WO2022043097A1 - Commande de transfert dans une opération musim - Google Patents

Commande de transfert dans une opération musim Download PDF

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Publication number
WO2022043097A1
WO2022043097A1 PCT/EP2021/072603 EP2021072603W WO2022043097A1 WO 2022043097 A1 WO2022043097 A1 WO 2022043097A1 EP 2021072603 W EP2021072603 W EP 2021072603W WO 2022043097 A1 WO2022043097 A1 WO 2022043097A1
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WO
WIPO (PCT)
Prior art keywords
daps
network device
usim
parameter
source network
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Application number
PCT/EP2021/072603
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English (en)
Inventor
Srinivasan Selvaganapathy
Faranaz SABOURI-SICHANI
Amaanat ALI
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Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Publication of WO2022043097A1 publication Critical patent/WO2022043097A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H04W36/185—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection using make before break

Definitions

  • This application is directed, in general, to a 5G handover for mobile devices and, more specifically, to a 5G handover minimizing communication packet delays.
  • a user equipment can be requested to perform a handover operation transferring the communication connection from a source network device to a target network device, such as a 5G base station (gNB) or an E-UTRA enhanced 4G eNodeB base station (eNB).
  • a target network device such as a 5G base station (gNB) or an E-UTRA enhanced 4G eNodeB base station (eNB).
  • the UE could be moving and the target network device would be better suited to handle the communications going forward, there could be load balancing between the source network device and the target network device, or the UE could be located close to a midpoint between the source network device and the target network device. Transferring from the source network device to the target network device may utilize a 5G handover protocol.
  • a dual active protocol stack protocol can be utilized to minimize a delay of communications as the handover operation is in progress between the two network devices.
  • the UE may not have a second protocol stack (PS) to use with the DAPS handover operation.
  • PS protocol stack
  • a second PS may be in use by a second communication connection.
  • a method includes (1) receiving a first handover (HO) message at a user equipment (UE) indicating a HO operation, wherein the UE is capable of utilizing at least two protocol stacks (PS) and operating with at least a first universal subscriber identity module (SIM)(USIM) and a second USIM, at least the first USIM is capable of a dual active protocol stack (DAPS), the first HO message is received from a source network device, and the first HO message includes a parameter indicating DAPS protocols are to be used, (2) communicating a second HO message from the UE that includes one or more parameters indicating an availability of DAPS resources at the UE, (3) receiving a third HO message at the UE, wherein the third HO message includes a reconfiguration message utilizing the second HO message to update the HO operation, where the reconfiguration message includes at least one of a delayed-DAPS-execution-timer parameter, a dedicated-PS -allocation parameter,
  • a system in one embodiment, includes (1) a UE, operable to transceive communications with one or more network devices, wherein the UE supports at least two PS and at least two USIMs, where at least one USIM is capable of utilizing DAPS, (2) a source network device, operable to transceive communications with the UE, and (3) a target network device, operable to transceive communications with the UE and the source network device, wherein the source network device determines a HO operation utilizing DAPS, and a measurement report is received from the UE by the source network device where the measurement report includes one or more of a DAPS-resources-available parameter, a T-UE- DELAY parameter, or a restricted-DAPS-operation parameter.
  • a method for performing a DAPS HO operation when a UE does not have two dedicated PSs available for the DAPS HO operation includes (1) sending a measurement configuration from a source network device to the UE using a first USIM, wherein the measurement configuration includes a DAPS-resource- indicator parameter, (2) transmitting a measurement report from the UE to the source network device, wherein the measurement report includes a DAPS-resources-available parameter, (3) sending a reconfiguration message from the source network device to the UE, wherein the reconfiguration message includes one of a T-NW-DELAY parameter, a dedicated-PS -allocation parameter, or a non-DAPS-operation parameter, and (4) performing the DAPS HO operation between the UE, the source network device, and a target network device utilizing the reconfiguration message.
