconnected through one or more buses.
  • these network interfaces of Device C 12 can include X2 and/or Xn interfaces and/or other interfaces for use to perform the example embodiments of the present disclosure.
  • Each of the one or more transceivers TRANS 12D includes a receiver and a transmitter that can optionally be connected to one or more antennas.
  • the one or more memories MEM 12B include computer program code PROG 12C.
  • the one or more memories MEM 12B and the computer program code PROG 12C are configured to cause, with the one or more processors DP 13A, the Device C 12 to perform one or more of the operations as described herein.
  • the Device C 12 may communicate with the Device A 10, Device B 5, and/or gNB/eNB 13 or any other device using, e.g., at least link 5 and/or link 11 and/or link 8.
  • the link, 5, 7, 11, or 8 as shown in FIG. 5 can be used for communication between the Device C 12, and Device A 10, Device B 5, and/or gNB/eNB 13.
  • any of the link as disclosed herein can comprise one or more sidelink links. In addition, any of these links.
  • the eNB/gNB 13 is a network node that communicates with devices such as Device C 12, Device B 5, and/or Device A 10 of FIG. 5.
  • the Device C 12 can be associated with a mobility function device such as an AMF or SMF, further the Device C 12 may comprise a NR/5G Node B or possibly an evolved NB, a base station such as a master or secondary node base station (e.g., for NR or LTE) that communicates with devices such as the Device A 10 and/or Device B 5 and/or Device C 12 in the wireless network 1.
  • the gNB/eNB 13 provides access to wireless devices such as the Device A, Device B 5, and/or Device C 12 to the wireless network 1.
  • the gNB/eNB 13 includes one or more processors DP 13A, one or more memories MEM 13B, and one or more transceivers TRANS 13D interconnected through one or more buses.
  • these TRANS 13D can include X2 and/or Xn and/or other interfaces for use to perform the example embodiments of the present disclosure.
  • Each of the one or more transceivers TRANS 13D includes a receiver and a transmitter.
  • the one or more transceivers TRANS 13D can be optionally connected to one or more antennas for communication over at least link 8, link 6, and/or link 15.
  • the TRANS 13D can connect with the Device B 5 and/or Device A 10 and/or Device C 12 via links 6, link 15, and/or link 8.
  • the one or more memories MEM 13B and the computer program code PROG 13C are configured to cause, with the one or more processors DP 13 A, the gNB/eNB 13 to perform one or more of the operations as described herein.
  • the gNB/eNB 13 may communicate with another device such as the Device A 10, Device B 5, and/or Device C 12 such as via links 6, link 15, and/or link 8.
  • Further any of the links as disclosed herein may be wired or wireless or both. Further any of the links as disclosed herein may be configured to be through other network devices such as, but not limited to an SGW/AMF/UPF device such as the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 of FIG. 5.
  • the gNB/eNB 13 may perform functionalities of a Mobility Management Entity (MME), Serving Gateway (SGW), Unified Data Management (UDM), Policy Control Function (PCF), User Plane Function (UPF), Access and Mobility Management Function (AMF) and/or a Location Management function (LMF) for LTE and similar functionality for 5G.
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • UDM Unified Data Management
  • PCF Policy Control Function
  • UPF User Plane Function
  • AMF Access and Mobility Management Function
  • LMF Location Management function
  • LMF Location Management Function
  • the LMF functionality may be embodied in either of the Device A 10, Device B 5, Device C 12, and/or gNB/eNB 13 or may be part of these network devices or other devices associated with these devices.
  • an LMF such as the LMF of the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 of FIG. 5, as at least described below, can be co-located with the Device A 10, Device B 5, Device C 12, and/or gNB/eNB 13 such as to be separate from the gNB/eNB 13 and/or Device C 12 of FIG. 5 for performing operations in accordance with example embodiments of the invention as disclosed herein.
  • links 5, 6, 7, 8, 11, 15, 16, and 9 may implement Xn/X2 e.g., between the Device A, Device B 5, Device C 12, can include an X2/Xn interface type link.
  • any of these links may be through other network devices such as, but not limited to an MME/SGW device such as the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 of FIG. 5.
  • the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 of FIG. 5 may be used to control any functions of any of the devices of the Network 1 as shown in FIG. 5.
  • the one or more buses of the device of FIG. 5 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like.
