WO2021259129A1 - 一种通信方法及通信装置 - Google Patents

一种通信方法及通信装置 Download PDF

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Publication number
WO2021259129A1
WO2021259129A1 PCT/CN2021/100600 CN2021100600W WO2021259129A1 WO 2021259129 A1 WO2021259129 A1 WO 2021259129A1 CN 2021100600 W CN2021100600 W CN 2021100600W WO 2021259129 A1 WO2021259129 A1 WO 2021259129A1
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Prior art keywords
configuration
random access
terminal device
cell
mbs service
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PCT/CN2021/100600
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English (en)
French (fr)
Inventor
辛婷玉
李秉肇
陈磊
于海凤
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华为技术有限公司
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Publication of WO2021259129A1 publication Critical patent/WO2021259129A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method and communication device.
  • MBS broadcast multicast service (multicast broadcast service, MBS) is a service oriented to multiple terminal devices, such as live broadcast and scheduled broadcast of programs.
  • Multicast transmission technology refers to a technology in which MBS services are simultaneously sent to multiple terminal devices through a base station.
  • the terminal device receiving the MBS service usually first receives the multicast configuration information, and receives the data of the MBS service according to the configuration information.
  • the transmission of the configuration information of the MBS service generally has a long fixed period, which causes data transmission delay and reduces the communication quality.
  • the embodiments of the present application provide a communication method and communication device, which are used to reduce the time delay of MBS service transmission and improve the transmission flexibility of MBS service.
  • a first aspect provides a communication method, including: sending a random access message, where the random access message includes first indication information, the first indication information is used to request a first configuration of a broadcast-multicast MBS service, and to receive the first configuration.
  • the cell where the terminal device is located plays one or more MBS services.
  • the terminal device When the terminal device is interested in the one or more MBS services, the terminal device sends a random access message to the network device by initiating random access.
  • the random access message includes first indication information, which is used to request the first configuration from the network device.
  • the first configuration is a configuration of one or more MBS services that the terminal device is interested in.
  • the first configuration may include: configuration information about the multicast broadcast control channel carried in the system information, or control and configuration information about the broadcast multicast data channel carried on the multicast broadcast control channel.
  • the first configuration may also be the on demand SI obtained according to the system information, or the configuration of the MBS service carried on the on demand SI.
  • the terminal device when the terminal device needs to receive the MBS service, it actively sends a random access message to the network device, and requests the configuration of the MBS service from the network device through the random access message, thereby completing the reception of the MBS service. Therefore, the time delay for the terminal device to acquire the configuration of the MBS service is short and the acquisition is flexible.
  • the terminal device can send the random access message through the random access process.
  • the random access process may be a four-step random access process, and the random access message including the first indication information sent by the terminal device is the random access message 3 in the four-step random access process.
  • the random access process may be a two-step random access process, and the random access message including the first indication information sent by the terminal device is the random access message A in the two-step random access process.
  • the terminal device actively requests the first configuration of the MBS service from the network device through the random access message 3 or the random access message A, without passively waiting for reception, thereby reducing the transmission delay of the MBS service.
  • the terminal device receives the broadcast multicast MBS service in the first cell, and at the same time, the terminal device moves from the first cell to the second cell due to mobility requirements.
  • the terminal device receives the second configuration of the broadcast-multicast MBS service in the first cell, and enters the second cell through cell reselection.
  • the second cell is playing or will play the MBS service that the terminal device is receiving in the first cell, and the terminal device sends a random access message in the second cell after entering the second cell.
  • the terminal device receives the configuration of MBS in the first cell, and after the terminal device moves to the second cell, the terminal device actively initiates a random access procedure to request the configuration of the MBS service from the second cell. Therefore, there is no need to wait for the sending timing of the configuration of the MBS service in the second cell, reducing the time delay of receiving the MBS service due to the movement of the terminal equipment, and enhancing the continuity of the MBS service.
  • the second configuration for the terminal device to receive the broadcast-multicast MBS service in the first cell may also include second indication information.
  • the second indication information is used to indicate that the broadcast-multicast MBS service is configured with service continuity, and the terminal device sends according to the service continuity. Random access message.
  • Configured with business continuity means that the MBS service has a requirement to ensure business continuity.
  • the requirement of business continuity can specifically refer to the requirement for service interruption time or whether interruption is allowed, the requirement for enhanced service continuity, and so on.
  • the terminal device can receive the MBS service and its configuration information in a more flexible manner according to the indication of the second indication information after moving to the second cell.
  • the terminal device in the second cell only needs to request the configuration of the MBS service that needs to ensure service continuity from the network device, and the terminal device does not need to request the configuration of other MBS services in the second cell.
  • the second indication information may be a display indication or an implicit indication.
  • IE or fields can be added to the second configuration.
  • the second configuration of the MBS service received by the terminal device may include the identification information of the broadcast-multicast MBS service.
  • the identification information of the broadcast-multicast MBS service is used to identify each MBS service.
  • the terminal device receives one or more MBS services with identifiers in the first cell, and identifies each MBS service through the identifier information.
  • the second configuration may include service priority information, that is, the priority corresponding to each broadcast-multicast MBS service.
  • the terminal device may determine whether to request configuration information of the broadcast multicast MBS service from the network device according to the priority information, and the network device may also determine whether to send the broadcast multicast MBS service configuration information to the terminal device according to the priority information. Configuration information.
  • the terminal device camps in the second cell, first receives system information of the second cell, and determines whether to send a random access message according to the system information.
  • the system information carries the configuration modification period, repetition period, and radio frame offset of the MBS service.
  • the terminal device can learn the time when the second cell sends the next MBS service configuration, so that the terminal device decides whether to send a random access message to the second cell to request the MBS configuration.
  • the process for the terminal device to determine whether to send a random access message according to the system information may include: the second cell sends the third configuration of the broadcast multicast MBS service, determines the time to receive the third configuration according to the system information, and confirms the reception of the third configuration. When the time is later than or equal to the time when the first configuration is received, the random access message is sent.
  • the configuration that the network device transmits according to the transmission period inherent to the MBS service in the second cell is referred to as the third configuration of the MBS service.
  • the content of the third configuration and the first configuration may be the same, or the content of the third configuration includes the content of the first configuration.
  • the terminal device can obtain the configuration of the MBS service in a shorter time, thereby improving the continuity of receiving the MBS service of the terminal device during the movement between cells and improving communication quality.
  • the terminal device sending the random access message is in the RRC idle state or the RRC inactive state.
  • a second aspect provides a communication method, including: receiving a random access message, where the random access message includes first indication information, and sending a first configuration in response to the first indication information, the first configuration being a configuration of a broadcast-multicast MBS service.
  • the network device plays one or more MBS services to the cell where the terminal device is located, and the terminal device sends a random access message to the network device by initiating random access.
  • the random access message includes first indication information, which is used to request the first configuration from the network device.
  • the first configuration is the configuration of one or more MBS services that the terminal device is interested in.
  • the network device sends the first configuration to the terminal device in response to the first indication information, and the terminal device obtains the MBS service according to the first configuration.
  • the network device sends the configuration of the MBS service to the terminal device based on the request sent by the terminal device, instead of sending the configuration of the MBS service according to a preset sending cycle. Therefore, the network equipment sending MBS service has the characteristics of short delay and flexible sending.
  • the random access message sent by the terminal device can be implemented through a random access process.
  • the network device sending the first configuration can be implemented through a random access process.
  • the random access process can be a four-step random access process, and the random access message including the first indication information sent by the terminal device is a random access message 3 in the four-step random access process, and the network device uses the random access message 4 Send the first configuration.
  • the random access process may be a two-step random access process, and the random access message including the first indication information sent by the terminal device is the random access message A in the two-step random access process, and the network device uses random access Incoming message B sends the first configuration.
  • the network device sends the third configuration of the broadcast-multicast MBS service to the terminal device, and the network device sends system information, and the system information includes the sending period and offset of the third configuration.
  • the third configuration refers to the configuration that the network device sends according to the inherent sending cycle of the MBS service.
  • the network device sends system information before sending the third configuration.
  • the system information includes the configured sending period and offset of the broadcast-multicast MBS service being or about to be sent by the network device. According to the sending period and offset of the configuration of the MBS service, the time for the network device to send the third configuration can be determined.
  • the third configuration is sent by the network device according to a predetermined period of the protocol, and the first configuration is sent by the network device according to the request of the terminal device.
  • the sending period and offset of the MBS service configuration included in the system information sent by the network device can enable the terminal device to know the time when the network device sends the third configuration, thereby helping the terminal device to determine whether to send the first indication information to the network device .
  • a third aspect provides a communication method, including: a terminal device receives a second configuration of a broadcast-multicast MBS service, and the terminal device obtains data of the broadcast-multicast MBS service according to the second configuration.
  • the second configuration includes second indication information, and the second indication information is used to indicate that the broadcast-multicast MBS service is configured with service continuity.
  • the second indication information for service continuity indication is for each broadcast-multicast MBS service.
  • the second indication information indicates that the broadcast-multicast MBS service is configured with service continuity, which means that the terminal device moves between cells and enters a new cell. In the cell, it is necessary to adopt a business continuity guarantee mechanism for the MBS service.
  • the second configuration may include: configuration information about the multicast broadcast control channel carried in the system information, and control and configuration information about the broadcast multicast data channel carried on the multicast broadcast control channel.
  • the second configuration may also be the on demand SI obtained according to the system information, or the configuration of the MBS service carried on the on demand SI.
  • the second configuration further includes a first criterion for triggering random access, and the terminal device determines whether the first criterion is satisfied. When the first criterion is met, the terminal device initiates random access to the network device and enters the RRC connected state.
  • the second indication information is used to indicate whether the broadcast-multicast MBS service is configured with service continuity.
  • the terminal device receives the MBS service configured with service continuity, and needs to adopt a service continuity guarantee mechanism. If the MBS service received by the terminal device is not configured with service continuity, it does not need to adopt a service continuity guarantee mechanism, thereby saving resources while guaranteeing service continuity.
  • the second indication information may be a display indication or an implicit indication.
  • IE or fields can be added to the second configuration.
  • the implicit indication can be indicated by mapping the MBS service to a radio bearer (radio bearer, RB), etc.
  • the first criterion may be: the terminal device measures the channel quality or signal quality in the first cell, and when it is determined that the measurement result reaches the threshold, the terminal device initiates random access.
  • the first criterion may be: the signal quality or channel quality reaches the threshold multiple times within the first time period, and the terminal device triggers random access.
  • the first criterion may be: the terminal device triggers random access after the second time period after the signal quality or channel quality measurement result reaches the threshold.
  • the second configuration may include service priority information, that is, the priority corresponding to each broadcast-multicast MBS service.
  • the terminal device may determine whether to request configuration information of the broadcast multicast MBS service from the network device according to the priority information, and the network device may also determine whether to send the broadcast multicast MBS service configuration information to the terminal device according to the priority information. Configuration information.
  • the terminal device receives the second configuration in the first cell, completes random access in the first cell, switches from the first cell to the second cell, and receives the second configuration in the second cell.
  • the first configuration of the broadcast-multicast MBS service is the configuration of the MBS service of the second cell received by the terminal device
  • the second configuration is the configuration of the MBS service of the first cell received by the terminal device.
  • the first configuration and the second configuration are configurations of the same MBS service.
  • the first configuration and the second configuration can be the same or different.
  • the terminal device enters the RRC connected state in the first cell, and subsequent actions are scheduled by the network device.
  • the network equipment allows the terminal equipment to enter the second cell from the first cell through cell handover (HO), and continues to receive the first configuration of the broadcast-multicast MBS service in the second cell, so it can ensure that the broadcast-multicast MBS service is received Continuity.
  • the terminal device may determine whether the second criterion is satisfied. When the second criterion is met, the terminal device can return to the RRC idle state or the RRC inactive state.
  • the second criterion may be that the network device is configured for the terminal device.
  • the second criterion may be included in a random access response message, RRC connection reconfiguration (RRC reconfiguration) or other messages.
  • the second configuration of the MBS service received by the terminal device may include the identification information of the broadcast-multicast MBS service.
  • the identification information of the broadcast-multicast MBS service is used to identify each MBS service.
  • the terminal device receives one or more MBS services with identifiers in the first cell, and identifies each MBS service through the identifier information.
  • first information may be sent to the network device, where the first information is used to indicate a reason for initiating random access. After the network device receives the first information, it will be able to learn that the reason why the terminal device initiates random access at this time is to maintain the continuity of the broadcast-multicast MBS service.
  • a fourth aspect provides a communication method, including: generating a second configuration of a broadcast-multicast MBS service, and sending a second configuration of the broadcast-multicast MBS service, the second configuration including second indication information, and the second indication information is used for Indicate that the broadcast-multicast MBS service is configured with service continuity.
  • the second indication information for service continuity indication is for each broadcast-multicast MBS service.
  • the second indication information indicates that the broadcast-multicast MBS service is configured with service continuity, which means that the terminal device moves between cells and enters a new cell. In the cell, it is necessary to adopt a business continuity guarantee mechanism for the MBS service.
  • the second configuration may include: configuration information about the multicast broadcast control channel carried in the system information, and control and configuration information about the broadcast multicast data channel carried on the multicast broadcast control channel.
  • the second configuration may also be the on demand SI obtained according to the system information, or the configuration of the MBS service carried on the on demand SI.
  • the second configuration further includes a first criterion for triggering random access, and the first criterion is used for triggering random access by the terminal device.
  • the first criterion may be: the terminal device measures the channel quality or signal quality in the first cell, and when it is determined that the measurement result reaches the threshold, the terminal device initiates random access.
  • the first criterion may be: the signal quality or channel quality reaches the threshold multiple times within the first time period, and the terminal device triggers random access.
  • the first criterion may be: the terminal device triggers random access after the second time period after the signal quality or channel quality measurement result reaches the threshold.
  • the second indication information is used to indicate whether the broadcast-multicast MBS service is configured with service continuity.
  • the terminal device receives the MBS service configured with service continuity, and needs to adopt a service continuity guarantee mechanism. If the MBS service received by the terminal device is not configured with service continuity, it does not need to adopt a service continuity guarantee mechanism, thereby saving resources while guaranteeing service continuity.
  • the second configuration may include service priority information, that is, the priority corresponding to each broadcast-multicast MBS service.
  • the terminal device may determine whether to request configuration information of the broadcast multicast MBS service from the network device according to the priority information, and the network device may also determine whether to send the broadcast multicast MBS service configuration information to the terminal device according to the priority information. Configuration information.
  • the first cell sends the second configuration of the broadcast-multicast MBS service. After the terminal device completes random access, the terminal device switches from the first cell to the second cell.
  • the first cell receives handover confirmation information, and the handover confirmation information includes information about the MBS service in the second cell.
  • the information of the MBS service in the second cell may include: the MBS service supported by the second cell, the progress information of the MBS service, and the configuration information of the MBS service.
  • the first cell can determine the handover cell as the second cell for the terminal device according to the handover confirmation information, and can send the configuration information of the MBS service of the second cell to the terminal device and instruct the terminal device to switch.
  • the network device receives first information, and the first information is used to indicate a reason for initiating random access. Based on the first information received, the network device will be able to learn that the reason why the terminal device initiates random access at this time is to maintain the continuity of the broadcast-multicast MBS service.
  • a fifth aspect provides a communication device, which may be a terminal device. It includes: a sending module, configured to send a random access message, the random access message including first indication information, and the first indication information is used to request a first configuration of a broadcast-multicast MBS service; a receiving module, configured to receive The first configuration.
  • the cell where the terminal device is located plays one or more MBS services.
  • the terminal device When the terminal device is interested in the one or more MBS services, the terminal device sends a random access message to the network device by initiating random access.
  • the random access message includes first indication information for requesting a first configuration from the network device, and the first configuration is the configuration of one or more MBS services that the terminal device is interested in.
  • the first configuration may include: configuration information about the multicast broadcast control channel carried in the system information, and control and configuration information about the broadcast multicast data channel carried on the multicast broadcast control channel.
  • the first configuration may also be the configuration of the on demand SI obtained according to the system information, and the configuration of the MBS service carried on the on demand SI.
  • the terminal device when the terminal device needs to receive the MBS service, it actively sends a random access message to the network device, and requests the configuration of the MBS service from the network device through the random access message, thereby completing the reception of the MBS service. It has the characteristics of short time delay and flexible MBS service acquisition.
  • the random access message sent by the terminal device can be achieved through a random access process, the random access process can be a four-step random access process, and the random access message sent by the terminal device including the first indication information is a four-step random access process Random access message in 3.
  • the random access process may be a two-step random access process, and the random access message including the first indication information sent by the terminal device is the random access message A in the two-step random access process.
  • the terminal device actively requests the first configuration of the MBS service from the network device through the random access message 3 or the random access message A, without passively waiting for reception, thereby reducing the transmission delay of the MBS service.
  • the terminal device receives the broadcast multicast MBS service of the first cell, and at the same time, the terminal device moves from the first cell to the second cell due to mobility requirements.
  • the receiving module of the terminal equipment is used for receiving the second configuration of the broadcast multicast MBS service in the first cell, and the processing module is used for selecting the second cell as the camping cell of the communication device.
  • the second cell is playing or will play the MBS service that the terminal device is receiving in the first cell, and the terminal device sends a random access message in the second cell after entering the second cell.
  • the terminal device receives the MBS configuration of the first cell. After the terminal device moves to the second cell, the terminal device actively initiates a random access procedure to request the configuration of the MBS service from the second cell. Therefore, there is no need to wait for the sending timing of the configuration of the MBS service of the multicast service in the second cell, which reduces the delay of receiving the MBS service due to the movement of the terminal equipment and enhances the continuity of the MBS service.
  • the second configuration for the terminal device to receive the broadcast-multicast MBS service in the first cell may also include second indication information.
  • the second indication information is used to indicate that the broadcast-multicast MBS service is configured with service continuity, and the terminal device sends according to the service continuity.
  • Random access message Configured with business continuity means that the MBS service has the requirement to ensure business continuity.
  • the requirement of business continuity can specifically refer to the requirements for business interruption time or whether interruption is allowed, the requirements for enhanced business continuity, etc., according to business continuity Send a random access message.
  • the terminal device can receive the MBS service and its configuration information in a more flexible manner according to the indication of the second indication information.
  • the terminal device in the second cell only needs to request the configuration of the MBS service that needs to ensure service continuity from the network device, and the configuration of other MBS services in the second cell does not need to be requested.
  • the second indication information may be a display indication or an implicit indication.
  • IE or fields can be added to the second configuration.
  • the second configuration of the MBS service received by the terminal device may also include the identification information of the broadcast-multicast MBS service.
  • the identification information of the broadcast-multicast MBS service is used to identify each MBS service, and the terminal device receives one or more identified MBS services in the first cell. Identify each MBS service through identification information.
  • the second configuration may include service priority information, that is, the priority corresponding to each broadcast-multicast MBS service.
  • the terminal device may determine whether to request configuration information of the broadcast multicast MBS service from the network device according to the priority information, and the network device may also determine whether to send the broadcast multicast MBS service configuration information to the terminal device according to the priority information. Configuration information.
  • the terminal device camps in the second cell, first receives system information of the second cell, and determines whether to send a random access message according to the system information.
  • the system information carries the configuration modification period, repetition period, and radio frame offset of the MBS service.
  • the terminal device can learn the time when the second cell sends the next MBS service configuration, so that the terminal device decides whether to send a random access message to the second cell to request the MBS configuration.
  • the process for the terminal device to determine whether to send the random access message according to the system information may be: the second cell sends the third configuration of the broadcast multicast MBS service, determines the time to receive the third configuration according to the system information, and confirms the reception of the third configuration When the time is later than or equal to the time when the first configuration is received, the random access message is sent.
  • the configuration that the network device transmits according to the transmission period inherent to the MBS service in the second cell is referred to as the third configuration of the MBS service.
  • the content of the third configuration and the first configuration may be the same, or the content of the third configuration includes the content of the first configuration.
  • the terminal device can obtain the configuration of the MBS service in a shorter time, thereby improving the continuity of receiving the MBS service of the terminal device during the movement between cells and improving communication quality.
  • the terminal device is in the RRC idle state or the RRC inactive state.
  • a sixth aspect provides a communication device, which may be a network device, and includes: a receiving module configured to receive a random access message, the random access message including first indication information; a sending module, In response to sending the first configuration in response to the first indication information, the first configuration is a configuration of a broadcast-multicast MBS service.
  • the network device plays one or more MBS services to the cell where the terminal device is located, and the terminal device sends a random access message to the network device by initiating random access.
  • the random access message includes first indication information for requesting a first configuration from the network device, and the first configuration is the configuration of one or more MBS services that the terminal device is interested in.
  • the network device sends the first configuration to the terminal device in response to the first indication information, and the terminal device obtains the MBS service according to the first configuration.
  • the network device sends the configuration of the MBS service to the terminal device based on the request sent by the terminal device, instead of sending the configuration of the MBS service according to a preset sending cycle. Therefore, the network equipment sending MBS service has the characteristics of short delay and flexible sending.
  • the terminal device sending the random access message can be implemented through a random access process, and similarly, the network device sending the first configuration can be implemented through a random access process.
  • the random access process can be a four-step random access process, and the random access message including the first indication information sent by the terminal device is a random access message 3 in the four-step random access process, and the network device uses the random access message 4 Send the first configuration.
  • the random access process may be a two-step random access process, and the random access message including the first indication information sent by the terminal device is the random access message A in the two-step random access process, and the random access message B sends the first configuration.
  • the network device sends the third configuration of the broadcast-multicast MBS service to the terminal device, and the network device sends system information, and the system information includes the sending period and offset of the third configuration.
  • the third configuration refers to the configuration that the network device sends according to the inherent sending cycle of the MBS service.
  • the network device Before sending the third configuration, the network device first sends system information, and the system information includes the sending period and offset of the configuration of the broadcast-multicast MBS service that the network device is or is about to send. According to the sending period and offset of the configuration of the MBS service, the time for the network device to send the third configuration can be determined.
  • the third configuration is sent by the network device according to a predetermined period of the protocol, and the first configuration is sent by the network device according to the request of the terminal device.
  • the sending period and offset of the MBS service configuration included in the system information sent by the network device can enable the terminal device to know the time when the network device sends the third configuration, thereby helping the terminal device to determine whether to send the first indication information to the network device .
  • a seventh aspect provides a communication device.
  • the communication device may be a terminal device.
  • the communication device includes a receiving module configured to receive a second configuration of a broadcast-multicast MBS service, and the receiving module obtains data of the broadcast-multicast MBS service according to the second configuration.
  • the second configuration includes second indication information, and the second indication information is used to indicate that the broadcast-multicast MBS service is configured with service continuity.
  • the second indication information for service continuity indication is for each broadcast-multicast MBS service.
  • the second indication information indicates that the broadcast-multicast MBS service is configured with service continuity, which means that the terminal device moves between cells and enters a new cell. In the cell, it is necessary to adopt a business continuity guarantee mechanism for the MBS service.
  • the second configuration may include: configuration information about the multicast broadcast control channel carried in the system information, and control and configuration information about the broadcast multicast data channel carried on the multicast broadcast control channel.
  • the second configuration may also be the on demand SI obtained according to the system information, or the configuration of the MBS service carried on the on demand SI.
  • the second configuration further includes a first criterion for triggering random access, and the terminal device determines whether the first criterion is satisfied. When the first criterion is met, the terminal device initiates random access to the network device and enters the RRC connected state.
  • the second indication information is used to indicate whether the broadcast-multicast MBS service is configured with service continuity.
