CN111601231B - Multicast method and device based on position - Google Patents

Multicast method and device based on position Download PDF

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Publication number
CN111601231B
CN111601231B CN201910105247.2A CN201910105247A CN111601231B CN 111601231 B CN111601231 B CN 111601231B CN 201910105247 A CN201910105247 A CN 201910105247A CN 111601231 B CN111601231 B CN 111601231B
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control information
location
identifier
multicast service
multicast
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CN111601231A (en
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张伟
张锦芳
卢磊
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Chengdu Huawei Technology Co Ltd
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Chengdu Huawei Technology Co Ltd
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Priority to PCT/CN2020/073559 priority patent/WO2020156384A1/en
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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
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The embodiment of the application provides a multicast method and device based on positions, relates to the field of communication, and for example, relates to the fields of V2X, intelligent automobiles, automatic driving, Internet of vehicles or Internet driving and the like, and can improve the system efficiency in the multicast process and reduce the energy consumption of terminals. The method comprises the following steps: acquiring a group identifier corresponding to the multicast service; acquiring a position identifier of a position where the terminal equipment is located; receiving control information of the multicast service after scrambling; descrambling the control information of the scrambled multicast service by using the descrambling parameter to obtain first control information, wherein the first control information comprises a first position identifier; if the first position identification is the same as the position identification of the position where the terminal equipment is located, the terminal equipment receives multicast data of the multicast service at a time-frequency resource position indicated by the first control information; wherein, the descrambling parameter is the group identifier of the multicast service.

Description

Multicast method and device based on position
Technical Field
The present application relates to the field of communications, and in particular, to a location-based multicast method and apparatus.
Background
Wireless communication technology has experienced rapid development in the past decades, and has successively experienced a first generation wireless communication system based on an analog communication system, a 2G wireless communication system represented by a global system for mobile communication (GSM), a 3G wireless communication system represented by a Wideband Code Division Multiple Access (WCDMA), and then a Long Term Evolution (LTE) 4G wireless communication system. Services supported by wireless communication systems have also evolved from voice, short message service, to supporting wireless high-speed data communications. Meanwhile, the number of wireless connections worldwide is also continuously increasing at a high rate, and various new wireless service types are emerging in large numbers, such as internet of things, automatic driving, and the like, which all put higher demands on fifth generation mobile communication systems, i.e., New Radios (NR).
In NR-V2X (new radio-vehicle to updating), a group of users needs to acquire the same information in many scenarios. For example, vehicles at the same intersection may all need to download a real-time lane level high-definition map of the intersection, and the data that the vehicles at the same intersection need to acquire is the same. In this scenario, multicast techniques may be used to improve system efficiency. When multicast is used to transmit data to users, how to save system resources, improve system efficiency, simplify terminal actions and reduce terminal energy consumption is a problem to be considered.
Disclosure of Invention
The embodiment of the application provides a multicast method, device and system based on position, which can improve the system efficiency in the multicast process and reduce the energy consumption of terminals.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, the present application provides a location-based multicast method.
In one possible design, the method may include: acquiring a group identifier corresponding to the multicast service; acquiring a position identifier of a position where the terminal equipment is located; receiving control information of the multicast service after scrambling; descrambling the control information of the scrambled multicast service by using the descrambling parameter to obtain first control information; wherein, the descrambling parameter is a group identifier; the first control information comprises a first position identification; and if the first position identification is the same as the position identification of the position where the terminal equipment is located, receiving the multicast data of the multicast service at the time-frequency resource position indicated by the first control information.
In the method, the control information includes a location identifier, the terminal devices in different locations can determine corresponding control information according to the location identifier, and receive the multicast data of the multicast service at the time-frequency resource location indicated by the corresponding control information. Therefore, the terminal equipment can not only avoid adding a large amount of multicast services, but also avoid receiving a large amount of useless multicast data.
In a second aspect, the present application provides a location-based multicast method.
In one possible design, the method may include: acquiring a group identifier prefix corresponding to the multicast service; acquiring a position identifier of a position where the terminal equipment is located; receiving control information of the multicast service after scrambling; descrambling the control information of the scrambled multicast service by using the descrambling parameter to obtain first control information; the descrambling parameter is a group identifier, and the group identifier comprises a group identifier prefix and a position identifier of the position where the terminal equipment is located; and receiving the multicast data of the multicast service at the time-frequency resource position indicated by the first control information.
In the method, the scrambling parameter of the control information includes a position identifier, the terminal devices at different positions can determine the corresponding control information according to the position identifier, and receive the multicast data of the multicast service at the time-frequency resource position indicated by the corresponding control information. Therefore, the terminal equipment can not only avoid adding a large amount of multicast services, but also avoid receiving a large amount of useless multicast data.
With reference to the first aspect and the second aspect, in one possible design, the location identifier includes at least one of an area identifier and a direction identifier.
With reference to the first aspect and the second aspect, in one possible design, the control information includes downlink control information DCI or roadside control information SCI.
With reference to the first aspect and the second aspect, in one possible design, the group identity is a group radio network temporary identity G-RNTI.
In a third aspect, the present application provides a location-based multicast apparatus, which may implement the location-based multicast method described in the first aspect. For example, the apparatus may be a terminal device or a chip applied in the terminal device, and may also be other apparatuses capable of implementing the location-based multicast method, where the method may be implemented by software, hardware, or by executing corresponding software through hardware.
In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions in the method of the first aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.
In one possible design, the apparatus may include: the device comprises a processing module and a receiving module. The processing module is used for acquiring a group identifier corresponding to the multicast service; the processing module is further used for acquiring a position identifier of the position where the terminal equipment is located; a receiving module, configured to receive control information of the scrambled multicast service; the processing module is further used for descrambling the control information of the multicast service after scrambling by using the descrambling parameter to obtain first control information; wherein, the descrambling parameter is a group identifier; the first control information comprises a first position identification; the processing module is further used for determining whether the first position identifier is the same as the position identifier of the position where the terminal equipment is located; and the receiving module is further configured to receive the multicast data of the multicast service at the time-frequency resource location indicated by the first control information if the processing module determines that the first location identifier is the same as the location identifier of the location where the terminal device is located.
In a fourth aspect, the present application provides a location-based multicast apparatus, which may implement the location-based multicast method according to the second aspect. For example, the apparatus may be a terminal device or a chip applied in the terminal device, and may also be other apparatuses capable of implementing the location-based multicast method, where the method may be implemented by software, hardware, or by executing corresponding software through hardware.
In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions of the method of the second aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.
In one possible design, the apparatus may include: the device comprises a processing module and a receiving module. The processing module is used for acquiring a group identifier prefix corresponding to the multicast service; the processing module is further used for acquiring a position identifier of the position where the terminal equipment is located; a receiving module, configured to receive control information of the scrambled multicast service; the processing module is further used for descrambling the control information of the multicast service after scrambling by using the descrambling parameter to obtain first control information; the descrambling parameter is a group identifier, and the group identifier comprises a group identifier prefix and a position identifier of the position where the terminal equipment is located; and the receiving module is further configured to receive the multicast data of the multicast service at the time-frequency resource position indicated by the first control information.
With reference to the third aspect and the fourth aspect, in one possible design, the location indicator includes at least one of an area indicator and a direction indicator.
With reference to the third aspect and the fourth aspect, in one possible design, the control information includes downlink control information DCI or roadside control information SCI.
With reference to the third aspect and the fourth aspect, in one possible design, the group identity is a group radio network temporary identity G-RNTI.
In a fifth aspect, the present application provides a location-based multicast method.
In one possible design, the method may include: determining a group identifier corresponding to the multicast service; determining a position identification set of the multicast service, wherein the position identification set comprises a plurality of position identifications; scrambling first control information of the multicast service by using a scrambling parameter; the first control information comprises a first position identifier, and the first position identifier is one in a position identifier set; scrambling the second control information of the multicast service by using the scrambling parameter; the second control information comprises a second position identifier, and the second position identifier is one of the position identifier sets; wherein, the scrambling parameter is the group identification of the multicast service; the first location identity is different from the second location identity.
In the method, the control information of the multicast service includes a location identifier, the control information corresponding to the terminal devices at different locations is different, and the terminal devices can receive the multicast data of the multicast service at the time-frequency resource location indicated by the corresponding control information. Therefore, the terminal equipment can not only avoid adding a large amount of multicast services, but also avoid receiving a large amount of useless multicast data.
In a sixth aspect, the present application provides a location-based multicast method.