  • the one or more transceivers TRANS 12D, TRANS 13D, TRANS 5D, and/or TRANS 10D may be implemented as a remote radio head (RRH), with the other elements of the Device A, Device B 5, Device C 12, and/or gNB/eNB 13 being physically in a different location from the RRH, and one or more buses could be implemented in part as fiber optic cable to connect the other elements of the Device A 10, Device B 5, Device C 12, and/or gNB/eNB 13 to a RRH for example.
  • RRH remote radio head
  • FIG. 5 shows a network nodes Such as Device A 10, Device B 5, Device C 12, and/or gNB/eNB 13. Any of these nodes can communicate with an eNodeB or eNB or gNB such as for LTE and NR, and would still be configurable to perform example embodiments of the present disclosure.
  • a network nodes such as Device A 10, Device B 5, Device C 12, and/or gNB/eNB 13. Any of these nodes can communicate with an eNodeB or eNB or gNB such as for LTE and NR, and would still be configurable to perform example embodiments of the present disclosure.
  • cells perform functions, but it should be clear that the gNB that forms the cell and/or a user equipment and/or mobility management function device that will perform the functions. In addition, the cell makes up part of a gNB, and there can be multiple cells per gNB.
  • the wireless network 1 or any network it can represent may or may not include a MME/SGW/UDM/PCF/AMF/SMF/LMF 14 that may include Mobility Management Entity (MME), and/or Serving Gateway (SGW), and/or Unified Data Management (UDM), and/or Policy Control Function (PCF), and/or Access and Mobility Management Function (AMF), and/or Session Management Function (SMF), and/or Authentication Server Function (AUSF) and/or Location Management Function (LMF) and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the Internet), and which is configured to perform any 5G and/or NR operations in addition to or instead of other standards operations at the time of this application.
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • UDM Unified Data Management
  • PCF Policy Control Function
  • AMF Access and Mobility Management Function
  • SMF Access and Mobility Management Function
  • SMF Access and Mobility Management Function
  • SMF Access and Mobility Management Function
  • the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 is configurable to perform operations in accordance with example embodiments of the present disclosure in any of an LTE, NR, 5G and/or any standards based communication technologies being performed or discussed at the time of this application.
  • the operations in accordance with example embodiments of the present disclosure, as performed by the gNB/eNB 13 may also be performed at the MME/SGW/UDM/PCF/AMF/SMF/LMF 14.
  • the LMF receives measurements and assistance information from the communication network and user equipment (UE). This can be via an Access and Mobility Management Function (AMF) over an interface to determine a position of the UE.
  • the Device B 5 and/or the Device A 10 and/or Device C 12 as in FIG. 5 may communicate with the LMF via at least any of links 9 and 16.
  • the gNB/eNB 13 can, if necessary, then further communicate with the LMF of the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 of FIG. 5 via the link 16 as in FIG. 5.
  • link 16 or link 9 can connect to any of links 5, 6, 7, 8, 11, 15, 16, and 9 as needed between Device B 5, Device A 10, Device C 12, gNB/eNB 13 and the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 of FIG. 5 for any of these devices to communicate with at least the LMF of the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 of FIG. 5.
  • any of links that are mentioned in this paper can include hardwired links and/or wireless links and, as needed, and/or include any type of interface (e.g., LTE and/or 5G interface) such as but not limited to at least one of an Xn, X2, SI, NG, NG-C, NLs, El, and/or Fl type interface.
  • LTE and/or 5G interface e.g., LTE and/or 5G interface
  • the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 includes one or more processors DP 14A, one or more memories MEM 14B, and one or more network interfaces (N/W I/F(s)), interconnected through one or more buses coupled with at least links 16 and 9.
  • Communication between the gNB/eNB 13 and the LMF may be performed via an Access and Mobility Management function (AMF) e.g., of the MME/SGW/UDM/PCF/AMF/SMF/LMF 14.
  • a control plane interface between gNB/eNB 13 and/or any devices and AMF can be an NG-C interface and an interface between the AMF and LMF can be NLs.
  • these network interfaces can include X2 and/or Xn and/or other interfaces for use to perform the example embodiments of the present disclosure.
  • the one or more memories MEM 14B include computer program code PROG 14C.
