WO2013026374A1 - 数据传输方法和设备 - Google Patents

数据传输方法和设备 Download PDF

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Publication number
WO2013026374A1
WO2013026374A1 PCT/CN2012/080305 CN2012080305W WO2013026374A1 WO 2013026374 A1 WO2013026374 A1 WO 2013026374A1 CN 2012080305 W CN2012080305 W CN 2012080305W WO 2013026374 A1 WO2013026374 A1 WO 2013026374A1
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WO
WIPO (PCT)
Prior art keywords
terminal
base station
rnti
scheduling
message
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Application number
PCT/CN2012/080305
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English (en)
French (fr)
Inventor
张惠英
全海洋
阮航
Original Assignee
电信科学技术研究院
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Priority to US14/238,845 priority Critical patent/US20140233538A1/en
Priority to EP12825539.5A priority patent/EP2747508B1/en
Publication of WO2013026374A1 publication Critical patent/WO2013026374A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/12Wireless traffic scheduling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446Resources in time domain, e.g. slots or frames
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a data transmission method and device.
  • LTE Long Term Evolution
  • APN Access Point Name
  • P-GW Service Gateway Serving Gateway
  • MME Mobile Management Entity
  • eNB base station
  • UE User Equipment
  • the LTE system adopts a design method in which the user plane and the control plane are separated, and the control plane signaling and the user plane bearer are respectively responsible by independent network elements (ie, MME and S-GW).
  • MME Non-Access Stratum
  • S-GW is the gateway point for eNB handover, forwarding 2G / 3G and other system service data gateway points, and completes downlink data packet buffering, some initialization work, specified interception interception, packet routing and forwarding, and the like.
  • the P-GW is used for policy enforcement, packet filtering, specified interception, allocation of Internet Protocol (IP) addresses of the UE, charging functions, packet reproduction, and the like.
  • IP Internet Protocol
  • the control signaling between the UE, the eNB and the core network is processed by the MME; the user data is transmitted to the P-GW through the S-GW, and then transmitted by the P-GW to various external APN nodes. Since the coupling of control signaling and user data is reduced, when a new service occurs, only the network element responsible for the user plane is upgraded, and the control information transmission is not affected, thereby greatly reducing the complexity of network maintenance and Equipment upgrade costs.
  • Step 1 When the UE has data to be transmitted, firstly, according to the random access resource information configured by the system, wait for a random access channel (RACH) scheduling period, select a preamble code, and send the bearer to the eNB.
  • RACH random access channel
  • the random access request of the preamble code that is, the message (Message, Msg) 1.
  • Step 2 After receiving the Msgl sent by the UE, the eNB sends a random access response message to the UE in the random access response window, that is, sends the Msg2.
  • a random access response message may respond to random access requests of multiple UEs.
  • the Msg2 is scheduled by downlink control information (Downlink Control Information, DCI) scrambled by a random access radio network (Random Access-RNTI, RA-RNTI), and the RA-RNTI is determined by the time-frequency resource location of the Msgl.
  • DCI Downlink Control Information
  • RA-RNTI random access radio network
  • the contents of Msg2 include: a backoff parameter, a preamble code identifier corresponding to Msgl, Uplink Advance (TA), uplink resource (Msg3 scheduling information) allocated for Msg3, and Cell-Radio Network Temporary Identifier (C-RNTI).
  • the backoff parameter is used to indicate the average delay of the next time the UE initiates random access if the random access fails.
  • the UE determines the random access response sent to itself by using the preamble code identifier in the RA-RNTI and the Msg2.
  • the preamble code corresponding to the preamble code identifier in the Msg2 includes the preamble code in the random access request initiated by the UE, then The user successfully receives the random access response message, and then sends Msg3 to the network side. If the UE does not correctly receive the Msg2, the delay of the next random access is determined according to the delay limit of the backoff parameter, and the random access resource is selected to initiate the next random access. After the maximum number of random accesses is reached, the Medium Access Control (MAC) layer of the UE moves to the Radio Resource Control (RRC) layer and the random access problem triggers the radio link failure process.
  • RRC Radio Resource Control
  • Step 3 After receiving the Msg2, the UE sends the Msg3 on the uplink resource allocated by the Msg2.
  • Msg3 contains different content for different scenarios. For example, in the initial access, Msg3 carries an RRC connection reestablishment request message generated by the RRC layer.
  • Step 4 e B and UE complete the final competition resolution through Msg4.
  • the content in Msg4 corresponds to the content in Msg3.
  • the Msg4 carries the UE contention resolution identifier, that is, the MAC layer control unit (Contention Resolution Identity MAC CE), and the MAC CE includes the common control channel service data unit (Common Control Channel Service Data) transmitted by the UE in the Msg3. Unit, CCCH SDU), after receiving the MAC CE, the UE compares with its own RRC layer information to complete the contention resolution.
  • the Msg4 may include an RRC connection setup message, which is used to establish a Signaling Radio Bearer (SRB) 1 of the UE.
  • SRB Signaling Radio Bearer
  • Step 5 After completing the contention resolution, the UE establishes SRB1 according to the information in the RRC connection setup message, and sends an RRC connection setup complete message to the network side.
  • the NAS service request message can be sent to the network side when the RRC connection setup complete message is sent.
  • Step 6 After receiving the RRC connection setup complete message, the eNB sends the piggybacked NAS service request message to the MME, and is used to request the MME to establish a related connection between the eNB corresponding to the UE and the core network element, including the control plane of the MME. Connected to and communicate with the S-GW (Evolved Packet System Radio Access Bearer, E-RAB).
  • E-GW Evolved Packet System Radio Access Bearer
  • Step 7 The MME notifies the e B of the information corresponding to the UE connection.
  • Step 8 The eNB sends a Security Mode Command (SMC) and an RRC Connection Reconfiguration message to the UE. It is used to activate the security of the UE and establish a Data Radio Bearer (DRB) and other signaling radio bearers, SBR2, for the UE. It should be noted that the SMC and RRC connection reconfiguration can be sent in one RRC message or separately.
  • SMC Security Mode Command
  • RRC Connection Reconfiguration can be sent in one RRC message or separately.
  • Step 9 After the security activation and the DRB and SRB2 configuration are completed, the UE sends a security mode complete message and an RRC connection reconfiguration complete message to the network side.
  • Step 10 After the foregoing process, the user plane data of the UE is carried by the DRB and the SI, and is sent to the core network through the e B and the S-GW; the control signaling of the UE and the core network is controlled by the SRB and the eNB and the MME. The face connection is sent to the MME.
  • the UE For the UE in the detached state, when the UE needs to send data to the network side, the UE needs to initiate an attach process and attach to the network. In addition, in order to determine the legitimacy of the user, it is necessary to confirm through the authentication process. .
  • the signaling flow will be more complicated than the process shown in Figure 2 and will not be described in detail herein.
  • Machine-type communication is a new communication concept. Its purpose is to combine many different types of communication technologies, such as: machine-to-machine communication, machine control communication, human-computer interaction communication, mobile Connected communications to promote social production and lifestyle development. It is expected that the business of human-to-human communication in the future may only account for 1/3 of the entire terminal market, and a larger amount of communication is the MTC communication service. Sometimes MTC is also known as Machine-to-machine (M2M) communication or the Internet of Things.
  • M2M Machine-to-machine
  • MTC terminals have low mobility; the time for data transmission between the MTC terminal and the network side is controllable; the data transmission performed by the MTC terminal and the network side does not require high real-time performance. That is, it has time tolerance; the MTC terminal is limited in energy and requires extremely low power consumption; only small data volume information is transmitted between the MTC terminal and the network side; the MTC terminal can be managed in units of groups; An actual MTC terminal can have one or more of the features described above.
  • the number of MTC terminals will greatly exceed the number of traditional communication terminals, in many MTC application scenarios, there are some one-way downlink small data transmission, one-way uplink small data transmission, and small uplink/downlink interaction.
  • the amount of data transmitted each time is not very large (usually tens to hundreds of bytes), and one or several subframes can be transmitted.
  • the network side and the MTC terminal need to establish the DRB/RB and Sl/Iu bearer according to the signaling procedure shown in FIG. 2 according to the current data transmission mode, and then pass the DRB/RB, Sl/Iu.
  • the bearer transmits data, and the signaling procedure shown in FIG. 2 requires a large signaling overhead, thereby reducing system efficiency.
  • the embodiment of the invention provides a data transmission method and device, which are used to reduce signaling overhead of the system.
  • a data transmission method comprising:
  • the base station sends the scheduling radio network temporary identifier RNTI for scheduling the resource to the terminal;
  • the base station establishes a context for the terminal, and uses the physical downlink control channel PDCCH that is scrambled by the scheduling RNTI to schedule uplink resources and/or downlink resources for the terminal, and sends the terminal to the scheduled uplink resource.
  • the uplink data is sent downlink data to the terminal on the scheduled downlink resource.
  • a data transmission method comprising:
  • a scheduling radio network temporary identifier RNTI which is sent by the base station, for scheduling resources
  • the terminal monitors the physical downlink control channel PDCCH that is scrambled by using the scheduled RN, transmits uplink data by using the uplink resource scheduled by the monitored PDCCH, and/or receives downlink data by using the downlink resource scheduled by the monitored PDCCH.
  • PDCCH physical downlink control channel
  • a base station comprising:
  • An information processing unit configured to send a scheduling radio network temporary identifier RNTI for scheduling resources to a terminal, and a data transmission unit, configured to establish a context for the terminal by the base station, and perform physical downlink by using the scheduling RNTI according to the context
  • the control channel PDCCH is configured to allocate uplink resources and/or downlink resources for the terminal, and receive uplink data sent by the terminal on the scheduled uplink resource, and send downlink data to the terminal on the scheduled downlink resource.
  • a terminal comprising:
  • a processing unit configured to receive a scheduling radio network temporary identifier RNTI that is sent by the base station and used to schedule resources;
  • the transmitting unit is configured to monitor the physical downlink control channel PDCCH that is scrambled by using the scheduling RNTI, send uplink data by using the uplink resource scheduled by the monitored PDCCH, and/or receive downlink information by using the downlink resource scheduled by the monitored PDCCH. data.
  • the base station sends the scheduling RNTI to the terminal, uses the scheduling RNTI to schedule the uplink resource and/or the downlink resource, and receives the uplink data sent by the terminal on the scheduled uplink resource, where the scheduling is performed.
  • the downlink data is sent to the terminal on the downlink resource. It can be seen that, in this method, the base station can also perform uplink/downlink data transmission without establishing an RRC connection. Since the establishment of the RRC connection requires a large signaling overhead, the solution can effectively reduce the signaling overhead of the system.
  • the terminal receives the scheduled RNTI sent by the base station, and listens to the PDCCH scrambled by using the scheduled RNTI, and uses the resources scheduled by the monitored PDCCH to send uplink data and/or receive downlink data. It can be seen that, in this method, the terminal can also perform uplink/downlink data transmission without establishing an RRC connection, and a large signaling overhead is required for establishing an RRC connection. Therefore, the solution can effectively reduce the signaling overhead of the system.
  • FIG. 1 is a schematic diagram of a network architecture of an LTE system in the prior art
  • FIG. 2 is a schematic diagram of a connection/bearing establishment process of an LTE system in the prior art
  • FIG. 3 is a schematic flowchart of a method according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic diagram of another method according to an embodiment of the present invention.
  • FIG. 5A is a schematic flowchart of Embodiment 1 of the present invention.
  • FIG. 5B is a schematic flowchart of Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a device according to an embodiment of the present disclosure
  • FIG. 7 is a schematic structural diagram of another device according to an embodiment of the present invention.
  • the embodiment of the present invention provides a data transmission method, in which the base station sends a scheduled radio network temporary identifier (RNTI) to the terminal, and uses the scheduling RNTI to schedule the uplink resource for the terminal and/or Or the downlink resource, and receiving the uplink data sent by the terminal on the scheduled uplink resource, and sending the downlink data to the terminal on the scheduled downlink resource.
  • RNTI radio network temporary identifier
  • a data transmission method provided by an embodiment of the present invention includes the following steps:
  • Step 30 The base station sends the scheduling RNTI for scheduling the resource to the terminal.
  • the scheduling RNTI may be an existing RNTI such as a C-RNTI, or may be a newly defined RNTI.
  • Step 31 The base station establishes a context for the terminal, and uses the physical downlink control channel (PDCCH) that is scrambled by the scheduling RNTI to schedule uplink resources and/or downlink resources for the terminal, and sends the terminal to the scheduled uplink resource.
  • the uplink data is sent downlink data to the terminal on the scheduled downlink resource. Specifically, if the base station only schedules the downlink resource for the terminal, the base station sends the downlink data to the terminal by using the scheduled downlink resource. If the base station schedules the downlink resource and the uplink resource for the terminal, the base station sends the downlink data to the terminal by using the scheduled downlink resource, and The receiving terminal uses the uplink data sent by the scheduled uplink resource. If the base station only schedules the uplink resource, the base station receives the uplink data sent by the terminal using the scheduled uplink resource.
  • PDCCH physical downlink control channel
  • the base station sends the scheduling RNTI to the terminal, where the paging message carrying the scheduling RNTI is sent to the terminal after receiving the paging message of the core network device.
  • the base station in step 31, after the paging message is sent to the terminal, the base station establishes a context for the terminal according to the default configuration specified in the protocol RS36.331, and uses the PDCCH scrambled by using the scheduling RNTI according to the context.
  • the uplink resource and/or the downlink resource are scheduled, and the uplink data sent by the terminal is received on the scheduled uplink resource, and the downlink data is sent to the terminal on the scheduled downlink resource.
  • the base station sends the scheduling RNTI to the terminal, where the paging message carrying the scheduling RNTI is sent to the terminal after receiving the paging message of the core network device. Then, the base station receives the message 1 for requesting random access, and the message 1 carries a random access preamble code. The base station sends a message 2 for responding to the random access request to the terminal, where the message 2 carries the uplink TA. And a cell RNTI (C-RNTI); the base station receives the message 3 sent by the terminal and carries the scheduling RNTI.