In one possible design, the method may include: determining a group identifier prefix corresponding to the multicast service; determining a position identification set of the multicast service, wherein the position identification set comprises a plurality of position identifications; scrambling first control information of the multicast service by using a first scrambling parameter; scrambling second control information of the multicast service by using a second scrambling parameter; the first scrambling parameter comprises a group identification prefix and a first position identification, and the first position identification is one of a position identification set; the second scrambling parameter comprises a group identifier prefix and a second position identifier, and the second position identifier is one of the position identifier set; the first location identity is different from the second location identity.
In the method, the scrambling parameter of the control information of the multicast service comprises a position identifier, the control information corresponding to terminal devices at different positions is different, and the terminal devices can receive the multicast data of the multicast service at the time-frequency resource position indicated by the corresponding control information. Therefore, the terminal equipment can not only avoid adding a large amount of multicast services, but also avoid receiving a large amount of useless multicast data.
With reference to the fifth aspect and the sixth aspect, in one possible design, the location indicator includes at least one of a region indicator and a direction indicator.
With reference to the fifth aspect and the sixth aspect, in one possible design, the control information includes downlink control information DCI or roadside control information SCI.
With reference to the fifth and sixth aspects, in one possible design, the group identity is a group radio network temporary identity G-RNTI.
In a seventh aspect, the present application provides a location-based multicast apparatus, which may implement the location-based multicast method according to the fifth aspect. For example, the apparatus may be a network device or a chip applied to a network device, or may be a road side device or a chip applied to a road side device, or may be another apparatus capable of implementing the above location-based multicast method, and it may implement the above method through software, hardware, or by executing corresponding software through hardware.
In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions of the method of the fifth aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.
In one possible design, the apparatus may include: the processing module is used for determining a group identifier corresponding to the multicast service; the method is also used for determining a position identification set of the multicast service, wherein the position identification set comprises a plurality of position identifications; the system is also used for scrambling the first control information of the multicast service by using the scrambling parameter; the first control information comprises a first position identifier, and the first position identifier is one in a position identifier set; the processing module is also used for scrambling the second control information of the multicast service by using the scrambling parameter; the second control information comprises a second position identifier, and the second position identifier is one of the position identifier sets; wherein, the scrambling parameter is the group identification of the multicast service; the first location identity is different from the second location identity.
In an eighth aspect, the present application provides a location-based multicast apparatus, which may implement the location-based multicast method according to the sixth aspect. For example, the apparatus may be a network device or a chip applied to a network device, or may be a road side device or a chip applied to a road side device, or may be another apparatus capable of implementing the above location-based multicast method, and it may implement the above method through software, hardware, or by executing corresponding software through hardware.
In one possible design, the apparatus may include a processor and a memory. The processor is configured to enable the apparatus to perform the corresponding functions in the above-mentioned method of the sixth aspect. The memory is for coupling to the processor and holds the necessary program instructions and data for the device. In addition, the device can also comprise a communication interface for supporting the communication between the device and other devices. The communication interface may be a transceiver or a transceiver circuit.
In one possible design, the apparatus may include: the processing module is used for determining a group identifier prefix corresponding to the multicast service; the method is also used for determining the position identification set of the multicast service; wherein the location identity set comprises a plurality of location identities; the processing module is also used for scrambling the first control information of the multicast service by using the first scrambling parameter; the processing module is also used for scrambling second control information of the multicast service by using a second scrambling parameter; the first scrambling parameter comprises a group identification prefix and a first position identification of the multicast service, and the first position identification is one of a position identification set; the second scrambling parameter comprises a group identification prefix and a second position identification of the multicast service, and the second position identification is one of the position identification set; the first location identity is different from the second location identity.
With reference to the seventh aspect and the eighth aspect, in one possible design, the location identifier includes at least one of an area identifier and a direction identifier.
With reference to the seventh aspect and the eighth aspect, in a possible design, the control information includes downlink control information DCI or roadside control information SCI.
With reference to the seventh aspect and the eighth aspect, in one possible design, the group identity is a group radio network temporary identity G-RNTI.
The present application also provides a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to perform the method of any of the above aspects.
The present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the above aspects.
The present application further provides a chip system, which includes a processor and a memory, and is configured to implement the method according to any one of the above aspects.
The present application provides a communication system, which includes the above-mentioned apparatus for implementing the location-based multicast method according to the first aspect or the second aspect, and the above-mentioned apparatus for implementing the location-based multicast method according to the fifth aspect or the sixth aspect.
Any one of the above-provided apparatuses, computer storage media, computer program products, chip systems, or communication systems is configured to execute the above-provided corresponding methods, and therefore, the beneficial effects that can be achieved by the apparatuses, the computer storage media, the computer program products, the chip systems, or the communication systems can refer to the beneficial effects of the corresponding schemes in the above-provided corresponding methods, and are not described herein again.
Drawings
Fig. 1 is a first schematic diagram of a system architecture to which the technical solution provided by the embodiment of the present application is applied;
fig. 2 is a second schematic diagram of a system architecture to which the technical solution provided by the embodiment of the present application is applied;
fig. 3 is a schematic hardware structure diagram of a communication device according to an embodiment of the present application;
fig. 4 is a schematic diagram of a location-based multicast method according to an embodiment of the present application;
fig. 5 is a schematic diagram of a method for determining an area identifier according to an embodiment of the present application;
fig. 6 is a first schematic structural diagram of a location-based multicast apparatus according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a location-based multicast apparatus according to an embodiment of the present application.
Detailed Description
A location-based multicast method, device and system provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
The technical scheme provided by the application can be applied to various mobile communication systems, such as a Long Term Evolution (LTE) system, a fifth generation mobile communication (5G) system, a future network and a home base station network; or a mobile network with non-third generation partnership project (3 GPP), such as wireless-fidelity (WIFI) access; a future evolution system or a plurality of communication convergence systems, etc. A variety of application scenarios may be included, for example, scenarios such as machine-to-machine (M2M), D2M, macro-micro communication, enhanced mobile internet (eMBB), ultra high reliability and low latency communication (URLLC), and mass internet of things communication (mtc), which may include but are not limited to: a communication scenario between a User Equipment (UE) and the UE, a communication scenario between a network device and the network device, a communication scenario between the network device and the UE, and the like.
The technical solution provided in the embodiment of the present application may be applied to a system architecture as shown in fig. 1, and the communication system may include a network device 100 and a UE 200.
The network device 100 may be a device capable of communicating with the UE 200. The network device 100 is mainly used for providing access services for the UE200, such as implementing functions of radio physical control, resource scheduling and radio resource management, radio access control, and mobility management. The network device 100 may be a Radio Access Network (RAN) device, such as a base station (nodeB, NB), AN evolved base station (eNB), or a 5G-AN/5G-RAN node, where the 5G-AN/5G-RAN node may be: an access node, a next generation base station (gNB), a Transmission Receive Point (TRP), a Transmission Point (TP), or some other access node. Specifically, the network device 100 corresponds to a service coverage area, and the UE200 entering the service coverage area may communicate with the network device 100 through a wireless signal to receive the wireless access service provided by the network device 100. The network device 100 may also be a relay station or an access point, etc.
The UE200 may be an access terminal, UE unit, UE station, mobile station, remote terminal, mobile device, UE terminal, wireless communication device, UE agent, or UE device, etc. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal in a 5G network or a terminal in a future evolved PLMN network, etc. In communication systems of different systems, UEs may be referred to differently, but may all be understood as UEs described in this application. The embodiment of the present application is also not particularly limited to the type of the UE.
In some scenarios, the communication system may further include a Road Side Unit (RSU) 300, and the RSU300 may be a terminal device providing the UE200 with assistance information. For example, the RSU300 may be an image processing device disposed on the roadside, and may collect road surface information in a certain area and transmit data of the road surface information to the UE 200.
It should be noted that the system architecture shown in fig. 1 is only for example and is not used to limit the technical solution of the present application. It will be understood by those skilled in the art that other devices may be included in the system architecture during implementation, and the number of network devices 100 and UEs 200 may be configured according to specific needs. For example, the system may further include a core network device, a data server, and the like. For example, the data server is used for providing multicast data of a multicast service. The network device may obtain the multicast data of the multicast service provided by the data server through the core network device.
In one example, the communication system is an NR-V2X network, and the network device 100 is a gNB in the NR-V2X network; the UE200 is a UE in an NR-V2X network, such as a vehicle mounted smart device; and a communication interface between the gNB and the UE is a Uu port. The UE may receive multicast, broadcast and multicast data from the gNB over the Uu port. The RSU300 is an RSU in an NR-V2X network, providing assistance information for the UE; the interface between the RSU and the UE is a Sidelink interface. The UE may also receive multicast, broadcast and multicast data from the RSU over the Sidelink interface.
Illustratively, as shown in fig. 2, the NR-V2X network includes a gNB100, a vehicle 201, a vehicle 202, a vehicle 203, a vehicle 204, a vehicle 205, a vehicle 206, a vehicle 207, a vehicle 208, a vehicle 209, and further includes an RSU 300. Vehicles 201-209 may all receive multicast data from either the gNB100 or the RSU 300.