  • the apparatus includes (1) a UE, operable to transceive communications with one or more network devices, wherein the UE is capable of utilizing at least two PS and operating with at least a first USIM and a second USIM, at least the first USIM is capable of a DAPS, (2) a source network device that is included in the one or more network devices, operable to initiate a DAPS HO operation, and (3) a target network device that is included in the one or more network devices, operable to transceive communications with the source network device and the UE, wherein the DAPS HO operation is from the source network device to the target network device, where the UE indicates a flexible DAPS HO operation, the UE receives one or more reconfiguration parameters, and the UE performs the DAPS HO operation with the source network device and the target network device utilizing the reconfiguration parameters, and where the reconfiguration parameters are one or more of a delayed-DAPS-execution-timer parameter, a dedicated
  • the apparatus includes (1) a source network device, operable to initiate a DAPS HO operation, (2) a target network device, operable to transceive communications with the source network device, to provide DAPS parameters in response to a flexible DAPS protocol request, and wherein the DAPS HO operation is from the source network device to the target network device, and (3) a UE, operable to transceive communications with the source network device and the target network device, wherein the source network device receives parameters from the UE indicating a flexibility in DAPS protocols, the source network device communicates one or more DAPS protocol parameters, and the UE, the source network device, and the target network device perform the DAPS HO utilizing the DAPS protocol parameters, where the DAPS protocol parameters are one or more of delayed-DAPS-execution-timer parameter, a dedicated-PS-allocation parameter, or a non-DAPS-operation parameter, and where the UE is capable of utilizing at least two PS and operating with at least
  • FIG. 1 A is an illustration of a diagram of an example communication scenario with a user equipment (UE) having two universal subscriber identity modules (USIMs) on the same mobile network operator (MNO);
  • UE user equipment
  • USIMs universal subscriber identity modules
  • FIG. IB is an illustration of a diagram of an example communication scenario with a UE having two USIMs on different MNOs;
  • FIG. 2 is an illustration of a diagram of an example signal flow for a dual active protocol stack (DAPS) handover (HO) operation;
  • DAPS dual active protocol stack
  • HO handover
  • FIG. 3 is an illustration of a diagram of an example signal flow utilizing a delayed execution timer for a HO operation
  • FIG. 4 is an illustration of a diagram of an example signal flow utilizing a shared protocol stack PS for a HO operation
  • FIG. 5 is an illustration of a diagram of an example signal flow system utilizing DAPS.
  • FIG. 6 is an illustration of a diagram of an example method to implement a DAPS HO operation.
  • USBs universal subscriber identity modules
  • SIM dual subscriber identity module
  • DAPS dual active protocol stacks
  • HO handover
  • UE User equipment
  • UE User equipment
  • UE can establish a communication link with one or more network devices
  • a 5G base station gNB
  • UMTS evolved universal mobile telecommunications system
  • E-UTRA enhanced 4G eNodeB E- UTRA base station
  • network devices can be referred herein as gNB and shall include eNB.
  • the communications between the UE and the network device can be transferred, e.g., HO, to another network device for various reasons, for example, as the UE is moving the second network device may be able to provide a higher quality communication link or when communication load balancing is being performed between the network devices.
  • a MUSIM device can have two (dual) or more (multiple) simultaneous 3GPP/3GPP2 network subscriptions with multiple corresponding international mobile subscriber identities (IMSI) in case of evolved packet system (EPS), or subscription permanent identifier (SUPI) associated with a particular subscription belonging to a same or different mobile network operator (MNO).
  • IMSI international mobile subscriber identities
  • EPS evolved packet system
  • SUPI subscription permanent identifier
  • MNO mobile network operator
  • MNO includes mobile virtual network operators (MVNO).
  • FIG. 1A demonstrates two subscriptions belonging to the same MNO, registered with two independent USIMs at the core network.
  • the UE may be using the same network device or two neighboring network devices as the serving network device, such as when the UE is at the edge between two or more network devices, when load balancing is in progress, or when a HO operation is in progress.
  • One USIM can be served by or registered to a first network device while a second USIM can be served by a second network device.
  • the two USIMs belong to different MNOs and can use two neighboring or co-located network devices from each respective MNO as the serving network device.
  • MUSIM UE Two types can be referred to depending on the supported simultaneous radio resource control (RRC) state on the USIMs.
  • RRC radio resource control
  • DSDS Dual USIM dual standby
  • MUMS Multi USIM Multi Standby
  • RRC radio resource control
  • DSDS Dual USIM dual standby
  • MUMS Multi USIM Multi Standby
  • RRC idle e.g., RRC IDLE
  • the UEs can have a RRC connected, e.g., RRC CONNECTED, mode with one USIM at a time.
