WO2024030136A1 - Changements de réglage de mobilité intelligents dans un environnement à changement rapide - Google Patents

Changements de réglage de mobilité intelligents dans un environnement à changement rapide Download PDF

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Publication number
WO2024030136A1
WO2024030136A1 PCT/US2022/039623 US2022039623W WO2024030136A1 WO 2024030136 A1 WO2024030136 A1 WO 2024030136A1 US 2022039623 W US2022039623 W US 2022039623W WO 2024030136 A1 WO2024030136 A1 WO 2024030136A1
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WIPO (PCT)
Prior art keywords
setting
user equipment
mobility
mobility setting
timing advance
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PCT/US2022/039623
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English (en)
Inventor
Lars Dalsgaard
Rafael Cauduro DIAS DE PAIVA
Dimitri GOLD
Samantha Caporal Del Barrio
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Nokia Technologies Oy
Nokia Of America Corporation
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.)
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Application filed by Nokia Technologies Oy, Nokia Of America Corporation filed Critical Nokia Technologies Oy
Priority to PCT/US2022/039623 priority Critical patent/WO2024030136A1/fr
Publication of WO2024030136A1 publication Critical patent/WO2024030136A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/005—Moving wireless networks

Definitions

  • Some example embodiments may generally relate to mobile or wireless telecommunication systems, such as Long Term Evolution (LTE) or fifth generation (5G) new radio (NR) access technology, or 5G beyond, or other communications systems.
  • LTE Long Term Evolution
  • 5G fifth generation new radio
  • certain example embodiments may relate to apparatuses, systems, and/or methods for intelligent mobility setting changes in a fast changing environment.
  • Examples of mobile or wireless telecommunication systems may include the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), Long Term Evolution (LTE) Evolved UTRAN (E-UTRAN), LTE- Advanced (LTE-A), MulteFire, LTE-A Pro, and/or fifth generation (5G) radio access technology or new radio (NR) access technology.
  • UMTS Universal Mobile Telecommunications System
  • UTRAN Long Term Evolution
  • E-UTRAN Long Term Evolution
  • LTE-A LTE- Advanced
  • MulteFire LTE-A Pro
  • LTE-A Pro new radio
  • Fifth generation (5G) wireless systems refer to the next generation (NG) of radio systems and network architecture.
  • 5G network technology is mostly based on new radio (NR) technology, but the 5G (or NG) network can also build on E-UTRAN radio.
  • NR will provide bitrates on the order of 10-20 Gbit/s or higher, and will support at least enhanced mobile broadband (eMBB) and ultra-reliable low-latency communication (URLLC) as well as massive machine-type communication (mMTC).
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low-latency communication
  • mMTC massive machine-type communication
  • NR is expected to deliver extreme broadband and ultra-robust, low- latency connectivity and massive networking to support the Internet of Things (loT).
  • LoT Internet of Things
  • Some example embodiments may be directed to a method.
  • the method may include receiving, from a network element, configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the method may also include applying the at least one mobility setting.
  • the method may further include evaluating at least one of a first timing advance value, a received time interval variation, or a frequency offset between a user equipment and the network element against the at least one parameter.
  • the method may include switching from the at least one mobility setting to a second mobility setting based on the evaluation.
  • the apparatus may include at least one processor and at least one memory including computer program code.
  • the at least one memory and computer program code may also be configured to, with the at least one processor, cause the apparatus at least to receive, from a network element, configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the apparatus may also be caused to apply the at least one mobility setting.
  • the apparatus may further be caused to evaluate at least one of a first timing advance value, a received time interval variation, or a frequency offset between the apparatus and the network element against the at least one parameter.
  • the apparatus may be caused to switch from the at least one mobility setting to a second mobility setting based on the evaluation.
  • the apparatus may include means for receiving, from a network element, configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the apparatus may also include means for applying the at least one mobility setting.
  • the apparatus may further include means for evaluating at least one of a first timing advance value, a time interval variation, or a frequency offset between the apparatus and the network element against the at least one parameter.
  • the apparatus may include means for switching from the at least one mobility setting to a second mobility setting based on the evaluation.
  • a non-transitory computer readable medium may be encoded with instructions that may, when executed in hardware, perform a method.
  • the method may include receiving, from a network element, configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the method may also include applying the at least one mobility setting.
  • the method may further include evaluating at least one of a first timing advance value, a received time interval variation, or a frequency offset between a user equipment and the network element against the at least one parameter.
  • the method may include switching from the at least one mobility setting to a second mobility setting based on the evaluation.
  • the method may include receiving, from a network element, configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the method may also include applying the at least one mobility setting.
  • the method may further include evaluating at least one of a first timing advance value, a received time interval variation, or a frequency offset between a user equipment and the network element against the at least one parameter.
  • the method may include switching from the at least one mobility setting to a second mobility setting based on the evaluation.
  • FIG. 1 may depict an apparatus that may include circuitry configured to receive, from a network element, configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the apparatus may also include circuitry configured to apply the at least one mobility setting.
  • the apparatus may further include circuitry configured to evaluate at least one of a first timing advance value, a received time interval variation, or a frequency offset between the apparatus and the network element against the at least one parameter.
  • the apparatus may include circuitry configured to switch from the at least one mobility setting to a second mobility setting based on the evaluation.
  • Certain example embodiments may be directed to a method.
  • the method may include configuring a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the method may also include determining a need to update a timing advance value applied by the user equipment.
  • the method may further include transmitting a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • the method may include receiving data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • the apparatus may include at least one processor and at least one memory including computer program code.
  • the at least one memory and computer program code may be configured to, with the at least one processor, cause the apparatus at least to configure a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the apparatus may also be caused to determine a need to update a timing advance value applied by the user equipment.
