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WO2022052104A1 - Procédés et appareils d'optimisation d'une interruption ho de liaison montante - Google Patents

Procédés et appareils d'optimisation d'une interruption ho de liaison montante Download PDF

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Publication number
WO2022052104A1
WO2022052104A1 PCT/CN2020/115073 CN2020115073W WO2022052104A1 WO 2022052104 A1 WO2022052104 A1 WO 2022052104A1 CN 2020115073 W CN2020115073 W CN 2020115073W WO 2022052104 A1 WO2022052104 A1 WO 2022052104A1
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Prior art keywords
rlc entity
pdcp
procedure
target cell
duplication
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PCT/CN2020/115073
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English (en)
Inventor
Ran YUE
Lianhai WU
Haiming Wang
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Lenovo Beijing Ltd
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Lenovo Beijing Ltd
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Priority to PCT/CN2020/115073 priority Critical patent/WO2022052104A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/026—Multicasting of data during hand-off

Definitions

  • the present application generally relates to wireless communication technology, and especially to methods and apparatuses for optimizing an uplink (UL) handover (HO) interruption.
  • UL uplink
  • HO handover
  • mobility interruption time means the shortest time duration supported by a wireless communication system during which a user equipment (UE) is not able to exchange user plane packets with any base station (BS) during transitions.
  • UE user equipment
  • BS base station
  • a HO interruption is caused by UL data switching from a source cell of a UE to a target cell of the UE.
  • the source and target cells may use different robust header compression (ROHC) frameworks, integrity protection mechanisms, and ciphering solutions. Therefore, during a HO procedure, a packet data convergence protocol (PDCP) entity can apply the similar structure with DAPS bearers. Also, a PDCP entity under 3GPP Release-15 can be applied with some enhancements on a ROHC framework, an integrity protection mechanism, and a ciphering solution.
  • ROHC robust header compression
  • DAPS has been specified as a solution of HO interruption reduction, there still may be a HO interruption in an UL of a UE. It is because simultaneous UL transmissions to both source and target cells of the UE are not supported.
  • 3GPP 5G networks are expected to increase network throughput, coverage, and robustness and reduce latency and power consumption. With the development of 3GPP 5G networks, various aspects need to be studied and developed to perfect the 5G technology.
  • One object of embodiments of the present disclosure is to provide novel mechanisms for optimizing an UL HO interruption of a UE.
  • Some embodiments of the present application provide a method, which may be performed by a UE.
  • the method includes: configuring a PDCP duplication for a packet associated with one or more radio link control (RLC) entities of the UE, wherein the one or more RLC entities are associated with at least one of a source cell of the UE and a target cell of the UE, and wherein the one or more RLC entities comprises a primary RLC entity and a secondary RLC entity; activating a PDCP duplication for a packet during a HO procedure of the UE; and simultaneously transmitting the duplicated packet to the source cell and the target cell; wherein the UE is configured with at least one of: an autonomous switching function, wherein the autonomous switching function switches the secondary RLC entity to the primary RLC entity; a multiple HO preparations function; and a function of allowing to deactivate a signaling radio bearer (SRB) .
  • RLC radio link control
  • the method may further include: upon detecting a HO failure, autonomously switching the secondary RLC entity to the primary RLC entity, wherein the primary RLC entity is associated with the target cell.
  • the method may further include: if the UE is configured with the autonomous switching function and in response to successfully completing one of a HO procedure and a DAPS HO procedure, autonomously switching the secondary RLC entity to the primary RLC entity, wherein the primary RLC entity is associated with the source cell.
  • the method may further include: if the UE is configured with the multiple HO preparations function and in response to satisfying a trigger condition, autonomously activating a PDCP duplication associated with a RLC entity associated with another target cell of the UE.
  • the method may further include: if the UE is configured with the function of allowing to deactivate a SRB, autonomously deactivating at least one duplicated SRB of the UE.
  • the method may further include: receiving a report related to a dual connectivity (DC) based HO procedure, wherein the DC based HO procedure is used for reducing a HO interruption of the UE, and wherein the report includes a bitmap, and the bitmap includes one or more bits corresponding to one or more PDCP service data units (SDUs) transmitted from the UE.