  • the one or more memories MEM14B and the computer program code PROG 14C are configured to, with the one or more processors DP 14 A, cause the MME/SGW/UDM/PCF/AMF/SMF/LMF 14 to perform or work with the gNB/eNB 13 or any of the Devices to perform one or more operations which may be needed to support the operations in accordance with the example embodiments of the present disclosure.
  • the wireless Network 1 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network.
  • Network virtualization involves platform virtualization, often combined with resource virtualization.
  • Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system.
  • virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors DP 10, DP12A, DP13A, DP5A, and/or DP14A and memories MEM 10B, MEM 12B, MEM 13B, MEM 5B, and/or MEM 14B, and also such virtualized entities create technical effects.
  • the computer readable memories MEM 12B, MEM 13B, MEM 5B, and MEM 14B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the computer readable memories MEM 12B, MEM 13B, MEM 5B, and MEM 14B may be means for performing storage functions.
  • the processors DP10, DP12A, DP13A, DP5A, and DP14A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • the processors DP10, DP12A, DP13A, DP5A, and DP14A may be means for performing functions, such as controlling the Device A 10, Device B 5, gNB/eNB 13, Device C 12, and other functions as described herein.
  • various embodiments of the Device A 10, Device B 5 and/or Device C 12 can include, but are not limited to, cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • the various embodiments of Device A 10, Device B 5 and/or Device C 12 can be used with a UE vehicle, a High Altitude Platform Station, or any other such type node associated with a terrestrial network or any drone type radio or a radio in aircraft or other airborne vehicle.
  • the example embodiments of the invention propose an efficient method for eliminating/reducing the need for monitoring the SL discovery resource pool, and explicit reporting of SL measurement at the Remote UE when the Remote UE is a receiver of a NR SL mode 1 or network-controlled communication.
  • the invention eliminates / reduces the need for monitoring SL discovery resource pool as well as explicit reporting of SL measurement by the Remote UE, when the Remote UE is a receiver of a NR SL mode 1 communication from relay-capable transmitter UE. In this way, significant power savings and overhead reduction is achieved in UE, a critical advantage as Relay DRX is not yet possible.
  • the invention proposes a signalling/power-efficient method for selecting a Relay UE for a Remote UE during a path switch from a direct Uu link to an indirect Relay link (e.g., whenever the direct path of the Remote UE degrades).
  • the serving gNB determines whether a given transmitter UE (Tx UE) performing a Mode-1 SL transmission to the Remote UE can become an acceptable Relay UE for the Remote UE based on the PC5 HARQ and/or channel quality feedback (or any similar information) reported to the gNB by said Tx UE in relation to the SL transmission to the Remote UE (see Fig. 2),
  • the acceptable Relay UE can be based on a percentage or fraction of ACKs or NACKs and/or an absolute number of ACKs or NACKs.
  • the gNB may further configure / permit the Remote UE to stop or at least reduce or condition-based the monitoring of the SL discovery resource pool and/or the associated reporting over the direct Uu link to the gNB.
  • this overhead reporting is eliminated only for the duration of a Mode-1 PC5 transmission between the Remote and the Transmitter- Relay UE, i.e., for the duration of the PC5 HARQ and/or channel quality feedback.
  • the Remote UE may also determine whether to monitor SL discovery pool and/or provide PC5 measurement report with reduced list of candidate Relay UEs.
  • the remote UE may influence the gNB to select the UE with whom the remote UE has an active PC5 connection as relay by sending reports only on this PC5-active UE and ignoring others.
  • the remote UE knows the PC5 link parameters such as an L2 ID and signal SL-RSPR, it can even generate the postdiscovery report to the gNB without undergoing the actual discovery procedure (less overhead / latency).