  • the apparatus may further be caused to transmit a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • the apparatus may be caused to receive data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • the apparatus may include means for configuring a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the apparatus may also include means for determining a need to update a timing advance value applied by the user equipment.
  • the apparatus may further include means for transmitting a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • the apparatus may include means for receiving data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • a non-transitory computer readable medium may be encoded with instructions that may, when executed in hardware, perform a method.
  • the method may include configuring a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the method may also include determining a need to update a timing advance value applied by the user equipment.
  • the method may further include transmitting a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • the method may include receiving data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • Other example embodiments may be directed to a computer program product that performs a method.
  • the method may include configuring a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the method may also include determining a need to update a timing advance value applied by the user equipment.
  • the method may further include transmitting a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • the method may include receiving data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • Other example embodiments may be directed to an apparatus that may include circuitry configured to configure a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the apparatus may also include circuitry configured to determine a need to update a timing advance value applied by the user equipment.
  • the apparatus may further include circuitry configured to transmit a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • the apparatus may include circuitry configured to receive data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • FIG. 1 illustrates an example unidirectional high-speed train (HST) scenario.
  • FIG. 2(a) illustrates an example system-level performance of an intercell mobility failure percentage during discontinuous reception (DRX).
  • FIG. 2(b) illustrates an example signal to interference and noise ratio (SINR) distribution in a legacy scenario in unidirectional HST frequency range 2 (FR2).
  • SINR signal to interference and noise ratio
  • FIG. 2(c) illustrates another example SINR distribution under an enhanced scenario in unidirectional HST FR2.
  • FIG. 3(a) illustrates mobility-related key performance indicators (KPIs) received from a system-level simulator corresponding to faulty mobility events.
  • KPIs mobility-related key performance indicators
  • FIG. 3(b) illustrates mobility-related KPIs received from the systemlevel simulator corresponding to time of outage.
  • FIG. 3(c) illustrates mobility-related KPIs received from the systemlevel simulator corresponding to frequency of handovers.
  • FIG. 4 an example of multiple mobility settings configured in an HST FR2 scenario.
  • FIG. 5 illustrates an example signal flow diagram, according to certain example embodiments.
  • FIG. 6 illustrates another example signal flow diagram, according to certain example embodiments.
  • FIG. 7 illustrates an example of a synchronization signal block (SSB) received time interval for a moving train, according to certain example embodiments.
  • SSB synchronization signal block
  • FIG. 8 illustrates a variation in a received time interval as a function of distance of a user equipment (UE) to a gNB, according to certain example embodiments.
  • UE user equipment
  • FIG. 9 illustrates a flow diagram of how the proximity to the gNB can be detected, according to certain example embodiments.
  • FIG. 10 illustrates a variation in frequency offset, according to certain example embodiments.
  • FIG. 11 illustrates an example flow diagram of how the proximity to the gNB can be detected, according to certain example embodiments.
  • FIG. 12 illustrates an example flow diagram of a method, according to certain example embodiments.
  • FIG. 13 illustrates an example flow diagram of another method, according to certain example embodiments.
  • FIG. 14 illustrates a set of apparatuses, according to certain example embodiments.
  • 3GPP 3 rd Generation Partnership Project
  • 3GPP 3 rd Generation Partnership Project
  • Certain principles and solutions in 3 GPP may be applicable for higher velocity scenarios than HST, and even non-HST scenarios, which may benefit from different mobility (z.e., handover (HO) or beam switching) configurations in a cell.
  • the UE, the network, or both may make use of directional beam steering (beam forming) to improve link budget, and to ensure larger cell coverage.
  • Applying beam forming may introduce directionality of uplink (UL) and downlink (DL) signals.
  • UL uplink
  • DL downlink
  • the UE may have maximum reception gain (e.g, UE Rx beam is directed towards the gNB Tx beam), while the network optimizes its DL transmission beam such that it is optimal in terms of directing as much of the transmitted energy as possible towards the UE. Similar concepts may be applicable for the UL link.
  • the baseline deployment may use a number of cells deployed along the train track.
  • Each cell may consist of one or more remote radio heads (RRHs) (also referred to as transmission-reception point (TRP), access point (AP) or similar), which may be connected to one distributed unit (DU) that handles the physical resource scheduling.
  • RRHs remote radio heads
  • TRP transmission-reception point
  • AP access point
  • DU distributed unit
  • the RRHs of the cell can be non-collocated (i.e., distributed along the railway track).
  • DPS dynamic point selection
  • FIG. 1 illustrates an example unidirectional HST scenario.
  • the train is traveling in the opposite direction of the serving beam orientation. This may pose a challenge for mobility because the signal strength of RRH 1 quickly decays when the UE passes the RRH1.
  • One reason for this is due to the closeness of the RRH’s to the track.
  • antenna panels may usually be used with a backplane (i.e., the back-lobe that could potentially improve the coverage behind the RRH is attenuated).
  • FIG. 2(a) illustrates an example system-level performance of an inter-cell mobility failure percentage for different values of discontinuous reception (DRX) cycle length with legacy (scaling factor 8) and enhanced (scaling factor 2) UE requirements
  • FIG. 2(b) illustrates an example signal to interference and noise ratio (SINR) distribution with a legacy and enhanced UE requirements in unidirectional HST FR2 deployment when the UE is travelling from the serving beam (same direction)
  • SINR signal to interference and noise ratio
  • FIGs. 2(a) - 2(c) illustrates another example SINR distribution with a legacy and enhanced UE requirements in unidirectional HST FR2 deployment when the UE is travelling towards the serving beam (opposite direction).
  • FIGs. 2(a) - 2(c) even with no DRX in use and with scaling factor 2, HO failures occur in order of more than 15%, making it impossible to provide functional and robust mobility.