  • the terminal device receives the MBS service configured with service continuity, and needs to adopt a service continuity guarantee mechanism. If the MBS service received by the terminal device is not configured with service continuity, it does not need to adopt a service continuity guarantee mechanism, thereby saving resources while guaranteeing service continuity.
  • the second indication information may be a display indication or an implicit indication.
  • IE or fields can be added to the second configuration.
  • the implicit indication can be indicated by mapping the MBS service to a specific radio bearer (radio bearer, RB), etc.
  • the first criterion may be: the terminal device measures the channel quality or signal quality in the first cell, and when it is determined that the measurement result reaches the threshold, the terminal device initiates random access.
  • the first criterion may be: the signal quality or channel quality reaches the threshold multiple times within the first time period, and the terminal device triggers random access.
  • the first criterion may be: the terminal device triggers random access after the second time period after the signal quality or channel quality measurement result reaches the threshold.
  • the second configuration may include service priority information, that is, the priority corresponding to each broadcast-multicast MBS service.
  • the terminal device may determine whether to request configuration information of the broadcast multicast MBS service from the network device according to the priority information, and the network device may also determine whether to send the broadcast multicast MBS service configuration information to the terminal device according to the priority information. Configuration information.
  • the terminal device receives the second configuration in the first cell, and after completing random access, the terminal device switches from the first cell to the second cell, and receives the second configuration in the second cell.
  • the first configuration of the broadcast-multicast MBS service is the configuration of the MBS service of the second cell received by the terminal device
  • the second configuration is the configuration of the MBS service of the first cell received by the terminal device.
  • the first configuration and the second configuration are configurations of the same MBS service.
  • the first configuration and the second configuration can be the same or different.
  • the network equipment allows the terminal equipment to enter the second cell from the first cell through cell handover (HO), and continues to receive the first configuration of the broadcast-multicast MBS service in the second cell, so it can ensure that the broadcast-multicast MBS service is received Continuity.
  • HO cell handover
  • the terminal device also includes a processing module. After the second cell obtains the first configuration, the processing module can determine whether the second criterion is satisfied. When the second criterion is satisfied, the terminal device can return to the RRC idle state or the RRC inactive state.
  • the second criterion may be that the network device is configured for the terminal device.
  • the second criterion may be included in a random access response message, RRC connection reconfiguration (RRC reconfiguration) or other messages.
  • the second configuration of the MBS service received by the terminal device may also include the identification information of the broadcast-multicast MBS service.
  • the identification information of the broadcast-multicast MBS service is used to identify each MBS service, and the terminal device receives one or more identified MBS services in the first cell. Identify each MBS service through identification information.
  • the transceiver module may send first information to the network device, where the first information is used to indicate a reason for initiating random access. Based on the first information received, the network device will be able to learn that the reason why the terminal device initiates random access at this time is to maintain the continuity of the broadcast-multicast MBS service.
  • An eighth aspect provides a communication device, which may be a network device, and includes: a processing module for generating the second configuration of the broadcast and multicast MBS service, and a sending module for sending the second configuration of the broadcast and multicast MBS service ,
  • the second configuration includes second indication information, and the second indication information is used to indicate that the broadcast multicast MBS service is configured with service continuity.
  • the second indication information for service continuity indication is for each broadcast-multicast MBS service.
  • the second indication information indicates that the broadcast-multicast MBS service is configured with service continuity, which means that the terminal device moves between cells and enters a new cell. In the cell, it is necessary to adopt a business continuity guarantee mechanism for the MBS service.
  • the second configuration may include: configuration information about the multicast broadcast control channel carried in the system information, and control and configuration information about the broadcast multicast data channel carried on the multicast broadcast control channel.
  • the second configuration may also be the on demand SI obtained according to the system information, or the configuration of the MBS service carried on the on demand SI.
  • the second configuration further includes a first criterion for triggering random access, and the first criterion is used for triggering random access by the terminal device.
  • the first criterion may be: the terminal device measures the channel quality or signal quality in the first cell, and when it is determined that the measurement result reaches the threshold, the terminal device initiates random access.
  • the first criterion may be: the signal quality or channel quality reaches the threshold multiple times within the first time period, and the terminal device triggers random access.
  • the first criterion may be: the terminal device triggers random access after the second time period after the signal quality or channel quality measurement result reaches the threshold.
  • the second configuration may include service priority information, that is, the priority corresponding to each broadcast-multicast MBS service.
  • the terminal device may determine whether to request configuration information of the broadcast multicast MBS service from the network device according to the priority information, and the network device may also determine whether to send the broadcast multicast MBS service configuration information to the terminal device according to the priority information. Configuration information.
  • the second indication information is used to indicate whether the broadcast-multicast MBS service is configured with service continuity.
  • the terminal device receives the MBS service configured with service continuity, and needs to adopt a service continuity guarantee mechanism. If the MBS service received by the terminal device is not configured with service continuity, it does not need to adopt a service continuity guarantee mechanism, thereby saving resources while guaranteeing service continuity.
  • a ninth aspect provides a communication device, including a transceiver and a processor, the transceiver is configured to execute instructions for receiving and sending information, and the processor is configured to execute other steps.
  • the communication device is used to execute any possible implementation method of the first aspect or the third aspect.
  • a tenth aspect provides a communication device, including a transceiver and a processor, the transceiver is configured to execute instructions for receiving and sending information, and the processor is configured to execute other steps.
  • the communication device is used to execute any possible implementation method of the second aspect or the fourth aspect.
  • An eleventh aspect provides a computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to implement the method in any possible implementation manner of the first aspect or the third aspect.
  • a twelfth aspect provides a computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to implement the method in any possible implementation manner of the second aspect or the fourth aspect
  • a thirteenth aspect provides a communication system, which includes the communication device described in the fifth aspect and the communication device described in the sixth aspect, or includes the communication device described in the seventh aspect and the communication device described in the eighth aspect.
  • a fourteenth aspect provides a terminal device, the terminal device includes a memory and a processor, the memory is used to store instructions, the processor is used to execute the instructions stored in the memory, and the instructions stored in the memory The execution of causes the processor to execute the method in any possible implementation manner of the first aspect or the third aspect.
  • a fifteenth aspect provides a network device, the network device includes a memory and a processor, the memory is used to store instructions, the processor is used to execute the instructions stored in the memory, and respond to the instructions stored in the memory The execution of causes the processor to execute the method in any possible implementation manner of the second aspect or the fourth aspect.
  • a sixteenth aspect provides a computer program product containing instructions, the computer program product is used to store a computer program, and when the computer program runs on a computer, the computer executes the above-mentioned first aspect or third aspect Any possible implementation method.
  • the seventeenth aspect provides a computer program product containing instructions.
  • the computer program product is used to store a computer program.
  • the computer program runs on a computer, the computer executes the above-mentioned second aspect or fourth aspect. Any possible implementation method.
  • Fig. 1 is a schematic diagram of a communication system suitable for the communication method of the embodiment of the present application.
  • FIG. 2 is a flowchart of a communication method provided by an embodiment of the present application.
  • Fig. 3 is a schematic diagram of a four-step random access process shown in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a two-step random access process shown in an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a terminal device moving from a first cell to a second cell according to an embodiment of the present application
  • FIG. 6 is a schematic diagram of the sending cycle of SC-MCCH and SC-MTCH in the SC-PTM transmission technology provided by an embodiment of the present application;
  • FIG. 7 is a flowchart of another communication method provided by an embodiment of the present application.
  • FIG. 8 is a flowchart of another communication method provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 10 is another schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 11 is another schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 12 is a schematic diagram of another structure of a communication device provided by an embodiment of the present application.
  • the terminal devices involved in this application include devices that provide voice to users, devices that provide users with data connectivity, and devices that provide users with voice and data connectivity.
  • it may include a handheld device with a wireless connection function, or a processing device connected to a wireless modem. It can also be referred to as a terminal for short.
  • the terminal can communicate with the core network via a radio access network (RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN.
  • RAN radio access network
  • the terminal may include user equipment (UE), wireless terminal, mobile terminal, device-to-device communication (device-to-device, D2D) terminal, vehicle to everything (V2X) terminal, machine-to-machine/ Machine-to-machine/machine-type communications (M2M/MTC) terminals, Internet of things (IoT) terminals, subscriber units, subscriber stations, mobile stations station), remote station (remote station), access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), or User equipment (user device), etc.
  • It may include mobile phones (or “cellular” phones), computers with mobile terminals, portable, pocket-sized, handheld, and mobile devices with built-in computers, and so on.
  • PCS personal communication service
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistants
  • restricted devices devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities.
  • information sensing equipment such as barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), and laser scanners.
  • RFID radio frequency identification
  • GPS global positioning system
  • the terminal may also be a wearable device.
  • Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is the general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes Wait.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which need to cooperate with other devices such as smart phones.
  • Use such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.
  • the various terminals described above if they are located on a vehicle, such as placed in or installed in a vehicle, can be considered as vehicle-mounted terminals.
  • vehicle-mounted terminals are, for example, also called on-board units (OBU).
  • OBU on-board units
  • the device for implementing the function of the terminal may be a terminal, or a circuit capable of supporting the terminal to implement the function, for example, a circuit that can be applied to a chip system, and the chip system may be installed in the terminal.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the device used to implement the functions of the terminal is an example to describe the technical solutions provided by the embodiments of the present application.
  • the network equipment involved in this application may include a radio access network (RAN) equipment, such as a base station (for example, an access point). It may refer to a device that communicates with a terminal device through an air interface in the access network, or that a network device in a vehicle-to-everything (V2X) technology is a roadside unit (RSU).
  • the base station can be used to convert received air frames and IP packets into each other, and act as a router between the terminal and the rest of the access network, where the rest of the access network can include the IP network.
  • the RSU can be a fixed infrastructure entity that supports V2X applications, and exchanges messages with other entities that support V2X applications.
  • the network equipment can also coordinate the attribute management of the air interface.
  • the network equipment may include a long term evolution (LTE) system or an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (advanced, LTE-A) system, Or it can also include the next generation in the evolved packet core (EPC), the 5th generation (5G), and the new radio (NR) system (also referred to as the NR system) Node B (next generation node B, gNB) or including the centralized unit (CU) and distributed unit (DU) in the cloud radio access network (Cloud RAN) system, this application
  • LTE long term evolution
  • LTE-A long term evolution
  • LTE-A long term evolution
  • EPC evolved packet core
  • 5G 5th generation
  • NR new radio
  • Node B node B
  • gNB centralized unit
  • DU distributed unit
  • Cloud RAN cloud radio access network
  • the network equipment may also include core network equipment, which includes, for example, access and mobility management functions (AMF).
  • AMF access and mobility management functions
  • MBS multicast broadcast service
  • MBS is called a broadcast multicast service, which is a point-to-multipoint service used to realize a data service that simultaneously transmits a certain type of content from a data service source to multiple users in a specific range.
  • a broadcast multicast service which is a point-to-multipoint service used to realize a data service that simultaneously transmits a certain type of content from a data service source to multiple users in a specific range.
  • MBMS Multimedia Broadcast Multicast Service
  • 3GPP R6 3GPP R6
  • MBMS supports two modes of multimedia broadcasting service and multicast service. It can broadcast multimedia video information directly to all users, or send it to a group of paid subscription users to watch, and can help operators develop multimedia advertising, free and pay TV channels , MMS group sending and other commercial applications, operators can develop mobile TV services with lower network deployment costs.
  • eMBMS is an enhanced broadcast multicast technology on Long Term Evolution (LTE) networks, and one of the video bearer technologies in the mobile field.
  • LTE Long Term Evolution
  • eMBMS technology can support a larger bandwidth, which means that it can provide more channels and video content, while the video screen is clearer and smoother, and the user experience is better.
  • MBS includes two transmission technologies: multi-cell coordinated transmission technology and single-cell transmission technology.
  • multi-cell coordinated transmission technology includes Multimedia Broadcast Multicast service Single Frequency Network (MBSFN), and single-cell transmission technology includes Single-Cell Point-to-Multipoint (Single-Cell Point-to-Multipoint, SC-PTM).
  • MBSFN Multimedia Broadcast Multicast service Single Frequency Network
  • SC-PTM Single-Cell Point-to-Multipoint
  • the reception and transmission of MBS services may involve any of the following three forms:
  • MBS may have multicast logical channels: MBS service control channel (Multi-cast Control Channel, MCCH) and MBS data channel (Multicast Traffic Channel, MTCH).
  • the terminal device receives system information (SI) sent by the network device, and the SI includes information required by the terminal device to obtain multicast service control information, such as MCCH configuration information.
  • SI system information
  • the terminal device monitors the MCCH according to the configuration information, and obtains control information for the MBS service, such as MTCH configuration information.
  • the terminal equipment monitors the MTCH channel according to the configuration information of the MTCH, so as to obtain the data of the MBS service.
  • Form 2 The terminal device receives the SI sent by the network device, and the terminal device obtains on-demand system information (SI) according to the SI. on demand
  • SI system information
  • the configuration information of the MBS service is carried on the SI, and the terminal device obtains the data of the MBS service according to the configuration information.
  • Form 3 The terminal equipment obtains the configuration information of the MBS service broadcast by the network equipment in the cell, and the configuration information of the MBS service can be received by all terminal equipment in the cell.
  • the terminal device obtains the data of the MBS service according to the received configuration information of the MBS service.
  • SC-PTM is a broadcast multicast transmission technology that enhances the performance of the air interface, improves radio efficiency and reduces time delay.
  • SC-PTM supports broadcast and multicast services in a single cell, and the broadcast and multicast area can be dynamically adjusted cell by cell according to the distribution of users.
  • SC-PTM uses the LTE Physical Downlink Shared Channel (PDSCH) to transmit broadcast and multicast services, and uses the Public Radio Network Temporary Identifier (G-RNTI) as A group of users is scheduled.
  • PDSCH Physical Downlink Shared Channel
  • G-RNTI Public Radio Network Temporary Identifier
  • SC-PTM is particularly suitable for the following situations: Due to user interest, broadcast-multicast services are expected to be delivered to some cells, and related cells may change dynamically due to user movement. SC-PTM can effectively use radio and flexibly deploy many applications, such as critical communications, automobile traffic information, and on-demand TV services.
  • the SC-PTM technology can also adopt the above three forms to realize the reception of the MBS service. Take form one as an example to introduce the process of obtaining the MBS service in the SC-PTM technology.
  • SC-MCCH Single Cell Multi-cast Control Channel
  • the configuration message indicates the ongoing MBS session and information about when each session can be scheduled, such as scheduling period (scheduling period), scheduling window (scheduling window), and start offset (start offset).
  • the SC-PTM configuration message also provides information on whether the neighboring cell sends an MBS session.
  • the SC-MCCH is mapped to the PDSCH, so the control information of the SC-PTM service is scheduled on the physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • the system information provides SC-PTM control information, which is mainly information needed to obtain SC-MCCH.
  • the sending of SC-MCCH information uses a configurable repetition period for regular sending. Therefore, the SC-MCCH is repeatedly broadcast in a cell where the MBS service is performed in a certain period.
  • the time domain resources for monitoring SC-MCCH are configured in System Information Block Type 20 (SIB20), the specific configuration parameters include: SC-MCCH period and offset, SC-MCCH appears periodically The first subframe scheduled by SC-MCCH, the duration of the SC-MCCH scheduled from the first subframe.
  • SIB20 System Information Block Type 20
  • SC-MTCH Single Cell Multicast Traffic Channel
  • Radio Network Temporary Identifier (RNTI)
  • RNTI is a network distribution terminal equipment, used to mark different terminal equipment. According to different functions, multiple RNTIs are divided. Each terminal device can correspond to multiple RNTIs at the same time. Different types of RNTIs target different scenarios, but the working principle of RNTIs is the same, that is, RNTI is used to scramble the cyclic redundancy code (cyclic redundancy code) of wireless channel information. redundancy code, CRC) part.
  • CRC redundancy code
  • a corresponding RNTI value is required on the terminal device side to successfully decode the received resource.
  • the terminal device will search for public RNTI in the common search space (Common Search Space) of the PDCCH, such as P-RNTI (paging RNTI), SI-RNTI (system information RNTI). Other RNTIs generally configure a corresponding search space (Specific Search Space), and the terminal device searches in the corresponding search space. If the corresponding information can be successfully decoded, the terminal device can read the information carried in the
  • G-RNTI is Group RNTI.
  • G-RNTI can be used to scramble corresponding downlink control information (downlink control information, DCI), which is carried by PDCCH.
  • DCI downlink control information
  • the idle state refers to the state the terminal device is in when the terminal device is camped in the cell, but the random access process is not performed.
  • the terminal device usually enters the idle state after being turned on or after the RRC is released.
  • the connected state refers to the state that the terminal device is in when it has not performed the RRC release after completing the random access process.
  • the terminal device can perform data transmission with the network device in the connected state.
  • the state of the terminal device transitions to the connected state.
  • the inactive state is the state between the connected state and the idle state. In the inactive state, the user plane bearer of the air interface has been suspended.
  • the radio access network (RAN)-core network The user plane bearer and control plane bearer between the (core network, CN) are still maintained.
  • a terminal device initiates a call or service request, it needs to activate the user plane bearer of the air interface, and reuse the existing user plane bearer and control plane bearer between the RAN-CN.
  • each cell only covers a limited area. Therefore, when a terminal device moves from the current serving cell to an adjacent cell, in order to ensure service continuity, the network side needs to switch the service to the adjacent cell. Do not interrupt the communication process.
  • handover refers to the process of switching the link carrying communication data from one cell or network device to another cell or network device in order to ensure that the communication is not interrupted in the process of mobile communication.
  • the handover across base stations is initiated by the source network device, and the source network device decides to switch the terminal device according to the measurement result reported by the terminal device, and sends a handover request to the target network device.
  • the source network device obtains the response that the target network device allows switching, the source network device sends a switching command to the terminal device.
  • the terminal device stops sending uplink or downlink data with the source network device, starts to synchronize with the target network device, and initiates a random access process.
  • the source network device sends a handover command to the terminal device, it can stop the uplink or downlink data transmission with the terminal device, and send the data stored in the source network device to the target network device.
  • the terminal device successfully accesses the target network device, it can start to transmit uplink or downlink data with the target network device.
  • LTE worldwide interoperability for microwave access
  • WiMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • NR future communication systems, such as 6G systems.
  • FIG. 1 shows a schematic diagram of a communication system applicable to the communication method of the embodiment of the present application.
  • the communication system 100 includes a network device 102 and a terminal device 106.
  • the network device 102 may be configured with multiple antennas, and the terminal device may also be configured with multiple antennas.
  • the communication system may further include a network device 104, and the network device 104 may also be configured with multiple antennas.
  • FIG. 1 is only a simplified schematic diagram of an example for ease of understanding.
  • the communication system may also include other network devices or other terminal devices, which is not shown in FIG. 1.
  • the network device 102 or the network device 104 may also include multiple components related to signal transmission and reception. For example, a processor, modulator, multiplexer, demodulator, or demultiplexer, etc.
  • both the network device 102 and the network device 104 can communicate with multiple terminal devices, such as the terminal device 106 shown in the figure.
  • the terminal device communicating with the network device 102 and the terminal device communicating with the network device 104 may be the same or different.
  • the terminal device 106 shown in FIG. 1 can communicate with the network device 102 and the network device 104 at the same time. However, this only shows a possible scenario. In some scenarios, the terminal device may only communicate with the network device 102 or the network device 104, which is not limited in this application.
  • the embodiment of the present application takes the SC-PTM transmission technology as an example for specific description, but it can be understood that the technical solution of the embodiment of the present application is also applicable to the multi-cell coordinated transmission technology.
  • the embodiments of the application are not only applicable to the broadcast and multicast services in the LTE system and the LTE-A system, but also apply to the broadcast and multicast services in the NR wireless network system.
  • the single cell multicast data channel SC-MTCH is used to transmit the MBS service data of the broadcast multicast service.
  • the SC-MTCH is configured and controlled by the MBS single cell multicast control channel SC-MCCH.
  • the SC-MCCH configuration information is broadcast by the system information of the cell where the terminal device resides.
  • the system information includes the SC-MCCH modification period, repetition period, and radio frame offset.
  • each cell is configured with one SC-MCCH
  • each MBS service is configured with one SC-MTCH.
  • the repetition period of the SC-MCCH is restricted by the resource configuration of the network equipment and the MBS service requirements, and usually cannot be very short.
  • the terminal device When the terminal device needs to receive the MBS service, the terminal device first receives the system information to obtain the SC-MCCH configuration information, and then according to the SC-MCCH configuration information, waits for the SC-MCCH sending opportunity to obtain the SC-MTCH carried on the SC-MCCH Configuration information. Due to the limitation of the SC-MCCH cycle length, this process usually takes a certain amount of time.
  • the embodiment of the present application provides a communication method.
  • the terminal device can quickly obtain the configuration information required by the MBS service by actively sending the request for the MBS service configuration to the network device, thereby receiving the data of the MBS service.
  • Fig. 2 is a flowchart of a communication method provided by an embodiment of the present application.
  • the communication method provided by an embodiment of the present application will be described in detail below with reference to Figs. 2 to 4.
  • the communication method includes:
  • the terminal device sends a random access message to the network device, and the network device receives the random access message sent by the terminal device.
  • the random access message includes first indication information, the first indication information is used to request the first configuration, and the first configuration is the configuration of the broadcast-multicast MBS service.
  • the cell where the terminal device is located plays one or more MBS services.
  • the terminal device When the terminal device is interested in the one or more MBS services, the terminal device sends a random access message to the network device by initiating random access.
  • the random access message includes first indication information for requesting a first configuration from the network device, and the first configuration is the configuration of one or more MBS services that the terminal device is interested in.
  • the network device sends the first configuration broadcast multicast of the broadcast-multicast MBS service to the terminal device in response to the first indication information, and the terminal device receives the first configuration.
  • the terminal device when the terminal device needs to receive the MBS service, it actively sends a random access message to the network device, and requests the configuration of the MBS service from the network device through the random access message, thereby completing the reception of the MBS service.
  • the terminal device obtains MBS with short delay and flexible acquisition.
  • Figures 3 and 4 are schematic diagrams of a four-step random access process and a two-step random access process respectively shown in an embodiment of the present application. The above steps will be described in detail below with reference to Figures 3 and 4.
  • the cell where the terminal device is located plays one or more MBS services, and the one or more MBMS services are sent by the network device to multiple terminal devices in the cell.
  • the terminal device For a terminal device in an RRC idle state or an RRC inactive state, when the terminal device wants to receive one or more MBS services, the terminal device sends a random access message to the network device, and the random access message includes the first indication information for request The network device sends the first configuration.
  • the random access process can be a four-step random access process.
  • the terminal device sends a random access message 1 (Random Access Message 1, RA Msg1) to the network device, that is, a random access request or a random access preamble (Random Access Preamble).
  • the random access request is sent on the random access resource, that is, the uplink random access channel (Random Access Channel, RACH), and the preamble carried in the random access request implies the random number that the terminal device needs to send.
  • the size of access message 3 (Random Access Message3, RA Msg3).
  • the network device sends a random access response (Random Access Response) to the terminal device, that is, a random access message 2 (Random Access Message 2, RA Msg2).
  • a random access message 2 Random Access Message 2, RA Msg2
  • the network device After receiving the random access request, the network device sends a random access response on the downlink shared channel.
  • the random access response is generated by the Media Access Control (MAC) layer.
  • MAC Media Access Control
  • the terminal device sends a random access message 3 on the uplink shared channel according to the resources indicated in the random access response.
  • the network device sends a random access message 4 (Random Access Message 4, RA Msg4) to the terminal device.
  • RA Msg4 Random Access Message 4, RA Msg4
  • the first indication information may be included in the random access message 3.
