WO2021258298A1 - Procédés, dispositifs et support lisible par ordinateur de communication - Google Patents

Procédés, dispositifs et support lisible par ordinateur de communication Download PDF

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Publication number
WO2021258298A1
WO2021258298A1 PCT/CN2020/097773 CN2020097773W WO2021258298A1 WO 2021258298 A1 WO2021258298 A1 WO 2021258298A1 CN 2020097773 W CN2020097773 W CN 2020097773W WO 2021258298 A1 WO2021258298 A1 WO 2021258298A1
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WIPO (PCT)
Prior art keywords
information
terminal device
network device
broadcast service
identity
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PCT/CN2020/097773
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English (en)
Inventor
Gang Wang
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Nec Corporation
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Publication date
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Priority to PCT/CN2020/097773 priority Critical patent/WO2021258298A1/fr
Publication of WO2021258298A1 publication Critical patent/WO2021258298A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1836—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with heterogeneous network architecture
    • 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
    • H04W36/0009—Control or signalling for completing the hand-off for a plurality of users or terminals, e.g. group communication or moving wireless networks

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods, devices, and computer readable medium for communication.
  • Multicast/Broadcast is supported in new radio (NR) systems.
  • NR new radio
  • Dynamic change of Broadcast/Multicast service delivery between multicast (PTM) and unicast (PTP) with service continuity for a given terminal device has also been supported.
  • PTM multicast
  • PTP unicast
  • the network schedules a number of signalling overhead to Broadcast/Multicast downlink data for all/group UE in a cell. So, if the number of terminal devices in a cell who are interested in Broadcast/Multicast is too less, then the network should switch from point-to-mutli-points (PTM) transmission to point-to-point (PTP) transmission.
  • PTM point-to-mutli-points
  • PTP point-to-point
  • example embodiments of the present disclosure provide a solution for communication.
  • a terminal 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 terminal device to perform acts, the acts comprising: generating information about a broadcast service associated with the terminal device; and transmitting the information to a network device during a random access procedure with the network device.
  • a network 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 network device to perform acts, the acts comprising: receiving, from a terminal device, information about a broadcast service associated with the terminal device, during a random access procedure with the terminal device; and determining the number of terminal devices associated with the broadcast service based on the information.
  • a method comprises generating, at a terminal device, information about a broadcast service associated with the terminal device; and transmitting the information to a network device during a random access procedure with the network device.
  • a method comprises receiving, at a network device and from a terminal device, information about a broadcast service associated with the terminal device, during a random access procedure with the terminal device; and determining the number of terminal devices associated with the broadcast service based on the information.
  • an apparatus comprising means for generating information about a broadcast service associated with the terminal device; and means for transmitting the information to a network device during a random access procedure with the network device.
  • an apparatus comprising means for receiving, at a network device and from a terminal device, information about a broadcast service associated with the terminal device, during a random access procedure with the terminal device; and means for determining the number of terminal devices associated with the broadcast service based on the information.
  • a computer readable medium comprises program instructions for causing an apparatus to perform at least the method according to any one of the above third and fourth aspects.
  • Figs. 1A and 1B illustrate signaling flows for random access procedures according to conventional technologies, respectively;
  • Fig. 2 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented
  • Fig. 3 illustrates a signaling flow for counting terminal devices according to some embodiments of the present disclosure
  • Fig. 4 illustrates a flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure
  • Fig. 5 illustrates a flowchart of a method implemented at a network device according to some other example embodiments of the present disclosure.
  • Fig. 6 illustrates a simplified block diagram of an apparatus that is suitable for implementing example embodiments of the present disclosure.
  • the term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an Evolved NodeB (eNodeB or eNB) , a NodeB in new radio access (gNB) a Remote Radio Unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a low power node such as a femto node, a pico node, a satellite network device, an aircraft network device, and the like.
  • NodeB Node B
  • eNodeB or eNB Evolved NodeB
  • gNB NodeB in new radio access
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • a low power node such as a femto node, a pico node, a satellite network
  • terminal device refers to any device having wireless or wired communication capabilities.
  • Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • UE user equipment
  • Communications discussed herein may use conform to any suitable standards including, but not limited to, New Radio Access (NR) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , cdma2000, and Global System for Mobile Communications (GSM) and the like.
