WO2020122796A1 - Mobilité conditionnelle dans un système de communication sans fil - Google Patents

Mobilité conditionnelle dans un système de communication sans fil Download PDF

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Publication number
WO2020122796A1
WO2020122796A1 PCT/SE2019/051255 SE2019051255W WO2020122796A1 WO 2020122796 A1 WO2020122796 A1 WO 2020122796A1 SE 2019051255 W SE2019051255 W SE 2019051255W WO 2020122796 A1 WO2020122796 A1 WO 2020122796A1
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WIPO (PCT)
Prior art keywords
conditional
conditions
configuration
different types
event
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PCT/SE2019/051255
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English (en)
Inventor
Icaro L. J. Da Silva
Johan Rune
Pradeepa Ramachandra
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2020122796A1 publication Critical patent/WO2020122796A1/fr

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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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • 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
    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength

Definitions

  • the present application relates generally to a wireless communication system, and relates more particularly to conditional mobility in such a system.
  • NR New Radio
  • Conditional mobility is one approach to improve mobility robustness in this regard.
  • a wireless device may be commanded to perform a mobility procedure, e.g., handover or resume, earlier than traditionally commanded, before the source radio link quality deteriorates below a certain threshold. But the wireless device is commanded to wait to perform that mobility procedure until the wireless device detects that a certain condition is fulfilled, e.g., the source radio link quality deteriorates even further below a different threshold. Once the device detects that condition, the device may autonomously perform the mobility procedure without receiving any other signaling on the source radio link, so that the procedure proves robust to source link deterioration.
  • conditional mobility approach can improve mobility robustness under some circumstances, it threatens to limit the sophistication and flexibility of the decision of when to perform a mobility procedure. This may in turn jeopardize the ability of the conditional mobility approach to avoid mobility failure and/or poor service performance.
  • a wireless device combines multiple conditions into a logical expression, e.g., using logical conjunction and/or logical disjunction, that the device evaluates for deciding whether to apply a conditional mobility configuration.
  • These two or more conditions may be based on signal measurements that are of different types, e.g., RSRP, RSRQ, and/or SINR, and/or that are performed on different types of signals, e.g., SSB and CSI-RS.
  • the device receives control signaling indicating parameter values for these multiple conditions, e.g., in terms of values for trigger quantities, hysteresis, and/or time-to-trigger.
  • some embodiments herein include a method performed by a wireless device.
  • the method in some embodiments includes receiving control signaling indicating multiple conditions to be combined into a logical expression that the wireless device is to evaluate for deciding whether to apply a conditional mobility configuration. Two or more of the conditions may be based on signal measurements that are of different types and/or that are performed on different types of signals.
  • the method also includes deciding, based on evaluation of the logical expression, whether to apply the conditional mobility configuration. The method may further include applying or not applying the conditional mobility configuration depending on said deciding.
  • said deciding comprises deciding to apply the conditional mobility configuration when the logical expression evaluates to true.
  • applying the conditional mobility configuration comprises performing a mobility procedure according to the conditional mobility configuration.
  • two or more of the conditions are based on signal measurements that are of different types.
  • the different types of signal measurements include two or more of: reference signal received power, RSRP, reference signal received quality, RSRQ, and signal-to-interference-plus-noise ratio, SINR.
  • the logical expression comprises a logical conjunction of two or more of the conditions.
  • control signaling indicates the configuration of an event, wherein two or more of the conditions are the occurrence of the event with respect to signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling indicates a list of different configurations for the same event, wherein two or more of the conditions are the occurrence of the same event as configured differently according to the different configurations.
  • the different configurations indicate different respective ones of the multiple conditions by indicating different respective values for a threshold or offset parameter based on which the event is defined, and two or more of the values are values for signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling indicates a list of measurement identifiers that are each associated with a respective measurement object and reporting configuration, wherein each reporting configuration indicates a respective one of the multiple conditions.
  • control signaling comprises a message that indicates the conditional mobility configuration.
  • the message is a radio resource control, RRC, reconfiguration message.
  • conditional mobility configuration is a
  • conditional handover a conditional resume
  • conditional reconfiguration with sync a conditional reconfiguration
  • conditional reconfiguration a conditional reconfiguration with sync
  • Embodiments further include a method performed by a network node.
  • the method may include transmitting, to a wireless device, control signaling indicating multiple conditions to be combined into a logical expression that the wireless device is to evaluate for deciding whether to apply a conditional mobility configuration. Two or more of the conditions may be based on signal measurements that are of different types and/or that are performed on different types of signals.
  • two or more of the conditions are based on signal measurements that are of different types.
  • the different types of signal measurements include two or more of: reference signal received power, RSRP, reference signal received quality, RSRQ, and signal-to-interference-plus-noise ratio, SINR.
  • the logical expression comprises a logical conjunction of two or more of the conditions.
  • control signaling indicates the configuration of an event, wherein two or more of the conditions are the occurrence of the event with respect to signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling indicates a list of different configurations for the same event, wherein two or more of the conditions are the occurrence of the same event as configured differently according to the different configurations.
  • the different configurations indicate different respective ones of the multiple conditions by indicating different respective values for a threshold or offset parameter based on which the event is defined, and two or more of the values are values for signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling indicates a list of measurement identifiers that are each associated with a respective measurement object and reporting configuration, wherein each reporting configuration indicates a respective one of the multiple conditions.
  • control signaling comprises a message that indicates the conditional mobility configuration.
  • the message is a radio resource control, RRC, reconfiguration message.
  • conditional mobility configuration is a
  • conditional handover a conditional resume
  • conditional reconfiguration with sync a conditional reconfiguration
  • conditional reconfiguration a conditional reconfiguration with sync
  • Embodiments may also include corresponding apparatus, computer programs, and carriers.
  • embodiments herein include a wireless device.
  • the wireless device in some embodiments is configured, e.g., via communication circuitry and processing circuitry, to receive control signaling indicating multiple conditions to be combined into a logical expression that the wireless device is to evaluate for deciding whether to apply a conditional mobility configuration. Two or more of the conditions may be based on signal measurements that are of different types and/or that are performed on different types of signals.
  • the wireless device is also configured to decide, based on evaluation of the logical expression, whether to apply the conditional mobility configuration.
  • the wireless device may further be configured to apply or not apply the conditional mobility configuration depending on said deciding.
  • Embodiments herein further include a network node.
  • the network node may be configured, e.g., via communication circuitry and processing circuitry, to transmit, to a wireless device, control signaling indicating multiple conditions to be combined into a logical expression that the wireless device is to evaluate for deciding whether to apply a conditional mobility configuration. Two or more of the conditions may be based on signal measurements that are of different types and/or that are performed on different types of signals.
  • Figure 1 is a block diagram of a wireless communication network according to some embodiments.
  • Figure 2A is a block diagram of control signaling according to some embodiments.
  • Figure 2B is a block diagram of control signaling according to other embodiments.
  • FIG. 2C is a block diagram of control signaling according to still other embodiments.
  • Figure 3 is a logic flow diagram of a method performed by a wireless device according to some embodiments.
  • Figure 4 is a logic flow diagram of a method performed by a network node according to some embodiments.
  • Figure 5 is a block diagram of a wireless device according to some embodiments.
  • Figure 6 is a block diagram of a network node according to some embodiments.
  • Figures 7 A and 7B are call flow diagrams of a handover procedure according to some embodiments.
  • Figure 8 is a call flow diagram of a conditional handover procedure according to some embodiments.
  • Figure 9 is a call flow diagram of a conditional resume procedure according to some embodiments.
  • Figure 10 is a block diagram of a wireless communication network according to some embodiments.
  • Figure 11 is a block diagram of a user equipment according to some embodiments.
  • Figure 12 is a block diagram of a virtualization environment according to some embodiments.
  • Figure 13 is a block diagram of a communication network with a host computer according to some embodiments.
  • Figure 14 is a block diagram of a host computer according to some embodiments.
  • Figure 15 is a flowchart illustrating a method implemented in a
  • Figure 16 is a flowchart illustrating a method implemented in a
  • Figure 17 is a flowchart illustrating a method implemented in a
  • Figure 18 is a flowchart illustrating a method implemented in a
  • Figure 1 illustrates a wireless communication network 10 according to one or more embodiments.
  • the network 10 e.g., a 5G network or New Radio, NR, network
  • the network 10 may include an access network (AN) 12 and a core network (CN) 14.
  • the AN 12 wirelessly connects a wireless communication device 16 (or simply “wireless device 16”) to the CN 14.
  • the CN 14 in turn connects the wireless device 16 to one or more external networks (not shown), such as a public switched telephone network and/or a packet data network, e.g., the Internet.
  • the AN 12 provides links via which the wireless device 16 may wirelessly access the network 10, e.g., using uplink and/or downlink communications.
  • the AN 12 may for example provide links 20-0, 20-1 ,...20-N (generally links 20) in the form of access nodes, e.g., base stations, cells, sectors, beams, carriers, or the like. Some links 20 may provide wireless coverage over different geographical areas.
  • the network 10 controls which link 20 the device 16 uses to access the network 10, e.g., in or for a so-called connected mode, which may for instance be a mode in which the device 16 has established a radio resource control, RRC, connection with the network 10, in contrast with an RRC idle mode in which no RRC connection is established.
  • the network 10 in this regard may transmit to the wireless device 16 a mobility configuration, e.g., an RRC configuration, that, when applied by the wireless device 16, configures the device 16 to use certain link(s) 20 to access the network 10.
  • a mobility configuration may for example configure the device 16 to perform a switch 24 from accessing the network 10 via one link to accessing the system via another link, e.g., in connected mode.
  • a mobility configuration may for example configure the device 16 to perform a switch 24 from accessing the network 10 via one link to accessing the system via another link, e.g., in connected mode.
  • this link switch 24 may be a handover.
  • a mobility configuration may configure the device 16 to use more or less links to access the network 10, e.g., in the context of dual connectivity, carrier aggregation, or the like.
  • the mobility configuration may be a configuration for adding a secondary cell group (SCG) or a secondary cell.
  • the mobility configuration may be a configuration for resuming a connection, e.g., an RRC connection resume, for a reconfiguration with sync, for a reconfiguration, for a reestablishment, or the like.