  • the network device sends the random access message 2 in response to the random access request of the terminal device, and the terminal device sends the first indication information by sending the random access message 3.
  • the first indication information is used to request the configuration of the MBS service from the network device.
  • the network device may send the first configuration through a random access message 4.
  • the random access process can be a two-step random access process. As shown in Figure 4, in the NR wireless network system, a two-step random access process is proposed for scenarios where terminal equipment and network equipment do not need to be synchronized.
  • the random access message A (Random Access Message A, RA MsgA) in the two-step random access process includes a random access code part and a data part, and the two parts can be decoded independently.
  • the random access message A is similar to RA Msg1+RA Msg3 of four-step random access.
  • the random access code part is used to send the preamble code, that is, the random access code preamble of RA Msg1 in four-step random access; the data part is similar to RA Msg3 in four-step random access.
  • Random Access Message B Random Access Message B (Random Access Message B, RA MsgB) is similar to RA Msg2+RA Msg4 in four-step random access.
  • the first indication information may be included in the random access message A, and the terminal device sends the first indication information by sending the random access message A.
  • the first indication information is used to request the configuration of the MBS service from the network device.
  • the network device sends the first configuration through a random access message B.
  • the network device sends the first configuration to the terminal device in response to the first indication information.
  • the network device may send the first configuration through the random access message 4 in the four-step random access process, and may also send the first configuration through the random access message B in the two-step random access process. This depends on whether the terminal device uses a four-step random access process or a two-step random access process to send the first indication information.
  • the first configuration in the embodiment of the present application may include: the control and configuration information about the SC-MCCH carried in the system information block, and the information about the SC-MCCH carried on the SC-MCCH
  • the system information block can be SIB20.
  • MBS services can also be obtained in form two and form three.
  • the first configuration in the embodiment of the present application may be on demand SI, or the configuration of the MBS service carried on on demand SI.
  • the first configuration in the embodiment of the present application may include the configuration of the MBS service broadcast through system information.
  • the embodiments of this application are applicable to the broadcast multicast MBMS service in the LTE system, the LTE-A system, and the MBS service in the wireless network system after NR or NR, and support the scenarios of multi-cell coordinated transmission or other multicast transmission technologies .
  • the first configuration in the embodiment of the present application may include the MBS service configuration in the first, second, and third forms of the MBS service reception.
  • the configuration of the MBS service in form one includes: the control and configuration information about MCCH carried in the system information, or the control and configuration information about the broadcast multicast service MTCH carried on the MCCH, or other configurations related to MBS service transmission .
  • the configuration of the MBS service in the second form includes: the on demand SI included in the broadcast SI, or the configuration of the MBS service carried on the on demand SI, or other configuration information related to MBS service transmission.
  • the configuration of the MBS service in the third form includes the configuration of the MBS service broadcast through the system information.
  • the terminal device in the embodiment of the present application requests the network device for the configuration of the MBS service of interest through the random access process, thereby realizing rapid reception of the MBS service, reducing the delay of MBS service transmission, and improving the transmission flexibility of the MBS service.
  • a typical transmission technology in the multi-cell coordinated transmission technology is the MBSFN technology.
  • MBSFN is a synchronous broadcast transmission technology, which refers to transmitting the same wireless signal from multiple cells at the same time.
  • MBSFN area includes a group of cells, and this group of cells is coordinated to complete an MBSFN transmission.
  • a cell can belong to multiple MBSFN areas, and each MBSFN area transmits different content and has different cell sets.
  • a terminal device when a terminal device is interested in one or more MBS services in the MBSFN area, it initiates a random access request to the network device, which is a network device that sends the MBMS service to the MBSFN area.
  • the embodiment of the application also provides another communication method.
  • the embodiment of the application also takes the SC-PTM transmission technology as an example for specific description, but it is understandable that the technical solution of the embodiment of the application is also applicable to the multi-cell coordinated transmission technology. And other multicast transmission technologies.
  • the embodiments of this application are not only applicable to the broadcast and multicast services in the LTE system and the LTE-A system, but also to the broadcast and multicast services in the NR wireless network system.
  • FIG. 5 is a schematic diagram of a terminal device moving from a first cell to a second cell according to an embodiment of the present application
  • FIG. 6 is a schematic diagram of SC-MCCH and SC-MTCH transmission cycles in the SC-PTM transmission technology provided by an embodiment of the present application
  • Figure 7 is a flowchart of another communication method provided by an embodiment of the present application.
  • the terminal device receives the broadcast multicast MBS service in the first cell, and at the same time, the terminal device moves from the first cell to the second cell due to mobility requirements.
  • the second cell is playing or will play the MBS service that the terminal device is receiving in the first cell, and the terminal device needs to continue to receive the MBS service after entering the second cell.
  • Both the first cell and the second cell support the transmission of MBS services, including supporting the SC-PTM transmission mode.
  • the network equipment transmits the MBS service to the terminal equipment located in the first cell on the first cell, and the network equipment transmits the MBS service to the terminal equipment located in the second cell on the second cell.
  • the MBS service played by the first cell and the second cell may be the same service, for example, both are broadcasting a live broadcast of a certain major sports event
  • the configuration information of the first cell and the second cell for broadcasting the MBS service may be different. After the terminal device moves from the first cell to the second cell, it needs to re-acquire the configuration of the MBS service.
  • the following describes the process of reacquiring the configuration of the MBS by the terminal device moving from the first cell to the second cell in the SC-PTM scenario.
  • the terminal equipment enters the second cell from the first cell through the cell reselection process. Since the MBS service configuration of the first cell and the second cell may be different, the configuration time and frequency domain position at which the terminal device can monitor and receive the MBS service may also be different. After the terminal device reselects from the first cell to the second cell, in order to continue to receive one or more MBS services, it needs to first receive the configuration of the MBS service in the second cell. The terminal device receives the data of the MBS service according to this configuration, such as the data of the service carried on the SC-MTCH or other logical channels. Since the configuration of the MBS service is repeatedly sent in a certain period, the terminal device needs to wait until the sending time of the configuration of the MBS service after completing the cell reselection before receiving the configuration of the MBS service.
  • the MBS service configuration SC-MCCH and SC-MTCH are taken as examples for description.
  • the sending timing of SC-MCCH on the first cell and the second cell are represented by unfilled rectangular boxes.
  • the time length represents the sending period of the SC-MCCH on the first cell and the second cell, and the SC-MCCH configuration of the first cell and the second cell may be different.
  • the sending timing of the SC-MTCH on the first cell and the second cell is represented by rectangular boxes filled with diagonal lines, and the length of time between adjacent rectangular boxes represents the repetition period of the SC-MTCH of the first cell and the second cell.
  • the terminal device enters the second cell from the first cell through cell reselection at time t1.
  • the terminal device When the terminal device enters the second cell, the previous SC-MCCH has been sent out, and there is still a period of time before the sending time t2 of the next SC-MCCH.
  • the terminal device can only receive the configuration carried by the SC-MCCH until the next SC-MCCH is sent, and the length of the waiting time depends on the sending period of the SC-MCCH in the second cell.
  • the MBS service is in an interrupted state, which not only causes the delay and interruption of data transmission, but also cannot guarantee the requirements for communication quality.
  • the communication method provided by the embodiment of the present application can improve the continuity of receiving the MBS service after the terminal device that is receiving the MBS service changes the cell.
  • the communication method includes:
  • the terminal device receives the second configuration sent by the first cell, where the second configuration is the configuration of the broadcast-multicast MBS service.
  • the first cell broadcasts one or more broadcast-multicast MBS services to terminal devices in the first cell.
  • the first cell can use SC-PTM technology to transmit MBS services.
  • the terminal device in the first cell receives one or more MBS services of interest. In a possible way, when the terminal device receives the MBS service, it first receives the system information, and obtains the configuration information of the SC-MCCH through the system information.
  • the configuration information of the SC-MCCH includes the repetition period of the SC-MCCH.
  • the second configuration is the configuration of the broadcast-multicast MBS service
  • the configuration of the broadcast-multicast MBS service may be the configuration and control information about the SC-MTCH carried by the SC-MCCH logical channel
  • the second configuration sent by the first cell means that the network device sends the second configuration on the first cell.
  • the first cell broadcasts one or more broadcast multicast MBS services means that the network device broadcasts one or more broadcast multicast services on the first cell. Broadcast MBS business.
  • the first configuration is the configuration of the MBS service of the second cell received by the terminal device
  • the second configuration is the configuration of the MBS service of the first cell received by the terminal device.
  • the first configuration and the second configuration are configurations of the same MBS service.
  • the first configuration and the second configuration can be the same or different.
  • the first configuration and the second configuration in the embodiment of the present application may be the same as the content included in the first configuration in the embodiment of FIG. 2 to FIG. 4, which will not be listed here.
  • S702 The terminal device camps on the second cell through cell reselection.
  • the terminal device Based on mobility requirements, terminal equipment needs to move from the first cell to the second cell.
  • the terminal device camps on the second cell through cell reselection.
  • the second cell broadcasts one or more MBS services that the terminal device is receiving in the first cell.
  • the terminal device resides in the second cell and has a requirement to continue receiving the MBS service originally received in the first cell.
  • the terminal device sends a random access message to the network device in the second cell, where the random access message includes first indication information, the first indication information is used to request the first configuration, and the first configuration is the configuration of the broadcast-multicast MBS service.
  • the terminal device sends a random access message in the second cell, and the network device that receives the random access message broadcasts one or more broadcast-multicast MBS services on the second cell.
  • the MBS service received by the terminal device in the first cell and the MBS service received in the second cell may be the same, for example, a live broadcast of the same major sports event.
  • the remaining specific details of step S703 are the same as those of step S201, and S703 in this embodiment can be understood with reference to S201, which will not be repeated here.
  • step S704 The network device sends the first configuration to the terminal device in response to the first indication information. It can be understood that the network device in this step sends the first configuration on the second cell to the terminal device in the second cell. The first configuration is sent by the network device to the terminal device that resides in the second cell after cell reselection. .
  • the remaining specific details of step S704 are the same as those of step S202, and S704 in this embodiment can be understood with reference to S202, which will not be repeated here.
  • the terminal device receives the configuration of MBS in the first cell, and after the terminal device moves to the second cell, the terminal device actively initiates a random access procedure to request the configuration of the MBS service from the second cell. Therefore, there is no need to wait for the sending timing of the configuration of the MBS service in the second cell, reducing the time delay of receiving the MBS service due to the movement of the terminal equipment, and enhancing the continuity of the MBS service.
  • Steps 701 to 704 will be specifically described below in conjunction with exemplary optional implementation manners.
  • the terminal device receives the second configuration of the broadcast-multicast MBS service in the first cell.
  • the second configuration may be information carried on the SC-MCCH logical channel, including SC-MTCH configuration information and control information. It can be understood that for SC-PTM scenarios, one cell usually has one SC-MCCH, and one MBS service is configured with one SC-MTCH.
  • the configuration of multiple MBS services is carried on the logical channel SC-MCCH.
  • the second configuration may include the identification information of the broadcast-multicast MBS service.
  • the identification information of the broadcast-multicast MBS service can include but is not limited to: Temporary Mobile Group Identity (TMGI), Service Identifier (ID), used to schedule a group of terminal equipment RNTI, such as G -RNTI, it can also be other IE or field, and any information used to indicate this MBS service.
  • TMGI Temporary Mobile Group Identity
  • ID Service Identifier
  • the identification information of the broadcast-multicast MBS service is used to identify each MBS service, and the terminal device receives one or more identified MBS services in the first cell. Identify each MBS service through identification information.
  • the terminal device camps on the second cell through cell reselection, and requests the second cell for the configuration of one or more or all MBS services received in the first cell.
  • the second configuration may also include second indication information.
  • the second indication information is used to indicate that the broadcast-multicast MBS service configuration has a requirement to ensure service continuity, such as the service interruption time or whether the interruption is allowed, and the service continuity is enhanced. Requests, etc., send random access messages based on business continuity.
  • the second configuration may also include service priority information, that is, the priority corresponding to each broadcast-multicast MBS service.
  • the terminal device may decide whether to request the configuration information of the broadcast multicast MBS service from the network device according to the priority information.
  • the network device may also decide whether to send the configuration information of the broadcast-multicast MBS service to the terminal device according to the priority information.
  • both the second indication information and the identification information of the broadcast-multicast MBS service can be included in the second configuration, it is understandable that the second configuration can be carried in different signaling and sent separately. Therefore, the second indication information and the identification information of the MBS service can be sent in different signaling.
  • the terminal device receives the second configuration in the first cell, and the second configuration may include the second indication information.
  • the second configuration may be information carried on the SC-MCCH logical channel, and the configuration of multiple MBS services carried on the logical channel SC-MCCH.
  • the second indication information may indicate whether the MBS service is configured with service continuity. If the MBS service received by the terminal device in the first cell is instructed to be configured with service continuity, when the terminal device moves to the second cell and the terminal device receives the MBS service configured with service continuity in the second cell, it is required Adopt a business continuity guarantee mechanism. That is, the terminal device entering the second cell needs to send a random access message to the second cell, requesting the second cell to send the configuration of the MBS service.
  • the terminal device may not send random access messages for the reception of the MBS service in the second cell , But wait for the second cell to send the MBS service configuration to the terminal device at the inherent sending timing.
  • the terminal device receives five MBS services in the first cell: MBS1, MBS2, MBS3, MBS4, MBS5, and the SC-MCCH logical channel carries the configuration information of SC-MTCH1, the configuration information of SC-MTCH2, and SC-MTCH3.
  • the configuration information of SC-MTCH4, the configuration information of SC-MTCH5, SC-MTCH1 ⁇ SC-MTCH5 carry data of MBS1 ⁇ MBS5, respectively.
  • the second indication information may indicate that MBS1, MBS2, and MBS3 are configured with service continuity.
  • the second indication information may indicate that the MBS1, MBS2, and MBS3 services are configured with service continuity in the configuration information of SC-MTCH1, the configuration information of SC-MTCH2, and the configuration information of SC-MTCH3, respectively.
  • the terminal device sends a random access message to the second cell.
  • the random access message includes the first indication information for requesting the second cell to send MBS1, MBS2, MBS3 service configuration.
  • the second cell sends the first configuration to the terminal device in response to the first indication information.
  • the first configuration sent by the second cell to the terminal device is the configuration of the MBS1, MBS2, and MBS3 services, and does not include the configuration of the MBS4 and MBS5 services.
  • the optional terminal device can also request the configuration information of the MBS service according to the service priority. For example, the priority of MBS1 and MBS2 is high, and the priority of MBS3 is medium.
  • the terminal device can choose to request configuration information of different MBS services according to factors such as channel quality and uplink resource size, and the priority order of the requested services is from high to low. For example, the terminal device first requests the configuration information of MBS1 and MBS2, and then requests the configuration information of MBS3, or no longer requests the configuration information of MBS3.
  • the network device can also choose to send different MBS service configuration information according to the received MBS service configuration request information, combined with current resource usage, channel quality and other factors, and the priority order of the sent services is from high to low. For example, the network device first sends the configuration information of MBS1 and MBS2, and then sends the configuration information of MBS3. In the case of limited resources, MBS3 configuration information may not be sent.
  • the terminal device can receive the MBS service and its configuration information in a more flexible manner according to the indication of the second indication information.
  • the terminal device in the second cell only needs to request the configuration of the MBS service that needs to ensure service continuity from the network device, and the configuration of other MBS services in the second cell does not need to be requested.
  • the second indication information may be a display indication or an implicit indication.
  • an IE or field can be added to the second configuration, and the attribute of the IE or field can be an enumerated type, for example, it can enumerate ⁇ ture/false ⁇ , or it can enumerate ⁇ supported/notSupported ⁇ . True or supported may indicate that the indicated MBS service is configured with service continuity, and false or notSupported may indicate that the indicated MBS service is not configured with service continuity.
  • the MBS service can be indicated by mapping the MBS service to a specific radio bearer (radio bearer, RB), such as a specific data radio bearer (DRB) or a multicast radio bearer (MBS point to multipoint radio). bearer, MRB).
  • the second configuration in the embodiment of the present application includes the second indication information, which can realize the binding of the MBS service and the service continuity mechanism.
  • the second indication information may indicate that one or some MBS services broadcast in a cell adopt a service continuity mechanism when the terminal device moves. Thereby reducing the transmission delay of a specific MBS service.
  • the second cell where the terminal device resides through cell reselection is broadcasting at least one MBS service received by the terminal device in the first cell.
  • the terminal device When the terminal device resides in the second cell through cell reselection, the terminal device continues to receive this One or more MBS services.
  • the second cell and the first cell also support MBS service transmission.
  • the SC-PTM transmission technology may be used to broadcast the MBS service.
  • the transmission principle of form one of the SC-PTM technology introduced in the above content is the same.
  • the second cell broadcasts system information
  • the terminal device first receives the system information, and obtains the configuration information of the SC-MCCH according to the system information, and according to the configuration of the SC-MCCH Information, obtain the configuration information of the SC-MTCH carried on the SC-MCCH, and then obtain the data of the MBS service carried on the SC-MTCH.
  • the transmission cycle, transmission time, etc. of the SC-MCCH in the second cell may be different from the transmission cycle, transmission time, etc., of the SC-MCCH in the first cell. If the terminal device camps in the second cell and does not send a random access message to the second cell, but waits for the opportunity to receive the SC-MCCH sent by the second cell, due to the uncertainty of the time the terminal device resides in the second cell, As a result, the length of time the terminal device waits to receive the SC-MCCH is uncertain. Assuming that the SC-MCCH happens when the terminal device enters the second cell, the terminal device does not need to send a random access message to the second cell to request the configuration of the MBS service.
  • the terminal device when the terminal device is camping in the second cell, it first receives the system information of the second cell, and determines whether to send a random access message according to the system information.
  • the system information carries the configuration modification period, repetition period, and radio frame offset of the MBS service.
  • the terminal device After receiving the system information, the terminal device can learn the configuration time of the next MBS service sent by the second cell, so that the terminal device decides whether to send a random access message to the second cell to request the configuration of MBS.
  • the MBS configuration sent by the network device according to the transmission period inherent to the MBS service in the second cell is referred to as the third configuration of the MBS service.
  • the inherent transmission cycle of the configuration of the MBS service in the second cell refers to the cycle of transmission of the configuration of the MBS service specified in the agreement by the second cell. It can be understood that the content of the third configuration and the first configuration may be the same, because they are both sent by the second cell regarding the configuration of the MBS service on the second cell.
  • the first configuration requested by the terminal device is the configuration of the MBS service that needs to ensure business continuity
  • the third configuration is related to the second cell actively sent by the network device.
  • MBS service configuration MBS service configuration. Therefore, the content of the third configuration may include the content of the first configuration, but the content about the configuration of the same MBS service of the two is the same.
  • the first configuration is sent by the network device after the terminal device sends a random access message to the network device to request the configuration of the MBS.
  • the transmission of the third configuration does not require the terminal device to request the network device. Therefore, the time for the second cell to send the first configuration has nothing to do with the repetition period of the MBS service configuration of the second cell.
  • the second cell sends the third configuration of the broadcast-multicast MBS service.
  • the third configuration of the broadcast-multicast MBS service is the configuration information of the MBS service supported in the cell, including the information of the MBS that the terminal device resides in the second cell and wants to receive The configuration of the business.
  • the terminal device can determine the time when the terminal device receives the third configuration on the second cell according to the system information, and the terminal device can determine whether to send a random access message according to the time. It should be noted that determining the time when the terminal device receives the third configuration does not refer to the time when the terminal device actually received the third configuration, but rather the time when the terminal device does not send a random access message and waits to receive the third configuration. When the third configuration is received. In other words, there is a situation where the terminal device has not sent a random access message, but only determines the time to receive the third configuration according to the system information.
  • the terminal device when the terminal device enters the second cell, there may not be a sending timing just in time for the third configuration.
  • the terminal device can determine the time to receive the next third configuration after entering the second cell.
  • the terminal device compares the time of receiving the third configuration with the time of receiving the first configuration. When it is confirmed that the time to receive the third configuration is later than the time to receive the first configuration, it means that if the terminal device does not send a random access message to the network device to request the configuration of the MBS service, it will wait a longer time to obtain the third configuration. Therefore, the terminal device sends a random access message at this time to request the first configuration from the second cell.
  • the terminal device can choose to send a random access message to the network device, or can choose to wait to receive the third configuration sent by the network device. In other words, the terminal determines which of the third configuration and the first configuration arrived earlier, and then receives the earlier configuration.
  • the terminal device can make a prediction on the time when the first configuration is received.
  • This pre-judgment process is: the terminal device can calculate the time of the random access process and the response time of the network device, starting from the time of receiving system information, after the time of the random access process and the response time of the network device, it is the terminal The time when the device received the first configuration.
  • the system information is system information including the configuration of the MBS service.
  • the process for the terminal device to determine the time to receive the third configuration according to the system information is as follows: the system information carries information such as the transmission period and offset of the third configuration sent by the second cell, and the subframe, time slot, and symbol at which the configuration information starts to be transmitted.
  • the terminal device can determine the time for the second cell to send the next third configuration after the terminal device enters the second cell according to the transmission period, offset and configuration information of the third configuration, the subframe, time slot, symbol and other information to start transmission. , Which is the time when the terminal device receives the third configuration.
  • the terminal device can obtain the configuration of the MBS service in a shorter time, thereby improving the continuity of receiving the MBS service of the terminal device during the movement between cells and improving communication quality.
  • the embodiments of the present application are also applicable to scenarios where a terminal device moves from one MBSFN area to another MBSFN area.
  • FIG. 8 is a flowchart of another communication method provided by the embodiment of the present application.
  • the communication method provided by the embodiment of the present application can also be used to solve the problem of the continuity of MBS service reception when the terminal device moves from one cell to another cell.
  • the terminal equipment in the RRC idle state or the RRC inactive state if it is receiving the MBS service in the original cell when moving to the target cell, after entering the target cell through cell reselection, the MBS service is acquired in the target cell again, if multicast
  • the configuration information is periodically broadcast information.
  • the terminal device will interrupt the MBS service received in the original cell, and can continue to receive the multicast service after the new cell receives the configuration.
  • This process usually has a large service interruption and Time delay.
  • a service continuity guarantee mechanism can be adopted. But for different MBS services, the requirements for service quality or continuity may not be consistent. Some MBS service quality or continuity requirements are low, and the service interruption caused by the movement of terminal equipment between cells does not have much impact on the MBS service itself. But for those MBS services that need to overcome system delays and ensure business continuity, a business continuity guarantee mechanism is needed.
  • the communication method provided in the embodiment of the present application includes:
  • the network device generates the second configuration of the broadcast-multicast MBS service, the network device sends the second configuration of the broadcast-multicast MBS service to the terminal device, and the terminal device receives the second configuration of the broadcast-multicast MBS service, and the second configuration includes the second configuration.
  • Indication information the second indication information is used to indicate that the broadcast multicast MBS service is configured with service continuity.
  • the embodiment of the present application still uses the SC-PTM transmission technology as an example, but the technical solution of the embodiment of the present application is also applicable to the multi-cell coordinated transmission technology, such as the MBSFN technology, as in the foregoing embodiment.
  • the embodiments of the present application are not only applicable to broadcast and multicast services in LTE systems and LTE-A systems, but also to broadcast and multicast services in NR and future wireless network systems.
  • the cell where the terminal equipment is located can support the use of SC-PTM technology to transmit MBS services.
  • the single-cell multicast data channel SC-MTCH is used to carry the MBS service data of the broadcast multicast service.
  • the SC-MTCH is configured and controlled by the single-cell multicast control channel SC-MCCH.
