WO2021109052A1 - Réduction de la complexité de la mobilité d'un équipement utilisateur avec assistance externe - Google Patents

Réduction de la complexité de la mobilité d'un équipement utilisateur avec assistance externe Download PDF

Info

Publication number
WO2021109052A1
WO2021109052A1 PCT/CN2019/123187 CN2019123187W WO2021109052A1 WO 2021109052 A1 WO2021109052 A1 WO 2021109052A1 CN 2019123187 W CN2019123187 W CN 2019123187W WO 2021109052 A1 WO2021109052 A1 WO 2021109052A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobility
base station
source
target
information
Prior art date
Application number
PCT/CN2019/123187
Other languages
English (en)
Inventor
Huilin Xu
Peter Pui Lok Ang
Yiqing Cao
Le LIU
Seyedkianoush HOSSEINI
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2019/123187 priority Critical patent/WO2021109052A1/fr
Publication of WO2021109052A1 publication Critical patent/WO2021109052A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports

Definitions

  • the following relates generally to wireless communications and more specifically to user equipment (UE) mobility complexity reduction with external assistance.
  • UE user equipment
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems.
  • 4G systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may be referred to as New Radio (NR) systems.
  • a wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • Some UEs e.g., low-cost UEs
  • the described techniques relate to improved methods, systems, devices, and apparatuses that support user equipment (UE) mobility complexity reduction with external assistance.
  • UE user equipment
  • the described techniques provide for reducing power consumption for low-cost UEs. Certain procedures, such as mobility procedures, may result in high power consumption.
  • a UE may increase its battery life if it obtains information, such as mobility information, from other UEs.
  • the low-cost UE may communicate with one or more standard UEs or low-cost UEs using sideband links.
  • the low-cost UE may receive mobility information over the sideband links.
  • the mobility information may include an indication of a mobility procedure performed by a standard UE, measurement information (e.g., radio resource management (RRM) measurements) , synchronization signal block (SSB) detection information, or the like.
  • the low-cost UE may decrease power consumption by performing a mobility procedure based on the mobility information.
  • a method of wireless communications at a mobility target UE may include tuning the mobility target UE to a first wireless channel associated with a first base station, receiving mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, selecting, based on the mobility information, a second base station as a target of a mobility procedure, and performing, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to tune the mobility target UE to a first wireless channel associated with a first base station, receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, select, based on the mobility information, a second base station as a target of a mobility procedure, and perform, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the apparatus may include means for tuning the mobility target UE to a first wireless channel associated with a first base station, receiving mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, selecting, based on the mobility information, a second base station as a target of a mobility procedure, and performing, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • a non-transitory computer-readable medium storing code for wireless communications at a mobility target UE is described.
  • the code may include instructions executable by a processor to tune the mobility target UE to a first wireless channel associated with a first base station, receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, select, based on the mobility information, a second base station as a target of a mobility procedure, and perform, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the mobility information includes an indication of the mobility procedure to tune the mobility source UE to the third wireless channel associated with the second base station, and where performing the mobility procedure to tune the mobility target UE to the third wireless channel may be based on the indication.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for monitoring for a set of broadcast messages from a set of UEs including the mobility source UE during a period of time, where receiving the mobility information from the mobility source UE includes receiving, based on the monitoring, the set of broadcast messages, and where a first broadcast message of the set of broadcast messages includes the mobility information from the mobility source UE, and selecting, based on receiving the set of broadcast messages, the mobility source UE from the set of UEs, where selecting the second base station as the target of the mobility procedure may be based on selecting the mobility source UE.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for randomly selecting the first broadcast message from the set of broadcast messages, where selecting the mobility source UE may be based on randomly selecting the first broadcast message.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that the first broadcast message of the set of broadcast messages arrived at the mobility target UE before a remainder of the set of broadcast messages, where selecting the mobility source UE may be based on the determining.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on the first broadcast message, an operational parameter associated with the mobility source UE, where selecting the mobility source UE may be based on the determining.
  • the operational parameter includes a transmit power for the mobility source UE, a receive power of the first broadcast message, a signal quality of the first broadcast message, or any combination thereof.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the first base station, an indication that the mobility source UE may be a preferred UE, where selecting the mobility source UE may be based on the indication.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on the set of broadcast messages, a respective mobility procedure performed by each UE of the set of UEs, where selecting the mobility source UE may be based on the determining.
  • the mobility source UE may have performed a one or more signal quality measurements on one or more downlink signals from the first base station, the second base station, or both.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a connection mode for the mobility source UE, a UE capability for the mobility source UE, or both, where receiving the mobility information may be based on the determining.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, over the sidelink connection, an indication of the connection mode for the mobility source UE, the UE capability for the mobility source UE, or both, where the determining may be based on the indication.
  • the mobility information includes one or more signal quality measurements performed by the mobility source UE on one or more downlink signals from the first base station, the second base station, or both, and where selecting the second base station as the target of the mobility procedure may be based on the received one or more signal quality measurements.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for performing the one or more signal quality measurements on one or more downlink signals received from the first base station, the second base station, or both, according to an extended periodicity based on receiving the one or more signal quality measurements performed by the mobility source UE.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the mobility source UE, synchronization information associated with the second base station, where performing the mobility procedure may be based on the synchronization information.
  • the mobility information includes one or more frequency locations associated with a synchronization signal block associated with the second base station, a numerology associated with a synchronization signal block associated with the second base station, timing information associated with a synchronization signal block associated with the second base station, a time domain pattern of a synchronization signal block associated with the second base station, a physical cell identifier associated with the second base station, a barred status of a third base station, or any combination thereof.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying a synchronization signal block associated with the second base station based on the mobility information, where selecting the second base station may be based on the synchronization signal block.
  • the mobility information may include operations, features, means, or instructions for refraining from selecting the third base station, where selecting the second base station may be based on the refraining.
  • performing the mobility procedure may include operations, features, means, or instructions for establishing a connection with the second base station, where the mobility target UE may be operating in a connected mode.
  • the mobility procedure may include operations, features, means, or instructions for selecting the second base station, where the mobility target UE may be not operating in a connected mode.
  • a method of wireless communications at a mobility source UE may include receiving one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both, performing, based on receiving the one or more downlink signals, one or more signal quality measurements, and transmitting, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both, perform, based on receiving the one or more downlink signals, one or more signal quality measurements, and transmit, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the apparatus may include means for receiving one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both, performing, based on receiving the one or more downlink signals, one or more signal quality measurements, and transmitting, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • a non-transitory computer-readable medium storing code for wireless communications at a mobility source UE is described.
  • the code may include instructions executable by a processor to receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both, perform, based on receiving the one or more downlink signals, one or more signal quality measurements, and transmit, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for performing a mobility procedure, where the mobility information includes an indication of the mobility procedure.
  • performing the mobility procedure may include operations, features, means, or instructions for tuning the mobility source UE to a third wireless channel associated with a second base station.
  • tuning the mobility source UE to the third wireless channel associated with the second base station further may include operations, features, means, or instructions for establishing a connection with the second base station, where the mobility target UE may be operating in a connected mode.
  • tuning the mobility source UE to the third wireless channel associated with the second base station further may include operations, features, means, or instructions for selecting the second base station, where the mobility target UE may be not operating in a connected mode.
  • transmitting the mobility information may include operations, features, means, or instructions for transmitting a broadcast message over the sidelink connection, the broadcast message including the mobility information.
  • the mobility information includes one or more signal quality measurements performed by the mobility source UE on one or more downlink signals from the first base station, the second base station, or both, and where selecting the second base station as a target of the mobility procedure may be based on the received one or more signal quality measurements.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for performing the one or more signal quality measurements according to a periodicity, where the mobility target UE performs the one or more signal quality measurements according to an extended periodicity.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, over the sidelink connection, an indication of a connection mode for the mobility source UE, a UE capability for the mobility source UE, or both.
  • Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the mobility target UE, synchronization information associated with the second base station.
  • the mobility information includes one or more frequency resources associated with a synchronization signal block associated with the second base station, a numerology associated with a synchronization signal block associated with the second base station, timing information associated with a synchronization signal block associated with the second base station, a time domain pattern of a synchronization signal block associated with the second base station, a physical cell identifier associated with the second base station, a barred status of a third base station, or any combination thereof.
  • FIG. 1 illustrates an example of a system for wireless communications that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • FIG. 2 illustrates an example of a wireless communications system that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates an example of a w that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • FIG. 4 illustrates an example of a process flow that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • FIGs. 5 and 6 show block diagrams of devices that support UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • FIG. 7 shows a block diagram of a communications manager that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • FIG. 8 shows a diagram of a system including a device that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • FIGs. 9 through 14 show flowcharts illustrating methods that support UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • a base station may communicate with one or more user equipments (UEs) .
  • Some UEs e.g., low-cost UEs
  • Some UEs may be, in some examples, smaller than standard UEs, and may have smaller batteries, resulting in a shorter battery life.
  • a user may not be able or willing to recharge a low-cost UE to maintain a fully charged battery. For instance, a user may not want to remove a smart watch, or other wearable low-cost UE, every night to charge) .