  • Dual USIM Dual Active (DSD A) or Multi USIM Multi Active (MUMA) - can be MUSIM UEs that are registered with two or more USIMs and can be in a RRC idle mode on each USIM. The UE can maintain a RRC connected mode on each USIM within the same time interval.
  • Each of the source and target network devices have full L2 protocol stacks with their own security key for ciphering and deciphering of the packet data convergence protocol (PDCP) service data units (SDUs).
  • PDCP packet data convergence protocol
  • SDUs packet data convergence protocol service data units
  • the UE should establish a new radio link with the target network device, such as shown in steps 8 - 10 in FIG. 2, before detaching the radio link of the source network device, which is shown as step 18 in FIG. 2.
  • the UE would be exchanging data with the source and target network device, such as shown in steps 11-12 in FIG. 2.
  • the UE switches the UL user plane (transmission of new PDCP SDU) to the target network device when random access to the target network device is completed.
  • Other UL signalling e.g., channels status information (CSI) feedback, PDCP status report, and hybrid automatic repeat request (HARQ) feedback, continue between the UE and the source network device until it is released.
  • CSI channels status information
  • PDCP status report e.g., PDCP status report
  • HARQ hybrid automatic repeat request
  • 3 GPP Release 16 specifies that the target network device of a HO operation may decline the request for DAPS HO and fallback to a baseline HO. In this situation, the target network device provides target network device configuration for baseline HO rather than for a DAPS HO.
  • a DSDA MUSIM should allow the UE to be in RRC connected state for the USIMs at the same time. This would require two PS instances as well as two independent RX/TX hardware chains, one for each of the USIM operations. Therefore, DAPS mobility and DSDA operation of MUSIM cannot run simultaneously when extended requirements to the UE’s PS instances as well as hardware resources, for example the RX/TX chains, are not available,. If the UE supports two PS, then a first PS would be assigned as a resource to a first USIM and a second PS would be assigned as a resource to a second USIM. The first USIM or the second USIM would not be able to utilize two PS since one PS is available as a resource.
  • the communications on the second USIM is not critical, the communications can be suspended temporarily and the second PS can be assigned to the first USIM, allowing the first USIM to utilize DAPS for a HO operation. If the communications on the second USIM is critical, then an impact to the HO operation or to the second USIM communications would be experienced.
  • the UE can apply a UEassistanceinformation message and reduce some of its capabilities.
  • the capability reduction could include, for example, a reduction in the number of aggregated carriers, a reduction in the number of multiple input multiple output (MIMO) layers, or a reduction in the maximum TX power.
  • MIMO multiple input multiple output
  • This disclosure does not propose such a capability reduction.
  • This disclosure presents a preference related to activating a full feature due to resource sharing between more than one USIM.
  • This disclosure includes the network control messages related to the resource sharing and is applicable, for example, for UEs which have a limited number of PS compared to the number of USIMs supported by the UE such that a USIM may not have two PS resources available, for example, during a DAPS HO operation.
  • a method and system are presented for the UE to dynamically maintain its DSD A functionality with two or more USIMs in RRC connected state with minimum impact on each USIM’s operation.
  • the DAPS operation can be controlled such that a network device can dynamically fine-tune the DAPS operation. When the network device cannot provide the fine-tuning, the DAPS implementation would be determined by the UE, hidden from the network devices leading to potential performance or load impact on the network devices.
  • the process can have the UE provide information to the network device on a preference for non-DAPS HO operation, e.g., when two PS are not available to a first USIM capable of DAPS.
  • a DSDA MUSIM UE with DAPS capability on at least one of the USIMs is in RRC connected state with the first and second USIMs
  • the UE can include additional information in the measurement report in regard to a requested HO on its DAPS capable first USIM.
  • the additional information can indicate that DAPS resources are not available (for example, using a DAPS-resources-available parameter), depending on the communications on the second USIM.
  • the UE can provide a timer request for delayed execution of the DAPS HO operation, for example, using a T-UE-DELAY parameter.
  • the UE can provide an indication that a PS can be a shared resource, for example, using a restricted-DAPS-operation parameter.
  • the network device can control the DAPS execution with additional parameters.
  • the DAPS HO can be delayed until the UE indicates it can handle the DAPS HO utilizing conventional protocols.
  • a confirmed delayed DAPS timer parameter for example, a T-NW-DELAY parameter, can be communicated by the network device indicating that the execution of the DAPS HO can be delayed for the amount of the T-NW-DELAY parameter allowing the second USIM to complete its critical communications.
