WO2021174429A1 - Rapport de mesure dans un transfert intercellulaire - Google Patents

Rapport de mesure dans un transfert intercellulaire Download PDF

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Publication number
WO2021174429A1
WO2021174429A1 PCT/CN2020/077665 CN2020077665W WO2021174429A1 WO 2021174429 A1 WO2021174429 A1 WO 2021174429A1 CN 2020077665 W CN2020077665 W CN 2020077665W WO 2021174429 A1 WO2021174429 A1 WO 2021174429A1
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WIPO (PCT)
Prior art keywords
measurement
result
handover
configuration
frequency band
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PCT/CN2020/077665
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English (en)
Inventor
Jing He
Malgorzata Tomala
Tero Henttonen
Ping Yuan
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Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
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.)
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Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2020/077665 priority Critical patent/WO2021174429A1/fr
Priority to CN202080098071.3A priority patent/CN115211174B/zh
Publication of WO2021174429A1 publication Critical patent/WO2021174429A1/fr

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    • 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
    • H04W36/0085—Hand-off measurements

Definitions

  • Embodiments of the present disclosure generally relate to communication techniques, and more particularly, to methods, devices and computer readable medium for measurement report in handover.
  • Evolved-Universal Terrestrial Radio Access-New Radio refers to E-UTRA NR Dual connectivity. This feature allows mobile device to exchange data between itself and NR base station along with simultaneous connection with long term evolution (LTE) base station. This is possible when there is tight interworking between LTE and 5G NR base station has been established.
  • LTE long term evolution
  • embodiments of the present disclosure relate to a method for measurement report in handover and corresponding devices.
  • a method comprising receiving, at a first device and from a second device, a first configuration for a first measurement of signal strength on a first frequency band and a second configuration for a second measurement of signal strength on a second frequency band.
  • the method further comprises performing the first measurement of signal strength on the first frequency band and the second measurement of signal strength on the second frequency band.
  • the method yet comprises in accordance with a determination that at least one of a first result of the first measurement or a second result of the second measurement exceeds the threshold strength, determine whether the second measurement is related to the first measurement based on the first configuration or the second configuration.
  • the first device is further caused to in accordance with a determination that the second measurement is related to the first measurement, transmit the first result and available second result to the second device.
  • a method comprising transmitting, from a second device and to a first device, a first configuration for a first measurement of signal strength on a first frequency band, the first measurement being related to a second measurement of signal strength on a second frequency band.
  • the method further comprises receiving from the first device information at least indicating a first result of the first measurement.
  • the method also comprises transmitting to a third device a request for handover from the second device to the third device, the request at least comprising the received information.
  • a method comprising receiving, at a third device, a request for handover from a second device to the third device, the request at least indicating a first result of a first measurement of signal strength on a first frequency band.
  • the method also comprises in response to receiving the request, transmitting, to the second device, an acknowledgment at least comprising a first handover configuration for handover from the second device to the third device.
  • a first device comprising at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device to receive, from a second device, a first configuration for a first measurement of signal strength on a first frequency band and a second configuration for a second measurement of signal strength on a second frequency band.
  • the first device is further caused to perform the first measurement of signal strength on the first frequency band and the second measurement of signal strength on the second frequency band.
  • the first device is yet caused to in accordance with a determination that at least one of a first result of the first measurement or a second result of the second measurement exceeds the threshold strength, determining whether the second measurement is related to the first measurement based on the first configuration or the second configuration.
  • the method further comprises in accordance with a determination that the second measurement is related to the first measurement, transmitting the first result and available second result to the second device.
  • a second device comprising at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the second device to transmit, to a first device, a first configuration for a first measurement of signal strength on a first frequency band, the first measurement being related to a second measurement of signal strength on a second frequency band.
  • the second device is further caused to receive from the first device information at least indicating a first result of the first measurement.
  • the second device is also caused to transmit to a third device a request for handover from the second device to the third device, the request at least comprising the received information.
  • a third device comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the third device to receive, at a third device, a request for handover from a second device to the third device, the request at least indicating a first result of a first measurement of signal strength on a first frequency band.
  • the third device is further caused to in response to receiving the request, transmit, to the second device, an acknowledgment at least comprising a first handover configuration for handover from the second device to the third device.