  • the second configuration may be carried on the SC-MCCH, and the second configuration may be configuration and control information about the SC-MTCH carried by the SC-MCCH logical channel.
  • the second configuration further includes second indication information, and the second indication information is used to indicate that the broadcast-multicast MBS service is configured with service continuity.
  • the second indication information for service continuity indication is for each broadcast-multicast MBS service.
  • the second indication information indicates that the broadcast-multicast MBS service is configured with service continuity, which means that the terminal device moves between cells and enters a new cell. In the cell, it is necessary to adopt a business continuity guarantee mechanism for the MBS service.
  • S802 Receive broadcast-multicast MBS service data according to the second configuration.
  • the terminal device receives the second configuration, and obtains the data of the broadcast-multicast MBS service according to the second configuration. At this time, the terminal equipment is receiving the broadcast multicast MBS service in the original cell.
  • the first configuration and the second configuration in the embodiment of the present application may be the same as the content included in the first configuration in the embodiment of FIG. 2 to FIG. 4, which will not be listed here.
  • the terminal device After acquiring the second configuration, the terminal device further acquires the data of the broadcast and multicast MBS service, and completes the reception of the MBS service.
  • the second configuration further includes a first criterion for triggering random access, and when the first criterion is met, the terminal device initiates random access.
  • the second configuration further includes a first criterion for triggering random access, and the terminal device determines whether the first criterion is satisfied.
  • the terminal device initiates random access to the network device and enters the RRC connected state.
  • a terminal device in an RRC idle state or an RRC inactive state receives a broadcast-multicast MBS service in a cell, and the second configuration of the broadcast-multicast MBS service includes second indication information for indicating the Whether the broadcast multicast MBS service is configured with service continuity.
  • the second indication information indicates that the MBS service is configured with service continuity and the terminal device moves between cells.
  • the service continuity guarantee mechanism in the embodiment of the present application is: the terminal device determines whether the first criterion is met, and if it is met, it enters the RRC connected state. After the terminal device enters the RRC connected state, subsequent actions can be scheduled by the network device.
  • the terminal device since the terminal device needs to enter the RRC connected state, compared to the idle state or inactive state, the terminal device will increase a certain amount of power consumption.
  • the network device needs to schedule the terminal device and also consumes certain system resources. Therefore, in the embodiment of the present application, the second indication information is used to indicate whether the broadcast-multicast MBS service is configured with service continuity.
  • the terminal device receives the MBS service configured with service continuity, and needs to adopt a service continuity guarantee mechanism. If the MBS service received by the terminal device is not configured with service continuity, it does not need to adopt a service continuity guarantee mechanism, thereby saving resources while guaranteeing service continuity.
  • the terminal device receives the second configuration of the broadcast-multicast MBS service in the first cell, and after obtaining the second configuration, obtains the data of the broadcast-multicast MBS service according to the second configuration, and completes the broadcast-multicast MBS service in the first cell ’S reception.
  • the second configuration may include the identification information of the broadcast-multicast MBS service.
  • the identification information of the broadcast-multicast MBS service it can include but is not limited to: Temporary Mobile Group Identity (TMGI), Service Identifier (ID), used to schedule a group of terminal equipment RNTI, such as G -RNTI, it can also be other IE or field, and any information used to indicate this MBS service.
  • TMGI Temporary Mobile Group Identity
  • ID Service Identifier
  • the identification information of the MBS broadcast multicast MBS service is used to identify each MBS service, and the terminal device receives one or more identified MBS services in the first cell. Identify each MBS service through identification information.
  • the second indication information may be a display indication or an implicit indication.
  • an IE or field can be added to the second configuration, and the attribute of the IE or field can be an enumerated type, for example, it can enumerate ⁇ ture/false ⁇ , or it can enumerate ⁇ supported/notSupported ⁇ .
  • True or supported may indicate that the indicated broadcast-multicast MBS service is configured with service continuity
  • false or notSupported may indicate that the indicated broadcast-multicast MBS service is not configured with service continuity.
  • the MBS service can be indicated by mapping the MBS service to a specific radio bearer (radio bearer, RB), such as a specific data radio bearer (DRB) or a multicast radio bearer (MBS point to multipoint radio). bearer, MRB).
  • RB radio bearer
  • the second configuration also includes a first criterion. When the terminal device meets the first criterion, the terminal device initiates random access to the first cell. Then, whether the first criterion is included in the second configuration can be used as an implicit indication manner of the second indication information. When the first criterion is included in the second configuration, it is considered that the broadcast-multicast MBS service configuration has service continuity.
  • the broadcast-multicast MBS service is not configured with service continuity. It should be noted that in the case of display instructions, whether the broadcast-multicast MBS service is configured with business continuity is indicated by the IE or fields or other display instructions listed above, and has nothing to do with whether the second configuration includes the first criterion.
  • the terminal device determines whether the first criterion is met, and the first criterion is met, the terminal device will initiate random access.
  • the first criterion includes judging that the signal quality or channel quality reaches a threshold.
  • Channel quality or signal quality can be the measurement result of terminal equipment, and can include: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal to Interference Ratio (Signal to Interference) At least one of plus noise ratio, SINR) or block error rate (BLER).
  • the signal quality or channel quality reaching the threshold value means that the measurement value of the above-mentioned parameter by the terminal device is equal to or lower than the threshold value. According to the measurement result of the above-mentioned parameter by the terminal device, it is judged that the signal quality or the channel quality is worse than the threshold value.
  • the first criterion may be: the terminal device measures the channel quality or signal quality in the first cell, and when it is determined that the measurement result reaches the threshold, the terminal device initiates random access. Alternatively, the first criterion may be: the signal quality or channel quality reaches the threshold multiple times within the first time period, and the terminal device triggers random access.
  • the first criterion may be: the terminal device triggers random access after the second time period after the signal quality or channel quality measurement result reaches the threshold.
  • the terminal device initiates random access to the network device, and enters the RRC connection state through random access.
  • the network device is a network device that sends a broadcast-multicast MBS service on the first cell.
  • the random access initiated by the terminal device may be a contention-based random access procedure, or a non-contention-based random access procedure.
  • the network device may send the resources required for non-contention random access to the terminal device in the second configuration information.
  • the network device can also send the resources required for non-competitive random access to the terminal device through other information.
  • first information may be sent to the network device, where the first information is used to indicate the reason for initiating random access.
  • the terminal device instructs the network device to initiate random access in order to maintain the continuity of broadcast and multicast MBS service reception during the process of changing cells.
  • the network device After the network device receives the first information, it will be able to learn that the reason why the terminal device initiates random access at this time is to maintain the continuity of the broadcast-multicast MBS service.
  • a display indication method can be adopted, for example, adding an IE or a field. Implicit instructions can also be used for instructions.
  • the second configuration may also include service priority information, that is, the priority corresponding to each broadcast-multicast MBS service.
  • the terminal device may determine whether to request configuration information of the broadcast multicast MBS service from the network device according to the priority information, and the network device may also determine whether to send the broadcast multicast MBS service configuration information to the terminal device according to the priority information.
  • Configuration information may be included in the broadcast multicast MBS service.
  • the network equipment allows the terminal equipment to enter the second cell from the first cell through cell handover (HO), and continues to receive the first configuration of the broadcast-multicast MBS service in the second cell, so it can ensure that the broadcast-multicast MBS service is received Continuity.
  • the first cell sends a handover request to the second cell, and the sent handover request carries broadcast-multicast MBS service information for the MBS service information being received by the terminal equipment of the second cell.
  • the handover request carries progress information of the MBS service, and the progress information indicates the progress of each MBS service in the first cell.
  • the second cell After receiving the handover request, the second cell sends confirmation information of the handover request to the first cell, and the confirmation information may carry the information of the MBS service of the second cell.
  • the information includes which MBS services are supported by the second cell, the progress information of each MBS service, and the configuration information required by the terminal device to receive the MBS service of the second cell.
  • the first cell determines the handover cell for the terminal device as the second cell according to the confirmation information, and can send the configuration information of the MBS service of the second cell to the terminal device and instruct the terminal device to perform handover. In this way, the service continuity of the terminal equipment entering the second cell from the first cell is ensured.
  • the first configuration is the configuration of the MBS service received by the terminal device in the second cell
  • the second configuration is the configuration of the MBS service received by the terminal device in the first cell.
  • the first configuration and the second configuration are configurations of the same MBS service.
  • the first configuration and the second configuration can be the same or different.
  • the second cell can also support the use of SC-PTM technology to transmit MBS services.
  • the first configuration may be carried on the SC-MCCH, and the first configuration may be configuration and control information about the SC-MTCH carried by the SC-MCCH logical channel.
  • the terminal device After obtaining the first configuration, the terminal device then obtains the data of the MBS service carried on the SC-MTCH to complete the reception of the MBS service.
  • the terminal device After acquiring the first configuration in the second cell, the terminal device can determine whether the second criterion is satisfied. When the second criterion is satisfied, the terminal device can return to the RRC idle state or the RRC inactive state.
  • the second criterion configured by the network device for the terminal device may be included in a random access response message, an RRC connection reconfiguration (RRC reconfiguration) or other messages.
  • the terminal device enters the second cell through cell handover, and at this time maintains a connection with the second cell, and the terminal device is in the RRC connected state.
  • the terminal device obtains the first configuration of the broadcast-multicast MBS service, and receives the broadcast-multicast MBS service according to the first configuration.
  • the terminal device can judge whether the second criterion is satisfied in the second cell.
  • the second criterion may include judging that the signal quality or channel quality reaches a threshold, or the second criterion may include a trigger measurement event. Taking the second criterion as an example to determine the signal quality or the channel quality reaching the threshold, the terminal device measures the channel quality or signal quality in the second cell.
  • the channel quality or signal quality may include: Reference Signal Received Power (Reference Signal Received Power, At least one of RSRP, reference signal received quality (RSRQ), signal to interference plus noise ratio (SINR), or block error rate (BLER).
  • the measurement value of the above-mentioned parameter by the terminal device is equal to or higher than the threshold value.
  • the terminal device can return to the RRC idle state or the RRC inactive state, and continue to receive the configuration of the broadcast multicast MBS service in this state.
  • the specific method may include: when the signal quality or channel quality meets the second criterion, the terminal device reports the measurement result to the network device, the network device decides to let the terminal device leave the RRC connection state, and the optional network device can release the RRC connection of the terminal device , So that the terminal device enters the RRC idle state; the network device can also decide to return the terminal device to the original state according to the state before the terminal device enters the connected state.
  • the terminal device after the terminal device determines that the signal quality or channel quality meets the second criterion, it sends a request to the network device to leave the RRC connection state, and the optional terminal device requests the network device to release the RRC connection so that the terminal device enters The RRC idle state; or the network device can request the network device to allow it to return to the original state based on the state before the terminal device enters the connected state; or the network device determines the state of the terminal device after it leaves the RRC connection based on implementation.
  • the embodiments of the present application are also applicable to scenarios where a terminal device moves from one MBSFN area to another MBSFN area.
  • the terminal device receives the broadcast multicast MBS service in the first cell, and judges whether it needs to enter the RRC connected state in the first cell, and enters the RRC connected state to ensure the broadcast multicast MBS service after the cell is changed. Continuity of reception. Since different broadcast and multicast MBS services have different quality requirements, the continuity requirements of the broadcast and multicast MBS services need to be treated differently. Therefore, in the embodiment of the present application, the second configuration of the broadcast-multicast MBS service includes second indication information for indicating whether the broadcast-multicast MBS service needs to ensure service continuity. When the broadcast multicast MBS service received by the terminal device is configured with service continuity, a service continuity guarantee mechanism is adopted. When the broadcast and multicast MBS service received by the terminal device is not configured with service continuity, no service continuity guarantee mechanism is required. The embodiments of the present application can reduce the power consumption of terminal equipment and network equipment while meeting the continuity requirements of the broadcast-multicast MBS service.
  • the first cell and the second cell belong to network equipment.
  • Sending or receiving information for the first cell refers to sending or receiving information by the network device, and sending or receiving information for the second cell refers to sending or receiving information by the network device.
  • the device can use the methods involved in the solutions shown in Figures 2-8.
  • the device is based on the same technical idea. Since the method and the principle of the device to solve the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • the embodiment of the present application also provides a communication device, and the communication device may be a terminal device or a circuit.
  • the communication device can be used to perform the actions performed by the terminal device in the methods in FIGS. 1 to 7 above.
  • the communication device includes: a transceiver module, configured to send a random access message, the random access message includes first indication information, the first indication information is used to request a first configuration of a broadcast-multicast MBS service;
  • the transceiver module is also used to receive the first configuration.
  • the terminal device when the terminal device needs to receive the MBS service, it actively sends a random access message to the network device, and requests the configuration of the MBS service from the network device through the random access message, thereby completing the reception of the MBS service. It has the characteristics of short time delay and flexible MBS service acquisition.
  • the communication device provided in this embodiment can also be used to execute the method in any possible implementation manner of the method embodiments in FIGS. 1-7.
  • the communication device provided in this embodiment can also be used to execute the method in any possible implementation manner of the method embodiments in FIGS. 1-7.
  • the embodiment of the present application also provides a communication device, and the communication device may be a terminal device or a circuit.
  • the communication device can be used to perform the actions performed by the terminal device in the method of FIG. 8 described above.
  • the communication device includes: a transceiver module configured to receive a second configuration of the broadcast/multicast MBS service, and the transceiver module obtains data of the broadcast/multicast MBS service according to the second configuration.
  • the second configuration includes second indication information, and the second indication information is used to indicate that the broadcast-multicast MBS service is configured with service continuity.
  • the second indication information is used to indicate whether the broadcast-multicast MBS service is configured with service continuity.
  • the terminal device receives the MBS service configured with service continuity, and needs to adopt a service continuity guarantee mechanism. If the MBS service received by the terminal device is not configured with service continuity, it does not need to adopt a service continuity guarantee mechanism, thereby saving resources while guaranteeing service continuity.
  • the communication device provided in this embodiment can also be used to execute the method in any possible implementation manner of the method embodiment in FIG. 8.
  • Fig. 9 shows a simplified schematic diagram of the structure of a communication device, which is easy to understand and easy to illustrate.
  • the communication device uses terminal equipment as an example.
  • the communication device includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device.
  • the processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 9 only one memory and processor are shown in FIG. 9. In an actual terminal device product, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.
  • the antenna and radio frequency circuit with the transceiver function may be regarded as the transceiver module of the communication device, and the processor with the processing function may be regarded as the processing module of the communication device.
  • the communication device includes a transceiver module 101 and a processing module 102.
  • the transceiver module may also be called a transceiver, transceiver, transceiver, and so on.
  • the processing module may also be called a processor, a processing board, a processing device, and so on.
  • the device for implementing the receiving function in the transceiver module 101 can be regarded as the receiving module, and the device for implementing the sending function in the transceiver module 101 can be regarded as the sending module, that is, the transceiver module 101 includes a receiving module and a sending module.
  • the transceiver module may sometimes be called a transceiver, a transceiver, or a transceiver circuit.
  • the receiving module may sometimes be called a receiver, a receiver, or a receiving circuit.
  • the sending module can sometimes be called a transmitter, a transmitter, or a transmitting circuit.
  • transceiving module 101 is used to perform the sending and receiving operations on the terminal device side in the foregoing method embodiment
  • processing module 102 is used to perform other operations on the terminal device in the foregoing method embodiment except for the transceiving operation.
  • the transceiver module 101 is used to perform the receiving operations on the terminal device side in S201 and S203 in FIG. 2, and/or the transceiver module 101 is also used to perform other operations on the terminal device side in this embodiment Send and receive steps.
  • the transceiver module 101 is used to perform the receiving operations on the terminal device side in S701, S703, and S704 in FIG. 7, and/or the transceiver module 102 is also used to perform the terminal device in this embodiment of the application.
  • the processing module 102 is configured to execute S702 in FIG. 7, and/or the processing module 102 is also configured to execute other processing steps on the terminal device side in the embodiment of the present application.
  • the transceiver module 101 is used to perform the receiving operations on the terminal device side in S801, S802, and S803 in FIG. Other receiving and sending steps on the side.
  • the processing module 102 is configured to execute other processing steps on the terminal device side in the embodiment of the present application.
  • the chip device may include a transceiver module and a processing module.
  • the transceiver module may be an input/output circuit and/or a communication interface;
  • the processing module is a processor, microprocessor, or integrated circuit integrated on the chip.
  • the device shown in FIG. 10 can be referred to.
  • the device includes a processor 111, a sending data processor 112, and a receiving data processor 113.
  • the processing module in the foregoing embodiment may be the processor 111 in FIG. 10, and completes corresponding functions.
  • the transceiver module in the foregoing embodiment may be the sending data processor 112 and/or the receiving data processor 113 in FIG. 10.
  • the channel encoder and the channel decoder are shown in FIG. 10, it can be understood that these modules do not constitute a restrictive description of this embodiment, and are only illustrative.
  • the processing device 120 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem.
  • the communication device in this embodiment can be used as a modulation subsystem therein.
  • the modulation subsystem may include a processor 123 and an interface 124.
  • the processor 123 completes the function of the above-mentioned processing module, and the interface 124 completes the function of the above-mentioned transceiver module.
  • the modulation subsystem includes a memory 126, a processor 123, and a program stored on the memory 126 and running on the processor.
  • the processor 123 executes the program on the terminal device side in the above method embodiment. Methods.
  • the memory 126 can be non-volatile or volatile, and its location can be located inside the modulation subsystem or in the processing device 120, as long as the memory 126 can be connected to the The processor 123 is sufficient.
  • the embodiment of the present application also provides a communication device, and the communication device may be a network device.
  • the communication device can be used to perform the actions performed by the network device in the methods in FIGS. 1 to 7 above.
  • the communication device includes: a transceiver module, the transceiver module is configured to receive a random access message, the random access message includes first indication information; the transceiver module is also configured to respond to the first indication information to send the first One configuration, the first configuration is a configuration of a broadcast-multicast MBS service.
  • the network device sends the configuration of the MBS service to the terminal device based on the request sent by the terminal device, instead of sending the configuration of the MBS service according to a preset sending cycle. Therefore, the network equipment sending MBS service has the characteristics of short delay and flexible sending.
  • the communication device provided in this embodiment can also be used to execute the method in any possible implementation manner of the method embodiments in Figs. Part of the content of the execution action will not be repeated here.
  • the embodiment of the present application also provides a communication device, and the communication device may be a network device.
  • the communication device may be used to perform the actions performed by the network device in the method embodiment of FIG. 8 described above.
  • the communication device includes: a processing module configured to generate a second configuration of a broadcast-multicast MBS service, and a transceiver module configured to send a second configuration of the broadcast-multicast MBS service, the second configuration including second indication information,
  • the second indication information is used to indicate that the broadcast multicast MBS service is configured with service continuity.
  • the second indication information is used to indicate whether the broadcast-multicast MBS service is configured with service continuity.
  • the terminal device receives the MBS service configured with service continuity, and needs to adopt a service continuity guarantee mechanism. If the MBS service received by the terminal device is not configured with service continuity, it does not need to adopt a service continuity guarantee mechanism, thereby saving resources while guaranteeing service continuity.
  • the communication device provided in this embodiment can also be used to execute the method in any possible implementation manner of the method embodiment in FIG. 8.
  • the device 130 includes one or more radio frequency units, such as a remote radio unit (RRU) 1310 and one or more radio frequency units.
  • the baseband unit 1320 (baseband unit, BBU) may also be called a digital unit (digital unit, DU).
  • the RRU 1310 may be called a transceiver module.
  • the transceiver module may also be called a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 1311 and a radio frequency unit 1312.
  • the RRU 1310 part is mainly used for receiving and sending radio frequency signals and converting radio frequency signals and baseband signals, for example, for sending instruction information to terminal equipment.
  • the 1310 part of the BBU is mainly used for baseband processing, control of the base station, and so on.
  • the RRU 1310 and the BBU 1320 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 1320 is the control center of the base station, and may also be called a processing module, which may correspond to the processing module 820 in FIG. 8, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU processing module
  • the BBU may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.
  • the BBU 1320 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network of a single access standard, or can respectively support radio access networks of different access standards (such as LTE network, 5G network or other networks).
  • the BBU 1320 also includes a memory 1321 and a processor 1322.
  • the memory 1321 is used to store necessary instructions and data.
  • the processor 1322 is used to control the base station to perform necessary actions, for example, used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the memory 1321 and the processor 1322 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.