For example, the network device 100, the UE200, or the RSU300 in fig. 1 or fig. 2 may be implemented by the communication device in fig. 3. Fig. 3 is a schematic diagram illustrating a hardware structure of a communication device according to an embodiment of the present application. The communication device 400 includes at least one processor 401, communication lines 402, memory 403 and at least one communication interface 404.
The processor 401 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure.
The communication link 402 may include a path for communicating information between the aforementioned components.
The communication interface 404, using any transceiver or the like, is used for communicating with other devices or communication networks.
The memory 403 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory 403, which may be separate, is coupled to the processor 401 via a communication line 402. The memory 403 may also be integrated with the processor 401.
The memory 403 is used for storing computer-executable instructions for executing the present invention, and is controlled by the processor 401. Processor 401 is configured to execute computer-executable instructions stored in memory 403 to implement the location-based multicast method provided by the embodiments described below in the present application.
Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.
In particular implementations, processor 401 may include one or more CPUs such as CPU0 and CPU1 in fig. 3, for example, as an example.
For one embodiment, the communication device 400 may include multiple processors, such as the processor 401 and the processor 407 in fig. 3. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
In particular implementations, communication device 400 may also include an output device 405 and an input device 406, as one embodiment. An output device 405 is in communication with the processor 401 and may display information in a variety of ways. For example, the output device 405 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, a projector (projector), or the like. The input device 406 is in communication with the processor 401 and may receive user input in a variety of ways. For example, the input device 206 may be a mouse, a keyboard, a touch screen device, or a sensing device, among others.
The communication device 400 described above may be a general purpose device or a special purpose device. In a specific implementation, the communication device 400 may be a desktop, a laptop, a web server, a Personal Digital Assistant (PDA), a mobile phone, a tablet, a wireless terminal device, an embedded device, or a device with a similar structure as in fig. 3. The embodiment of the present application does not limit the type of the communication apparatus 400.
Some of the terms referred to in this application are explained below:
1. multicast
In multicast transmission, one sender can transmit the same data to a plurality of receivers, and point-to-multipoint connections are made between the sender and the plurality of receivers.
A group of identical data corresponds to a multicast service. The user joins a multicast service, and can receive the multicast data of the multicast service transmitted by the sender.
2. Group identification
The group identifier is used for identifying the multicast service, and the group identifiers of different multicast services are different. For example, a user joins a multicast service, that is, can obtain a group identifier corresponding to the user.
3. The term "plurality" herein means two or more. The terms "first" and "second" herein are used to distinguish between different objects, and are not used to describe a particular order of objects. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In NR-V2X, a group of users may need to obtain the same data; another group of users needs to acquire another group of the same data. For example, in fig. 2, a vehicle 201, a vehicle 202, and a vehicle 203 need to acquire a lane-level high-definition map around the intersection 1; in fig. 2, a vehicle 206, a vehicle 207, and a vehicle 208 need to acquire a lane-level high-definition map around the intersection 4.
If each intersection is used as an independent multicast service, vehicles need to be added into a large number of multicast services in the driving process. For example, intersection 1 is set as multicast service 1, intersection 2 is set as multicast service 2, intersection 3 is set as multicast service 3, and intersection 4 is set as multicast service 4. The vehicle 202 passes through the intersection 1, the intersection 2 and the intersection 4, and then needs to be added into 3 multicast services; the vehicle 202 passes 10 intersections and needs to join 10 multicast services. Thus, the terminal device needs to analyze a large amount of control information of the multicast service, which affects the processing speed of the terminal device and is accompanied by high energy consumption of the terminal device. Moreover, the terminal device needs to perform frequent switching between different multicast services, which is time-consuming and complex in processing flow. Further, the terminal device needs to sign a contract when using the multicast service, and adds a large amount of multicast services, which involves a complicated signing process and has high operation complexity.
If a plurality of intersections are used as a multicast service, the vehicle can receive multicast data of the plurality of intersections regardless of the intersections, so that unnecessary data reception is caused, the processing speed of the terminal equipment is influenced, and the invalid energy consumption is accompanied.
The location-based multicast method provided by the embodiment of the present application may be applied to the communication system shown in fig. 1 or fig. 2. The terminal equipment can select to receive corresponding multicast data according to the position; the method is simple to implement, reduces the complexity of system implementation, improves the processing efficiency of the terminal equipment and reduces the energy consumption.
In this embodiment of the present application, the sending side of the multicast data may be a network device, for example, the network device 100 in fig. 1, or the gNB100 in fig. 2; other devices or apparatuses capable of sending multicast data for end devices are also possible, such as the RSU300 in fig. 1 or fig. 2. The receiving side of the multicast data may be any terminal device that needs to acquire the multicast data, such as the UE in fig. 1 or fig. 2. In the embodiments of the present application, a transmitting side of multicast data is taken as a network device, and a receiving side of multicast data is taken as a terminal device.
An embodiment of the present application provides a location-based multicast method, and as shown in fig. 4, the method may include S101 to S105:
s101, the terminal equipment joins in the multicast service.
When the terminal equipment needs to use the multicast service, the terminal equipment requests the network equipment to join the multicast service. For example, the multicast data of the multicast service 1 includes pedestrian information of an intersection, the multicast data of the multicast service 2 includes a road-level high-definition map of the intersection, and the multicast data of the multicast service 3 includes vehicle information of the intersection. In fig. 2, the vehicle 202 needs to acquire a road-level high-definition map, and requests the network device 100 to join the multicast service 2.
After receiving the request message of the terminal device, the network device determines a group identifier corresponding to the multicast service requested to be added by the terminal device. The group identifier is used to identify the multicast service. In one implementation, the network device assigns different group identifications to different multicast services. In another implementation, the network device obtains the group identifier of the multicast service from the core network device.
When joining the multicast service, the terminal device may obtain the group identifier corresponding to the multicast service from the network device. The terminal device obtains the group identifier of the multicast service, i.e. joins the multicast service. In one implementation, the group identity may be a group-radio network temporary identity (G-RNTI). The terminal device may obtain the G-RNTI corresponding to a multicast service when joining the multicast service.
In an implementation manner, when requesting to join a multicast service, a terminal device obtains a Temporary Multicast Group Identifier (TMGI) corresponding to the multicast service from a network device. For example, after receiving a request message for requesting a terminal device to join a multicast service, the network device may send a TMGI corresponding to the multicast service to the terminal device through a Radio Resource Control (RRC) message. Of course, the terminal device may also obtain the TMGI corresponding to the multicast service in other manners, for example, obtain the corresponding TMGI through the subscription information of the multicast service. This is not limited in the embodiments of the present application.
Further, the terminal equipment also acquires the corresponding relation between the TMGI and the G-RNTI from the network equipment so as to acquire the G-RNTI. For example, the network device sends multicast information of a multicast service in a cell to a terminal device in the cell, where the multicast information includes a correspondence between a TMGI and a G-RNTI. Illustratively, the network device sends single-cell multicast control channel (SC-MCCH) information to the terminal devices in a cell, where the SC-MCCH information includes TMGIs and G-RNTIs corresponding to each TMGI.
Exemplarily, one SC-MCCH information is as follows:
Figure BDA0001966569840000081
wherein, the MBMSSessioninfo corresponding to each G-RNTI (G-RNTI) comprises the corresponding TMGI (tmgi).
The terminal device may obtain the G-RNTI according to the TMGI and the correspondence between the TMGI and the G-RNTI.
In fig. 2, for example, a vehicle 201, a vehicle 202, a vehicle 203, a vehicle 204, a vehicle 205, a vehicle 206, a vehicle 207, a vehicle 208, and a vehicle 209 join the multicast service 2, respectively, and request to obtain a road level high-definition map.
The TMGI, the G-RNTI, and the correspondence between the TMGI and the G-RNTI may be determined by the network device according to the multicast service requested to be added by the terminal device, or may be determined by other devices in the network, which is not limited in this embodiment of the present application.
S102, the network equipment determines the position identification set of the multicast service.
For a multicast service, the multicast data corresponding to different positions are different. Illustratively, for the same multicast service, such as multicast service 2 (road level high-definition map), intersection 1, intersection 2, intersection 3, and intersection 4 in fig. 2 correspond to different multicast data, respectively. For another example, for the same multicast service, such as multicast service 2 (road level high-definition map), the four directions "east", "south", "west" and "north" in fig. 2 correspond to different multicast data respectively. Also exemplarily, for the same multicast service, such as multicast service 2 (road level high-definition map), in fig. 2, the four directions of "east", "south", "west", and "north" of intersection 1, the four directions of "east", "south", "west", and "north" of intersection 2, the four directions of "east", "south", "west", and "north" of intersection 3, and the four directions of "east", "south", "west", and "north" of intersection 4 correspond to different multicast data, respectively. In one implementation, the location identification is used to identify a location. The network equipment determines a position identification set of the multicast service requested to be added by the terminal equipment, wherein the position identification set comprises a plurality of position identifications.