  • DC dual connectivity
  • the method may further include: receiving a report related to a DC based HO procedure, wherein the DC based HO procedure is used for reducing a HO interruption of the UE; determining whether a PDCP service data unit (SDU) is transmitted from the UE; and in response to determining that the PDCP SDU is transmitted from the UE and after receiving the report, considering the PDCP SDU as completely delivered.
  • SDU PDCP service data unit
  • the apparatus includes: a non-transitory computer-readable medium having stored thereon computer-executable instructions, a receiving circuitry; a transmitting circuitry; and a processor coupled to the non-transitory computer-readable medium, the receiving circuitry and the transmitting circuitry, wherein the computer-executable instructions cause the processor to implement the abovementioned method performed by a UE.
  • FIG. 1 illustrates a schematic diagram of a wireless communication system in accordance with some embodiments of the present application
  • FIG. 2 illustrates a flow diagram illustrating a method for optimizing an uplink HO interruption according to some embodiments of the present application.
  • FIG. 3 illustrates an apparatus according to some embodiments of the present application.
  • FIG. 1 illustrates a schematic diagram of a wireless communication system in accordance with some embodiments of the present application.
  • a wireless communication system 100 includes at least one UE 101 and at least one BS 102.
  • the wireless communication system 100 includes one UE 101 (e.g., UE 101a) and two BSs 102 (e.g., BS 102a and BS 102b) for illustrative purpose.
  • UE 101 e.g., UE 101a
  • BS 102a e.g., BS 102a and BS 102b
  • FIG. 1 a specific number of UE (s) 101 and BS (s) 102 are depicted in FIG. 1, it is contemplated that any number of UE (s) 101 and BS (s) 102 may be included in the wireless communication system 100.
  • the UE (s) 101 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , internet of things (IoT) devices, or the like.
  • computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , internet of things (IoT) devices, or the like.
  • computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet)
  • the UE (s) 101 may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network.
  • the UE (s) 101 includes wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like.
  • the UE (s) 101 may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art.
  • the UE (s) 101 may communicate directly with BSs 102 via UL communication signals.
  • each of the UE (s) 101 may be deployed an IoT application, an eMBB application and/or an URLLC application. It is contemplated that the specific type of application (s) deployed in the UE (s) 101 may be varied and not limited.
  • the BS (s) 102 may be distributed over a geographic region.
  • each of the BS (s) 102 may also be referred to as an access point, an access terminal, a base, a base unit, a macro cell, a Node-B, an evolved Node B (eNB) , a gNB, a NG-RAN (Next Generation-Radio Access Network) node, a Home Node-B, a relay node, or a device, or described using other terminology used in the art.
  • the BS (s) 102 is generally a part of a radio access network that may include one or more controllers communicably coupled to one or more corresponding the BS (s) 102.
  • the BS (s) 102 may communicate directly with each other.
  • the BS (s) 102 may communicate directly with each other via Xn interface or X2 interface.
  • the wireless communication system 100 may be compatible with any type of network that is capable of sending and receiving wireless communication signals.
  • the wireless communication system 100 is compatible with a wireless communication network, a cellular telephone network, a Time Division Multiple Access (TDMA) -based network, a Code Division Multiple Access (CDMA) -based network, an Orthogonal Frequency Division Multiple Access (OFDMA) -based network, an LTE network, a 3GPP-based network, a 3GPP 5G network, a satellite communications network, a high altitude platform network, and/or other communications networks.
  • TDMA Time Division Multiple Access
  • CDMA Code Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the wireless communication system 100 is compatible with the 5G new radio (NR) of the 3GPP protocol, wherein BS (s) 102 transmit data using an OFDM modulation scheme on the DL and the UE (s) 101 transmit data on the UL using a single-carrier frequency division multiple access (SC-FDMA) or OFDM scheme. More generally, however, the wireless communication system 100 may implement some other open or proprietary communication protocols, for example, WiMAX, among other protocols.
  • NR 5G new radio
  • BS (s) 102 transmit data using an OFDM modulation scheme on the DL
  • the UE (s) 101 transmit data on the UL using a single-carrier frequency division multiple access (SC-FDMA) or OFDM scheme.