  • application by the wireless device 16 of a mobility configuration means that the wireless device 16 performs, i.e. , executes, a mobility procedure, e.g., a handover procedure, a resume procedure, etc.
  • the network 10 may transmit the mobility configuration to the wireless device 16 but indicate that the wireless device 16 is to only conditionally apply that mobility configuration. In this sense, then, the network 10 as shown in Figure 1 transmits to the wireless device 16 a so-called conditional mobility configuration 22 that is a mobility configuration that the wireless device 16 is to conditionally apply.
  • conditional application of the conditional mobility configuration 22 may notably be based on or otherwise depend on multiple conditions 28, rather than just a single condition.
  • two or more of these conditions 28 may be based on signal measurements that are of different types, e.g., two or more of: reference signal received power (RSRP), reference signal received quality (RSRQ), and signal-to-interference-plus-noise ratio (SINR).
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SINR signal-to-interference-plus-noise ratio
  • two or more of the conditions 28 may be based on signal measurements that are performed on different types of signals, e.g., two or more of: synchronization signal block (SSB), channel state information reference signal (CSI-RS), and tracking reference signal (TRS).
  • SSB synchronization signal block
  • CSI-RS channel state information reference signal
  • TRS tracking reference signal
  • two or more of the conditions 28 may be based on different types of events, e.g., an X3 event and an X1 event, or may be based on different configurations of the same type of event, e.g., different configurations of an X3 event.
  • the wireless device 16 in some embodiments is configured to combine the multiple conditions 28 into a logical expression 30, e.g., in the form of a logical conjunction, i.e., AND, of two or more of the conditions 28, a logical disjunction, i.e., OR, of two or more of the conditions 28, and/or any combination thereof so as to constitute a combination of multiple logical subexpressions.
  • the wireless device 16 may combine one condition that is fulfilled upon the occurrence of event X3 with respect to RSRP and another condition that is fulfilled upon the occurrence of event X3 with respect to RSRQ.
  • the device 16 may combine these conditions into a logical expression of the form (neighbor RSRP becomes x better than PCell) AND (neighbor RSRQ becomes x better than PCell), so as to effectively define a composite condition under which event X3 occurs with respect to both RSRP and RSRQ.
  • X3 event may be similar to the LTE and NR A3 event, except that its occurrence may be associated with triggering of a mobility decision instead of a measurement report.
  • the wireless device 16 may evaluate this logical expression 30 for making a mobility decision 32; that is, for deciding whether to apply the conditional mobility configuration 22.
  • the wireless device 16 in some embodiments, for example, decides to apply the conditional mobility configuration 22 when the logical expression 30 evaluates to TRUE.
  • conditional mobility configuration 22 may generally refer to the combination of a mobility configuration, e.g., an RRC configuration, and the conditions 28 or the logical expression 30.
  • application of the conditional mobility configuration 22 as used herein generally refers to application of the mobility configuration, e.g., RRC configuration, included in the conditional mobility configuration 22, e.g., as part of executing a mobility procedure.
  • the conditional mobility configuration 22 may be associated with a particular target link.
  • the network node 18 in the embodiments shown in Figure 1 may transmit to the wireless device 16 control signaling 26, e.g., in the form of an RRC message such as an RRC reconfiguration message or an RRC conditional reconfiguration message.
  • the control signaling 26 may include or otherwise indicate the conditional mobility configuration 22, either by itself or along with one or more other conditional mobility configurations (not shown), e.g., where different conditional mobility configurations are associated with different potential target links.
  • the control signaling 26 may, in a broad sense, indicate the multiple conditions 28 that the wireless device 16 is to combine into the logical expression 30 and/or may indicate the logical expression 30.
  • the control signaling 26 may alternatively or additionally indicate parameter values 26A for the multiple conditions 28.
  • the conditions 28 may each be defined by or otherwise be a function of one or more parameters, e.g., a threshold or offset parameter (also referred to as a trigger quantity parameter) associated with a type of signal measurement and/or a type of reference signal, a hysteresis parameter, and/or a time-to-trigger parameter.
  • a threshold or offset parameter also referred to as a trigger quantity parameter
  • the control signaling 26 may indicate the value(s) 26A for the parameter(s).
  • the control signaling 26 indicates parameter values 26A for the multiple conditions
  • the multiple conditions 28 include the occurrence of event X3 with respect to both RSRP and RSRQ.
  • the RSRP-based condition in this case may be fulfilled when the following inequality is fulfilled: Mn - Hys > Mp + Off , where Mn is the RSRP measurement result of the neighbor cell, Mp is the RSRP measurement result of the SpCell, Hys is a hysteresis parameter, and Off is an offset parameter.
  • the RSRQ-based condition may similarly be fulfilled when the same inequality is fulfilled with respect to RSRQ: Mn - Hys > Mp + Off , where Mn is the RSRQ measurement result of the neighbor cell, Mp is the RSRQ measurement result of the SpCell, Hys is a hysteresis parameter, and Off is an offset parameter.
  • the hysteresis parameter and the offset parameter may be common or independent for the different conditions.
  • the control signaling 26 may indicate values for the offset parameter and/or the hysteresis parameter for each of the RSRQ-based condition and the RSRP-based condition. Additional examples will be provided hereinafter with respect to events X1-X6.
  • the control signaling 26 may indicate the multiple conditions 28, the logical expression 30, and/or parameter values 26A to the wireless device 16 in any number of possible ways.
  • the control signaling 26 may indicate the configuration of an event (e.g., the configuration of an X3 event within the EventTriggerConfigForCHO information element).
  • the configuration of this event may indicate the multiple conditions 28 and/or parameter values 26A for the multiple conditions 28.
  • two or more of the conditions 28 may be the occurrence of the event with respect to signal
  • the configuration of the event configures a threshold or offset parameter 42 (also referred to as trigger quantity) based on which the event is defined.
  • the control signaling 26 indicates the configuration 40 of an event, which is defined by a threshold or offset parameter 42, e.g., a parameter x3-Offset of type MeasTriggerQuantityForCHO.
  • the configuration 40 nonetheless indicates, for each of the two or more conditions, a value 42-1 ,...42-N for the threshold or offset parameter 42.
  • each of the values 42-1...42-N may correspond to or define different ones of the conditions 28, such that multiple values 42-1...42-N are defined for the parameter 42 rather than just a single value. This may be accomplished for instance by defining the values for the parameter 42 in terms of a sequence of values, rather than a choice of a single value, e.g., MeasTriggerQuantityForCHO may be defined as a sequence of values, rather than a choice of a single value.
  • an inequality is a function of a threshold or offset parameter, e.g., the inequality Mn - Hys > Mp + Off used in the example above which includes an offset parameter Off.
  • two or more of the conditions 28 may be based on this same inequality, but with different values for the threshold or offset parameter, e.g., corresponding to signal measurements that are of different types and/or performed on different types of signals.
  • the logical expression 30 includes the logical conjunction of these conditions, the event may be considered to occur if the inequality is fulfilled for all of the values configured for the threshold or offset parameter.
  • control signaling 26 may indicate a list of different configurations 44-1...44-N for the same event, e.g., multiple configurations for event X3.
  • two or more of the conditions are the occurrence of the same event as configured differently according to the different configurations 44-1...44-N. Accordingly, where the logical expression 30 includes the logical conjunction of conditions corresponding to the different event
  • the device 16 must detect the occurrence of the event as configured according to all of those configurations.
  • the different configurations 44-1...44-N may indicate different respective ones of the multiple conditions 28 by indicating different respective values 46-1 , 48-1 for a threshold or offset parameter 46, 48 based on which the event is defined. That is, rather than a single event configuration defining multiple values for a threshold or offset parameter as in Figure 2A, multiple event configurations 44-1...44-N each define a single value 46-1 , 48-1 for the threshold or offset parameter 46, 48. But, according to some embodiments, two or more of the values are values for signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling 26 may indicate a list of measurement identifiers 50-1...50-N that are each associated with a respective measurement object and/or reporting configuration. Each reporting configuration indicates a respective one of the multiple conditions.
  • the embodiments may similarly extend to a hysteresis parameter and/or a time-to-trigger parameter.
  • control signalling 26 may comprise a message that not only conveys the conditions 28, the logical expression 30, and/or parameter values for the conditions 28, but also convey a single conditional mobility configuration.
  • control signalling 26 may be an RRC reconfiguration message.
  • control signalling 26 may indicate multiple conditional mobility configurations (e.g., as alternatives with respect to different links), including the conditional mobility configuration 22. That is, the control signalling 26 may indicate multiple conditional mobility configurations, one for each of multiple potential target links of a mobility procedure. In this case, the control signalling 26 may be a new RRC message referred to as an RRC conditional reconfiguration message. Where the control signaling 26 indicates multiple conditional mobility configurations, for example, the control signaling 26 may include a list of conditional mobility configurations, with each conditional mobility configuration comprising an identity, a mobility configuration, and conditions under which the mobility
  • conditional mobility configuration 22 may be a configuration for a conditional handover, a conditional resume, a conditional reconfiguration with sync, a conditional reconfiguration, or a conditional
  • conditional mobility configuration 22 may be a conditional configuration for secondary cell group, SCG, addition or secondary cell addition.
  • Figure 3 depicts a method performed by a wireless device 16 in accordance with particular embodiments.
  • the method as shown may include receiving control signaling 26 indicating multiple conditions 28 to be combined into a logical expression 30 that the wireless device 16 is to evaluate for deciding whether to apply a conditional mobility configuration 22 (Block 300).
  • the logical expression 30 may for instance comprise a logical conjunction of two or more of the conditions 28, a logical disjunction of two or more of the conditions 28, and/or comprise a combination of multiple logical
  • two or more of the conditions 28 are based on signal measurements that are of different types and/or that are performed on different types of signals.
  • the different types of signal are of different types and/or that are performed on different types of signals.
  • measurements may include two or more of: reference signal received power, RSRP, reference signal received quality, RSRQ, and signal-to-interference-plus-noise ratio, SINR.
  • the different types of signals may include two or more of: a synchronization signal block, SSB, a channel state information reference signal, CSI-RS, and a tracking reference signal, TRS.
  • control signaling 26 indicates parameter values 26A for the multiple conditions 28.