  • C-RNTI cell RNTI
  • step 31 after receiving the message 3, the base station releases the cell RNTI carried in the message 2, establishes a context for the terminal according to the default configuration specified in the protocol RS36.331, and uses the scheduling RNTI according to the context.
  • the PDCCH is used to schedule the uplink resource and/or the downlink resource for the terminal, and receives the uplink data sent by the terminal on the scheduled uplink resource, and sends the downlink data to the terminal on the scheduled downlink resource.
  • the terminal after the terminal maintains uplink synchronization with the base station side according to the uplink TA, the terminal transmits uplink data to the base station.
  • the base station is configured according to the Buffer Status Report (BSR) carried in the message 3. If the information is determined by the terminal, the uplink data needs to be sent, and the uplink resource and the downlink resource are scheduled by the PDCCH that is scrambled by using the scheduling RNTI according to the context; otherwise, the PDCCH that is scrambled by using the scheduling RNTI is used as the terminal scheduling according to the context. Downstream resources.
  • the BSR information is information for indicating the amount of data of the uplink data that the terminal needs to transmit.
  • the base station sends the scheduling RNTI to the terminal, where the base station sends a paging message carrying the dedicated preamble code to the terminal after receiving the paging message of the core network device, where the base station sends the paging message carrying the dedicated preamble code to the terminal.
  • the preamble code is different from the preamble code for the terminal random access (that is, the random access preamble); the base station receives the message 1 for requesting random access sent by the terminal, and the message 1 carries the dedicated preamble code and sends the message to the terminal.
  • Message 2 for responding to a random access request, the message 2 carrying the scheduling RNTI.
  • the base station after receiving the message 2, the base station establishes a context for the terminal according to the default configuration specified in the protocol RS36.331, and schedules the uplink resource for the terminal by using the PDCCH scrambled by the scheduling RNTI according to the context. And/or the downlink resource, and receiving the uplink data sent by the terminal on the scheduled uplink resource, and sending the downlink data to the terminal on the scheduled downlink resource.
  • the base station sends the scheduling RNTI to the terminal, where the base station sends a paging message carrying the dedicated preamble code to the terminal after receiving the paging message of the core network device.
  • the preamble code is different from the preamble code for the terminal random access (that is, the random access preamble); the base station receives the message 1 for requesting random access sent by the terminal, and the message 1 carries the dedicated preamble code and sends the message to the terminal.
  • Message 2 for responding to a random access request, the message 2 carrying the scheduling RNTI.
  • the base station receives the message 3 sent by the terminal, where the message 3 carries the scheduling RNTI; correspondingly, in step 31, after receiving the message 3, the base station establishes a context for the terminal according to the default configuration specified in the protocol RS36.331.
  • the PDCCH is scrambled by using the scheduling RNTI, and the uplink resource and/or the downlink resource are scheduled for the terminal, and the uplink data sent by the terminal is received on the scheduled uplink resource, and the downlink is sent to the terminal on the scheduled downlink resource. data.
  • the base station determines, according to the buffer status request (BSR) information carried in the message 3, that the terminal has uplink data to be sent, the PDCCH that is scrambled by using the scheduling RNTI is used to schedule uplink resources and downlink resources for the terminal according to the context. Otherwise, the downlink resource is scheduled for the terminal by using the PDCCH scrambled by the scheduling RNTI according to the context.
  • the BSR information is information for indicating the amount of data of the uplink data that the terminal needs to transmit.
  • the base station After receiving the uplink data sent by the terminal on the scheduled uplink resource, the base station sends an Acknowledgement (ACK) or a Negative Answer (NACK) message to the terminal according to the receiving situation. Specifically, if the uplink data is correctly received, the ACK information is sent, otherwise, the NACK information is sent.
  • ACK Acknowledgement
  • NACK Negative Answer
  • the base station if the base station only schedules downlink resources for the terminal, the base station carries the indication information for releasing the scheduling RNTI in the last downlink data sent to the terminal; and the base station receives the ACK for the last downlink data fed back by the terminal.
  • Information, releasing the scheduling RNTI and the context, otherwise, retransmitting the indication to the terminal The last downlink data of the information;
  • the base station after transmitting the last downlink data to the terminal and receiving the ACK information of the last downlink data fed back by the terminal, the base station sends the terminal to release the scheduling RNTI. Instructing information, if the base station receives the ACK information for the indication information that is fed back by the terminal, the base station releases the scheduling RNTI and the context, otherwise, the indication information is resent to the terminal.
  • the base station If the base station schedules the downlink resource and the uplink resource for the terminal, the base station correctly receives the uplink data sent by the terminal, and determines, according to the BSR information carried in the uplink data, that the uplink data is the last data sent by the terminal, and then sends the last data to the terminal.
  • the downlink data carries the indication information for releasing the scheduling RNTI; if the base station receives the ACK information of the last downlink data fed back by the terminal, the base station releases the scheduling RNTI and the context, otherwise, retransmits the bearer to the terminal.
  • the last downlink data of the indication information if the base station receives the ACK information of the last downlink data fed back by the terminal, the base station releases the scheduling RNTI and the context, otherwise, retransmits the bearer to the terminal.
  • the base station sends the last downlink data to the terminal and receives the ACK information of the last downlink data fed back by the terminal, and correctly receives the uplink data sent by the terminal and according to After the BSR information carried in the uplink data is determined to be the last data sent by the terminal, the terminal sends the indication information for releasing the scheduling RNTI to the terminal, and if the base station receives the ACK information of the indication information that is fed back by the terminal, Release the scheduling RNTI and the context, otherwise, retransmit the indication information to the terminal.
  • the base station If the base station only schedules the uplink resource for the terminal, the base station sends the uplink data sent by the terminal correctly, and determines, according to the BSR information carried in the uplink data, that the uplink data is the last data sent by the terminal, and then sends the release scheduling RNTI to the terminal. If the base station receives the ACK information for the indication information that is fed back by the terminal, the base station releases the scheduling RNTI and the context, otherwise, the indication information is resent to the terminal.
  • the base station may start a scheduling RNTI effective timer; After scheduling the RNTI and the context, the scheduling RNTI valid timer may be stopped. And when the scheduling RNTI valid timer expires, if the scheduling RNTI and the context have not been released, releasing the scheduling RNTI and the context.
  • the base station may further send the received uplink data and/or the transmission confirmation information of whether the downlink data is successfully sent to the core network device. Specifically, if the base station only schedules downlink resources for the terminal, the base station sends the transmission confirmation information of whether the downlink data is successfully sent to the core network device; if the base station schedules the downlink resource and the uplink resource for the terminal, the base station receives the uplink data and The transmission confirmation information of the downlink data is successfully sent to the core network device. If the base station only schedules the uplink resource, the base station sends the received uplink data to the core network device.
  • the base station may send a paging message to a cell; or, the base station sends a paging message to the cells in the tracking area TA according to the predetermined polling paging rule.
  • the base station may perform the data transmission characteristic information carried in the paging message sent by the core network device, After the current data transmission needs to use the data transmission mode that does not establish an RRC connection, the paging message is sent to the terminal. For example, if the paging message sent by the core network device carries the small data transmission characteristic information, the base station determines that the current data transmission needs to use the data transmission mode that does not establish an RRC connection.
  • the terminal may be a terminal that does not have a Radio Resource Control (RRC) connection with the network side, for example, the terminal is a terminal in an idle state.
  • RRC Radio Resource Control
  • the embodiment of the present invention provides a data transmission method, in which the terminal receives the scheduling RNTI sent by the base station, and listens to the PDCCH scrambled by using the scheduling RNTI, and uses the monitored PDCCH.
  • the scheduled resources send uplink data and/or receive downlink data.
  • a data transmission method provided by an embodiment of the present invention includes the following steps:
  • Step 40 The terminal receives the scheduling RNTI that is sent by the base station for scheduling resources, and the scheduling RNTI may be an existing RNTI such as a C-RNTI, or may be a newly defined RNTI;
  • Step 41 The terminal monitors the PDCCH that is scrambled by using the scheduled RNTI, and sends uplink data by using the uplink resource that is monitored by the monitored PDCCH, and/or receives the downlink data by using the downlink resource scheduled by the monitored PDCCH.
  • the terminal uses the downlink resource indicated by the downlink scheduling signaling to receive the downlink data sent by the base station to the terminal; if the monitored PDCCH carries the downlink scheduling signal, And the uplink scheduling signaling, the terminal uses the downlink resource indicated by the downlink scheduling signaling to receive the downlink data sent by the base station to the terminal, and sends the uplink data to the base station by using the uplink resource indicated by the uplink scheduling signaling;
  • the PDCCH carries only the uplink scheduling signaling, and the terminal sends the uplink data to the base station by using the uplink resource indicated by the uplink scheduling signaling.
  • the terminal receives the scheduling RNTI sent by the base station, where the terminal may receive the paging message sent by the base station, where the paging message carries the scheduling RNTI for scheduling resources.
  • the terminal listens to the PDCCH scrambled by using the scheduling RNTI, uses the uplink resource scheduled by the monitored PDCCH to send uplink data, and/or uses the monitored PDCCH.
  • the scheduled downlink resource receives downlink data.
  • the terminal receives the scheduling RNTI sent by the base station, where the terminal may receive the paging message sent by the base station, where the paging message carries the scheduling RNTI for scheduling resources. Then, the terminal sends a message 1 for requesting random access to the base station, where the message 1 carries a random access preamble code; the terminal receives a message 2 sent by the base station for responding to the random access request, where the message 2 carries the uplink TA And a cell RNTI; and transmitting a message 3 carrying the scheduling RNTI to the base station.
  • step 41 after transmitting the message 3, the terminal listens to the PDCCH scrambled by using the scheduling RNTI, uses the uplink resource scheduled by the monitored PDCCH to send uplink data, and/or uses the monitored PDCCH to schedule.
  • the downlink resource receives downlink data. If the terminal has uplink data to be sent, the message 3 also carries the BSR information whose value is not 0.
  • the BSR information is information for indicating the amount of data of the uplink data that the terminal needs to transmit.
  • the terminal receives the scheduling RNTI sent by the base station, where the terminal may: the terminal receives the paging message sent by the base station, where the paging message carries a dedicated preamble code, and the dedicated preamble code is performed by the terminal.
  • the preamble code used by the random access is different; the terminal sends a message 1 for requesting random access to the base station, where the message 1 carries the dedicated preamble code; and the terminal receives the message sent by the base station for responding to the random access request.
  • the message 2 carries the scheduling RNTL correspondingly.
  • step 41 after transmitting the message 2, the terminal listens to the PDCCH scrambled by using the scheduling RNTI, and uses the uplink resource scheduled by the monitored PDCCH to send uplink data, and / or, receiving downlink data by using the downlink resource scheduled by the monitored PDCCH.
  • the terminal receives the scheduling RNTI sent by the base station, where the terminal may: the terminal receives the paging message sent by the base station, where the paging message carries a dedicated preamble code, and the dedicated preamble code is performed by the terminal.
  • the preamble code used by the random access is different; the terminal sends a message 1 for requesting random access to the base station, where the message 1 carries the dedicated preamble code; and the terminal receives the message sent by the base station for responding to the random access request.
  • the message 2 carries the scheduling RNTI.
  • the terminal also sends a message 3 carrying the scheduled RNTI to the base station.
  • step 41 after transmitting the message 3, the terminal listens to the PDCCH scrambled by using the scheduling RNTI, and uses the uplink resource scheduled by the monitored PDCCH to send uplink data, and/or is scheduled by using the monitored PDCCH.
  • the downlink resources receive downlink data. If the terminal has uplink data to be sent, the message 3 also carries the BSR information whose value is not 0.
  • the terminal After receiving the downlink data by using the downlink resource scheduled by the monitored PDCCH, the terminal sends the ACK or NACK information to the base station according to the receiving situation. Specifically, if the downlink data is correctly received, the ACK information is sent, otherwise, the NACK information is sent.
  • the terminal correctly receives the indication information of the scheduling RNTI sent by the base station, the terminal feeds back the ACK information to the base station, releases the scheduling RNTI, and stops listening to the PDCCH. Otherwise, the terminal feeds back NACK information to the base station and continues to monitor the station.
  • the PDCCH; the indication information is carried in downlink data or other messages.
  • the terminal may start a scheduling RNTI valid timer; and after the terminal releases the scheduling RNTI, stop the scheduling. RNTI valid timer.
  • the scheduled RNTI valid timer expires, if the scheduled RNTI has not been released, the scheduled RNTI is released and the PDCCH is stopped.
  • the terminal is a terminal that does not have an RRC connection with the network side.
  • the e B After receiving the paging message of the core network, the e B sends a paging message to the MTC device (Device), and the paging message carries the scheduling RNTI or the dedicated preamble.
  • the eNB For the case where the paging carries the scheduling RNTI, for the case where the terminal is allowed to use the stored timing advance, the eNB The default configuration is used to establish a context for the terminal. For the case where the stored time advance is not allowed, the eNB establishes a context for the terminal after receiving the Msg3 carrying the scheduled RNTI allocated in the paging.
  • the eNB After receiving the dedicated preamble, the eNB carries the scheduling RNTI in the downlink Msg2, and establishes the context for the terminal by using the default configuration.
  • the eNB schedules the downlink resource for the MTC Device by scheduling the RNTI in a certain time range. If the BSR is received in the MSG3, the eNB schedules the uplink resource for the MTC Device by scheduling the RNTI.
  • the eNB may carry the release scheduling RNTI indication in the last small data that is sent if the downlink data is available. If the ACK is received by the uplink, the scheduling RNTI and the context of the terminal are released. If the scheduling RNTI valid timer is set, the timer is stopped. If the received NACK is received or no feedback is received, the last one is retransmitted. The packet data still contains the release scheduling RNTI indication.
  • the eNB may separately send the release scheduling RNTI indication, and if the uplink receives the ACK, release the scheduling RNTI and the context of the terminal. If the scheduling RNTI effective timer is set, the timer is stopped, if received, If the NACK is received or no feedback is received, the retransmission scheduling RNTI indication is retransmitted.