  • an apparatus comprising means for receiving, at a first device and from a second device, a first configuration for a first measurement of signal strength on a first frequency band and a second configuration for a second measurement of signal strength on a second frequency band; means for performing the first measurement of signal strength on the first frequency band and the second measurement of signal strength on the second frequency band; means for in accordance with a determination that at least one of a first result of the first measurement or a second result of the second measurement exceeds the threshold strength, determining whether the second measurement is related to the first measurement based on the first configuration or the second configuration; and means for in accordance with a determination that the second measurement is related to the first measurement, transmitting the first result and available second result to the second device.
  • an apparatus comprising means for transmitting, from a second device and to a first device, a first configuration for a first measurement of signal strength on a first frequency band, the first measurement being related to a second measurement of signal strength on a second frequency band; means for receiving from the first device information at least indicating a first result of the first measurement; and means for transmitting to a third device a request for handover from the second device to the third device, the request at least comprising the received information.
  • an apparatus comprising means for receiving, at a third device, a request for handover from a second device to the third device, the request at least indicating a first result of a first measurement of signal strength on a first frequency band; and means for in response to receiving the request, transmitting, to the second device, an acknowledgment at least comprising a first handover configuration for handover from the second device to the third device.
  • a computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the above first , second or third aspect.
  • a computer program product that is stored on a computer readable medium and includes machine-executable instructions, wherein the machine-executable instructions, when being executed, cause the machine to perform the method according to the above first, second, or third aspect.
  • Fig. 1 illustrates a schematic diagram of a communication system according to according to some example embodiments of the present disclosure
  • Fig. 2 illustrates a schematic diagram of interactions between devices according to according to some example embodiments of the present disclosure
  • Figs. 3A and 3B illustrates a schematic diagram of interactions between devices according to according to some example embodiments of the present disclosure
  • Figs. 4A and 4B illustrates a schematic diagram of interactions between devices according to according to some example embodiments of the present disclosure
  • Fig. 5 illustrates a flow chart of a method according to some example embodiments of the present disclosure
  • Fig. 6 illustrates a flow chart of a method according to some example embodiments of the present disclosure
  • Fig. 7 illustrates a flow chart of a method according to some example embodiments of the present disclosure
  • Fig. 8 illustrates a simplified block diagram of an apparatus that is suitable for implementing embodiments of the present disclosure.
  • Fig. 9 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an example embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) , New Radio (NR) and so on.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • NR New Radio
  • the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.55G, the third generation (3G) , the fourth generation (4G) , 4.5G, the future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • suitable generation communication protocols including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.55G, the third generation (3G) , the fourth generation (4G) , 4.5G, the future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the a
  • the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR NB also referred to as a gNB
  • terminal device refers to any end device that may be capable of wireless communication.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/
  • RAT inter-radio access technology
  • EN-DC inter-radio access technology
  • a network device only can handover one terminal device from NR to LTE and then do secondary node (SN) addition to configure EN-DC after handover.
  • the newly agreed requirement is to introduce direct inter-RAT handover from NR to EN-DC, which can reduce signalling overhead and ensure consistent high data rate for enhanced mobile broadband (eMBB) service.
  • the procedure can be also referred to a one radio access technology (RAT e.g. NR) handover to another radio access technology (RAT e.g. LTE) with Secondary Node (SN) addition.
  • RAT direct inter-radio access technology
  • RAT intra-radio access technology
  • a measurement to potential target master node should be the one LTE frequency indicated by measurement result triggered by event B1 or B2.
  • the measurement to potential target secondary node should be A3, A4 or A5 to NR frequency.
  • LTE Event A1 is triggered when the serving cell becomes better than a threshold.
  • LTE Event A2 is triggered when the serving cell becomes worse than a threshold.
  • LTE Event A3 is triggered when a neighboring cell becomes better than the serving cell by an offset.
  • LTE Event A4 is triggered when a neighboring cell becomes better than a threshold.
  • Event A5 is triggered when the serving cell becomes worse than threshold-1 and neighboring cell becomes better than threshold-2.
  • Event A6 is triggered when the Intra Frequency Neighbor becomes offset better than Scell (Introduced in Rel 10 for CA) .
  • LTE Event B1 is triggered when a neighboring inter-RAT cell becomes better than a threshold.
  • LTE Event B2 is triggered when the serving cell becomes worse than threshold-1 and neighboring inter-RAT cell becomes better than threshold-2.
  • source NR network will initiate Inter-RAT handover to target LTE node based on B1/B2 measurement result only.