  • NR New Radio Access
  • LTE Long Term Evolution
  • LTE-A LTE-Evolution
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.85G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
  • the techniques described herein may be used for the
  • values, procedures, or apparatus are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • Random Access Channel can be contention based (CBRA) or contention free (CFRA) .
  • CBRA contention based
  • CFRA contention free
  • the terminal device 110 may start the random access procedure by sending 1001 a Random Access Preamble (i.e., Msg1) to the network device 120. If the network device 120 receives the Random Access Preamble successfully, it may transmit 1002 a Random Access Response (RAR) (i.e., Msg2) which contains the identity of the detected preamble, the time-advance, a temporary Cell Radio Network Temporary Identifier (C-RNTI) and an uplink grant for scheduling a physical uplink shared channel (PUSCH) transmission by the terminal device 110.
  • RAR Random Access Response
  • Msg3 a scheduled transmission
  • the network device 120 may send 1004 a contention resolution message (i.e., Msg4) to indicate whether there was contention or whether the transmission by the terminal device 110 was successful.
  • 2-step CBRA has been introduced to reduce the number of round-trips required until the RACH procedure is successful from 2 round-trips to 1.
  • the terminal device 110 may transmit 1011 Msg A which includes a combination of the Msg1 and Msg3.
  • the network device 120 may transmit 1012 Msg B which includes a combination of the Msg2 and Msg4. Due to its property of minimizing RACH channel occupancy until successful RACH access, 2-step RACH has been also used for Listen Before Talk (LBT) in unlicensed access.
  • LBT Listen Before Talk
  • a terminal device transmits information of a broadcast service associated with the terminal device to a network device during a random access procedure.
  • the network device determines the number of terminal devices associated with the broadcast service. In this way, the network device determines whether to switch from PTP to PTM or from PTM to PTP based on the number of terminal devices, such that signaling is saved and communication performances are improved.
  • Fig. 2 illustrates a schematic diagram of a communication environment 200 in which embodiments of the present disclosure can be implemented.
  • the communication environment 200 which is a part of a communication network, comprises a terminal device 210-1, a terminal device 210-2, ...., a terminal device 210-N, which can be collectively referred to as “terminal device (s) 210. ”
  • the communication environment 200 further comprises a network device 220-1, a network device 220-2, a network device 220-M, which can be collectively referred to as “network device (s) 220. ” that can communicate with the first device (s) 210.
  • the communication environment 200 may comprise any suitable number of devices and cells.
  • the terminal devices 210 and the network devices 220 can communicate data and control information to each other.
  • the network devices 220 can also exchange information with each other.
  • the environment 200 may include any suitable number of devices and networks adapted for implementing embodiments of the present disclosure.
  • Communications in the communication environment 200 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 (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) 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
  • OFDM Orthogonal Frequency Division Multiple
  • DFT-s-OFDM Discrete Fourier Transform spread OFDM
  • Fig. 3 illustrates a signaling flow 300 for counting terminal devices according to example embodiments of the present disclosure.
  • the signaling flow 300 will be described with reference to Fig. 2. Only for the purpose of illustrations, the signaling flow 300 may involve the terminal device 210-1, the network device 220-1 and the network device 220-2.
  • the terminal device 220-1 generates 3005 information of a broadcast service associated with the terminal device 210-1.
  • the terminal device 210-1 may be in RRC_INACTIVE state.
  • the information may comprise an identity of the terminal device.
  • the information may also comprise a downlink bandwidth part associated with the broadcast service.
  • the information may comprise an identity of the broadcast service.
  • the identity can be extended due to diversity of services. For example, the identity can be extended to 4, 5, 6, 7, 8, or any suitable integer. If the identity is extended to 8, it means that the number of services can be 2 8 .
  • the information may comprise an indication to indicate whether the terminal device 210-1 needs the broadcast service. In other words, it indicates whether the terminal device 210-1 interests in the broadcast service.
  • the information may comprise a plurality of identities of a plurality of broadcast services. For each of the plurality broadcast services, the information may comprise one indication to indicate whether the terminal device 210-1 is interested in the corresponding broadcast service.