  • FIGs. 2(a) - 2(c) even without DRX and scaling 2, significant drops in the connection, and low SINR conditions at the cell change are observed.
  • the other direction option when the train is moving in the same direction as the beam directions, no mobility problems are observed, and the SINR remains high enough.
  • Ping-pong is defined as a set of two handovers that happen between two different base stations (e.g., BS1 and BS2) during one second (i.e., the source of the first HO is the same as the target of the second handover).
  • the UE may be attached to BS 1, and then HO is performed to BS2.
  • FIG. 3(a) illustrates mobility-related key performance indicators (KPIs) received from the system-level simulator corresponding to faulty mobility events. Further, FIG. 3(b) illustrates mobility-related KPIs received from the system-level simulator corresponding to time of outage, and FIG. 3(c) illustrates mobility-related KPIs received from the system-level simulator corresponding to frequency of HOs.
  • KPIs key performance indicators
  • FIG. 3(a) - 3(c) illustrates mobility-related KPIs received from the system-level simulator corresponding to frequency of HOs.
  • two different HO parameter settings may be considered independently. In particular, these settings may be conservative where the offset may be 3 dB, time to trigger (TTT) is 80 ms, while the HO aggressive has an offset of 0 dB, and TTO of 0 ms.
  • failure rate may significantly improve, but also without DRX there are still 4.4% of failures.
  • more aggressive HO parameters may considerably increase the rate of HOs (i.e., the number of ping-pongs).
  • time-of-outage decreases with aggressive settings, it is not clearly due to an increased number of handovers.
  • 3 GPP describes how to address the problem using a solution in which the UE applies different mobility settings at different times.
  • a solution in which the UE applies different mobility settings at different times.
  • Such an approach leaves the complexity on the network side, and calls for network tracking and measurement reporting from the UE side.
  • a UE assisted solution may be beneficial, while the actual trigger(s) rules for when the UE shall switch mobility settings has not been considered.
  • FIG. 4 illustrates an example of multiple mobility settings configured in an HST FR2 scenario.
  • the UE is moving in the direction opposite to the serving beam. Initially, the UE follows one mobility setting set (1-1) when it is far away from the RRH location (i.e., the UE is not at the coverage edge), and moving towards the RRH.
  • the different mobility setting sets may refer to the difference in mobility settings that can be in the periodicity and/or filtering parameters of the L1/L3 measurements and reporting. Additionally, if conditional HO (CHO) is in use, then CHO configuration for setting 1-1 and 2-1 may be different or only applicable for 2-1, similarly to conservative and aggressive HO parameters described above.
  • conditional HO CHO
  • the setting set may be changed (step 4) to another setting set (2-1) once the UE enters the edge area of the serving beam, and in this case, close to the serving RRH.
  • the beam may then be changed (step 5).
  • the mobility applied setting set may either be reset back to the default setting set (1-1, non-edge area set), or to a new setting set (1-2, another non-edge area set) (Step 6).
  • mobility settings (1-1) and (1-2) may be different, and the same may be true for mobility settings (2-1) and (2-2). This same approach may also be applied in bi-directional HST deployments.
  • certain example embodiments may provide ways to ensure that the UE is applying the correct mobility setting set if the UE has been appropriately configured. For instance, as described herein, certain example embodiments may provide a trigger to change between configured setting sets based on a timing advance (TA) solution, which can be network configured and UE triggered, or alternatively, it may be based on a network controlled trigger. In other example embodiments, conditions may be introduced on the frequency offset (FO) experienced by the UE. For instance, in some example embodiments, a combination of different conditions (e.g., both on the TA and FO) may be implemented.
  • TA timing advance
  • FO frequency offset
  • the network may configure the UE with more than one mobility setting set, and related TA triggering thresholds.
  • the change of mobility setting set may depend on the applied TA value (which may be assigned by the network).
  • the TA may be calculated by the UE itself.
  • the TA may be calculated by the UE after a cell or beam change.
  • the UE may evaluate the assigned TA against a TA threshold for each setting. Additionally, the UE may apply the setting set that matches the assigned TA to the TA threshold (interval). In other example embodiments, each time the UE receives a TA adjustment command from the network, the UE may evaluate the newly assigned TA value against the settings and the related TA value. If the newly assigned TA value matches the TA threshold (or is within a TA value range), the UE may switch to a new mobility setting set.
  • the change of setting set may be included in a medium access control control element (MAC CE), which may then explicitly allow the network to control when the UE may apply which setting set.
  • MAC CE medium access control control element
  • the indication may, for example, be sent together with the TA command.
  • the UE may perform a timing and/or frequency offset to determine the proximity to the gNB and switch to a new mobility setting set. For instance, in certain example embodiments, the UE may monitor the received time of a reference signal, and the periodicity associated with that reference signal. When the UE is far from the gNB, the reference signal periodicity may be nearly constant. However, when the UE approaches the gNB, the periodicity may vary, and may be used as an indication that the UE is to switch to the new mobility setting. In certain example embodiments, a threshold may be configured by the gNB indicating how large this variation should be before the setting set is changed. The choice of this threshold may depend on the deployment scenario, for example, the distance between gNBs/RRHs, typical speeds, and others. When the difference in periodicity of the reference signal exceeds this configured threshold, the UE may switch to the new set.
  • the above scenario described with respect to timing can also be implemented using FO variation.
  • FO will be the maximum, and will be rather constant.
  • the FO may be reduced.
  • the UE may monitor the FO of the received downlink signals (e.g., reference signal). Additionally, the gNB may configure a FO threshold for the proximity detection. Once the UE makes handover to a new cell, or switches to a new RRH, it may store the initial FO in this new cell/RRH. Further, the UE may monitor the variation in FO and once it exceeds the configured threshold by the gNB it may switch to the new mobility setting.