  • Target network will only consider triggering handover measurement result (B1 or B2 triggered) from a terminal device to command the terminal device to access target master node (MN) firstly.
  • MN target master node
  • target MN can blindly configure SN configuration without measurement to SN’s frequency (fast but not exact configuration) , or configure SN configuration after measurement to relative NR frequency (slow but exact configuration) .
  • the SN may appear weak in terms of signal level and may not be optimal selection of the cell to perform SN addition procedure.
  • a transmission of a first measurement of signal strength on a first frequency band are associated with a transmission of a second measurement of signal strength on a second frequency band.
  • the SgNB procedure to a proper SN is started earlier. In this way, a fast measurement to the second frequency band is implanted.
  • Fig. 1 illustrates a schematic diagram of a communication system in which embodiments of the present disclosure can be implemented.
  • the communication system 100 which is a part of a communication network, comprises a device 110-1, a device 110-2, ...., a device 110-N, which can be collectively referred to as “first device (s) 110. ”
  • the communication system 100 further comprises a second device 120, a third device 130, or a fourth device 130.
  • the communication system 100 may also comprise a core network device 150 which can be omitted.
  • One or more devices are associated with and covered by a cell. It is to be understood that the number of devices and cells shown in Fig. 1 is given for the purpose of illustration without suggesting any limitations.
  • the communication system 100 may comprise any suitable number of devices and cells.
  • the first device 110 and the second device 120 can communicate data and control information to each other.
  • a link from the second device 120 to the first device 110 is referred to as a downlink (DL)
  • a link from the first device 110 to the second device 120 is referred to as an uplink (UL) .
  • the number of devices shown in Fig. 1 is given for the purpose of illustration without suggesting any limitations.
  • the second device 120, third device 130 and the fourth device 140 can be network devices.
  • Communications in the communication system 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) and the fifth generation (5G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • s cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) and the fifth generation (5G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • IEEE Institute for Electrical and Electronics Engineers
  • the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple Access (OFDMA) and/or any other technologies currently known or to be developed in the future.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • MIMO Multiple-Input Multiple-Output
  • OFDMA Orthogonal Frequency Division Multiple Access
  • Fig. 2 illustrates a schematic diagram of interactions 200 among devices in accordance with some example embodiments of the present disclosure.
  • the interactions 200 may be implemented at any suitable devices. Only for the purpose of illustrations, the interactions 200 are described to be implemented at the first device 110-1, the second device 120, the third device 130, the fourth device 140 and the core network device 150. It should be noted that the interactions 200 are only examples not limitations.
  • the term “handover request” used herein may also be called as “handover required” . For example, if the handover request transmitted from the source network device to the core network, it is called handover required. Further, the target network device may reply handover Request Ack to core network and core network transmit handover Command to source network device.
  • the second device 120 generates 2005 a first configuration for a first measurement of signal strength on a first frequency band and a second configuration for a second measurement of signal strength on a second frequency band.
  • the first measurement and the second measurement are related.
  • both of the results may be transmitted to the second device together or separately.
  • the first configuration configured by the second device 120 may comprise B1/B2 measure object to measure signal strength on a LTE frequency.
  • the second configuration configured by the second device 120 may comprise A3/A4/A5 measure object to measure signal strength on a NR frequency, which may be secondary of the LTE frequency.
  • the first frequency band and the second frequency band can be any suitable frequency bands.
  • the indication may be represented as format of one frequency list, one list of cell IDs or one identification association of the first and second configuration.
  • the first measurement and the second measurement are associated with each other.
  • the second device 120 may generate an indication to indicate that the second measurement is related to the first measurement.
  • the indication may be included in the first configuration.
  • the second configuration may comprise the indication.
  • the first frequency band may be a LTE frequency band.
  • the first frequency band may be a NR frequency band.
  • the second frequency band may be a LTE frequency band.
  • the second frequency band may be a NR frequency band.
  • the second device 120 transmits 2010 the first configuration and/or the second configuration to the first device 110.
  • the first device 110-1 performs 2015 the first measurement and/or the second measurement.
  • the first measurement and/or the second measurement may indicate the first device 110-1 to measure reference signal received power (RSRP) .
  • the first device 110-1 may measure reference signal received quality (RSRQ) .
  • the first device 110-1 transmits 2020 information to the second device 120.
  • the information at least indicates a first result of the first measurement.