  • the battery of a low-cost UE such as a wireless sensor, may be difficult to replace. In such cases, it may be beneficial to extend the battery life of the low-cost UE by reducing power consumption. Limiting the functionality of the low-cost UE may be one way to reduce power consumption.
  • Some procedures may result in high power consumption for a low-cost UE.
  • the low-cost UE may be mobile.
  • Mobile UEs including low-cost UEs, may perform one or more mobility procedures (e.g., performing a handover procedure in a connected mode, or a cell reselection procedure to camp on a target base station in a non-connected mode) .
  • mobility procedures may drain the battery of the low-cost UE.
  • the low-cost UE may utilize mobility information from other UEs (e.g., standard UEs, low-cost UEs, or the like) to decrease power expenditures.
  • a low-cost UE may communicate with other UEs via one or more sideband links.
  • the low-cost UE may receive mobility information from other UEs via the one or more sideband links.
  • the low-cost UE may receive the mobility information via a dedicated message from another UE (e.g., via device-to device or point-to-point communication) over a sideband link or may receive broadcast messages from one or more UEs via one or more sideband links.
  • the mobility information may include an indication of a mobility procedure performed by another UE, which the low-cost UE may follow (e.g., the low-cost UE may perform the same mobility procedure as the UE transmitting the mobility information) .
  • the mobility information may include measurement information, such as radio resource management (RRM) measurements, or synchronization signal block (SSB) detection information.
  • RRM radio resource management
  • SSB synchronization signal block
  • the low-cost UE may utilize the received measurement information to assist in performing a mobility procedure, determining whether to perform a mobility procedure, etc.
  • the low-cost UE may save power by refraining from performing its own RRM measurements or may quickly locate a relevant SSB.
  • aspects of the disclosure are initially described in the context of a wireless communications system. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to random access signaling.
  • FIG. 1 illustrates an example of a wireless communications system 100 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130.
  • the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • LTE-A Pro LTE-A Pro
  • NR New Radio
  • the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.
  • ultra-reliable e.g., mission critical
  • the base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities.
  • the base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125.
  • Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125.
  • the coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.
  • the UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times.
  • the UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1.
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.
  • network equipment e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment
  • the base stations 105 may communicate with the core network 130, or with one another, or both.
  • the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface) .
  • the base stations 105 may communicate with one another over the backhaul links 120 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) , or indirectly (e.g., via core network 130) , or both.
  • the backhaul links 120 may be or include one or more wireless links.
  • One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.
  • a base transceiver station a radio base station
  • an access point a radio transceiver
  • a NodeB an eNodeB (eNB)
  • eNB eNodeB
  • a next-generation NodeB or a giga-NodeB either of which may be referred to as a gNB
  • gNB giga-NodeB
  • a UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples.
  • a UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a multimedia/entertainment device (e.g., a radio, a MP3 player, a video device, etc.
  • PDA personal digital assistant
  • a camera e.g., a gaming device, a navigation/positioning device (e.g., GNSS (global navigation satellite system) devices based on, for example, GPS (global positioning system) , Beidou, GLONASS, or Galileo, a terrestrial-based device, etc.
  • GNSS global navigation satellite system
  • GPS global positioning system
  • Beidou Beidou
  • GLONASS Galileo
  • a terrestrial-based device etc.
  • a tablet computer a laptop computer, a netbook, a smartbook, a personal computer
  • a smart device a wearable device (e.g., a smart watch, smart clothing, smart glasses, virtual reality goggles, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet) )
  • a drone a robot/robotic device, a vehicle, a vehicular device, a meter (e.g., parking meter, electric meter, gas meter, water meter) , a monitor, a gas pump, an appliance (e.g., kitchen appliance, washing machine, dryer) , a location tag, a medical/healthcare device, an implant, a sensor/actuator, a display, or any other suitable device configured to communicate via a wireless or wired medium, or a personal computer.
  • a wearable device e.g., a smart watch, smart clothing, smart glasses, virtual reality goggles, a smart wristband, smart jewelry (e.g
  • a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.
  • WLL wireless local loop
  • IoT Internet of Things
  • IoE Internet of Everything
  • MTC machine type communications
  • the UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • devices such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.
  • the UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers.
  • the term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125.
  • a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) .
  • BWP bandwidth part
  • Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling.
  • the wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation.
  • a UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration.
  • Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) .
  • MCM multi-carrier modulation
  • OFDM orthogonal frequency division multiplexing
  • DFT-S-OFDM discrete Fourier transform spread OFDM
  • a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related.
  • the number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) .
  • a wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.
  • One or more numerologies for a carrier may be supported, where a numerology may include a subcarrier spacing ( ⁇ f) and a cyclic prefix.
  • a carrier may be divided into one or more BWPs having the same or different numerologies.
  • a UE 115 may be configured with multiple BWPs.
  • a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.
  • Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) .
  • Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .
  • SFN system frame number
  • Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration.
  • a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots.
  • each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing.
  • Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) .
  • a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
  • a subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) .
  • TTI duration e.g., the number of symbol periods in a TTI
  • the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • a control region e.g., a control resource set (CORESET)
  • CORESET control resource set
  • a control region for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier.
  • One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115.
  • one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner.
  • An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size.
  • Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.
  • Each base station 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof.
  • the term “cell” may refer to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) .
  • a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates.
  • Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105.
  • a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell.
  • a small cell may be associated with a lower-powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells.
  • Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) .
  • a base station 105 may support one or multiple cells and may also support communications over the one or more cells using one or multiple component carriers.
  • a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.
  • protocol types e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB)
  • NB-IoT narrowband IoT
  • eMBB enhanced mobile broadband
  • a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110.
  • different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105.
  • the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105.
  • the wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.
  • Some UEs 115 may be low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication) .
  • M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention.
  • M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that makes use of the information or presents the information to humans interacting with the application program.
  • Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices.
  • MTC or IoT UEs may include MTC/enhanced MTC (eMTC, also referred to as CAT-M, Cat M1) UEs, NB-IoT (also referred to as CAT NB1) UEs, as well as other types of UEs.
  • eMTC and NB-IoT may refer to future technologies that may evolve from or may be based on these technologies.
  • eMTC may include FeMTC (further eMTC) , eFeMTC (enhanced further eMTC) , mMTC (massive MTC) , etc.
  • NB-IoT may include eNB-IoT (enhanced NB-IoT) , FeNB-IoT (further enhanced NB-IoT) , etc.
  • Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) .
  • half-duplex communications may be performed at a reduced peak rate.
  • Other power conservation techniques for the UEs 115 include entering a power saving deep sleep mode when not engaging in active communications, operating over a limited bandwidth (e.g., according to narrowband communications) , or a combination of these techniques.
  • some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.
  • a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.
  • the wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof.
  • the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications.
  • the UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) .
  • Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) .
  • MCPTT mission critical push-to-talk
  • MCVideo mission critical video
  • MCData mission critical data
  • Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications.
  • the terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.
  • a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 125 (e.g., using a peer-to-peer (P2P) or D2D protocol) .
  • D2D device-to-device
  • P2P peer-to-peer
  • One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
  • Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105.
  • groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group.
  • a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.
  • the D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115) .
  • vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these.
  • V2X vehicle-to-everything
  • V2V vehicle-to-vehicle
  • a vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system.
  • vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., base stations 105) using vehicle-to-network (V2N) communications, or with both.
  • V2N vehicle-to-network
  • the core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • the core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management function
  • S-GW serving gateway
  • PDN Packet Data Network gateway
  • UPF user plane function
  • the control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130.
  • NAS non-access stratum
  • User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions.
  • the user plane entity may be connected to the network operators IP services 150.
  • the operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.
  • Some of the network devices may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) .
  • Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) .
  • Each access network transmission entity 145 may include one or more antenna panels.
  • various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .
  • the wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) .
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors.
  • the transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • the wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands.
  • the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • LAA License Assisted Access
  • LTE-U LTE-Unlicensed
  • NR NR technology
  • an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band.
  • devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance.
  • operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) .
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
  • a base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming.
  • the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .
  • a base station 105 or a UE 115 may use beam sweeping techniques as part of beam forming operations.
  • a base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115.
  • Some signals e.g., synchronization signals, reference signals, beam selection signals, or other control signals
  • the base station 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission.
  • Transmissions in different beam directions may be used to identify (e.g., by a transmitting device, such as a base station 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the base station 105.
  • a transmitting device such as a base station 105
  • a receiving device such as a UE 115
  • Some signals may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) .
  • the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted in one or more beam directions.
  • a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions and may report to the base station 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.
  • transmissions by a device may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from a base station 105 to a UE 115) .
  • the UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more sub-bands.
  • the base station 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded.
  • a reference signal e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS)
  • CRS cell-specific reference signal
  • CSI-RS channel state information reference signal
  • the UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) .
  • PMI precoding matrix indicator
  • codebook-based feedback e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook
  • a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .
  • a receiving device may try multiple receive configurations (e.g., directional listening) when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals.
  • receive configurations e.g., directional listening
  • a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions.
  • receive beamforming weight sets e.g., different directional listening weight sets
  • a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) .
  • the single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .
  • SNR signal-to-noise ratio
  • a base station 105 may communicate with a low-cost UE 135 that may operate with limited functionality when compared with a UE 115.
  • UE 115 may be a standard UE such as a cell phone, laptop, or tablet.
  • Low-cost UE 135 may be referred to as a low-cost UE and may have a lower complexity and lower power consumption than UE 115.
  • low-cost UE 135 is depicted as a smart watch, low-cost UE 135 may be another device or sensor.
  • low-cost UE 135 may be a wireless sensor such as a pressure sensor, humidity sensor, thermometer, motion sensor, accelerometer, or the like.
  • low-cost UE 135 may be a wearable device such as a smart watch, ring, eHealth related device, a medical monitoring device, or the like.
  • Low-cost UE 135 may be any device smaller in size with a lower battery capacity than a standard UE 115.
  • the lower complexity and power consumption of low-cost UE 135 may result from reducing the operation bandwidth, antenna number, transmission power, data rate, or a combination thereof.
  • Low-cost UE 135 may not support features with high processing complexity and power consumption, such as ultra-low latency communication.
  • Low-cost UE 135 may use external assistance from other UEs 115 based on device-to-device communication or broadcast messages from one or more UEs 115 or low-cost UEs 135-a.
  • low-cost UE 135 may establish device-to-device communication or transmit and receive broadcast messages via one or more sideband links with one or more UEs 115 or low-cost UEs 135. To conserve battery power, low-cost UE 135 may receive information, such as mobility information, from other UEs 115 or low-cost UEs 135 via the sideband links.
  • the mobility information may include an indication of a mobility procedure performed by the transmitting device, measurement information, such as RRM measurements or SSB detection information.
  • Low-cost UE 135 may evaluate the mobility information and may follow a mobility procedure performed by another device, perform RRM measurements less frequently, select a new target base station 105 based on the mobility information, or the like.
  • the described techniques may support decreased power expenditure, improved battery life for low-cost UEs, and improved user experience.
  • supported techniques may include improved network operations and, in some examples, may promote device efficiencies and extended battery life, among other benefits.
  • FIG. 2 illustrates an example of a wireless communications system 200 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • wireless communications system 200 may implement aspects of wireless communications system 100.
  • wireless communications system 200 may include a base station 105-a, a low-cost UE 135-a, and UE 115-a, which may be examples of the corresponding devices described with reference to FIG. 1.
  • Wireless communications system 200 may include features for low-cost UE 135 mobility complexity reduction resulting in lower power consumption, among other benefits.
  • base station 105-a may serve one or more UEs 115 and low-cost UEs 135 located within a geographic coverage area 110-a.
  • a UE 115 e.g., UE 115-a
  • Low-cost UEs 135 may operate at a lower complexity and may expend less power than UEs 115.
  • low-cost UE 135-a may be a wireless sensor such as a pressure sensor, humidity sensor, thermometer, motion sensor, accelerometer, or the like.
  • low-cost UE 135-a may be a wearable device such as a smart watch, smart ring, eHealth related device, medical monitoring device, or the like. Low-cost UE 135-a may be smaller in size with a lower battery capacity than a standard UE 115. To reduce device or computational complexity and power consumption, low-cost UE 135-a may reduce its operation bandwidth, reduce a number of antennas, reduce its transmission power, reduce its data rate, or any combination thereof. Low-cost UE 135-a may not support features with high processing complexity and power consumption, such as ultra-low latency communication. To reduce power consumption, low-cost UE 135-a may rely on external assistance from other UEs 115 to perform mobility procedures.
  • UE 115-a and low-cost UE 135-a within geographic coverage area 110-a may communicate with a base station 105-a, and with each other.
  • Low-cost UE 135-a and UE 115-a may communicate with base station 105-a via bidirectional communication link 210-a and 210-b, respectively.
  • Low-cost UE 135-a and UE 115-a may operate in a connected mode, or may not operate in a connected mode.
  • low-cost UE 135-a, UE 115-a, or both may perform a handshake procedure (e.g., a random access procedure) and may exchange one or more uplink and downlink messages (e.g., RRC messages) via bidirectional communication links 210-a and 210-b respectively.
  • bidirectional communication links 210-a and 210-b may be cellular air interface links (e.g., Uu interface links) .
  • low-cost UE 135-a and UE 115-a may camp on a cell corresponding to base station 105-a and may monitor for downlink information (e.g., reference signals, synchronization signals, control information, or the like) on bidirectional communication links 210-a and 210-b.
  • downlink information e.g., reference signals, synchronization signals, control information, or the like
  • Low-cost UE 135-a and UE 115-a may also be capable of communicating with each other (e.g., using various wireless communication protocols such as Bluetooth, Wi-Fi, NR sideband link, or the like) .
  • a low-cost UE 135 may communicate with UEs 115 or other low-cost UEs 135 using one or more sideband links 215.
  • low-cost UE 135-a may communicate with UE 115-a via sideband link 215-a.
  • low-cost UE 135-a may maintain both bidirectional communication link 210-a and sideband link 215-a.
  • Low-cost UE 135-a may utilize bidirectional communication link 210-a and sideband link 215-a to decrease power consumption (e.g., by receiving information via sideband link 215-a) , extend its coverage area (e.g., by communicating with base station 105-a via bidirectional communication link 210-a) , increase channel throughput to the network (e.g., by communicating with base station 105-a directly via bidirectional communication link 210-a and indirectly through UE 15-a via sideband link 215-a) , or the like.
  • procedures such as mobility procedures (e.g., which may be referred to as mobility operations) may result in high power consumption for low-cost UE 135-a.
  • Both low-cost UE 135-a and UE 115-a may periodically measure signal quality from a list of candidate base stations 105, which may be referred to as a RRM measurement.
  • Low-cost UE-135-a or UE 115-a may determine signal quality for a candidate cell by receiving one or more downlink signals (e.g., reference signals) from a base station 105 (not shown) and may determine, for the received downlink signal, a reference signal received power (RSRP) , reference signal received quality (RSRQ) , received signal strength indicator (RSSI) , signal interference and noise ratio (SINR) , or the like.
  • Low-cost UE 135-a and UE 115-a may evaluate the signal quality, and determine an event (e.g., a mobility procedure) based on triggering conditions (e.g., a threshold level of signal quality degradation has occurred) .
  • an event e.g., a mobility procedure
  • triggering conditions e.g., a threshold level of signal quality degradation has occurred
  • low-cost UE 135 may determine that the quality of the downlink signal from base station 105-a is unacceptable, and that the signal quality of another base station 105 is acceptable. In such cases, low-cost UE 135-a, UE 115-a, or both, may perform a mobility procedure, which may differ depending on the mode of each device. For example, low-cost UE 135-a or UE 115-a may be in a connected mode, in which case low-cost UE 135-a or UE 115-a may report the event to the network. Low-cost UE 135-a or UE 115-a may wait for a command from base station 105-a before switching to a target base station 105 in a handover procedure.
  • low-cost UE 135-a or UE 115-a may not operate in a connected mode, in which case low-cost UE 135-a or UE 115-a may autonomously switch to a target base station 105 in a base station 105 reselection procedure.
  • both UE 115-a and low-cost UE 135-a may be able to perform handover procedures while in a connected mode and cell reselection procedures when in a non-connected mode based on measuring signal quality.
  • mobility procedures may be costly with respect to power expenditures for low-cost UE 135-a.
  • low-cost UE 135-a may receive information, such as mobility information, from other UEs 115 or low-cost UEs 135 (e.g., UE 115-a, another low- cost UE 135, or the like) via sideband link 215-a, and may rely on the received mobility information (e.g., instead of performing its own complete RRM measurements and determining a mobility procedure based thereon) .
  • a UE 115-a or another low-cost UE 135 that transmits mobility information may be referred to as a mobility source UE, and a low-cost UE 135-a that receives and uses mobility information to perform a mobility procedure may be referred to as a mobility target UE.
  • the mobility information may include an indication of a mobility procedure performed by UE 115-a or a low-cost UE 135.
  • low-cost UE 135-a may elect to perform the same mobility procedure (e.g., without expending power by performing RRM measurements) .
  • the mobility information may include RRM measurements.
  • low-cost UE 135-a may reduce its amount of RRM measurements or frequency of RRM measurements, and may instead rely on the RRM measurements received from UE 115-a.
  • the mobility information may include SSB detection information.
  • the SSB detection information may include one or more frequency resources associated with an SSB, a numerology associated with an SSB, timing information associated with an SSB, a time domain pattern of an SSB, a physical cell identifier associated with a base station 105, a barred status of a base station 105, or any combination thereof.
  • Low-cost UE 135-a may use the SSB detection information to locate the SSB transmitted by a target base station 105, and may perform a mobility procedure based thereon, or may synchronize with a target base station 105 after a mobility procedure based thereon.
  • Low-cost UE 135 may monitor for, and receive, mobility information from UEs 115 or low-cost UEs 135 via one or more sideband links 215.
  • low-cost UE 135-a may perform device-to-device communication with UE 115-a using sideband link 215-a.
  • low-cost UE 135-a may receive one or more dedicated messages including mobility information.
  • low-cost UE 135-a may receive multiple broadcast messages from one or more UEs 115 or low-cost UEs 135, or both, via one or more sideband links 215, as described in greater detail with respect to FIG. 3.
  • FIG. 3 illustrates an example of a wireless communications system 300 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • wireless communications system 300 may implement aspects of wireless communications systems 100 and 200.
  • wireless communications system 300 may include base stations 105, UEs 115, and low-cost UEs 135, which may be examples of the corresponding devices described with reference to FIGs. 1 and 2.
  • Wireless communications system 300 may include bidirectional communication links 310 and sideband links 315, which may have similar features and functionality as the corresponding links described with reference to FIGs. 1 and 2.
  • Wireless communications system 300 may include features for low-cost UE 135 mobility complexity reduction resulting in lower power consumption, among other benefits.
  • base station 105-b may serve UE 115-b and low-cost UEs 135-b and 135-c located within a geographic coverage area 110-b using bidirectional communication links 310-a, 310-b, and 310-c, respectively.
  • base station 105-c may serve, or may be capable of serving, UE 115-c and low-cost UE 135-c located within a geographic coverage area 110-c using bidirectional communication links 310-d and 310-e.
  • UEs 115 may be standard UEs, such as cell phones, laptops, or tablets.
  • Low-cost UEs 135 may operate at a lower complexity and may be capable of or restricted to operating at a lower power consumption than standard UEs 115. In some examples, low-cost UEs 135 may be examples of wireless sensors or a wearable device. A low-cost UE 135 may save power by relying on external assistance from other UEs 115 or low-cost UEs 135 to perform mobility procedures based on device-to-device (e.g., point-to-point) communication or broadcast messages from one or more UEs 115 or low-cost UEs 135.
  • device-to-device e.g., point-to-point
  • Low-cost UEs 135 may maintain one or more bidirectional communication links 310 with base stations 105, and one or more sideband links 315 with other UEs.
  • low-cost UE 135-b may maintain bidirectional communication link 310-b and sideband links 315-a, 315-b, or 315-c with UE 115-b, low-cost UE 135-c, or UE 115-c, respectively.
  • Communications on sideband links 315 may be bidirectional or unidirectional.
  • low-cost UE 135-b may transmit dedicated messages (e.g., device-to-device messages) to UE 115-b, low-cost UE 135-c, or UE 115-c and may receive dedicated messages (e.g., device-to-device messages) over bidirectional sideband links 315-a, 315-b, or 315-c.
  • Low-cost UE 135-b may receive one or more broadcast messages from UE 115-b, low-cost UE 135-c, or UE 115-c over sideband links 315-a, 315-b, or 315-c.
  • a low-cost UE 135 may perform a mobility procedure. Mobility procedures may differ depending on the mode of a UE 115 or low-cost UE 135. Low-cost UE 135-b may perform a handover procedure in a connected mode and a cell reselection procedure to target base-station 105 when not in a connected mode, as described in greater detail with respect to FIG. 2. In both examples of mobility procedures, a UE 115 or low-cost UE 135 may select a target base station 105, and may retune one or more antennas to monitor for downlink signaling from the selected base station 105.
  • a low-cost UE 135 or UE 115 may periodically perform RRM measurements on downlink signals received from one or more base stations 105 (e.g., on bidirectional communication links 310) , detect an SSB for the target base station 105, or a combination thereof.