  • FIG. 5 illustrates an example signal flow diagram, according to certain example embodiments.
  • FIG. 5 illustrates a UE-triggered mobility setting change using a timing advance (TA) command (TAG) that is carried by a MAC control element (MAC CE).
  • TA timing advance
  • MAC CE MAC control element
  • the UE may initially be in connected mode with a valid TA assigned.
  • the UE may be configured with, for example, mobility setting sets (e.g., set 1-1 and 1-2), and the related switching rules.
  • a TA range
  • the network e.g., gNB/Cell 1
  • the RRC configuration may include one or more mobility setting sets and related TA range values when each set shall be applied by the UE.
  • the UE may evaluate the currently applied TA against the setting set decision threshold.
  • the setting set decision threshold may be determined/configured by the network to the UE, and the network may transmit/configure the UE with the threshold (e.g., with RRC configuration at operation 2). The UE may then apply the correct setting set based on the evaluation of the currently applied TA against the configured threshold (e.g. setting set 1-1 in FIG. 4).
  • the transmission point e.g., gNB, transmission reception point (TRP), RRH, etc.
  • the UE may simultaneously evaluate the new TA against the setting set threshold (e.g., specific TA value or TA range). At operation 8, the UE may determine that the new TA exceeds the threshold. At operation 9, when the UE has evaluated and concluded that the newly assigned TA value leads to a change in the setting set, the UE may apply the mobility setting set 1-2. [0054] At operation 10 in FIG. 5, the UE may continue data transmission and normal procedures with the network including performing regular measurements for mobility. At operation 11, the UE may be triggered to prepare and transmit a measurement report to the network. In certain example embodiments, the measurement report may include an L3-RSRP measurement report.
  • the measurement report may include an L3-RSRP measurement report.
  • the measurement report may be a radio resource management (RRM) measurement report that carries different quantities such as, for example, RSRP, RSRQ, or SINR.
  • RRM radio resource management
  • the network may then evaluate the received measurements from the UE and determine that HO is needed. In some example embodiments, HO may be determined to be needed during an A3 event when the target cell is x dB above a serving cell.
  • the network may request the UE to perform a cell change to a new cell.
  • the UE may perform a cell change based on the HO command from the network.
  • the UE may receive a new TA from the network.
  • a random access procedure may be performed between the UE and the network to establish a new connection with the new cell.
  • the UE may be assigned a new TA value at operation 16.
  • the UE may simultaneously evaluate the new TA against the setting set threshold.
  • the UE may apply the mobility setting 1-1.
  • the evaluation may be performed based on a threshold as in operations 7 to 9. For instance, in one example embodiment, operation 18 may be based on the TA value threshold or range.
  • the UE may perform data exchange with the network under the mobility setting according to the new TA value.
  • a specific TA value threshold may be used as an example. However, in other example embodiments, this may also be a TA range. For instance, the assigned TA value may be within a given range of TA values. Additionally, in other example embodiments, HO may be used as an example while certain example embodiments are not limited to HO only, but may be applied to other switching between non-collocated transmission sources. In one example embodiment, the setting set could change based on the currently active DL beam (e.g., TCI state).
  • FIG. 6 illustrates another example signal flow diagram, according to certain example embodiments.
  • FIG. 6 illustrates an example network-triggered mobility setting change using TAC.
  • the operations illustrated in FIG. 6 is similar to those of FIG. 5 described above, and are therefore not repeated herein.
  • the difference between the operations of FIG. 6 from FIG. 5 is that in the example signal flow diagram of FIG. 6, the instruction about which setting set to be applied by the UE may be explicitly indicated by the network.
  • the explicit indication of which setting set is to be applied by the UE may be done based on a network evaluation algorithm and/or based on TA (in connection with operations 6 and 15).
  • instructions concerning which setting to be applied may be signaled to the UE (operations 6 and 15) in this example together with the TA command. Once the UE receives the instruction, it may apply the indicated mobility setting set (operations 8 and 16).
  • MAC CE and TA may be used.
  • the decision does not need to be linked to the TA, and any network specific algorithm may also be used.
  • the MAC CE it may also be possible to indicate the mobility setting set change by other signaling means including, for example, downlink control information (DCI) based indication.
  • DCI downlink control information
  • the setting set could be changed together with change of active DL beam change (e.g. TCI state change).
  • the mobility setting set may change based on a time variation of a reference signal.
  • FIG. 7 illustrates an example of a synchronization signal block (SSB) received time interval for a moving train, according to certain example embodiments.
  • the UE moving at high speed may detect the proximity of the UE to the gNB (i.e., the triggering condition for the switch in between the mobility settings; operation 3) based on the time interval variation of a reference signal.
  • FIG. 7 illustrates an example where the train is moving at 350 km/h, the gNB is placed at 150 m from the train track, and a reference signal is sent with a 20 ms interval from the gNB/RRH.
  • this reference signal may be a SSB, tracking reference signal (TRS), or other type of reference signal.
  • the SSBs may be received with an interval of 20 ms - 6.34 ns, and when the UE is closer to the gNB, this interval me become closer to 20 ms. For example, if the UE is exactly at the point where the gNB/RRH is closest to the railway track, this interval may be exactly 20 ms. If the UE is 50 m before the gNB, the interval may be 20 ms - 2.03 ns.
  • this method may be used in conjunction with the above-described operations illustrated in FIGs. 5 and 6, or as a standalone procedure. Additionally, in other example embodiments, this method may not need to rely on the UE being updated with TA by the network.
  • FIG. 8 illustrates the variation in the received time interval as a function of distance of the UE to the gNB, according to certain example embodiments.