  • the T-NW- DELAY parameter can be defaulted to a value or it can be determined utilizing an algorithm utilizing, for example, the amount of network communications, the capabilities of the UE, such as speed, and other algorithm factors.
  • the second USIM operation can be suspended, allowing the PS assigned to the second USIM to be assigned to the first USIM, thereby the first USIM would have two PS assigned to carry out the DAPS HO operation.
  • the UE can operate with a modified dual stack operation using the second PS of the second USIM.
  • the UE can communicate this capability using a restricted- DAPS-operation parameter.
  • a modified dual stack operation means the first USIM, which is DAPS enabled, can utilize the first PS and time share the second PS using a time share protocol, for example, TDM, with the second USIM.
  • the source network device in consultation with the target network device, can specify a preference for the type of PS handling the UE should utilize, for example, the first PS can be used with one of the source network device or the target network device, and the second PS, e.g., the shared PS, can be used with the other of the source network device or target network device, for example, using a dedicated-PS-allocation parameter.
  • the UE can assign the first PS or the second PS to a separate dedicated RX/TX.
  • the DAPS HO operation can be transformed into a non-DAPS HO operation, for example, using a non-DAPS -operation parameter. In this aspect, the HO is performed using non-DAPS protocols.
  • the UE can have one or more DAPS capable USIMs and two or more USIMs and PSs.
  • DAPS capable When more than one USIM is DAPS capable, then the USIM involved with the DAPS HO operation is considered to be the first USIM using the first PS, and other USIMs are considered to be the second USIM using the second PS. If there is one USIM that is DAPS capable, then that USIM is considered to be the first USIM using the first PS.
  • this disclosure can be applied to the 3GPP TS 38.331 standard, and more specifically, to sections 5.5.2 “Measurement Configuration”, 6.2.2 “Message Definitions”, and 11.2.2 “Message Definitions” to include the DAPS resource availability messages. In some aspects, this disclosure is applicable to the E-UTRA standards.
  • Table 1 An example, for demonstration purposes, of the messaging changes to the standard are shown in Table 1. Other messaging changes and different messaging changes can be utilized to implement this disclosure; Table 1 is for example. The field name in Table 1 is using expanded field names for clarity, where the standard may utilize other abbreviations.
  • Table 1 Example message, container, and fields to support flexible DAPS operations on a UE with limited PS resources and at least two USIMs
  • FIG. 1A is an illustration of a diagram of an example communication scenario 100 with a UE having two USIMs on the same MNO.
  • Communication scenario 100 is a demonstration of one type of environment for this disclosure.
  • the environment for communication scenario 100 includes a geographic region 105 where three network devices are located, a source network device 110, a second network device 112, and a third network device 114.
  • a UE 116 is located within geographic region 105.
  • source network device 110, second network device 112, or third network device 114 can be a gNB or eNB.
  • UE 116 is capable of supporting two USIMs on the same MNO, a first USIM 120, and a second USIM 122.
  • First USIM 120 is DAPS capable.
  • second USIM 122 can be DAPS capable.
  • UE 116 can support additional USIMs.
  • UE 116 is capable of supporting at least one PS for each USIM supported. In this example, UE 116 has two USIMs and two PS, one PS assigned as a resource to first USIM 120 and one PS assigned as a resource to second USIM 122.
  • FIG. IB is an illustration of a diagram of an example communication scenario 150 with a UE having two USIMs on different MNOs.
  • Communication scenario 150 is similar to communication scenario 100 and demonstrates a second type of environment for this disclosure.
  • the environment for communication scenario 150 includes a geographic region 155 and a geographic region 156.
  • Network devices from two different MNOs are located in geographic region 155 and geographic region 156; a network device 160 and a network device 162B belonging to a first MNO, and a network device 164 and a network device 162A belonging to a second MNO.
  • a UE 166 is located within geographic region 155, and right at the border with geographic region 156.
  • network device 160, network device 162B, network device 164, or network device 162A can be a gNB or eNB.
  • UE 166 can have connections to two non-co-located network devices, such as network device 160 and network devicel64, or network device 160 and network device 162A. In other aspects, UE 166 can be connected to two co-located network devices, such as network device 162A and network device 162B.
  • UE 166 is capable of supporting two USIMs on two different MNOs, a first USIM 170 connected to the first MNO, and a second USIM 172 connected to the second MNO.