  • RRM measurements and SSB detection may be similar for UEs 115 or low-cost UEs 135 in a similar geographic area.
  • mobility procedures may result in a high power expenditure for a low-cost UE 135 (e.g., low-cost UE 135-b) .
  • low-cost UE 135-b may utilize mobility information received from another device (e.g., UE 115-c) to determine whether to perform a mobility procedure. For instance, a user may carry UE 115-c and may wear low-cost UE 135-b.
  • UE 115-c may communicate with base station 105-c using bidirectional communication link 310-d.
  • UE 115-c may camp on base station 105-c and monitor for downlink messages using bidirectional communication link 310-d.
  • a connection with base station 105-c may degrade as UE 115-c changes its location.
  • UE 115-c may identify this degradation of the link by performing signal quality measurements on one or more downlink signals from base station 105-c. If not in a connected mode, UE 115-c may reselect base station 105-b as a target cell and camp on the target cell. In a connected mode, UE 115-c may perform a handover procedure and establish a connection with base station 105-b.
  • Low-cost UE 135-b may be geographically located in close proximity with UE 115-c (e.g., worn by the same user) , and may thus experience similar link degradation with base station 105-c. However, as described herein, performing RRM measurements to determine a target base station 105 for a mobility procedure may result in high power expenditure for low-cost UE 135-b. Instead, low-cost UE 135-b may rely on information (e.g., mobility information) from other UEs 115 or low-cost UEs 135 (e.g., UE 115-c) to perform mobility procedures.
  • information e.g., mobility information
  • a low-cost UE 135 may directly communicate (e.g., via device-to-device communication) with a UE 115 or low-cost UE 135 using a sideband link 315.
  • low-cost UE 135-b may receive dedicated device-to-device messages from UE 115-c via sideband link 315-c.
  • a dedicated message may include mobility information.
  • the mobility information may indicate a mobility procedure performed by the transmitting device. For example, if UE 115-c is operating in a connected mode, and performs a handover procedure to establish a connection with base station 105-b, then the mobility information may include an indication of the mobility procedure performed by UE 115-c.
  • Low-cost UE 135-b may receive the mobility information from UE 115-c and decide to follow UE 115-c in the mobility procedure. That is, low-cost UE 135-b may perform the same mobility procedure (e.g., the handover or cell reselection procedure) , and may establish a connection with base station 105-b or camp on the base station 105-b.
  • the mobility information received on a dedicated device-to-device message may include RRM measurements or SSB detection information that may allow low-cost UE 135-b to switch to the same target base station 105-c as UE 115-c, or to perform a different mobility procedure, as described in greater detail herein
  • a low-cost UE 135 may receive one or more broadcast messages from surrounding low-cost UEs 135 or standard UEs 115.
  • low-cost UE 135-b may receive one or more broadcast messages from UE 115-b, low-cost UE 135-c, or UE 115-c over sideband links 315-a, 315-b, or 315-c, respectively.
  • Each received broadcast message may include mobility information from the transmitting UE 115 or low-cost UE 135.
  • Low-cost UE 135-b may select a UE 115 or low-cost UE 135 that has transmitted a broadcast message, and low-cost UE 135-b may perform a mobility procedure based on the mobility information provided by the selected UE 115 or low-cost UE 135.
  • each of the broadcast messages may include mobility information indicating a mobility procedure performed by the respective transmitting device.
  • UE 115-b may perform the same mobility procedure indicated in the mobility information.
  • each broadcast messages may include mobility information indication RRM measurements performed by the respective transmitting devices, information related to the location (e.g., time-frequency resources) of an SSB of a target base station 105 (e.g., base station 105-b) , or the like.
  • low-cost UE 135-b may utilize the mobility information to determine whether or when to perform a mobility procedure (e.g., without expending the power of a full RRM procedure) .
  • a transmitting device e.g., a mobility source UE 115
  • low-cost UE 135-b may monitor for broadcast messages on one or more sideband link 315 for a period of time. The amount of time may be preconfigured, or configured by a base station 105, or dynamically determined by low-cost UE 135-b.
  • Low-cost UE 135-b may then receive, during the time period, multiple broadcast messages, and may select one of the transmitting devices on which to rely based on one or more parameters, rules, or measurements, as described below.
  • low-cost UE 135-b may receive broadcast messages from UE 115-b, low-cost UE 135-c, and UE 115-c, and may randomly select any of UE 115-b, low-cost UE 135-c, or UE 115-c (e.g., as a mobility source UE on which low-cost UE 135-b can rely for mobility information) .
  • Low-cost UE 135-b may receive mobility information from UE 115-b, low-cost UE 135-c, and UE 115-c over sideband links 315-a, 315-b, and 315-c, respectively.
  • Low-cost UE 135-b may randomly select a UE 115 or low-cost UE 135 that sent the broadcast messages, and may use the mobility information from that device to perform a mobility procedure.
  • low-cost UE 135-b may identify one or more parameters, and select a UE 115 or low-cost UE 135 as a mobility source UE based thereon.
  • Low-cost UE 135-b may select a UE 115 or low-cost UE 135 based on one or more priority rules (e.g., as configured by a base station 105) or device identifiers.
  • low-cost UE 135-b may determine a device identifier for each of UE 115-b, low-cost UE 135-c, and UE 115-c, and may compare the device identifiers.
  • low-cost UE 135-b may apply one or more priority rules to the device identifiers based on the comparison. For instance, low-cost UE 135-b may select the device having the lowest device identifier value, or the highest, or may randomly select one of the device identifiers.
  • the one or more priority rules may be indicated by a base station 105, preconfigured, indicated in a standards document, or the like.
  • low-cost UE 135-b may perform the same mobility procedure performed by the transmitting device based on the mobility information or may reduce power expenditures by using indicated mobility information (e.g., RRM measurements, SSB detection information, or a combination thereof) .
  • indicated mobility information e.g., RRM measurements, SSB detection information, or a combination thereof
  • low-cost UE 135-b may select a UE 115 or low-cost UE 135 based on the order in which low-cost UE 135-b receives mobility information.
  • Low-cost UE 135-b may choose to follow a UE 115 or low-cost UE 135, or rely on mobility information (e.g., measurement information) received from that UE 115 or low-cost UE 135, based at least in part on receiving mobility information from that UE 115 or low-cost UE prior to receiving mobility information from other devices.
  • mobility information e.g., measurement information
  • low-cost UE 135-b may receive mobility information from UE 115-b, low-cost UE 135-c, and UE 115-c.
  • the mobility information from UE 115-c may reach low-cost UE 135-b first (e.g., because UE 115-c is closer to low-cost UE 135-b than low-cost UE 135-c and UE 115-b, or based on channel conditions, or based on an order of transmissions with respect to time, or the like) .
  • Low-cost UE 135-b may follow UE 115-c, or rely on mobility information received from UE 115-c, based on receiving mobility information from UE 115-c before receiving mobility information from UE 115-b or low-cost UE 135-c.
  • low-cost UE 135-b may select a UE 115 or low-cost UE 135 based at least in part on one or more measurements or criteria (e.g., power corresponding to received signals) .
  • low-cost UE 135-b may receive broadcast messages including mobility information from UE 115-b, low-cost UE 135-c, and UE 115-c over sideband links 315-a, 315-b, and 315-c, respectively.
  • Low-cost UE 135-b may determine a signal strength or power metric for each received mobility information message (e.g., may determine a transmit power, receive power, or the like) .
  • Low-cost UE 135-b may determine that the signal power of the message from UE 115-b over sideband link 315-a is higher than the signal power of the message received from UE 115-c or low-cost UE 135-c. Thus, low-cost UE 135-b may follow UE 115-b or may rely on the mobility information received from UE 115-b to perform a mobility procedure.
  • a cellular network may configure a specific UE 115 or low-cost UE 135 for a low-cost UE 135 to follow in a mobility procedure.
  • base station 105-b may configure (e.g., via bidirectional communication link 310-b) low-cost UE 135-b with information regarding a designated UE 115.
  • low-cost UE 135-b may determine that, for example, UE 115-c is designated as a mobility source UE 115.
  • Low-cost UE 135-b may receive mobility information from UE 115-b, low-cost UE 135-c, and UE 115-c over sideband links 315-a, 315-b, and 315-c, respectively.
  • low-cost UE 135-b may select UE 115-b and rely on the mobility information received form UE 115-b to perform a mobility procedure.
  • the base station 105-b may configure (e.g., via bidirectional communication link 310-b) low-cost UE 135-b with information regarding a list of prioritized designated UEs 115.
  • low-cost UE 135-b may select UE 115-c based on the configuration information.
  • base station 105-b may determine various relationships between UEs 115 and low-cost UEs 135, and may configure designated mobility source UEs 115 based on the determined relationships.
  • base station 105-b may determine that UE 115-c and low-cost UE 135-b are generally in close proximity (e.g., are worn or carried by the same user) , but that UE 115-b is only temporarily located in close proximity to low-cost UE 135-b (e.g., is carried by a different user) . In such examples, base station 105-b may designate UE 115-c as the designated mobility source UE 115.
  • low-cost UE 135-b may receive multiple messages containing mobility information from UEs 115 or low-cost UEs 135 and may select one of the low-cost UEs 135 or low-cost UEs 135 based on analyzing the messages. For example, low-cost UE 135-b may receive mobility information from UE 115-b, low-cost UE 135-c, and UE 115-c over sideband links 315-a, 315-b, and 315-c, respectively. Low-cost UE 135-b may evaluate one or more of the messages and determine to follow a UE 115 or low-cost UE 135 based at least in part on evaluating the messages.
  • low-cost UE 135-b may determine that both UE 115-c and low-cost UE 135-c have moved into coverage area 110-c, towards base station 105-c, and that UE 115-b has stayed in coverage area 110-b.
  • Low-cost UE 135-b may choose either low-cost UE 135-c or UE 115-c to follow or may rely on the mobility information received from low-cost UE 135-c or UE 115-c, based at least in part on the number of mobility information messages, the amount of UEs 115 or low-cost UEs 135 that have performed a mobility procedure, one or more RRM measurements performed based on the mobility information, or the like.
  • a low-cost UE 135 may select a low-cost UE 135 or UE 115 based on a category or capability of the transmitting devices. For example, low-cost UE 135-b may select a UE 115 or low-cost UE 135 that performs RRM measurements for a mobility procedure by itself (e.g., a standard UE 115 that performs its own RRM measurements, instead of relying on external assistance from another UE 115) . In some cases, the mobility information from a low-cost UE 135 may be less accurate or less complete than mobility information from a standard UE 115.
  • low-cost UE 135-b may select a second UE 115 on which to rely for mobility information (e.g., UE 115-b and UE 115-c) and may ignore mobility information received from other low-cost UEs 135 (e.g., low-cost UE 135-c) .
  • the low-cost UE 135 may choose a second UE 115 that supports certain capabilities (e.g., completes mobility procedures without assistance) .
  • low-cost UE 135-b may receive mobility information from UE 115-b, low-cost UE 135-c, and UE 115-c over sideband links 315-a, 315-b, and 315-c, respectively.
  • Low-cost UE 135-b may ignore the mobility information from low-cost UE 135-c and select UE 115-c to follow based on one of the above examples or a combination of the above examples.
  • the mobility information may include an indication of its UE category (e.g., standard UE 115 or low-cost UE 135) , or its capability (e.g., capable of performing RRM measurements) , or the like.
  • Low-cost UE 135-b may determine that low-cost UE 135-c is another low-cost UE 135 based on the mobility information, and may ignore the mobility information included in the broadcast message, subsequent broadcasts from low-cost UE 135-c, or a combination thereof.
  • UEs 115 and low-cost UEs 135 may send category or capability information via dedicated messages on an established sidelink connection (e.g., via a sideband link 315) .
  • a low-cost UE 135 may select a second UE 115 or low-cost UE 135 to follow based on an operating mode of the transmitting devices. For example, low-cost UE 135-b may be in a connected mode, and therefore determine to follow only UEs 115 or low-cost UEs 135 that are also in a connected mode. Low-cost UE 135 may not be in a connected mode, and may determine to follow only UEs 115 or low-cost UEs 135 that are in a non-connected mode.
  • low-cost UE 135-b may be in a connected mode, and may receive mobility information from UE 115-b, low-cost UE 135-c, and UE 115-c over sideband links 315-a, 315-b, and 315-c.
  • UE 115-b may camp on base station 105-b in a non-connected mode, and low-cost UE 135-c and UE 115-c may operate in a connected mode.
  • low-cost UE 135-b may only consider mobility information from low-cost UE 135-c and UE 115-c.
  • low-cost UE 135-b may provide mobility information to other devices.
  • low-cost UE 135-b may perform one or more of the techniques described herein, and may receive mobility information from UE 115-c.
  • low-cost UE 135-b may transmit some or all of the mobility information to low-cost UE 135-c.
  • low-cost UE 135-b may transmit the mobility information using a dedicated message over an established connection on sideband link 315-b, or using a broadcast message on sideband link 315.
  • Low-cost UE 135-c may receive the mobility information from low-cost UE 135-b, and may perform a mobility procedure based thereon.