  • the parameter values 26A may include values for one or more of: an offset or threshold parameter; a hysteresis parameter; and a time-to-trigger parameter.
  • control signaling 26 indicates the configuration of an event, where two or more of the conditions 28 are the occurrence of the event with respect to signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling 26 indicates a value for a threshold or offset parameter based on which the event is defined.
  • An inequality may for instance be a function of the threshold or offset parameter, where the two or more of the conditions 28 are based on the same inequality but with different values for the threshold or offset parameter.
  • the logical expression 30 may comprise a logical conjunction of the two or more of the conditions 28, such that, if more than one value is configured for the threshold or offset parameter, the event is considered to occur if the inequality is fulfilled for all of the values.
  • the control signaling 26 may indicate a value for a hysteresis parameter based on which the event is defined.
  • the control signaling 26 may indicate a value for a time-to-trigger parameter based on which the event is defined.
  • control signaling 26 indicates a list of different configurations for the same event, where two or more of the conditions 28 are the occurrence of the same event as configured differently according to the different configurations.
  • the different configurations indicate different respective ones of the multiple conditions 28 by indicating different respective values for a threshold or offset parameter based on which the event is defined, where two or more of the values are values for signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling 26 indicates a list of measurement identifiers that are each associated with a respective measurement object and reporting configuration, where each reporting configuration indicates a respective one of the multiple conditions 28.
  • control signaling 26 comprises a message that indicates the conditional mobility configuration 22.
  • the message may for instance be a radio resource control, RRC, reconfiguration message.
  • control signaling 26 comprises a message that indicates multiple conditional mobility configurations, including said conditional mobility configuration 22.
  • the message may for instance be an RRC conditional reconfiguration message.
  • conditional mobility configuration 22 is a configuration for a conditional handover, a conditional resume, a conditional reconfiguration with sync, a conditional reconfiguration, or a conditional
  • conditional mobility configuration 22 is a conditional configuration for secondary cell group, SCG, addition or secondary cell addition.
  • the method as shown may also include deciding, based on evaluation of the logical expression 30, whether to apply the conditional mobility configuration 22 (Block 310).
  • the wireless device 16 may decide to apply the conditional mobility configuration 22 if or when the logical expression 30 evaluates to TRUE.
  • the method in some embodiments, may also include deciding, based on evaluation of the logical expression 30, whether to apply the conditional mobility configuration 22 (Block 310).
  • the wireless device 16 may decide to apply the conditional mobility configuration 22 if or when the logical expression 30 evaluates to TRUE.
  • embodiments may further include applying or not applying the conditional mobility configuration 22 depending on that deciding (Block 320). Where the conditional mobility configuration 22 is applied, this may for instance involve performing a mobility procedure (e.g., handover) according to the conditional mobility
  • the method as shown may also include actually performing the signal measurements on which the conditions 28 are based (Block 302).
  • the method may alternatively or additionally include combining the conditions 28 into the logical expression 30 (Block 306) and/or evaluating the logical expression 30 (Block 308).
  • Figure 4 depicts a method performed by a network node 18 (e.g., a base station) in accordance with other particular embodiments.
  • the method includes transmitting, to a wireless device 16, control signaling 26 indicating multiple conditions 28 to be combined into a logical expression 30 that the wireless device 16 is to evaluate for deciding whether to apply a conditional mobility configuration 22 (Block 410).
  • the logical expression 30 may for instance comprise a logical conjunction of two or more of the conditions 28, a logical disjunction of two or more of the conditions 28, and/or comprise a combination of multiple logical
  • two or more of the conditions 28 are based on signal measurements that are of different types and/or that are performed on different types of signals.
  • the different types of signal are of different types and/or that are performed on different types of signals.
  • measurements may include two or more of: reference signal received power, RSRP, reference signal received quality, RSRQ, and signal-to-interference-plus-noise ratio, SINR.
  • the different types of signals may include two or more of: a synchronization signal block, SSB, a channel state information reference signal, CSI-RS, and a tracking reference signal, TRS.
  • control signaling 26 indicates parameter values 26A for the multiple conditions 28.
  • the parameter values 26A may include values for one or more of: an offset or threshold parameter; a hysteresis parameter; and a time-to-trigger parameter.
  • control signaling 26 indicates the configuration of an event, where two or more of the conditions 28 are the occurrence of the event with respect to signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling 26 indicates a value for a threshold or offset parameter based on which the event is defined.
  • An inequality may for instance be a function of the threshold or offset parameter, where the two or more of the conditions 28 are based on the same inequality but with different values for the threshold or offset parameter.
  • the logical expression 30 may comprise a logical conjunction of the two or more of the conditions 28, such that, if more than one value is configured for the threshold or offset parameter, the event is considered to occur if the inequality is fulfilled for all of the values.
  • the control signaling 26 may indicate a value for a hysteresis parameter based on which the event is defined.
  • the control signaling 26 may indicate a value for a time-to-trigger parameter based on which the event is defined.
  • control signaling 26 indicates a list of different configurations for the same event, where two or more of the conditions 28 are the occurrence of the same event as configured differently according to the different configurations.
  • the different configurations indicate different respective ones of the multiple conditions 28 by indicating different respective values for a threshold or offset parameter based on which the event is defined, where two or more of the values are values for signal measurements that are of different types and/or that are performed on different types of signals.
  • control signaling 26 indicates a list of measurement identifiers that are each associated with a respective measurement object and reporting configuration, where each reporting configuration indicates a respective one of the multiple conditions 28.
  • control signaling 26 comprises a message that indicates the conditional mobility configuration 22.
  • the message may for instance be a radio resource control, RRC, reconfiguration message.
  • control signaling 26 comprises a message that indicates multiple conditional mobility configurations, including said conditional mobility configuration 22.
  • the message may for instance be an RRC conditional reconfiguration message.
  • conditional mobility configuration 22 is a configuration for a conditional handover, a conditional resume, a conditional reconfiguration with sync, a conditional reconfiguration, or a conditional
  • conditional mobility configuration 22 is a conditional configuration for secondary cell group, SCG, addition or secondary cell addition.
  • the method as shown may also include generating the control signaling 26, e.g., according to any of the embodiments described herein (Block 406).
  • the method may further include deciding that the wireless device 16 is to conditionally apply the conditional mobility configuration 22, e.g., by making a conditional handover decision (Block 402).
  • inventions herein may include a method performed by a wireless device 16.
  • the method may include combining multiple conditions into a logical expression that the wireless device 16 is to evaluate for deciding whether to apply a conditional mobility configuration.
  • two or more of the conditions are based on signal measurements that are of different types and/or that are performed on different types of signals.
  • the method may further comprise deciding, based on evaluation of the logical expression, whether to apply the conditional mobility configuration.
  • the method may also comprise applying or not applying the conditional mobility configuration depending on said deciding.
  • Embodiments herein also include corresponding apparatuses.
  • Embodiments herein for instance include a wireless device 16 configured to perform any of the steps of any of the embodiments described above for the wireless device 16.
  • Embodiments also include a wireless device 16 comprising processing circuitry and power supply circuitry.
  • the processing circuitry is configured to perform any of the steps of any of the embodiments described above for the wireless device 16.
  • the power supply circuitry is configured to supply power to the wireless device 16.
  • Embodiments further include a wireless device 16 comprising processing circuitry.
  • the processing circuitry is configured to perform any of the steps of any of the embodiments described above for the wireless device 16.
  • the wireless device 16 further comprises communication circuitry.
  • Embodiments further include a wireless device 16 comprising processing circuitry and memory.
  • the memory contains instructions executable by the processing circuitry whereby the wireless device 16 is configured to perform any of the steps of any of the embodiments described above for the wireless device 16.
  • Embodiments moreover include a user equipment (UE).
  • the UE comprises an antenna configured to send and receive wireless signals.
  • the UE also comprises radio front-end circuitry connected to the antenna and to processing circuitry, and configured to condition signals communicated between the antenna and the processing circuitry.
  • the processing circuitry is configured to perform any of the steps of any of the embodiments described above for the wireless device 16.
  • the UE also comprises an input interface connected to the processing circuitry and configured to allow input of information into the UE to be processed by the processing circuitry.
  • the UE may comprise an output interface connected to the processing circuitry and configured to output information from the UE that has been processed by the processing circuitry.
  • the UE may also comprise a battery connected to the processing circuitry and configured to supply power to the UE.
  • Embodiments herein also include a network node 18 configured to perform any of the steps of any of the embodiments described above for the network node 18.
  • Embodiments also include a network node 18 comprising processing circuitry and power supply circuitry.
  • the processing circuitry is configured to perform any of the steps of any of the embodiments described above for the network node 18.
  • the power supply circuitry is configured to supply power to the network node 18.
  • Embodiments further include a network node 18 comprising processing circuitry.
  • the processing circuitry is configured to perform any of the steps of any of the embodiments described above for the network node 18.
  • the network node 18 further comprises communication circuitry.
  • Embodiments further include a network node 18 comprising processing circuitry and memory.
  • the memory contains instructions executable by the processing circuitry whereby the network node 18 is configured to perform any of the steps of any of the embodiments described above for the network node 18.
  • the apparatuses described above may perform the methods herein and any other processing by implementing any functional means, modules, units, or circuitry.
  • the apparatuses comprise respective circuits or circuitry configured to perform the steps shown in the method figures.
  • the circuits or circuitry in this regard may comprise circuits dedicated to performing certain functional processing and/or one or more microprocessors in conjunction with memory.
  • the circuitry may include one or more microprocessor or microcontrollers, as well as other digital hardware, which may include digital signal processors (DSPs), special-purpose digital logic, and the like.
  • DSPs digital signal processors
  • the processing circuitry may be configured to execute program code stored in memory, which may include one or several types of memory such as read only memory (ROM), random-access memory, cache memory, flash memory devices, optical storage devices, etc.
  • Program code stored in memory may include program instructions for executing one or more telecommunications and/or data communications protocols as well as instructions for carrying out one or more of the techniques described herein, in several embodiments.
  • the memory stores program code that, when executed by the one or more processors, carries out the techniques described herein.
  • FIG. 5 for example illustrates a wireless device 500, e.g., wireless device 16, as implemented in accordance with one or more embodiments.