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Abstract

本申请提供了一种通信方法和通信装置，应用于无线通信技术领域。方法包括：发送随机接入消息，随机接入消息包括第一指示信息，第一指示信息用于请求广播多播MBS业务的第一配置，接收第一配置。终端设备在需要接收MBS业务时，主动向网络设备发送随机接入消息，通过随机接入消息向网络设备请求MBS业务的配置，从而完成MBS业务的接收。终端设备获取MBS业务的时延短并且获取灵活。

Description

一种通信方法及通信装置 技术领域
本申请涉及通信技术领域，特别涉及一种通信方法及通信装置。
背景技术
MBS广播多播业务(multicast broadcast service，MBS)是面向多个终端设备的业务，例如现场直播、定时播放节目等。多播传输技术是指MBS业务通过基站同时向多个终端设备发送的技术。终端设备接收MBS业务通常首先接收多播配置信息，根据配置信息接收MBS业务的数据。MBS业务的配置信息的传输一般具有较长的固定的周期，造成数据传输时延，降低通信质量。
发明内容
本申请实施例提供一种通信方法及通信装置，用于减少MBS业务传输的时延，提高MBS业务的传输灵活性。
第一方面提供一种通信方法，包括：发送随机接入消息，随机接入消息包括第一指示信息，第一指示信息用于请求广播多播MBS业务的第一配置，接收第一配置。
终端设备所在的小区播放一个或多个MBS业务。当终端设备对该一个或多个MBS业务感兴趣，终端设备通过发起随机接入的方式向网络设备发送随机接入消息。该随机接入消息中包括有第一指示信息，用于向网络设备请求第一配置。所述第一配置为终端设备所感兴趣的一个或多个MBS业务的配置。第一配置可以包括：承载于系统信息中的关于多播广播控制信道的配置信息，或者承载于多播广播控制信道上的关于广播多播数据信道的控制和配置信息。第一配置还可以为根据系统信息获取的on demand SI，或者承载于on demand SI上的MBS业务的配置。
本申请实施例，终端设备在需要接收MBS业务时，主动向网络设备发送随机接入消息，通过随机接入消息向网络设备请求MBS业务的配置，从而完成MBS业务的接收。因而，终端设备获取MBS业务的配置的时延短，并且获取灵活。
终端设备发送随机接入消息可以通过随机接入过程实现。随机接入过程可以为四步随机接入过程，终端设备所发送的包括第一指示信息的随机接入消息为四步随机接入过程中的随机接入消息3。或者，随机接入过程可以为两步随机接入过程，终端设备所发送的包括第一指示信息的随机接入消息为两步随机接入过程中的随机接入消息A。终端设备通过随机接入消息3或随机接入消息A主动向网络设备请求MBS业务的第一配置，不必被动等待接收，从而减小MBS业务的传输时延。
在第一方面的一种可能的实现方式中，终端设备在第一小区接收广播多播MBS业务，同时该终端设备由于移动性需求，从第一小区向第二小区移动。终端设备在第一小区接收广播多播MBS业务的第二配置，并通过小区重选进入第二小区。第二小区正在播放或将要播放终端设备正在第一小区接收的MBS业务，终端设备在进入第二小区之后在第二小区发送随机接入消息。
本申请实施例提供的通信方法，终端设备在第一小区接收MBS的配置，在终端设备移动到第二小区之后，终端设备主动发起随机接入过程，向第二小区请求MBS业务的配置。从而无需等待第二小区MBS业务的配置的发送时机，减少由于终端设备的移动带来的接收MBS 业务的时延，增强MBS业务的连续性。
终端设备在第一小区接收广播多播MBS业务的第二配置还可以包括第二指示信息，第二指示信息用于指示广播多播MBS业务配置有业务连续性，终端设备根据业务连续性，发送随机接入消息。配置有业务连续性是指MBS业务有保证业务连续性的需求，业务连续性的需求具体可以是指对于业务中断时间或者是否允许中断的要求，对业务连续性增强的要求等。
通过在第二配置中设置第二指示信息，可以使终端设备在移动到第二小区以后，根据第二指示信息的指示以更灵活的方式接收MBS业务及其配置信息。终端设备在第二小区只需要向网络设备请求需要保障业务连续性的MBS业务的配置，终端设备不需要请求第二小区内其他的MBS业务的配置。
第二指示信息可以采用显示指示的方式，也可以是隐式指示。对于显示指示，可以在第二配置中新增IE或字段。
终端设备接收的MBS业务的第二配置中可以包括广播多播MBS业务的标识信息。广播多播MBS业务的标识信息用于对每个MBS业务进行标识。终端设备在第一小区接收一个或多个带有标识的MBS业务，通过标识信息对每个MBS业务进行识别。
第二配置可以包括业务优先级信息，也就是每个广播多播MBS业务所对应的优先级。所述终端设备可以根据所述优先级信息决定是否向网络设备请求此广播多播MBS业务的配置信息，网络设备也可以根据所述优先级信息决定是否向终端设备发送此广播多播MBS业务的配置信息。
在第一方面的一种可能的实现方式中，终端设备驻留于第二小区，首先接收第二小区的系统信息，根据系统信息确定是否发送随机接入消息。系统信息承载MBS业务的配置的修改周期、重复周期以及无线帧偏置等。终端设备根据接收到的系统信息，能够获知第二小区发送下一个MBS业务的配置的时间，从而终端设备决定是否向第二小区发送随机接入消息，请求MBS的配置。
终端设备根据系统信息确定是否发送随机接入消息的过程可以包括：第二小区发送广播多播MBS业务的第三配置，根据系统信息确定接收所述第三配置的时间，确认接收第三配置的时间晚于或等于接收第一配置的时间，发送随机接入消息。将网络设备按照第二小区内的MBS业务固有的发送周期发送的配置称之MBS业务的第三配置。第三配置和第一配置的内容可以是相同的，或者第三配置的内容包括第一配置的内容。
终端设备通过比较接收第一配置的时间和接收第三配置的时间，能够以更短的时间获取到MBS业务的配置，从而提升终端设备在小区间移动过程中接收MBS业务的连续性，提升通信质量。
发送随机接入消息的终端设备处于RRC空闲态或RRC非激活态。
第二方面提供一种通信方法，包括：接收随机接入消息，随机接入消息包括第一指示信息，响应于第一指示信息发送第一配置，第一配置为广播多播MBS业务的配置。
网络设备向终端设备所在的小区播放一个或多个MBS业务，终端设备通过发起随机接入的方式向网络设备发送随机接入消息。该随机接入消息中包括有第一指示信息，用于向网络设备请求第一配置。第一配置为终端设备所感兴趣的一个或多个MBS业务的配置。网络设备响应于第一指示信息向终端设备发送第一配置，终端设备根据第一配置获取MBS业务。
本申请实施例，网络设备基于终端设备发送的请求，向终端设备发送MBS业务的配置，而不必按照预设的发送周期发送MBS业务的配置。因而，网络设备发送MBS业务具有时延短，发送灵活的特点。
终端设备发送随机接入消息可以通过随机接入过程实现。同样，网络设备发送第一配置可以通过随机接入过程实现。随机接入过程可以为四步随机接入过程，终端设备所发送的包括第一指示信息的随机接入消息为四步随机接入过程中的随机接入消息3，网络设备通过随机接入消息4发送所述第一配置。或者，随机接入过程可以为两步随机接入过程，终端设备所发送的包括第一指示信息的随机接入消息为两步随机接入过程中的随机接入消息A，网络设备通过随机接入消息B发送所述第一配置。
在第二方面的一种可能的实现方式中，网络设备向终端设备发送广播多播MBS业务的第三配置，并且网络设备发送系统信息，系统信息包括第三配置的发送周期和偏置。第三配置是指网络设备按照MBS业务固有的发送周期发送的配置。网络设备在发送第三配置之前，先发送系统信息。系统信息中包括有网络设备正在或即将发送的广播多播MBS业务的配置的发送周期和偏置。根据MBS业务的配置的发送周期和偏置可以确定网络设备发送第三配置的时间。第三配置是网络设备根据协议预定周期发送的，第一配置是网络设备根据终端设备的请求发送的。网络设备发送的系统信息中所包括的MBS业务的配置的发送周期和偏置可以使终端设备获知网络设备发送第三配置的时间，从而有助于终端设备判断是否向网络设备发送第一指示信息。
第三方面提供一种通信方法，包括：终端设备接收广播多播MBS业务的第二配置，终端设备根据第二配置获取广播多播MBS业务的数据。第二配置包括第二指示信息，所述第二指示信息用于指示所述广播多播MBS业务配置有业务连续性。第二指示信息对于业务连续性的指示是针对于每个广播多播MBS业务而言，第二指示信息指示该广播多播MBS业务配置有业务连续性，则说明终端设备在小区间移动进入新小区时，需要对该MBS业务采用业务连续性保障机制。
第二配置可以包括：承载于系统信息中的关于多播广播控制信道的配置信息，承载于多播广播控制信道上的关于广播多播数据信道的控制和配置信息。第二配置还可以为根据系统信息获取的on demand SI，或承载于on demand SI上的MBS业务的配置。
所述第二配置还包括触发随机接入的第一准则，终端设备对是否满足第一准则进行判定。当满足第一准则，终端设备向网络设备发起随机接入，进入RRC连接态。
本申请实施例中，通过采用第二指示信息的方式，指示广播多播MBS业务是否配置有业务连续性。终端设备接收了配置有业务连续性的MBS业务，需要采取业务连续性保障机制。终端设备接收的MBS业务如果没有配置有业务连续性，则不需要采取业务连续性保障机制，从而在保障业务连续性的同时节约资源。
第二指示信息可以采用显示指示的方式，也可以是隐式指示。对于显示指示，可以在第二配置中新增IE或字段。对于隐式指示，可以通过将该MBS业务映射到无线承载(radio bearer，RB)等来指示。
第一准则可以为：终端设备在第一小区内对信道质量或信号质量进行测量，当确定测量结果达到阈值，终端设备发起随机接入。或者，第一准则可以为：第一时间段内信号质量或信道质量多次达到阈值，终端设备触发随机接入。或者，第一准则可以为：终端设备在信号质量或信道质量的测量结果达到阈值后的第二时间段之后触发随机接入。
第二配置可以包括业务优先级信息，也就是每个广播多播MBS业务所对应的优先级。所述终端设备可以根据所述优先级信息决定是否向网络设备请求此广播多播MBS业务的配置信息，网络设备也可以根据所述优先级信息决定是否向终端设备发送此广播多播MBS业务的配置信息。
在第三方面的一种可能的实现方式中，终端设备接收第一小区内的第二配置，在第一小区完成随机接入，由第一小区切换到第二小区，并接收第二小区内的广播多播MBS业务的第一配置。第一配置是终端设备接收的第二小区的MBS业务的配置，第二配置是终端设备接收的第一小区的MBS业务的配置。第一配置和第二配置是同一个MBS业务的配置。第一配置和第二配置可以相同，也可以不同。
终端设备在第一小区进入RRC连接态，后续行为由网络设备进行调度。网络设备通过小区切换(handover，HO)使终端设备从第一小区进入第二小区，并在第二小区继续接收该广播多播MBS业务的第一配置，因此可以保证广播多播MBS业务接收的连续性。
终端设备在第二小区获取到第一配置之后，可以对是否满足第二准则进行判断。当满足第二准则，终端设备可以回到RRC空闲态或RRC非激活态。第二准则可以是网络设备为终端设备而配置的。所述第二准则可以被包含于随机接入响应消息，RRC连接重配置(RRC reconfiguration)或者其他消息中。
终端设备接收的MBS业务的第二配置中可以包括广播多播MBS业务的标识信息。广播多播MBS业务的标识信息用于对每个MBS业务进行标识。终端设备在第一小区接收一个或多个带有标识的MBS业务，通过标识信息对每个MBS业务进行识别。
在第三方面的一种可能的实现方式中，在终端设备发起随机接入的过程中，可以向网络设备发送第一信息，第一信息用于指示发起随机接入的原因。网络设备接收第一信息后，将能够获知终端设备此时发起随机接入的原因是为了保持广播多播MBS业务的连续性。
第四方面提供一种通信方法，包括：生成广播多播MBS业务的第二配置，发送广播多播MBS业务的第二配置，第二配置包括第二指示信息，所述第二指示信息用于指示所述广播多播MBS业务配置有业务连续性。
第二指示信息对于业务连续性的指示是针对于每个广播多播MBS业务而言，第二指示信息指示该广播多播MBS业务配置有业务连续性，则说明终端设备在小区间移动进入新小区时，需要对该MBS业务采用业务连续性保障机制。
第二配置可以包括：承载于系统信息中的关于多播广播控制信道的配置信息，承载于多播广播控制信道上的关于广播多播数据信道的控制和配置信息。第二配置还可以为根据系统信息获取的on demand SI，或者承载于on demand SI上的MBS业务的配置。
第二配置还包括触发随机接入的第一准则，第一准则用于触发终端设备随机接入。第一准则可以为：终端设备在第一小区内对信道质量或信号质量进行测量，当确定测量结果达到阈值，终端设备发起随机接入。或者，第一准则可以为：第一时间段内信号质量或信道质量多次达到阈值，终端设备触发随机接入。或者，第一准则可以为：终端设备在信号质量或信道质量的测量结果达到阈值后的第二时间段之后触发随机接入。
本申请实施例中，通过采用第二指示信息的方式，指示广播多播MBS业务是否配置有业务连续性。终端设备接收了配置有业务连续性的MBS业务，需要采取业务连续性保障机制。终端设备接收的MBS业务如果没有配置有业务连续性，则不需要采取业务连续性保障机制，从而在保障业务连续性的同时节约资源。
第二配置可以包括业务优先级信息，也就是每个广播多播MBS业务所对应的优先级。所述终端设备可以根据所述优先级信息决定是否向网络设备请求此广播多播MBS业务的配置信息，网络设备也可以根据所述优先级信息决定是否向终端设备发送此广播多播MBS业务的配置信息。
在第四方面的一种可能的实现方式中，第一小区发送广播多播MBS业务的第二配置。终 端设备完成随机接入后，终端设备从第一小区切换到第二小区。在切换过程中，第一小区接收切换确认信息，切换确认信息包括第二小区内的MBS业务的信息。第二小区内的MBS业务的信息可以包括：第二小区支持的MBS业务，MBS业务的进度信息，以及MBS业务的配置信息。在切换过程中，第一小区可以根据切换确认信息为终端设备确定切换小区为第二小区，并可以将第二小区的MBS业务的配置信息发送给终端设备，并指示终端设备进行切换。
在第四方面的一种可能的实现方式中，在随机接入的过程中，网络设备接收第一信息，第一信息用于指示发起随机接入的原因。网络设备根据接收的第一信息，将能够获知终端设备此时发起随机接入的原因是为了保持广播多播MBS业务的连续性。
第五方面提供一种通信装置，该通信装置可以为终端设备。包括：发送模块，用于发送随机接入消息，所述随机接入消息包括第一指示信息，所述第一指示信息用于请求广播多播MBS业务的第一配置；接收模块，用于接收所述第一配置。
终端设备所在的小区播放一个或多个MBS业务。当终端设备对该一个或多个MBS业务感兴趣，终端设备通过发起随机接入的方式向网络设备发送随机接入消息。该随机接入消息中包括有第一指示信息，用于向网络设备请求第一配置，第一配置为终端设备所感兴趣的一个或多个MBS业务的配置。第一配置可以包括：承载于系统信息中的关于多播广播控制信道的配置信息，承载于多播广播控制信道上的关于广播多播数据信道的控制和配置信息。第一配置还可以为根据系统信息获取的on demand SI，承载于on demand SI上的MBS业务的配置。
本申请实施例，终端设备在需要接收MBS业务时，主动向网络设备发送随机接入消息，通过随机接入消息向网络设备请求MBS业务的配置，从而完成MBS业务的接收。具有时延短，MBS业务获取灵活的特点。
终端设备发送随机接入消息可以通过随机接入过程实现，随机接入过程可以为四步随机接入过程，终端设备所发送的包括第一指示信息的随机接入消息为四步随机接入过程中的随机接入消息3。或者，随机接入过程可以为两步随机接入过程，终端设备所发送的包括第一指示信息的随机接入消息为两步随机接入过程中的随机接入消息A。终端设备通过随机接入消息3或随机接入消息A主动向网络设备请求MBS业务的第一配置，不必被动等待接收，从而减小MBS业务的传输时延。
在第五方面的一种可能的实现方式中，终端设备接收第一小区的广播多播MBS业务，同时该终端设备由于移动性需求，从第一小区向第二小区移动。终端设备的接收模块用于在第一小区接收广播多播MBS业务的第二配置，处理模块用于选择第二小区作为通信装置的驻留小区。第二小区在播放或将要播放终端设备正在第一小区接收的MBS业务，终端设备在进入第二小区之后在第二小区发送随机接入消息。
本申请实施例提供的通信装置，终端设备接收第一小区的MBS的配置，在终端设备移动到第二小区之后，终端设备主动发起随机接入过程，向第二小区请求MBS业务的配置。从而无需等待第二小区多播业务MBS业务的配置的发送时机，减少由于终端设备的移动带来的接收MBS业务的时延，增强MBS业务的连续性。
终端设备在第一小区接收广播多播MBS业务的第二配置还可以包括第二指示信息，第二指示信息用于指示广播多播MBS业务配置有业务连续性，终端设备根据业务连续性，发送随机接入消息。配置有业务连续性是指MBS业务有保证业务连续性的需求，业务连续性的需求具体可以是指对于业务中断时间或者是否允许中断的要求，对业务连续性增强的要求等，根据业务连续性发送随机接入消息。
通过在第二配置中设置第二指示信息，可以使终端设备在移动到第二小区以后，根据第 二指示信息的指示以更灵活的方式接收MBS业务及其配置信息。终端设备在第二小区只需要向网络设备请求需要保障业务连续性的MBS业务的配置，第二小区内其他的MBS业务的配置不需要请求。
第二指示信息可以采用显示指示的方式，也可以是隐式指示。对于显示指示，可以在第二配置中新增IE或字段。
终端设备接收的MBS业务的第二配置中还可以包括广播多播MBS业务的标识信息。广播多播MBS业务的标识信息用于对每个MBS业务进行标识，终端设备在第一小区接收一个或多个带有标识的MBS业务。通过标识信息对每个MBS业务进行识别。
第二配置可以包括业务优先级信息，也就是每个广播多播MBS业务所对应的优先级。所述终端设备可以根据所述优先级信息决定是否向网络设备请求此广播多播MBS业务的配置信息，网络设备也可以根据所述优先级信息决定是否向终端设备发送此广播多播MBS业务的配置信息。
在第五方面的一种可能的实现方式中，终端设备驻留于第二小区，首先接收第二小区的系统信息，根据系统信息确定是否发送随机接入消息。系统信息承载MBS业务的配置的修改周期、重复周期以及无线帧偏置等。终端设备根据接收到的系统信息，能够获知第二小区发送下一个MBS业务的配置的时间，从而终端设备决定是否向第二小区发送随机接入消息，请求MBS的配置。
终端设备根据系统信息确定是否发送随机接入消息的过程可以为：第二小区发送广播多播MBS业务的第三配置，根据系统信息确定接收所述第三配置的时间，确认接收第三配置的时间晚于或等于接收第一配置的时间，发送随机接入消息。将网络设备按照第二小区内的MBS业务固有的发送周期发送的配置称之MBS业务的第三配置。第三配置和第一配置的内容可以是相同的，或者第三配置的内容包括第一配置的内容。
终端设备通过比较接收第一配置的时间和接收第三配置的时间，能够以更短的时间获取到MBS业务的配置，从而提升终端设备在小区间移动过程中接收MBS业务的连续性，提升通信质量。
终端设备处于RRC空闲态或RRC非激活态。
第六方面提供一种通信装置，该通信装置可以为网络设备，包括：接收模块，所述接收模块用于接收随机接入消息，所述随机接入消息包括第一指示信息；发送模块，用于响应所述第一指示信息发送第一配置，所述第一配置为广播多播MBS业务的配置。
网络设备向终端设备所在的小区播放一个或多个MBS业务，终端设备通过发起随机接入的方式向网络设备发送随机接入消息。该随机接入消息中包括有第一指示信息，用于向网络设备请求第一配置，第一配置为终端设备所感兴趣的一个或多个MBS业务的配置。网络设备响应于第一指示信息向终端设备发送第一配置，终端设备根据第一配置获取MBS业务。
本申请实施例，网络设备基于终端设备发送的请求，向终端设备发送MBS业务的配置，而不必按照预设的发送周期发送MBS业务的配置。因而，网络设备发送MBS业务具有时延短，发送灵活的特点。
终端设备发送随机接入消息可以通过随机接入过程实现，同样网络设备发送第一配置可以通过随机接入过程实现。随机接入过程可以为四步随机接入过程，终端设备所发送的包括第一指示信息的随机接入消息为四步随机接入过程中的随机接入消息3，网络设备通过随机接入消息4发送所述第一配置。或者，随机接入过程可以为两步随机接入过程，终端设备所发送的包括第一指示信息的随机接入消息为两步随机接入过程中的随机接入消息A，通过随 机接入消息B发送所述第一配置。
在第六方面的一种可能的实现方式中，网络设备向终端设备发送广播多播MBS业务的第三配置，并且网络设备发送系统信息，系统信息包括第三配置的发送周期和偏置。第三配置是指网络设备按照MBS业务固有的发送周期发送的配置。网络设备在发送第三配置之前，先发送系统信息，系统信息中包括有网络设备正在或即将发送的广播多播MBS业务的配置的发送周期和偏置。根据MBS业务的配置的发送周期和偏置可以确定网络设备发送第三配置的时间。第三配置是网络设备根据协议预定周期发送的，第一配置是网络设备根据终端设备的请求发送的。网络设备发送的系统信息中所包括的MBS业务的配置的发送周期和偏置可以使终端设备获知网络设备发送第三配置的时间，从而有助于终端设备判断是否向网络设备发送第一指示信息。
第七方面提供一种通信装置，该通信装置可以为终端设备，包括：接收模块，用于接收广播多播MBS业务的第二配置，接收模块根据第二配置获取广播多播MBS业务的数据。第二配置包括第二指示信息，所述第二指示信息用于指示所述广播多播MBS业务配置有业务连续性。第二指示信息对于业务连续性的指示是针对于每个广播多播MBS业务而言，第二指示信息指示该广播多播MBS业务配置有业务连续性，则说明终端设备在小区间移动进入新小区时，需要对该MBS业务采用业务连续性保障机制。
第二配置可以包括：承载于系统信息中的关于多播广播控制信道的配置信息，承载于多播广播控制信道上的关于广播多播数据信道的控制和配置信息。第二配置还可以为根据系统信息获取的on demand SI，或承载于on demand SI上的MBS业务的配置。
所述第二配置还包括触发随机接入的第一准则，终端设备对是否满足第一准则进行判定。当满足第一准则，终端设备向网络设备发起随机接入，进入RRC连接态。
本申请实施例中，通过采用第二指示信息的方式，指示广播多播MBS业务是否配置有业务连续性。终端设备接收了配置有业务连续性的MBS业务，需要采取业务连续性保障机制。终端设备接收的MBS业务如果没有配置有业务连续性，则不需要采取业务连续性保障机制，从而在保障业务连续性的同时节约资源。
第二指示信息可以采用显示指示的方式，也可以是隐式指示。对于显示指示，可以在第二配置中新增IE或字段。对于隐式指示，可以通过将该MBS业务映射到特定无线承载(radio bearer，RB)等来指示。
第一准则可以为：终端设备在第一小区内对信道质量或信号质量进行测量，当确定测量结果达到阈值，终端设备发起随机接入。或者，第一准则可以为：第一时间段内信号质量或信道质量多次达到阈值，终端设备触发随机接入。或者，第一准则可以为：终端设备在信号质量或信道质量的测量结果达到阈值后的第二时间段之后触发随机接入。
第二配置可以包括业务优先级信息，也就是每个广播多播MBS业务所对应的优先级。所述终端设备可以根据所述优先级信息决定是否向网络设备请求此广播多播MBS业务的配置信息，网络设备也可以根据所述优先级信息决定是否向终端设备发送此广播多播MBS业务的配置信息。
在第七方面的一种可能的实现方式中，终端设备接收第一小区内的第二配置，终端设备完成随机接入后，由第一小区切换到第二小区，并接收第二小区内的广播多播MBS业务的第一配置。第一配置是终端设备接收的第二小区的MBS业务的配置，第二配置是终端设备接收的第一小区的MBS业务的配置。第一配置和第二配置是同一个MBS业务的配置。第一配置和第二配置可以相同，也可以不同。
终端设备在第一小区进入RRC连接态以后，后续行为由网络设备进行调度。网络设备通过小区切换(handover，HO)使终端设备从第一小区进入第二小区，并在第二小区继续接收该广播多播MBS业务的第一配置，因此可以保证广播多播MBS业务接收的连续性。
终端设备还包括处理模块，在第二小区获取到第一配置之后，处理模块可以对是否满足第二准则进行判断，当满足第二准则，终端设备可以回到RRC空闲态或RRC非激活态。第二准则可以是网络设备为终端设备而配置的。所述第二准则可以被包含于随机接入响应消息，RRC连接重配置(RRC reconfiguration)或者其他消息中。
终端设备接收的MBS业务的第二配置中还可以包括广播多播MBS业务的标识信息。广播多播MBS业务的标识信息用于对每个MBS业务进行标识，终端设备在第一小区接收一个或多个带有标识的MBS业务。通过标识信息对每个MBS业务进行识别。在第七方面的一种可能的实现方式中，在终端设备发起随机接入的过程中，收发模块可以向网络设备发送第一信息，第一信息用于指示发起随机接入的原因。网络设备根据接收的第一信息，将能够获知终端设备此时发起随机接入的原因是为了保持广播多播MBS业务的连续性。