  • the indication may be represented as counting cause in the information. If the terminal device 210-1 needs (interests in) the broadcast service, the number of terminal devices associated with the broadcast service may be increased. Alternatively, if the terminal device 210-1 does not interest in the broadcast service, the number of terminal devices associated with the broadcast service may be decreased. In this way, the network device 210-1 is able to count the number of terminal network devices which interest in the broadcast services.
  • the network device 210- may switch from point-to-point transmission to point-to-multi points transmission based on the number, thereby saving signaling.
  • the information may comprise a valid duration of the information.
  • the valid duration may be a terminal device preferred valid duration.
  • the valid duration may be set to 0, which means that the network device 220-2 may discount the broadcast service interests of the terminal device 210-1. For example, if the valid duration is set to 60 minutes and the information indicates that the terminal device 210-1 interests the broadcast service, it means that the terminal device 210-1 is interested in the broadcast service for 60 minutes. It should be notes that the valid duration can be any suitable durations.
  • an identity of a last reported cell may be included in the information.
  • the information may comprise a physical cell ID of the last reported cell.
  • Table 1 below shows an example codes of the information where the terminal device 210-1 is in the RRC-INACTIVE state.
  • the terminal device 210-1 may be RRC_IDLE state.
  • the information may comprise a downlink bandwidth part associated with the broadcast service.
  • the information may comprise an identity of the broadcast service.
  • the identity can be extended due to diversity of services. For example, the identity can be extended to 4, 5, 6, 7, 8, or any suitable integer. If the identity is extended to 8, it means that the number of services can be 2 8 .
  • the information may comprise an indication to indicate whether the terminal device 210-1 is interested in the broadcast service. In other words, it indicates whether the terminal device 210-1 interests in the broadcast service.
  • the indication may be represented as counting cause in the information.
  • the counting cause may represent MBMS counting which means the terminal device 210-1 is interested in this broadcast service.
  • the counting cause may represent MBMS Discount which means the terminal device 210-1 is no longer interested in the broadcast service. If the terminal device 210-1 is interested in (interests in) the broadcast service, the number of terminal devices associated with the broadcast service may be increased. Alternatively, if the terminal device 210-1 does not interest in the broadcast service, the number of terminal devices associated with the broadcast service may be decreased. In this way, the network device 210-1 is able to count the number of terminal network devices which interest in the broadcast services.
  • the network device 210- may switch from point-to-point transmission to point-to-multi points transmission based on the number, thereby saving signaling.
  • the information may comprise a valid duration of the information.
  • the valid duration may be set to 0, which means that the network device 220-2 may discount the broadcast service interests of the terminal device 210-1. For example, if the valid duration is set to 30 minutes and the information indicates that the terminal device 210-1 does not interest in the broadcast service, it means that the terminal device 210-1 does not the broadcast service during 30 minutes. It should be notes that the valid duration can be any suitable durations.
  • an identity of a last reported cell may be included in the information.
  • the information may comprise a physical cell ID of the last reported cell.
  • Table 2 below shows an example codes of the information where the terminal device 210-1 is in the RRC-IDEL state.
  • the terminal device 210-1 transmits 3010 the information to the network device 210-1 during a random access procedure with the network device 210-1.
  • the information may be transmitted in Msg 3.
  • the terminal device 210-1 may transmit the information in Msg A.
  • the network device 220-1 determines 3015 the number of terminal devices 210 associated with the broadcast service based on the information. For example, if the information indicates that the terminal device 210-1 is interested in the broadcast service, the network device 220-1 may update the number of terminal devices by one. Alternatively, if the information indicates that the terminal device 210-1 is not interested in the broadcast service, the number of terminal devices may be decreased. In this way, the network device 210-1 is able to count the number of terminal network devices which interest in the broadcast services. The network device 210-1 may determine whether to switch a first transmission mode to a second transmission mode based on the number of terminal devices. For example, if the number of terminal devices exceeds a threshold number, the network device 210-1 may switch from PTP transmission to PTM transmission.
  • the network device 210-1 may switch from PTM transmission to PTP transmission.
  • the first transmission mode and the second transmission mode can be any suitable transmission modes, for example, broadcast transmission mode, groupcast transmission mode, single cast transmission mode.
  • the network device 210-1 may determine that point-to-multi points transmission is needed, thereby saving signaling.
  • the network device 220-1 may transmit 3020 further information which indicates the identity of the terminal device 210-1 during the random access procedure.