  • FIG. 8 illustrates a plot showing the variation on the received time of reference signals spaced at 20 ms when a train is moving at 350 km/h and a gNB distance to the track is 150 m on a unidirectional deployment. From FIG. 8, it may be observed that the received interval variation is more or less flat at 6.3 ns when the UE is far from the gNB, and it decreases exponentially as the UE becomes closer to the gNB.
  • this example is shown for a HST scenario, in other example embodiments, the same approach may be used in other scenarios with mobility.
  • FIG. 9 illustrates a flow diagram of how the proximity to the gNB can be detected, according to certain example embodiments.
  • FIG. 9 illustrates how the proximity to the gNB can be detected considering the reference signal received time interval variation.
  • the time interval detected by the UE may be used for estimating when the UE is close to the gNB/RRH.
  • the UE approaching the gNB with high speed may perform the proximity detection based on various parameters that may include constants.
  • the proximity detection may be based on parameters configured by the network.
  • the parameters may include TRS as the expected reference signal transmit interval, Tmax as the proximity detection threshold comparing the difference between current measured interval dT and the last, or filtered one dTp, T spe ed as the threshold used to evaluate that the UE is indeed approaching the gNB/RRH and that the speed is above the limit, and RSRPmin as the threshold used for the minimum RSRP expected when the UE is close to the gNB/RRH.
  • the proximity detection may be performed by detecting the received time of the reference signal as Ti for each time the monitored reference signal is expected.
  • the proximity (e.g., proximity in relation to distance or time) detection may be performed based on various criteria.
  • one criteria may include using dTp ⁇ T spe ed to identify that the UE is moving in the direction of the gNB/RRH above the minimum speed.
  • Another criteria may include using RSRP > RSRPmin to limit the proximity detection when the UE has a high RSRP.
  • a further criteria my include using dT - dTp > Tmax to identify if the UE is close to the gNB/RRH based on the reference signal interval.
  • the UE may continue the detection procedure. For instance, at 925, the UE may update the filtered value dTp based on the latest value dT.
  • the UE may then wait for the next reference signal, and start again at operation 905. However, at 935, if the proximity check passes, the UE may trigger the proximity-based procedures described above (e.g., triggering mobility setting 2-1 or 2-2 in FIG. 4).
  • the mobility setting set may be changed based on an FO variation.
  • FIG. 10 illustrates a variation in FO, according to certain example embodiments.
  • the variation of the FO may be similarly derived as with the time interval variation described above. For instance, when a train is far from the gNB, the relative speed from the UE and gNB is maximum, resulting in maximum frequency offset. Similarly, the FO may be reduced when the UE is closer to the projection of the gNB location on the train track.
  • this example is shown for a HST scenario, in other example embodiments, the same approach may be used in other scenarios with mobility. Additionally, this example is shown for the detection performed by the UE, but in other example embodiments, the same procedure may also be implemented by a gNB.
  • FIG. 11 illustrates an example flow diagram of how the proximity to the gNB can be detected, according to certain example embodiments.
  • FIG. 11 illustrates how the proximity of the UE to the gNB can be detected by the UE considering the variation on the FO.
  • the UE approaching a gNB with high speed may perform the proximity detection based on various parameters that may be constants or configure by the network.
  • the parameters may include Fmax as the proximity detection threshold comparing the difference between current measured frequency offset F i and the last, or filtered one FF, F spe ed as the threshold used to evaluate that the UE is indeed approaching the gNB/RRH and that the speed is above the limit, and RSRPmin as the threshold used for the minimum RSRP expected when the UE is close to the gNB/RRH.
  • Fmax the proximity detection threshold comparing the difference between current measured frequency offset F i and the last, or filtered one FF
  • F spe ed as the threshold used to evaluate that the UE is indeed approaching the gNB/RRH and that the speed is above the limit
  • RSRPmin as the threshold used for the minimum RSRP expected when the UE is close to the gNB/RRH.
  • the proximity detection may be performed by detecting the received time of the reference signal as F i for each time the monitored reference signal is expected. In certain example embodiments, this value may be expected to be a positive value if the UE is approaching the
  • the proximity may be detected based on various criteria. For instance, one criteria may include using FF > F spe ed to identify that the UE is moving in the direction of the gNB/RRH above the minimum. Another criteria may include using RSRP > RSRPmin to limit the proximity detection when the UE has a high RSRP value. A further criteria may include using FF - Fi > Fmax to identify if the UE is close to the gNB/RRH based on the reference signal interval.
  • the UE may then wait for the next reference signal, and start again at operation 1105.
  • the UE
  • FIG. 12 illustrates an example flow diagram of a method, according to certain example embodiments.
  • the method of FIG. 12 may be performed by a network entity, or a group of multiple network elements in a 3GPP system, such as LTE or 5G-NR.
  • the method of FIG. 12 may be performed by a UE similar to one of apparatuses 10 or 20 illustrated in FIG. 14.
  • the method of FIG. 12 may include, at 1200, receiving, from a network element, a configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the method may also include, at 1205, applying the at least one mobility setting.
  • the method may further include, at 1210, evaluating at least one of a first timing advance value, a received time interval variation, or a frequency offset between a user equipment and the network element against the at least one parameter. Additionally, the method may include, at 1215, switching from the at least one mobility setting to a second mobility setting based on the evaluation.
  • the switching from the at least one mobility setting to the second mobility setting is triggered by a timing advance command received from the network element, or triggered by the user equipment.
  • the timing advance command comprises a timing advance value
  • the at least one parameter may include a threshold value
  • the switching of the at least one mobility setting to the second mobility setting is triggered when the timing advance value is above or below the threshold value.
  • the method may also include evaluating a new timing advance value against the at least one parameter, and switching from the second network setting to the at least one mobility network setting based on the evaluation of the third timing advance value.
  • the method may further include estimating a proximity of the user equipment to the network element based on the received time interval variation or the frequency offset.