  • a low-cost UE 135 may make its own measurements to determine whether to perform a mobility procedure, and may supplement its own measurements based on mobility information received from another device (e.g., a mobility source device) .
  • low-cost UE 135-b may use any combination of the above described techniques for selecting a UE 115 or low-cost UE 135 to rely on for mobility procedures.
  • the low-cost UE 135 may measure one or more downlink signals, and may monitor a low-cost UE 135 or UE 115 for mobility information.
  • low-cost UE 135 may operate independent of the second low-cost UE 135 or UE 115 in mobility procedures.
  • a low-cost UE 135 may receive mobility information including measurement information, and may reduce its own power expenditures due to measurements based thereon.
  • low-cost UE 135-b may receive RRM measurement information from UE 115-c.
  • the RRM measurement information may include measurements made by UE 115-c on one more downlink signals from base station 105-c.
  • the measurement information may provide information regarding environmental conditions, channel conditions, or the like, for surrounding UEs 115 or low-cost UEs 135.
  • the measurements may be quantized to finite levels.
  • Low-cost UE 135-b may use this quantized measurement information to reduce the amount of power expended on its own measurements, and may partially or completely rely on the received mobility information.
  • low-cost UE 135-b may perform a modified measurement to obtain any additional information not clear or not included in the mobility information. Such modified measurements may expend less power than standard or complete RRM measurements.
  • a low-cost UE 135 may adjust the frequency or periodicity at which it performs RRM measurements, based on the mobility information. For example, mobility information received from one or more UEs 115 or low-cost UEs 135 may include partial or complete RRM measurements. Low-cost UE 135-b may reduce RRM measurement frequency of occurrence by relying on the RRM measurement information included in the mobility information. Low-cost UE 135-b may then perform its own environmental measurements at an extended periodicity. Thus, low-cost UE 135-b may reduce power consumption by performing fewer RRM measurements.
  • low-cost UEs 135 may receive assistance from the other UEs 115 or low-cost UEs 135 to detect a target base station 105.
  • low-cost UE 135-b may identify base station 105-b as a target base station 105 as part of a mobility procedure.
  • low-cost UE 135-b may expend a large amount of power acquiring an SSB block corresponding to base station 105-b.
  • low-cost UE 135-b may communicate with UE 115-c over sideband link 315-c.
  • UE 115-c may perform a mobility procedure and switch from base station 105-c to 105-b.
  • UE 115-c may rely on SSB detection information to detect the target base station 105-b.
  • Low-cost UE 135-c may use the same SSB as UE 115-c in a mobility procedure.
  • UE 115-c may send mobility information, including SSB detection information, to low-cost UE 135-b.
  • the SSB detection information may allow low-cost UE 135-b to achieve downlink time and frequency synchronization with target base station 105-b with decreased power consumption.
  • the SSB detection information may include a location of the SSB corresponding to base station 105-b.
  • the mobility information may include SSB detection information for a target base station 105 (e.g., prior to performing a mobility procedure) .
  • SSB detection information may include a location (e.g., time-frequency resources) of the SSB.
  • the frequency location may include the subcarrier location (e.g., subcarrier 0) , a resource block that may contain the subcarrier (e.g., subcarrier 0) in a common resource block (e.g., an offset value, such as an offset to pointA) , an absolute frequency (e.g., the frequency value of pointA) , or the like.
  • the SSB information may include a numerology of the SSB, timing information (e.g., frame boundary) about the SSB relative to timing of a sideband link 315 channel transmitted by a UE 115 or low-cost UE 135 which sends the mobility information, the time domain pattern of the SSB (including periodicity of the SSB and first symbol in the slot) , the physical target base station 105 identifier, whether the target base station 105 is barred, or any combination thereof.
  • timing information e.g., frame boundary
  • the time domain pattern of the SSB including periodicity of the SSB and first symbol in the slot
  • the physical target base station 105 identifier e.g., whether the target base station 105 is barred, or any combination thereof.
  • the UE 115 or low-cost UE 135 may provide timing information about the SSB if the UE 115 or low-cost UE 135 tightly aligns with low-cost UE 135 (e.g., if low-cost UE 135-b and UE 115-c are close to each other) .
  • the mobility information may include an indication of a barred status of a target base station 105.
  • low-cost UE 135-b may receive mobility information (e.g., including SSB detection information) from UE 115-b over sideband link 315-a.
  • the mobility information may indicate a barred status of target base station 105-b.
  • low-cost UE 135-b may not attempt to acquire the SSB of the barred target base station 105-b.
  • FIG. 4 illustrates an example of a process flow 400 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • process flow 400 may implement aspects of wireless communications systems 100, 200, and 300.
  • process flow 400 may include base stations 105-d, a base station 105-e, a low-cost UE 135 d, and a UE 115-d, which may be examples of the corresponding devices described with reference to FIGs. 1, 2, and 3.
  • Process flow 400 may include features for low-cost UE 135 mobility complexity reduction resulting in lower power consumption, among other benefits.
  • base station 105-d may transmit one or more downlink signals (e.g., reference signals) on a first wireless channel associated with base station 105-d.
  • downlink signals e.g., reference signals
  • base station 105-e may transmit one or more downlink signals (e.g., reference signals) on a third wireless channel associated with base station 105-e.
  • downlink signals e.g., reference signals
  • low-cost UE 135-d may tune to wireless channel 405 associated with base station 105-d.
  • UE 115-d may perform one or more signal quality measurements, based at least in part on receiving the one or more downlink signals (e.g., at 405, 410, or both) .
  • UE 115-d may perform the one or more signal quality measurements according to a periodicity.
  • UE 115-d may perform a mobility procedure based at least in part on the signal quality measurements from base station 105-d and base station 105-e.
  • the mobility procedure may involve tuning UE 115-d to the third wireless channel associated with base station 105-e.
  • Tuning to base station 105-e, UE 115-d may include, in a connected mode, establishing a connection with base station 105-e, or, in when not operating in a connected mode, selecting base-station 105-e if UE 115-d is not in a connected mode.
  • UE 115-d may transmit mobility information to low-cost UE 135-d based at least in part on the signal quality measurements performed at 420.
  • UE 115-d may transmit the mobility information over a sidelink connection using a second wireless channel (e.g., a sideband communication link) between UE 115-d and low-cost UE 135-d.
  • UE 115-d may communicate with low-cost UE 135-d using an established connection, and may send the mobility information in a dedicated message.
  • UE 115-d may transmit the mobility information in a broadcast message over the sidelink connection. If UE 115-d performs a mobility procedure, the mobility information may include an indication of the mobility procedure.
  • the mobility information may include one or more signal quality measurements performed by UE 115-d on downlink signals received from one or more base stations (e.g., including base station 105-d, base station 105-e, or both) .
  • UE 115-d may transmit an indication of whether it is in a connected mode, its capability, or both to low-cost UE 135-d over the sidelink connection.
  • the UE 115-d may transmit synchronization information associated with base station 105-d (e.g., the target base station of a mobility procedure) .
  • the mobility information may include the synchronization information.
  • the mobility information may include one or more frequency positions for an SSB associated with base station 105-d, a numerology associated with an SSB associated with base station 105-d, timing information associated with an SSB associated with base station 105-d, a time domain pattern of an SSB associated with base station 105-d, a physical cell identifier associated with base station 105-d, a barred status of a base station 105, or any combination thereof.
  • Low-cost UE 135-d may monitor for and receive the mobility information transmitted by UE 115-d at 430. If the mobility information is transmitted in a dedicated (e.g., device-to-device) message, then low-cost UE 135-d may receive the mobility information on the established connection over the sideband link, and may select a target base station at 435.
  • a dedicated (e.g., device-to-device) message then low-cost UE 135-d may receive the mobility information on the established connection over the sideband link, and may select a target base station at 435.
  • low-cost UE 135-d may monitor for one or more broadcast messages transmitted at 430.
  • Low-cost UE 135-d may receive a plurality of broadcast messages from a set of UEs 115 or low-cost UEs 135 including UE 115-d.
  • low-cost UE 135-d may receive a first message of the plurality of broadcast messages over the sidelink connection with UE 115-d.
  • Low-cost UE 135-d may select UE 115-d (e.g., the mobility source UE) , from the set of UEs 115 and low-cost UEs 135.
  • low-cost UE 135-d may randomly select the first broadcast message from UE 115-d from the plurality of broadcast messages.
  • Low-cost UE 135-d may randomly select the mobility source UE, UE 115-d, from the set of UEs based on having selected the first broadcast message from UE 115-d from the plurality of UEs.
  • low-cost UE 135-d may determine the first broadcast message of the plurality of broadcast messages arrived before the rest of the plurality of broadcast messages. Low-cost UE 135-d may select the mobility source UE, UE 115-d, from the set of UEs based on determining which broadest message arrived first at 430.
  • base station 105-d may send an indication to low-cost UE 135-d, using the first wireless channel, to use UE 115-d as a mobility source UE.
  • Low-cost UE 135-d may select UE 115-d as a mobility source UE based on the indication from base station 105-d.
  • low-cost UE 135-d may determine a mobility procedure for each UE 115 of the set of UEs 115 and low-cost UEs 135 based on the plurality of broadcast messages. Low-cost UE 135-d may select UE 115-d as a source UE based at least in part on determining the mobility procedures.
  • low-cost UE 135-d may receive the first broadcast message from UE 115-d and determine an operational parameter associated with UE 115-d.
  • the operational parameter may include a transmit power for UE 115-d, a receive power for the first broadcast message, a signal quality of the first broadcast message, or any combination thereof.
  • Low-cost UE 135-d may select UE 115-d as the mobility source UE based at least in part on the operational parameter.
  • low-cost UE 135-d may determine that the broadcast message transmitted by UE 115-d at 430 has the highest receive power of all received broadcast message (e.g., for the duration of a fixed period of time) , and may select UE 115-d as the mobility source UE 115 based on the determining.
  • low-cost UE 135-d may select UE 115-d as the mobility source UE based on a connection mode of UE 115-d or capability of UE 115-d, as indicated in the mobility information.
  • the mobility information from the selected source UE 115-d may include an indication of the mobility procedure performed at 425 (i.e., tuning UE 115-d to the third wireless channel associated with base station 105-e) .
  • the mobility information may include one or more signal quality measurement performed by UE 115-d on one or more downlink signals from base station 105-d, base station 105-e, or both.
  • the mobility information may include synchronization information associated with base station 105-e or a barred status of a base station 105.
  • low-cost UE 135-d may identify an SSB associated with base station 105-e based at least in part on the mobility information.
  • low-cost UE 135-d may select a target base station 105-e for a mobility procedure based at least in part on the mobility information from UE 115-d. In some cases, if UE 115-d performed a mobility procedure at 425, then low-cost UE 135-d may follow UE 115 (e.g., may perform the same mobility procedure and select the same base station 105-d for the mobility procedure) . In some cases, low-cost UE 135-d may select base station 105-e to be the target base station based at least in part on the signal quality measurements received from UE 115-d.
  • Low-cost UE 135-d may select base station 105-e to be the target base station based at least in part on identifying an SSB associated with base station 105-e. Low-cost UE 135-d may refrain from selecting a base station 105 that is indicated as barred in the mobility information received at 430, and select base station 105-e instead.
  • low-cost UE 135-d may perform one or more signal quality measurement on one or more downlink signals received from base station 105-d at 405, base station 105-e at 410, or both.
  • Low-cost UE 135-d may perform the signal quality measurements according to an extended periodicity based at least in part on the signal quality measurements performed by UE 115-d. That is, low-cost UE 135-d may perform its own signal quality measurements less frequently, based on the signal quality measurements received in the mobility information at 430.
  • low-cost UE 135-d may perform a mobility procedure that involves tuning to the third wireless channel associated with base station 105-e.
  • the mobility procedure may be based on the indication of the mobility procedure performed by UE 115-d.
  • low-cost UE 135-d may perform a handover procedure and establish a connection with base station 105-d while operating in a connected mode.
  • low-cost UE 135-d may select base station 105-e and camp on the cell associated with base station 105-e when not operating in a connected mode.
  • low-cost UE 135-d may identify an SSB associated with base station 105-e, based on SSB detection information included in the mobility information, and may tune to base station 105-e based on the SSB detection information (e.g., at a reduced power cost) .