  • SC-FDMA single-carrier frequency division multiple access
  • WiMAX Worldwide Interoperability for Microwave Access
  • the BS (s) 102 may communicate using other communication protocols, such as the IEEE 802.11 family of wireless communication protocols. Further, in some embodiments of the present application, the BS (s) 102 may communicate over licensed spectrums, whereas in other embodiments, the BS (s) 102 may communicate over unlicensed spectrums. The present application is not intended to be limited to the implementation of any particular wireless communication system architecture or protocol. In yet some embodiments of present application, the BS (s) 102 may communicate with the UE (s) 101 using the 3GPP 5G protocols.
  • Each BS (s) 102 may include one or more cells. Each UE (s) 101 may perform a cell section procedure between different cell (s) of different BS (s) . Each UE (s) 101 may handover from a serving cell of a source BS to a target cell of a target BS.
  • BS 102a may function as a source BS
  • BS 102b may function as a target BS. If there is a handover need, UE 101a as illustrated and shown in FIG. 1 may perform a HO procedure from a serving cell of BS 102a to a target cell of BS 102b, which depends a result of a cell selection procedure.
  • the HO procedure performed by UE 101a may be a HO procedure.
  • a UE in a DAPS HO procedure, a UE continues the downlink (DL) user data reception from a source BS until releasing resource (s) of the source cell, and the UE continues the UL user data transmission to the source BS until a successful random access procedure to a target BS.
  • DL downlink
  • s resource
  • the UE may synchronize to the target cell and complete a radio resource control (RRC) HO procedure by sending RRCReconfigurationComplete message to the target BS.
  • RRC radio resource control
  • the UE does not detach from the source cell upon receiving the RRCReconfiguration message.
  • the UE releases the source signaling radio bearer (SRB) resource (s) and security configuration of the source cell and stops the reception or the transmission on the DL or the UL with the source cell upon receiving an explicit release command from the target BS.
  • SRB source signaling radio bearer
  • an uplink transmission of a packet duplication on all or a part of configured legs is performing.
  • the leg may be also called a radio link control (RLC) leg, a RLC entity or a logical channel (LCH) .
  • RLC radio link control
  • LCH logical channel
  • a network may configure a packet data convergence protocol (PDCP) duplication.
  • PDCP packet data convergence protocol
  • the configured duplication for the indicated PDCP packet data unit (s) (PDU (s) ) is activated on the corresponding secondary leg (s) when some parameter (s) (e.g., a quality of service (QoS) requirement, the survival time, or the urgent time) is indicated to the UE.
  • QoS quality of service
  • the configured duplication for the indicated PDCP PDU (s) is activated on the corresponding secondary leg (s) when the QoS requirement is indicated to the UE and if reference signal received power (RSRP) of a cell corresponding to a primary leg for a packet duplication is lower than a threshold (the threshold may be configured by the network) .
  • RSRP reference signal received power
  • there is 1 primary RLC entity and 3 secondary RLC entities when the QoS requirement is indicated to the UE while RSRP of the cell corresponding to the primary RLC entity is lower than the threshold, the configured duplication for the indicated PDCP PDU (s) is activated on all the RLC entities (e.g., 1 primary RLC entity and 3 secondary RLC entities) .
  • the configured duplication for the indicated PDCP PDU (s) is activated on corresponding secondary RLC entities, when the QoS requirement is indicated to the UE and if RSRP of a cell corresponding to a primary RLC entity for a packet duplication is lower than a threshold (the threshold could be configured by the network) and RSRP of a cell corresponding to a secondary RLC entity for the packet duplication is higher than another threshold (the threshold could be configured by the network) and the secondary RLC entity is activated.
  • the two thresholds may be the same or different.
  • the configured duplication for the indicated PDCP PDU (s) is activated also on the remaining secondary RLC entities (e.g., the additional 2 secondary RLC entities) .
  • the PDCP layer may indicate (or note) the lower layers that duplication is activated when the activation is decided by PDCP layer.
  • the PDCP layer is indicated (or noted) by the lower layers that duplication is activated when the activation is decided by lower layers or upper layers.
  • the duplication is deactivated after the successful reception.
  • the duplication is deactivated on the corresponding secondary RLC entities when RSRP of a cell corresponding to the primary RLC entity is higher than a threshold and RSRP of a cell corresponding to the secondary RLC entity is lower than another threshold.