  • the method may further include updating a filtered received time interval variation based on a latest filtered received time interval variation value, or updating a filtered frequency offset value based on a latest filtered frequency offset value.
  • the method may further include triggering the evaluation of the at least one of a first timing advance value, the received time interval variation, and the frequency offset against the at least one parameter, and the switching from the at least one mobility setting to the second mobility setting.
  • FIG. 13 illustrates an example of a flow diagram of another method, according to certain example embodiments.
  • the method of FIG. 13 may be performed by a network entity, or a group of multiple network elements in a 3 GPP system, such as LTE or 5G-NR.
  • the method of FIG. 13 may be performed by a gNB, network, cell, or any other device similar to one of apparatuses 10 or 20 illustrated in FIG. 14.
  • the method of FIG. 13 may include, at 1300, configuring a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the method may also include, at 1305, determining a need to update a timing advance value applied by the user equipment.
  • the method may further include, at 1310, transmitting a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • the method may include, at 1315, receiving data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • the method may also include receiving a measurement report from the user equipment operating under the mobility setting.
  • the method may also include evaluating received measurements contained in the measurement report, determining that handover of the user equipment is needed, and requesting the user equipment to perform a cell change to a new cell.
  • the method may include assigning a new timing advance value to the user equipment, and instructing the user equipment to apply a new mobility setting.
  • FIG. 14 illustrates a set of apparatus 10 and 20 according to certain example embodiments.
  • the apparatus 10 may be an element in a communications network or associated with such a network, such as a UE, mobile equipment (ME), mobile station, mobile device, stationary device, loT device, or other device. It should be noted that one of ordinary skill in the art would understand that apparatus 10 may include components or features not shown in FIG. 14.
  • apparatus 10 may include one or more processors, one or more computer-readable storage medium (for example, memory, storage, or the like), one or more radio access components (for example, a modem, a transceiver, or the like), and/or a user interface.
  • apparatus 10 may be configured to operate using one or more radio access technologies, such as GSM, LTE, LTE-A, NR, 5G, WLAN, WiFi, NB-IoT, Bluetooth, NFC, MulteFire, and/or any other radio access technologies. It should be noted that one of ordinary skill in the art would understand that apparatus 10 may include components or features not shown in FIG. 1-12.
  • apparatus 10 may include or be coupled to a processor 12 for processing information and executing instructions or operations.
  • processor 12 may be any type of general or specific purpose processor.
  • processor 12 may include one or more of general- purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as examples. While a single processor 12 is shown in FIG. 14, multiple processors may be utilized according to other example embodiments.
  • apparatus 10 may include two or more processors that may form a multiprocessor system (e.g., in this case processor 12 may represent a multiprocessor) that may support multiprocessing.
  • processor 12 may represent a multiprocessor
  • the multiprocessor system may be tightly coupled or loosely coupled (e.g., to form a computer cluster).
  • Processor 12 may perform functions associated with the operation of apparatus 10 including, as some examples, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 10, including processes illustrated in FIGs. 1-12.
  • Apparatus 10 may further include or be coupled to a memory 14 (internal or external), which may be coupled to processor 12, for storing information and instructions that may be executed by processor 12.
  • Memory 14 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and/or removable memory.
  • memory 14 can be comprised of any combination of random access memory (RAM), read only memory (ROM), static storage such as a magnetic or optical disk, hard disk drive (HDD), or any other type of non-transitory machine or computer readable media.
  • the instructions stored in memory 14 may include program instructions or computer program code that, when executed by processor 12, enable the apparatus 10 to perform tasks as described herein.
  • apparatus 10 may further include or be coupled to (internal or external) a drive or port that is configured to accept and read an external computer readable storage medium, such as an optical disc, USB drive, flash drive, or any other storage medium.
  • an external computer readable storage medium such as an optical disc, USB drive, flash drive, or any other storage medium.
  • the external computer readable storage medium may store a computer program or software for execution by processor 12 and/or apparatus 10 to perform any of the methods illustrated in FIGs. 1-12.
  • apparatus 10 may also include or be coupled to one or more antennas 15 for receiving a downlink signal and for transmitting via an uplink from apparatus 10.
  • Apparatus 10 may further include a transceiver 18 configured to transmit and receive information.
  • the transceiver 18 may also include a radio interface (e.g., a modem) coupled to the antenna 15.
  • the radio interface may correspond to a plurality of radio access technologies including one or more of GSM, LTE, LTE-A, 5G, NR, WLAN, NB-IoT, Bluetooth, BT-LE, NFC, RFID, UWB, and the like.
  • the radio interface may include other components, such as filters, converters (for example, digital-to-analog converters and the like), symbol demappers, signal shaping components, an Inverse Fast Fourier Transform (IFFT) module, and the like, to process symbols, such as OFDMA symbols, carried by a downlink or an uplink.
  • transceiver 18 may be configured to modulate information on to a carrier waveform for transmission by the antenna(s) 15 and demodulate information received via the anteima(s) 15 for further processing by other elements of apparatus 10.
  • transceiver 18 may be capable of transmitting and receiving signals or data directly.
  • apparatus 10 may include an input and/or output device (I/O device).
  • apparatus 10 may further include a user interface, such as a graphical user interface or touchscreen.
  • memory 14 stores software modules that provide functionality when executed by processor 12.
  • the modules may include, for example, an operating system that provides operating system functionality for apparatus 10.
  • the memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 10.
  • the components of apparatus 10 may be implemented in hardware, or as any suitable combination of hardware and software.
  • apparatus 10 may optionally be configured to communicate with apparatus 20 via a wireless or wired communications link 70 according to any radio access technology, such as NR.
  • processor 12 and memory 14 may be included in or may form a part of processing circuitry or control circuitry.