  • low-cost UE 135-d may use SSB detection information (e.g., received at 430 in the mobility information or in a separate dedicated or broadcast message from UE 115-d) to quickly or efficiently synchronize with target base station 105-e.
  • FIG. 5 shows a block diagram 500 of a device 505 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the device 505 may be an example of aspects of a UE 115 as described herein.
  • the device 505 may include a receiver 510, a communications manager 515, and a transmitter 520.
  • the device 505 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to UE mobility complexity reduction with external assistance, etc. ) . Information may be passed on to other components of the device 505.
  • the receiver 510 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the receiver 510 may utilize a single antenna or a set of antennas.
  • the communications manager 515 may tune the mobility target UE to a first wireless channel associated with a first base station, receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, select, based on the mobility information, a second base station as a target of a mobility procedure, and perform, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the communications manager 515 may also receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both, perform, based on receiving the one or more downlink signals, one or more signal quality measurements, and transmit, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the communications manager 515 may be an example of aspects of the communications manager 810 described herein.
  • the communications manager 515 may be implemented in hardware, software (e.g., executed by a processor) , or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 515, or its sub-components may be executed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC) , a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • ASIC application-specific integrated circuit
  • the communications manager 515 may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components.
  • the communications manager 515, or its sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • the communications manager 515, or its sub-components may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • I/O input/output
  • the transmitter 520 may transmit signals generated by other components of the device 505.
  • the transmitter 520 may be collocated with a receiver 510 in a transceiver module.
  • the transmitter 520 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the transmitter 520 may utilize a single antenna or a set of antennas.
  • the communications manager 515 may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 510 and transmitter 520 may be implemented as analog components (e.g., amplifiers, filters, antennas) coupled with the mobile device modem to enable wireless transmission and reception over one or more bands.
  • analog components e.g., amplifiers, filters, antennas
  • the communications manager 515 as described herein may be implemented to realize one or more potential advantages.
  • One implementation may allow the device to reduce the complexity of high complexity processing procedures, or refrain from performing such high complexity processing procedures (e.g., mobility procedures, RRM measurements, and the like) , resulting in increased processing efficiency and decreased power expenditures.
  • a processor of a UE 115 may increase system efficiency and decrease unnecessary processing at a device.
  • FIG. 6 shows a block diagram 600 of a device 605 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the device 605 may be an example of aspects of a device 505, or a UE 115 as described herein.
  • the device 605 may include a receiver 610, a communications manager 615, and a transmitter 650.
  • the device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • the receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to UE mobility complexity reduction with external assistance, etc. ) . Information may be passed on to other components of the device 605.
  • the receiver 610 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the receiver 610 may utilize a single antenna or a set of antennas.
  • the communications manager 615 may be an example of aspects of the communications manager 515 as described herein.
  • the communications manager 615 may include a tuning manager 620, a mobility information manager 625, a base station selection manager 630, a mobility procedure manager 635, a downlink signal manager 640, and a signal quality measurement manager 645.
  • the communications manager 615 may be an example of aspects of the communications manager 810 described herein.
  • the tuning manager 620 may tune the mobility target UE to a first wireless channel associated with a first base station.
  • the mobility information manager 625 may receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the base station selection manager 630 may select, based on the mobility information, a second base station as a target of a mobility procedure.
  • the mobility procedure manager 635 may perform, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the downlink signal manager 640 may receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both.
  • the signal quality measurement manager 645 may perform, based on receiving the one or more downlink signals, one or more signal quality measurements.
  • the mobility information manager 625 may transmit, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the transmitter 650 may transmit signals generated by other components of the device 605.
  • the transmitter 650 may be collocated with a receiver 610 in a transceiver module.
  • the transmitter 650 may be an example of aspects of the transceiver 820 described with reference to FIG. 8.
  • the transmitter 650 may utilize a single antenna or a set of antennas.
  • FIG. 7 shows a block diagram 700 of a communications manager 705 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the communications manager 705 may be an example of aspects of a communications manager 515, a communications manager 615, or a communications manager 810 described herein.
  • the communications manager 705 may include a tuning manager 710, a mobility information manager 715, a base station selection manager 720, a mobility procedure manager 725, a broadcast message manager 730, a signal quality measurement manager 735, a connection mode manager 740, and a downlink signal manager 745.
  • Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • the tuning manager 710 may tune the mobility target UE to a first wireless channel associated with a first base station.
  • the mobility information manager 715 may receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel. In some examples, the mobility information manager 715 may transmit, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel. In some examples, the mobility information manager 715 may receive, from the mobility source UE, synchronization information associated with the second base station, where performing the mobility procedure is based on the synchronization information.
  • the mobility information manager 715 may identify a synchronization signal block associated with the second base station based on the mobility information, where selecting the second base station is based on the synchronization signal block. In some examples, the mobility information manager 715 may refrain from selecting the third base station, where selecting the second base station is based on the refraining.
  • the mobility information manager 715 may transmit, to the mobility target UE, synchronization information associated with the second base station.
  • the mobility information includes an indication of the mobility procedure to tune the mobility source UE to the third wireless channel associated with the second base station, and where performing the mobility procedure to tune the mobility target UE to the third wireless channel is based on the indication.
  • the mobility information includes one or more signal quality measurements performed by the mobility source UE on one or more downlink signals from the first base station, the second base station, or both, and where selecting the second base station as the target of the mobility procedure is based on the received one or more signal quality measurements.
  • the mobility information includes one or more frequency locations associated with a synchronization signal block associated with the second base station, a numerology associated with a synchronization signal block associated with the second base station, timing information associated with a synchronization signal block associated with the second base station, a time domain pattern of a synchronization signal block associated with the second base station, a physical cell identifier associated with the second base station, a barred status of a third base station, or any combination thereof.
  • the mobility information includes one or more signal quality measurements performed by the mobility source UE on one or more downlink signals from the first base station, the second base station, or both, and where selecting the second base station as a target of the mobility procedure is based on the received one or more signal quality measurements.
  • the mobility information includes one or more frequency resources associated with a synchronization signal block associated with the second base station, a numerology associated with a synchronization signal block associated with the second base station, timing information associated with a synchronization signal block associated with the second base station, a time domain pattern of a synchronization signal block associated with the second base station, a physical cell identifier associated with the second base station, a barred status of a third base station, or any combination thereof.
  • the base station selection manager 720 may select, based on the mobility information, a second base station as a target of a mobility procedure. In some examples, the base station selection manager 720 may select, based on receiving the set of broadcast messages, the mobility source UE from the set of UEs, where selecting the second base station as the target of the mobility procedure is based on selecting the mobility source UE. In some examples, the base station selection manager 720 may select the second base station, where the mobility target UE is not operating in a connected mode.
  • the mobility procedure manager 725 may perform, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station. In some examples, performing a mobility procedure, where the mobility information includes an indication of the mobility procedure. In some examples, the mobility procedure manager 725 may tune the mobility source UE to a third wireless channel associated with a second base station. In some examples, the mobility procedure manager 725 may establish a connection with the second base station, where the mobility target UE is operating in a connected mode.
  • the signal quality measurement manager 735 may perform, based on receiving the one or more downlink signals, one or more signal quality measurements. In some examples, the signal quality measurement manager 735 may perform the one or more signal quality measurements on one or more downlink signals received from the first base station, the second base station, or both, according to an extended periodicity based on receiving the one or more signal quality measurements performed by the mobility source UE. In some examples, the signal quality measurement manager 735 may perform the one or more signal quality measurements according to a periodicity, where the mobility target UE performs the one or more signal quality measurements according to an extended periodicity. In some cases, the mobility source UE has performed a one or more signal quality measurements on one or more downlink signals from the first base station, the second base station, or both.
  • the downlink signal manager 745 may receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both.
  • the broadcast message manager 730 may monitor for a set of broadcast messages from a set of UEs including the mobility source UE during a period of time, where receiving the mobility information from the mobility source UE includes receiving, based on the monitoring, the set of broadcast messages, and where a first broadcast message of the set of broadcast messages includes the mobility information from the mobility source UE.
  • the broadcast message manager 730 may randomly select the first broadcast message from the set of broadcast messages, where selecting the mobility source UE is based on randomly selecting the first broadcast message.
  • the broadcast message manager 730 may determine that the first broadcast message of the set of broadcast messages arrived at the mobility target UE before a remainder of the set of broadcast messages, where selecting the mobility source UE is based on the determining.
  • the broadcast message manager 730 may determine, based on the first broadcast message, an operational parameter associated with the mobility source UE, where selecting the mobility source UE is based on the determining. In some examples, the broadcast message manager 730 may receive, from the first base station, an indication that the mobility source UE is a preferred UE, where selecting the mobility source UE is based on the indication. In some examples, the broadcast message manager 730 may determine, based on the set of broadcast messages, a respective mobility procedure performed by each UE of the set of UEs, where selecting the mobility source UE is based on the determining.
  • the broadcast message manager 730 may transmit a broadcast message over the sidelink connection, the broadcast message including the mobility information.
  • the operational parameter includes a transmit power for the mobility source UE, a receive power of the first broadcast message, a signal quality of the first broadcast message, or any combination thereof.
  • the connection mode manager 740 may determine a connection mode for the mobility source UE, a UE capability for the mobility source UE, or both, where receiving the mobility information is based on the determining. In some examples, the connection mode manager 740 may receive, over the sidelink connection, an indication of the connection mode for the mobility source UE, the UE capability for the mobility source UE, or both, where the determining is based on the indication. In some examples, the connection mode manager 740 may select the second base station, where the mobility target UE is not operating in a connected mode. In some examples, the connection mode manager 740 may transmit, over the sidelink connection, an indication of a connection mode for the mobility source UE, a UE capability for the mobility source UE, or both.