  • FIG. 2B shows one idea in accordance with example embodiments of the invention where HARQ feedback on SL Mode 1 transmission allows efficiently identifying suitable Relay UEs without extensive measurement / reporting (relay UE is assumed to be the TX as it had a good Uu connection and can forward HARQ feedback to gNB);
  • Step 0 Remote UE is currently performing communication with gNB over direct link and also concurrently being a recipient of ongoing mode 1 SL transmissions from a relay- capable SL Tx UE;
  • Step 1 gNB checks if there are any ongoing mode 1 SL transmissions for which the Remote UE is a recipient; Step 2: if there are ongoing mode 1 SL transmissions from a relay-capable SL Tx UE towards the Remote UE, gNB determines if the corresponding PC5 link quality is above a configurable threshold based on the HARQ feedback received from the SL Tx UE on its transmission to the Remote UE:
  • - PC5 link quality can also be determined based on one or more of the following feedback items when reported by the SL Tx UE: o configurable number of SL HARQ NACKs, o configurable number of SL retransmissions, o configurable number of failed parity checks while LDPC decoding on SL, o SL RSRP being below a configurable SL RSRP threshold, and o SL SINR being below a configurable SL SINR threshold;
  • Step 3 When the PC5 link quality between Mode 1 SL Tx UE and the Remote UE is observed to be above the configured threshold, gNB may determine the SL Tx UE as the Relay UE should the path switch be performed;
  • Step 4 as the Relay UE has already been chosen in Step 4 (should the path switch be performed), gNB may configure Remote UE to:
  • Remote UE may be configured to monitor only the link associated with the existing PC5 communications, and/or Conditional reporting of PC5 measurements of candidate Relay UEs, where the Remote UE performs measurement reporting only if e.g. : o If HARQ NACK FB (or ACK FB) reported by the Remote UE on the PC5 link for the existing PC5 communication is above a configured number of NACKs (or below a configured number of ACKs), and/or o If SD-RSRP is above a certain threshold;
  • Step 5 Remote UE evaluates the measurement condition using e.g., PC5 link quality of the existing direct communication mode-1 links and/or SD-RSRP measurements if configured, and reports PC5 measurement as per the configuration;
  • Step 6 gNB determines deterioration of the direct path above a certain threshold observation of the direct-path deterioration can be determined following the:
  • Step 7 Up on determination of deterioration of the direct path above a certain threshold, the gNB selects SL Tx UE (UE-2) as the Relay UE; and
  • Step 8 gNB performs path switch to indirect link via Relay UE-2 (TX UE of the mode- 1 SL communication).
  • FIG. 4 shows a flow chart of a proposed scheme in accordance with example embodiments of the invention.
  • the remote UE is performing Uu communication.
  • the UE is a receiver (Rx) of a mode 1 or network controlled communication with another UE. If ‘no’ to step 420 then legacy behavior is applied. If ‘yes’ to step 420 then as shown in step 440 of FIG. 4 it is determined if the link quality with the another UE is above a threshold. Then as shown in step 450 of FIG. 4 it is determined if the another UE can be a standby relay UE for the UE if the link degrades. If ‘yes’ to step 450 then the another UE is assigned as standby relay UE for the UE and a measurement reporting configuration of the UE is modified.
  • FIG. 6A illustrates operations which may be performed by a user device such as, but not limited to, a network node such as gNB/eNB 13 as in FIG. 5 or an eNB.
  • a user device such as, but not limited to, a network node such as gNB/eNB 13 as in FIG. 5 or an eNB.
  • step 610 there is identifying, by a network node of a communication network, at least one sidelink transmission to a user device from at least one candidate user device for a path switch of at least one ongoing transmission with the user device.
  • step 620 of FIG. 6A there is determining a link quality of the at least one ongoing sidelink transmission.
  • step 630 of FIG. 6A there is, based on the determining, sending towards the user device information comprising an indication of a selection of a candidate user device associated with the at least one ongoing sidelink transmission for the path switch operation of the user device.
  • the at least one ongoing sidelink transmission comprises at least one network controlled sidelink transmission.
  • determining that the link quality of the at least one ongoing sidelink transmission is based at least on reception of an acknowledgement or negative acknowledgement from the at least one candidate user device for the at least one ongoing sidelink transmission.
  • the acknowledgement or negative acknowledgement can comprise hybrid automatic repeat request feedback.
  • the identifying the path switch operation for the at least one ongoing sidelink transmission to a user device is based on signal degradation of a direct path between the user device and the network node.
  • the at least one post discovery report is based on layer-2 identification and signal sidelink reference signal received power parameters.
  • the indication causes the user device to at least one of: not monitor sidelink discovery resource pool for power saving, not to report sidelink measurements of candidate user devices over direct link, or reduce monitoring of sidelink resource pool for candidate user devices, wherein the user device may be configured to monitor only the link associated with the existing PC5 communications.