  • the information may also indicate available second result of the second measurement together or separated with the information that indicates a first result of the first measurement.
  • the first device 110-1 may transmit latest second result to the second device 120. Details of the interactions in section 210 are described with the reference to Figs. 3A and 3B, which illustrates example signaling according to some examples embodiments, respectively.
  • the second device 120 transmits 3010 the first configuration and transmits 3015 the second configuration to the first device 110-1.
  • the first configuration and the second configuration may be transmitted simultaneously by separate MeasObjects (MO) .
  • the first device 110-1 performs 3020 the first measurement and the second measurement simultaneously if received.
  • the first configuration may comprise the indication to indicate that the second measurement is related to the first measurement, where the indication may be the frequency list of the second measurement to measure, the list of measured cell IDs of the second measurement or the identification associated to measObjectID, measID or other available ID that can identify the second measurement.
  • the indication may be in the second configuration, which may be the frequency list of the first measurement to measure, the list of measured cell IDs of the first measurement or the identification associated to measObjectID, measID or other available ID that can identify the first measurement.
  • the first device 110-1 may also trigger the second measurement reporting regardless of the current event status.
  • the first device 110-1 transmits 3025 the information at least indicating the first result.
  • the information may indicate the first result and the available second result even though the second result does not meet transmission condition.
  • the first device 110-1 may determine a difference value between the second result and the threshold strength. The first device 110-1 may transmit 3025 the information indicating the first result and the difference value.
  • Fig. 3B illustrates example signaling to implement signals in section 210 according to some examples embodiments. Similar to the above, after generating 3105 the first configuration and the second configuration, the second device 120 transmits 3110 the first configuration to the first device 110-1. The first device 110-1 performs 3115 the first measurement on the first frequency band and transmits 3120 the first result to the second device 120. The second device 120 transmits 3125 the second configuration to the first device 110-1 after receiving the first result.
  • the second configuration may include one indication to ask the first device 110-1 to do measurement and report second result instantly; or include one timer to ask the first device 110-1 to do measurement and report second result no later than the timer expired. In some embodiments, the second configuration may indicate an indication.
  • the first device 110-1 performs 3130 the second measurement on the second frequency band.
  • the first device 110-1 transmits the second result of the second measurement instantly.
  • the second configuration may indicate a timer. In this situation, the first device 110-1 need to transmit the second result before the timer expires.
  • the second device 120 determines 2025 the third device 130 based on the first result of the first measurement. For example, the selected third device 130 may have a strongest signal strength.
  • the second device 120 transmits 2030 a handover request to the core network deice 150.
  • the handover request may indicate the first result.
  • the handover request may also indicate the second result.
  • the core network device 150 transmits 2035 the handover request to the third device 130.
  • the handover request may be determined based on the reception of the second result.
  • the third device 130 may determine a fourth device 140 as the secondary node based on the second result.
  • the third device 130 transmits 2040 the SN request to the fourth device 140.
  • the fourth device 140 transmits 2045 the SN acknowledgment to the third device. Details of the interactions in section 220 are described with the reference to Figs. 4A and 4B, which illustrates example signaling according to some examples embodiments, respectively.
  • the second device 120 determines 4005 the third device 130 based on the first result of the first measurement.
  • the first device 110-1 transmits 4010 the second result before the second device 120 transmits the request for handover.
  • the second result is received before the transmission of the request.
  • the second device 120 transmits 4015 the request indicating the first result and the second result to the core network device 150.
  • RRM-Config in the handover request needs to be extended to include candidateCellInfoListSN-NR for EN-DC (same as candidateCellInfoListSN-EUTRA defined for NE-DC) .
  • the core network device 150 transmits 4020 the handover request to the third device 130.
  • Fig. 4B illustrates example signaling to implement signals in section 220 according to some examples embodiments.
  • the second device 120 determines 4105 the third device 130 based on the first result of the first measurement.
  • the second device 120 transmits 4110 the request.
  • the request may indicate the first result.
  • the core network device 150 transmits 4115 the request to the third device 130.
  • the first device 110-1 transmits 4120 the second result after the second device 120 transmits 4110 the request.
  • the second result is received after the transmission of the request.
  • the second device 120 transmits 4125 a further request which comprise the second result to the core network device 150.
  • the second device 120 may transmit an inter-node message to inform the second result to the third device 130.
  • the core network device 150 transmits 4130 the further request to the third device 130.