  • First USIM 170 is DAPS capable.
  • second USIM 172 can be DAPS capable.
  • UE 166 can support additional USIMs.
  • UE 166 is capable of supporting at least one PS for each USIM supported. In this example, UE 166 has two USIMs and two PS, one PS assigned as a resource to first USIM 170 and one PS assigned as a resource to second USIM 172.
  • First USIM 170 has a communications connection to source network device 160 using a network connection 180.
  • Second USIM 172 has a communications connection to source network device 164 using a network connection 184.
  • one of first USIM 170 or second USIM 172 can be connected to second network device 162A using network connection 182.
  • FIG. 2 is an illustration of a diagram of an example signal flow 200 for a DAPS HO operation.
  • Signal flow 200 demonstrates the standard using two PS to complete the HO operation.
  • Signal flow 200 has an operator UE 214, a source network device 210, a target network device 212, and user plane function (UPF) 216.
  • Steps 230 show communications between UE 214 and source network device 210, such as measurement configurations, measurement reports, and HO command as well as communications between source network device 210 and target network device 212 for HO preparation including HO request and request acknowledgement.
  • Steps 240 show UE 214 data being forwarded to target network device 212 to establish synchronicity of communications.
  • Steps 250 perform the HO execution, by establishing a RRC connection to the target network device.
  • Steps 260 show that UE 214 begins to communicate directly to target network device 212.
  • Steps 270 show that target network device 212 acknowledges the HO operation as completed, and target network device 212 becomes a source network device for UE 214.
  • This disclosure modifies the process occurring in steps 250 when UE 214 does not have two dedicated PS available for the DAPS HO operation.
  • FIG. 3 is an illustration of a diagram of an example signal flow 300 utilizing a delayed execution timer for a HO operation.
  • Signal flow 300 has a UE 314 with two USIMs, a first USIM 318 and a second USIM 319.
  • Signal flow 300 also has a first source network device 310 with a network connection to first USIM 318, a second source network device 312 with a network connection to second USIM 319, and a target network device 316.
  • First USIM 318 is DAPS capable and second USIM 319 can be DAPS capable.
  • first source network device 310 can communicate that DAPS usage by UE 314 can be flexible using a DAPS- resource-indicator parameter.
  • UE 314 can communicate that sufficient DAPS resources are not available, such as using a DAPS-resources- available parameter.
  • measurement report 340 can include an estimated delayed DAPS timer parameter, such as a T-UE -DELAY parameter, indicating a delay in the DAPS HO operation. This delay should be sufficient for the UE 314 to complete critical communications on second USIM 319 and therefore be able to allocate a second PS from second USIM 319 to first USIM 318.
  • First source network device 310 can determine a T-NW-DELAY parameter to communicate back to UE 314 in processing steps 345.
  • the T-NW-DELAY parameter can be communicated to UE 314.
  • the delay as specified in reconfiguration message 350 can be different than the delay estimated by UE 314.
  • UE 314 can wait for the earliest of the expiration of the T-NW- DELAY parameter or when a second PS resource becomes available. For example, if critical communications on second USIM 319 have ended, the PS assigned to second USIM 319 can be assigned as a resource to first USIM 318 and execution of the DAPS HO can proceed.
  • Signal flow 300 can be viewed, for example, using the steps as shown in List 1.
  • the DSDA MUSIM UE is in RRC connected state with a first source network device corresponding to its DAPS capable USIM, i.e., the first USIM.
  • the DSDA MUSIM UE is in RRC connected state with a second source network device corresponding to its other USIM, i.e., the second USIM.
  • the UE is configured for radio resource management (RRM) measurements by the first source network device with an indication that DAPS HO can be flexible.
  • RRM radio resource management
  • the UE is configured for RRM measurements by second source network device and the UE has critical communications with second source network device.
  • the UE can transmit its measurement report including a DAPS-resources-available parameter.
  • a T-UE-DELAY parameter can be provided.
  • First source network device can determine to initiate the DAPS HO operation and prepare the HO operation by a HO request to the target network device which in turn makes admission control and acknowledges the HO operation together with the corresponding configuration.
  • First source network device transmits in the reconfiguration message the DAPS HO command with a T-NW-DELAY parameter.
  • the UE continues to use its second PS resource with the second USIM and initiates the DAPS HO operation when the second USIM critical communication is completed or at the expiration of the T-NW-DELAY parameter, whichever occurs earlier.