  • the thresholds may be configured by higher layer.
  • the duplication is deactivated when all the secondary RLC entities are deactivated.
  • a RRC reconfiguration message or a medium access control (MAC) control element can activate or deactivate the PDCP duplication.
  • MAC medium access control
  • CE control element
  • the handling UL duplication should be considered in several cases. For example, in a case of occurring a HO failure, according to the legacy solution, a UE falls back to a source connection if a source link is still available.
  • an issue of how to handle the UL duplication during a HO procedure needs to be solved.
  • an issue of how to enhance the signaling for a legacy duplication function also needs to be solved.
  • Embodiments of the present application implement an optimized procedure for a UE to autonomously switch a secondary leg to a primary leg.
  • a leg of the duplication may also be named as a RLC entity associated with the duplication, a path of the duplication, a logical channel (LCH) of the UE associated with the duplication, or the like.
  • Embodiments of the present application implement a solution to consider each PDCP SDU, if any, as being completely delivered after receiving a report from the network (e.g., a BS) .
  • FIG. 2 illustrates a flow diagram illustrating a method for optimizing an uplink HO interruption according to some embodiments of the present application.
  • the method illustrated in FIG. 2 may be implemented by a UE (e.g., the UE 101 as illustrated and shown in FIG. 1) . Although described with respect to a UE, it should be understood that other devices may be configured to perform a method similar to that of FIG. 2.
  • a UE configures a PDCP duplication for a packet associated with one or more RLC entities of the UE.
  • the one or more RLC entities of the duplication may also be named as a RLC entity associated with the duplication, a path of the duplication, a logical channel (LCH) of the UE associated with the duplication, or the like.
  • LCH logical channel
  • the one or more RLC entities of the UE may comprise a primary RLC entity and a secondary RLC entity.
  • the total quantity of a primary RLC entity or a secondary RLC entity within the one or more RLC entities of the UE may be different according to different embodiments of the present application.
  • the one or more RLC entities of the UE are associated with at least one of a source cell of the UE and a target cell of the UE.
  • the secondary RLC entity within the one or more RLC entities is associated with a source cell of the UE, while the primary RLC entity within the one or more RLC entities is associated with a target cell of the UE.
  • the secondary RLC entity is associated with a target cell of the UE, while the primary RLC entity is associated with a source cell of the UE.
  • the association restriction (s) may be specified in 3GPP specification document (s) or configured by a network (e.g., a BS) .
  • the UE activates a PDCP duplication for a packet during a HO procedure of the UE.
  • the UE may activate a PDCP duplication for a data radio bearer (DRB) , a SRB, a SRB packet, a DRB packet, a SDU, or a PDU during the HO procedure of the UE.
  • DRB data radio bearer
  • the UE simultaneously transmits the duplicated packet to the source cell and the target cell.
  • the UE may simultaneously transmit the duplicated DRB, the duplicated SRB, the duplicated packet of the SRB, the duplicated packets of the SRB, the duplicated SDU, or the duplicated PDU to the source cell and the target cell.
  • FIG. 2 Details described in the embodiments as illustrated and shown in FIGS. 1 and 3, especially, contents related to specific operations for optimizing an uplink HO interruption, are applicable for the embodiments as illustrated and shown in FIG. 2. Moreover, details described in the embodiments of FIG. 2 are applicable for all the embodiments of FIGS. 1 and 3.
  • the UE is configured with at least one of the following functions:
  • the autonomous switching function switches the secondary RLC entity to the primary RLC entity within the one or more RLC entities.
  • a multiple HO preparations function besides the abovementioned target cell of the UE, there may be one or more target cells of the UE.
  • a primary RLC entity within one or more RLC entities is associated with a target cell of a UE.
  • the UE may autonomously switch a secondary RLC entity to the primary RLC entity upon detecting a HO failure.
  • the HO failure is detected upon an expiry of a timer for handover.
  • the timer for handover may be timer T304 as specified in 3GPP standard document.