  • the wireless device 500 includes processing circuitry 510 and communication circuitry 520 (abbreviated as“comm circuitry”).
  • the communication circuitry 520 e.g., radio circuitry, is configured to transmit and/or receive information to and/or from one or more other nodes, e.g., via any communication technology. Such communication may occur via one or more antennas that are either internal or external to the wireless device 500.
  • the processing circuitry 510 is configured to perform processing described above, e.g., in Figure 3, such as by executing instructions stored in memory 530 (abbreviated as“mem”).
  • the processing circuitry 510 in this regard may implement certain functional means, units, or modules.
  • FIG. 6 illustrates a network node 600, e.g., network node 18, as implemented in accordance with one or more embodiments.
  • the network node 600 includes processing circuitry 610 and communication circuitry 620 (abbreviated as“comm circuitry”).
  • the communication circuitry 620 is configured to transmit and/or receive information to and/or from one or more other nodes, e.g., via any communication technology.
  • the processing circuitry 610 is configured to perform processing described above, e.g., in Figure 4, such as by executing instructions stored in memory 630 (abbreviated as“mem”).
  • the processing circuitry 610 in this regard may implement certain functional means, units, or modules.
  • a computer program comprises instructions which, when executed on at least one processor of an apparatus, cause the apparatus to carry out any of the respective processing described above.
  • a computer program in this regard may comprise one or more code modules corresponding to the means or units described above.
  • Embodiments further include a carrier containing such a computer program.
  • This carrier may comprise one of an electronic signal, optical signal, radio signal, or computer readable storage medium.
  • embodiments herein also include a computer program product stored on a non-transitory computer readable (storage or recording) medium and comprising instructions that, when executed by a processor of an apparatus, cause the apparatus to perform as described above.
  • Embodiments further include a computer program product comprising program code portions for performing the steps of any of the embodiments herein when the computer program product is executed by a computing device.
  • This computer program product may be stored on a computer readable recording medium.
  • the wireless device 16 may be exemplified as a user equipment (UE), and the network node 18 may be exemplified as a base station, e.g., in the form of an eNB or gNB.
  • UE user equipment
  • gNB base station
  • An RRC_CONNECTED user equipment (UE) in Long Term Evolution (LTE) (also called EUTRA) can be configured by the network to perform measurements and, upon triggering measurement reports the network may send a handover command to the UE (in LTE an RRConnectionReconfiguration with a field called mobilityControllnfo and in New Radio (NR) an RRCReconfiguration with a reconfiguration With Sync field) .
  • LTE Long Term Evolution
  • EUTRA New Radio
  • that reconfiguration provided by the target cell contains all of the information the UE needs to access the target cell, e.g., random access configuration, a new Cell Radio Network Temporary Identity (C-RNTI) assigned by the target cell and security parameters enabling the UE to calculate new security keys associated to the target cell so the UE can send a handover complete message on Signaling Radio Bearer #1 (SRB1) (encrypted and integrity protected) based on new security keys upon accessing the target cell.
  • C-RNTI Cell Radio Network Temporary Identity
  • SRB1 Signaling Radio Bearer #1
  • Figure 7 A and 7B summarize the flow signalling between UE, source node and target node during a handover procedure.
  • Step 1 The UE context within the source gNB contains information regarding roaming and access restrictions which were provided either at connection establishment or at the last timing advance (TA) update.
  • TA timing advance
  • Step 1 The source gNB configures the UE measurement procedures and the UE reports according to the measurement configuration.
  • Step 2 The source gNB decides to handover the UE, based on MeasurementReport and Radio Resource Management (RRM) information.
  • RRM Radio Resource Management
  • the source gNB issues a Handover Request message to the target gNB passing a transparent RRC container with necessary information to prepare the handover at the target side.
  • the information includes at least the target cell ID, KgNB*, the Cell Radio Network Temporary Identity (C-RNTI) of the UE in the source gNB, RRM-configuration including UE inactive time, basic AS-configuration including antenna Info and DL Carrier Frequency, the current QoS flow to Data Radio Bearer (DRB) mapping rules applied to the UE, the System Information Block #1 (SI Bl) from source gNB, the UE capabilities for different Radio Access Technologies (RATs), Protocol Data Unit (PDU) session related information, and can include the UE reported measurement information including beam- related information if available.
  • SI Bl System Information Block #1
  • RATs Radio Access Technologies
  • PDU Protocol Data Unit
  • the PDU session related information includes the slice information (if supported) and QoS flow level QoS profile(s).
  • the source gNB should not reconfigure the UE, including performing Reflective QoS flow to DRB mapping.
  • Step 4 Admission Control may be performed by the target gNB. Slice-aware admission control shall be performed if the slice information is sent to the target gNB. If the PDU sessions are associated with non-supported slices the target gNB shall reject such PDU Sessions.
  • Step 5 The target gNB prepares the handover with L1/L2 and sends the
  • HANDOVER REQUEST ACKNOWLEDGE to the source gNB which includes a transparent container to be sent to the UE as an RRC message to perform the handover.
  • Step 6 The source gNB triggers the Uu handover by sending an
  • RRCReconfiguration message to the UE, containing the information required to access the target cell: at least the target cell ID, the new C-RNTI, the target gNB security algorithm identifiers for the selected security algorithms. It can also include a set of dedicated Random Access Channel (RACH) resources, the association between RACH resources and Synchronization Signal Block(s) (SSB(s)), the association between RACH resources and UE-specific Channel State Information Reference Signal (CSI-RS) configuration(s), common RACH resources, and system information of the target cell, etc.
  • RACH Random Access Channel
  • SSB(s) Synchronization Signal Block
  • CSI-RS Channel State Information Reference Signal
  • Step 7 The source gNB sends the SN STATUS TRANSFER message to the target gNB.
  • Step 8 The UE synchronises to the target cell and completes the RRC handover procedure by sending RRCReconfigurationComplete message to target gNB.
  • Step 9 The target gNB sends a PATH SWITCH REQUEST message to Access and Mobility Function (AMF) to trigger 5G Core (5GC) to switch the downlink (DL) data path towards the target gNB and to establish an NG-C interface instance towards the target gNB.
  • AMF Access and Mobility Function
  • 5GC 5G Core
  • Step 10 5GC switches the DL data path towards the target gNB.
  • the User Plane Function (UPF) sends one or more "end marker" packets on the old path to the source gNB per PDU session/tunnel and then can release any U-plane/TNL resources towards the source gNB.
  • UPF User Plane Function
  • Step 11 The AM F confirms the PATH SWITCH REQUEST message with the PATH SWITCH REQUEST ACKNOWLEDGE message.
  • Step 12 Upon reception of the PATH SWITCH REQUEST ACKNOWLEDGE message from the AMF, the target gNB sends the UE CONTEXT RELEASE to inform the source gNB about the success of the handover. The source gNB can then release radio and C-plane related resources associated to the UE context. Any ongoing data forwarding may continue.
  • Mobility in RRC_CONNECTED is network- based as the network has the best information regarding the current situation such as load conditions, resources in different nodes, available frequencies, etc.
  • the network can also take into account the situation of many UEs in the network, for a resource allocation perspective.
  • the network prepares a target cell before the UE accesses that cell.
  • the source cell provides the UE with the RRC configuration to be used in the target cell, including SRB1 configuration to send handover (HO) complete.
  • the UE is provided by the target cell with a target C-RNTI i.e.
  • the target identifies UE from Message 3 (MSG.3) on the Medium Access Control (MAC) level for the HO complete message.
  • the network provides needed information on how to access the target, e.g. Random Access Channel (RACH) configuration, so the UE does not have to acquire System Information (SI) prior to the handover.
  • the UE may be provided with contention-free random access (CFRA) resources, i.e. in that case the target cell identifies the UE from the preamble (MSG.1).
  • CFRA contention-free random access
  • the principle behind this is that the procedure can always be optimized with dedicated resources.
  • conditional handover (CHO), that might be a bit tricky as there is uncertainty about the final target but also the timing.
  • Security is prepared before the UE accesses the target cell i.e. Keys must be refreshed before sending RRC Connection
  • RRCReconfiguration with a reconfiguration With Sync f i e I d is normally sent when the radio conditions for the UE are already quite bad. That may lead to that the HO Command may not reach the UE in time if the message is segmented or there are retransmissions.
  • One solution to increase mobility robustness in NR is called“conditional handover” or“early handover command”. In order to avoid the undesired
  • the possibility to provide RRC signaling for the handover to the UE earlier is provided.
  • the UE executes the handover in accordance with the provided handover command.
  • Such a condition could e.g. be that the quality of the target cell or beam becomes X dB stronger than the serving cell.
  • the threshold Y used in a preceding measurement reporting event should then be chosen lower than the one in the handover execution condition. This allows the serving cell to prepare the handover upon reception of an early measurement report and to provide the
  • RRCConnectionReconfiguration with mobilityControllnfo at a time when the radio link between the source cell and the UE is still stable.
  • the execution of the handover is done at a later point in time (and threshold) which is considered optimal for the handover execution.
  • FIG 8 depicts an example with just a serving cell and a target cell.
  • RRM radio resource management
  • the network should then have the freedom to issue conditional handover commands for several of those candidates.
  • RRCConnectionReconfiguration for each of those candidates may differ, e.g. in terms of the HO execution condition (reference signal, RS, to measure and threshold to exceed) as well as in terms of the random access (RA) preamble to be sent when a condition is met.
  • RS reference signal
  • RA random access
  • the UE determines that the condition is fulfilled, it disconnects from the serving cell, applies the conditional HO command and connects to the target cell.
  • the serving gNB may exchange user plane (UP) data with the UE.
  • the UE sends a measurement report with a“low” threshold to the serving gNB.
  • the serving gNB makes a handover (HO) decision based on this early report.
  • the serving gNB sends an early HO request to a target gNB.
  • the target gNB accepts the HO request and builds an RRC configuration.
  • the target gNB returns a HO acknowledgement, including the RRC configuration, to the serving gNB in step 3.
  • a conditional HO command with a“high” threshold is sent to the UE. Subsequently, measurements by the UE may fulfil the HO condition of the conditional HO command.
  • the UE thus triggers the pending conditional handover.