  • the network device 220-2 may transmit the identity of the terminal device 210-1 to finalize the contention resolution. For example, the network device 220-1 may obtain the identity of the terminal device 210-1.
  • the network device 220-1 may transmit the identity of the terminal device 210-1 in Msg 4. In other embodiments, the identity of the terminal device may be transmitted in Msg B. In a yet embodiment, the network device 220-1 may transmit Msg B to the terminal device 210-1 without the identity of the terminal device 210-1.
  • the network may only count the number of terminal devices which are interested in the broadcast service, the identity of the terminal device is unnecessary to be identified by the network, in resulting the contention resolution can be ignored. So the network device 220-1 may not send the further information to the terminal device 210-1.
  • the terminal device 210-1 may determine 3025 to switch from a source cell to a target cell.
  • the target cell may be selected from neighbor cells based on signal quality and/or signal power.
  • the counting information of the source cell may be updated.
  • the terminal device 210-1 may transmit the information to the network device 210-which serves the source cell before switching to the target cell before performing the cell switch to the target cell.
  • the indication in the information may indicate that the terminal device 210-1 is not interested in the broadcast service.
  • the valid duration may be set to zero.
  • the network device 220-1 may decrease the number of terminal devices based on the information.
  • the terminal device may transmit 3030 the information to the network device 220-2 which serves the target cell after switching to the target cell.
  • the network device 220-2 may obtain the cell identity of the source cell based on the information which may comprise the identity of the last reported cell.
  • the network device 220-2 may transmit 3035 at least part of the information to the network device 220-1.
  • the network device 220-2 may transmit the identity of the terminal device 210-1 which is included in the information.
  • some parameters for example, broadcast frequency list, broadcast service priority, broadcast information and downlink bandwidth part
  • the network device 220-1 may transmit 3040 a transmission configuration to the terminal device 210-1.
  • the network device 220-1 may periodically transmit the transmission configuration.
  • the transmission configuration may be sent on a single cell multicast control channel (SC-MCCH) .
  • SC-MCCH single cell multicast control channel
  • the transmission configuration may comprise a valid duration for the counting to indicate the counting validity.
  • the valid duration may be 0, 5minutes, 10miniuts, 2hours or any suitable duration. If the valid duration is set to 0, it means that the counting will not be expired.
  • the transmission configuration may comprise an indication whether counting the number of terminal devices associated with the broadcast service is required.
  • the transmission configuration may comprise a temporary mobile group identity to indicate the broadcast service.
  • the terminal device 210-1 may transmit the information to the network device 220-1 after the valid duration expires.
  • Fig. 4 shows a flowchart of an example method 700 implemented at a terminal device 210 in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 400 will be described from the perspective of the terminal device 210-1.
  • the terminal device 220-1 generates information of a broadcast service associated with the terminal device 210-1.
  • the terminal device 210-1 may be in RRC_INACTIVE state.
  • the information may comprise an identity of the terminal device.
  • the information may also comprise a downlink bandwidth part associated with the broadcast service.
  • the information may comprise an identity of the broadcast service.
  • the identity can be extended due to diversity of services. For example, the identity can be extended to 4, 5, 6, 7, 8, or any suitable integer. If the identity is extended to 8, it means that the number of services can be 2 8 .
  • the information may comprise an indication to indicate whether the terminal device 210-1 is interested in the broadcast service. In other words, it indicates whether the terminal device 210-1 interests in the broadcast service.
  • the indication may be representing as counting cause in the information. If the terminal device 210-1 needs (interests in) the broadcast service, the number of terminal devices associated with the broadcast service may be increased. Alternatively, if the terminal device 210-1 does not interest in the broadcast service, the number of terminal devices associated with the broadcast service may be decreased. In this way, the network device 210-1 is able to count the number of terminal network devices which interest in the broadcast services.
  • the network device 210- may switch from point-to-point transmission to point-to-multi points transmission based on the number, thereby saving signaling.
  • the information may comprise a valid duration of the information.
  • the valid duration may be set to 0, which means that the network device 220-2 may discount the broadcast service interests of the terminal device 210-1. For example, if the valid duration is set to 60 minutes and the information indicates that the terminal device 210-1 interests the broadcast service, it means that the terminal device 210-1 is interested in the broadcast service for 60 minutes. It should be notes that the valid duration can be any suitable durations.