  • the eNB may carry the release schedule in the last small data delivered.
  • the RNTI indicates that if the uplink receives an ACK, the scheduling RNTI and the context of the terminal are released. If the received NACK or no feedback is received, the last packet data is retransmitted, and the release scheduling RNTI indication is still included.
  • the effective time can be set for the scheduling RNTI, and the effective time can be fixed, carried by the system broadcast or carried in the paging message. After the effective time of scheduling the RNTI arrives, the eNB releases the scheduled RNTI and releases the context of the terminal.
  • the MTC Device After receiving the paging of the scheduled RNTI, the MTC Device initiates random access by using the competitive preamble code for the case that the terminal is not allowed to use the stored time advance. After receiving the Msg2, the MTC Device sends the scheduled RNTI carried in the paging. Msg3, if there is uplink data waiting for transmission, Msg3 can contain information such as BSR. After the Msg3 is sent, the PDCCH is monitored during the effective time of scheduling the RNTI, and the scheduling information of the scheduled RNTI is monitored, and the downlink data is received by using the default configuration.
  • the terminal is allowed to use the stored timing advance
  • the PDCCH is monitored during the effective time of scheduling the RNTI, and the scheduling information of the scheduled RNTI is monitored, and the downlink data is received by using the default configuration, and the terminal is allowed to use the stored timing advance.
  • the terminal if the terminal needs to perform uplink synchronization, it can also send a competitive preamble, and obtain the timing advance through Msg2.
  • the MTC Device After receiving the paging with the dedicated preamble, the MTC Device initiates random access using the dedicated preamble, and obtains the synchronization and scheduling RNTI from the Msg2 fed back by the eNB. If the PDCCH is monitored during the effective time of scheduling the RNTI, and the scheduling information of the scheduled RNTI is monitored, the uplink and downlink data and the acknowledgement information are received and received using the default configuration.
  • the MTC Device receives the release scheduling RNTI indication, and if the ACK is fed back, the scheduling RNTI is released after the feedback.
  • the PDCCH is stopped to be monitored, and if the NACK is fed back, the PDCCH is continuously monitored.
  • Embodiment 1 After the effective time of scheduling the RNTI arrives, the MTC Device stops listening to the PDCCH and releases the scheduling RNTI.
  • This embodiment is a process for carrying a dedicated preamble in a paging message, as shown in FIG. 5A:
  • Step 1 When the network side (for example, the MTC server) needs to send a small amount of small data to the UE, send a small data transmission request carrying small data to the MME.
  • the network side for example, the MTC server
  • Step 2 The MME sends the small data and the identifier S-TMSI of the UE to the relevant base station by using a paging message, and the paging message may also carry the small data transmission characteristic information to notify the base station that the data transmission needs to be used.
  • Step 3 The base station saves related information and pages the terminal by using a paging message, where the paging message carries a dedicated preamble;
  • Step 4 The terminal initiates random access by using a dedicated preamble, that is, sending Msgl;
  • Step 5 The base station returns a random access response message (ie, Msg2) to the terminal, where the uplink TA and the scheduling RNTI are carried.
  • Msg2 a random access response message
  • Step 5a If the terminal has uplink small data waiting for transmission, send the Msg3, which includes the scheduling RNTI and the BSR, and the like;
  • Step 6 The base station establishes a context for the terminal by using the default configuration, and starts scheduling the RNTI effective timer.
  • Step 6a After receiving the Msg2 in step 5, the terminal starts scheduling the RNTI effective timer.
  • Step 7 The base station schedules downlink resources for the terminal by using the PDCCH that is scheduled to be RNTI scrambled.
  • Step 8 The base station sends downlink small data on the downlink resource, where the downlink small data may be, but not limited to, encapsulated in a NAS container. ;
  • Step 9 If there is uplink data transmission, the base station schedules the uplink resource for the terminal by using the PDCCH that is scrambled by scheduling the RNTI;
  • Step 10 If there is an uplink scheduling, the terminal uses the uplink resource scheduled in step 9 to transmit the uplink data, and simultaneously sends the acknowledgement information of the downlink data. If there is no uplink resource scheduled in step 9, the terminal uses the PUCCH to send the acknowledgement information of the downlink data.
  • Step 11 If there is uplink transmission, the base station uses the Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH) to send the acknowledgement information of the uplink data. If there is still downlink data transmission, the downlink data transmission may also be scheduled. The message carries the confirmation information of the uplink data;
  • PHICH Physical Hybrid Automatic Repeat Request Indicator Channel
  • the base station may carry the release scheduling RNTI indication in the last small data that is sent. If the uplink receives an ACK, the scheduling RNTI and the context of the terminal are released, and if the scheduling RNTI valid timer is set, the timer is stopped. If the received NACK or no feedback is received, the last packet of data is retransmitted, and the release scheduling RNTI indication is still included. If the base station does not have downlink data, it can send a release tone separately.
  • the RNTI indicates that if the uplink receives an ACK, the scheduling RNTI and the context of the terminal are released, and if the received NACK or no feedback is received, the retransmission scheduling RNTI indication is retransmitted.
  • the base station may carry the release scheduling RNTI indication in the last small data that is sent, and release the scheduling RNTI and the context of the terminal if the uplink receives the ACK, if the scheduling RNTI effective timer is set. , then stop the timer. If the received NACK is received or no feedback is received, the last packet of data is retransmitted, and the release scheduling RNTI indication is still included;
  • steps 7 to 11 may be repeated according to the data transmission condition
  • Step 12 The base station sends the transmission confirmation information of the uplink small data/downlink small data to the MME;
  • the base station may not acknowledge the downlink small data successfully, and only feedback the failure confirmation.
  • the failure determination is that after the scheduled RNTI effective time arrives, the terminal does not receive the confirmation information of the downlink small data.
  • Step 13 The MME forwards the received transmission confirmation information of the uplink small data/downlink small data to the MTC server.
  • Step 14 The base station side schedules the RNTI effective timer to time out, releases the scheduling RNTI and the terminal context.
  • Step 14a Terminal side scheduling The RNTI valid timer expires, releasing the scheduling RNTI, and stopping monitoring the PDCCH. Note 1: If there is no uplink data waiting for transmission, step 5a may not be available.
  • the small data here is based on the small data generated by the MTC server, but the other core network nodes do not exclude the small data transmission. The process is similar.
  • Step 10 uses the uplink resource scheduled by step 9 to transmit uplink data and carries the acknowledgement information of the downlink data. If there is no step 5a, then without step 9, the terminal uses the PUCCH to send the downlink. Confirmation information of the data.
  • the scheduling RNTI can be, but is not limited to, C-RNTI.
  • the above flowchart is for the case of paging in a certain cell. Since the paging range initiated by the MME may be the TA zone, it may be, but is not limited to, performing the cell search in the TA range according to the predetermined polling paging rule. After the paging of a certain cell, if the Msg 1 carrying the dedicated preamble is received, the subsequent operation starting from step 5 is performed, and the paging is stopped. If Msg 1 carrying a dedicated preamble is not received within a fixed time range, paging is initiated for the next cell, or paging is resent in the current cell.
  • the terminal in this embodiment may be a terminal that does not have an RRC connection with the network side.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • This embodiment is a process for carrying a scheduling RNTI in a paging message, as shown in FIG. 5B:
  • Step 3 The base station saves related information and pages the terminal by paging message, which carries the scheduling RNTI;
  • Step 4 The terminal initiates random access by using the contentive random access preamble, that is, sends the Msgl;
  • Step 5 The base station returns a random access response message (ie, Msg2) to the terminal, where the uplink TA and the allocated cell RNTI are carried; Step 5a: After receiving the Msg2, the terminal sends the scheduling RNTI to the base station in the Msg3. If there is uplink data to be transmitted, the Msg3 can carry the BSR.
  • Msg2 a random access response message
  • Step 6 After receiving the Msg3 carrying the scheduled RNTI, the base station uses the scheduling RNTI to schedule the terminal according to the RNTI carried in step 5 corresponding to the uplink resource used by the receiving Msg3.
  • the terminal can store the time advance in the last transmission process, and can initiate uplink synchronization without using random access. If the situation is allowed, the terminal and the base station can directly perform the subsequent operations starting from step 6. The terminal determines whether to perform step 3 to step 5a according to the situation, or the two parties can agree on a fixed time, and the base station schedules the terminal from the appointed time.
  • the above flowchart is for the case of paging in a certain cell. Since the paging range initiated by the MME may be the TA zone, it may be, but is not limited to, performing the cell search in the TA range according to the predetermined polling paging rule. call.
  • step 10 After paging a certain cell, if the terminal does not allow the terminal to use the stored timing advance, if the Msg3 carrying the scheduled RNTI is received within a certain time, the subsequent operation starting from step 6 is performed, and the paging is stopped; Otherwise, a page is initiated for the next cell, or a page is retransmitted in the current cell. If the terminal is allowed to use the stored time advance amount, if the uplink data of the terminal or the acknowledgement information of the downlink data is received within a certain time (step 10), the subsequent operation started in step 10 is performed, and the paging is stopped; otherwise, , initiate paging to the next cell, or resend the paging in the current cell.
  • Downstream data can be carried in the paging message.
  • the terminal in this embodiment may be a terminal that does not have an RRC connection with the network side.
  • the following information elements for indicating scheduling RNTI and downlink data are added to the Paging message:
  • a new Msg3 message carrying the scheduling RNTI may be defined, for example:
  • ScheduleRequest SEQUENCE ⁇ criticalExtensions CHOICE ⁇
  • ScheduleRequest-rx ScheduleRequest-rx-IEs.
  • ScheduleRequest-rx-IEs :: SEQUENCE ⁇
  • OPTIONAL - Need OP is based on the same inventive concept, and a base station is also provided in the embodiment of the present invention. Since the principle of solving the problem is similar to the data transmission method shown in FIG. 3, the implementation of the base station can refer to the implementation of the method. , the repetition will not be repeated.
  • an embodiment of the present invention provides a base station, where the base station includes:
  • the information processing unit 60 is configured to send the scheduling radio network temporary identifier RNTI for scheduling resources to the terminal, and the data transmission unit 61 is configured to establish a context for the terminal, and use the scheduling RNTI to scramble according to the context.
  • the physical downlink control channel PDCCH is used to schedule the uplink resource and/or the downlink resource for the terminal, and receive the uplink data sent by the terminal on the scheduled uplink resource, and send the downlink data to the terminal on the scheduled downlink resource.
  • the information processing unit 60 is configured to:
  • the information processing unit 60 is further configured to:
  • the information processing unit 60 is configured to:
  • the paging message carrying the dedicated preamble code is sent to the terminal, and the dedicated preamble code is different from the preamble code used for random access of the terminal;
  • the message 1 carries the dedicated preamble code, and sends a message 2 for responding to the random access request to the terminal, where the message 2 carries the scheduling RNTI.
  • the information processing unit 60 is further configured to:
  • the message 3 sent by the terminal is received, and the message 3 carries the scheduled RNTI.
  • the data transmission unit 61 is used to:
  • the uplink resource and the downlink resource are scheduled for the terminal by using the PDCCH scrambled by using the scheduling RNTI according to the context; otherwise, according to the context
  • the downlink resource is scheduled for the terminal by using the PDCCH scrambled by the scheduling RNTI.
  • the data transmission unit 61 is further configured to:
  • the terminal After receiving the uplink data sent by the terminal on the scheduled uplink resource, the terminal sends an acknowledgement ACK or a negative acknowledgement NACK message to the terminal according to the received situation.
  • the data transmission unit 61 is further configured to:
  • the last downlink data sent to the terminal carries the indication information for releasing the scheduling RNTI; if the ACK information of the last downlink data fed back by the terminal is received, the Scheduling the RNTI and the context, otherwise, retransmitting the last downlink data carrying the indication information to the terminal; or
  • the mode is as follows:
  • RNTI indication information Mode A: After correctly receiving the uplink data sent by the terminal and determining, according to the BSR information carried in the uplink data, the uplink data is the last data sent by the terminal, and carrying the uplink data in the last downlink data sent to the terminal.
  • a downlink data mode B after correctly receiving the uplink data sent by the terminal and determining, according to the BSR information carried in the uplink data, the uplink data is the last data sent by the terminal, and after transmitting the last downlink data to the terminal, Sending, by the terminal, indication information that releases the scheduling RNTI; or
  • the uplink resource is only scheduled by the terminal, the uplink data sent by the terminal is correctly received and according to the uplink data.
  • the carried BSR information determines that the uplink data is the last data sent by the terminal, and sends the indication information for releasing the scheduling RNTI to the terminal. If the ACK information of the indication information fed back by the terminal is received, the scheduling RNTI is released. And the context, otherwise, the indication information is resent to the terminal.
  • the data transmission unit 61 is further configured to:
  • the scheduling RNTI valid timer is started after the context is established for the terminal, and the uplink resource and/or the downlink resource is scheduled for the terminal by using the PDCCH scrambled by the scheduling RNTI according to the context;
  • the scheduling RNTI valid timer is stopped.
  • the data transmission unit 61 is further configured to:
  • the scheduling RNTI valid timer is started after the context is established for the terminal, and the uplink resource and/or the downlink resource is scheduled for the terminal by using the PDCCH scrambled by the scheduling RNTI according to the context;
  • the data transmission unit 61 is further configured to:
  • the information processing unit 60 is configured to:
  • the paging message is respectively sent to the cells in the tracking area TA range.
  • the information processing unit 60 is configured to:
  • the core network device According to the data transmission characteristic information carried in the paging message sent by the core network device, it is determined that the current data transmission needs to use the data transmission mode that does not establish an RRC connection, and then the paging message is sent to the terminal.
  • the terminal is a terminal that does not have an RRC connection with the network side.
  • a terminal is provided in the embodiment of the present invention.
  • the principle of solving the problem is similar to the data transmission method shown in FIG. 4, so the implementation of the terminal can refer to the implementation of the method, and the repetition is not Let me repeat.