  • the primary RLC entity is associated with the target cell of the UE
  • the UE if the UE is configured with a multiple HO preparations function, there may be one or more target cells of the UE, besides the target cell of the UE with which the primary RLC entity is associated. Then, the UE may activate a PDCP duplication associated with a RLC entity which is associated with another target cell of the UE after the UE detects the HO failure.
  • the abovementioned embodiments in which the primary RLC entity is associated with the target cell of the UE, may include the following Cases 1-3.
  • a UE configures a PDCP duplication to be associated with both a RLC entity which is associated with a source cell of the UE and a RLC entity which is associated with a target cell of the UE.
  • the RLC entity which is associated with the source cell of the UE may represent a secondary RLC entity.
  • the RLC entity which is associated with the target cell of the UE may represent a primary RLC entity.
  • the UE may autonomously switch the secondary RLC entity to the primary RLC entity.
  • a UE configures a PDCP duplication to be associated with both a RLC entity which is associated with a source cell of the UE (that may represent a secondary RLC entity) and a RLC entity which is associated with a target cell of the UE (that may represent a primary RLC entity) .
  • the UE may be configured with an autonomous switching function.
  • the UE is configured and/or enabled to autonomously switch the secondary RLC entity.
  • the UE may autonomously switch the secondary RLC entity to the primary RLC entity.
  • At least one DRB of a UE is configured with a PDCP duplication for a HO procedure or a DAPS HO procedure.
  • restriction (s) for association relationship between RLC entities and a source cell or a target cell of the UE may be specified and performed in a RRC layer, a RLC layer, or a MAC layer of the UE.
  • the UE configures a secondary RLC entity of the UE to be associated with a target cell of the UE, and configures a primary RLC entity of the UE to be associated with a source cell of the UE.
  • the UE may autonomously switch the secondary RLC entity to the primary RLC entity.
  • a primary RLC entity within one or more RLC entities is associated with a source cell of a UE.
  • the UE may autonomously switch a secondary RLC entity to the primary RLC entity, if the UE is configured with an autonomous switching function and if a HO procedure or a DAPS HO procedure of the UE is successfully completed.
  • these embodiments, in which the primary RLC entity is associated with the source cell of the UE may include following Cases 4-6.
  • a UE configures a PDCP duplication to be associated with both a RLC entity which is associated with a source cell of the UE (that may represent a secondary RLC entity) and a RLC entity which is associated with a target cell of the UE (that may represent a primary RLC entity) .
  • the UE may autonomously switch the secondary RLC entity to the primary RLC entity.
  • a UE configures a PDCP duplication to be associated with both a RLC entity which is associated with a source cell of the UE (that may represent a secondary RLC entity) and a RLC entity which is associated with a target cell of the UE (that may represent a primary RLC entity) .
  • the UE is configured with an autonomous switching function.
  • the UE is configured and/or enabled to autonomously switch a secondary RLC entity to a primary RLC entity.
  • the UE may autonomously switch this secondary RLC entity to the primary RLC entity.
  • At least one DRB of a UE is configured with a PDCP duplication for a HO procedure or a DAPS HO procedure.
  • restriction (s) for association relationship between RLC entities and a source cell or a target cell of the UE may be specified and performed in a RRC layer, a RLC layer, or a MAC layer of the UE.
  • the UE configures a secondary RLC entity of the UE to be associated with a target cell of the UE, and configures a primary RLC entity of the UE to be associated with a source cell of the UE.
  • the UE configures a PDCP duplication to be associated with the secondary RLC entity and configures a PDCP duplication to be associated with the primary RLC entity.
  • the UE may autonomously switch this secondary RLC entity to the primary RLC entity.
  • a UE is configured with two or more secondary RLC entities.
  • the UE selects one secondary RLC entity from the configured two or more secondary RLC entities. If the UE is configured with an autonomous switching function, the UE may perform the autonomous switching function to switch the selected secondary RLC entity to the primary RLC entity.
  • Case 7 One specific case for these embodiments is described in following Case 7.
  • the UE may select the secondary RLC entity from the configured two or more secondary RLC entities according to different rules.
  • the selected secondary RLC entity may be:
  • RSRP reference signal received power
  • At least one DRB of a UE is configured with a PDCP duplication for a HO procedure or a DAPS HO procedure.