  • an identity of a last reported cell may be included in the information.
  • the information may comprise a physical cell ID of the last reported cell.
  • the terminal device 210-1 may be RRC_IDLE state.
  • the information may comprise a radio network temporary identity (RNTI) .
  • the information may also comprise a downlink bandwidth part associated with the broadcast service.
  • RNTI radio network temporary identity
  • the information may comprise an identity of the broadcast service.
  • the identity can be extended due to diversity of services. For example, the identity can be extended to 4, 5, 6, 7, 8, or any suitable integer. If the identity is extended to 8, it means that the number of services can be 2 8 .
  • the information may comprise an indication to indicate whether the terminal device 210-1 is interested in the broadcast service. In other words, it indicates whether the terminal device 210-1 interests in the broadcast service.
  • the indication may be represented as counting cause in the information.
  • the counting cause may represent MBMS counting which means the terminal device 210-1 is interested in this broadcast service.
  • the counting cause may represent MBMS Discount which means the terminal device 210-1 is no longer interested in the broadcast service. If the terminal device 210-1 needs (interests in) the broadcast service, the number of terminal devices associated with the broadcast service may be increased. Alternatively, if the terminal device 210-1 does not interest in the broadcast service, the number of terminal devices associated with the broadcast service may be decreased. In this way, the network device 210-1 is able to count the number of terminal network devices which interest in the broadcast services.
  • the network device 210- may switch from point-to-point transmission to point-to-multi points transmission based on the number, thereby saving signaling.
  • the information may comprise a valid duration of the information.
  • the valid duration may be set to 0, which means that the network device 220-2 may discount the broadcast service interests of the terminal device 210-1. For example, if the valid duration is set to 30 minutes and the information indicates that the terminal device 210-1 does not interest in the broadcast service, it means that the terminal device 210-1 does not the broadcast service during 30 minutes. It should be notes that the valid duration can be any suitable durations.
  • an identity of a last reported cell may be included in the information.
  • the information may comprise a physical cell ID of the last reported cell.
  • the terminal device 210-1 transmits the information to the network device 210-1 during a random access procedure with the network device 210-1.
  • the information may be transmitted in Msg 3.
  • the terminal device 210-1 may transmit the information in Msg A.
  • the terminal device 210-1 may receive further information which indicates the identity of the terminal device 210-1 during the random access procedure.
  • the identity of the terminal device 210-1 may be transmitted in Msg 4.
  • the identity of the terminal device may be transmitted in Msg B.
  • the Msg B may be received without the identity of the terminal device 210-1.
  • the terminal device 210-1 may determine to switch from a source cell to a target cell.
  • the target cell may be selected from neighbor cells based on signal quality and/or signal power.
  • the counting information of the source cell may be updated.
  • the terminal device 210-1 may transmit the information to the network device 210-which serves the source cell before switching to the target cell before performing the cell switch to the target cell.
  • the indication in the information may indicate that the terminal device 210-1 is not interested in the broadcast service.
  • the valid duration may be set to zero.
  • the network device 220-1 may decrease the number of terminal devices based on the information.
  • the terminal device may transmit the information to the network device 220-2 which serves the target cell after switching to the target cell.
  • the network device 220-2 may obtain the cell identity of the source cell based on the information which may comprise the identity of the last reported cell.
  • the terminal device 210-1 may receive a transmission configuration from the network device 220-1.
  • the transmission configuration may be periodically transmitted.
  • the transmission configuration may be sent on a SC-MCCH.
  • the transmission configuration may comprise a valid duration for the counting to indicate the counting validity.
  • the valid duration may be 0, 5minutes, 10miniuts, 2hours or any suitable duration. If the valid duration is set to 0, it means that the counting will not be expired.
  • the transmission configuration may comprise an indication whether counting the number of terminal devices associated with the broadcast service is required.
  • the transmission configuration may comprise a temporary mobile group identity to indicate the broadcast service.
  • the terminal device 210-1 may transmit the information to the network device 220-1 after the valid duration expires.
  • Fig. 5 shows a flowchart of an example method 500 implemented at a network device 220 in accordance with some example embodiments of the present disclosure.
  • the method 800 will be described from the perspective of the network device 220-1.