  • an embodiment of the present invention provides a terminal, where the terminal includes:
  • the processing unit 70 is configured to receive a scheduling radio network temporary identifier RNTI that is sent by the eNodeB for scheduling resources, and a transmitting unit 71, configured to monitor a physical downlink control channel PDCCH that is scrambled by using the scheduling RNTI, and use the monitored PDCCH.
  • the scheduled uplink resource sends uplink data, and/or receives downlink data by using the downlink resource scheduled by the monitored PDCCH.
  • the processing unit 70 is configured to:
  • the processing unit 70 is further configured to:
  • the processing unit 70 is configured to:
  • the base station Receiving a paging message sent by the base station, where the paging message carries a dedicated preamble code, and the dedicated preamble code is different from a preamble code used by the terminal for random access;
  • the processing unit 70 is further configured to:
  • the message 3 carrying the scheduled RNTI is transmitted to the base station.
  • the processing unit 70 is further configured to:
  • the message 3 that carries the buffer status request BSR information whose value is not 0 is sent to the base station.
  • the transmission unit 71 is further configured to:
  • the acknowledgement ACK or the negative acknowledgement NACK information is sent to the base station according to the reception situation.
  • the transmission unit 70 is further configured to:
  • the ACK information is fed back to the base station, and the scheduling RNTI is released and the PDCCH is stopped to be monitored. Otherwise, the NACK information is fed back to the base station and the PDCCH is continuously monitored.
  • the indication information is carried in downlink data or other messages.
  • the transmission unit 70 is further configured to:
  • the scheduling RNTI valid timer is stopped.
  • the transmission unit 70 is further configured to:
  • the scheduled RNTI valid timer expires, if the scheduled RNTI has not been released, the scheduled RNTI is released and the PDCCH is stopped.
  • the terminal is a terminal that does not have an RRC connection with the network side.
  • the beneficial effects of the present invention include:
  • the base station sends the scheduling RNTI to the terminal, and uses the scheduling RNTI as The terminal schedules the uplink resource and/or the downlink resource, and receives the uplink data sent by the terminal on the scheduled uplink resource, and sends the downlink data to the terminal on the scheduled downlink resource. It can be seen that, in this method, the base station can also perform uplink and downlink data transmission without establishing an RRC connection. Since the establishment of the RRC connection requires a large signaling overhead, the solution can effectively reduce the signaling overhead of the system.
  • the terminal receives the scheduling RNTI sent by the base station, and listens to use the scheduling.
  • the PDCCH scrambled by the RN is used to transmit uplink data and/or receive downlink data using the resources scheduled by the monitored PDCCH. It can be seen that, in this method, the terminal can also perform uplink/downlink data transmission without establishing an RRC connection, and a large signaling overhead is required for establishing an RRC connection. Therefore, the solution can effectively reduce the signaling overhead of the system.
  • the present invention provides a method for transmitting data without establishing an RRC connection.
  • a message such as a dedicated preamble or scheduling RNTI
  • the e B uses the scheduling RNTI to be found without establishing an RRC connection.
  • the calling terminal schedules uplink/downlink resources to perform data transmission, and realizes reliable data transmission without establishing an RRC connection, which saves signaling interaction process, reduces signaling overhead, and saves time.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Abstract

本申请实施例公开了一种数据传输方法和设备,涉及无线通信技术领域,用于降低系统的信令开销。本申请中,基站将调度无线网络临时标识RNTI,下发给终端;基站通过使用所述调度RNTI加扰的物理下行控制信道PDCCH为终端调度上行资源和/或下行资源,并在调度的上行资源上接收终端发送的上行数据,在调度的下行资源上向终端发送下行数据。终端监听使用所述调度RNTI加扰的PDCCH,使用监听到的PDCCH所调度的资源发送上行数据和/或接收下行数据。采用本申请的方法,能够有效降低系统的信令开销。

Description

数据传输方法和设备 本申请要求在 2011年 8月 19日提交中国专利局、 申请号为 201110240607.3、 发明名 称为"数据传输方法和设备 "的中国专利申请的优先权, 其全部内容通过引用结合在本申请 中。
技术领域
本发明涉及无线通信领域, 尤其涉及一种数据传输方法和设备。
背景技术
长期演进(Long Term Evolution, LTE )系统网络架构如图 1所示, 其中包括接入点名 ( Access Point Name, APN )节点、 分组数据网关( Packet Data Network GW, P-GW 服 务网关 ( Serving Gateway, S-GW 移动管理实体( Mobile Management Entity, MME )、 基站(eNB )和用户终端 (User Equipment, UE )。
为了便于新业务的开展, LTE系统釆用了用户面与控制面分离的设计方式, 控制面信 令与用户面承载分别由独立的网元(即 MME和 S-GW )来负责。 MME主要功能是建立非 接入层(Non Access Stratum, NAS )信令、 保证 NAS信令安全、 建立跨核心网的信令、 跟踪服务、 漫游服务、 授权和承载管理等。 S-GW为 eNB切换时的关口点、 转发 2G / 3G 以及其他系统业务数据的关口点, 并完成下行数据包的緩冲、 一些初始化工作、 规定的拦 截侦听、 数据包路由和转发等。 P-GW用于策略的执行、 包过滤、 规定的拦截、 UE的因特 网协议(Internet Protocol, IP )地址的分配、 计费功能、 数据包再现等。
UE、 eNB与核心网之间的控制信令通过 MME进行处理; 用户数据通过 S-GW传输到 P-GW, 然后由 P-GW传输到外部的各类 APN节点。 由于减少了控制信令与用户数据的耦 合, 当新业务出现只需对负责用户面承载的网元进行升级, 而不会对控制信息传输造成影 响, 从而极大地降低了网络维护的复杂度和设备升级成本。
LTE系统中处于空闲 (idle )状态的 UE, 如果有数据需要向网络侧发送时, 需要在数 据发送前进行连接 /承载的建立, 具体信令流程如图 2所示:
步骤 1 : 当 UE有数据需要发送时, 首先根据系统配置的随机接入资源信息, 等待随 机接入信道 ( Random Access Channel, RACH )调度周期, 选择一个前导 (preamble )码, 并向 eNB发送携带该 preamble码的随机接入请求, 即发送消息 ( Message, Msg ) 1。
步骤 2: eNB在接收到 UE发送的 Msgl后, 在随机接入响应窗中向 UE发送随机接入 响应消息,即发送 Msg2。一条随机接入响应消息可以对多个 UE的随机接入请求进行响应。 Msg2由随机接入无线网络临时标识(Random Access-RNTI, RA-RNTI )加扰的下行控制 信息( Downlink Control Information, DCI )进行调度, RA-RNTI由发送 Msgl的时频资源 位置确定。 Msg2中的内容包括: 回退(backoff )参数、 与 Msgl对应的 preamble码标识、 上行传输定时提前量( Timing Advance, TA )、 为 Msg3分配的上行资源( Msg3调度信息)、 临时的小区无线网络临时标识( Cell-Radio Network Temporary Identifier, C-RNTI )。 backoff 参数用于指示如果本次随机接入失败, UE 下次发起随机接入的时延均值。 UE 通过 RA-RNTI和 Msg2中的 preamble码标识确定发送给自己的随机接入响应, 如果 Msg2中的 preamble码标识对应的 preamble码中包含有自己发起的随机接入请求中的 preamble码,那 么认为自己成功接收到随机接入响应消息,后续将向网络侧发送 Msg3。如果 UE没有正确 接收到 Msg2 , 则依据 backoff参数的时延限制确定发起下一次随机接入的时延, 另外选择 随机接入资源发起下一次随机接入。 达到最大随机接入次数后, UE 的媒体接入控制 ( Medium Access Control, MAC )层向无线资源控制 (Radio Resource Control, RRC )层 上 ·ί艮随机接入问题, 触发无线链路失败过程。
步骤 3: UE在接收到 Msg2后, 在 Msg2分配的上行资源上发送 Msg3。 针对不同的场 景, Msg3中包含不同的内容。 例如, 在初始接入时, Msg3中携带 RRC层生成的 RRC连 接重建请求消息。
步骤 4: e B和 UE通过 Msg4完成最终的竟争解决。 Msg4中的内容与 Msg3中的内 容是相对应的。初始接入时, Msg4中携带 UE竟争解决标识,即 MAC层控制单元( Contention Resolution Identity MAC CE ),这个 MAC CE中包含 UE在 Msg3中传输的公共控制信道服 务数据单元(Common Control Channel Service Data Unit, CCCH SDU ), UE在接收到该 MAC CE后, 与自身 RRC层信息比较, 以完成竟争解决。 另外, Msg4中可以包含 RRC 连接建立消息, 用于建立 UE的信令无线承载( Signaling Radio Bearer, SRB ) 1。
步骤 5: UE在竟争解决完成后,根据 RRC连接建立消息中的信息建立 SRB1 , 并向网 络侧发送 RRC连接建立完成消息。 NAS业务请求( service request ) 消息可以在发送 RRC 连接建立完成消息时向网络侧捎带发送。
步骤 6: eNB在接收到 RRC连接建立完成消息后, 将捎带的 NAS业务请求消息发送 给 MME , 用于请求 MME建立 UE对应的 eNB与核心网网元间的相关连接, 包括与 MME 的控制面连接和与 S-GW的无线接入 载(Evolved Packet System Radio Access Bearer, E-RAB )。
步骤 7: MME将 UE对应连接的信息通知给 e B。
步骤 8: eNB向 UE发送安全模式命令 ( Security Mode Command, SMC )和 RRC连 接重配消息。用于激活 UE的安全性和为 UE建立数据无线承载( Data Radio Bearer, DRB ) 和其他信令无线承载即 SBR2。需要指出的是 SMC和 RRC连接重配可以在一条 RRC消息 中发送, 也可以分别发送。