  • the second device 120 may transmit a list of frequencies or cell identifications of serving cells to the third device 130.
  • the list of frequencies or cell identifications of serving cells may be transmitted in the further handover request.
  • the second device 120 may transmit the list of frequencies or cell identifications of serving cells in the request.
  • the handover request further indicates the second result of a second measurement of signal strength on a second frequency
  • the second device 120 may transmit the list of frequencies or cell identifications of serving cells to the third device 130.
  • the second device transmits the further handover request indicating a second result of a second measurement of signal strength on a second frequency before the reception of the acknowledgement, the list of frequencies or cell identifications of serving cells may be transmitted to the third device 130.
  • the list of frequencies or cell identifications of serving cells may be transmitted to the third device 130.
  • the third device 130 generates 2050 an acknowledgement to the handover request.
  • the third device 130 may allocate resources for the handover.
  • the third device 130 may generate a first handover configuration (for example, MN configuration) for the third device.
  • a second handover configuration for the fourth device 140 for example, SN configuration may be generated by the fourth device 140 and transmitted to the third device 130.
  • the third device 130 may transmit 2055 the acknowledgement which comprises the first handover configuration and the second handover configuration to the core network device 150.
  • the third device 130 may start SN addition procedure and the third device 130 may also transmit 2055 the acknowledgement which comprises the first handover configuration and the second handover configuration to the core network device 150.
  • the third device 130 may transmit 2055 the acknowledgement which comprises the first handover configuration to the core network device 150.
  • the third device 130 may start SN addition procedure as pre-configuration.
  • the core network device 150 may transmit 2060 the acknowledgement to the second device 120.
  • the second device 120 may transmit 2065 a handover indication to the first device 110-1.
  • the handover indication may comprise the first handover configuration.
  • the handover indication may comprise the second handover configuration.
  • the first device 110-1 may start 2070 a random access channel (RACH) access to the third device 130 based on the handover indication. If the second handover configuration is received, the first device 110-1 may start 2075 a RACH access to the fourth device 140.
  • RACH random access channel
  • the third device 130 may transmit the second handover configuration to the first device 110-1 via RRC signaling. For example, after the first device 110-1 successfully accesses to the third device 130, the third device 130 may transmit a RRC Connection Reconfiguration message indicating the second handover configuration. The first device 110-1 may connect to the fourth device 140 based on the second handover configuration in the RRC signaling.
  • Fig. 5 illustrates a flow chart of method 500 according to embodiments of the present disclosure.
  • the method 500 can be implemented at any suitable devices.
  • the method may be implemented at the first device 110-1.
  • the first device 110-1 receives a first configuration for a first measurement of signal strength on a first frequency band and a second configuration for a second measurement of signal strength on a second frequency band.
  • the first measurement and the second measurement are related.
  • both of the results may be transmitted to the second device together or separately.
  • the first configuration configured by the second device 120 may comprise B1/B2 measure object to measure signal strength on a LTE frequency.
  • the second configuration may comprise A3/A4/A5 measure object to measure signal strength on a NR frequency, which may be secondary of the LTE frequency.
  • the first frequency band and the second frequency band can be any suitable frequency bands.
  • an indication to indicate that the second measurement is related to the first measurement may be generated.
  • the indication may be included in the first configuration.
  • the second configuration may comprise the indication.
  • the first configuration and the second configuration may be transmitted simultaneously by separate MeasObjects (MO) .
  • MO MeasObjects
  • the first device 110-1 performs the first measurement and the second measurement simultaneously if received.
  • the first measurement and/or the second measurement may indicate the first device 110-1 to measure reference signal received power (RSRP) .
  • the first device 110-1 may measure reference signal received quality (RSRQ) .
  • the first device 110-1 determines whether the second measurement is related to the first measurement if one or more of the first result and the second result exceeds the threshold strength.
  • the first configuration or the second configuration may explicitly indicate that the first measurement and the second measurement are associated.
  • the first device 110-1 transmits information to the second device 120.
  • the information at least indicates a first result of the first measurement.
  • the information may also indicate a second result of the second measurement.
  • the first device 110-1 transmits the information at least indicating the first result.
  • the information may indicate the first result and the available second result even though the second result does not meet transmission condition.
  • the first device 110-1 may determine a difference value between the second result and the threshold strength. The first device 110-1 may transmit the information indicating the first result and the difference value.
  • the first device 110-1 may receive the second configuration from the second device 120 after transmitting the first result.