  • the UE performs synchronization and random access with the target gNB in step 5, and HO confirm is exchanged in step 6.
  • the target gNB informs the serving gNB that HO is completed.
  • the target gNB may then exchange user plane (UP) data with the UE.
  • UP user plane
  • An alternative solution relies on context fetching called where a condition is also provided to the UE and, upon the fulfilment of the condition the UE executes resume.
  • a method is executed by a UE in RRC connected mode, the method comprising: receiving a message containing at least one condition from the network and monitoring the fulfilment of the provided condition, and, upon the fulfilment of a condition triggering an RRC Resume procedure or an equivalent procedure towards at least one target cell. That may be summarized by the flow diagram shown in Figure 9, which summarizes signalling between a UE, serving node (in this example a serving gNB) and target node (in this example a target gNB) during a conditional RRC Resume procedure.
  • serving node in this example a serving gNB
  • target node in this example a target gNB
  • the serving gNB may exchange user plane (UP) data with the UE.
  • the UE sends a measurement report with a“low” threshold to the serving gNB.
  • the serving gNB makes a HO decision based on this early report.
  • the serving gNB sends an early HO request to a target gNB.
  • the target gNB accepts the HO request.
  • the target gNB returns a HO acknowledgement to the serving gNB in step 3.
  • a conditional HO command with a“high” threshold is sent to the UE.
  • measurements by the UE may fulfil the HO condition of the conditional HO command.
  • the UE thus triggers the pending conditional handover.
  • the UE performs synchronization and random access with the target gNB in step 5, and in step 6 sends a RRCConnectionResumeRequest message to the target gNB.
  • the target gNB may then exchange user plane data with the UE.
  • conditional handover and conditional resume may be considered as a conditional mobility procedure.
  • handover decisions or PSCell change decisions are typically taken based on the coverage and quality of a serving cell compared to the quality of a potential neighbour.
  • Quality is typically measured in terms of Reference Signal Received Quality (RSRQ) or Signal-to-Noise Ratio (SINR), while coverage is typically measured based on RSRP.
  • RSS Reference Signal Received Quality
  • SINR Signal-to-Noise Ratio
  • the network In LTE and NR, only a single trigger quantity may be configured heretofore per measurement identifier / event.
  • the network wants to trigger a handover only when both quality and coverage are better in a neighbour cell compared to the source (e.g. PCell and/or PSCell), the network must configure the UE with at least two measurements identifiers, where each is associated with its own trigger quantity but possibly the same reportConfig (e.g. A3 event) and same measurement object.
  • ReportConfigNR a single trigger quantity is used for the configuration of the triggering conditions for measurement reporting, which is considered as baseline for the triggering conditions for conditional handover or mobility in general.
  • the trigger quantity is configured via the field a3-offset of type/IE MeasTriggerQuantityOffset which is a CHOICE structure i.e. network can only configure one per event.
  • the Information Element (IE) ReportConfigNR specifies criteria for triggering of an NR measurement reporting event. Measurement reporting events are based on cell measurement results, which can either be derived based on Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block or Channel State Information Reference Signal (CSI-RS). These events are labelled AN with N equal to 1 , 2 and so on.
  • SS Synchronization Signal
  • PBCH Physical Broadcast Channel
  • CSI-RS Channel State Information Reference Signal
  • Event A1 Serving becomes better than absolute threshold
  • Event A2 Serving becomes worse than absolute threshold
  • Event A3 Neighbour becomes amount of offset better than PCell/PSCell; Event A4: Neighbour becomes better than absolute threshold;
  • Neighbour/SCell becomes better than another absolute threshold2.
  • Event A6 Neighbour becomes amount of offset better than SCell.
  • EventT riggered EventT riggerConfig reported ReportCGI
  • EventT riggerConfig: : SEQUENCE ⁇
  • NR-RS-Type :: ENUMERATED ⁇ ssb, csi-rs ⁇
  • ASN 1STOP This choice can be RSRP, RSRQ or SINR.
  • RSRQ RSRQ
  • SINR SINR
  • radio resource management (RRM) measurements are performed based on cell-specific reference signals, also called CRSs.
  • CRSs cell-specific reference signals
  • RS reference signal
  • a single RS type may be configured per event.
  • a single measurement quantity like RSRP, RSRQ or SINR
  • the network may either configure CSI-RS or SS/PBCH Block (SSB) as RS type. Further details on CSI-RS and SSBs are provided in the measurement configuration.
  • CSI-RS and SSBs are provided in the measurement configuration.
  • quantities are defined per RS type such as SS-RSRP, SS-RSRQ, SS- SINR, CSI-RSRP, CSI-RSRQ, CSI-SINR, referring to the measurement quantity for a given RS type.
  • SS reference signal received power is defined as the linear average over the power contributions (in Watts, W) of the resource elements that carry secondary synchronization signals (SS).
  • the measurement time resource(s) for SS-RSRP are confined within SS/PBCH Block Measurement Time Configuration (SMTC) window duration. If SS-RSRP is used for L1-RSRP as configured by reporting configurations as defined in 3GPP TS 38.214 v15.3.0, the measurement time resources(s) restriction by SMTC window duration is not applicable.
  • demodulation reference signals for physical broadcast channel (PBCH) and, if indicated by higher layers may be used.
  • SS-RSRP using demodulation reference signal for PBCH or CSI reference signal shall be measured by linear averaging over the power contributions of the resource elements that carry corresponding reference signals taking into account power scaling for the reference signals as defined in 3GPP TS 38.213 v15.3.0. If SS-RSRP is not used for L1- RSRP, the additional use of CSI reference signals for SS-RSRP determination is not applicable.
  • SS-RSRP shall be measured only among the reference signals
  • SS-RSRP is measured only from the indicated set of SS/PBCH block(s).
  • the reference point for the SS-RSRP shall be the antenna connector of the UE.
  • SS-RSRP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch.
  • the reported SS-RSRP value shall not be lower than the corresponding SS- RSRP of any of the individual receiver branches.
  • RRC_CONNECTED intra-frequency If SS-RSRP is used for L1-RSRP, RRC_CONNECTED intra-frequency. Otherwise, RRCJDLE intra-frequency, RRCJDLE inter-frequency, RRCJNACTIVE intra-frequency, RRCJNACTIVE inter frequency, RRC_CONNECTED intra-frequency, and RRC_CONNECTED inter frequency.
  • the power per resource element is determined from the energy received during the useful part of the symbol, excluding the CP.
  • CSI reference signal received power is defined as the linear average over the power contributions (in Watts, W) of the resource elements that carry CSI reference signals configured for RSRP
  • CSI reference signals transmitted on antenna port 3000 according to 3GPP TS 38.211 v15.3.0 shall be used. If CSI-RSRP is used for L1-RSRP, CSI reference signals transmitted on antenna ports 3000, 3001 can be used for CSI-RSRP determination.
  • UE For intra-frequency CSI-RSRP measurements, if the measurement gap is not configured, UE is not expected to measure the CSI-RS resource(s) outside of the active downlink bandwidth part.
  • the reference point for the CSI-RSRP shall be the antenna connector of the UE.
  • CSI-RSRP shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch.
  • the reported CSI-RSRP value shall not be lower than the corresponding CSI- RSRP of any of the individual receiver branches.
  • the power per resource element is determined from the energy received during the useful part of the symbol, excluding the CP.
  • SS reference signal received quality is defined as the ratio of NxSS-RSRP / NR carrier RSSI, where N is the number of resource blocks in the NR carrier RSSI measurement bandwidth.
  • the measurements in the numerator and denominator shall be made over the same set of resource blocks.
  • NR carrier Received Signal Strength Indicator comprises the linear average of the total received power (in Watts, W) observed only in certain OFDM symbols of measurement time resource(s), in the measurement bandwidth, over N number of resource blocks from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc.
  • the measurement time resource(s) for NR Carrier RSSI are confined within SS/PBCH Block Measurement Time Configuration (SMTC) window duration. If indicated by higher-layers, the NR Carrier RSSI is measured in slots within a half frame with SS/PBCH blocks that are indicated by the higher layer parameter measurementSlots and in OFDM symbols given by Table 5.1.3-1.
  • NR Carrier RSSI is measured with timing reference corresponding to the serving cell in the frequency layer.
  • NR Carrier RSSI is measured with timing reference corresponding to any cell in the target frequency layer,
  • NR Carrier RSSI is measured from OFDM symbols within SMTC window duration and, if measurement gap is used, NR Carrier RSSI is measured from OFDM symbols corresponding to overlapped time span between SMTC window duration and minimum measurement time within the measurement gap.
  • SS-RSRP is measured only from the indicated set of SS/PBCH block(s).
  • the reference point for the SS-RSRQ shall be the antenna connector of the UE.
  • NR Carrier RSSI shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch, where the combining for NR Carrier RSSI shall be the same as the one used for SS-RSRP measurements.
  • the reported SS-RSRQ value shall not be lower than the corresponding SS-RSRQ of any of the individual receiver branches.
  • RRCJDLE intra-frequency RRCJDLE inter frequency
  • RRCJN ACTIVE intra-frequency RRCJNACTIVE inter-frequency
  • RRC_CONNECTED intra-frequency RRC_CONNECTED inter-frequency.
  • CSI reference signal received quality is defined as the ratio of N*CSI-RSRP to CSI-RSSI, where N is the number of resource blocks in the CSI-RSSI measurement bandwidth. The measurements in the numerator and denominator shall be made over the same set of resource blocks.
  • CSI Received Signal Strength Indicator comprises the linear average of the total received power (in Watts, W) observed only in OFDM symbols of measurement time resource(s), in the measurement bandwidth, over N number of resource blocks from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise etc.
  • the measurement time resource(s) for CSI-RSSI corresponds to OFDM symbols containing configured CSI- RS occasions.
  • CSI-RSRQ determination For CSI-RSRQ determination CSI reference signals transmitted on antenna port 3000 according to 3GPP TS 38.211 v15.3.0 shall be used.
  • UE For intra-frequency CSI-RSRQ measurements, if the measurement gap is not configured, UE is not expected to measure the CSI-RS resource(s) outside of the active downlink bandwidth part.
  • the reference point for the CSI-RSRQ shall be the antenna connector of the UE.