  • FIG. 8 shows a diagram of a system 800 including a device 805 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the device 805 may be an example of or include the components of device 505, device 605, or a UE 115 as described herein.
  • the device 805 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 810, an I/O controller 815, a transceiver 820, an antenna 825, memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., bus 845) .
  • buses e.g., bus 845
  • the communications manager 810 may tune the mobility target UE to a first wireless channel associated with a first base station, receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, select, based on the mobility information, a second base station as a target of a mobility procedure, and perform, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the communications manager 810 may also receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both, perform, based on receiving the one or more downlink signals, one or more signal quality measurements, and transmit, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the I/O controller 815 may manage input and output signals for the device 805.
  • the I/O controller 815 may also manage peripherals not integrated into the device 805.
  • the I/O controller 815 may represent a physical connection or port to an external peripheral.
  • the I/O controller 815 may utilize an operating system such as or another known operating system.
  • the I/O controller 815 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device.
  • the I/O controller 815 may be implemented as part of a processor.
  • a user may interact with the device 805 via the I/O controller 815 or via hardware components controlled by the I/O controller 815.
  • the transceiver 820 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 820 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 820 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 825. However, in some cases the device may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • the memory 830 may include RAM and ROM.
  • the memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 830 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.
  • the processor 840 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • the processor 840 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into the processor 840.
  • the processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting UE mobility complexity reduction with external assistance) .
  • the code 835 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications.
  • the code 835 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory.
  • the code 835 may not be directly executable by the processor 840 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • FIG. 9 shows a flowchart illustrating a method 900 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the operations of method 900 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 900 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below.
  • a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may tune the mobility target UE to a first wireless channel associated with a first base station.
  • the operations of 905 may be performed according to the methods described herein. In some examples, aspects of the operations of 905 may be performed by a tuning manager as described with reference to FIGs. 5 through 8.
  • the UE may receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the operations of 910 may be performed according to the methods described herein. In some examples, aspects of the operations of 910 may be performed by a mobility information manager as described with reference to FIGs. 5 through 8.
  • the UE may select, based on the mobility information, a second base station as a target of a mobility procedure.
  • the operations of 915 may be performed according to the methods described herein. In some examples, aspects of the operations of 915 may be performed by a base station selection manager as described with reference to FIGs. 5 through 8.
  • the UE may perform, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the operations of 920 may be performed according to the methods described herein. In some examples, aspects of the operations of 920 may be performed by a mobility procedure manager as described with reference to FIGs. 5 through 8.
  • FIG. 10 shows a flowchart illustrating a method 1000 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the operations of method 1000 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1000 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally, or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may tune the mobility target UE to a first wireless channel associated with a first base station.
  • the operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be performed by a tuning manager as described with reference to FIGs. 5 through 8.
  • the UE may receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, wherein the mobility information includes an indication of the mobility procedure to tune the mobility source UE to the third wireless channel associated with the second base station.
  • the operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a mobility information manager as described with reference to FIGs. 5 through 8.
  • the UE may select, based on the mobility information, a second base station as a target of a mobility procedure.
  • the operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be performed by a base station selection manager as described with reference to FIGs. 5 through 8.
  • the UE may perform, based on the indication of the mobility procedure included in the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be performed by a mobility procedure manager as described with reference to FIGs. 5 through 8.
  • FIG. 11 shows a flowchart illustrating a method 1100 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the operations of method 1100 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1100 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally, or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may tune the mobility target UE to a first wireless channel associated with a first base station.
  • the operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a tuning manager as described with reference to FIGs. 5 through 8.
  • the UE may monitor for a set of broadcast messages from a set of UEs including the mobility source UE during a period of time, where a first broadcast message of the set of broadcast messages includes mobility information from the mobility source UE.
  • the operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a broadcast message manager as described with reference to FIGs. 5 through 8.
  • the UE may select, based on receiving the set of broadcast messages, the mobility source UE from the set of UEs.
  • the operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a base station selection manager as described with reference to FIGs. 5 through 8.
  • the UE may receive mobility information from a mobility source UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, where receiving the mobility information from the mobility source UE includes receiving, based on the monitoring, the set of broadcast messages.
  • the operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be performed by a mobility information manager as described with reference to FIGs. 5 through 8.
  • the UE may select, based on the mobility information, a second base station as a target of a mobility procedure, where selecting the second base station as the target of the mobility procedure is based on selecting the mobility source UE.
  • the operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by a base station selection manager as described with reference to FIGs. 5 through 8.
  • the UE may perform, based on the mobility information, the mobility procedure to tune the mobility target UE to a third wireless channel associated with the second base station.
  • the operations of 1130 may be performed according to the methods described herein. In some examples, aspects of the operations of 1130 may be performed by a mobility procedure manager as described with reference to FIGs. 5 through 8.
  • FIG. 12 shows a flowchart illustrating a method 1200 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the operations of method 1200 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1200 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally, or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both.
  • the operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed by a downlink signal manager as described with reference to FIGs. 5 through 8.
  • the UE may perform, based on receiving the one or more downlink signals, one or more signal quality measurements.
  • the operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed by a signal quality measurement manager as described with reference to FIGs. 5 through 8.
  • the UE may transmit, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be performed by a mobility information manager as described with reference to FIGs. 5 through 8.
  • FIG. 13 shows a flowchart illustrating a method 1300 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the operations of method 1300 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1300 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below.
  • a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both.
  • the operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed by a downlink signal manager as described with reference to FIGs. 5 through 8.
  • the UE may perform, based on receiving the one or more downlink signals, one or more signal quality measurements.
  • the operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed by a signal quality measurement manager as described with reference to FIGs. 5 through 8.
  • the UE may perform a mobility procedure.
  • the operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed by a mobility procedure manager as described with reference to FIGs. 5 through 8.
  • the UE may transmit, based on the one or more signal quality measurements, mobility information to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel, where the mobility information includes an indication of the mobility procedure.
  • the operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed by a mobility information manager as described with reference to FIGs. 5 through 8.
  • FIG. 14 shows a flowchart illustrating a method 1400 that supports UE mobility complexity reduction with external assistance in accordance with aspects of the present disclosure.
  • the operations of method 1400 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1400 may be performed by a communications manager as described with reference to FIGs. 5 through 8.
  • a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below.
  • a UE may perform aspects of the functions described below using special-purpose hardware.
  • the UE may receive one or more downlink signals over a first wireless channel associated with a first base station, a third wireless channel associated with a second base station, or both.
  • the operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by a downlink signal manager as described with reference to FIGs. 5 through 8.
  • the UE may perform, based on receiving the one or more downlink signals, one or more signal quality measurements.
  • the operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed by a signal quality measurement manager as described with reference to FIGs. 5 through 8.
  • the UE may transmit, based on the one or more signal quality measurements, a broadcast message including mobility information, to a mobility target UE over a sidelink connection between the mobility target UE and the mobility source UE over a second wireless channel.
  • the operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed by a mobility information manager as described with reference to FIGs. 5 through 8.
  • LTE, LTE-A, LTE-A Pro, or NR may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks.
  • the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
  • UMB Ultra Mobile Broadband
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Institute of Electrical and Electronics Engineers
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims.
  • functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these.
  • Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer.
  • non-transitory computer-readable media may include random-access memory (RAM) , read-only memory (ROM) , electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • flash memory compact disk (CD) ROM or other optical disk storage
  • CD compact disk
  • magnetic disk storage or other magnetic storage devices or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer,
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.
  • the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”
  • the term “and/or, ” when used in a list of two or more items means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed. For example, if a composition is described as containing components A, B, and/or C, the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des procédés, des systèmes et des dispositifs de communication sans fil. De manière générale, un équipement utilisateur (UE) (par exemple, un UE cible de mobilité), peut s'accorder lui-même à un premier canal sans fil associé à une première station de base, recevoir des informations de mobilité en provenance d'un UE source de mobilité sur une connexion de liaison latérale entre l'UE cible de mobilité et l'UE source de mobilité sur un second canal sans fil, et peut sélectionner une seconde station de base en tant que cible d'une procédure de mobilité sur la base des informations de mobilité. L'UE cible de mobilité peut ensuite effectuer, sur la base des informations de mobilité, la procédure de mobilité pour accorder l'UE cible de mobilité à un troisième canal sans fil associé à la seconde station de base.
PCT/CN2019/123187 2019-12-05 2019-12-05 Réduction de la complexité de la mobilité d'un équipement utilisateur avec assistance externe WO2021109052A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/123187 WO2021109052A1 (fr) 2019-12-05 2019-12-05 Réduction de la complexité de la mobilité d'un équipement utilisateur avec assistance externe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/123187 WO2021109052A1 (fr) 2019-12-05 2019-12-05 Réduction de la complexité de la mobilité d'un équipement utilisateur avec assistance externe