  • FIG. 4 is an illustration of a diagram of an example signal flow 400 utilizing a shared PS for a HO operation.
  • Signal flow 400 is similar to signal flow 300 and is shown using the same actors.
  • Signal flow 400 has UE 314 with first USIM 318 and second USIM 319.
  • Signal flow 400 also has first source network device 310 with a network connection to first USIM 318, second source network device 312 with a network connection to second USIM 319, and target network device 316.
  • First USIM 318 is DAPS capable and second USIM 319 can be DAPS capable.
  • first source network device 310 can communicate that DAPS usage by UE 314 can be flexible, e.g., using a DAPS- resource-indicator parameter.
  • UE 314 can communicate that sufficient DAPS resources are not available, such as using a DAPS-resources- available parameter.
  • measurement report 440 can include a parameter indicating that DAPS has restricted availability on one or two PSs, such as using a restricted- D APS -operation parameter.
  • UE 314 is capable of sharing the one or two PSs using various methodologies, such as TDM, and at various duty cycles or percentages.
  • First source network device 310 can determine whether a shared PS is acceptable in processing steps 445. In some aspects, the determination can include to which network device the shared PS is assigned as a resource in processing steps 447.
  • the one or two PS parameters can be communicated to UE 314, for example, using a dedicated-PS -allocation parameter.
  • UE 314 can assign the shared PS, as indicated by reconfiguration message 450, as a resource for first USIM 318 for network communications with first source network device 310 or with target network device 316.
  • UE 314 can utilize various algorithms with the shared PS, such as TDM.
  • the dedicated-PS -allocation parameter can include a duty cycle, e.g., percentage, which should be assigned to the DAPS HO operation, for example, 60% of the time slices of the second PS should be utilized for the HO.
  • the PS that has lower availability can be assigned as the shared PS for purposes of reconfiguration message 450.
  • Signal flow 400 can be viewed, for example, using List 2.
  • the DSDA MUSIM UE is in a RRC connected state with the second source network device corresponding to its other USIM, e.g., the second USIM.
  • the UE is configured for RRM measurements by the first source network device with an indication that DAPS HO operations can be flexible.
  • the UE is configured for RRM measurements by the second source network device and the UE communications with the second source network device is not critical.
  • the UE transmits its measurement report including a restricted-D APS -operation parameter for at least one PS, (such as the PS corresponding to the first source network device, the PS corresponding to the target network device, or a combination thereof), and therefore needs to be time-shared by the UE with another RRC connection, such as the second USIM.
  • a restricted-D APS -operation parameter for at least one PS such as the PS corresponding to the first source network device, the PS corresponding to the target network device, or a combination thereof
  • the first source network device can determine to initiate the DAPS HO operation and prepares the HO operation by HO request to the target network device which in turn makes admission control and acknowledges the HO operation together with the corresponding configuration.
  • the first source network device evaluates which PS instance is least critical to the data connection and can utilize resources in a shared mode, such as TDM.
  • the first source network device transmits in a reconfiguration message the DAPS HO command with an indication about which PS instance is allowed to run in the shared mode, e.g., one or more of the source network device utilizing the shared PS or the target network device utilizing the shared PS, such as using a dedicated-PS-allocation parameter.
  • the UE starts execution of the DAPS HO operation and allocates the PS resources as indicated by the reconfiguration message.
  • the shared PS can continue to be utilized using a sharing algorithm, such as TDM, by the second USIM of the UE.
  • FIG. 5 is an illustration of a diagram of an example signal flow system 500 utilizing DAPS.
  • Signal flow system 500 is showing a message view passing between the network nodes.
  • Signal flow system 500 has a source network device 510 with a UPF 516a connected to other portions on the MNO, a target network device 512 with a UPF 516b, and a UE 514.
  • Source network device 510 can communicate a message configuration 520 to UE 514 indicating whether a DAPS operation can be flexible as to the parameters.
  • UE 514 can send a measurement report 530 indicating that a DAPS operation can be conducted or that DAPS is not available.
  • measurement report 530 can include either a T-UE-DELAY parameter or a restricted-DAPS-operation parameter.
  • Source network device 510 can determine the DAPS HO operation parameters through DAPS HO preparation messages 535.