  • CSI-RSSI shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch, where the combining for CSI-RSSI shall be the same as the one used for CSI-RSRP measurements.
  • the reported CSI-RSRQ value shall not be lower than the corresponding CSI-RSRQ of any of the individual receiver branches.
  • This definition is applicable for RRC_CONNECTED intra-frequency, and RRC_CONNECTED inter-frequency.
  • SS signal-to-noise and interference ratio is defined as the linear average over the power contribution (in Watts, W) of the resource elements carrying secondary synchronisation signals divided by the linear average of the noise and interference power contribution (in Watts, W) over the resource elements carrying secondary synchronisation signals within the same frequency bandwidth.
  • the measurement time resource(s) for SS-SINR are confined within SS/PBCH Block Measurement Time Configuration (SMTC) window duration.
  • PBCH physical broadcast channel
  • secondary synchronization signals may be used.
  • SS-SINR is measured only from the indicated set of SS/PBCH block(s).
  • the reference point for the SS-SINR shall be the antenna connector of the UE.
  • SS-SINR shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch.
  • the reported SS-SINR value shall not be lower than the corresponding SS-SINR of any of the individual receiver branches.
  • This definition is applicable for RRC_CONNECTED intra-frequency and RRC_CONNECTED inter-frequency.
  • CSI signal-to-noise and interference ratio is defined as the linear average over the power contribution (in Watts, W) of the resource elements carrying CSI reference signals divided by the linear average of the noise and interference power contribution (in Watts, W) over the resource elements carrying CSI reference signals reference signals within the same frequency bandwidth.
  • CSI-SINR determination CSI reference signals transmitted on antenna port 3000 according to 3GPP TS 38.211 v15.3.0 shall be used.
  • UE For intra-frequency CSI-SINR measurements, if the measurement gap is not configured, UE is not expected to measure the CSI-RS resource(s) outside of the active downlink bandwidth part.
  • the reference point for the CSI-SINR shall be the antenna connector of the UE.
  • CSI-SINR shall be measured based on the combined signal from antenna elements corresponding to a given receiver branch.
  • the reported CSI-SINR value shall not be lower than the corresponding CSI- SINR of any of the individual receiver branches.
  • This definition is applicable for RRC_CONNECTED intra-frequency and RRC_CONNECTED inter-frequency.
  • the network takes handover decisions based on measurement reports and based on conditions of multiple quantities, for example, RSRP and RSRQ.
  • the network may configure the UE to report multiple measurement quantities in the same event configuration, by choosing a single trigger quantity, but multiple reporting quantities.
  • only a single trigger quantity fulfilling the configured condition may be configured and, despite that possibility, the network would have to anyway wait for a second type of measurement report where the second quantity triggers the report, reflecting the fact that this second trigger quantity fulfils its condition for measurement reporting.
  • the network configures the UE with two measurement identifiers for the same event (i.e. same reportConfig), each with a different trigger quantity, for example, one with RSRP and another with RSRQ (but possibly the same event i.e. reportConfig and same measurement object). Then, UE monitors both conditions at the same time (for the same measurement object and with the same event configuration) and, when at least one condition is fulfilled the UE starts to send measurement reports, possibly including both quantities RSRP and RSRQ. If only one condition for one of the quantities is triggered, despite the inclusion of both quantities the network still waits for the second type of report (when the second condition is fulfilled) before it takes a handover decision.
  • the network configures the UE with two measurement identifiers for the same event (i.e. same reportConfig), each with a different trigger quantity, for example, one with RSRP and another with RSRQ (but possibly the same event i.e. reportConfig and same measurement object). Then, UE monitors both conditions at
  • the network configures the UE with the following measurement identifiers:
  • measld(1) [reportConfig A3 for RSRP, measObject for frequency X]
  • measld(2) [reportConfig A3 for RSRQ, measObject for frequency X]
  • both conditions will be monitored in parallel and UE will perform both RSRP and RSRQ measurements on serving cell(s) and on the frequency X.
  • the UE Upon the triggering of the first condition, the UE sends a measurement report for measld(1), but network does not take any decision until it receives a measurement report for measld(2) as well.
  • the network needs to configure which RS type is used for each triggering quantity. That is also a CHOICE structure so that if network wants to take handover decisions based on the quality/coverage of SSBs and CSI- RSs the network should configure two measld(s) for each quantity, one per RS type.
  • conditional handover (or in more general terms, conditional mobility, which includes also conditional resume or reestablishment being triggered based on a condition)
  • a condition is associated to a mobility procedure and, upon the fulfillment of the condition the UE triggers a mobility procedure.
  • reportConfig filed of type/IE ReportConfigNR serves as baseline for the trigger condition, e.g. A3 event configuration for intra-frequency handovers.
  • the network would configure the UE with a condition equivalent to existing reportConfig, where it is possible to configure RSRP, or RSRQ, or SINR as a single trigger quantity per event that is being monitored.
  • the network would either not configure conditional handover due to this limitations and performance risks or, the UE would risk in many cases taking wrong handover decisions. For example, if the network configures the condition based on RSRP for a condition like A3 event, UE would detect better RSRP in neighbour than in serving, but neighbour could have worse RSRQ, leading to handover failure or poor service performance.
  • the network may want to trigger handovers towards a target candidate cell only when both SSB based and CSI-RS based conditions are fulfilled. For example, if measurements configured for different RS types are used as a way to understand the quality/coverage of wide beams and narrow beams, the network may first receive measurement reports where the condition for one RS type is fulfilled and then wait until it receives measurement reports for the other RS type when a second condition is fulfilled, so that only when both measurement reports start to be received the network sends a handover command.
  • Some embodiments may provide solutions to these or other challenges.
  • Some embodiments for example comprise a method at a UE for conditional mobility procedure, e.g., conditional handover, conditional resume or conditional reestablishment procedure.
  • the method comprises receiving, e.g., via control signalling 26, a set of trigger conditions, e.g., conditions 28, for a conditional mobility, where each trigger condition is possibly associated to a different trigger quantity, such as RSRP, RSRQ, SI NR, etc., and where the set of conditions are linked to at least one conditional mobility
  • trigger quantity may be for measurements on a single RS type, e.g. SSB, CSI-RS, TRS, etc., or to multiple RS types, e.g., SSB and CSI-RS, SSB and TRS, or any other combination of measurements based on different RS types, etc.
  • the method may also comprise monitoring the set of trigger conditions, where each set is associated to a specific conditional mobility configuration, and where each condition is based on a set of measurements.
  • the method may further comprise triggering a conditional mobility procedure according to the conditional mobility configuration upon the fulfilment of the complete set of multiple trigger conditions.
  • conditional mobility is based on multiple trigger quantities, e.g. RSRP and RSRQ, RSRP and SINR, RSRP and RSRQ and SINR, RSRP and SINR, etc., possibly based on the same RS type, e.g. SSB, CRSs, CSI-RS, or different RS types, e.g. RSRP-SSB and RSRQ-CSI-RS.
  • Conditional handover is configured to improve the robustness of mobility procedure.
  • the decision to perform handovers by the network is typically based on coverage and quality conditions, typically comparing target candidates and source cells. In other words, multiple conditions must be fulfilled before the network takes a handover decision.
  • the trigger condition leading the UE to trigger a conditional mobility can possibly be based on multiple trigger quantities, e.g., RSRP and RSRQ, either based on a single RS type or multiple RS types.
  • RSRP trigger quantities
  • RSRQ Radio Service Set
  • the network may decide that the UE shall only execute the conditional handover when conditions for a given quantity, e.g. RSRP, or multiple ones, RSRP and RSRQ, are fulfilled for multiple RS types e.g. condition for RSRP based on SSB is fulfilled AND condition for RSRP based on CSI-RS is fulfilled, which translates that the coverage for wide beams (SSBs) and narrow beams (CSI-RS configuration) is better in a given neighbour than in the PCell and/or PSCell.
  • a given quantity e.g. RSRP, or multiple ones, RSRP and RSRQ
  • conditional mobility may refer to conditional handover, conditional resume, conditional reconfiguration with sync, conditional reconfiguration, conditional reestablishment, or any other procedure that is configured by network to the UE which contains condition(s) (e.g. associated to one or multiple measurement event) and, upon the fulfilment of the condition(s) the UE shall perform the mobility related procedure e.g. resume., handover, reconfiguration with sync, beam switching, etc.
  • condition(s) e.g. associated to one or multiple measurement event
  • the term“reference” may refer to a link, pointer, association or any means to index and identify a measurement configuration that is either stored at the UE or that is being provided to the UE together with the conditional mobility configuration.
  • the methods herein apply for a conditional mobility configuration associated to a single cell or to multiple cells.
  • a single measurement configuration reference is provided and linked to a mobility procedure.
  • a single measurement configuration reference may be provided and linked to the monitoring of multiple cells e.g. within the same measurement object / frequency.
  • multiple measurement configuration references may be provided and referred to different cells.
  • condition mobility configuration This may be interpreted as the RRCReconfiguration in NR terminology (or
  • RRCConnectionReconfiguration if LTE terminology prepared by a potential target cell that the UE applies and performs action upon when the configured condition for the conditional mobility procedure is triggered.
  • that multiple trigger quantities are introduced for the condition triggering conditional mobility means that the UE monitors the fulfilment of conditions associated to multiple conditions e.g. RSRP above a threshold AND RSRQ above a threshold such that only when both are fulfilled the UE applies the RRCReconfiguration and performs action upon. The same is valid for conditional mobility based on resume. When the condition based on multiple triggers, like RSRP and RSRQ, is fulfilled the UE triggers a resume procedure towards the target cell fulfilling the condition.
  • the UE is configured with a conditional HO in NR, possibly with multiple NR and/or LTE measurement quantities, then the condition is triggered and UE executes the HO in LTE.
  • NR conditions for example, these may be based on SSB and/or CSI-RS.
  • the UE is configured with a conditional HO in LTE, possibly with multiple NR and/or LTE measurement quantities, then the condition is triggered and UE executes the HO in NR.
  • NR conditions for example, these may be based on SSB and/or CSI-RS.