  • the second configuration may include one indication to ask the first device to do measurement and report second result instantly; or include one timer to ask the first device to do measurement and report second result no later than the timer expired.
  • the first device 110-1 transmits the second result of the second measurement after performing the second measurement on the second frequency band.
  • the first device 110-1 may receive from the second device 120 a handover indication.
  • the handover indication may comprise a first handover configuration for the third device 130 for handover from the second device 120 to the third device 130.
  • the second handover configuration for handover from the second device 120 to the third device 130 the fourth device 140 may be directly transmitted to the first device 110-1 via radio resource signaling.
  • the third device 130 may transmit a RRC Connection Reconfiguration message indicating the second handover configuration.
  • the first device 110-1 may connect to the fourth device 140 based on the second handover configuration in the RRC signaling.
  • Fig. 6 illustrates a flow chart of method 600.
  • the method 600 can be implemented at any suitable devices.
  • the method may be implemented at the second device 120.
  • the second device 120 transmits the first configuration to the first device 110-1.
  • the first configuration and the second configuration may be transmitted simultaneously.
  • the transmission of the second configuration may be triggered by the reception of the first result.
  • the second device 120 receives information at least indicating a first result of the first measurement.
  • the information may also indicate a second result of the second measurement.
  • the second device 120 receives the information at least indicating the first result.
  • the information may indicate the first result and the second result even though the second result does not meet transmission condition.
  • the information may indicate the first result and the difference value between the second result and the threshold strength. In this way, the second measurement is transmitted earlier.
  • the second device 120 may transmit the second configuration to the first device 110-1.
  • the order of the transmission of the second configuration and the reception of the first result can be changed.
  • the second device 120 transmits to the third device 130 a request for handover from the second device 120 to the third device 130.
  • the request at least indicates the information received at block 620.
  • the handover request may indicate the first result.
  • the handover request may also indicate the second result.
  • the second device 120 may determine the third device 130 based on the first result of the first measurement. For example, the selected third device 130 may have a strongest signal strength.
  • the second device 120 may receive the second result before transmitting the handover request.
  • the second result is received before the transmission of the handover request.
  • the second device 120 may transmit the handover request indicating the first result and the second result to the core network device 150.
  • RRM-Config in the handover request needs to be extended to include candidateCellInfoListSN-NR for EN-DC (same as candidateCellInfoListSN-EUTRA defined for NE-DC) .
  • the second device 120 may receive the second result after transmitting the handover request. In other words, the second result is received after the transmission of the handover request.
  • the second device 120 may transmit a further handover request which comprise the second result to the core network device 150.
  • the second device 120 may transmit an inter-node message to inform the second result to the core network device 150.
  • the second device 120 may receive the first handover configuration from the third device 130. Alternatively, the second device 120 may receive the first handover configuration and the second handover configuration.
  • Fig. 7 illustrates a flow chart of method 700.
  • the method 700 can be implemented at any suitable devices.
  • the method may be implemented at the third device 130.
  • the third device 130 receives a request for handover from the second device 120 to the third device 130.
  • the third device may generate an acknowledgement to the request.
  • the third device 130 may allocate resources for the handover.
  • the third device 130 may generate a first handover configuration (for example, MN configuration) for the third device.
  • a second handover configuration for the fourth device 140 for example, SN configuration may be generated by the fourth device 140 and transmitted to third device 130.
  • the third device 130 transmits an acknowledgment at least comprising the first handover configuration for the third device 130 to the second device 120 in response to receiving the request.
  • the third device 130 may transmit the acknowledgement which comprises the first handover configuration and the second handover configuration to the core network device 150.
  • the third device 130 may start SN addition procedure, and the third device 130 may also transmit the acknowledgement which comprises the first handover configuration and the second handover configuration to the core network device 150.
  • the third device 130 may transmit the acknowledgement which comprises the first handover configuration to the core network device 150.
  • the third device 130 may start SN addition procedure as pre-configuration.
  • the third device 130 may directly transmit the second handover configuration to the first device 110-1 via RRC signaling. For example, after the first device 110-1 successfully accesses to the third device 130, the third device 130 may transmit a RRC Connection Reconfiguration message indicating the second handover configuration directly to the first device 110-1. The first device 110-1 may connect to the fourth device 140 based on the second handover configuration in the RRC signaling.
  • an apparatus for performing the method 500 may comprise respective means for performing the corresponding steps in the method 500.