  • the network device 220-1 receives information of a broadcast service associated with the terminal device 210-1 from the terminal device 210-1, during a random access procedure with the terminal device 210-1.
  • the information may be received in Msg 3.
  • the network device 220-1 may receive the information in Msg A.
  • the terminal device 210-1 may be in RRC_INACTIVE state.
  • the information may comprise an identity of the terminal device.
  • the information may also comprise a downlink bandwidth part associated with the broadcast service.
  • the information may comprise an identity of the broadcast service.
  • the identity can be extended due to diversity of services. For example, the identity can be extended to 4, 5, 6, 7, 8, or any suitable integer. If the identity is extended to 8, it means that the number of services can be 2 8 .
  • the information may comprise an indication to indicate whether the terminal device 210-1 is interested in the broadcast service. In other words, it indicates whether the terminal device 210-1 interests in the broadcast service.
  • the indication may be represented as counting cause in the information. If the terminal device 210-1 needs (interests in) the broadcast service, the number of terminal devices associated with the broadcast service may be increased. Alternatively, if the terminal device 210-1 does not interest in the broadcast service, the number of terminal devices associated with the broadcast service may be decreased. In this way, the network device 210-1 is able to count the number of terminal network devices which interest in the broadcast services.
  • the network device 210- may switch from point-to-point transmission to point-to-multi points transmission based on the number, thereby saving signaling.
  • the information may comprise a valid duration of the information.
  • the valid duration may be set to 0, which means that the network device 220-2 may discount the broadcast service interests of the terminal device 210-1. For example, if the valid duration is set to 60 minutes and the information indicates that the terminal device 210-1 interests the broadcast service, it means that the terminal device 210-1 is interested in the broadcast service for 60 minutes. It should be notes that the valid duration can be any suitable durations.
  • an identity of a last reported cell may be included in the information.
  • the information may comprise a physical cell ID of the last reported cell.
  • the terminal device 210-1 may be RRC_IDLE state.
  • the information may comprise a radio network temporary identity (RNTI) .
  • the information may also comprise a downlink bandwidth part associated with the broadcast service.
  • RNTI radio network temporary identity
  • the information may comprise an identity of the broadcast service.
  • the identity can be extended due to diversity of services. For example, the identity can be extended to 4, 5, 6, 7, 8, or any suitable integer. If the identity is extended to 8, it means that the number of services can be 2 8 .
  • the information may comprise an indication to indicate whether the terminal device 210-1 is interested in the broadcast service. In other words, it indicates whether the terminal device 210-1 interests in the broadcast service.
  • the indication may be represented as counting cause in the information.
  • the counting cause may represent MBMS counting which means the terminal device 210-1 is interested in this broadcast service.
  • the counting cause may represent MBMS Discount which means the terminal device 210-1 is no longer interested in the broadcast service. If the terminal device 210-1 needs (interests in) the broadcast service, the number of terminal devices associated with the broadcast service may be increased. Alternatively, if the terminal device 210-1 does not interest in the broadcast service, the number of terminal devices associated with the broadcast service may be decreased. In this way, the network device 210-1 is able to count the number of terminal network devices which interest in the broadcast services.
  • the network device 210- may switch from point-to-point transmission to point-to-multi points transmission based on the number, thereby saving signaling.
  • the information may comprise a valid duration of the information.
  • the valid duration may be set to 0, which means that the network device 220-2 may discount the broadcast service interests of the terminal device 210-1. For example, if the valid duration is set to 30 minutes and the information indicates that the terminal device 210-1 does not interest in the broadcast service, it means that the terminal device 210-1 does not the broadcast service during 30 minutes. It should be notes that the valid duration can be any suitable durations.
  • an identity of a last reported cell may be included in the information.
  • the information may comprise a physical cell ID of the last reported cell.
  • the network device 220-1 determines the number of terminal devices 210 associated with the broadcast service based on the information. For example, if the information indicates that the terminal device 210-1 is interested in the broadcast service, the network device 220-1 may update the number of terminal devices by one. Alternatively, if the information indicates that the terminal device 210-1 is not interested in the broadcast service, the number of terminal devices may be decreased. In this way, the network device 210-1 is able to count the number of terminal network devices which interest in the broadcast services. The network device 210-may determine that point-to-multi points transmission is needed, thereby saving signaling.