第八方面提供一种通信装置，该通信装置可以为网络设备，包括：处理模块，用于生成广播多播MBS业务的第二配置，发送模块，用于发送广播多播MBS业务的第二配置，第二配置包括第二指示信息，所述第二指示信息用于指示所述广播多播MBS业务配置有业务连续性。
第二指示信息对于业务连续性的指示是针对于每个广播多播MBS业务而言，第二指示信息指示该广播多播MBS业务配置有业务连续性，则说明终端设备在小区间移动进入新小区时，需要对该MBS业务采用业务连续性保障机制。
第二配置可以包括：承载于系统信息中的关于多播广播控制信道的配置信息，承载于多播广播控制信道上的关于广播多播数据信道的控制和配置信息。第二配置还可以为根据系统信息获取的on demand SI，或承载于on demand SI上的MBS业务的配置。
第二配置还包括触发随机接入的第一准则，第一准则用于触发终端设备随机接入。第一准则可以为：终端设备在第一小区内对信道质量或信号质量进行测量，当确定测量结果达到阈值，终端设备发起随机接入。或者，第一准则可以为：第一时间段内信号质量或信道质量多次达到阈值，终端设备触发随机接入。或者，第一准则可以为：终端设备在信号质量或信道质量的测量结果达到阈值后的第二时间段之后触发随机接入。
第二配置可以包括业务优先级信息，也就是每个广播多播MBS业务所对应的优先级。所述终端设备可以根据所述优先级信息决定是否向网络设备请求此广播多播MBS业务的配置信息，网络设备也可以根据所述优先级信息决定是否向终端设备发送此广播多播MBS业务的配置信息。
本申请实施例中，通过采用第二指示信息的方式，指示广播多播MBS业务是否配置有业务连续性。终端设备接收了配置有业务连续性的MBS业务，需要采取业务连续性保障机制。终端设备接收的MBS业务如果没有配置有业务连续性，则不需要采取业务连续性保障机制，从而在保障业务连续性的同时节约资源。
第九方面提供一种通信装置，包括收发器和处理器，所述收发器用于执行接收和发送信息的指令，所述处理器用于执行其他步骤。具体地，所述通信装置用于执行第一方面或第三方面的任一可能的实现方式的方法。
第十方面提供一种通信装置，包括收发器和处理器，所述收发器用于执行接收和发送信息的指令，所述处理器用于执行其他步骤。具体地，所述通信装置用于执行第二方面或第四 方面的任一可能的实现方式的方法。
第十一方面提供一种计算机可读存储介质，其上存储有计算机程序，所述程序被处理器执行实现第一方面或第三方面的任一可能的实现方式中的方法。
第十二方面提供一种计算机可读存储介质，其上存储有计算机程序，所述程序被处理器执行实现第二方面或第四方面的任一可能的实现方式中的方法
第十三方面提供一种通信系统，包括第五方面所述的通信装置和第六方面所述的通信装置，或者包括第七方面所述的通信装置和第八方面所述的通信装置。
第十四方面提供一种终端设备，所述终端设备包括存储器和处理器，所述存储器用于存储指令，所述处理器用于执行所述存储器存储的指令，并且对所述存储器中存储的指令的执行使得所述处理器执行第一方面或第三方面的任一可能的实现方式中的方法。
第十五方面提供一种网络设备，所述网络设备包括存储器和处理器，所述存储器用于存储指令，所述处理器用于执行所述存储器存储的指令，并且对所述存储器中存储的指令的执行使得所述处理器执行第二方面或第四方面的任一可能的实现方式中的方法。
第十六方面提供一种包含指令的计算机程序产品，所述计算机程序产品用于存储计算机程序，当所述计算机程序在计算机上运行时，使得所述计算机执行上述第一方面或第三方面的任一可能的实现方式中的方法。
第十七方面提供一种包含指令的计算机程序产品，所述计算机程序产品用于存储计算机程序，当所述计算机程序在计算机上运行时，使得所述计算机执行上述第二方面或第四方面的任一可能的实现方式中的方法。
附图说明
图1是适用于本申请实施例的通信方法的通信系统的示意图。
图2是本申请实施例提供的一种通信方法的流程图；
图3是本申请实施例示出的四步随机接入过程的示意图；
图4是本申请实施例示出的两步随机接入过程的示意图；
图5是本申请实施例提供一种终端设备在从第一小区向第二小区移动的示意图；
图6是本申请实施例提供的SC-PTM传输技术中SC-MCCH和SC-MTCH发送周期示意图；
图7是本申请实施例提供的另一种通信方法的流程图；
图8是本申请实施例提供的另一种通信方法的流程图；
图9是本申请实施例提供的通信装置的结构示意图；
图10是本申请实施例提供的通信装置的又一种结构示意图；
图11是本申请实施例提供的通信装置的又一种结构示意图；
图12是本申请实施例提供的通信装置的又一种结构示意图。
具体实施方式
为了使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施例作进一步地详细描述。
以下，对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
1、本申请涉及的终端设备，包括向用户提供语音的设备，向用户提供数据连通性的设备，向用户提供语音和数据连通性的设备。例如可以包括具有无线连接功能的手持式设备、或连接到无线调制解调器的处理设备。也可以简称为终端。该终端可以经无线接入网(radio access  network，RAN)与核心网进行通信，与RAN交换语音或数据，或与RAN交互语音和数据。该终端可以包括用户设备(user equipment，UE)、无线终端、移动终端、设备到设备通信(device-to-device，D2D)终端、车到一切(vehicle to everything，V2X)终端、机器到机器/机器类通信(machine-to-machine/machine-type communications，M2M/MTC)终端、物联网(internet of things，IoT)终端、订户单元(subscriber unit)、订户站(subscriber station)，移动站(mobile station)、远程站(remote station)、接入点(access point，AP)、远程终端(remote terminal)、接入终端(access terminal)、用户终端(user terminal)、用户代理(user agent)、或用户装备(user device)等。可以包括移动电话(或称为“蜂窝”电话)，具有移动终端的计算机，便携式、袖珍式、手持式、计算机内置的移动装置等。可以包括个人通信业务(personal communication service，PCS)电话、无绳电话、会话发起协议(session initiation protocol，SIP)话机、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、等设备。还包括受限设备，功耗较低的设备，或存储能力有限的设备，或计算能力有限的设备等。可以包括条码、射频识别(radio frequency identification，RFID)、传感器、全球定位系统(global positioning system，GPS)、激光扫描器等信息传感设备。
作为示例而非限定，在本申请实施例中，该终端还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备或智能穿戴式设备等，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能头盔、智能首饰等。
而如上介绍的各种终端，如果位于车辆上，例如放置在车辆内或安装在车辆内，都可以认为是车载终端，车载终端例如也称为车载单元(on-board unit，OBU)。
本申请实施例中，用于实现终端的功能的装置可以是终端，也可以是能够支持终端实现该功能的电路，例如可以被应用于芯片系统的电路，该芯片系统可以被安装在终端中。本申请实施例中，芯片系统可以由芯片构成，也可以包括芯片和其他分立器件。本申请实施例提供的技术方案中，以用于实现终端的功能的装置是终端为例，描述本申请实施例提供的技术方案。
2、本申请所涉及的网络设备，可以包括无线接入网(radio access network，RAN)设备，例如基站(例如，接入点)。可以是指接入网中通过空中接口与终端设备通信的设备，或者一种车到一切(vehicle-to-everything，V2X)技术中的网络设备为路侧单元(road side unit，RSU)。基站可用于将收到的空中帧与IP分组进行相互转换，作为终端与接入网的其余部分之间的路由器，其中接入网的其余部分可包括IP网络。RSU可以是支持V2X应用的固定基础设施实体，与支持V2X应用的其他实体交换消息。网络设备还可协调对空中接口的属性管理。例如，网络设备可以包括长期演进(long term evolution，LTE)系统或高级长期演进(long term evolution-advanced，LTE-A)中的演进型基站(NodeB或eNB或e-NodeB，evolutional Node B)，或者也可以包括演进的分组核心网络(evolved packet core，EPC)、第五代通信技术(the 5th generation，5G)、新空口(new radio，NR)系统(也简称为NR系统)中的下一代节点B(next generation node B，gNB)或者包括云接入网(cloud radio access network，Cloud RAN)系统中的集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)，本申请实施例 并不限定。
网络设备还可以包括核心网设备，核心网设备例如包括访问和移动管理功能(access and mobility management function，AMF)等。
3、广播多播业务(multicast broadcast service，MBS)
在NR系统中，MBS称为广播多播业务，是用于实现从数据业务源向特定范围内多个用户同时传送某类内容的数据业务的一种点到多点业务。通过使用较少的网络资源为大量具有相同需求的用户同时提供业务(如：多媒体业务等)，从而减少对网络资源的占用。
多媒体广播多播业务(Multimedia Broadcast Multicast Service，MBMS)是3GPP R6中定义的多媒体广播组播功能。MBMS支持多媒体广播业务和组播业务两种模式，既可以将多媒体视频信息直接向所有用户广播，也可以发送给一组收费的签约用户收看，可以帮助运营商开展多媒体广告、免费和收费电视频道、彩信群发等多种商业应用，运营商以较低的网络部署成本就可开展手机电视业务。
eMBMS是长期演进(Long Term Evolution，LTE)网络上的增强型广播多播技术，是移动领域的视频承载技术之一。与上一代MBMS视频承载技术相比，可以使运营商显著降低在LTE网络上同一时间向多个用户提供诸如视频、音频等高带宽内容的成本。与上一代MBMS视频承载技术相比，eMBMS技术能支持更大的带宽，这意味着能提供更多的频道和视频内容，同时视频画面更清晰流畅，用户体验更好。
下文中，MBMS和LTE中的eMBMS以及NR中的MBS统称为MBS。MBS包括两种传输技术：多小区协同传输技术和单小区传输技术。其中多小区协同传输技术包括多媒体广播多播单频网技术(Multimedia Broadcast multicast service Single Frequency Network，MBSFN)，单小区传输技术包括单小区点到多点传输技术(Single-Cell Point-to-Multipoint，SC-PTM)。
MBS业务的接收和发送可能涉及以下三种形式中的任一种：
形式一：MBS可能存在多播逻辑信道：MBS业务控制信道(Multi-cast Control Channel，MCCH)和MBS数据信道(Multicast Traffic Channel，MTCH)。终端设备接收网络设备发送的系统信息(system information，SI)，SI中包括终端设备获取多播业务控制信息所需的信息，比如MCCH的配置信息。终端设备在获取到该配置信息之后，根据该配置信息对MCCH进行监听，获取用于MBS服务的控制信息，比如MTCH的配置信息。终端设备根据MTCH的配置信息对MTCH信道进行监听，从而获取MBS业务的数据。
形式二：终端设备接收网络设备发送的SI，终端设备根据SI获取按需系统信息(on demand SI)。on demand SI上承载有MBS业务的配置信息，终端设备根据该配置信息获取MBS业务的数据。
形式三：终端设备获取网络设备在小区内广播的MBS业务的配置信息，MBS业务的配置信息小区内所有的终端设备都可以接收。终端设备根据接收到的MBS业务的配置信息获取MBS业务的数据。
4、SC-PTM
SC-PTM是一种广播多播传输技术，此技术增强了空口的性能，能提高无线电效率并减少时延。SC-PTM支持单个小区的广播多播服务，并且可以根据用户的分布逐个小区动态调整广播多播区域。在LTE系统中，SC-PTM使用LTE物理下行链路共享信道(Physical Downlink shared channel，PDSCH)传输广播多播服务，并使用公共无线网络临时标识(Group-Radio Network Temporary Identifier，G-RNTI)为一组用户进行调度。SC-PTM特别适用于以下情形： 由于用户兴趣，广播多播服务预计将传递到一些小区，并且相关小区可能由于用户移动而动态变化。SC-PTM可以有效地利用无线电并灵活部署许多应用程序，例如关键通信，汽车交通信息和点播电视服务等。
SC-PTM技术实现MBS业务的接收同样可以采用上述三种形式，以形式一为例介绍SC-PTM技术中MBS业务获取的过程。SC-PTM技术中存在一个单小区多播控制信道(Single Cell Multi-cast Control Channel，SC-MCCH)，SC-MCCH携带SC-PTM配置消息。该配置消息指示正在进行的MBS会话以及有关何时可以调度每个会话的信息，如调度周期(scheduling period)、调度窗口(scheduling window)和起始偏移量(start offset)。SC-PTM配置消息还提供相邻小区是否发送MBS会话的信息。SC-MCCH是映射到PDSCH上，所以SC-PTM业务的控制信息在物理下行控制信道(Physical downlink control channel，PDCCH)上进行调度。
另外，系统信息提供了SC-PTM控制信息，这些控制信息主要是获取SC-MCCH所需的信息。SC-MCCH信息的发送使用可配置的重复周期，进行定期发送。所以，SC-MCCH是以一定周期重复的在进行MBS业务的小区中广播。如在系统信息块20(System Information Block Type 20，SIB20)中对监听SC-MCCH的时域资源进行了配置，具体配置参数包括：SC-MCCH的周期和偏移量，SC-MCCH周期性出现的边界，SC-MCCH调度的第一个子帧，已经从第一个子帧开始的调度SC-MCCH的持续时间。
SC-PTM技术中还存在一个单小区多播数据信道(Single Cell Multicast Traffic Channel，SC-MTCH)，SC-MTCH同样映射到PDSCH上。SC-MTCH用来传输SC-PTM业务的业务数据。
5、无线网络临时标识(Radio Network Temporary Identifier，RNTI)
RNTI是网络分配终端设备，用于标示不同终端设备的。按照功能的不同，划分了多种RNTI。每个终端设备可以同时对应多个RNTI，不同种类的RNTI所针对的场景是不同的，但是RNTI的工作原理却都是一样的，即使用RNTI去加扰无线信道信息的循环冗余码(cyclic redundancy code，CRC)部分。解码时需要终端设备侧有相应的RNTI值，才能成功解码接收到的资源。终端设备会在在PDCCH的公共搜索空间(Common Search Space)去搜索公用的RNTI，如P-RNTI(paging RNTI)、SI-RNTI(system information RNTI)。而其他的RNTI一般会配置相应的搜索空间(Specific Search Space)，终端设备在相应的搜索空间去搜索，如果能成功解码对应的信息，终端设备即可读取PDSCH携带的信息。
其中，G-RNTI为Group RNTI，对于MBS可以使用G-RNTI加扰相应的下行控制信息(downlink control information，DCI)，由PDCCH承载。
6、终端设备的状态
6.1、RRC空闲态(RRC_IDLE)
空闲态是指终端设备在小区中驻留，但是未进行随机接入过程时终端设备所处的状态。终端设备通常在开机之后，或者在RRC释放之后进入空闲态。
6.2、RRC连接态(RRC_CONNECTED)
连接态是指终端设备完成随机接入过程之后，未进行RRC释放时所处的状态。终端设备在连接态可以与网络设备进行数据传输。
终端设备在处于空闲态时，在终端设备完成随机接入过程之后，终端设备的状态迁移至连接态。
6.3、RRC非激活态(RRC_INACTIVE)
非激活态是处于连接态和空闲态之间的状态，处于非激活态的终端设备，空中接口的用 户面承载已被暂停(suspend)，无线接入网(radio access network，RAN)-核心网(core network，CN)之间的用户面承载和控制面承载仍被维护。当终端设备发起呼叫或业务请求时，需要激活空口的用户面承载，并重用已有的RAN-CN之间的用户面承载和控制面承载。
7、切换技术(handover，HO)
在无线通信系统中，每个小区仅覆盖有限的范围，因此当终端设备从当前服务小区移动到相邻小区的时候，为了保证业务的连续性，网络侧需要将业务切换到相邻小区，从而不中断通信过程。简而言之，切换就是指在移动通信的过程中，为保证通信不中断，把承载通信数据的链路由一个小区或网络设备切换到另一个小区或网络设备的过程。
跨基站的切换是由源网络设备发起的，源网络设备根据终端设备上报的测量结果决定对终端设备进行切换，并向目标网络设备发送切换请求。在源网络设备获取目标网络设备允许切换的应答之后，源网络设备向终端设备发送切换命令。当终端设备接收到切换命令后，终端设备停止与源网络设备进行的上行或下行数据发送，并开始与目标网络设备进行同步，并发起随机接入过程。源网络设备在向终端设备发送切换命令时，可以停止与终端设备之间的上行或下行数据传输，并将保存在源网络设备的数据发往目标网络设备。终端设备在成功接入目标网络设备之后，可以开始与目标网络设备进行上行或下行数据的传输。
8、本申请实施例的技术方案可以应用于各种通信系统，例如：LTE系统，全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统，第五代(5th Generation，5G)系统，如NR，及未来的通信系统，如6G系统等。
本申请将围绕可包括多个设备、组件、模块等的系统来呈现各个方面、实施例或特征。应当理解和明白的是，各个系统可以包括另外的设备、组件、模块等，并且/或者可以并不包括结合附图讨论的所有设备、组件、模块等。此外，还可以使用这些方案的组合。
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
为便于理解本申请实施例，首先以图1中示出的通信系统为例详细说明适用于本申请实施例的通信系统。图1示出了适用于本申请实施例的通信方法的通信系统的示意图。如图1所示，该通信系统100包括网络设备102和终端设备106，网络设备102可配置有多个天线，终端设备也可配置有多个天线。可选地，该通信系统还可包括网络设备104，网络设备104也可配置有多个天线。图1仅为便于理解而示例的简化示意图，该通信系统中还可以包括其他网络设备或者还可以包括其他终端设备，图1中未示出。
网络设备102或网络设备104还可包括与信号发送和接收相关的多个部件。例如，处理器、调制器、复用器、解调器或解复用器等。
在该通信系统100中，网络设备102和网络设备104均可以与多个终端设备通信，例如图中示出的终端设备106。但应理解，与网络设备102通信的终端设备和与网络设备104通信的终端设备可以是相同的，也可以是不同的。图1中示出的终端设备106可同时与网络设备102和网络设备104通信。但这仅示出了一种可能的场景，在某些场景中，终端设备可能仅与网络设备102或网络设备104通信，本申请对此不做限定。
下面结合附图详细说明本申请实施例。
本申请实施例以SC-PTM传输技术为例进行具体说明，但可以理解，本申请实施例的技术方案同样适用于多小区协同传输技术。本申请实施例不仅适用于LTE系统、LTE-A系统中 的广播多播业务，也适用于NR无线网络系统中的广播多播业务。
在SC-PTM中，传送广播多播业务MBS业务数据的是单小区多播数据信道SC-MTCH，SC-MTCH由MBS单小区多播控制信道SC-MCCH来配置和控制。而SC-MCCH的配置信息则是由终端设备驻留小区的系统信息来广播，系统信息中包括SC-MCCH修改周期、重复周期以及无线帧偏置等。在进行MBS业务的小区中，每个小区配置一个SC-MCCH，每个MBS业务配置一个SC-MTCH。
SC-MCCH的重复周期受到网络设备的资源配置和MBS业务要求的限制，通常无法做到很短。当终端设备需要接收MBS业务时，终端设备首先接收系统信息获取SC-MCCH的配置信息，进而根据SC-MCCH的配置信息，等待SC-MCCH发送时机，获取SC-MCCH上承载的SC-MTCH的配置信息。受到SC-MCCH周期长度的限制，这个过程通常需要耗费一定的时间。
本申请实施例提供一种通信方法，终端设备通过主动向网络设备发送MBS业务配置的请求，能够迅速获取MBS业务所需的配置信息，从而接收MBS业务的数据。图2是本申请实施例提供的一种通信方法的流程图，下面将结合图2～图4对本申请实施例提供的通信方法进行详细说明，该通信方法包括：
S201：终端设备向网络设备发送随机接入消息，网络设备接收终端设备发送的随机接入消息。随机接入消息包括第一指示信息，第一指示信息用于请求第一配置，第一配置为广播多播MBS业务的配置。
终端设备所在的小区播放一个或多个MBS业务。当终端设备对该一个或多个MBS业务感兴趣，终端设备通过发起随机接入的方式向网络设备发送随机接入消息。该随机接入消息中包括有第一指示信息，用于向网络设备请求第一配置，第一配置为终端设备所感兴趣的一个或多个MBS业务的配置。
S202：网络设备响应于第一指示信息向终端设备发送广播多播MBS业务的第一配置广播多播，终端设备接收第一配置。
本申请实施例，终端设备在需要接收MBS业务时，主动向网络设备发送随机接入消息，通过随机接入消息向网络设备请求MBS业务的配置，从而完成MBS业务的接收。终端设备获取MBS的时延短，并且获取灵活。
图3和图4分别是本申请实施例示出的四步随机接入过程和两步随机接入过程的示意图，下面将结合图3和图4，对上述步骤进行具体说明。
在S201中，终端设备所在的小区播放一个或多个MBS业务，该一个或多个MBMS业务由网络设备向处于该小区内的多个终端设备发送。对于处于RRC空闲态或RRC非激活态的终端设备，当终端设备希望接收一个或多个MBS业务，该终端设备向网络设备发送随机接入消息，随机接入消息包括第一指示信息用于请求网络设备发送第一配置。
其中，随机接入过程可以为四步随机接入过程。如图3所示，终端设备向网络设备发送随机接入消息1(Random Access Message 1，RA Msg1)，即随机接入请求或者随机接入前导码(Random Access Preamble)。随机接入请求是在随机接入资源，即上行随机接入信道(Random Access Channel，RACH)上发送的，并且随机接入请求中携带的前导码(Preamble)暗示了该终端设备需要发送的随机接入消息3(Random Access Message3，RA Msg3)的大小。
网络设备向终端设备发送随机接入响应(Random Access Response)，即随机接入消息2(Random Access Message 2，RA Msg2)。网络设备接收到随机接入请求后，在下行共享信道上发送随机接入响应。随机接入响应由媒体接入控制(Media Access Control，MAC)层产生。
终端设备根据随机接入响应中所指示的资源，在上行共享信道上发送随机接入消息3。
网络设备向终端设备发送随机接入消息4(Random Access Message 4，RA Msg4)。
本申请实施例中，第一指示信息可以被包括在随机接入消息3中。终端设备在向网络设备发送随机接入消息1之后，网络设备响应于终端设备的随机接入请求，发送随机接入消息2，终端设备通过发送随机接入消息3发送第一指示信息。第一指示信息用于向网络设备请求MBS业务的配置。
网络设备响应于第一指示信息，可以通过随机接入消息4发送第一配置。