  • These means may be implemented in any suitable manners. For example, it can be implemented by circuitry or software modules.
  • the apparatus comprises means for receiving, at a first device and from a second device, a first configuration for a first measurement of signal strength on a first frequency band and a second configuration for a second measurement of signal strength on a second frequency band; means for performing the first measurement of signal strength on the first frequency band and the second measurement of signal strength on the second frequency band; means for in accordance with a determination that at least one of a first result of the first measurement or a second result of the second measurement exceeds the threshold strength, determine whether the second measurement is related to the first measurement based on the first configuration or the second configuration; and means for in accordance with a determination that the second measurement is related to the first measurement, transmit the first result and available second result to the second device.
  • the means for transmitting the first result and the available second result comprises means for transmitting the available second result together with the first result; or means for transmitting the available second result separate from the first result.
  • the apparatus further comprises means for in accordance with a determination that the second result of the second measurement is below the threshold strength, determining a difference value between the second result and the threshold strength; and means for transmitting to the second device the first result and the difference value.
  • the apparatus further comprises means for receiving, from the second device, a handover indication comprising a first handover configuration for handover from the second device to the third device.
  • the apparatus further comprises means for receiving, from a third device and via radio resource signaling, a second handover configuration for handover from the second device to the third device and a fourth device associated with the second frequency band.
  • the first device is a terminal device
  • the second device is a network device
  • the third device is a further network device.
  • an apparatus for performing the method 600 may comprise respective means for performing the corresponding steps in the method 600.
  • These means may be implemented in any suitable manners. For example, it can be implemented by circuitry or software modules.
  • the apparatus comprises means for transmitting, from a second device and to a first device, a first configuration for a first measurement of signal strength on a first frequency band, the first measurement being related to a second measurement of signal strength on a second frequency band a second configuration for the second measurement is be transmitted to the first deice; means for receiving from the first device information at least indicating a first result of the first measurement ; and means for transmitting to a third device a request for handover from the second device to the third device, the request at least comprising the received information.
  • the apparatus further comprises means for in response to receiving the information indicating the first result, transmitting a second configuration for the second measurement, the second configuration indicating an indication or a timer for the first device transmitting the second result.
  • the first configuration indicates that the second measurement is related to the first measurement.
  • the request is transmitted in response to receiving the second result.
  • the apparatus further comprises means for in response to receiving the second result after the transmission of the request, transmitting a further request indicating the second result to the third device for handover from the second device to the third device and a fourth device on the second frequency band.
  • the apparatus further comprises means for transmitting to the third device a list of cells related to the second frequency band.
  • the apparatus further comprises means for receiving from the third device an acknowledgment to the request, the acknowledgment at least indicating a handover configuration.
  • the apparatus further comprises means for in accordance with a determination that a second result of the second measurement is below the threshold strength, receiving from the first device the first result and a difference value between the second result and the threshold strength.
  • the first device is a terminal device
  • the second device is a network device
  • the third device is a further network device
  • the fourth device is another network device.
  • an apparatus for performing the method 700 may comprise respective means for performing the corresponding steps in the method 700.
  • These means may be implemented in any suitable manners. For example, it can be implemented by circuitry or software modules.
  • the apparatus comprises means for receiving, at a third device, a request for handover from a second device to the third device, the request at least indicating a first result of a first measurement of signal strength on a first frequency band; and means for in response to receiving the request, transmitting, to the second device, an acknowledgment at least comprising a first handover configuration for handover from the second device to the third device.
  • the apparatus further comprises means for in accordance with a determination that the request further indicates a second result of a second measurement of signal strength on a second frequency, transmitting, to the second device, an acknowledgment comprising a second handover configuration for handover from the second device to the third device and a fourth device associated with the second frequency band.
  • the apparatus further comprises means for in response to receiving a further request indicating a second result of a second measurement of signal strength on a second frequency before the transmission of the first handover configuration, generating a second handover configuration for handover from the second device to the third device and a fourth device associated with the second frequency band; and means for transmitting the acknowledgment comprising the second handover configuration to the second device.
  • the apparatus further comprises means for in response to receiving a further request indicating a second result of a second measurement of signal strength on a second frequency after the transmission of the first handover configuration, generating a second handover configuration for handover from the second device to the third device and a fourth device associated with the second frequency band; and means for transmitting the second handover configuration to a first device via radio resource signaling.