  • Source network device 510 can communicate a reconfiguration message 540 to UE 514 indicating whether the DAPS operation can be delayed a specified amount of time (using a T-NW-DELAY parameter), whether a shared PS resource can be utilized and with which network device (using a dedicated-PS-allocation parameter), or whether the HO operation can utilize non-DAPS protocols (using a non-D APS -operation parameter).
  • target network device 512 can communicate with UE 514 using network connection 550.
  • FIG. 6 is an illustration of a diagram of an example method 600 to implement a DAPS HO operation.
  • Method 600 can be implemented on a set of network devices and nodes, such as a source network device, a target network device, and a UE.
  • Method 600 starts at a step 605 and proceeds to a step 610.
  • the UE receives a first HO operation message, e.g., a measurement configuration.
  • the first HO operation message includes whether a DAPS HO operation will be utilized and whether the DAPS HO operation can be flexible as to the parameters.
  • the UE communicates a second HO message, e.g., a measurement report.
  • the second HO message can communicate whether DAPS is currently available on the UE. If not, the second HO message can include either a T-UE-DELAY parameter or a restricted-DAPS- operation parameter.
  • the source network device optionally using parameters received from the target network device, can determine a change to the DAPS HO operation, utilizing various factors, for example, network traffic, priority of network traffic, movement of the UE, and other factors.
  • the UE receives a third HO message, e.g., a reconfiguration.
  • the third HO message can include, for example, a T-NW-DELAY parameter to be used by the UE, a dedicated-PS-allocation parameter indicating a preference for which network device should be assigned the shared PS resource, a non-D APS -operation parameter that indicates whether a change from DAPS protocols to non-D APS protocols for the operation will be utilized, and other parameters.
  • the UE performs the HO operation in conjunction with the source network device and the target network device. The UE utilizes the parameters as specified in the third HO message.
  • Method 600 ends at a step 650.
  • a portion of the above-described apparatus, systems or methods may be embodied in or performed by various analog or digital data processors, wherein the processors are programmed or store executable programs of sequences of software instructions to perform one or more of the steps of the methods.
  • a processor may be, for example, a programmable logic device such as a programmable array logic (PAL), a generic array logic (GAL), a field programmable gate arrays (FPGA), or another type of computer processing device (CPD).
  • PAL programmable array logic
  • GAL generic array logic
  • FPGA field programmable gate arrays
  • CPD computer processing device
  • the software instructions of such programs may represent algorithms and be encoded in machine-executable form on non- transitory digital data storage media, e.g., magnetic or optical disks, random-access memory (RAM), magnetic hard disks, flash memories, and/or read-only memory (ROM), to enable various types of digital data processors or computers to perform one, multiple, or all of the steps of one or more of the above-described methods, or functions, systems or apparatuses described herein.
  • non- transitory digital data storage media e.g., magnetic or optical disks, random-access memory (RAM), magnetic hard disks, flash memories, and/or read-only memory (ROM), to enable various types of digital data processors or computers to perform one, multiple, or all of the steps of one or more of the above-described methods, or functions, systems or apparatuses described herein.
  • Portions of disclosed examples or embodiments may relate to computer storage products with a non-transitory computer-readable medium that have program code thereon for performing various computer-implemented operations that embody a part of an apparatus, device or carry out the steps of a method set forth herein.
  • Non-transitory used herein refers to all computer-readable media except for transitory, propagating signals. Examples of non-transitory computer-readable media include, but are not limited to: magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROM disks; magneto-optical media such as floppy disks; and hardware devices that are specially configured to store and execute program code, such as ROM and RAM devices.
  • Examples of program code include machine code, such as produced by a compiler, and files containing higher level code that may be executed by the computer using an interpreter.
  • Each of the aspect in the SUMMARY can have one or more of the following additional elements in combination.
  • Element 1 wherein the source network device is one of a source gNB or a source eNB.
  • Element 2 wherein the UE operates the first USIM and the second USIM in DSDA mode.
  • Element 3 wherein the third HO message includes the delayed-D APS -executiontimer parameter that includes a T-NW-DELAY parameter.
  • Element 4 wherein the UE delays the HO operation until the earliest of an expiration of the T-NW-DELAY parameter or DAPS resources are available.
  • Element 5 wherein the second HO message includes one or more parameters specifying an estimated delay of the HO operation or a restricted DAPS operation.
  • Element 6 wherein the second HO message includes a restricted-D APS -operation parameter.