随机接入过程可以为两步随机接入过程。如图4所示，在NR无线网络系统中，针对终端设备和网络设备不需要进行同步的场景，提出两步随机接入过程。两步随机接入过程中的随机接入消息A(Random Access Message A，RA MsgA)包含随机接入码部分和数据部分，两部分可以各自独立解码。随机接入消息A类似于四步随机接入的RA Msg1+RA Msg3。随机接入码部分用于发送preamble码，即为四步随机接入中RA Msg1的随机接入码preamble；数据部分类似于四步随机接入中的RA Msg3。随机接入消息B(Random Access Message B，RA MsgB)类似于四步随机接入中的RA Msg2+RA Msg4。
本申请实施例中，第一指示信息可以被包括在随机接入消息A中，终端设备通过发送随机接入消息A发送第一指示信息。第一指示信息用于向网络设备请求MBS业务的配置。网络设备响应于第一指示信息，通过随机接入消息B发送第一配置。
在S202中，网络设备响应于第一指示信息，向终端设备发送第一配置。网络设备可以通过四步随机接入过程中的随机接入消息4发送第一配置，也可以通过两步随机接入过程的随机接入消息B发送第一配置。这取决于终端设备发送第一指示信息所采用的是四步随机接入过程还是两步随机接入过程。
在SC-PTM广播多播传输技术的背景下，本申请实施例中的第一配置可以包括：承载于系统信息块中的关于SC-MCCH的控制和配置信息，承载于SC-MCCH上的关于广播多播业务SC-MTCH的控制和配置信息，以及其他与MBS业务传输相关的配置。系统信息块可以是SIB20。
在SC-PTM广播多播传输技术的背景下，还可以以形式二和形式三获取MBS业务。例如在形式二中，本申请实施例中的第一配置可以on demand SI，或承载于on demand SI上的MBS业务的配置。形式三中本申请实施例中的第一配置可以包括通过系统信息广播的MBS业务的配置。
本申请实施例适用于在LTE系统、LTE-A系统中的广播多播MBMS业务，以及NR或者NR之后的无线网络系统中的MBS业务，并支持多小区协同传输或者其他多播传输技术的情景。在这些情景下，本申请实施例中的第一配置可以包括MBS业务接收的形式一、形式二以及形式三中的MBS业务的配置。形式一中MBS业务的配置包括：承载于系统信息中的关于MCCH的控制和配置信息，或承载于MCCH上的关于广播多播业务MTCH的控制和配置信息，或其他与MBS业务传输相关的配置。形式二中MBS业务的配置包括：包含于广播SI上的on demand SI，或承载于on demand SI上的MBS业务的配置，或其他与MBS业务传输相关的配置信息。形式三中MBS业务的配置包括通过系统信息广播的MBS业务的配置。
本申请实施例终端设备通过随机接入过程向网络设备请求感兴趣的MBS业务的配置，从而实现对MBS业务的快速接收，减少MBS业务传输的时延，提高MBS业务的传输灵活性。
下面简单对本申请实施例的方案在多小区协同传输情景下的适用性进行说明。多小区协同传输技术中一种典型的传输技术为MBSFN技术。MBSFN是一种同步播放传输技术，指同 一时间从多个小区发射一样的无线信号。MBSFN技术中存在一个MBSFN区的概念，MBSFN区包括一组小区，这一组小区被协调起来完成一次MBSFN传输。一个小区可以属于多个MBSFN区，每个MBSFN区传输不同的内容，有不同的小区集。本申请实施例中，当终端设备对MBSFN区内的一个或多个MBS业务感兴趣，向网络设备发起随机接入请求，该网络设备是向MBSFN区发送MBMS业务的网络设备。
本申请实施例还提供了另一种通信方法，本申请实施例同样是以SC-PTM传输技术为例进行具体说明，但可以理解，本申请实施例的技术方案同样适用于多小区协同传输技术以及其他多播传输技术。本申请实施例不仅适用于LTE系统、LTE-A系统中的广播多播业务，也适用于NR无线网络系统中的广播多播业务。图5是本申请实施例提供一种终端设备在从第一小区向第二小区移动的示意图，图6是本申请实施例提供的SC-PTM传输技术中SC-MCCH和SC-MTCH发送周期示意图，图7是本申请实施例提供的另一种通信方法的流程图。
下面结合图5～图7对此进行详细的说明。终端设备在第一小区接收广播多播MBS业务，同时该终端设备由于移动性需求，从第一小区向第二小区移动。第二小区在播放或将要播放终端设备正在第一小区接收的MBS业务，终端设备需要在进入第二小区之后对该MBS业务继续接收。第一小区和第二小区均支持MBS业务的传输，包括支持SC-PTM传输方式。网络设备在第一小区上向处于第一小区内的终端设备进行MBS业务的传输，网络设备在第二小区上向处于第二小区的终端设备进行MBS业务的传输。尽管第一小区和第二小区播放的MBS业务可以是同一业务，例如，同样都在播放某一个重大体育赛事的直播，但第一小区和第二小区播放此MBS业务的配置信息可能不同。终端设备在从第一小区向第二小区移动之后，需要对该MBS业务的配置重新获取。
下面将针对SC-PTM场景下，终端设备从第一小区移动到第二小区对MBS的配置进行重新获取的过程进行说明。
终端设备从第一小区通过小区重选过程进入第二小区。由于第一小区和第二小区MBS业务的配置可能不同，终端设备可以监听并且接收MBS业务的配置时刻、频域位置等也可能不同。当终端设备从第一小区重选至第二小区后，为了继续接收一个或多个MBS业务，需要在第二小区首先接收MBS业务的配置。终端设备根据此配置去接收MBS业务的数据，比如承载于SC-MTCH或者其他逻辑信道的业务的数据。由于MBS业务的配置是以一定周期重复发送，所以终端设备在完成小区重选后，需要等待到MBS业务的配置的发送时刻才可以接收到MBS业务的配置。
图6中，以MBS业务的配置SC-MCCH和SC-MTCH为例进行说明，第一小区和第二小区上SC-MCCH的发送时机采用无填充的矩形框表示，相邻矩形框之间的时间长度代表第一小区和第二小区上SC-MCCH的发送周期，第一小区和第二小区SC-MCCH的配置可能不同。第一小区和第二小区上SC-MTCH的发送时机采用斜线填充的矩形框表示，相邻矩形框之间的时间长度代表第一小区和第二小区SC-MTCH的重复周期。终端设备在t1时刻从第一小区通过小区重选进入第二小区。终端设备在进入第二小区时，前一个SC-MCCH已经被发送出去，此时距离下一个SC-MCCH的发送时刻t2还有一段时间。终端设备只能等待到下一个SC-MCCH发送的时刻才能接收SC-MCCH承载的配置，等待的时间长度取决于第二小区中SC-MCCH的发送周期。在等待的时间里，MBS业务处于中断状态，这不仅造成了数据传输的延时和中断，也无法保证对于通信质量的要求。
本申请实施例提供的通信方法，能够提高正在接收MBS业务的终端设备更换小区之后接收MBS业务的连续性。参考图7，该通信方法包括：
S701:终端设备接收第一小区发送的第二配置，第二配置为广播多播MBS业务的配置。
第一小区向第一小区中的终端设备广播一个或多个广播多播MBS业务。第一小区可以采用SC-PTM技术进行MBS业务的传输。处于第一小区中的终端设备接收感兴趣的一个或者多个MBS业务。一种可能的方式，终端设备在接收MBS业务时，首先接收系统信息，通过系统信息获取SC-MCCH的配置信息，SC-MCCH的配置信息包括SC-MCCH的重复周期。获取SC-MCCH上承载的第二配置，第二配置为广播多播MBS业务的配置，该广播多播MBS业务的配置可以为SC-MCCH逻辑信道承载的关于SC-MTCH的配置和控制信息，进而获取SC-MTCH上承载的MBS业务的数据，完成MBS业务的接收。第一小区发送第二配置是指网络设备在第一小区上发送第二配置，第一小区广播一个或多个广播多播MBS业务是指网络设备在第一小区上广播一个或多个广播多播MBS业务。
第一配置是终端设备接收的第二小区的MBS业务的配置，第二配置是终端设备接收的第一小区的MBS业务的配置。第一配置和第二配置是同一个MBS业务的配置。第一配置和第二配置可以相同，也可以不同。
本申请实施例中的第一配置和第二配置可以与图2～图4的实施例中的第一配置包括的内容相同，这里不再一一列举。S702：终端设备通过小区重选驻留于第二小区。
终端设备基于移动性的需求，需要从第一小区移动到第二小区。本申请实施例中，终端设备通过小区重选驻留于第二小区。第二小区广播有终端设备在第一小区中正在接收的一个或多个MBS业务。终端设备驻留于第二小区，具有继续接收原本在第一小区接收的MBS业务的需求。
S703：终端设备在第二小区向网络设备发送随机接入消息，随机接入消息包括第一指示信息，第一指示信息用于请求第一配置，第一配置为广播多播MBS业务的配置。
终端设备在第二小区发送随机接入消息，接收该随机接入消息的网络设备在第二小区上广播一个或多个广播多播MBS业务。终端设备在第一小区接收的MBS业务和在第二小区接收的MBS业务可以是相同的，例如是同一场重大体育赛事的直播。S703步骤与S201步骤的其余具体细节相同，可以参照S201对本实施例中的S703进行理解，此处不再赘述。
S704：网络设备响应于第一指示信息，向终端设备发送第一配置。可以理解本步骤中的网络设备在第二小区上向处于第二小区的终端设备发送第一配置，第一配置是网络设备向通过小区重选后驻留于第二小区内的终端设备发送的。S704步骤与S202步骤的其余具体细节相同，可以参照S202对本实施例中的S704进行理解，此处不再赘述。
本申请实施例提供的通信方法，终端设备在第一小区接收MBS的配置，在终端设备移动到第二小区之后，终端设备主动发起随机接入过程，向第二小区请求MBS业务的配置。从而无需等待第二小区MBS业务的配置的发送时机，减少由于终端设备的移动带来的接收MBS业务的时延，增强MBS业务的连续性。
下面将结合示例性的可选实施方式对步骤701～704进行具体说明。
终端设备在第一小区接收广播多播MBS业务的第二配置，第二配置可以是承载于SC-MCCH逻辑信道的信息，包括SC-MTCH的配置信息以及控制信息。可以理解，对于SC-PTM场景，一个小区通常具有一个SC-MCCH，一个MBS业务配置有一个SC-MTCH。在逻辑信道SC-MCCH上承载多个MBS业务的配置。第二配置可以包括广播多播MBS业务的标识信息。作为广播多播MBS业务的标识信息的可以包括但是不限于：临时移动组标识(Temporary Mobile Group Identity，TMGI)，业务标识符(identifier，ID)，用于调度一组终端设备的RNTI，比如G-RNTI，也可以是其他IE或者字段field，以及任意用于指示此MBS业 务的信息。
广播多播MBS业务的标识信息用于对每个MBS业务进行标识，终端设备在第一小区接收一个或多个带有标识的MBS业务。通过标识信息对每个MBS业务进行识别。终端设备通过小区重选驻留于第二小区，向第二小区请求所述在第一小区所接收的一个或多个或所有MBS业务的配置。
第二配置还可以包括第二指示信息，第二指示信息用于指示广播多播MBS业务配置有保证业务连续性的需求，比如对于业务中断时间或者是否允许中断的要求，对业务连续性增强的要求等，根据业务连续性发送随机接入消息。第二配置还可以包括业务优先级信息，也就是每个广播多播MBS业务所对应的优先级。所述终端设备可以根据所述优先级信息决定是否向网络设备请求此广播多播MBS业务的配置信息。网络设备也可以根据所述优先级信息决定是否向终端设备发送此广播多播MBS业务的配置信息。虽然第二指示信息和广播多播MBS业务的标识信息都可以被包括在第二配置中，但可以理解，第二配置可以承载于不同信令中分别发送。因此，第二指示信息和MBS业务的标识信息可以在不同的信令中发送。
终端设备在第一小区接收第二配置，第二配置可以包括第二指示信息。第二配置可以是承载于SC-MCCH逻辑信道的信息，在逻辑信道SC-MCCH上承载多个MBS业务的配置。第二指示信息可以指示MBS业务是否配置有业务连续性。在第一小区被终端设备接收的MBS业务如果被指示配置有业务连续性，当该终端设备移动到第二小区，终端设备在第二小区接收配置有业务连续性的MBS业务的时候，就需要采用业务连续性保障的机制。也就是说，该终端设备进入到第二小区需要向第二小区发送随机接入消息，请求第二小区发送该MBS业务的配置。如果终端设备在第一小区接收的MBS业务被指示没有配置业务连续性，那么，当终端设备移动到第二小区，终端设备针对于该MBS业务在第二小区的接收可以不发送随机接入消息，而是等待第二小区向终端设备在固有的发送时机发送MBS业务的配置。
举例而言，终端设备在第一小区接收五个MBS业务：MBS1、MBS2、MBS3、MBS4、MBS5，SC-MCCH逻辑信道上承载SC-MTCH1的配置信息、SC-MTCH2的配置信息、SC-MTCH3的配置信息、SC-MTCH4的配置信息、SC-MTCH5的配置信息，SC-MTCH1～SC-MTCH5分别承载MBS1～MBS5的数据。第二指示信息可以指示MBS1、MBS2、MBS3配置有业务连续性。例如第二指示信息可以分别在SC-MTCH1的配置信息、SC-MTCH2的配置信息和SC-MTCH3的配置信息中指示MBS1、MBS2、MBS3业务配置有业务连续性。此时，当终端设备从第一小区移动到第二小区，终端设备向第二小区发送随机接入消息，该随机接入消息中包括第一指示信息用于请求第二小区发送MBS1、MBS2、MBS3业务的配置。第二小区响应于第一指示信息，向终端设备发送第一配置。第二小区向终端设备发送的第一配置为MBS1、MBS2、MBS3业务的配置，而不包括MBS4和MBS5业务的配置。可选的终端设备也可以根据业务优先级请求MBS业务的配置信息。比如MBS1、MBS2的优先级为高，MBS3优先级为中。终端设备可以根据信道质量，上行资源大小等因素选择请求不同的MBS业务的配置信息，请求业务的优先级顺序由高至低。例如，终端设备首先请求MBS1和MBS2的配置信息，而后请求MBS3的配置信息，或者不再请求MBS3的配置信息。网络设备也可以根据收到的MBS业务的配置请求信息，结合当前资源使用情况，信道质量等情况等因素选择发送不同的MBS业务的配置信息，发送的业务的优先级顺序由高至低。例如，网络设备优先发送MBS1和MBS2的配置信息，而后发送MBS3的配置信息。在资源受限的情况下，也可能不发送MBS3的配置信息。
通过在第二配置中设置第二指示信息，可以使终端设备在移动到第二小区以后，根据第 二指示信息的指示以更灵活的方式接收MBS业务及其配置信息。终端设备在第二小区只需要向网络设备请求需要保障业务连续性的MBS业务的配置，第二小区内其他的MBS业务的配置不需要请求。
第二指示信息可以采用显示指示的方式，也可以是隐式指示。对于显示指示，可以在第二配置中新增IE或字段，该IE或字段的属性可以是枚举类型，例如可以枚举{ture/false},也可以枚举{supported/notSupported}。true或supported可以表示所指示的MBS业务配置有业务连续性，false或notSupported可以表示所指示的MBS业务没有配置业务连续性。对于隐式指示，可以通过将该MBS业务映射到特定无线承载(radio bearer，RB)等来指示，比如特定的数据无线承载(data radio bearer，DRB)或者多播无线承载(MBS point to multipoint radio bearer，MRB)。
本申请实施例第二配置中包括第二指示信息，可以实现MBS业务和业务连续性机制的绑定。例如第二指示信息可以指示在一个小区内广播的一个或一些MBS业务在终端设备移动时采用业务连续性机制。从而减少特定MBS业务传输的时延。
可以理解，终端设备通过小区重选所驻留的第二小区至少正在广播终端设备在第一小区接收的一个MBS业务，当终端设备通过小区重选驻留于第二小区，终端设备继续接收该一个或多个MBS业务。第二小区与第一小区同样支持MBS业务传输，例如可以采用SC-PTM传输技术广播MBS业务。与上述内容中介绍过的SC-PTM技术的形式一的传输原理相同，第二小区广播系统信息，终端设备首先接收系统信息，根据系统信息获取SC-MCCH的配置信息，根据SC-MCCH的配置信息，获取SC-MCCH上承载的SC-MTCH的配置信息，进而获取SC-MTCH上承载的MBS业务的数据。
第二小区内的SC-MCCH的发送周期、发送时刻等与第一小区内的SC-MCCH的发送周期、发送时刻等可能不同。如果终端设备驻留于第二小区没有向第二小区发送随机接入消息，而是等待接收第二小区发送SC-MCCH的时机，由于终端设备驻留于第二小区的时间的不确定性，致使终端设备等待接收SC-MCCH的时长不确定。假设，终端设备进入第二小区时恰好正是SC-MCCH的时机到来，那么终端设备可以不必向第二小区发送随机接入消息去请求MBS业务的配置。
有鉴于此，本申请实施例中，终端设备在驻留于第二小区，首先接收第二小区的系统信息，根据系统信息确定是否发送随机接入消息。具体而言，系统信息承载MBS业务的配置的修改周期、重复周期以及无线帧偏置等。终端设备接收到系统信息之后，能够获知第二小区发送下一个MBS业务的配置时间，从而终端设备决定是否向第二小区发送随机接入消息，请求MBS的配置。
为了不产生混淆，本申请实施例后续中，将网络设备按照第二小区内的MBS业务固有的发送周期发送的MBS配置称之MBS业务的第三配置。第二小区内的MBS业务的配置固有的发送周期是指：第二小区根据协议规定的发送MBS业务的配置的周期。可以理解，第三配置和第一配置的内容可以是相同的，因为都是由第二小区发送的关于第二小区上MBS业务的配置。或者，由于第一配置是终端设备主动请求网络设备发送的，终端设备所请求的第一配置是需要保证业务连续性的MBS业务的配置，第三配置是网络设备主动发送的第二小区内相关MBS业务的配置。因此第三配置的内容可以包括第一配置的内容，但二者关于相同的一个MBS业务的配置的内容是相同的。第一配置是终端设备向网络设备发送随机接入消息请求MBS的配置之后，网络设备发送的。第三配置的发送不需要终端设备向网络设备请求。因此，第二小区发送第一配置的时间与第二小区的MBS业务的配置的重复周期无关。
第二小区发送广播多播MBS业务的第三配置，该广播多播MBS业务的第三配置为小区内支持的MBS业务的配置信息，其中包含终端设备驻留于第二小区欲接收的MBS的业务的配置。终端设备根据系统信息能够确定终端设备在第二小区上接收第三配置的时间，终端设备可以根据该时间确定是否发送随机接入消息。需要注意的是，确定终端设备接收第三配置的时间并不是指终端设备实际上接收了第三配置的时间，而是终端设备如果不发送随机接入消息，等待接收第三配置，将在何时接收到第三配置。换言之存在一种情况，终端设备还未发送随机接入消息，只是根据系统信息确定了接收第三配置的时间。
具体而言，终端设备进入第二小区时可能并没有刚好处于第三配置的发送时机。根据系统信息终端设备能够确定在进入第二小区之后，接收下一个第三配置的时间。终端设备比较接收第三配置的时间和接收第一配置的时间。当确认接收第三配置的时间晚于接收第一配置的时间，说明终端设备如果不向网络设备发送随机接入消息请求MBS业务的配置，将会等待更长的时间才能获取第三配置。因此，终端设备此时发送随机接入消息，向第二小区请求第一配置。当确认终端设备接收第三配置的时间等于接收第一配置的时间，终端设备可以选择向网络设备发送随机接入消息，也可以选择等待接收网络设备发送的第三配置。换言之，终端确定第三配置和第一配置中的哪个到来的早，就去接收到来较早的那个配置。
终端设备可以对接收第一配置的时间做出预判。这个预判的过程为：终端设备可以计算随机接入过程的时间以及网络设备的响应时间，以接收系统信息的时间为起点，经过随机接入过程的时间以及网络设备的响应时间之后，为终端设备接收第一配置的时间。该系统信息为包括MBS业务的配置的系统信息。
终端设备根据系统信息确定接收第三配置的时间的过程为：系统信息中携带有第二小区发送第三配置的发送周期、偏置以及配置信息开始传输的子帧，时隙，符号等信息。终端设备根据第三配置的发送周期、偏置以及配置信息开始传输的子帧，时隙，符号等信息，能够确定在终端设备进入第二小区之后，第二小区发送下一个第三配置的时间，也就是终端设备接收第三配置的时间。
终端设备通过比较接收第一配置的时间和接收第三配置的时间，能够以更短的时间获取到MBS业务的配置，从而提升终端设备在小区间移动过程中接收MBS业务的连续性，提升通信质量。
本申请实施例同样适用于终端设备从一个MBSFN区向另一个MBSFN区移动的情景。
本申请实施例还提供了另一种通信方法，图8是本申请实施例提供的另一种通信方法的流程图。本申请实施例所提供的通信方法同样可以用于解决终端设备从一个小区向另一个小区移动过程中，MBS业务接收的连续性问题。
对于RRC空闲态或RRC非激活态的终端设备，如果向目标小区移动时正在原小区接收MBS业务，在通过小区重选进入目标小区后，重新在目标小区对该MBS业务进行获取，如果多播配置信息是周期性广播的信息，那么在此过程中终端设备会中断在原小区所接收的MBS业务，在新小区接收配置后才可以继续接收多播业务，这个过程通常具有较大的业务中断和时延。为了降低终端设备在小区间移动的过程中接收MBS业务的业务中断，可以采取业务连续性保障机制。但对于不同的MBS业务而言，业务质量或者连续性的要求可能并不一致。有些MBS业务质量或者连续性要求较低，终端设备在小区间移动带来的业务中断对该MBS业务本身并无太大的影响。但是对于那些需要克服系统时延，保障业务连续性的MBS业务而言，需要业务连续性保障机制。
有鉴于此，本申请实施例提供的通信方法，包括：
S801：网络设备生成广播多播MBS业务的第二配置，网络设备向终端设备发送广播多播MBS业务的第二配置，终端设备接收广播多播MBS业务的第二配置，第二配置包括第二指示信息，第二指示信息用于指示广播多播MBS业务配置有业务连续性。
本申请实施例仍然以SC-PTM传输技术为例，但与上述实施例相同，本申请实施例的技术方案同样适用于多小区协同传输技术，例如MBSFN技术。本申请实施例不仅适用于LTE系统、LTE-A系统中的广播多播业务，也适用于NR和未来的无线网络系统中的广播多播业务。
终端设备所在的小区可以支持采用SC-PTM技术传输MBS业务。承载广播多播业务MBS业务数据的是单小区多播数据信道SC-MTCH，SC-MTCH由单小区多播控制信道SC-MCCH来配置和控制。第二配置可以承载于SC-MCCH上，第二配置可以为SC-MCCH逻辑信道承载的关于SC-MTCH的配置和控制信息。
本申请实施例中，第二配置还包括第二指示信息，第二指示信息用于指示广播多播MBS业务配置有业务连续性。第二指示信息对于业务连续性的指示是针对于每个广播多播MBS业务而言，第二指示信息指示该广播多播MBS业务配置有业务连续性，则说明终端设备在小区间移动进入新小区时，需要对该MBS业务采用业务连续性保障机制。
S802：根据第二配置接收广播多播MBS业务的数据。
终端设备接收第二配置，并根据第二配置获取广播多播MBS业务的数据。此时，终端设备正在原小区接收广播多播MBS业务。
本申请实施例中的第一配置和第二配置可以与图2～图4的实施例中的第一配置包括的内容相同，这里不再一一列举。
终端设备在获取第二配置之后，进而获取广播多播MBS业务的数据，完成MBS业务的接收。
S803：第二配置还包括触发随机接入的第一准则，满足第一准则，终端设备发起随机接入。
本申请实施例中，第二配置还包括触发随机接入的第一准则，终端设备对是否满足第一准则进行判定。当满足第一准则，终端设备向网络设备发起随机接入，进入RRC连接态。
本申请实施例中，处于RRC空闲态或RRC非激活态的终端设备在小区内接收广播多播MBS业务，该广播多播MBS业务的第二配置中包含有第二指示信息，用于指示该广播多播MBS业务是否配置有业务连续性。当第二指示信息指示该MBS业务配置有业务连续性，终端设备在小区间移动时，需要采取业务连续性保障机制。本申请实施例中的业务连续性保障机制为：终端设备判断是否满足第一准则，如果满足，则进入RRC连接态。终端设备进入RRC连接态以后，后续行为可以由网络设备进行调度。另一方面，由于终端设备需要进入RRC连接态，相比于空闲态或非激活态，终端设备会增加一定的耗电量，网络设备对终端设备需要进行调度，也需要消耗一定的系统资源。因此，本申请实施例中，通过采用第二指示信息的方式，指示广播多播MBS业务是否配置有业务连续性。终端设备接收了配置有业务连续性的MBS业务，需要采取业务连续性保障机制。终端设备接收的MBS业务如果没有配置有业务连续性，则不需要采取业务连续性保障机制，从而在保障业务连续性的同时节约资源。
下面将结合示例性的可选实施方式对上述步骤进行具体说明。
终端设备在第一小区接收广播多播MBS业务的第二配置，获取第二配置后，根据第二配置获取该广播多播MBS业务的数据，完成在第一小区内对该广播多播MBS业务的接收。第二配置可以包括广播多播MBS业务的标识信息。作为广播多播MBS业务的标识信息的可以 包括但是不限于：临时移动组标识(Temporary Mobile Group Identity，TMGI)，业务标识符(identifier，ID)，用于调度一组终端设备的RNTI，比如G-RNTI，也可以是其他IE或者字段field，以及任意用于指示此MBS业务的信息。MBS广播多播MBS业务的标识信息用于对每个MBS业务进行标识，终端设备在第一小区接收一个或多个带有标识的MBS业务。通过标识信息对每个MBS业务进行识别。