In one implementation, the location identification is a region identification. The network device can divide the coverage area into different areas corresponding to different area identifications; when the terminal device is in different areas, different multicast data need to be acquired. For example, in fig. 2, intersection 1, intersection 2, intersection 3, and intersection 4 can be divided into 4 areas according to the positions on the planar map. If the vehicle 202 is at the intersection 1, a road level high-definition map of the intersection 1 needs to be acquired; if the vehicle 202 is traveling to intersection 2, a road level high-definition map of intersection 2 needs to be acquired.
Illustratively, the region identification y regional longitude modulo + x; where, x is FLOOR (longitude/area length) MOD regional longitude modulus, and y is FLOOR (latitude/area width) MOD regional latitude modulus. FLOOR represents rounding down, MOD represents complementation, FLOOR (longitude/regional length) MOD regional longitude modulus represents, and the quotient of longitude divided by regional length complements regional longitude modulus. The longitude and the latitude are the longitude and the latitude of the position where the terminal device is located. The region length and the region width are respectively the length and the width of one divided region. The area longitude modulus is the number of divided areas in the longitude direction; the area latitude modulus is the number of divided areas in the latitude direction.
In one implementation, the location identification is a direction identification. The network device assigns different direction identifications to different directions. Illustratively, the directions "east", "south", "west" and "north" correspond to the direction identifications 1, 2, 3 and 4, respectively.
In one implementation, the location identification includes an area identification and a direction identification. The network device can divide the coverage area into different areas corresponding to different area identifications; and within each region, different direction identifications are assigned to different directions.
It should be noted that, the sequence of S101 and S102 is not limited in the embodiment of the present application.
S103, the terminal equipment acquires the position identification of the position where the terminal equipment is located. In one implementation, the location identification is a region identification. When the terminal device is in different areas, different multicast data need to be acquired.
For example, the terminal device may obtain the longitude and latitude of the location through satellite positioning. And, the network device may send the area configuration information to the terminal device through a system message, a broadcast message, an RRC message, and other messages, where the area configuration information includes an area length, an area width, an area longitude modulus, and an area latitude modulus. Thus, the terminal device can acquire the zone length, the zone width, the zone longitude modulus, and the zone latitude modulus. And the terminal equipment determines the area identifier according to the longitude and latitude of the position, the area length, the area width, the area longitude modulus and the area latitude modulus.
For example, as shown in fig. 5, the vehicle 202 may obtain the longitude 120 degrees, 52 minutes and 10 seconds east longitude and the latitude 30 degrees, 50 minutes and 10 seconds north latitude by positioning. The network device (taking the base station as an example) performs area division, the area length of the base station is 100m, the area width is 100m, the area longitude modulus is 4, the area latitude modulus is 4, and 16 areas exist in the range of the base station. Further, the network device sends a system message to the terminal device, where the system message includes area configuration information, and the area configuration information includes an area length of 100m, an area width of 100m, an area longitude modulus of 4, and an area latitude modulus of 4. The terminal device obtains absolute position information according to the longitude and latitude of the satellite positioning, and then may determine that a is the terminal longitude position/100 m, and convert a into the range of the base station, and x is a mod 4, and similarly, may calculate that B is the terminal latitude position/100 m, and y is B mod 4. It is further determined that the area in which the vehicle 202 is located is identified as 4 x y + x.
In one implementation, the location identification is a direction identification. The terminal equipment is positioned in different directions and corresponds to different direction identifications; when the terminal device is in different directions, different multicast data need to be acquired. For example, in fig. 2, the traveling directions of the vehicle 202, the vehicle 205, the vehicle 206, and the vehicle 209 are "east"; the traveling directions of the vehicle 203, the vehicle 204, and the vehicle 208 are "west".
Illustratively, the directions "east", "south", "west" and "north" correspond to the direction identifications 1, 2, 3 and 4, respectively. The terminal equipment can determine the direction identifier according to the driving direction and the preset rule.
In one implementation, the location identification includes an area identification and a direction identification. The terminal devices in different areas correspond to different multicast data; and if the direction identifications of the terminal equipment in the same area are different, acquiring different multicast data. The terminal device may determine the area identifier and the direction identifier according to the method of the above embodiment, respectively, so as to determine the location identifier.
And S104, the network equipment sends the control information of the multicast service.
For a terminal device joining a multicast service, the multicast data of the multicast service may be acquired from a network device. The network device may indicate the time-frequency resource location for transmitting the multicast data by transmitting the control information. After receiving the control information, the terminal device may receive the multicast data of the multicast service at the time-frequency resource position indicated by the control information.
In one implementation, the control information is Downlink Control Information (DCI). For example, the network device may carry the DCI on a Physical Downlink Control Channel (PDCCH). The terminal device may obtain the DCI according to a preset rule. For example, the terminal device detects a PDCCH in a control channel resource set (core) according to the configured detection cycle or detection time, and acquires the DCI.
In the embodiments of the present application, the transmitting side is taken as a network device for example, but of course, the transmitting side may also be other devices or apparatuses. For example, in another implementation, if the transmitting side is the RSU, the control information may be roadside control information (SCI).
The control information sent by the network device to all the terminal devices joining the same multicast service is scrambled by adopting the same scrambling parameter. For example, the scrambling parameter may be a group identity of the multicast service. Illustratively, the scrambling parameter is the G-RNTI of the multicast service. And the network equipment sends the control information of the multicast service after scrambling to the terminal equipment.
Further, the control information contains a location identification. The position marks in the control information of the same multicast service are different, and the corresponding multicast data are different if the time-frequency resource positions indicated by the control information are different.
For example, scrambling first control information of the multicast service by using a scrambling parameter; the first control information comprises a first position identifier, and the first position identifier is one in a position identifier set; illustratively, the first location identity is the same as the location identity of the location where the first terminal device is located. Scrambling the second control information of the multicast service by using the scrambling parameter; the second control information comprises a second position identifier, and the second position identifier is one of the position identifier sets; illustratively, the second location identity is the same as the location identity of the location where the second terminal device is located. The first location identity is different from the second location identity and, correspondingly, the first control information is different from the second control information. The first terminal equipment receives multicast data at the time-frequency resource position indicated by the first control information, and the second terminal equipment receives the multicast data at the time-frequency resource position indicated by the second control information; in this way, the first terminal device and the second terminal device acquire different multicast data.
In one implementation, the location identification is a region identification. The network equipment divides different areas and corresponds to different area identifications; and if the terminal equipment is in different areas, the multicast data corresponding to the area identification can be acquired. For example, in fig. 2, intersection 1, intersection 2, intersection 3, and intersection 4 are divided into 4 areas according to the positions on the planar map.
Illustratively, the region identification y regional longitude modulo + x; where, x is FLOOR (longitude/area length) MOD regional longitude modulus, and y is FLOOR (latitude/area width) MOD regional latitude modulus. FLOOR represents rounding down, MOD represents complementation, FLOOR (longitude/regional length) MOD regional longitude modulus represents, and the quotient of longitude divided by regional length complements regional longitude modulus. The longitude and the latitude are the longitude and the latitude of the position where the terminal device is located. The region length and the region width are respectively the length and the width of one divided region. The area longitude modulus is the number of divided areas in the longitude direction; the area latitude modulus is the number of divided areas in the latitude direction.
For example, the network device obtains the longitude and latitude of the location of the terminal device according to the satellite positioning of the terminal device joining the multicast service. And the network equipment divides the area and determines the area length, the area width, the area longitude modulus and the area latitude modulus. Thus, the network device can determine the area identification of each area.
Illustratively, in fig. 2, intersection 1, intersection 2, intersection 3, and intersection 4 correspond to zone identifiers 1, 2, 3, and 4, respectively.
In one implementation, the location identification is a direction identification. For different directions, the network device determines different direction identifications. Illustratively, the directions "east", "south", "west" and "north" correspond to the direction identifications 1, 2, 3 and 4, respectively.
In one implementation, the location identification includes an area identification and a direction identification.
And S105, the terminal equipment receives the control information of the multicast service. And the terminal equipment joining the multicast service receives the scrambled control information of the multicast service, and the terminal equipment descrambles the scrambled control information of the multicast service by using the descrambling parameter to obtain the control information. The descrambling parameter and the scrambling parameter correspond to each other, for example, the scrambling parameter is a group identifier of the multicast service (for example, the group identifier is G-RNTI); the descrambling parameter is the group identity of the multicast service (illustratively, the group identity is G-RNTI). The control information includes a location identification.