  • restriction (s) for association relationship between RLC entities and a source cell or a target cell of the UE may be specified and performed in a RRC layer, a RLC layer, or a MAC layer of the UE.
  • the UE configures a secondary RLC entity of the UE to be associated with a target cell of the UE, and configures a primary RLC entity of the UE to be associated with a source cell of the UE.
  • the UE configures a PDCP duplication to be associated with at least one of the secondary RLC entity and the primary RLC entity.
  • a target cell of a UE is configured with a DC operation.
  • a UE detects whether a radio link failure (RLF) occurs in a target cell of the UE after the UE accesses to the target cell and before the UE receives a DAPS release command.
  • RLF radio link failure
  • the UE may perform a fast master cell group (MCG) link recovery procedure.
  • MCG fast master cell group
  • the UE may maintain a RLC entity associated with a source cell of the UE.
  • a target cell of a UE is configured with a DC operation.
  • a UL duplication HO procedure is configured for a DRB of the UE.
  • the UE support more than two MAC entities.
  • the UE performs a fast MCG link recovery procedure when a RLF occurs in a target cell and after UE accesses to the target cell as well as before the UE receives a DAPS release command.
  • the source link is maintained by the UE.
  • the UE can continue a data transmission on the source link.
  • a network may configure the UL PDCP duplication for a HO procedure by a HO command.
  • the network may perform at least one of the following operations:
  • the network configures one or more target cells.
  • Each of the target cells is associated with one or more RLC entities;
  • a state of the activation or deactivation operation is indicated in a configuration message or a signaling which is transmitted from the network.
  • the network may indicate a RLC duplication state, e.g., an activated state or a deactivated state.
  • a network e.g., a BS
  • an index "RLCi" may indicate an activated state or a deactivated state of a PDCP duplication for the RLC entity "i" .
  • the network may perform at least one of the following operations:
  • the network pre-configures one or more target cells.
  • Each of the target cells is associated with one or more RLC paths.
  • the MAC CE can be per RLC entity or can be a bitmap for all the configured RLC entities.
  • the network may use one or more MAC CEs, each of which corresponds to one RLC entity.
  • the network may use a MAC CE, which includes a bitmap corresponding to all the configured RLC entities.
  • the UE may autonomously activate a PDCP duplication associated with a RLC entity associated with another target cell of the UE.
  • the trigger condition includes: the UE detects a HO failure based on a DAPS failure; and the UE determines that the source cell of the UE is not available.
  • the UE may autonomously deactivate at least one duplicated SRB of the UE.
  • the at least one duplicated SRB may be autonomously deactivated based on a specific SRB message.
  • the UE may temporarily autonomously deactivate at least one duplicated SRB of the UE when a specific SRB message is received on the at least one duplicated SRB.
  • the UE may temporarily autonomously deactivate at least one duplicated SRB of the UE when a specific SRB message is transmitted on the at least one duplicated SRB.
  • the specific SRB message is a measurement report
  • the UE temporarily autonomously deactivates at least one duplicated SRB of the UE when the measurement report is transmitted on the at least one duplicated SRB.
  • each operation in the following specific Case 9 can be applied separately or be applied together with at least one of the above cases.
  • a UE can deactivate a RLC entity associated with a source cell (e.g., a source cell A) , if a HO procedure is successfully completed and all UL retransmissions which are configured to be retransmitted in the source cell have succeeded or been completed.
  • the UE can deactivate a RLC entity associated with a source cell (e.g., a source cell A) , if all the unacknowledged SDUs are discarded.
  • This deactivation operation can be prior to a reception of an uplink data switching request or a deactivation signaling from a network (e.g., a BS) or a similar signaling from the network.
  • a network e.g., a BS
  • the UE can deactivate a RLC entity associated with a source cell (e.g., a source cell A) , if a HO procedure is successfully completed and a UL retransmission in source cell has succeeded.
  • a source cell e.g., a source cell A
  • the UE can deactivate a RLC entity associated with a source cell (e.g., a source cell A) , if all the unacknowledged SDU are discarded.
  • This deactivation operation can be prior to the reception of uplink data switching request or a deactivation signaling from a network (e.g., a BS) or a similar signaling from the network.
  • a network e.g., a BS
  • This deactivation operation may be based on a specific SRB message, for example, MeasurementReport.