  • the UE is configured with a conditional HO in RAT-1 , possibly with multiple RAT-1 and/or RAT-2 measurement quantities, then the condition is triggered and UE executes the HO in RAT-2;
  • a mobility configuration may include a conditional configuration for Secondary Cell Group (SCG) addition or Secondary Cell (SCell) addition, or equivalent.
  • SCG Secondary Cell Group
  • SCell Secondary Cell
  • the trigger quantities that are described herein may be at least RSRP,
  • RSRQ and SINR can be based on cell measurements, i.e. cell level RSRP, cell level RSRQ, cell level SINR.
  • the method may comprise at least the following configurations: (i) RSRP and RSRQ; (ii) RSRP and SINR; (iii) RSRQ and SINR; and (iv) RSRP, RSRQ and SINR.
  • the method may comprise the monitoring of multiple conditions in parallel and, triggering the mobility procedure only when the configured conditions for multiple trigger quantities are fulfilled.
  • the trigger quantities herein may be based on one or both of SS/PBCH Block (SSB) and CSI-RS.
  • SSB SS/PBCH Block
  • the cell level measurements are performed based on these reference signals i.e. cell level SS-RSRP, cell level SS-RSRQ, cell level SS- SINR, cell level CSI-RSRP, cell level CSI-RSRQ, cell level CSI-SINR.
  • the methods may comprise at least the following configurations: (1) SS- RSRP and SS-RSRQ; (2) SS-RSRP and SS-SINR; (3) SS-RSRQ and SS-SINR; (4) SS-RSRP, SS-RSRQ and SS-SINR; (5) CSI-RSRP and CSI-RSRQ; (6) CSI-RSRP and CSI-SINR; (7) CSI-RSRQ and CSI-SINR; (8) CSI-RSRP, CSI-RSRQ and CSI- SINR; (9) SS-RSRP and CSI-RSRP; (10) SS-RSRP and CSI-RSRQ; (11) SS-RSRP and CSI-SINR; (12) SS-RSRQ and CSI-RSRP; (13) SS-RSRQ and CSI-RSRQ; (14) SS-RSRQ and CSI-SINR;
  • SS-RSRP, SS-RSRQ and CSI-RSRQ (19) SS-RSRP, SS-RSRQ and CSI-RSRQ; (20) SS-RSRP, SS-RSRQ and CSI- SINR; (21) SS-RSRP, SS-SINR and CSI-RSRP; (22) SS-RSRP, SS-SINR and CSI- RSRQ; (23) SS-RSRP, SS-SINR and CSI-SINR; (24) SS-SINR, SS-RSRQ and CSI- RSRP; (25) SS-SINR, SS-RSRQ and CSI-RSRQ; (26) SS-SINR, SS-RSRQ and CSI-SINR; (27) CSI-RSRP, CSI -RSRQ and SS-RSRP; (28) CSI -RSRP, CSI - RSRQ and SS-RSRQ; (29) CSI -RSRP, CSI
  • the set of conditions associated to the different quantities may be received in different manners.
  • Trigger quantity may be for measurements on a single RS type (e.g. SSB, CSI-RS, TRS, etc.) or to multiple RS types (e.g. SSB and CSI-RS, SSB and TRS, any other combination of measurements based on different RS types, etc.)
  • the UE receives an event configuration with multiple trigger quantities. That may be done, for example, using a SEQUENCE to encode the quantities instead of a CHOICE in the signaling from the network to the UE.
  • the condition for conditional mobility is Neighbour becomes offset better than SpCell, like in an A3 event
  • the event configuration may be as follows:
  • MeasT riggerQuantityOffsetForCHO SEQUENCE ⁇
  • a single hysteresis value is provided for possibly the multiple quantities, in triggering events where a hysteresis is configured for conditional mobility.
  • the UE may also receive multiple hysteresis values, each associated to a specific trigger quantity.
  • MeasT riggerQuantityOffsetForCHO SEQUENCE ⁇
  • HysteresisPerQuantity SEQUENCE ⁇
  • TimeToTrigger :: ENUMERATED ⁇
  • the UE may also receive multiple hysteresis and/or multiple time-to-trigger values, each associated to a specific trigger quantity.
  • triggerCHOX3 SEQUENCE ⁇
  • MeasT riggerQuantityOffsetForCHO SEQUENCE ⁇
  • HysteresisPerQuantity SEQUENCE ⁇ rsrp INTEGER (0..30) OPTIONAL,
  • TimeToTriggerPerQuantity SEQUENCE ⁇
  • the conditions may be configured as a CHOICE between different triggering events for conditional mobility and, each event (possibly encoded as a reportConfig) may contain the configuration of multiple trigger quantities as described in the method so that the triggering of the event triggers a conditional mobility procedure.
  • a reportConfig may contain the configuration of multiple trigger quantities as described in the method so that the triggering of the event triggers a conditional mobility procedure.
  • EventT riggerConfigForCHO SEQUENCE ⁇
  • HysteresisPerQuantity SEQUENCE ⁇
  • MeasTriggerQuantityOffsetForCHO SEQUENCE ⁇
  • MeasTriggerQuantityForCHO SEQUENCE ⁇
  • TimeToTriggerPerQuantity SEQUENCE ⁇
  • the UE receives a configuration where multiple trigger quantities per RS type may be provided.
  • the configuration may be as follows: triggerCHOX3 SEQUENCE ⁇
  • MeasT riggerQuantityOffsetForCHO SEQUENCE ⁇
  • the UE may be configured with the following rsrp-SSB condition AND rsrq-SSB AND rsrp-CSI-RS condition AND rsrq-CSI-RS condition.
  • Embodiment A even though multiple quantities may be provided per rsType, a single hysteresis value is provided for possibly the multiple quantities, in triggering events where a hysteresis is configured for conditional mobility.
  • the UE may also receive multiple hysteresis values, each associated to a specific trigger quantity per rsType. triggerCHOX3 SEQUENCE ⁇
  • HysteresisPerQuantity SEQUENCE ⁇
  • TimeToTrigger :: ENUMERATED ⁇
  • Embodiment A even though multiple quantities per rsType may be provided, a single time-to-trigger value is provided for possibly the multiple quantities, in triggering events where a time-to-trigger is configured for conditional mobility.
  • the UE may also receive multiple time-to-trigger values, each associated to a specific trigger quantity per rsType. triggerCHOX3 SEQUENCE ⁇
  • TimeToTriggerPerQuantity SEQUENCE ⁇
  • the UE may also receive multiple hysteresis and/or multiple time-to-trigger values, each associated to a specific trigger quantity per rsType.
  • triggerCHOX3 SEQUENCE ⁇ Offset MeasT riggerQuantityOffsetForCHO, hysteresis HysteresisPerQuantity,
  • MeasT riggerQuantityOffsetForCHO SEQUENCE ⁇
  • HysteresisPerQuantity SEQUENCE ⁇
  • TimeT oT riggerPerQuantity: : SEQUENCE ⁇
  • the conditions may be configured as a CHOICE between different triggering events for conditional mobility and, each event may contain the configuration of multiple trigger quantities per rsType as described in the method.
  • An example is shown below:
  • EventT riggerConfigForCHO SEQUENCE ⁇
  • eventX4 SEQUENCE ⁇ x4-Threshold MeasT riggerQuantity
  • HysteresisPerQuantity SEQUENCE ⁇
  • MeasT riggerQuantityOffsetForCHO SEQUENCE ⁇
  • MeasTriggerQuantityForCHO SEQUENCE ⁇
  • TimeT oT riggerPerQuantity: : SEQUENCE ⁇
  • condition configuration is of type/IE
  • EventTriggerConfigForCHO and is part of a specific conditional mobility
  • Example 1a Single RRCReconfiguration message with a conditional handover configuration
  • every RRCReconfiguration associated to a target cell candidate is associated to its own condition i.e. there may be X conditions for X messages, each for each target cell candidate, as shown below.
  • the RRCReconfiguration message is the command to modify an RRC connection. It may convey information for measurement configuration, mobility control, radio resource configuration (including RBs, MAC main configuration and physical channel configuration) including and security configuration.
  • Signalling radio bearer SRB1 or SRB3
  • condReconfiguration CondReconfiguration OPTIONAL masterCellGroup OCTET STRING (CONTAINING CellGroupConfig) OPTIONAL, - Need M
  • Example 2a RRCConditionalReconfiguration message with possibly multiple conditional handover configurations (where each contains its own condition, possibly with multiple trigger quantities)
  • every RRCRecon figuration associated to a target cell candidate is associated to its own condition i.e. there may be X conditions for X messages, each for each target cell candidate, as shown below. But, in the same message there may be multiple conditional handover configurations, each of them with its own condition and its own RRCRecon figuration message to be applied at the fulfillment of the condition.
  • the RRCConditionalReconfiguration message is the command to modify an RRC connection upon the triggering of an associated condition. It may convey information for measurement configuration, mobility control, radio resource configuration (including RBs, MAC main configuration and physical channel configuration) including and security configuration.
  • Signalling radio bearer SRB1 or SRB3
  • Embodiment B the UE receives in each event configuration a single trigger quantity. That may be done using a CHOICE.
  • the condition for conditional mobility is an A3 event (i.e. Neighbour becomes offset better than SpCell)
  • the configuration may be as follows: triggerCHOX3 SEQUENCE ⁇
  • MeasTriggerQuantityOffsetForCHO :: CHOICE ⁇
  • the conditions may be configured as a CHOICE between different triggering events for conditional mobility and, each event may contain the configuration of a single trigger quantity.
  • a CHOICE between different triggering events for conditional mobility and, each event may contain the configuration of a single trigger quantity.
  • EventT riggerConfigForCHO SEQUENCE ⁇
  • HysteresisPerQuantity:: INTEGER (0..30)
  • MeasTriggerQuantityOffsetForCHO :: CHOICE ⁇
  • MeasTriggerQuantityForCHO :: CHOICE ⁇
  • the UE is provided with at least one list of elements of type/IE EventTriggerConfigForCHO. Then, each element in the list may contain the same event configuration but different trigger quantities, so that the UE gets multiple trigger quantities and associated configurations for the same conditional mobility configuration.
  • RS types i.e. , the list may mix configurations for the same RS type or for different RS types, each condition is for a single trigger quantity and single RS type.