The terminal device compares the location identity of the location where the terminal device is located with the location identity in the control information obtained from the network device. For example, the first control information sent by the network device includes a first location identifier, and the location identifier of the location where the terminal device is located is also the first location identifier, so that the terminal device determines that the multicast data corresponding to the first control information is multicast data corresponding to the location where the terminal device is located. And the terminal equipment receives the multicast data of the multicast service at the time-frequency resource position indicated by the first control information.
For example, the location identifier is an area identifier. Exemplarily, in fig. 2, a vehicle 201 — a vehicle 209 joins a multicast service 2, a network device 100 sends control information 1 of the multicast service 2, including an area identifier 1, sends control information 2 of the multicast service 2, including an area identifier 2, sends control information 3 of the multicast service 2, including an area identifier 3, and sends control information 4 of the multicast service 2, including an area identifier 4; control information 1, control information 2, control information 3, and control information 4 transmitted by the network device are scrambled using G-RNTI2, respectively. In fig. 2, the scrambled control information 1, control information 2, control information 3, and control information 4 are received by the vehicles 201 to 209, and the control information 1, control information 2, control information 3, and control information 4 are descrambled using the G-RNTI2, respectively, to obtain the control information 1, control information 2, control information 3, and control information 4. If the area identifier of the position where the vehicle 201, the vehicle 202 and the vehicle 203 determine is 1, and is the same as the area identifier 1 in the control information 1, the multicast data is received at the time-frequency resource position indicated by the control information 1; if the area identifier of the position where the vehicle 204 and the vehicle 205 determine is 2, and is the same as the area identifier 2 in the control information 2, the multicast data is received at the time-frequency resource position indicated by the control information 2; if the area identifier of the position where the vehicle 206, the vehicle 207 and the vehicle 208 are determined to be 3 is the same as the area identifier 3 in the control information 3, the multicast data is received at the time-frequency resource position indicated by the control information 3; if the area id of the location where the vehicle 209 determines is 4, which is the same as the area id 4 in the control information 4, the vehicle receives the multicast data in the time-frequency resource location indicated by the control information 4.
For example, the location identifier is a direction identifier. Exemplarily, in fig. 2, a vehicle 201 — a vehicle 209 joins a multicast service 2, a network device 100 sends control information 1 of the multicast service 2, which includes a direction identifier 1, sends control information 2 of the multicast service 2, which includes a direction identifier 2, sends control information 3 of the multicast service 2, which includes a direction identifier 3, and sends control information 4 of the multicast service 2, which includes a direction identifier 4; control information 1, control information 2, control information 3, and control information 4 transmitted by the network device are scrambled using G-RNTI2, respectively. In fig. 2, the scrambled control information 1, control information 2, control information 3, and control information 4 are received by the vehicles 201 to 209, and the control information 1, control information 2, control information 3, and control information 4 are descrambled using the G-RNTI2, respectively, to obtain the control information 1, control information 2, control information 3, and control information 4. If the vehicle 202, the vehicle 205, the vehicle 206 and the vehicle 209 determine that the driving direction is "east", the corresponding direction identifier is 1, and the corresponding direction identifier is the same as the direction identifier 1 in the control information 1, the multicast data is received at the time-frequency resource position indicated by the control information 1; if the vehicle 207 determines that the driving direction is "south", the corresponding direction identifier is 2, and the direction identifier is the same as the direction identifier 2 in the control information 2, the multicast data is received at the time-frequency resource position indicated by the control information 2; if the vehicle 203, the vehicle 204 and the vehicle 208 determine that the driving direction is "west", the corresponding direction identifier is 3, and the corresponding direction identifier is the same as the direction identifier 3 in the control information 3, the multicast data is received at the time-frequency resource position indicated by the control information 3; if the vehicle 201 determines that the driving direction is "north", the corresponding direction identifier is 4, and is the same as the direction identifier 4 in the control information 4, the multicast data is received at the time-frequency resource position indicated by the control information 4.
For example, the location identifier includes an area identifier and a direction identifier. For example, in fig. 2, a vehicle 201 — a vehicle 209 joins a multicast service 2, and the network device 100 sends control information 1 of the multicast service 2, which includes an area identifier 1 and a direction identifier 1; sending control information 2 of the multicast service 2, wherein the control information comprises an area identifier 1 and a direction identifier 3; sending control information 3 of the multicast service 2, wherein the control information comprises an area identifier 1 and a direction identifier 4; sending control information 4 of the multicast service 2, wherein the control information comprises an area identifier 2 and a direction identifier 1; sending control information 5 of the multicast service 2, wherein the control information comprises an area identifier 2 and a direction identifier 3; sending control information 6 of the multicast service 2, wherein the control information comprises an area identifier 3 and a direction identifier 1; sending control information 7 of the multicast service 2, wherein the control information comprises an area identifier 3 and a direction identifier 2; sending control information 8 of the multicast service 2, wherein the control information comprises an area identifier 3 and a direction identifier 3; sending control information 9 of the multicast service 2, wherein the control information comprises an area identifier 4 and a direction identifier 1; control information 1 to control information 9 transmitted by the network device are scrambled using G-RNTI2, respectively. In fig. 2, the vehicles 201 to 209 all receive the scrambled control information 1 to 9, descramble the control information 1 to 9 using the G-RNTI2, respectively, and acquire the control information 1 to 9. If the area identifier of the position where the vehicle 201 is determined to be is 1, the driving direction of the vehicle is north, the direction identifier is 4, and the area identifier is the same as the position identifier in the control information 3, the multicast data is received at the time-frequency resource position indicated by the control information 3; if the area identifier of the position where the vehicle 202 is located is 1, the driving direction of the vehicle is east, the direction identifier is 1, and the direction identifier is the same as the position identifier in the control information 1, the vehicle receives multicast data at the time-frequency resource position indicated by the control information 1; if the area identifier of the position where the vehicle 203 is located is 1, the driving direction is west, the direction identifier is 3, and the area identifier is the same as the position identifier in the control information 2, the vehicle receives the multicast data at the time-frequency resource position indicated by the control information 2; if the area identifier of the position where the vehicle 204 is located is 2, the driving direction is west, the direction identifier is 3, and the area identifier is the same as the position identifier in the control information 5, the multicast data is received at the time-frequency resource position indicated by the control information 5; if the area identifier of the position where the vehicle 205 is determined to be is 2, the driving direction of the vehicle is "east", the direction identifier is 1, and the area identifier is the same as the position identifier in the control information 4, the multicast data is received at the time-frequency resource position indicated by the control information 4; if the area identifier of the position where the vehicle 206 is located is 3, the driving direction is "east", the direction identifier is 1, and the area identifier is the same as the position identifier in the control information 6, the vehicle receives the multicast data at the time-frequency resource position indicated by the control information 6; if the area identifier of the position where the vehicle 207 is located is 3, the driving direction of the vehicle is south, the direction identifier of the vehicle is 2, and the area identifier is the same as the position identifier in the control information 7, the multicast data is received at the time-frequency resource position indicated by the control information 7; if the area identifier of the position where the vehicle 208 is located is 3, the driving direction of the vehicle is west, the direction identifier is 3, and the direction identifier is the same as the position identifier in the control information 8, the vehicle receives the multicast data at the time-frequency resource position indicated by the control information 8; if the area identifier of the position where the vehicle 209 determines is 4, the driving direction is "east", the direction identifier is 1, and the same as the position identifier in the control information 9, the multicast data is received at the time-frequency resource position indicated by the control information 9.
It should be noted that, the embodiment of the present application does not limit the order of executing the steps. For example, the terminal device obtains the location identifier of the location where the terminal device is located, and the location identifier may be executed before the terminal device receives the control information of the multicast service, or may be executed after the terminal device receives the control information of the multicast service; the sequence of each step does not affect the technical effect of the embodiment of the application.
In the location-based multicast method provided by the embodiment of the application, descrambling parameters of terminal devices which join a multicast service are the same, and location identifiers in control information corresponding to terminal devices at different locations are different; therefore, for terminal equipment joining a multicast service, terminal equipment in different positions receive different multicast data; different positions can be divided according to the regions and different positions can be divided according to the directions. Therefore, terminal equipment at different positions can join the same multicast service, and the terminal equipment is prevented from joining a large amount of multicast services; moreover, the terminal equipment at different positions acquires different multicast data, so that a large amount of useless multicast data is prevented from being received; the method is simple to implement, reduces energy consumption and can improve the processing speed of the terminal equipment.
The embodiment of the present application further provides a location-based multicast method, which may include S201 to S205:
s201, the terminal equipment joins in the multicast service.