步骤 9: 在安全性激活和 DRB、 SRB2配置完成后, UE向网络侧发送安全模式完成消 息和 RRC连接重配完成消息。 步骤 10: 在经过上述过程后, UE的用户面数据由 DRB、 SI承载, 通过 e B、 S-GW 发送给核心网; UE与核心网的控制信令通过 SRB和 eNB与 MME之间的控制面连接发送 给 MME。
对于去附着 (detach )状态的 UE, 当 UE需要向网络侧发送数据时, UE需要先发起 附着(attach )过程, 附着到网络, 另外, 为确定用户的合法性还需要通过鉴权过程进行确 认。 信令流程相对于图 2中所示的过程将更为复杂, 这里不进行详细描述。
机器类型通信(Machine-type communication, MTC )作为一种新型的通信理念, 其目 的是将多种不同类型的通信技术有机结合, 如: 机器对机器通信、 机器控制通信、 人机交 互通信、 移动互联通信, 从而推动社会生产和生活方式的发展。 预计未来人对人通信的业 务可能仅占整个终端市场的 1/3 , 而更大数量的通信是 MTC通信业务。 有时, MTC又称 为机器间 ( Machine-to-machine, M2M )通信或物联网。
当前的移动通信网络是针对人与人之间的通信设计的, 如: 网络容量的确定等。 如果 希望利用移动通信网络来支持 MTC就需要根据 MTC的特点对移动通信系统的机制进行优 化,以便能够在对传统的人与人之间的通信不受或受较小影响的情况下,更好地实现 MTC。
当前认识到的 MTC可能存在的一些特点有: MTC终端具有低移动性; MTC终端与 网络侧进行数据传输的时间是可控的; MTC终端与网络侧进行的数据传输对实时性要求不 高, 即具有时间容忍性; MTC终端能量受限, 要求极低的功率消耗; MTC终端和网络侧 之间只进行小数据量的信息传输; MTC终端可以以组为单位进行管理; 等等。 一个实际的 MTC终端可以具有上述的一个或多个特点。
在实现本发明的过程中, 发明人发现现有技术中存在以下技术问题:
尽管在 MTC 中, MTC 终端的数量将大大超出传统通信终端的数量, 但是, 在许多 MTC 的应用场景中, 存在一些单向下行小数据传输、 单向上行小数据传输、 交互的上 /下 行小数据传输的应用场景, 每次传输的数据量并不是很大(通常为几十到几百字节), 一 个或几个子帧便可传输完成。 然而, 网络侧和 MTC终端为了发送这些数据, 按照当前的 数据发送方式也需要通过如图 2所示的信令流程建立 DRB/RB、 Sl/Iu承载后, 才能通过 DRB/RB, Sl/Iu承载传输数据, 而如图 2所示的信令流程需要较大的信令开销, 从而降低 了系统效率。
发明内容
本发明实施例提供一种数据传输方法和设备, 用于降低系统的信令开销。
一种数据传输方法, 该方法包括:
基站将用于调度资源的调度无线网络临时标识 RNTI, 下发给终端;
基站为终端建立上下文, 根据该上下文通过使用所述调度 RNTI加扰的物理下行控制 信道 PDCCH, 为终端调度上行资源和 /或下行资源, 并在调度的上行资源上接收终端发送 的上行数据 , 在调度的下行资源上向终端发送下行数据。
一种数据传输方法, 该方法包括:
终端接收基站下发的用于调度资源的调度无线网络临时标识 RNTI;
终端监听使用所述调度 RNTI 加扰的物理下行控制信道 PDCCH, 使用监听到的 PDCCH所调度的上行资源发送上行数据, 和 /或, 使用监听到的 PDCCH所调度的下行资 源接收下行数据。
一种基站, 该基站包括:
信息处理单元, 用于将用于调度资源的调度无线网络临时标识 RNTI, 下发给终端; 数据传输单元, 用于基站为终端建立上下文, 根据该上下文通过使用所述调度 RNTI 加扰的物理下行控制信道 PDCCH, 为终端调度上行资源和 /或下行资源, 并在调度的上行 资源上接收终端发送的上行数据 , 在调度的下行资源上向终端发送下行数据。
一种终端, 该终端包括:
处理单元, 用于接收基站下发的用于调度资源的调度无线网络临时标识 RNTI;
传输单元,用于监听使用所述调度 RNTI加扰的物理下行控制信道 PDCCH,使用监听 到的 PDCCH所调度的上行资源发送上行数据 , 和 /或, 使用监听到的 PDCCH所调度的下 行资源接收下行数据。
本发明实施例提供的方案中, 基站将调度 RNTI下发给终端, 使用所述调度 RNTI为 终端调度上行资源和 /或下行资源, 并在调度的上行资源上接收终端发送的上行数据, 在调 度的下行资源上向终端发送下行数据。 可见, 釆用本方法, 在不建立 RRC 连接的情况下 基站也可进行上 /下行数据传输, 由于建立 RRC连接需要较大的信令开销, 因此, 本方案 能够有效降低系统的信令开销。
本发明实施例提供的方案中, 终端接收基站下发的调度 RNTI, 并监听使用所述调度 RNTI加扰的 PDCCH,使用监听到的 PDCCH所调度的资源发送上行数据和 /或接收下行数 据。 可见, 釆用本方法, 在不建立 RRC连接的情况下终端也可进行上 /下行数据传输, 由 于建立 RRC连接需要较大的信令开销, 因此, 本方案能够有效降低系统的信令开销。 附图说明
图 1为现有技术中的 LTE系统网络架构示意图;
图 2为现有技术中的 LTE系统连接 /承载建立过程示意图;
图 3为本发明实施例提供的方法流程示意图;
图 4为本发明实施例提供的另一方法示意图;
图 5A为本发明实施例一的流程示意图;
图 5B为本发明实施例二的流程示意图;
图 6为本发明实施例提供的设备结构示意图; 图 7为本发明实施例提供的另一设备结构示意图。
具体实施方式
为了降低系统的信令开销, 本发明实施例提供一种数据传输方法, 该方法中, 基站将 调度无线网络临时标识(RNTI )下发给终端, 使用所述调度 RNTI为终端调度上行资源和 /或下行资源, 并在调度的上行资源上接收终端发送的上行数据, 在调度的下行资源上向终 端发送下行数据。
参见图 3 , 本发明实施例提供的数据传输方法, 包括以下步骤:
步骤 30: 基站将用于调度资源的调度 RNTI下发给终端; 调度 RNTI可以是 C-RNTI 等已有的 RNTI, 也可以是新定义的 RNTI;
步骤 31 : 基站为终端建立上下文, 根据该上下文通过使用所述调度 RNTI加扰的物理 下行控制信道(PDCCH ), 为终端调度上行资源和 /或下行资源, 并在调度的上行资源上接 收终端发送的上行数据, 在调度的下行资源上向终端发送下行数据。 具体的, 若基站仅为 终端调度下行资源, 则基站使用调度的下行资源向终端发送下行数据; 若基站为终端调度 下行资源和上行资源, 则基站使用调度的下行资源向终端发送下行数据 , 及接收终端使用 调度的上行资源发送的上行数据; 若基站仅为终端调度上行资源, 则基站接收终端使用调 度的上行资源发送的上行数据。
作为一种实现方式, 步骤 30中基站将调度 RNTI下发给终端, 具体可以是在接收到核 心网设备的寻呼消息后,向终端下发携带所述调度 RNTI的寻呼消息。相应的,步骤 31中, 基站在向终端下发寻呼消息后, 根据协议 RS36.331中规定的默认配置为终端建立上下文, 并根据该上下文通过使用所述调度 RNTI加扰的 PDCCH, 为终端调度上行资源和 /或下行 资源, 并在调度的上行资源上接收终端发送的上行数据, 在调度的下行资源上向终端发送 下行数据。
作为另一种实现方式, 步骤 30中基站将调度 RNTI下发给终端, 具体可以是在接收到 核心网设备的寻呼消息后, 向终端下发携带所述调度 RNTI的寻呼消息。 然后, 基站接收 终端发送的用于请求随机接入的消息 1 , 该消息 1中携带随机接入 preamble码; 基站向终 端发送用于响应随机接入请求的消息 2,该消息 2中携带上行 TA和小区 RNTI ( C-RNTI ); 基站接收终端发送的携带所述调度 RNTI的消息 3。 那么, 步骤 31中, 基站在接收到消息 3后, 释放所述消息 2中携带的小区 RNTI, 根据协议 RS36.331中规定的默认配置为终端 建立上下文,根据该上下文通过使用所述调度 RNTI加扰的 PDCCH, 为终端调度上行资源 和 /或下行资源, 并在调度的上行资源上接收终端发送的上行数据, 在调度的下行资源上向 终端发送下行数据。 这里, 终端根据上行 TA与基站侧保持上行同步后, 向基站发送上行 数据。
具体的, 若基站根据所述消息 3中携带的緩存状态请求(Buffer Status Report, BSR ) 信息确定终端有上行数据需要发送, 则根据该上下文通过使用所述调度 RNTI 加扰的 PDCCH 为终端调度上行资源和下行资源; 否则, 根据该上下文通过使用所述调度 RNTI 加扰的 PDCCH为终端调度下行资源。 BSR信息是用于表示终端需要发送的上行数据的数 据量的信息。
作为又一种实现方式, 步骤 30中基站将调度 RNTI下发给终端, 具体可以是基站在接 收到核心网设备的寻呼消息后, 向终端下发携带专用 preamble 码的寻呼消息, 该专用 preamble码与用于终端随机接入的 preamble码(即随机接入 preamble )不同; 基站接收终 端发送的用于请求随机接入的消息 1 , 该消息 1中携带所述专用 preamble码, 向终端发送 用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTI。 相应的, 步骤 31中, 基站在接收到消息 2后,根据协议 RS36.331中规定的默认配置为终端建立上下文,根据该 上下文通过使用所述调度 RNTI加扰的 PDCCH, 为终端调度上行资源和 /或下行资源, 并 在调度的上行资源上接收终端发送的上行数据, 在调度的下行资源上向终端发送下行数 据。
作为再一种实现方式, 步骤 30中基站将调度 RNTI下发给终端, 具体可以是基站在接 收到核心网设备的寻呼消息后, 向终端下发携带专用 preamble 码的寻呼消息, 该专用 preamble码与用于终端随机接入的 preamble码(即随机接入 preamble )不同; 基站接收终 端发送的用于请求随机接入的消息 1 , 该消息 1中携带所述专用 preamble码, 向终端发送 用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTI。 然后, 基站接收到终端 发送的消息 3 , 该消息 3中携带所述调度 RNTI; 相应的, 步骤 31中, 基站在接收到消息 3后, 根据协议 RS36.331中规定的默认配置为终端建立上下文, 根据该上下文通过使用所 述调度 RNTI加扰的 PDCCH, 为终端调度上行资源和 /或下行资源, 并在调度的上行资源 上接收终端发送的上行数据 , 在调度的下行资源上向终端发送下行数据。
具体的, 若基站根据所述消息 3中携带的緩存状态请求(BSR )信息确定终端有上行 数据需要发送, 则根据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度上行 资源和下行资源; 否则, 根据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调 度下行资源。 BSR信息是用于表示终端需要发送的上行数据的数据量的信息。
对于上述四种实现方式:
进一步的, 基站在调度的上行资源上接收终端发送的上行数据后, 根据接收情况向终 端发送肯定应答(Acknowledgement, ACK )或否定应答( Not- acknowledgement , NACK ) 信息。 具体的, 若正确接收上行数据, 则发送 ACK信息, 否则, 发送 NACK信息。
进一步的, 若基站仅为终端调度下行资源, 则基站在发送给终端的最后一个下行数据 中携带释放所述调度 RNTI的指示信息; 基站若接收到终端反馈的对所述最后一个下行数 据的 ACK信息, 则释放所述调度 RNTI以及所述上下文, 否则, 向终端重发携带所述指示 信息的最后一个下行数据;
当然, 这里也可以釆用其他实现方式, 例如, 基站在向终端发送了最后一个下行数据 并且接收到终端反馈的对所述最后一个下行数据的 ACK信息后, 向终端发送释放所述调 度 RNTI的指示信息,基站若接收到终端反馈的对所述指示信息的 ACK信息,则释放所述 调度 RNTI以及所述上下文, 否则, 向终端重发所述指示信息。
若基站为终端调度下行资源和上行资源, 则基站在正确接收终端发送的上行数据并且 根据该上行数据中携带的 BSR信息确定该上行数据为终端发送的最后一个数据后,在发送 给终端的最后一个下行数据中携带释放所述调度 RNTI的指示信息; 基站若接收到终端反 馈的对所述最后一个下行数据的 ACK信息,则释放所述调度 RNTI以及所述上下文,否则, 向终端重发携带所述指示信息的最后一个下行数据;
当然, 这里也可以釆用其他实现方式, 例如, 基站在向终端发送了最后一个下行数据 并且接收到终端反馈的对所述最后一个下行数据的 ACK信息、 以及正确接收终端发送的 上行数据并且根据该上行数据中携带的 BSR信息确定该上行数据为终端发送的最后一个 数据后, 向终端发送释放所述调度 RNTI的指示信息, 基站若接收到终端反馈的对所述指 示信息的 ACK信息, 则释放所述调度 RNTI以及所述上下文, 否则, 向终端重发所述指示 信息。
若基站仅为终端调度上行资源, 则基站在正确接收终端发送的上行数据并且根据该上 行数据中携带的 BSR信息确定该上行数据为终端发送的最后一个数据后,向终端发送释放 所述调度 RNTI的指示信息;基站若接收到终端反馈的对所述指示信息的 ACK信息,则释 放所述调度 RNTI以及所述上下文, 否则, 向终端重发所述指示信息。
进一步的,在基站为终端建立上下文之后、并且根据该上下文通过使用所述调度 RNTI 加扰的 PDCCH为终端调度上行资源和 /或下行资源之前, 基站可以启动调度 RNTI有效定 时器; 在基站释放所述调度 RNTI以及所述上下文之后, 可以停止所述调度 RNTI有效定 时器。 在所述调度 RNTI有效定时器超时时, 若还未释放所述调度 RNTI以及所述上下文, 则释放所述调度 RNTI以及所述上下文。
进一步的,基站还可以将接收到的上行数据和 /或是否成功发送下行数据的传输确认信 息发送给核心网设备。 具体的, 若基站仅为终端调度下行资源, 则基站将是否成功发送下 行数据的传输确认信息发送给核心网设备; 若基站为终端调度下行资源和上行资源, 则基 站将接收到的上行数据和是否成功发送下行数据的传输确认信息发送给核心网设备; 若基 站仅为终端调度上行资源, 则基站将接收到的上行数据发送给核心网设备。
进一步的, 步骤 30 中基站可以针对一个小区下发寻呼消息; 或者, 基站按照预定的 轮流寻呼规则, 针对跟踪区 TA范围内的小区分别下发寻呼消息。
进一步的, 基站可以根据核心网设备发送的寻呼消息中携带的数据传输特性信息, 确 定本次数据传输需要釆用不建立 RRC连接的数据传输方式后, 向终端下发所述寻呼消息。 例如, 核心网设备发送的寻呼消息中携带小数据传输特性信息, 则基站确定本次数据传输 需要釆用不建立 RRC连接的数据传输方式。
进一步的, 所述终端可以是与网络侧不存在无线资源控制(RRC )连接的终端, 例如, 该终端为处于空闲状态的终端。
为了降低系统的信令开销, 本发明实施例提供一种数据传输方法, 该方法中, 终端接 收基站下发的调度 RNTI,并监听使用所述调度 RNTI加扰的 PDCCH,使用监听到的 PDCCH 所调度的资源发送上行数据和 /或接收下行数据。
参见图 4, 本发明实施例提供的数据传输方法, 包括以下步骤:
步骤 40: 终端接收基站下发的用于调度资源的调度 RNTI; 调度 RNTI可以是 C-RNTI 等已有的 RNTI, 也可以是新定义的 RNTI;
步骤 41 : 终端监听使用所述调度 RNTI加扰的 PDCCH, 使用监听到的 PDCCH所调 度的上行资源发送上行数据, 和 /或, 使用监听到的 PDCCH所调度的下行资源接收下行数 据。 具体的, 若监听到的 PDCCH中仅携带有下行调度信令, 则终端使用该下行调度信令 指示的下行资源接收基站向该终端发送的下行数据; 若监听到的 PDCCH中携带有下行调 度信令和上行调度信令, 则终端使用该下行调度信令指示的下行资源接收基站向该终端发 送的下行数据, 以及使用该上行调度信令指示的上行资源向基站发送上行数据; 若监听到 的 PDCCH中仅携带有上行调度信令, 则终端使用该上行调度信令指示的上行资源向基站 发送上行数据。