  • the indication causes the user device to perform conditional reporting of sidelink measurements of candidate user devices, where the user device performs measurement reporting only if at least one of: a number of hybrid automatic repeat request negative acknowledgement is above a pre-configured number of hybrid automatic repeat request negative acknowledgements reported by the user device on the sidelink for the existing sidelink communication; a percentage of hybrid automatic repeat request negative acknowledgement reported by the user device on the sidelink for the existing sidelink communication is above a pre-configured percentage of hybrid automatic repeat request negative acknowledgements, a sidelink discovery reference signal received power is above or below a threshold for the indicated candidate user device, a sidelink discovery reference signal received power is above a certain threshold, or a sidelink discovery reference signal received power is above a certain threshold for the at least one candidate user device.
  • the identifying the path switch operation for the at least one ongoing sidelink transmission to a user device is based on detecting deterioration of a direct path between the network node and the candidate user device, wherein the detecting comprises determining the deterioration is above a predetermined threshold.
  • determining that the link quality of the at least one ongoing sidelink transmission is based on feedback from the at least one candidate user device comprising at least one of: a pre-defined number of sidelink hybrid automatic repeat request negative acknowledgements, a pre-defined number of sidelink retransmissions, a pre-defined number of failed parity checks while low-density parity-check decoding on the sidelink transmission, a sidelink reference signal received power being below a pre-defined sidelink reference signal received power threshold, or a sidelink signal-to-interference-plus-ratio being below a pre-defined sidelink signal-to-interference-plus-ratio threshold.
  • the at least one ongoing sidelink transmission comprises at least one network controlled sidelink transmission.
  • the information comprises at least one of: : a pre-defined number of sidelink hybrid automatic repeat request negative acknowledgements is above a predetermined threshold, a percentage of a pre-defined number of sidelink hybrid automatic repeat request negative acknowledgements is above a pre-determined threshold, a predefined number of sidelink hybrid automatic repeat request acknowledgements is below a pre-determined threshold, a percentage of a pre-defined number of sidelink hybrid automatic repeat request acknowledgements is below a pre-determined threshold, a predefined number of sidelink retransmissions is above a pre-determined threshold, a predefined number of failed parity checks while low-density parity-check decoding on the sidelink transmission is above a pre-determined threshold, a sidelink reference signal received power is below a pre-defined sidelink reference signal received power threshold, or a sidelink signal-to-interference-plus-ratio is below a pre-defined sidelink signal-to- interference-plus-ratio threshold.
  • the path switch operation is based on at least one ongoing transmission with the user device to a path consisting of the at least one candidate user device
  • determining the path switch operation for the at least one ongoing transmission with a user device is based on signal degradation of a direct path between the user device and the network node.
  • the information comprises a measurement report configuration
  • the measurement report configuration causes the user device to at least one of stop, reduce, or condition-base monitoring of at least one of a sidelink discovery resource pool or associated reporting over a direct link to the network node.
  • the measurement report configuration causes the user device to at least one of monitor a sidelink discovery resource pool or provide a sidelink measurement report with a reduced list of candidate user devices.
  • the measurement report configuration causes the user device to report sidelink measurements of only active sidelink connections with candidate user devices of the at least one candidate user device.
  • the at least one post discovery report is based on layer-2 identification and signal sidelink reference signal received power parameters.
  • the indication causes the user device to at least one of: not monitor sidelink discovery resource pool for power saving, not to report sidelink measurements of candidate user devices over direct link, or reduce monitoring of sidelink resource pool for candidate user devices, wherein the user device may be configured to monitor only the link associated with the existing PC5 communications.
  • the indication causes the user device to perform conditional reporting of sidelink measurements of candidate user devices
  • the network deice performs measurement reporting only if at least one of: a number of hybrid automatic repeat request negative acknowledgement reported by the user device on the sidelink for the existing sidelink communication is above a pre-configured number of hybrid automatic repeat request negative acknowledgements, a percentage of hybrid automatic repeat request negative acknowledgement reported by the user device on the sidelink for the existing sidelink communication is above a pre-configured percentage of hybrid automatic repeat request negative acknowledgements, a sidelink discovery reference signal received power is above or below a threshold for the indicated candidate user device, a sidelink discovery reference signal received power is above a certain threshold, or a sidelink discovery reference signal received power is above a certain threshold for the at least one candidate user device.