  • transceiver 18 may be included in or may form a part of transceiving circuitry.
  • apparatus 10 may be controlled by memory 14 and processor 12 to receive, from a network element, configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • Apparatus 10 may also be controlled by memory 14 and processor 12 to apply the at least one mobility setting.
  • Apparatus 10 may further be controlled by memory 14 and processor 12 to evaluate at least one of a first timing advance value, a received time interval variation, or a frequency offset between the apparatus and the network element against the at least one parameter.
  • apparatus 10 may be controlled by memory 14 and processor 12 to switch from the at least one mobility setting to a second mobility setting based on the evaluation.
  • apparatus 20 may be a network, core network element, or element in a communications network or associated with such a network, such as gNB, SMF, PCF, or AF. It should be noted that one of ordinary skill in the art would understand that apparatus 20 may include components or features not shown in FIG. 14.
  • apparatus 20 may include a processor 22 for processing information and executing instructions or operations.
  • Processor 22 may be any type of general or specific purpose processor.
  • processor 22 may include one or more of general- purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as examples. While a single processor 22 is shown in FIG. 14, multiple processors may be utilized according to other example embodiments.
  • apparatus 20 may include two or more processors that may form a multiprocessor system (e.g., in this case processor 22 may represent a multiprocessor) that may support multiprocessing.
  • processor 22 may represent a multiprocessor
  • the multiprocessor system may be tightly coupled or loosely coupled (e.g., to form a computer cluster).
  • processor 22 may perform functions associated with the operation of apparatus 20, which may include, for example, preceding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 20, including processes illustrated in FIGs. 1-11 and 13.
  • Apparatus 20 may further include or be coupled to a memory 24 (internal or external), which may be coupled to processor 22, for storing information and instructions that may be executed by processor 22.
  • Memory 24 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and/or removable memory.
  • memory 24 can be comprised of any combination of random access memory (RAM), read only memory (ROM), static storage such as a magnetic or optical disk, hard disk drive (HDD), or any other type of non-transitory machine or computer readable media.
  • the instructions stored in memory 24 may include program instructions or computer program code that, when executed by processor 22, enable the apparatus 20 to perform tasks as described herein.
  • apparatus 20 may further include or be coupled to (internal or external) a drive or port that is configured to accept and read an external computer readable storage medium, such as an optical disc, USB drive, flash drive, or any other storage medium.
  • an external computer readable storage medium such as an optical disc, USB drive, flash drive, or any other storage medium.
  • the external computer readable storage medium may store a computer program or software for execution by processor 22 and/or apparatus 20 to perform the methods illustrated in FIGs. 1-11 and 13.
  • apparatus 20 may also include or be coupled to one or more antennas 25 for transmitting and receiving signals and/or data to and from apparatus 20.
  • Apparatus 20 may further include or be coupled to a transceiver 28 configured to transmit and receive information.
  • the transceiver 28 may include, for example, a plurality of radio interfaces that may be coupled to the anteima(s) 25.
  • the radio interfaces may correspond to a plurality of radio access technologies including one or more of GSM, NB- loT, LTE, 5G, WLAN, Bluetooth, BT-LE, NFC, radio frequency identifier (RFID), ultrawideband (UWB), MulteFire, and the like.
  • the radio interface may include components, such as filters, converters (for example, digital-to- analog converters and the like), mappers, a Fast Fourier Transform (FFT) module, and the like, to generate symbols for a transmission via one or more downlinks and to receive symbols (for example, via an uplink).
  • components such as filters, converters (for example, digital-to- analog converters and the like), mappers, a Fast Fourier Transform (FFT) module, and the like, to generate symbols for a transmission via one or more downlinks and to receive symbols (for example, via an uplink).
  • FFT Fast Fourier Transform
  • transceiver 28 may be configured to modulate information on to a carrier waveform for transmission by the anteima(s) 25 and demodulate information received via the anteima(s) 25 for further processing by other elements of apparatus 20.
  • transceiver 18 may be capable of transmitting and receiving signals or data directly.
  • apparatus 20 may include an input and/or output device (I/O device).
  • memory 24 may store software modules that provide functionality when executed by processor 22.
  • the modules may include, for example, an operating system that provides operating system functionality for apparatus 20.
  • the memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 20.
  • the components of apparatus 20 may be implemented in hardware, or as any suitable combination of hardware and software.
  • processor 22 and memory 24 may be included in or may form a part of processing circuitry or control circuitry.
  • transceiver 28 may be included in or may form a part of transceiving circuitry.
  • circuitry may refer to hardware-only circuitry implementations (e.g., analog and/or digital circuitry), combinations of hardware circuits and software, combinations of analog and/or digital hardware circuits with software/firmware, any portions of hardware processor(s) with software (including digital signal processors) that work together to cause an apparatus (e.g., apparatus 10 and 20) to perform various functions, and/or hardware circuit(s) and/or processor(s), or portions thereof, that use software for operation but where the software may not be present when it is not needed for operation.
  • an apparatus e.g., apparatus 10 and 20
  • circuitry may also cover an implementation of merely a hardware circuit or processor (or multiple processors), or portion of a hardware circuit or processor, and its accompanying software and/or firmware.
  • the term circuitry may also cover, for example, a baseband integrated circuit in a server, cellular network node or device, or other computing or network device.
  • apparatus 20 may be controlled by memory 24 and processor 22 to configure a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • Apparatus 20 may also be controlled by memory 24 and processor 22 to determine a need to update a timing advance value applied by the user equipment.
  • Apparatus 20 may further be controlled by memory 24 and processor 22 to transmit a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • apparatus 20 may be controlled by memory 24 and processor 22 to receive data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • an apparatus may include means for performing a method, a process, or any of the variants discussed herein.