作为一种实现方式, 步骤 40中终端接收基站下发的调度 RNTI, 具体可以是终端接收 基站下发的寻呼消息,该寻呼消息中携带用于调度资源的调度 RNTI。相应的, 步骤 41中, 终端在接收到寻呼消息后,监听使用所述调度 RNTI加扰的 PDCCH,使用监听到的 PDCCH 所调度的上行资源发送上行数据, 和 /或, 使用监听到的 PDCCH所调度的下行资源接收下 行数据。
作为另一种实现方式, 步骤 40中终端接收基站下发的调度 RNTI, 具体可以是终端接 收基站下发的寻呼消息, 该寻呼消息中携带用于调度资源的调度 RNTI。 然后, 终端向基 站发送用于请求随机接入的消息 1 , 该消息 1中携带随机接入 preamble码; 终端接收基站 发送的用于响应随机接入请求的消息 2, 该消息 2中携带上行 TA和小区 RNTI; 并向基站 发送携带所述调度 RNTI的消息 3。 那么, 步骤 41中, 终端在发送消息 3后, 监听使用所 述调度 RNTI加扰的 PDCCH, 使用监听到的 PDCCH所调度的上行资源发送上行数据 , 和 /或,使用监听到的 PDCCH所调度的下行资源接收下行数据。若终端有上行数据需要发送, 则所述消息 3中还携带取值不为 0的 BSR信息。 BSR信息是用于表示终端需要发送的上 行数据的数据量的信息。 作为又一种实现方式, 步骤 40中终端接收基站下发的调度 RNTI, 具体可以是: 终端 接收基站下发的寻呼消息,该寻呼消息中携带专用 preamble码,该专用 preamble码与终端 进行随机接入所使用的 preamble码不同; 终端向基站发送用于请求随机接入的消息 1 , 该 消息 1中携带所述专用 preamble码;终端接收基站发送的用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTL 相应的, 步骤 41中, 终端在发送消息 2后, 监听使用所 述调度 RNTI加扰的 PDCCH, 使用监听到的 PDCCH所调度的上行资源发送上行数据, 和 /或, 使用监听到的 PDCCH所调度的下行资源接收下行数据。
作为再一种实现方式, 步骤 40中终端接收基站下发的调度 RNTI, 具体可以是: 终端 接收基站下发的寻呼消息,该寻呼消息中携带专用 preamble码,该专用 preamble码与终端 进行随机接入所使用的 preamble码不同; 终端向基站发送用于请求随机接入的消息 1 , 该 消息 1中携带所述专用 preamble码;终端接收基站发送的用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTI。 然后, 终端还向基站发送携带所述调度 RNTI的消息 3。 相应的, 步骤 41中, 终端在发送消息 3后, 监听使用所述调度 RNTI加扰的 PDCCH, 使 用监听到的 PDCCH所调度的上行资源发送上行数据 , 和 /或, 使用监听到的 PDCCH所调 度的下行资源接收下行数据。 若终端有上行数据需要发送, 则所述消息 3中还携带取值不 为 0的 BSR信息。
在上述四种实现方式中:
进一步的, 终端在使用监听到的 PDCCH所调度的下行资源接收下行数据后, 根据接 收情况向基站发送 ACK或 NACK信息。 具体的, 若正确接收下行数据, 则发送 ACK信 息, 否则, 发送 NACK信息。
进一步的, 终端若正确接收基站发送的释放所述调度 RNTI的指示信息, 则向基站反 馈 ACK信息,并释放所述调度 RNTI以及停止监听所述 PDCCH,否则,向基站反馈 NACK 信息并继续监听所述 PDCCH; 所述指示信息携带在下行数据或其他消息中。
进一步的, 在终端接收所述调度 RNTI之后、 并且终端监听使用所述调度 RNTI加扰 的 PDCCH之前, 终端可以启动调度 RNTI有效定时器; 以及, 在终端释放所述调度 RNTI 之后, 停止所述调度 RNTI有效定时器。 在所述调度 RNTI有效定时器超时时, 若还未释 放所述调度 RNTI, 则释放所述调度 RNTI并停止监听所述 PDCCH。
进一步的, 所述终端是与网络侧不存在 RRC连接的终端。
下面结合具体实施例对本发明进行说明:
基站( e B )侧行为:
e B接收到核心网的寻呼消息后, 向 MTC设备(Device )发送寻呼 (paging ) 消息, 同时寻呼消息中携带调度 RNTI或专用 preamble。
对于寻呼中携带调度 RNTI的情况,对于允许终端使用存储的时间提前量的情况, eNB 使用默认配置为该终端建立上下文, 对于不允许使用存储的时间提前量的情况, eNB在收 到携带寻呼中分配的调度 RNTI的 Msg3后为该终端建立上下文。
对于寻呼中携带专用 preamble的情况, eNB收到专用 preamble后, 在下行 Msg2中携 带调度 RNTI, 并使用默认配置为该终端建立上下文。
eNB为该终端建立上下文后, 一定时间范围内通过调度 RNTI为 MTC Device调度下 行资源,如果在 MSG3中收到 BSR,则 eNB通过调度 RNTI为 MTC Device调度上行资源。
对于有上行数据传输的情况, 当 eNB接收到的上行 BSR为 0,且对上行数据进行了确 认的情况下, eNB如果有下行数据, 可以在下发的最后一个小数据中携带释放调度 RNTI 指示, 如果上行接收到的是 ACK, 则释放调度 RNTI及该终端的上下文, 如果设置了调度 RNTI有效定时器, 则停止该定时器, 如果接收到的是 NACK或没有收到反馈, 则重发最 后一包数据, 仍包含释放调度 RNTI指示。 eNB如果没有下行数据, 可以单独发送释放调 度 RNTI指示, 如果上行接收到的是 ACK, 则释放调度 RNTI及该终端的上下文, 如果设 置了调度 RNTI有效定时器, 则停止该定时器, 如果接收到的是 NACK或没有收到反馈, 则重发释放调度 RNTI指示。
对于没有上行数据传输的情况, eNB 可以在下发的最后一个小数据中携带释放调度
RNTI指示, 如果上行接收到的是 ACK, 则释放调度 RNTI及该终端的上下文, 如果接收 到的是 NACK或没有收到反馈, 则重发最后一包数据, 仍包含释放调度 RNTI指示。
可以为调度 RNTI设置有效时间, 有效时间可以固定, 通过系统广播携带或者寻呼消 息中携带。 调度 RNTI的有效时间到达后, eNB释放该调度 RNTI, 同时释放该终端的上 下文。
终端侧行为:
MTC Device收到携带调度 RNTI的寻呼后,对于不允许终端使用存储的时间提前量的 情况,使用竟争 preamble码发起随机接入,在收到 Msg2后,使用寻呼中携带的调度 RNTI 发送 Msg3 , 如果有上行数据等待传输, Msg3中可以包含 BSR等信息。 发送 Msg3后, 在 调度 RNTI的有效时间内监听 PDCCH, 监听到对该调度 RNTI的调度信息, 则使用默认配 置接收下行数据。 对于允许终端使用存储的时间提前量的情况, 在调度 RNTI的有效时间 内监听 PDCCH, 监听到对该调度 RNTI的调度信息, 则使用默认配置接收下行数据, 对于 允许终端使用存储的时间提前量的情况, 如果终端需要进行上行同步, 也可以发送竟争的 preamble , 通过 Msg2获得时间提前量。
MTC Device收到携带专用 preamble的寻呼后, 使用专用 preamble发起随机接入, 从 eNB反馈的 Msg2中获得同步及调度 RNTI。如果在调度 RNTI的有效时间内监听 PDCCH, 监听到对该调度 RNTI的调度信息, 则使用默认配置接收发送上下行数据以及确认信息。
MTC Device接收到释放调度 RNTI指示, 如果反馈 ACK, 则反馈后释放调度 RNTI, 停止监听 PDCCH, 如果反馈 NACK, 则继续监听 PDCCH。
调度 RNTI的有效时间到达后, MTC Device停止监听 PDCCH, 并释放调度 RNTI。 实施例一:
本实施例为寻呼消息中携带专用 preamble的流程, 如图 5A所示:
步骤 1: 网络侧(例如 MTC服务器)有数量较少的小数据需要下发给 UE时, 向 MME 发送携带小数据的小数据传输请求;
步骤 2: MME将小数据以及该 UE的标识 S-TMSI, 通过寻呼消息发送给相关的基站, 寻呼消息中还可以携带小数据传输特性信息, 以通知基站本次数据传输需要釆用不建立 RRC连接的数据传输方式;
步骤 3 : 基站保存相关的信息并通过寻呼消息寻呼该终端, 寻呼消息中携带专用 preamble;
步骤 4: 终端使用专用 preamble发起随机接入, 即发送 Msgl;
步骤 5:基站向终端返回随机接入响应消息(即 Msg2 ),其中携带上行 TA和调度 RNTI; 步骤 5a:如果终端有上行小数据等待传输,则发送 Msg3 ,其中包含调度 RNTI和 BSR 等;
步骤 6: 基站使用默认配置为该终端建立上下文, 并启动调度 RNTI有效定时器; 步骤 6a: 终端收到步骤 5的 Msg2后启动调度 RNTI有效定时器;
步骤 7: 基站通过使用调度 RNTI加扰的 PDCCH, 为该终端调度下行资源; 步骤 8: 基站在下行资源上发送下行小数据, 下行小数据可以是但不限于封装在 NAS 容器 ( container ) 中的;
步骤 9: 如果有上行数据传输,则基站通过使用调度 RNTI加扰的 PDCCH为该终端调 度上行资源;
步骤 10: 如果有上行调度, 终端使用步骤 9调度的上行资源传输上行数据, 并同时发 送下行数据的确认信息, 如果没有步骤 9调度的上行资源, 则终端使用 PUCCH发送下行 数据的确认信息;
步骤 11 :如果有上行传输,基站使用物理混合自动重传请求指示信道( Physical Hybrid Automatic Repeat Request Indicator Channel, PHICH )发送上行数据的确认信息, 如果仍有 下行数据传输, 也可以通过调度下行数据传输的消息携带上行数据的确认信息;
对于有上行数据传输的情况, 当基站接收到的上行 BSR为 0, 且对上行数据进行了确 认的情况下, 基站如果有下行数据, 可以在下发的最后一个小数据中携带释放调度 RNTI 指示, 如果上行接收到的是 ACK, 则释放调度 RNTI及该终端的上下文, 如果设置了调度 RNTI有效定时器, 则停止该定时器。 如果接收到的是 NACK或没有收到反馈, 则重发最 后一包数据, 仍包含释放调度 RNTI指示。 基站如果没有下行数据, 可以单独发送释放调 度 RNTI指示, 如果上行接收到的是 ACK, 则释放调度 RNTI及该终端的上下文, 如果接 收到的是 NACK或没有收到反馈, 则重发释放调度 RNTI指示。 对于没有上行数据传输的 情况, 基站可以在下发的最后一个小数据中携带释放调度 RNTI指示, 如果上行接收到的 是 ACK, 则释放调度 RNTI及该终端的上下文, 如果设置了调度 RNTI有效定时器, 则停 止该定时器。 如果接收到的是 NACK或没有收到反馈, 则重发最后一包数据, 仍包含释放 调度 RNTI指示;
在调度 RNTI有效时间内, 可以根据数据传输情况重复步骤 7到步骤 11;
步骤 12: 基站将上行小数据 /下行小数据的传输确认信息发给 MME;
基站可以不反馈下行小数据成功确认, 只反馈失败确认, 失败判定为在调度 RNTI有 效时间到达后, 仍未收到终端对下行小数据的确认信息;
步骤 13: MME将收到的上行小数据 /下行小数据的传输确认信息转发给 MTC server; 步骤 14: 基站侧调度 RNTI有效定时器超时, 释放调度 RNTI和该终端上下文; 步骤 14a: 终端侧调度 RNTI有效定时器超时, 释放调度 RNTI, 停止监听 PDCCH。 注 1 : 如果没有上行数据等待传输, 步骤 5a可以没有。
注 2: 这里的小数据是以 MTC server产生的小数据为例, 但不排除其他核心网节点有 小数据发送的情况, 流程是类似的。
注 3: 如果有步骤 5a, 则存在上面步骤 9, 步骤 10使用步骤 9调度的上行资源传输上 行数据, 并携带下行数据的确认信息, 没有步骤 5a, 则没有步骤 9, 则终端使用 PUCCH 发送下行数据的确认信息。
注 4: 调度 RNTI可以是但不限于 C-RNTI。
注 5: 以上流程图是针对某个小区进行寻呼的情况, 由于 MME发起的寻呼范围可能 是 TA区, 可以但不限于按照预定的轮流寻呼规则, 对 TA范围内的小区分别进行寻呼, 在对某个小区寻呼后, 若接收到携带专用 preamble的 Msg 1 , 则执行步骤 5开始的后续操 作, 并停止寻呼。 若固定时间范围内没有收到携带专用 preamble的 Msg 1 , 则对下一个小 区发起寻呼, 或者在当前小区重发寻呼。
注 6: 本实施例中的终端可以是与网络侧不存在 RRC连接的终端。
实施例二:
本实施例为寻呼消息中携带调度 RNTI的流程, 如图 5B所示:
除步骤 3到步骤 6外, 其余步骤与实施例一相同, 这里不再赘述。
步骤 3: 基站保存相关的信息并通过寻呼消息寻呼该终端, 其中携带调度 RNTI; 步骤 4: 终端使用竟争的随机接入 preamble发起随机接入, 即发送 Msgl;
步骤 5: 基站向终端返回随机接入响应消息 (即 Msg2 ), 其中携带上行 TA和分配的 小区 RNTI; 步骤 5a: 终端收到 Msg2后, 在 Msg3中将调度 RNTI发送给基站, 如果有上行数据 要传, 则 Msg3中可以携带 B SR;
步骤 6: 基站收到携带调度 RNTI的 Msg3后, 根据接收 Msg3使用的上行资源对应释 放步骤 5中携带的 RNTI, 使用调度 RNTI为终端进行调度。
除寻呼中携带专用 preamble的注 1到注 4外, 需要增加以下 3条:
注 5: 终端可以存储上次传输过程中的时间提前量, 可以不发起随机接入, 使用存储 的时间提前量进行上行同步。 如果允许这种情况, 则终端和基站可以直接执行步骤 6开始 的后续操作,终端根据情况判断是否进行步骤 3到步骤 5a,也可以双方约定一个固定时间, 基站从约定时间开始调度该终端。
注 6: 以上流程图是针对某个小区进行寻呼的情况, 由于 MME发起的寻呼范围可能 是 TA区, 可以但不限于按照预定的轮流寻呼规则, 对 TA范围内的小区分别进行寻呼。
在对某个小区寻呼后, 对于不允许终端使用存储的时间提前量的情况, 若在一定的时 间内收到携带调度 RNTI的 Msg3 , 则执行步骤 6开始的后续操作, 并停止寻呼; 否则, 对 下一个小区发起寻呼, 或者在当前小区重发寻呼。 对于允许终端使用存储的时间提前量的 情况, 若在一定的时间内收到终端的上行数据或下行数据的确认信息 (步骤 10 ), 则执行 步骤 10 开始的后续操作, 并停止寻呼; 否则, 对下一个小区发起寻呼, 或者在当前小区 重发寻呼。
注 7: 寻呼消息中可以携带下行数据。
注 8: 本实施例中的终端可以是与网络侧不存在 RRC连接的终端。
对于 LTE系统, 对 Paging消息的几种可能的爹改方式如下:
方式一
在 Paging消息中增加以下用于表示调度 RNTI的信息单元:
temp-Schedule-RNTI-vxyO C-RNTI OPTIONAL -- Need OP
方式二
在 Paging消息中增加以下用于表示专用 preamble的信息单元:
rach-ConfigDedicated-vxyO RACH-ConfigDedicated OPTIONAL -- Need OP 方式三
在 Paging消息中增加以下用于表示调度 RNTI和下行数据的信息单元:
temp-Schedule-RNTI-vxyO C-RNTI OPTIONAL, -- Need OP dedicatedlnfoNAS-vxyO DedicatedlnfoNAS OPTIONAL 对于 LTE系统, 可能定义新的携带调度 RNTI的 Msg3消息, 例如:
ScheduleRequest ::= SEQUENCE { criticalExtensions CHOICE {
ScheduleRequest-rx ScheduleRequest-rx-IEs.