The step S201 may refer to S101, and different from S101, in S201, when the terminal device joins the multicast service, the group identifier obtained from the network device is not a group identifier of the multicast service, but a group identifier prefix of the multicast service. After receiving the request message of the terminal device, the network device determines a group identifier prefix corresponding to the multicast service requested to be added by the terminal device. In one implementation, the network device assigns different group identifier prefixes to different multicast services. In another implementation, the network device obtains a group identifier prefix of the multicast service from the core network device. In an implementation manner, the group identifier may be a G-RNTI, and the terminal device may obtain a group identifier prefix G-RNTI-prefix corresponding to a multicast service when joining the multicast service. For example, when requesting to join a multicast service, the terminal device obtains the TMGI corresponding to the multicast service from the network device, and further, the terminal device obtains a corresponding relationship between the TMGI and the G-RNTI-prefix from the network device, thereby obtaining the G-RNTI-prefix.
S202, the network equipment determines the position identification set of the multicast service.
S102 may be referred to as a specific step of S202, and details are not repeated here.
S203, the terminal device obtains the position identification of the position where the terminal device is located.
S103 may be referred to as a specific step of S203, and details are not repeated here.
And S204, the network equipment sends the control information of the multicast service.
For a terminal device joining a multicast service, the multicast data of the multicast service may be acquired from a network device. The network device may indicate the time-frequency resource location for transmitting the multicast data by transmitting the control information. After receiving the control information, the terminal device may receive the multicast data of the multicast service at the time-frequency resource position indicated by the control information. In one implementation, the control information is downlink control information DCI. In another implementation, the transmitting side is the RSU, and the control information may be the SCI. For the description of the control information, reference may be made to S104, which is not described herein again.
The control information sent by the network device to all the terminal devices joining the same multicast service is scrambled by using the scrambling parameters respectively. For example, the scrambling parameter may be a group identity of the multicast service. Illustratively, the scrambling parameter is the G-RNTI of the multicast service. And the network equipment sends the control information of the multicast service after scrambling to the terminal equipment.
In one implementation, the group identification includes a location identification. If the scrambling parameters used by different control information of the same multicast service are different, the time-frequency resource positions indicated by the control information are different, and the corresponding multicast data are different. For example, the G-RNTI comprises a G-RNTI-prefix and a location identity.
In an exemplary manner, the first and second electrodes are,
g-RNTI definition example
G-RNTI::＝SEQUENCE{
g-RNTI-prefix BIT STRING(SIZE(13)),
zoneID INTERGER(0…7)
}
wherein g-RNTI-prefix is a group identifier prefix, and zoneID is a position identifier.
For example, the network device uses the first scrambling parameter to scramble the first control information of the multicast service; scrambling second control information of the multicast service by using a second scrambling parameter; the first scrambling parameter comprises a group identifier prefix and a first position identifier of the multicast service, the second scrambling parameter comprises a group identifier prefix and a second position identifier of the multicast service, the first position identifier is one of a position identifier set, the second position identifier is one of the position identifier set, and the first position identifier is different from the second position identifier; the first position identification is the same as the position identification of the position where the first terminal equipment is located, and the second position identification is the same as the position identification of the position where the second terminal equipment is located. The position mark of the position where the first terminal device is located is different from the position mark of the position where the second terminal device is located, correspondingly, the first scrambling parameter is different from the second scrambling parameter, and the first control information is different from the second control information. The first terminal equipment receives multicast data at the time-frequency resource position indicated by the first control information, and the second terminal equipment receives the multicast data at the time-frequency resource position indicated by the second control information; in this way, the first terminal device and the second terminal device acquire different multicast data.
For example, the location identifier is an area identifier. The network equipment divides different areas and corresponds to different area identifications; and if the terminal equipment is in different areas, the multicast data corresponding to the area identification can be acquired. For example, the location identifier is a direction identifier. For different directions, the network device determines different direction identifications. For example, the location identifier includes an area identifier and a direction identifier. For the description of the location identifier, reference may be made to S104, which is not described herein again.
And S205, the terminal equipment receives the control information of the multicast service.
And the terminal equipment joining the multicast service receives the scrambled control information of the multicast service. The terminal device descrambles the scrambled multicast service control information by using the descrambling parameter, and if the descrambling is successful, the control information is obtained, and then the multicast data of the multicast service is received at the time-frequency resource position indicated by the control information. The descrambling parameter and the scrambling parameter correspond to each other, for example, the scrambling parameter is a group identifier of the multicast service (for example, the group identifier is G-RNTI); the descrambling parameter is the group identity of the multicast service (illustratively, the group identity is G-RNTI). When the descrambling parameter is the same as the scrambling parameter, the terminal device can descramble successfully.
The scrambling parameter used by the network equipment for scrambling the control information is a group identifier, wherein the group identifier comprises a group identifier prefix and a position identifier. And the terminal equipment determines descrambling parameters according to the acquired group identifier prefix and the position identifier of the position where the group identifier prefix is located, descrambles the scrambled multicast service control information by using the descrambling parameters, and if the descrambling parameters are the same as the scrambling parameters, the descrambling is successful and the control information is obtained. For example, the terminal device descrambles the control information of the multicast service that is scrambled using the descrambling parameter, and if the descrambling is successful, and the first control information is obtained, then the terminal device receives the multicast data of the multicast service at the time-frequency resource position indicated by the first control information.
For example, the location identifier is an area identifier. Illustratively, in fig. 2, a vehicle 201 — a vehicle 209 joins a multicast service 2, and the network device 100 sends control information 1 of the multicast service 2, where a scrambling parameter of the control information 1 is G-RNTI-prefix + area identifier 1; sending control information 2 of the multicast service 2, wherein the scrambling parameter of the control information 2 is G-RNTI-prefix + area identification 2; sending control information 3 of the multicast service 2, wherein the scrambling parameter of the control information 3 is G-RNTI-prefix + area identification 3; and sending control information 4 of the multicast service 2, wherein the scrambling parameter of the control information 4 is G-RNTI-prefix + region identification 4. In fig. 2, the scrambled control information 1, control information 2, control information 3, and control information 4 are received by the vehicles 201 to 209. The area identifier of the position where the vehicle 201, the vehicle 202 and the vehicle 203 are determined to be 1, the descrambling parameter is determined to be G-RNTI-prefix + area identifier 1, the scrambling parameter is the same as the scrambling parameter of the control information 1, the scrambled control information 1 can be descrambled successfully, the control information 1 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 1. The area identifier of the position where the vehicle 204 and the vehicle 205 are determined to be 2, the descrambling parameter is determined to be G-RNTI-prefix + area identifier 2, the scrambling parameter is the same as the scrambling parameter of the control information 2, the scrambled control information 2 can be descrambled successfully, the control information 2 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 2. The area identifier of the position where the vehicle 206, the vehicle 207 and the vehicle 208 are determined to be 3, the descrambling parameter is determined to be G-RNTI-prefix + area identifier 3, the scrambling parameter is the same as the scrambling parameter of the control information 3, the scrambled control information 3 can be descrambled successfully, the control information 3 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 3. The area identifier of the position where the vehicle 209 is determined to be 4, the descrambling parameter is determined to be G-RNTI-prefix + area identifier 4, the scrambling parameter is the same as the scrambling parameter in the control information 4, the scrambled control information 4 can be descrambled successfully, the control information 4 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 4.
For example, the location identifier is a direction identifier. Illustratively, in fig. 2, a vehicle 201-a vehicle 209 joins a multicast service 2, and a network device 100 sends control information 1 of the multicast service 2, where a scrambling parameter of the control information 1 is G-RNTI-prefix + direction identifier 1; sending control information 2 of the multicast service 2, wherein the scrambling parameter of the control information 2 is G-RNTI-prefix + direction identification 2; sending control information 3 of the multicast service 2, wherein the scrambling parameter of the control information 3 is G-RNTI-prefix + direction identification 3; and sending control information 4 of the multicast service 2, wherein the scrambling parameter of the control information 4 is G-RNTI-prefix + direction identification 4. In fig. 2, the scrambled control information 1, control information 2, control information 3, and control information 4 are received by the vehicles 201 to 209. The vehicle 202, the vehicle 205, the vehicle 206 and the vehicle 209 determine that the driving direction is "east", the corresponding direction identifier is 1, and determine that the descrambling parameter is G-RNTI-prefix + direction identifier 1, which is the same as the scrambling parameter of the control information 1, and can successfully descramble the scrambled control information 1 to obtain the control information 1, then receive the multicast data at the time-frequency resource position indicated by the control information 1. The vehicle 207 determines that the driving direction is south, the corresponding direction identifier is 2, the descrambling parameter is G-RNTI-prefix + direction identifier 2, the scrambling parameter is the same as the scrambling parameter of the control information 2, the scrambled control information 2 can be descrambled successfully, the control information 2 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 2. The vehicle 203, the vehicle 204 and the vehicle 208 determine that the driving direction is "west", the corresponding direction identifier is 3, and determine that the descrambling parameter is G-RNTI-prefix + direction identifier 3, which is the same as the scrambling parameter of the control information 3, and can successfully descramble the scrambled control information 3 to obtain the control information 3, then the multicast data is received at the time-frequency resource position indicated by the control information 3. The vehicle 201 determines that the driving direction is north, the corresponding direction identifier is 4, and determines that the descrambling parameter is G-RNTI-prefix + direction identifier 4, which is the same as the scrambling parameter in the control information 4, and can successfully descramble the scrambled control information 4 to obtain the control information 4, and then receives the multicast data at the time-frequency resource position indicated by the control information 4.