  • the identifying is based on detecting deterioration of a direct path between the network node and the user device, wherein the detecting comprises determining the deterioration is above a predetermined threshold.
  • detecting the deterioration is based on observation of at least one of: a predefined number of hybrid automatic repeat request negative acknowledgements, a predefined number of retransmissions, a pre-defined number of failed parity checks while low-density parity-check decoding, a reference signal receive power being below a predefined reference signal receive power threshold, or a signal-to-interference-plus-noise ratio being below a pre-defined signal-to-interference-plus-noise ratio threshold.
  • a non-transitory computer-readable medium (MEM 13B as in FIG. 5) storing program code (PROG 13C as in FIG. 5), the program code executed by at least one processor (DP 14A as in FIG. 5) to perform the operations as at least described in the paragraphs above.
  • an apparatus comprising: means for identifying (TRANS 13D, MEM 13B, PROG 13C, and DP 13A as in FIG. 5), by a network node (gNB/eNB 13 as in FIG. 5) of a communication network (Network 1 as in FIG. 5), at least one sidelink transmission to a user device from at least one candidate user device for a path switch of at least one ongoing transmission with the user device; means for determining (TRANS 13D, MEM 13B, PROG 13C, and DP 13 A as in FIG.
  • a link quality of the at least one ongoing sidelink transmission is above a pre-determined threshold; and means, based on the determining, for sending (TRANS 13D, MEM 13B, PROG 13C, and DP 13A as in FIG. 5) towards the user device information comprising an indication of a selection of a candidate user device associated with the at least one ongoing sidelink transmission for the path switch operation of the user device.
  • At least the means for identifying, determining, and sending comprises a non- transitory computer readable medium [MEM 13B as in FIG. 5] encoded with a computer program [PROG 13C as in FIG. 5] executable by at least one processor [DP 13A as in FIG. 5].
  • FIG. 6B illustrates operations which may be performed by a device such as, but not limited to, a device (e.g., the Device A, Device B, and/or Device C as in FIG. 5).
  • a device e.g., the Device A, Device B, and/or Device C as in FIG. 5.
  • step 650 of FIG. 6B there is receiving, by a user device of a communication network, from a network node an indication of a selection of a candidate user device associated with at least one ongoing sidelink transmission to the user device for a path switch operation of the user device.
  • the selection is based on a link quality of the at least one ongoing sidelink transmission.
  • the at least one ongoing sidelink transmission comprises at least one or network controlled sidelink transmission.
  • the link quality of the at least one ongoing sidelink transmission is based at least on reception of an acknowledgement or negative acknowledgement from the at least one candidate user device for the at least one ongoing sidelink transmission.
  • the acknowledgement or negative acknowledgement can comprise hybrid automatic repeat request feedback.
  • the link quality of the at least one ongoing sidelink transmission is based on feedback from the at least one candidate user device comprising at least one of: a predefined number of sidelink hybrid automatic repeat request negative acknowledgements, a pre-defined number of sidelink retransmissions, a pre-defined number of failed parity checks while low-density parity-check decoding on the sidelink transmission, a sidelink reference signal received power being below a pre-defined sidelink reference signal received power threshold, or a sidelink signal-to-interference-plus-ratio being below a predefined sidelink signal-to-interference-plus-ratio threshold.
  • the at least one ongoing sidelink transmission comprises at least one network controlled sidelink transmission.
  • the link quality of the at least one ongoing sidelink transmission is based on information from the at least one candidate user device.
  • the information comprises at least one of : a pre-defined number of sidelink hybrid automatic repeat request negative acknowledgements is above a predetermined threshold, a percentage of a pre-defined number of sidelink hybrid automatic repeat request negative acknowledgements is above a pre-determined threshold, a predefined number of sidelink hybrid automatic repeat request acknowledgements is below a pre-determined threshold, a percentage of a pre-defined number of sidelink hybrid automatic repeat request acknowledgements is below a pre-determined threshold, a predefined number of sidelink retransmissions is above a pre-determined threshold, a predefined number of failed parity checks while low-density parity-check decoding on the sidelink transmission is above a pre-determined threshold, a sidelink reference signal received power is below a pre-defined sidelink reference signal received power threshold, or a sidelink signal-to-interference-plus-ratio is below a pre-defined sidelink signal-to- interference-plus-ratio threshold.