  • a UE is configured with a function of allowing to deactivate a SRB
  • the UE may temporarily autonomously deactivate at least one duplicated SRB of the UE when MeasurementReport is transmitted on the at least one duplicated SRB.
  • the UE can activate another RLC entity associated with another target cell (e.g., a target cell C) which is configured by the network.
  • a sequence of the RLC entities to be activated can be configured.
  • An UL PDCP duplication for a HO procedure can be activated by the UE.
  • the activation can be triggerred by a DL message, for example RRCReconfiguration message.
  • the activation can be triggerred by an UL message, for example, RRCReconfigurationComplete message.
  • the UE may initiate the activation operation or the deactivation operation and use a MAC CE to indicate the state of each of the RLC entities configured with the PDCP duplication to a network (e.g., a BS) .
  • the sate of a RLC entity may be an activation sate or a deactivation sate.
  • a UE in order to calculate a data volume, if a primary RLC entity and a secondary RLC entity are configured, a UE may indicate the data volume according to the association relationship. For example, if the primary RLC entity is associated with a target cell, the UE may indicate the target PDCP data volume to the MAC entity associated with the primary RLC entity. If the secondary RLC entity is associated with a source cell, the UE may indicate the source PDCP data volume to the MAC entity associated with the secondary RLC entity. If a PDCP duplication is activated for a HO procedure, each operation in the following specific Case 10 can be applied separately or be applied together with at least one of the above cases.
  • a UE indicates a source PDCP data volume to a MAC entity associated with a source RLC entity.
  • the UE indicates a target PDCP data volume to a MAC entity associated with a target RLC entity.
  • the UE indicates the source PDCP data volume, which excludes a PDCP control PDU, to the MAC entity associated with a source RLC entity, if there is any other source RLC entity (other than the source RLC entity mentioned in step (1) ) which is activated for a PDCP duplication.
  • the UE indicates the target PDCP data volume, which excludes a PDCP control PDU, to the MAC entity associated with a target RLC entity, if there is any other target RLC entity (other than the target RLC entity mentioned in step (2) ) which is activated for a PDCP duplication.
  • the UE If the UE deactivates a PDCP duplication for a RLC entity, the UE sets 0 to the PDCP data volume and indicates the PDCP data volume 0 to the MAC entity which is associated with the RLC entity.
  • each operation in the following specific Case 11 can be applied separately or be applied together with at least one of the above cases.
  • a UE duplicates a PDCP Data SDU or a PDCP Data PDU.
  • the duplicated SDU or PDU can include each PDCP SDU which is already associated with a PDCP secondary node (SN) but for which a corresponding PDU has not previously been submitted to lower layers.
  • SN PDCP secondary node
  • the UE submits a source PDCP Data PDU to the associated source RLC entity (or entities) activated for a PDCP duplication.
  • the UE submits a target PDCP Data PDU to the associated target RLC entity (or entities) activated for a PDCP duplication.
  • the UE submits a source PDCP Control PDU to the associated source RLC entity (or entities) activated for a PDCP duplication.
  • the UE submits a target PDCP Control PDU to the associated target RLC entity (or entities) activated for a PDCP duplication.
  • a UE receives a report related to a DC based HO procedure.
  • the DC based HO procedure may be used for reducing a HO interruption of the UE.
  • the report may include a bitmap, and the bitmap includes one or more bits corresponding to one or more PDCP SDUs transmitted from the UE.
  • the report may also be named as a state report or a status report.
  • the UE further determines whether a PDCP SDU has been transmitted from the UE. If the UE determines that the PDCP SDU has been transmitted from the UE and the UE has received the report, the UE may consider that the PDCP SDU has been completely delivered.
  • Some embodiments of the present application may include at least one of the following operations:
  • the status report related to a DC based HO procedure is configured and/or enabled by a network (e.g., a BS) .
  • a network e.g., a BS
  • the receiving PDCP entity of the UE shall trigger a PDCP status report when:
  • the transmitting PDCP entity of the UE shall:
  • each transmitted PDCP SDU as being completely delivered, no matter whether the bit corresponding to each transmitted PDCP SDU in the bitmap set is '0' or ‘1’ .
  • the transmission to the source cell can be deactivated.