For example, the location identifier includes an area identifier and a direction identifier. Exemplarily, in fig. 2, a vehicle 201 — a vehicle 209 joins a multicast service 2, and a network device 100 sends control information 1 of the multicast service 2, where scrambling parameters of the control information 1 are G-RNTI-prefix + area identifier 1+ direction identifier 1; sending control information 2 of a multicast service 2, wherein scrambling parameters of the control information 2 are G-RNTI-prefix + region identification 1+ direction identification 3; sending control information 3 of the multicast service 2, wherein scrambling parameters of the control information 3 are G-RNTI-prefix + region identification 1+ direction identification 4; sending control information 4 of the multicast service 2, wherein the scrambling parameter of the control information 4 is G-RNTI-prefix + region identification 2+ direction identification 1; sending control information 5 of the multicast service 2, wherein scrambling parameters of the control information 5 are G-RNTI-prefix + region identification 2+ direction identification 3; sending control information 6 of the multicast service 2, wherein scrambling parameters of the control information 6 are G-RNTI-prefix + region identification 3+ direction identification 1; sending control information 7 of the multicast service 2, wherein scrambling parameters of the control information 7 are G-RNTI-prefix + region identification 3+ direction identification 2; sending control information 8 of the multicast service 2, wherein scrambling parameters of the control information 8 are G-RNTI-prefix + region identification 3+ direction identification 3; and sending control information 9 of the multicast service 2, wherein the scrambling parameter of the control information 9 is G-RNTI-prefix + region identification 4+ direction identification 1. In fig. 2, the vehicles 201 to 209 all receive the scrambled control information 1 to 9. The area identifier of the position where the vehicle 201 is determined to be 1, the driving direction of the vehicle is north, the direction identifier is 4, the descrambling parameter is G-RNTI-prefix + area identifier 1+ direction identifier 4, the descrambling parameter is the same as the scrambling parameter of the control information 3, the scrambled control information 3 can be descrambled successfully, the control information 3 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 3. The area identifier of the position where the vehicle 202 is determined to be 1, the driving direction of the vehicle is east, the direction identifier is 1, the descrambling parameter is G-RNTI-prefix + area identifier 1+ direction identifier 1, the descrambling parameter is the same as the scrambling parameter of the control information 1, the scrambled control information 1 can be descrambled successfully, the control information 1 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 1. The area identifier of the position where the vehicle 203 is determined to be 1, the driving direction of the vehicle is west, the direction identifier is 3, the descrambling parameter is G-RNTI-prefix + area identifier 1+ direction identifier 3, the descrambling parameter is the same as the scrambling parameter of the control information 2, the scrambled control information 2 can be descrambled successfully, the control information 2 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 2. The area identifier of the position where the vehicle 204 is determined to be 2, the driving direction of the vehicle is west, the direction identifier is 3, the descrambling parameter is G-RNTI-prefix + area identifier 2+ direction identifier 3, the descrambling parameter is the same as the scrambling parameter of the control information 5, the scrambled control information 5 can be descrambled successfully, the control information 5 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 5. The area identifier of the position where the vehicle 205 is determined to be 2, the driving direction of the vehicle is east, the direction identifier is 1, the descrambling parameter is G-RNTI-prefix + area identifier 2+ direction identifier 1, the descrambling parameter is the same as the scrambling parameter of the control information 4, the scrambled control information 4 can be descrambled successfully, the control information 4 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 4. The area identifier of the position where the vehicle 206 is determined to be 3, the driving direction of the vehicle is east, the direction identifier is 1, the descrambling parameter is G-RNTI-prefix + area identifier 3+ direction identifier 1, the descrambling parameter is the same as the scrambling parameter of the control information 6, the scrambled control information 6 can be descrambled successfully, the control information 6 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 6. The area identifier of the position where the vehicle 207 is determined to be 3, the driving direction of the vehicle is south, the direction identifier is 2, the descrambling parameter is G-RNTI-prefix + area identifier 3+ direction identifier 2, the descrambling parameter is the same as the scrambling parameter of the control information 7, the scrambled control information 7 can be descrambled successfully, the control information 7 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 7. The area identifier of the position where the vehicle 208 is determined to be 3, the driving direction of the vehicle is west, the direction identifier is 3, the descrambling parameter is G-RNTI-prefix + area identifier 3+ direction identifier 3, the descrambling parameter is the same as the scrambling parameter of the control information 8, the scrambled control information 8 can be descrambled successfully, the control information 8 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 8. The area identifier of the position where the vehicle 209 is determined to be 4, the driving direction of the vehicle is east, the direction identifier is 1, the descrambling parameter is G-RNTI-prefix + area identifier 4+ direction identifier 1, the descrambling parameter is the same as the scrambling parameter of the control information 9, the scrambled control information 9 can be descrambled successfully, the control information 9 is obtained, and then the multicast data is received at the time-frequency resource position indicated by the control information 9.
It should be noted that, the embodiment of the present application does not limit the order of executing the steps. For example, the terminal device obtains the location identifier of the location where the terminal device is located, and the location identifier may be executed before the terminal device receives the control information of the multicast service, or may be executed after the terminal device receives the control information of the multicast service; the sequence of each step does not affect the technical effect of the embodiment of the application.
In the location-based multicast method provided by the embodiment of the application, terminal devices in different locations, which join a multicast service, have different corresponding descrambling parameters, that is, have different location identifiers contained in the descrambling parameters, and correspondingly obtain different control information; therefore, for terminal equipment joining a multicast service, terminal equipment in different positions receive different multicast data; different positions can be divided according to the regions and different positions can be divided according to the directions. Therefore, terminal equipment at different positions can join the same multicast service, and the terminal equipment is prevented from joining a large amount of multicast services; moreover, the terminal equipment at different positions acquires different multicast data, so that a large amount of useless multicast data is prevented from being received; the method is simple to implement, reduces energy consumption and can improve the processing speed of the terminal equipment.
The scheme provided by the embodiment of the application is introduced mainly from the interaction angle of the network device (or road side device) and the terminal device. It is understood that the network device (or roadside device) and the terminal device, in order to implement the above functions, include corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiment of the present application, the network device (or the roadside device) and the terminal device may be divided into functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The following description will be given taking the example of dividing each functional module corresponding to each function.
Fig. 6 is a schematic logical structure diagram of an apparatus 600 provided in the embodiment of the present application, where the apparatus 600 may be a terminal device and can implement the function of the terminal device in the method provided in the embodiment of the present application; the apparatus 600 may also be an apparatus capable of supporting the terminal device to implement the function of the terminal device in the method provided in the embodiment of the present application. The apparatus 600 may be a hardware structure, a software module, or a hardware structure plus a software module. The apparatus 600 may be implemented by a system-on-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in fig. 6, the apparatus 600 includes a processing module 601 and a receiving module 602. The processing module 601 may be used to perform S101, S103 in fig. 4, and/or perform other steps described in this application. The receiving module 602 may be configured to perform S105 in fig. 4, and/or perform other steps described in this application.
All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
Fig. 7 is a schematic logical structure diagram of an apparatus 700 provided in this embodiment of the present application, where the apparatus 700 may be a network device and can implement the functions of the network device in the method provided in this embodiment of the present application; the apparatus 700 may also be an apparatus capable of supporting a network device to implement the functions of the network device in the method provided by the embodiment of the present application; the device 700 may also be a road side device, which can implement the function of the road side device in the method provided by the embodiment of the present application; the apparatus 700 may also be an apparatus capable of supporting the roadside device to implement the function of the roadside device in the method provided by the embodiment of the application. The apparatus 700 may be a hardware structure, a software module, or a hardware structure plus a software module. The apparatus 700 may be implemented by a system-on-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. As shown in fig. 7, the apparatus 700 includes a processing module 701 and a transmitting module 702. The processing module 701 may be used to perform S101, S102 in fig. 4, and/or perform other steps described herein. The sending module 702 may be configured to perform S104 in fig. 4, and/or perform other steps described herein.