  • the apparatus further comprises means for receiving from the second device a list of cells related to a second frequency band; and means for determining a fourth device to be handed over from the second device to the fourth device based on the list of cells.
  • the second device comprises a network device and the third device comprises a further network device.
  • Fig. 8 is a simplified block diagram of a device 800 that is suitable for implementing embodiments of the present disclosure.
  • the device 800 may be provided to implement the communication device, for example the first device 110, the second device 120, the third device 130, the fourth device 140 as shown in Fig. 1.
  • the device 800 includes one or more processors 810, one or more memories 820 coupled to the processor 810, and one or more communication modules 840 coupled to the processor 810.
  • the communication module 840 is for bidirectional communications.
  • the communication module 840 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 810 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 800 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 820 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 824, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 822 and other volatile memories that will not last in the power-down duration.
  • a computer program 830 includes computer executable instructions that are executed by the associated processor 810.
  • the program 830 may be stored in the ROM 824.
  • the processor 810 may perform any suitable actions and processing by loading the program 830 into the RAM 822.
  • the embodiments of the present disclosure may be implemented by means of the program 820 so that the device 800 may perform any process of the disclosure as discussed with reference to Figs. 2 and 7.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 830 may be tangibly contained in a computer readable medium which may be included in the device 800 (such as in the memory 520) or other storage devices that are accessible by the device 800.
  • the device 800 may load the program 830 from the computer readable medium to the RAM 822 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • Fig. 9 shows an example of the computer readable medium 900 in form of CD or DVD.
  • the computer readable medium has the program 830 stored thereon.
  • NFV network functions virtualization
  • a virtualized network function may comprise one or more virtual machines running computer program codes using standard or general type servers instead of customized hardware. Cloud computing or data storage may also be utilized.
  • radio communications this may mean node operations to be carried out, at least partly, in a central/centralized unit, CU, (e.g. server, host or node) operationally coupled to distributed unit, DU, (e.g. a radio head/node) . It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts. It should also be understood that the distribution of labor between core network operations and base station operations may vary depending on implementation.
  • the server may generate a virtual network through which the server communicates with the distributed unit.
  • virtual networking may involve a process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network.
  • Such virtual network may provide flexible distribution of operations between the server and the radio head/node.
  • any digital signal processing task may be performed in either the CU or the DU and the boundary where the responsibility is shifted between the CU and the DU may be selected according to implementation.
  • a CU-DU architecture is implemented.
  • the device 800 may be comprised in a central unit (e.g. a control unit, an edge cloud server, a server) operatively coupled (e.g. via a wireless or wired network) to a distributed unit (e.g. a remote radio head/node) .
  • the central unit e.g. an edge cloud server
  • the distributed unit may be stand-alone apparatuses communicating with each other via a radio path or via a wired connection. Alternatively, they may be in a same entity communicating via a wired connection, etc.
  • the edge cloud or edge cloud server may serve a plurality of distributed units or radio access networks.
  • at least some of the described processes may be performed by the central unit.
  • the device 500 may be instead comprised in the distributed unit, and at least some of the described processes may be performed by the distributed unit.
  • the execution of at least some of the functionalities of the device 500 may be shared between two physically separate devices (DU and CU) forming one operational entity. Therefore, the apparatus may be seen to depict the operational entity comprising one or more physically separate devices for executing at least some of the described processes.
  • CU-DU architecture may provide flexible distribution of operations between the CU and the DU. In practice, any digital signal processing task may be performed in either the CU or the DU and the boundary where the responsibility is shifted between the CU and the DU may be selected according to implementation.
  • the device 500 controls the execution of the processes, regardless of the location of the apparatus and regardless of where the processes/functions are carried out.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the methods 300 and 400 as described above with reference to Figs. 3 and 4.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Des modes de réalisation de la présente invention concernent un rapport de mesure dans un transfert intercellulaire. Selon des modes de réalisation de la présente invention, une transmission d'une première mesure d'intensité de signal sur une première bande de fréquences est associée à une transmission d'une seconde mesure d'intensité de signal sur une seconde bande de fréquences. La procédure de gNB secondaire vers un nœud secondaire approprié est démarrée plus tôt. De cette manière, une mesure rapide de la seconde bande de fréquences est implantée.
PCT/CN2020/077665 2020-03-03 2020-03-03 Rapport de mesure dans un transfert intercellulaire WO2021174429A1 (fr)

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