当终端设备基于移动性的需求，需要向第二小区移动，对于终端设备正在接收的该广播多播MBS业务是否需要业务连续性保障，由第二配置中的第二指示信息进行指示。
第二指示信息可以采用显示指示的方式，也可以是隐式指示。对于显示指示，可以在第二配置中新增IE或字段，该IE或字段的属性可以是枚举类型，例如可以枚举{ture/false},也可以枚举{supported/notSupported}。true或supported可以表示所指示的广播多播MBS业务配置有业务连续性，false或notSupported可以表示所指示的广播多播MBS业务没有配置业务连续性。
对于隐式指示，可以通过将该MBS业务映射到特定无线承载(radio bearer，RB)等来指示，比如特定的数据无线承载(data radio bearer，DRB)或者多播无线承载(MBS point to multipoint radio bearer，MRB)。此外，第二配置中还包括有第一准则，当终端设备满足第一准则，终端设备向第一小区发起随机接入。那么，可以将第二配置中是否包括有第一准则作为第二指示信息的隐式指示方式。当第二配置中包含有第一准则，认为该广播多播MBS业务配置有业务连续性。当第二配置中不包含有第一准则，认为该广播多播MBS业务没有配置业务连续性。需要说明的是，在显示指示的情况下，广播多播MBS业务是否配置业务连续性依靠前面列举的IE或字段或其他显示指示方式来指示，与第二配置中是包含第一准则无关。
当第二指示信息指示终端设备接收的广播多播MBS业务配置有业务连续性，终端设备判断是否满足第一准则，满足第一准则，终端设备将发起随机接入。第一准则包括判断信号质量或信道质量达到阈值。信道质量或信号质量可以是终端设备的测量结果，可以包括：参考信号接收功率(Reference Signal Received Power，RSRP)、参考信号接收质量(reference signal received quality，RSRQ)、信号干扰噪声比(signal to interference plus noise ratio，SINR)或误块率(block error rate，BLER)中的至少一个。此时，信号质量或信道质量达到阈值是指：终端设备对上述参数的测量值等于或低于阈值。根据终端设备对上述参数的测量结果判断信号质量或信道质量与阈值相比较差。第一准则可以为：终端设备在第一小区内对信道质量或信号质量进行测量，当确定测量结果达到阈值，终端设备发起随机接入。或者，第一准则可以为：第一时间段内信号质量或信道质量多次达到阈值，终端设备触发随机接入。在此情况下，信号质量或信道质量仅在一次测量时达到阈值并不会触发随机接入，而是在第一时间段内多次测量结果达到阈值才会发起随机接入。这样的方式可以避免单次测量结果不准确导致误触发随机接入。或者，第一准则可以为：终端设备在信号质量或信道质量的测量结果达到阈值后的第二时间段之后触发随机接入。
本申请实施例中，终端设备向网络设备发起随机接入，通过随机接入进入RRC连接态。该网络设备是在第一小区上发送广播多播MBS业务的网络设备。终端设备发起随机接入可以是基于竞争的随机接入(contention based random access procedure)，也可以是基于非竞争的随机接入(non-contention based random access procedure)。在基于非竞争随机接入的情况下，网络设备可以在第二配置信息中将非竞争随机接入所需的资源发送给终端设备。网络设备也可以通过其他信息将非竞争随机接入所需的资源发送给终端设备。
在终端设备发起随机接入的过程中，可以向网络设备发送第一信息，第一信息用于指示发起随机接入的原因。例如，终端设备指示网络设备发起随机接入是为了在更换小区的过程中保持广播多播MBS业务接收的连续性。网络设备接收第一信息后，将能够获知终端设备此时发起随机接入的原因是为了保持广播多播MBS业务的连续性。类似的，对于第一信息可以采用显示指示的方式，例如新增IE或字段。也可以采用隐式指示的方式进行指示。
第二配置还可以包括业务优先级信息，也就是每个广播多播MBS业务所对应的优先级。所述终端设备可以根据所述优先级信息决定是否向网络设备请求此广播多播MBS业务的配置信息，网络设备也可以根据所述优先级信息决定是否向终端设备发送此广播多播MBS业务的配置信息。
终端设备在第一小区进入RRC连接态以后，后续行为由网络设备进行调度。网络设备通过小区切换(handover，HO)使终端设备从第一小区进入第二小区，并在第二小区继续接收该广播多播MBS业务的第一配置，因此可以保证广播多播MBS业务接收的连续性。在切换过程中，第一小区向第二小区发送切换请求，所发送的切换请求中携带有广播多播MBS业务的信息，用于第二小区终端设备正在接收的MBS业务的信息。或者切换请求中携带有MBS业务的进度信息，进度信息指示第一小区内每个MBS业务的进度。第二小区在接收到切换请求之后，发送切换请求的确认信息给第一小区，该确认信息中可以携带第二小区的MBS业务的信息。该信息包括第二小区支持哪些MBS业务，每个MBS业务的进度信息，以及终端设备接收第二小区的MBS业务所需要的配置信息。第一小区根据确认信息为终端设备确定切换小区为第二小区，并可以将第二小区的MBS业务的配置信息发送给终端设备，并指示终端设备进行切换。由此，保证终端设备从第一小区进入第二小区的业务连续性。
与图5～图7的实施例类似的，第一配置是终端设备在第二小区接收的MBS业务的配置，第二配置是终端设备第一小区接收的MBS业务的配置。第一配置和第二配置是同一个MBS业务的配置。第一配置和第二配置可以相同，也可以不同。
第二小区同样可以支持采用SC-PTM技术传输MBS业务。第一配置可以承载于SC-MCCH上，第一配置可以为SC-MCCH逻辑信道承载的关于SC-MTCH的配置和控制信息。终端设备获取第一配置后，进而获取SC-MTCH上承载的MBS业务的数据，完成MBS业务的接收。
终端设备在第二小区获取到第一配置之后，可以对是否满足第二准则进行判断，当满足第二准则，终端设备可以回到RRC空闲态或RRC非激活态。网络设备为终端设备而配置第二准则，可以包含于随机接入响应消息，RRC连接重配置(RRC reconfiguration)或者其他消息中。终端设备通过小区切换进入第二小区，此时与第二小区保持连接，终端设备处于RRC连接态。终端设备获取到广播多播MBS业务的第一配置，并根据第一配置接收广播多播MBS业务。在上述过程中，终端设备在第二小区可以对是否满足第二准则进行判断。第二准则可以包括判断信号质量或信道质量达到阈值，或者第二准则包括一个触发测量事件。以第二准则为判断信号质量或信道质量达到阈值为例，终端设备在第二小区内对信道质量或信号质量进行测量，信道质量或信号质量可以包括：参考信号接收功率(Reference Signal Received Power，RSRP)、参考信号接收质量(reference signal received quality，RSRQ)、信号干扰噪声比(signal to interference plus noise ratio，SINR)或误块率(block error rate，BLER)中的至少一个。终端设备对上述参数的测量值等于或高于阈值。根据终端设备对上述参数的测量结果判断信号质量或信道质量与阈值相比较好。此时，终端设备可以回到RRC空闲态或RRC 非激活态，并在此状态下继续接收广播多播MBS业务的配置。具体方法可以包括：当信号质量或信道质量满足第二准则时，终端设备将测量结果上报给网络设备，网络设备决定让终端设备离开RRC连接态，可选的网络设备可以释放终端设备的RRC连接，使得终端设备进入RRC空闲态；网络设备也可以根据终端设备进入连接态之前的状态，决定让终端设备回到原状态。另外一种可能的实施方式，终端设备判断信号质量或信道质量满足第二准则后，向网络设备发出请求，请求离开RRC连接态，可选的终端设备请求网络设备释放RRC连接，使得终端设备进入RRC空闲态；或者网络设备也可以根据终端设备进入连接态之前的状态，请求网络设备允许其回到原状态；或者网络设备基于实现，决定终端设备离开RRC连接后的状态。
由此可以满足广播多播MBS业务连续性的要求，同时降低终端设备耗电量。
本申请实施例同样适用于终端设备从一个MBSFN区向另一个MBSFN区移动的情景。
本申请实施例中，终端设备在第一小区接收广播多播MBS业务，并在第一小区内对是否需要进入RRC连接态进行判断，通过进入RRC连接态保证更换小区后的广播多播MBS业务接收的连续性。基于不同广播多播MBS业务具有不同的质量要求，需要对广播多播MBS业务的连续性需求区别对待。因此，本申请实施例中，广播多播MBS业务的第二配置包括有第二指示信息，用于指示此广播多播MBS业务是否需要保障业务连续性。当终端设备所接收的广播多播MBS业务配置有业务连续性，则采取业务连续性保障机制。当终端设备所接收的广播多播MBS业务没有配置业务连续性，则无需采取业务连续性保障机制。本申请实施例能够在满足广播多播MBS业务连续性要求的同时，降低终端设备和网络设备的功耗。
本申请实施例中第一小区和第二小区属于网络设备。对于第一小区发送或接收信息是指网络设备发送或接收信息，对于第二小区发送或接收信息是指网络设备发送或接收信息。
前文介绍了本申请实施例的通信的方法，下文中将介绍本申请中各个实施例中的通信的装置。例如该装置可以采用图2-8中示出的方案涉及的方法。该装置是基于同一技术构思的，由于方法、装置解决问题的原理相似，因此装置与方法的实施可以相互参见，重复之处不再赘述。
本申请实施例还提供一种通信装置，该通信装置可以是终端设备也可以是电路。该通信装置可以用于执行上述图1～图7方法中由终端设备所执行的动作。
该通信装置包括：包括：收发模块，用于发送随机接入消息，所述随机接入消息包括第一指示信息，所述第一指示信息用于请求广播多播MBS业务的第一配置；所述收发模块还用于接收所述第一配置。
本申请实施例，终端设备在需要接收MBS业务时，主动向网络设备发送随机接入消息，通过随机接入消息向网络设备请求MBS业务的配置，从而完成MBS业务的接收。具有时延短，MBS业务获取灵活的特点。
本实施例所提供的通信装置，还可以用于执行上述图1～图7方法实施例任一可能的实现方式中的方法，具体内容可以参照图1～图7方法中关于终端设备所执行动作的部分内容，此处不再赘述。
本申请实施例还提供一种通信装置，该通信装置可以是终端设备也可以是电路。该通信装置可以用于执行上述图8方法中由终端设备所执行的动作。
该通信装置包括：包括：收发模块，用于接收广播多播MBS业务的第二配置，收发模块根据第二配置获取广播多播MBS业务的数据。第二配置包括第二指示信息，所述第二指示信息用于指示所述广播多播MBS业务配置有业务连续性。
本申请实施例中，通过采用第二指示信息的方式，指示广播多播MBS业务是否配置有业务连续性。终端设备接收了配置有业务连续性的MBS业务，需要采取业务连续性保障机制。终端设备接收的MBS业务如果没有配置有业务连续性，则不需要采取业务连续性保障机制，从而在保障业务连续性的同时节约资源。
本实施例所提供的通信装置，还可以用于执行上述图8方法实施例任一可能的实现方式中的方法，具体内容可以参照图8方法实施例中关于终端设备所执行动作的部分内容，此处不再赘述。
图9示出了一种简化的通信装置的结构示意图，便于理解和图示方便，图9中，通信装置以终端设备作为例子。如图9所示，该通信装置包括处理器、存储器、射频电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对终端设备进行控制，执行软件程序，处理软件程序的数据等。存储器主要用于存储软件程序和数据。射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。需要说明的是，有些种类的终端设备可以不具有输入输出装置。
当需要发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。为便于说明，图9中仅示出了一个存储器和处理器。在实际的终端设备产品中，可以存在一个或多个处理器和一个或多个存储器。存储器也可以称为存储介质或者存储设备等。存储器可以是独立于处理器设置，也可以是与处理器集成在一起，本申请实施例对此不做限制。
在本申请实施例中，可以将具有收发功能的天线和射频电路视为通信装置的收发模块，将具有处理功能的处理器视为通信装置的处理模块。如图9所示，通信装置包括收发模块101和处理模块102。收发模块也可以称为收发器、收发机、收发装置等。处理模块也可以称为处理器，处理单板，处理装置等。可选的，可以将收发模块101中用于实现接收功能的器件视为接收模块，将收发模块101中用于实现发送功能的器件视为发送模块，即收发模块101包括接收模块和发送模块。收发模块有时也可以称为收发机、收发器、或收发电路等。接收模块有时也可以称为接收机、接收器、或接收电路等。发送模块有时也可以称为发射机、发射器或者发射电路等。
应理解，收发模块101用于执行上述方法实施例中终端设备侧的发送操作和接收操作，处理模块102用于执行上述方法实施例中终端设备上除了收发操作之外的其他操作。
例如，在一种实现方式中，收发模块101用于执行图2中的S201和S203中终端设备侧的接收操作，和/或收发模块101还用于执行本申请实施例中终端设备侧的其他收发步骤。
再例如，在另一种实现方式中，收发模块101用于执行图7中S701、S703和S704中终端设备侧的接收操作，和/或收发模块102还用于执行本申请实施例中终端设备侧的其他收发步骤。处理模块102，用于执行图7中的S702，和/或处理模块102还用于执行本申请实施例中终端设备侧的其他处理步骤。
再例如，在另一种实现方式中，收发模块101用于执行图8中S801、S802和S803中终端设备侧的接收操作，和/或收发模块102还用于执行本申请实施例中终端设备侧的其他收发步骤。处理模块102用于执行本申请实施例中终端设备侧的其他处理步骤。
当该通信装置为芯片类的装置或者电路时，该芯片装置可以包括收发模块和处理模块。其中，所述收发模块可以是输入输出电路、和/或通信接口；处理模块为该芯片上集成的处理器或者微处理器或者集成电路。
本实施例中的通信装置为终端设备时，可以参照图10所示的设备。在图10中，该设备包括处理器111，发送数据处理器112，接收数据处理器113。上述实施例中的处理模块可以是图10中的该处理器111，并完成相应的功能。上述实施例中的收发模块可以是图10中的发送数据处理器112，和/或接收数据处理器113。虽然图10中示出了信道编码器、信道解码器，但是可以理解这些模块并不对本实施例构成限制性说明，仅是示意性的。
图11示出本实施例的另一种形式。处理装置120中包括调制子系统、中央处理子系统、周边子系统等模块。本实施例中的通信装置可以作为其中的调制子系统。具体的，该调制子系统可以包括处理器123，接口124。其中处理器123完成上述处理模块的功能，接口124完成上述收发模块的功能。作为另一种变形，该调制子系统包括存储器126、处理器123及存储在存储器126上并可在处理器上运行的程序，该处理器123执行该程序时实现上述方法实施例中终端设备侧的方法。需要注意的是，所述存储器126可以是非易失性的，也可以是易失性的，其位置可以位于调制子系统内部，也可以位于处理装置120中，只要该存储器126可以连接到所述处理器123即可。
本申请实施例还提供一种通信装置，该通信装置可以是网络设备。该通信装置可以用于执行上述图1～图7方法中由网络设备所执行的动作。
该通信装置包括：包括：收发模块，所述收发模块用于接收随机接入消息，所述随机接入消息包括第一指示信息；所述收发模块还用于响应所述第一指示信息发送第一配置，所述第一配置为广播多播MBS业务的配置。
本申请实施例，网络设备基于终端设备发送的请求，向终端设备发送MBS业务的配置，而不必按照预设的发送周期发送MBS业务的配置。因而，网络设备发送MBS业务具有时延短，发送灵活的特点。
本实施例所提供的通信装置，还可以用于执行上述图1～图7方法实施例任一可能的实现方式中的方法，具体内容可以参照图1～图7方法实施例中关于终端设备所执行动作的部分内容，此处不再赘述。
本申请实施例还提供一种通信装置，该通信装置可以是网络设备。该通信装置可以用于执行上述图8方法实施例中由网络设备所执行的动作。
该通信装置包括：包括：处理模块，用于生成广播多播MBS业务的第二配置，收发模块，用于发送广播多播MBS业务的第二配置，第二配置包括第二指示信息，所述第二指示信息用于指示所述广播多播MBS业务配置有业务连续性。
本申请实施例中，通过采用第二指示信息的方式，指示广播多播MBS业务是否配置有业务连续性。终端设备接收了配置有业务连续性的MBS业务，需要采取业务连续性保障机制。终端设备接收的MBS业务如果没有配置有业务连续性，则不需要采取业务连续性保障机制，从而在保障业务连续性的同时节约资源。
本实施例所提供的通信装置，还可以用于执行上述图8方法实施例任一可能的实现方式中的方法，具体内容可以参照图8方法实施例中关于终端设备所执行动作的部分内容，此处不再赘述。
本实施例中的通信装置为网络设备时，该网络设备可以如图12所示，装置130包括一个或多个射频单元，如远端射频单元(remote radio unit,RRU)1310和一个或多个基带单元1320 (baseband unit，BBU)，也可称为数字单元(digital unit，DU)。所述RRU 1310可以称为收发模块。可选地，该收发模块还可以称为收发机、收发电路、或者收发器等等，其可以包括至少一个天线1311和射频单元1312。所述RRU 1310部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于向终端设备发送指示信息。所述BBU 1310部分主要用于进行基带处理，对基站进行控制等。所述RRU 1310与BBU 1320可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 1320为基站的控制中心，也可以称为处理模块，可以与图8中的处理模块820对应，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理模块)可以用于控制基站执行上述方法实施例中关于网络设备的操作流程，例如，生成上述指示信息等。
在一个示例中，所述BBU 1320可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU 1320还包括存储器1321和处理器1322。所述存储器1321用以存储必要的指令和数据。所述处理器1322用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器1321和处理器1322可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (29)

  1. 一种通信方法，其特征在于，包括：
    发送随机接入消息，所述随机接入消息包括第一指示信息，所述第一指示信息用于请求广播多播MBS业务的第一配置；
    接收所述第一配置。
  2. 如权利要求1所述的方法，其特征在于，还包括：
    在第一小区接收所述广播多播MBS业务的第二配置；
    通过小区重选驻留于第二小区；
    所述发送随机接入消息包括，在所述第二小区发送所述随机接入消息。
  3. 如权利要求2所述的方法，其特征在于：
    所述第二配置包括所述第二指示信息，所述第二指示信息用于指示所述广播多播MBS业务配置有业务连续性；
    根据所述业务连续性，发送所述随机接入消息。
  4. 如权利要求2或3所述的方法，其特征在于：
    所述第二配置还包括所述广播多播MBS业务的标识信息。
  5. 如权利要求2～4任一项所述的方法，其特征在于，
    接收系统信息；
    根据所述系统信息确定是否发送所述随机接入消息。
  6. 如权利要求5所述的方法，其特征在于，根据所述系统信息确定是否发送随机接入消息包括：
    所述第二小区发送所述广播多播MBS业务的第三配置；
    根据所述系统信息确定接收所述第三配置的时间，根据所述时间确定是否发送所述随机接入消息。
  7. 如权利要求6所述的方法，其特征在于，包括：
    所述根据所述时间确定是否发送所述随机接入消息包括：确认接收所述第三配置的时间晚于接收所述第一配置的时间，发送所述随机接入消息。
  8. 如权利要求1-7任一项所述的方法，其特征在于：
    所述随机接入消息为随机接入消息3或者随机接入消息A。
  9. 如权利要求1-8任一项所述的方法，其特征在于，
    由终端设备发送所述随机接入消息，所述终端设备处于RRC空闲态或RRC非激活态。
  10. 一种通信方法，其特征在于，包括：
    接收随机接入消息，所述随机接入消息包括第一指示信息；
    响应于所述第一指示信息发送第一配置，所述第一配置为广播多播MBS业务的配置。
  11. 如权利要求10所述的方法，其特征在于：
    通过随机接入消息4发送所述第一配置，或者，通过随机接入消息B发送所述第一配置。
  12. 如权利要求10或11所述的方法，其特征在于：
    发送所述广播多播MBS业务的第三配置；
    发送系统信息，所述系统信息包括所述第三配置的发送周期和偏置。
  13. 一种通信装置，其特征在于，包括
    发送模块，用于发送随机接入消息，所述随机接入消息包括第一指示信息，所述第一指 示信息用于请求广播多播MBS业务的第一配置；
    接收模块用于接收所述第一配置。
  14. 如权利要求13所述的通信装置，其特征在于，包括：
    所述接收模块用于在第一小区接收所述广播多播MBS业务的第二配置；
    处理模块，用于选择第二小区作为所述通信装置的驻留小区，
    所述发送模块发送随机接入消息，包括，在所述第二小区发送所述随机接入消息。
  15. 如权利要求14所述的通信装置，其特征在于，
    所述第二配置包括所述第二指示信息，所述第二指示信息用于指示所述广播多播MBS业务配置有业务连续性；
    根据所述业务连续性，所述发送模块发送所述随机接入消息。
  16. 如权利要求14或15所述的通信装置，其特征在于，
    所述第二配置包括所述广播多播MBS业务的标识信息。
  17. 如权利要求14～16任一项所述的通信装置，其特征在于，
    所述接收模块接收系统信息，
    所述处理模块根据所述系统信息确定是否发送所述随机接入消息。
  18. 如权利要求17所述的通信装置，其特征在于，所述处理模块根据所述系统信息确定是否发送随机接入消息包括：
    所述第二小区发送所述广播多播MBS业务的第三配置；
    所述处理模块根据所述系统信息确定接收所述第三配置的时间，根据所述时间确定是否发送所述随机接入消息。
  19. 如权利要求18所述的通信装置，其特征在于，包括：
    所述处理模块根据所述时间确定是否发送所述随机接入消息包括：所述处理模块确认接收所述第三配置的时间晚于接收所述第一配置的时间，所述发送模块发送所述随机接入消息。
  20. 如权利要求13-19任一项所述的通信装置，其特征在于：
    所述随机接入消息为随机接入消息3或者随机接入消息A。
  21. 如权利要求13-20任一项所述的通信装置，其特征在于，
    所述通信装置处于RRC空闲态或RRC非激活态。
  22. 一种通信装置，其特征在于，包括：
    接收模块，所述接收模块用于接收随机接入消息，所述随机接入消息包括第一指示信息；
    所述发送模块用于响应所述第一指示信息发送第一配置，所述第一配置为广播多播MBS业务的配置。
  23. 如权利要求22所述的通信装置，其特征在于，
    所述发送模块通过随机接入消息4发送所述第一配置，或者，通过随机接入消息B发送所述第一配置。
  24. 如权利要求22或23所述的通信装置，其特征在于，
    所述发送模块还用于发送所述广播多播MBS业务的第三配置；
    所述发送模块还用于发送系统信息，所述系统信息包括所述第三配置的发送周期和偏置。
  25. 一种通信装置，其特征在于，包括：
    收发器和处理器，所述收发器用于执行接收和发送信息的指令，所述指令被所述处理器运行时，使得所述通信装置执行如权利要求1-12任一项所述的方法。
  26. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质上存储有指令， 当其在计算机上运行时，使得如权利要求1-12中任一项所述的方法被实现。
  27. 一种通信系统，包括权利要求13～21之一的通信装置和权利要求22～24之一的通信装置。
  28. 一种通信装置，包括处理器，所述处理器用于执行存储器存储的指令，使如权利要求1-12中任一项所述的方法被实现。
  29. 一种计算机程序产品，其特征在于，包含有指令，当其在计算机上运行时，使得如权利要求1-12中任一项所述的方法被实现。
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