All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
In the present embodiment, the apparatus 600 or 700 may be presented in a form of dividing each functional module in an integrated manner. A "module" herein may refer to a particular ASIC, a circuit, a processor and a memory device executing one or more software or firmware programs, an integrated logic circuit, and/or other components that can provide the described functionality.
In some embodiments, device 600 or device 700 may take the form shown in fig. 3. For example, processor 401 in fig. 3 may cause apparatus 600 or apparatus 700 to perform the location-based multicast method in the above-described method embodiments by invoking a computer executing instructions stored in memory 403.
Specifically, the processing module 601 in fig. 6 or the processing module 701 in fig. 7 may be implemented by the processor 401 or the processor 407 in fig. 3, and the receiving module 602 in fig. 6 or the sending module 702 in fig. 7 may be implemented by the communication interface 404 in fig. 3.
Since the apparatus provided in the embodiment of the present application may be configured to execute the location-based multicast method, the technical effect obtained by the apparatus may refer to the method embodiment, and will not be described herein again.
It will be apparent to those skilled in the art that all or part of the steps of the above method may be performed by hardware associated with program instructions, and the program may be stored in a computer readable storage medium such as ROM, RAM, optical disk, etc.
The embodiment of the present application also provides a storage medium, which may include a memory 403.
For the explanation and beneficial effects of the related content in any one of the above-mentioned apparatuses, reference may be made to the corresponding method embodiments provided above, and details are not repeated here.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the present application are all or partially generated upon loading and execution of computer program instructions on a computer. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., Digital Video Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (20)

1. A method for location-based multicasting, the method comprising:
acquiring a group identifier corresponding to the multicast service;
acquiring a position identifier of a position where the terminal equipment is located;
receiving control information of the multicast service after scrambling;
descrambling the control information of the scrambled multicast service by using descrambling parameters to obtain first control information; wherein the descrambling parameter is the group identifier; the first control information comprises a first position identification;
and if the first position identifier is the same as the position identifier of the position where the terminal equipment is located, receiving first multicast data corresponding to the first position identifier in the multicast service at a time-frequency resource position indicated by the first control information.
2. A method for location-based multicasting, the method comprising:
acquiring a group identifier prefix corresponding to the multicast service;
acquiring a position identifier of a position where the terminal equipment is located;
receiving control information of the multicast service after scrambling;
descrambling the control information of the scrambled multicast service by using descrambling parameters to obtain first control information; the descrambling parameter is a group identifier, and the group identifier comprises the group identifier prefix and a position identifier of the position where the terminal equipment is located;
and receiving first multicast data corresponding to the position identifier of the position where the terminal equipment is located in the multicast service at the time-frequency resource position indicated by the first control information.
3. The method of claim 1 or 2, wherein the location identity comprises at least one of a region identity and a direction identity.
4. The method according to claim 1 or 2, wherein the control information comprises downlink control information DCI or roadside control information SCI.
5. The method according to claim 1 or 2, wherein the group identity is a group radio network temporary identity, G-RNTI.
6. A method for location-based multicasting, the method comprising:
determining a group identifier corresponding to the multicast service;
determining a position identification set of the multicast service; the set of location identifications comprises a plurality of location identifications;
scrambling the first control information of the multicast service by using a scrambling parameter; the first control information comprises a first position identifier, and the first position identifier is one of the position identifier sets;
scrambling the second control information of the multicast service by using the scrambling parameter; the second control information comprises a second location identifier, and the second location identifier is one of the location identifier sets;
wherein the scrambling parameter is the group identity; the first location identity is different from the second location identity;
sending first multicast data corresponding to the first location identifier in the multicast service at a time-frequency resource location indicated by the first control information;
and sending second multicast data corresponding to the second position identifier in the multicast service at the time-frequency resource position indicated by the second control information.
7. A method for location-based multicasting, the method comprising:
determining a group identifier prefix corresponding to the multicast service;
determining a position identification set of the multicast service; the set of location identifications comprises a plurality of location identifications;
scrambling first control information of the multicast service by using a first scrambling parameter;
scrambling second control information of the multicast service by using a second scrambling parameter;
wherein the first scrambling parameter comprises the group identity prefix and a first location identity, the first location identity being one of the set of location identities; the second scrambling parameter comprises the group identity prefix and a second location identity, the second location identity being one of the set of location identities; the first location identity is different from the second location identity;
sending first multicast data corresponding to the first location identifier in the multicast service at a time-frequency resource location indicated by the first control information;
and sending second multicast data corresponding to the second position identifier in the multicast service at the time-frequency resource position indicated by the second control information.
8. The method of claim 6 or 7, wherein the location indicator comprises at least one of a region indicator and a direction indicator.
9. The method according to claim 6 or 7, wherein the control information comprises downlink control information DCI or roadside control information SCI.
10. The method of claim 6, wherein the group identity is a group radio network temporary identity (G-RNTI).
11. A location-based multicast apparatus, comprising:
the processing module is used for acquiring a group identifier corresponding to the multicast service;
the processing module is further configured to obtain a location identifier of a location where the terminal device is located;
a receiving module, configured to receive control information of the multicast service subjected to scrambling;
the processing module is further configured to descramble the scrambled control information of the multicast service by using a descrambling parameter to obtain first control information; wherein the descrambling parameter is the group identifier; the first control information comprises a first position identification;
the processing module is further configured to determine whether the first location identifier is the same as a location identifier of a location where the terminal device is located;
the receiving module is further configured to receive, at a time-frequency resource location indicated by the first control information, first multicast data corresponding to the first location identifier in the multicast service if the processing module determines that the first location identifier is the same as the location identifier of the location where the terminal device is located.
12. A location-based multicast apparatus, comprising:
the processing module is used for acquiring a group identifier prefix corresponding to the multicast service;
the processing module is further configured to obtain a location identifier of a location where the terminal device is located;
a receiving module, configured to receive control information of the multicast service subjected to scrambling;
the processing module is further configured to descramble the scrambled control information of the multicast service by using a descrambling parameter to obtain first control information; the descrambling parameter is a group identifier, and the group identifier comprises the group identifier prefix and a position identifier of the position where the terminal equipment is located;
the receiving module is further configured to receive, at the time-frequency resource location indicated by the first control information, first multicast data corresponding to the location identifier of the location where the terminal device is located in the multicast service.
13. The apparatus of claim 11 or 12, wherein the location indicator comprises at least one of a region indicator and a direction indicator.
14. The apparatus according to claim 11 or 12, wherein the control information comprises downlink control information DCI or roadside control information SCI.
15. The apparatus according to claim 11 or 12, wherein the group identity is a group radio network temporary identity, G-RNTI.
16. A location-based multicast apparatus, comprising:
the processing module is used for determining a group identifier corresponding to the multicast service;
the processing module is further configured to determine a location identifier set of the multicast service; the set of location identifications comprises a plurality of location identifications;
the processing module is further configured to scramble the first control information of the multicast service by using a scrambling parameter; the first control information comprises a first position identifier, and the first position identifier is one of the position identifier sets;
the processing module is further configured to scramble second control information of the multicast service by using a scrambling parameter; the second control information comprises a second location identifier, and the second location identifier is one of the location identifier sets;
wherein the scrambling parameter is the group identity; the first location identity is different from the second location identity;
a sending module, configured to send, in the time-frequency resource location indicated by the first control information, first multicast data corresponding to the first location identifier in the multicast service, and send, in the time-frequency resource location indicated by the second control information, second multicast data corresponding to the second location identifier in the multicast service.
17. A location-based multicast apparatus, comprising:
the processing module is used for determining a group identifier prefix corresponding to the multicast service;
the processing module is further configured to determine a location identifier set of the multicast service; the set of location identifications comprises a plurality of location identifications;
the processing module is further configured to scramble first control information of the multicast service using the first scrambling parameter;
the processing module is further configured to scramble second control information of the multicast service using a second scrambling parameter;
wherein the first scrambling parameter comprises the group identity prefix and a first location identity, the first location identity being one of the set of location identities; the second scrambling parameter comprises the group identity prefix and a second location identity, the second location identity being one of the set of location identities; the first location identity is different from the second location identity;
a sending module, configured to send, in the time-frequency resource location indicated by the first control information, first multicast data corresponding to the first location identifier in the multicast service, and send, in the time-frequency resource location indicated by the second control information, second multicast data corresponding to the second location identifier in the multicast service.
18. The apparatus of claim 16 or 17, wherein the location indicator comprises at least one of a region indicator and a direction indicator.
19. The apparatus according to claim 16 or 17, wherein the control information comprises downlink control information DCI or roadside control information SCI.
20. The apparatus of claim 16, wherein the group identity is a group radio network temporary identity (G-RNTI).
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