  • Element 7 wherein a non-shared PS in the at least two PS is utilized by the first USIM and a shared PS in the at least two PS is shared by the first USIM and the second USIM.
  • Element 8 wherein the third HO message includes the dedicated-PS-allocation parameter and specifies one of a non-shared PS in the at least two PS is utilized by the source network device and a shared PS in the at least two PS is utilized by the target network device, or the shared PS is utilized by the target network device and the non-shared PS is utilized by the source network device.
  • Element 9 wherein the third HO message includes the non-D APS -operation parameter.
  • Element 10 wherein the HO operation utilizes non-D APS protocols.
  • Element 11 wherein the network devices are two or more of a gNB or eNB.
  • Element 12 wherein the source network device determines a modification to the HO operation utilizing the measurement report and received parameters from the target network device.
  • Element 13 wherein the measurement report includes the DAPS-resources-available parameter.
  • Element 14 wherein the source network device communicates that the HO operation is delayed by at most a T-NW-DELAY parameter.
  • Element 15 wherein the UE performs the HO operation at earlier of an expiration of the T-NW- DELAY parameter or a time when the at least two PS can be utilized for the HO operation.
  • Element 16 wherein the measurement report includes the restricted-D APS -operation parameter.
  • Element 17 wherein the source network device communicates that a first PS from the at least two PS as a non-shared resource and assigned to one of the source network device or the target network device, and a second PS from the at least two PS as a shared resource and assigned to the other of the source network device or the target network device, and the second PS is shared by more than one USIM.
  • Element 18 wherein the second PS utilizes TDM.
  • Element 19 wherein the DAPS-resources-available parameter includes a T-UE-DELAY parameter.
  • Element 20 wherein the DAPS HO operation is delayed by the UE for earlier of an expiration of the T- NW-DELAY parameter or a time when two PS are available for the DAPS HO operation.
  • Element 21 wherein the DAPS-resources-available parameter includes a restricted-DAPS- operation parameter.
  • TDM time division multiplexing
  • Element 24 wherein the T-NW-DELAY parameter, the dedicated-PS-allocation parameter, or the non-DAPS-operation parameter are determined by the source network device utilizing received parameters from the target network device.

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

Abstract

La présente divulgation concerne un procédé de gestion d'une opération de transfert de pile de protocoles à double action (DAPS) d'une première station de base à une seconde station de base de communication avec un équipement utilisateur (UE) lorsque l'UE n'est pas en mesure de prendre en charge un transfert DAPS conformément aux normes 3GPP existantes. L'UE peut indiquer qu'il estime un retard de l'opération de transfert DAPS ou l'UE peut indiquer qu'une ou plusieurs des piles de protocoles (PS) doivent être partagées. La première station de base répond par une reconfiguration de connexion indiquant un temporisateur DAPS retardé, à quelle station de base la ressource PS partagée doit être attribuée, ou que des protocoles non DAPS seront utilisés. L'opération de transfert peut ensuite se poursuivre au moyen des paramètres de message de reconfiguration.
PCT/EP2021/072603 2020-08-25 2021-08-13 Commande de transfert dans une opération musim WO2022043097A1 (fr)

Applications Claiming Priority (2)

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IN202041036505 2020-08-25
IN202041036505 2020-08-25

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Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
3GPP TS 38.331
QUALCOMM INCORPORATED ET AL: "LTE DAPS handover UE RF chain requirements", vol. RAN WG2, no. Reno, USA; 20191118 - 20191122, 8 November 2019 (2019-11-08), XP051816759, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG2_RL2/TSGR2_108/Docs/R2-1914807.zip R2-1914807_LTE DAPS HO UE RF Chain Requirements_v2.doc> [retrieved on 20191108] *
QUALCOMM INCORPORATED: "Supporting per DRB DAPS HO configuration", vol. RAN WG2, no. Chongqing, CN; 20191014 - 20191018, 4 October 2019 (2019-10-04), XP051790346, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_107bis/Docs/R2-1912299.zip> [retrieved on 20191004] *
SPREADTRUM COMMUNICATIONS: "Considerations on the Multi-SIM study", vol. TSG RAN, no. Newport Beach, USA; 20190916 - 20190920, 10 September 2019 (2019-09-10), XP051782328, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/TSG_RAN/TSGR_85/Docs/RP-191768.zip> [retrieved on 20190910] *
TR 22.834
TR 23.761

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