  • the path switch operation is based on at least one ongoing transmission with the user device to a path consisting of the at least one candidate user device.
  • the path switch operation is based on signal degradation of a direct path between the network node and the user device that is above a predetermined threshold.
  • the information comprises a measurement report configuration, and wherein the measurement report configuration causes the user device to at least one of stop, reduce, or condition-base monitoring of at least one of a sidelink discovery resource pool or associated reporting over a direct link to the network node.
  • the measurement report configuration causes the user device to at least one of monitor a sidelink discovery resource pool or provide a sidelink measurement report with a reduced list of candidate user devices.
  • the measurement report configuration causes the user device to report sidelink measurements of only active sidelink connections with candidate user devices of the at least one candidate user device.
  • the at least one post discovery report is based on layer-2 identification and signal sidelink reference signal received power parameters.
  • the indication causes the user device to at least one of: not monitor sidelink discovery resource pool for power saving, not to report sidelink measurements of candidate user devices over direct link, or reduce monitoring of sidelink resource pool for candidate user devices, wherein the network device may be configured to monitor only the link associated with the existing PC5 communications.
  • the indication causes the user device to perform conditional reporting of sidelink measurements of candidate user devices
  • the network deice performs measurement reporting only if at least one of: a number of hybrid automatic repeat request negative acknowledgement reported by the user device on the sidelink for the existing sidelink communication is above a pre-configured number of hybrid automatic repeat request negative acknowledgements, a percentage of hybrid automatic repeat request negative acknowledgement reported by the user device on the sidelink for the existing sidelink communication is above a pre-configured percentage of hybrid automatic repeat request negative acknowledgements, a sidelink discovery reference signal received power is above or below a threshold for the indicated candidate user device, a sidelink discovery reference signal received power is above a certain threshold, or a sidelink discovery reference signal received power is above a certain threshold for the at least one candidate user device.
  • the path switch operation is based on detecting deterioration of a direct path between the user device and the network node, wherein the detecting comprises determining the deterioration is above a predetermined threshold.
  • detecting the deterioration is based on observation of at least one of: a predefined number of hybrid automatic repeat request negative acknowledgements, a predefined number of retransmissions, a pre-defined number of failed parity checks while low-density parity-check decoding, a reference signal receive power being below a predefined reference signal receive power threshold, or a signal-to-interference-plus-noise ratio being below a pre-defined signal-to-interference-plus-noise ratio threshold.
  • a non-transitory computer-readable medium (MEM 5B, MEM 10B, and/or MEM 12B as in FIG. 5) storing program code (PROG 5C, PROG 10C, and/or PROG 12C as in FIG. 5), the program code executed by at least one processor (DP 5 A, DP 10 A, and/or DP 12A as in FIG. 5) to perform the operations as at least described in the paragraphs above.
  • an apparatus comprising: means for receiving (TRANS 5D, TRANS 10D, and/or TRANS 12D; MEM 5B, MEM 10B, and/or MEM 12B; PROG 5C, PROG 10C, and/or PROG 12C; and DP 5A, DP 10A, and/or DP 12A as in FIG. 5), by a user device (Device A, Device B, and/or Device C as in FIG. 5) of a communication network (Network 1 as in FIG. 5), from a network node (gNB/eNB 13 as in FIG.
  • information comprising an indication of a selection (TRANS 5D, TRANS 10D, and/or TRANS 12D; MEM 5B, MEM 10B, and/or MEM 12B; PROG 5C, PROG 10C, and/or PROG 12C; and DP 5A, DP 10 A, and/or DP 12A as in FIG. 5) of a candidate user device associated with at least one ongoing sidelink transmission to the user device for a path switch operation of the user device, wherein the selection is based on a link quality of the at least one ongoing sidelink transmission.
  • At least the means for identifying, determining, and sending comprises a non- transitory computer readable medium [MEM 5B, MEM 10B, and/or MEM 12B as in FIG. 5] encoded with a computer program [PROG 5C, PROG 10C, and/or PROG 12C as in FIG. 5] executable by at least one processor [DP 5 A, DP 10A, and/or DP 12A as in FIG. 5].
  • MEM 5B, MEM 10B, and/or MEM 12B as in FIG. 5 encoded with a computer program [PROG 5C, PROG 10C, and/or PROG 12C as in FIG. 5] executable by at least one processor [DP 5 A, DP 10A, and/or DP 12A as in FIG. 5].