Publications (1)

Publication Number Publication Date
WO2021109052A1 true WO2021109052A1 (fr) 2021-06-10

Family

ID=76221388

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/123187 WO2021109052A1 (fr) 2019-12-05 2019-12-05 Réduction de la complexité de la mobilité d'un équipement utilisateur avec assistance externe

Country Status (1)

Country Link
WO (1) WO2021109052A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013013573A1 (fr) * 2011-07-27 2013-01-31 华为技术有限公司 Procédé de transfert intercellulaire, équipement de station de base et équipement utilisateur
WO2016026151A1 (fr) * 2014-08-22 2016-02-25 华为技术有限公司 Système de communication, nœud mobile local et station de base
CN106162769A (zh) * 2016-08-17 2016-11-23 努比亚技术有限公司 一种基站切换方法及终端

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013013573A1 (fr) * 2011-07-27 2013-01-31 华为技术有限公司 Procédé de transfert intercellulaire, équipement de station de base et équipement utilisateur
WO2016026151A1 (fr) * 2014-08-22 2016-02-25 华为技术有限公司 Système de communication, nœud mobile local et station de base
CN106162769A (zh) * 2016-08-17 2016-11-23 努比亚技术有限公司 一种基站切换方法及终端

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CATT: "QoS Management for V2X", R1-1812623，3GPP TSG RAN WG1 MEETING #95, 16 November 2018 (2018-11-16), XP051478864 *
CATT: "QoS Management in NR V2X", R1-1906320，3GPP TSG RAN WG1 MEETING #97, 17 May 2019 (2019-05-17), XP051708355 *

Similar Documents

Publication Publication Date Title
US11937208B2 (en) Reference signal monitoring occasion updates for idle and inactive user equipment
EP3909154B1 (fr) Estimation de perte de trajet
WO2021037207A1 (fr) Gestion de faisceau pour partie de bande passante ne comprenant pas de bloc de signaux de synchronisation
US11622414B2 (en) Enhanced connection release techniques for wireless communications systems
CN114009103B (zh) 新无线电同步信号块相关空闲测量配置
WO2021011376A1 (fr) Mesures directionnelles pour émission de signal de synchronisation de liaison latérale
US11722275B2 (en) Techniques for sounding reference signal carrier switching
WO2022020986A1 (fr) Affinement adaptatif de faisceau de radiomessagerie pour équipement utilisateur au repos ou inactif
WO2021159472A1 (fr) Transmissions de signal de référence de sondage (srs) au-delà de la bande passante (bwp)
US11937197B2 (en) Techniques for using a synchronization signal block for measurements
US20220232474A1 (en) Ue idle and inactive mode enhancement with sidelink
CN116134753A (zh) 用于无线通信中的波束切换的技术
WO2021046836A1 (fr) Signalisation internodale de configuration de mesure
WO2021109052A1 (fr) Réduction de la complexité de la mobilité d'un équipement utilisateur avec assistance externe
US20220368487A1 (en) Uplink reference signal transmissions during power saving operations
WO2023010421A1 (fr) Transmission de canal d'accès aléatoire et surveillance de liaison descendante par un équipement utilisateur semi-duplex
US20230120574A1 (en) Parameter reporting techniques for reduced capability user equipment
WO2021203229A1 (fr) Prévention de perte de service dans un mode non autonome d'une cellule partagée
US11864113B2 (en) Techniques for reducing wakeup latency
US11848733B2 (en) Priority levels for channel state information reporting
US20240106600A1 (en) Dynamic indication of tracking reference signal
WO2022116129A1 (fr) Mappage d'informations de commande de liaison montante pour commutation de transmission de liaison montante
WO2022170556A1 (fr) Identifiant d'équipement utilisateur supplémentaire pour réponse de radiomessagerie
EP4338488A1 (fr) Transmissions de signaux de référence de liaison montante pendant des opérations d'économie d'énergie
US20230091873A1 (en) Full-duplex cell indication for full-duplex operation

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19954827

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19954827

Country of ref document: EP

Kind code of ref document: A1