  • the network device 220-1 may transmit further information which indicates the identity of the terminal device 210-1 during the random access procedure.
  • the network device 220-2 may transmit the identity of the terminal device 210-1 to finalize the contention resolution. For example, the network device 220-1 may obtain the identity of the terminal device 210-1.
  • the network device 220-1 may transmit the identity of the terminal device 210-1 in Msg 4. In other embodiments, the identity of the terminal device may be transmitted in Msg B. In a yet embodiment, the network device 220-1 may transmit Msg B to the terminal device 210-1 without the identity of the terminal device 210-1.
  • the network may only count the number of terminal devices which are interested in the broadcast service, the identity of the terminal device is unnecessary to be identified by the network, in resulting the contention resolution can be ignored. So the network device 220-1 may not send the further information to the terminal device 210-1.
  • the network device 220-1 may obtain the cell identity of the source cell based on the information which may comprise the identity of the last reported cell.
  • the network device 220-1 may transmit at least part of the information to the network device which serves the source cell. For example, the identity of the terminal device 210-1 which is included in the information may be transmitted. In some embodiments, some parameters (for example, broadcast frequency list, broadcast service priority, broadcast information and downlink bandwidth part) may not be transmitted to the network device serves the source cell.
  • the network device 220-1 may transmit a transmission configuration to the terminal device 210-1. In some embodiments, the network device 220-1 may periodically transmit the transmission configuration. The transmission configuration may be sent on a SC-MCCH.
  • the transmission configuration may comprise a valid duration for the counting to indicate the counting validity.
  • the valid duration may be 0, 5minutes, 10miniuts, 2hours or any suitable duration. If the valid duration is set to 0, it means that the counting will not be expired.
  • the transmission configuration may comprise an indication whether counting the number of terminal devices associated with the broadcast service is required.
  • the transmission configuration may comprise a temporary mobile group identity to indicate the broadcast service.
  • Fig. 6 is a simplified block diagram of a device 600 that is suitable for implementing embodiments of the present disclosure.
  • the device 600 can be considered as a further example implementation of the terminal device 110 and the network device 120 as shown in Fig. 1. Accordingly, the device 600 can be implemented at or as at least a part of the terminal device 110 or the network device 120.
  • the device 600 includes a processor 610, a memory 620 coupled to the processor 610, a suitable transmitter (TX) and receiver (RX) 640 coupled to the processor 610, and a communication interface coupled to the TX/RX 640.
  • the memory 620 stores at least a part of a program 630.
  • the TX/RX 640 is for bidirectional communications.
  • the TX/RX 640 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between eNBs, S1 interface for communication between a Mobility Management Entity (MME) /Serving Gateway (S-GW) and the eNB, Un interface for communication between the eNB and a relay node (RN) , or Uu interface for communication between the eNB and a terminal device.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Un interface for communication between the eNB and a relay node (RN)
  • Uu interface for communication between the eNB and a terminal device.
  • the program 630 is assumed to include program instructions that, when executed by the associated processor 610, enable the device 600 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to Fig. 3 to 5.
  • the embodiments herein may be implemented by computer software executable by the processor 610 of the device 600, or by hardware, or by a combination of software and hardware.
  • the processor 610 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 610 and memory 620 may form processing means 650 adapted to implement various embodiments of the present disclosure.
  • the memory 620 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 620 is shown in the device 600, there may be several physically distinct memory modules in the device 600.
  • the processor 610 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 600 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.
  • 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 representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods 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 process or method as described above with reference to any of Figs. 3-5.
  • 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 above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine 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.
  • machine readable storage medium More specific examples of the machine 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.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.

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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 donnés à titre d'exemple de la présente divulgation se rapportent à la communication. Selon des modes de réalisation de la présente divulgation, un dispositif terminal transmet des informations d'un service de diffusion associé au dispositif terminal à un dispositif de réseau pendant une procédure d'accès aléatoire. Le dispositif de réseau détermine le nombre de dispositifs terminaux associés au service de diffusion. De cette manière, la signalisation est économisée et les performances de communication sont améliorées.
PCT/CN2020/097773 2020-06-23 2020-06-23 Procédés, dispositifs et support lisible par ordinateur de communication WO2021258298A1 (fr)

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