  • Example 1 b Single RRCRecon figuration message with a conditional handover configuration
  • the RRCRecon figuration message is the command to modify an RRC connection. It may convey information for measurement configuration, mobility control, radio resource configuration (including RBs, MAC main configuration and physical channel configuration) including and security configuration.
  • Signalling radio bearer SRB1 or SRB3
  • RRCReconfiguration-v16-IEs :: SEQUENCE ⁇ condReconfiguration CondReconfiguration OPTIONAL, masterCellGroup OCTET STRING (CONTAINING
  • triggerConditionList SEQUENCE (SIZE(1..MaxNumCond)) OF
  • RRCConditionalReconfiguration message with possibly multiple conditional handover configurations (where each contains its own list of conditions)
  • the RRCConditionalReconfiguration message is the command to modify an RRC connection upon the triggering of an associated condition. It may convey information for measurement configuration, mobility control, radio resource configuration (including RBs, MAC main configuration and physical channel configuration) including and security configuration.
  • Signalling radio bearer SRB1 or SRB3
  • rrcReconfigurationT oApply RRCReconfiguration, triggerConditionList SEQUENCE (SIZE(1..MaxNumCond)) OF
  • Embodiment B there may be some restrictions introduced in the standards, such as using the same event type and only vary the trigger quantity.
  • the UE is configured with multiple conditions associated to the same conditional mobility configuration.
  • each conditional handover configuration linked to an RRCReconfiguration is a list of conditions, where each condition has the same structure of a measurement as defined in connected mode i.e. a measld, that is linked to measurement object, and to a reportConfig (where an event and its parameters may be configured, such as trigger quantity, time to trigger, RS type, etc.).
  • the list of event configurations may be replaced by a list of measurement identifiers which may have already been stored at the UE e.g. via a measurement configuration (measConfig of IE MeasConfi IE/Typeg) previous provided to the UE. And/or, for which the UE is already performing measurements.
  • the UE may monitor one or more of the following conditions associated to the triggering of conditional mobility: Event X1 , X2, X3, X4, X5, and/or X6.
  • Event X1 (Serving becomes better than threshold)
  • the UE shall:
  • MeasTriggerQuantityForCHO MeasTriggerQuantityForCHO
  • Ms is the measurement result of the serving cell, not taking into account any offsets.
  • Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within EventTriggerConfigForCHO for this event).
  • Thresh is the threshold parameter for this event (i.e. x1-Threshold as defined within EventTriggerConfigForCHO for this event).
  • Ms is expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS- SINR.
  • Hys is expressed in dB. Thresh is expressed in the same unit as Ms.
  • Event X2 (Serving becomes worse than threshold)
  • the UE shall:
  • Ms is the measurement result of the serving cell, not taking into account any offsets.
  • Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within EventThggerConfigForCHO for this event).
  • Thresh is the threshold parameter for this event (i.e. x2-Threshold as defined within EventThggerConfigForCHO for this event).
  • Ms is expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS- SINR.
  • Hys is expressed in dB.
  • Thresh is expressed in the same unit as Ms. Event X3 (Neighbour becomes offset better than SpCell)
  • the UE shall:
  • the cell(s) that triggers the event has reference signals indicated in the measObjectNR associated to this event which may be different from the NR SpCellmeasObjectNR.
  • Mn is the measurement result of the neighbouring cell, not taking into account any offsets.
  • offsetMO as defined within measObjectNR corresponding to the neighbour cell
  • Ocn is the cell specific offset of the neighbour cell (i.e. celllndividualOffset as defined within measObjectNR corresponding to the frequency of the neighbour cell) and set to zero if not configured for the neighbour cell.
  • Mp is the measurement result of the SpCell, not taking into account any offsets.
  • Ofp is the measurement object specific offset of the SpCell (i.e. offsetMO as defined within measObjectNR corresponding to the SpCell).
  • Ocp is the cell specific offset of the SpCell (i.e. celllndividualOffset as defined within measObjectNR corresponding to the SpCell) and is set to zero if not configured for the SpCell.
  • Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within EventThggerConfigForCHO for this event).
  • Off is the offset parameter for this event (i.e. x3-Offset as defined within
  • EventThggerConfigForCHO for this event
  • Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.
  • Ocn, Ofp, Ocp, Hys, Off are expressed in dB.
  • the UE shall:
  • MeasTriggerOuantityForCHO MeasTriggerOuantityForCHO
  • Mn is the measurement result of the neighbouring cell, not taking into account any offsets.
  • offsetMO as defined within measObjectNR corresponding to the neighbour cell
  • Ocn is the measurement object specific offset of the neighbour cell (i.e.
  • celllndividualOffset as defined within measObjectNR corresponding to the neighbour cell) and set to zero if not configured for the neighbour cell.
  • Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within EventThggerConfigForCHO for this event).
  • Thresh is the threshold parameter for this event (i.e. x4-Threshold as defined within EventThggerConfigForCHO for this event).
  • Mn is expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS- SINR.
  • Thresh is expressed in the same unit as Mn.
  • Event X5 (SpCell becomes worse than thresholdl and neighbour/SCell becomes better than threshold2)
  • the UE shall:
  • condition X5-3 or condition X5-4 i.e. at least one of the two, as specified below, is fulfilled
  • Mp is the measurement result of the NR SpCell, not taking into account any offsets.
  • Mn is the measurement result of the neighbouring cell/SCell, not taking into account any offsets.
  • offsetMO as defined within measObjectNR corresponding to the neighbour cell/SCell
  • Ocn is the cell specific offset of the neighbour cell/SCell (i.e. celllndividualOffset as defined within measObjectNR corresponding to the neighbour cell/SCell), and set to zero if not configured for the neighbour cell.
  • Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within EventTriggerConfigForCHO for this event).
  • Threshl is the threshold parameter for this event (i.e. x5-Threshold1 as defined within EventTriggerConfigForCHO for this event).
  • Thresh2 is the threshold parameter for this event (i.e. x5-Threshold2 as defined within EventTriggerConfigForCHO for this event).
  • Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRG and RS-SINR.
  • Threshl is expressed in the same unit as Mp.
  • Thresh2 is expressed in the same unit as Mn.
  • Event X6 Neighbour becomes offset better than SCell
  • the UE shall:
  • Mn is the measurement result of the neighbouring cell, not taking into account any offsets.
  • Ocn is the cell specific offset of the neighbour cell (i.e. celllndividualOffset as defined within the associated measObjectNR) and set to zero if not configured for the neighbour cell.
  • Ms is the measurement result of the serving cell, not taking into account any offsets.
  • Ocs is the cell specific offset of the serving cell (i.e. celllndividualOffset as defined within the associated measObjectNR) and is set to zero if not configured for the serving cell.
  • Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within EventThggerConfigForCHO for this event).
  • Off is the offset parameter for this event (i.e. x6-Offset as defined within
  • EventThggerConfigForCHO for this event
  • Mn Ms are expressed in dBm in case of RSRP, or in dB in case of RSRQ and RS-SINR.
  • Ocn, Ocs, Hys, Off are expressed in dB.
  • the event triggering conditions shown above are still valid, but the UE shall use trigger quantity specific thresholds/offsets in the above equations.
  • the event triggering conditions shown above are still valid but the UE shall use trigger quantity specific thresholds/offsets and also the UE shall use trigger quantity specific hysteresis in the above equations.
  • the UE in some embodiments shall perform one of the following actions;
  • the UE shall trigger the handover execution procedure which involves the random access procedure towards the cell which satisfies the event entering condition.
  • the UE shall trigger the resume procedure towards the cell which satisfies the event entering condition.
  • the UE in other embodiments shall perform one of the following actions;
  • the UE shall trigger a measurement report to the source cell about the event leaving condition being fulfilled. Using this message, the source cell can decide whether to instruct the UE to discard the condition reconfiguration message or not.
  • the UE shall continue to monitor the measurement
  • condition for conditional handover is configured with a reference to one existing measurement identifier and/or measurement object and/or report configuration associated to multiple trigger quantities i.e. network knows that the UE has the referred configuration stored. In that assumption, the specification needs to define events (i.e. a measld linked to a reportConfig linked to a measObject) that may contain multiple trigger quantities possibly based on different RS types.
  • events i.e. a measld linked to a reportConfig linked to a measObject
  • condition for conditional handover is configured with one or multiple references to one or multiple existing measurement identifiers and/or measurement objects and/or report configurations associated to multiple trigger quantities i.e. network knows that the UE has the referred configuration stored.
  • network knows that the UE has the referred configuration stored.
  • conditional handover configuration is triggered and applied if both the RSRP measurement associated with meas-ld1 and the RSRQ measurement associated with meas-ld2 both meet their respective triggering condition.

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Abstract

L'invention concerne un dispositif sans fil (16) configuré pour recevoir une signalisation de commande (26) indiquant de multiples conditions (28) devant être combinées en une expression logique (30) que le dispositif sans fil (16) doit évaluer pour décider s'il faut appliquer une configuration de mobilité conditionnelle (22). Au moins deux des conditions peuvent être basées sur des mesures de signal qui sont de différents types et/ou qui sont effectuées sur différents types de signaux. Dans certains modes de réalisation, le dispositif sans fil (16) est également configuré pour décider, sur la base de l'évaluation de l'expression logique (30), s'il faut appliquer la configuration de mobilité conditionnelle (22). Le dispositif sans fil (16) peut en outre être configuré pour appliquer ou non la configuration de mobilité conditionnelle (22) en fonction de ladite décision.
PCT/SE2019/051255 2018-12-14 2019-12-10 Mobilité conditionnelle dans un système de communication sans fil WO2020122796A1 (fr)

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WO2021145810A1 (fr) * 2020-01-17 2021-07-22 Telefonaktiebolaget Lm Ericsson (Publ) Reconfiguration conditionnelle
US20230180075A1 (en) * 2021-01-15 2023-06-08 Apple Inc. Handover with pscell based on trigger message
WO2023011883A1 (fr) * 2021-08-02 2023-02-09 Nokia Technologies Oy Repli vers un transfert interccelulaire conditionnel à l'aide d'un signal de référence ssb
WO2024164193A1 (fr) * 2023-02-08 2024-08-15 Apple Inc. Amélioration de cho basée sur des cellules source et cible en mode nes

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