  • the transmission to the source cell can be deactivated, if the associated COUNT value of a first missing count (FMC) field is less than the associated COUNT value of the first duplicated SDU when a PDCP duplication for a HO procedure is activated.
  • FMC first missing count
  • the target PDCP entity of the UE shall:
  • - maintain the initiation and refresh state (IR) or ROHC related information to the target cell.
  • FIG. 3 illustrates an apparatus according to some embodiments of the present application.
  • the apparatus 300 may be the UE 101 as illustrated and shown in FIG. 1 or other embodiments of the present application.
  • the apparatus 300 may be the BS 102 as illustrated and shown in FIG. 1 or other embodiments of the present application.
  • the apparatus 300 may include a receiver 301, a transmitter 303, a processer 305, and a non-transitory computer-readable medium 307.
  • the non-transitory computer-readable medium 307 has computer executable instructions stored therein.
  • the processer 305 is configured to be coupled to the non-transitory computer readable medium 307, the receiver 301, and the transmitter 303.
  • the apparatus 300 may include more computer-readable mediums, receiver, transmitter and processors in some other embodiments of the present application according to practical requirements.
  • the receiver 301 and the transmitter 303 are integrated into a single device, such as a transceiver.
  • the apparatus 300 may further include an input device, a memory, and/or other components.
  • the non-transitory computer-readable medium 307 may have stored thereon computer-executable instructions to cause a processor to implement the method according to embodiments of the present application.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • the steps of a method may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.
  • the terms “comprises, “ “comprising, “ or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
  • An element proceeded by “a, “ “an, “ or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
  • the term “another” is defined as at least a second or more.
  • the terms “including, “ “having, “ and the like, as used herein, are defined as “comprising. "

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

Abstract

Des modes de réalisation de la présente divulgation concernent des procédés et appareils servant à déterminer une interruption de transfert intercellulaire (HO) de liaison montante. Selon un mode de réalisation de la présente divulgation, un procédé consiste : à configurer une duplication de protocole de convergence de données par paquets (PDCP) pour un paquet associé à une ou à plusieurs entités de commande de liaison radioélectrique (RLC) d'un équipement utilisateur (UE), la ou les entités RLC étant associées à une cellule source de l'UE et/ou à une cellule cible de l'UE et comprenant une entité RLC primaire et une entité RLC secondaire; à activer la duplication PDCP pour le paquet pendant un procédé HO de l'UE; à transmettre simultanément le paquet dupliqué à la cellule source et à la cellule cible; l'UE étant configuré avec : une fonction de commutation autonome qui commute de l'entité RLC secondaire vers l'entité RLC primaire, et/ou une fonction de préparations de HO multiples, et/ou une fonction permettant de désactiver un support radioélectrique de signalisation (SRB).
PCT/CN2020/115073 2020-09-14 2020-09-14 Procédés et appareils d'optimisation d'une interruption ho de liaison montante Ceased WO2022052104A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019161099A1 (fr) * 2018-02-15 2019-08-22 Qualcomm Incorporated Transfert travail repos amélioré
WO2020147776A1 (fr) * 2019-01-18 2020-07-23 FG Innovation Company Limited Duplication sous protocole de convergence de données par paquets dans des réseaux sans fil de prochaine génération
CN111586769A (zh) * 2019-02-15 2020-08-25 华为技术有限公司 无线通信系统中的切换方法、装置及系统

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Publication number Priority date Publication date Assignee Title
WO2019161099A1 (fr) * 2018-02-15 2019-08-22 Qualcomm Incorporated Transfert travail repos amélioré
WO2020147776A1 (fr) * 2019-01-18 2020-07-23 FG Innovation Company Limited Duplication sous protocole de convergence de données par paquets dans des réseaux sans fil de prochaine génération
CN111586769A (zh) * 2019-02-15 2020-08-25 华为技术有限公司 无线通信系统中的切换方法、装置及系统

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LG ELECTRONICS INC.: "Reordering at handover", 3GPP DRAFT; R2-080968_REORDERING_AT_HANDOVER_CR_V805_36323-800_CLEAN, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Sorrento, Italy; 20080205, 5 February 2008 (2008-02-05), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP050138766 *

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