  • the means may include one or more processors, memory, controllers, transmitters, receivers, and/or computer program code for causing the performance of the operations.
  • Certain example embodiments may be directed to an apparatus that includes means for performing any of the methods described herein including, for example, means for receiving, from a network element, configuration of at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the apparatus may also include means for applying the at least one mobility setting.
  • the apparatus may further include means for evaluating at least one of a first timing advance value, a time interval variation, or a frequency offset between the apparatus and the network element against the at least one parameter.
  • the apparatus may include means for switching from the at least one mobility setting to a second mobility setting based on the evaluation.
  • Certain example embodiments may also be directed to an apparatus that includes means for configuring a user equipment with at least one mobility setting and at least one parameter specifying at least one setting threshold for applying the at least one mobility setting.
  • the apparatus may also include means for determining a need to update a timing advance value applied by the user equipment.
  • the apparatus may further include means for transmitting a timing advance command to the user equipment specifying which of the at least one mobility setting should be applied by the user equipment.
  • the apparatus may include means for receiving data transmission from the user equipment operating under a mobility setting of the at least one motility setting.
  • Certain example embodiments described herein provide several technical improvements, enhancements, and /or advantages. For instance, in some example embodiments, it may be possible to ensure that the UE is applying the correct mobility setting set if the UE has been configured as such. In other example embodiments, it may be possible to mitigate mobility issues due to inappropriate/generic mobility configurations. In further example embodiments, it may be possible to provide higher mobility robustness, and provide adaptation of mobility settings in a cell to the concrete scenario and UE conditions. Further, in certain example embodiments, it may be possible to increase system efficiency due to the reduction of unnecessary mobility events.
  • a computer program product may include one or more computerexecutable components which, when the program is run, are configured to carry out some example embodiments.
  • the one or more computer-executable components may be at least one software code or portions of it. Modifications and configurations required for implementing functionality of certain example embodiments may be performed as routine(s), which may be implemented as added or updated software routine(s). Software routine(s) may be downloaded into the apparatus.
  • software or a computer program code or portions of it may be in a source code form, object code form, or in some intermediate form, and it may be stored in some sort of carrier, distribution medium, or computer readable medium, which may be any entity or device capable of carrying the program.
  • carrier may include a record medium, computer memory, read-only memory, photoelectrical and/or electrical carrier signal, telecommunications signal, and software distribution package, for example.
  • the computer program may be executed in a single electronic digital computer or it may be distributed amongst a number of computers.
  • the computer readable medium or computer readable storage medium may be a non-transitory medium.
  • the functionality may be performed by hardware or circuitry included in an apparatus (e.g., apparatus 10 or apparatus 20), for example through the use of an application specific integrated circuit (ASIC), a programmable gate array (PGA), a field programmable gate array (FPGA), or any other combination of hardware and software.
  • ASIC application specific integrated circuit
  • PGA programmable gate array
  • FPGA field programmable gate array
  • the functionality may be implemented as a signal, a non-tangible means that can be carried by an electromagnetic signal downloaded from the Internet or other network.
  • an apparatus such as a node, device, or a corresponding component, may be configured as circuitry, a computer or a microprocessor, such as single-chip computer element, or as a chipset, including at least a memory for providing storage capacity used for arithmetic operation and an operation processor for executing the arithmetic operation.

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Abstract

L'invention concerne des systèmes, des procédés, des appareils, et des produits-programmes d'ordinateur pour un changement de réglage de mobilité intelligent dans un environnement à changement rapide. Un procédé peut consister à recevoir, en provenance d'un élément de réseau, une configuration d'au moins un réglage de mobilité et au moins un paramètre spécifiant au moins un seuil de réglage pour appliquer l'au moins un réglage de mobilité. Le procédé peut également consister à appliquer l'au moins un réglage de mobilité. Le procédé peut en outre consister à évaluer une première valeur d'avance temporelle, et/ou une variation d'intervalle de temps reçue, et/ou un décalage de fréquence entre un équipement utilisateur et l'élément de réseau par rapport à l'au moins un paramètre. De plus, le procédé peut consister à commuter de l'au moins un réglage de mobilité à un second réglage de mobilité sur la base de l'évaluation
PCT/US2022/039623 2022-08-05 2022-08-05 Changements de réglage de mobilité intelligents dans un environnement à changement rapide WO2024030136A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012045337A1 (fr) * 2010-10-06 2012-04-12 Nokia Siemens Networks Oy Optimisation de la mobilité en rapport avec un transfert intercellulaire dans des systèmes de communication cellulaire
US20150119039A1 (en) * 2012-03-26 2015-04-30 Nokia Corporation Adaptation of mobility parameters based on user equipment measurement availability
EP3285520A1 (fr) * 2012-03-16 2018-02-21 BlackBerry Limited Détermination, par un équipement utilisateur (ue), d'un paramètre de temps à déclencheur pour une exécution de transfert d'appel dans un réseau hétérogène
US10455468B2 (en) * 2015-08-14 2019-10-22 Qualcomm Incorporated Mobility enhancements for high speed scenarios

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012045337A1 (fr) * 2010-10-06 2012-04-12 Nokia Siemens Networks Oy Optimisation de la mobilité en rapport avec un transfert intercellulaire dans des systèmes de communication cellulaire
EP3285520A1 (fr) * 2012-03-16 2018-02-21 BlackBerry Limited Détermination, par un équipement utilisateur (ue), d'un paramètre de temps à déclencheur pour une exécution de transfert d'appel dans un réseau hétérogène
US20150119039A1 (en) * 2012-03-26 2015-04-30 Nokia Corporation Adaptation of mobility parameters based on user equipment measurement availability
US10455468B2 (en) * 2015-08-14 2019-10-22 Qualcomm Incorporated Mobility enhancements for high speed scenarios

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