  • pre-defined as used herein is not limiting, and this term pre-defined can be intended to mean pre-defined, pre-configured, or predetermined.
  • circuitry for performing operations in accordance with example embodiments of the invention as disclosed herein.
  • This circuitry can include any type of circuitry including content coding circuitry, content decoding circuitry, processing circuitry, image generation circuitry, data analysis circuitry, etc.).
  • this circuitry can include discrete circuitry, application-specific integrated circuitry (ASIC), and/or field-programmable gate array circuitry (FPGA), etc. as well as a processor specifically configured by software to perform the respective function, or dual-core processors with software and corresponding digital signal processors, etc.).
  • ASIC application-specific integrated circuitry
  • FPGA field-programmable gate array circuitry
  • circuitry can include at least one or more or all of the following:
  • any portions of hardware processor(s) with software including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions, such as functions or operations in accordance with example embodiments of the invention as disclosed herein);
  • circuitry for performing at least novel operations as disclosed in this application, this 'circuitry' as may be used herein refers to at least the following:
  • circuits and software (and/or firmware), such as (as applicable): (i) to a combination of processor(s) or (ii) to portions of processor(s)/software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions); and
  • circuits such as a microprocessor(s) or a portion of a microprocessor s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • circuitry would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in a server, a cellular network device, a user device, a user equipment, or other network device.
  • the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • While various aspects of the invention may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • Embodiments of the inventions may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process.
  • Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.
  • connection means any connection or coupling, either direct or indirect, between two or more elements, and may encompass the presence of one or more intermediate elements between two elements that are “connected” or “coupled” together.
  • the coupling or connection between the elements can be physical, logical, or a combination thereof.
  • two elements may be considered to be “connected” or “coupled” together by the use of one or more wires, cables and/or printed electrical connections, as well as by the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency region, the microwave region and the optical (both visible and invisible) region, as several non-limiting and non-exhaustive examples.

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Abstract

La présente divulgation concerne des systèmes, des procédés, des appareils et des produits programmes d'ordinateur pour permettre une sélection de relais basée sur une communication directe de liaison latérale en Mode 1 lors d'un changement de trajet. Un procédé peut consister à recevoir, d'un nœud de réseau, par un dispositif utilisateur d'un réseau de communication, l'indication d'une sélection d'un dispositif utilisateur candidat associé à au moins une transmission de liaison latérale en cours vers le dispositif utilisateur pour une opération de changement de trajet du dispositif utilisateur. La sélection est basée sur la qualité de liaison de la ou des transmissions de liaison latérale en cours.
PCT/EP2023/059111 2022-04-29 2023-04-06 Sélection de relais basée sur une communication directe de liaison latérale en mode 1 lors d'un changement de trajet WO2023208562A1 (fr)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2021143464A1 (fr) * 2020-01-15 2021-07-22 大唐移动通信设备有限公司 Procédé et dispositif de sélection de dispositif de relais et support d'enregistrement informatique
US20220103997A1 (en) * 2020-09-29 2022-03-31 Samsung Electronics Co., Ltd. Method and apparatus for relay discovery on sidelink in wireless communication system
WO2022067651A1 (fr) * 2020-09-30 2022-04-07 Lenovo (Beijing) Limited Procédés et appareils pour une procédure de resélection de relais et de gestion de transmission de données dans un scénario de relais ue-réseau

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021143464A1 (fr) * 2020-01-15 2021-07-22 大唐移动通信设备有限公司 Procédé et dispositif de sélection de dispositif de relais et support d'enregistrement informatique
EP4093091A1 (fr) * 2020-01-15 2022-11-23 Datang Mobile Communications Equipment Co., Ltd. Procédé et dispositif de sélection de dispositif de relais et support d'enregistrement informatique
US20220103997A1 (en) * 2020-09-29 2022-03-31 Samsung Electronics Co., Ltd. Method and apparatus for relay discovery on sidelink in wireless communication system
WO2022067651A1 (fr) * 2020-09-30 2022-04-07 Lenovo (Beijing) Limited Procédés et appareils pour une procédure de resélection de relais et de gestion de transmission de données dans un scénario de relais ue-réseau

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