criticalExtensionsFuture SEQUENCE {}
ScheduleRequest-rx-IEs ::= SEQUENCE {
temp-Schedule-RNTI C-RNTI,
buffer- Status-Report BIT STRING (SIZE (6)) OPTIONAL. }
对于 LTE系统, 对下行信息传输( DLInformationTransfer ) 消息的几种可能的修改方 式如下:
方式一:
在 DLInformationTransfer消息中增加用于释放调度 RNTI的信元: releaselnd;
方式二:
在 DLInformationTransfer消息中增加如下用于释放调度 RNTI的信元:
DLInformationTransfer- vxyO-IEs ::= SEQUENCE {
releaselnd ENUMERATED {true} OPTIONAL, nonCriticalExtension SEQUENCE {}
OPTIONAL -- Need OP 基于同一发明构思, 本发明实施例中还提供了一种基站, 由于该基站解决问题的原理 与图 3所示的数据传输方法相似, 因此该基站的实施可以参见方法的实施, 重复之处不再 赘述。
参见图 6, 本发明实施例提供一种基站, 该基站包括:
信息处理单元 60, 用于将用于调度资源的调度无线网络临时标识 RNTI, 下发给终端; 数据传输单元 61 ,用于基站为终端建立上下文,根据该上下文通过使用所述调度 RNTI 加扰的物理下行控制信道 PDCCH, 为终端调度上行资源和 /或下行资源, 并在调度的上行 资源上接收终端发送的上行数据 , 在调度的下行资源上向终端发送下行数据。
所述信息处理单元 60用于:
在接收到核心网设备的寻呼消息后, 向终端下发携带所述调度 RNTI的寻呼消息。 所述信息处理单元 60还用于:
在向终端下发寻呼消息之后、 并且为终端建立上下文之前, 接收终端发送的用于请求 随机接入的消息 1 , 该消息 1中携带随机接入前导 preamble码;
向终端发送用于响应随机接入请求的消息 2, 该消息 2中携带上行定时提前量 TA和 小区 RNTI;
接收终端发送的携带所述调度 RNTI的消息 3 ,并释放所述消息 2中携带的小区 RNTI。 所述信息处理单元 60用于:
在接收到核心网设备的寻呼消息后,向终端下发携带专用前导 preamble码的寻呼消息, 该专用 preamble码与用于终端随机接入的 preamble码不同;
接收终端发送的用于请求随机接入的消息 1 , 该消息 1中携带所述专用 preamble码, 向终端发送用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTI。
所述信息处理单元 60还用于:
在向终端发送消息 2之后、 并且为终端建立上下文之前, 接收终端发送的消息 3 , 该 消息 3中携带所述调度 RNTI。
所述数据传输单元 61用于:
若根据所述消息 3中携带的緩存状态请求 BSR信息确定终端有上行数据需要发送,则 根据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度上行资源和下行资源; 否则, 根据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度下行资源。
所述数据传输单元 61还用于:
在调度的上行资源上接收终端发送的上行数据后, 根据接收情况向终端发送肯定应答 ACK或否定应答 NACK信息。
所述数据传输单元 61还用于:
若仅为终端调度下行资源, 则在发送给终端的最后一个下行数据中携带释放所述调度 RNTI的指示信息; 若接收到终端反馈的对所述最后一个下行数据的 ACK信息, 则释放所 述调度 RNTI以及所述上下文, 否则, 向终端重发携带所述指示信息的最后一个下行数据; 或者,
若为终端调度下行资源和上行资源, 则釆用如下方式 A或方式 B下发释放所述调度
RNTI 的指示信息: 方式 A: 在正确接收终端发送的上行数据并且根据该上行数据中携带 的 BSR信息确定该上行数据为终端发送的最后一个数据后,在发送给终端的最后一个下行 数据中携带释放所述调度 RNTI的指示信息; 若接收到终端反馈的对所述最后一个下行数 据的 ACK信息, 则释放所述调度 RNTI以及所述上下文, 否则, 向终端重发携带所述指示 信息的最后一个下行数据方式 B :在正确接收终端发送的上行数据并且根据该上行数据中 携带的 BSR信息确定该上行数据为终端发送的最后一个数据、以及向终端发送最后一个下 行数据后, 通过信令向终端发送释放所述调度 RNTI的指示信息; 或者,
若仅为终端调度上行资源, 则在正确接收终端发送的上行数据并且根据该上行数据中 携带的 BSR信息确定该上行数据为终端发送的最后一个数据后,向终端发送释放所述调度 RNTI 的指示信息; 若接收到终端反馈的对所述指示信息的 ACK信息, 则释放所述调度 RNTI以及所述上下文, 否则, 向终端重发所述指示信息。
所述数据传输单元 61还用于:
在为终端建立上下文之后、并且根据该上下文通过使用所述调度 RNTI加扰的 PDCCH 为终端调度上行资源和 /或下行资源之前, 启动调度 RNTI有效定时器; 以及,
在释放所述调度 RNTI以及所述上下文之后 , 停止所述调度 RNTI有效定时器。
所述数据传输单元 61还用于:
在为终端建立上下文之后、并且根据该上下文通过使用所述调度 RNTI加扰的 PDCCH 为终端调度上行资源和 /或下行资源之前, 启动调度 RNTI有效定时器; 以及,
在所述调度 RNTI有效定时器超时时, 若还未释放所述调度 RNTI以及所述上下文, 则释放所述调度 RNTI以及所述上下文。
所述数据传输单元 61还用于:
将接收到的上行数据和 /或是否成功发送下行数据的传输确认信息发送给核心网设备。 所述信息处理单元 60用于:
针对一个小区下发寻呼消息; 或者,
按照预定的轮流寻呼规则, 针对跟踪区 TA范围内的小区分别下发寻呼消息。
所述信息处理单元 60用于:
根据核心网设备发送的寻呼消息中携带的数据传输特性信息, 确定本次数据传输需要 釆用不建立 RRC连接的数据传输方式后, 向终端下发所述寻呼消息。
所述终端是与网络侧不存在 RRC连接的终端。
基于同一发明构思, 本发明实施例中还提供了一种终端, 由于该终端解决问题的原理 与图 4所示的数据传输方法相似, 因此该终端的实施可以参见方法的实施, 重复之处不再 赘述。
参见图 7, 本发明实施例提供一种终端, 该终端包括:
处理单元 70, 用于接收基站下发的用于调度资源的调度无线网络临时标识 RNTI; 传输单元 71 , 用于监听使用所述调度 RNTI加扰的物理下行控制信道 PDCCH, 使用 监听到的 PDCCH所调度的上行资源发送上行数据 , 和 /或, 使用监听到的 PDCCH所调度 的下行资源接收下行数据。
所述处理单元 70用于:
接收基站下发的寻呼消息, 该寻呼消息中携带用于调度资源的调度 RNTI。
所述处理单元 70还用于:
在接收基站下发的寻呼消息之后、并且监听使用所述调度 RNTI加扰的 PDCCH之前, 向基站发送用于请求随机接入的消息 1 , 该消息 1中携带随机接入前导 preamble码; 接收基站发送的用于响应随机接入请求的消息 2 ,该消息 2中携带上行定时提前量 TA 和小区 RNTI; 并向基站发送携带所述调度 RNTI的消息 3。
所述处理单元 70用于:
接收基站下发的寻呼消息, 该寻呼消息中携带专用前导 preamble码, 该专用 preamble 码与终端进行随机接入所使用的 preamble码不同;
向基站发送用于请求随机接入的消息 1 , 该消息 1中携带所述专用 preamble码; 接收基站发送的用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTI。 所述处理单元 70还用于:
在接收基站发送的消息 2之后、 并且监听使用所述调度 RNTI加扰的 PDCCH之前, 向基站发送携带所述调度 RNTI的消息 3。
所述处理单元 70还用于:
在终端有上行数据需要发送时,向基站发送携带取值不为 0的緩存状态请求 BSR信息 的消息 3。
所述传输单元 71还用于:
在使用监听到的 PDCCH所调度的下行资源接收下行数据后, 根据接收情况向基站发 送肯定应答 ACK或否定应答 NACK信息。
所述传输单元 70还用于:
若正确接收基站发送的释放所述调度 RNTI的指示信息,则向基站反馈 ACK信息,并 释放所述调度 RNTI以及停止监听所述 PDCCH, 否则, 向基站反馈 NACK信息并继续监 听所述 PDCCH; 所述指示信息携带在下行数据或其他消息中。
所述传输单元 70还用于:
在接收所述调度 RNTI之后、 并且监听使用所述调度 RNTI加扰的 PDCCH之前, 启 动调度 RNTI有效定时器; 以及,
在释放所述调度 RNTI之后, 停止所述调度 RNTI有效定时器。
所述传输单元 70还用于:
在接收所述调度 RNTI之后、 并且监听使用所述调度 RNTI加扰的 PDCCH之前, 启 动调度 RNTI有效定时器; 以及,
在所述调度 RNTI有效定时器超时时, 若还未释放所述调度 RNTI, 则释放所述调度 RNTI并停止监听所述 PDCCH。
所述终端是与网络侧不存在 RRC连接的终端。
综上, 本发明的有益效果包括:
本发明实施例提供的方案中, 基站将调度 RNTI下发给终端, 使用所述调度 RNTI为 终端调度上行资源和 /或下行资源, 并在调度的上行资源上接收终端发送的上行数据, 在调 度的下行资源上向终端发送下行数据。 可见, 釆用本方法, 在不建立 RRC 连接的情况下 基站也可进行上下行数据传输, 由于建立 RRC 连接需要较大的信令开销, 因此, 本方案 能够有效降低系统的信令开销。
本发明实施例提供的方案中, 终端接收基站下发的调度 RNTI, 并监听使用所述调度
RNTI加扰的 PDCCH,使用监听到的 PDCCH所调度的资源发送上行数据和 /或接收下行数 据。 可见, 釆用本方法, 在不建立 RRC连接的情况下终端也可进行上 /下行数据传输, 由 于建立 RRC连接需要较大的信令开销, 因此, 本方案能够有效降低系统的信令开销。
本发明给出一种不建立 RRC 连接的情况下传输数据的方法, 通过寻呼中携带专用 preamble或调度 RNTI等信息的方式, 在不建立 RRC连接的情况下, e B使用调度 RNTI 为被寻呼终端调度上 /下行资源, 进行数据传输, 实现不建立 RRC连接的情况下数据的可 靠传输, 节省了信令交互过程, 降低了信令开销, 也节约了时间。
本发明是参照根据本发明实施例的方法、 设备(系统)、 和计算机程序产品的流程图 和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图和 /或方框图中的每一流 程和 /或方框、 以及流程图和 /或方框图中的流程和 /或方框的结合。 可提供这些计算机 程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器 以产生一个机器, 使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用 于实现在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方 式工作的计算机可读存储器中, 使得存储在该计算机可读存储器中的指令产生包括指令装 置的制造品, 该指令装置实现在流程图一个流程或多个流程和 /或方框图一个方框或多个 方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上, 使得在计算机 或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理, 从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和 /或方框图一个 方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例, 但本领域内的技术人员一旦得知了基本创造性概 念, 则可对这些实施例作出另外的变更和修改。 所以, 所附权利要求意欲解释为包括优选 实施例以及落入本发明范围的所有变更和修改。
显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种数据传输方法, 其特征在于, 该方法包括:
基站将用于调度资源的调度无线网络临时标识 RNTI, 下发给终端;
基站为终端建立上下文, 根据该上下文通过使用所述调度 RNTI加扰的物理下行控制 信道 PDCCH, 为终端调度上行资源和 /或下行资源, 并在调度的上行资源上接收终端发送 的上行数据 , 在调度的下行资源上向终端发送下行数据。
2、 如权利要求 1 所述的方法, 其特征在于, 所述基站将用于调度资源的调度 RNTI 下发给终端包括:
基站在接收到核心网设备的寻呼消息后,向终端下发携带所述调度 RNTI的寻呼消息。 3、 如权利要求 2 所述的方法, 其特征在于, 在基站向终端下发寻呼消息之后、 并且 基站为终端建立上下文之前, 进一步包括:
基站接收终端发送的用于请求随机接入的消息 1 , 该消息 1 中携带随机接入前导 preamble码;
基站向终端发送用于响应随机接入请求的消息 2,该消息 2中携带上行定时提前量 TA 和小区 RNTI;
基站接收终端发送的携带所述调度 RNTI的消息 3 , 并释放所述消息 2中携带的小区 RNTL
4、 如权利要求 1 所述的方法, 其特征在于, 所述基站将用于调度资源的调度 RNTI 下发给终端包括:
基站在接收到核心网设备的寻呼消息后, 向终端下发携带专用前导 preamble码的寻呼 消息, 该专用 preamble码与用于终端随机接入的 preamble码不同;
基站接收终端发送的用于请求随机接入的消息 1 , 该消息 1 中携带所述专用 preamble 码, 向终端发送用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTI。
5、 如权利要求 4所述的方法, 其特征在于, 在基站向终端发送消息 2之后、 并且为 终端建立上下文之前, 进一步包括:
基站接收终端发送的消息 3 , 该消息 3中携带所述调度 RNTI。
6、 如权利要求 3或 5所述的方法, 其特征在于, 所述根据该上下文通过使用所述调 度 RNTI加扰的 PDCCH为终端调度上行资源和 /或下行资源包括:
若基站根据所述消息 3 中携带的緩存状态请求 BSR信息确定终端有上行数据需要发 送, 则根据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度上行资源和下行 资源; 否则, 根据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度下行资源。
7、 如权利要求 1-5中任一所述的方法, 其特征在于, 进一步包括:
基站在调度的上行资源上接收终端发送的上行数据后, 根据接收情况向终端发送肯定 应答 ACK或否定应答 NACK信息。
8、 如权利要求 1-5中任一所述的方法, 其特征在于, 进一步包括:
若基站仅为终端调度下行资源, 则基站在发送给终端的最后一个下行数据中携带释放 所述调度 RNTI的指示信息;基站若接收到终端反馈的对所述最后一个下行数据的 ACK信 息, 则释放所述调度 RNTI以及所述上下文, 否则, 向终端重发携带所述指示信息的最后 一个下行数据;
或者,
若基站为终端调度下行资源和上行资源,则基站釆用如下方式 A或方式 B下发释放所 述调度 RNTI的指示信息: 方式 A: 基站在正确接收终端发送的上行数据并且根据该上行 数据中携带的 BSR信息确定该上行数据为终端发送的最后一个数据后,在发送给终端的最 后一个下行数据中携带释放所述调度 RNTI的指示信息; 基站若接收到终端反馈的对所述 最后一个下行数据的 ACK信息, 则释放所述调度 RNTI以及所述上下文, 否则, 向终端重 发携带所述指示信息的最后一个下行数据; 方式 B: 基站在正确接收终端发送的上行数据 并且根据该上行数据中携带的 BSR信息确定该上行数据为终端发送的最后一个数据、以及 向终端发送最后一个下行数据后, 通过信令向终端发送释放所述调度 RNTI的指示信息; 或者,
若基站仅为终端调度上行资源, 则基站在正确接收终端发送的上行数据并且根据该上 行数据中携带的 BSR信息确定该上行数据为终端发送的最后一个数据后,向终端发送释放 所述调度 RNTI的指示信息;基站若接收到终端反馈的对所述指示信息的 ACK信息,则释 放所述调度 RNTI以及所述上下文, 否则, 向终端重发所述指示信息。
9、 如权利要求 8 所述的方法, 其特征在于, 在基站为终端建立上下文之后、 并且根 据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度上行资源和 /或下行资源之 前, 进一步包括: 基站启动调度 RNTI有效定时器; 以及,
在基站释放所述调度 RNTI以及所述上下文之后, 进一步包括: 停止所述调度 RNTI 有效定时器。
10、 如权利要求 8所述的方法, 其特征在于, 在基站为终端建立上下文之后、 并且根 据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度上行资源和 /或下行资源之 前, 进一步包括: 基站启动调度 RNTI有效定时器; 以及,
基站在所述调度 RNTI有效定时器超时时, 若还未释放所述调度 RNTI以及所述上下 文, 则释放所述调度 RNTI以及所述上下文。
11、 如权利要求 1-5中任一所述的方法, 其特征在于, 进一步包括:
基站将接收到的上行数据和 /或是否成功发送下行数据的传输确认信息发送给核心网 设备。 12、 如权利要求 1-5中任一所述的方法, 其特征在于, 所述基站向终端下发寻呼消息 包括:
基站针对一个小区下发寻呼消息; 或者,
基站按照预定的轮流寻呼规则, 针对跟踪区 TA范围内的小区分别下发寻呼消息。 13、 如权利要求 2或 4所述的方法, 其特征在于, 基站根据核心网设备发送的寻呼消 息中携带的数据传输特性信息, 确定本次数据传输需要釆用不建立无线资源控制 RRC 连 接的数据传输方式后, 向终端下发所述寻呼消息。
14、如权利要求 1-5中任一所述的方法,其特征在于,所述终端是与网络侧不存在 RRC 连接的终端。
15、 一种数据传输方法, 其特征在于, 该方法包括:
终端接收基站下发的用于调度资源的调度无线网络临时标识 RNTI;
终端监听使用所述调度 RNTI 加扰的物理下行控制信道 PDCCH, 使用监听到的 PDCCH所调度的上行资源发送上行数据, 和 /或, 使用监听到的 PDCCH所调度的下行资 源接收下行数据。
16、 如权利要求 15 所述的方法, 其特征在于, 所述终端接收基站下发的用于调度资 源的调度 RNTI包括:
终端接收基站下发的寻呼消息, 该寻呼消息中携带用于调度资源的调度 RNTI。
17、 如权利要求 16所述的方法, 其特征在于, 在终端接收基站下发的寻呼消息之后、 并且终端监听使用所述调度 RNTI加扰的 PDCCH之前, 进一步包括:
终端向基站发送用于请求随机接入的消息 1 , 该消息 1 中携带随机接入前导 preamble 码;
终端接收基站发送的用于响应随机接入请求的消息 2 , 该消息 2中携带上行定时提前 量 TA和小区 RNTI; 并向基站发送携带所述调度 RNTI的消息 3。
18、 如权利要求 15 所述的方法, 其特征在于, 所述终端接收基站下发的用于调度资 源的调度 RNTI包括:
终端接收基站下发的寻呼消息, 该寻呼消息中携带专用前导 preamble 码, 该专用 preamble码与终端进行随机接入所使用的 preamble码不同;
终端向基站发送用于请求随机接入的消息 1 , 该消息 1中携带所述专用 preamble码; 终端接收基站发送的用于响应随机接入请求的消息 2,该消息 2中携带所述调度 RNTI。 19、 如权利要求 18所述的方法, 其特征在于, 在终端接收基站发送的消息 2之后、 并且监听使用所述调度 RNTI加扰的 PDCCH之前, 进一步包括:
终端向基站发送携带所述调度 RNTI的消息 3。
20、 如权利要求 17或 19所述的方法, 其特征在于, 若终端有上行数据需要发送, 则 所述消息 3中还携带取值不为 0的緩存状态请求 BSR信息。
21、 如权利要求 15-19中任一所述的方法, 其特征在于, 进一步包括:
终端在使用监听到的 PDCCH所调度的下行资源接收下行数据后, 根据接收情况向基 站发送肯定应答 ACK或否定应答 NACK信息。
22、 如权利要求 15-19中任一所述的方法, 其特征在于, 进一步包括:
终端若正确接收基站发送的释放所述调度 RNTI的指示信息,则向基站反馈 ACK信息, 并释放所述调度 RNTI以及停止监听所述 PDCCH, 否则, 向基站反馈 NACK信息并继续 监听所述 PDCCH; 所述指示信息携带在下行数据或其他消息中。
23、 如权利要求 22所述的方法, 其特征在于, 在终端接收所述调度 RNTI之后、 并且 终端监听使用所述调度 RNTI加扰的 PDCCH之前, 进一步包括: 终端启动调度 RNTI有 效定时器; 以及,
在终端释放所述调度 RNTI之后 , 进一步包括: 停止所述调度 RNTI有效定时器。
24、 如权利要求 22所述的方法, 其特征在于, 在终端接收所述调度 RNTI之后、 并且 终端监听使用所述调度 RNTI加扰的 PDCCH之前, 进一步包括: 终端启动调度 RNTI有 效定时器; 以及,
终端在所述调度 RNTI有效定时器超时时,若还未释放所述调度 RNTI,则释放所述调 度 RNTI并停止监听所述 PDCCH。
25、 如权利要求 15-19中任一所述的方法, 其特征在于, 所述终端是与网络侧不存在 无线资源控制 RRC连接的终端。
26、 一种基站, 其特征在于, 该基站包括:
信息处理单元, 用于将用于调度资源的调度无线网络临时标识 RNTI, 下发给终端; 数据传输单元, 用于基站为终端建立上下文, 根据该上下文通过使用所述调度 RNTI 加扰的物理下行控制信道 PDCCH, 为终端调度上行资源和 /或下行资源, 并在调度的上行 资源上接收终端发送的上行数据 , 在调度的下行资源上向终端发送下行数据。
27、 如权利要求 26所述的基站, 其特征在于, 所述信息处理单元用于:
在接收到核心网设备的寻呼消息后, 向终端下发携带所述调度 RNTI的寻呼消息。
28、 如权利要求 27所述的基站, 其特征在于, 所述信息处理单元还用于:
在向终端下发寻呼消息之后、 并且为终端建立上下文之前, 接收终端发送的用于请求 随机接入的消息 1 , 该消息 1中携带随机接入前导 preamble码;
向终端发送用于响应随机接入请求的消息 2 , 该消息 2中携带上行定时提前量 TA和 小区 RNTI;
接收终端发送的携带所述调度 RNTI的消息 3 ,并释放所述消息 2中携带的小区 RNTI。
29、 如权利要求 26所述的基站, 其特征在于, 所述信息处理单元用于: 在接收到核心网设备的寻呼消息后,向终端下发携带专用前导 preamble码的寻呼消息, 该专用 preamble码与用于终端随机接入的 preamble码不同;
接收终端发送的用于请求随机接入的消息 1 , 该消息 1中携带所述专用 preamble码, 向终端发送用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTI。
30、 如权利要求 29所述的基站, 其特征在于, 所述信息处理单元还用于:
在向终端发送消息 2之后、 并且为终端建立上下文之前, 接收终端发送的消息 3 , 该 消息 3中携带所述调度 RNTI。
31、 如权利要求 28或 30所述的基站, 其特征在于, 所述数据传输单元用于: 若根据所述消息 3中携带的緩存状态请求 BSR信息确定终端有上行数据需要发送,则 根据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度上行资源和下行资源; 否则, 根据该上下文通过使用所述调度 RNTI加扰的 PDCCH为终端调度下行资源。
32、 如权利要求 26-30中任一所述的基站, 其特征在于, 所述数据传输单元还用于: 在调度的上行资源上接收终端发送的上行数据后, 根据接收情况向终端发送肯定应答
ACK或否定应答 NACK信息。
33、 如权利要求 26-30中任一所述的基站, 其特征在于, 所述数据传输单元还用于: 若仅为终端调度下行资源, 则在发送给终端的最后一个下行数据中携带释放所述调度 RNTI的指示信息; 若接收到终端反馈的对所述最后一个下行数据的 ACK信息, 则释放所 述调度 RNTI以及所述上下文, 否则, 向终端重发携带所述指示信息的最后一个下行数据; 或者,
若为终端调度下行资源和上行资源, 则釆用如下方式 A或方式 B下发释放所述调度
RNTI 的指示信息: 方式 A: 在正确接收终端发送的上行数据并且根据该上行数据中携带 的 BSR信息确定该上行数据为终端发送的最后一个数据后,在发送给终端的最后一个下行 数据中携带释放所述调度 RNTI的指示信息; 若接收到终端反馈的对所述最后一个下行数 据的 ACK信息, 则释放所述调度 RNTI以及所述上下文, 否则, 向终端重发携带所述指示 信息的最后一个下行数据; 方式 B :在正确接收终端发送的上行数据并且根据该上行数据 中携带的 BSR信息确定该上行数据为终端发送的最后一个数据、以及向终端发送最后一个 下行数据后, 通过信令向终端发送释放所述调度 RNTI的指示信息;
或者,
若仅为终端调度上行资源, 则在正确接收终端发送的上行数据并且根据该上行数据中 携带的 BSR信息确定该上行数据为终端发送的最后一个数据后,向终端发送释放所述调度 RNTI 的指示信息; 若接收到终端反馈的对所述指示信息的 ACK信息, 则释放所述调度 RNTI以及所述上下文, 否则, 向终端重发所述指示信息。
34、 如权利要求 33所述的基站, 其特征在于, 所述数据传输单元还用于: 在为终端建立上下文之后、并且根据该上下文通过使用所述调度 RNTI加扰的 PDCCH 为终端调度上行资源和 /或下行资源之前, 启动调度 RNTI有效定时器; 以及,
在释放所述调度 RNTI以及所述上下文之后 , 停止所述调度 RNTI有效定时器。
35、 如权利要求 33所述的基站, 其特征在于, 所述数据传输单元还用于:
在为终端建立上下文之后、并且根据该上下文通过使用所述调度 RNTI加扰的 PDCCH 为终端调度上行资源和 /或下行资源之前, 启动调度 RNTI有效定时器; 以及,
在所述调度 RNTI有效定时器超时时, 若还未释放所述调度 RNTI以及所述上下文, 则释放所述调度 RNTI以及所述上下文。
36、 如权利要求 26-30中任一所述的基站, 其特征在于, 所述数据传输单元还用于: 将接收到的上行数据和 /或是否成功发送下行数据的传输确认信息发送给核心网设备。
37如权利要求 26-30中任一所述的基站, 其特征在于, 所述信息处理单元用于: 针对一个小区下发寻呼消息; 或者,
按照预定的轮流寻呼规则, 针对跟踪区 TA范围内的小区分别下发寻呼消息。
38、 如权利要求 27或 29所述的基站, 其特征在于, 所述信息处理单元用于: 根据核心网设备发送的寻呼消息中携带的数据传输特性信息, 确定本次数据传输需要 釆用不建立 RRC连接的数据传输方式后, 向终端下发所述寻呼消息。
39、 一种终端, 其特征在于, 该终端包括:
处理单元, 用于接收基站下发的用于调度资源的调度无线网络临时标识 RNTI;
传输单元,用于监听使用所述调度 RNTI加扰的物理下行控制信道 PDCCH,使用监听 到的 PDCCH所调度的上行资源发送上行数据 , 和 /或, 使用监听到的 PDCCH所调度的下 行资源接收下行数据。
40、 如权利要求 39所述的终端, 其特征在于, 所述处理单元用于:
接收基站下发的寻呼消息, 该寻呼消息中携带用于调度资源的调度 RNTI。
41、 如权利要求 40所述的终端, 其特征在于, 所述处理单元还用于:
在接收基站下发的寻呼消息之后、并且监听使用所述调度 RNTI加扰的 PDCCH之前, 向基站发送用于请求随机接入的消息 1 , 该消息 1中携带随机接入前导 preamble码;
接收基站发送的用于响应随机接入请求的消息 2 ,该消息 2中携带上行定时提前量 TA 和小区 RNTI; 并向基站发送携带所述调度 RNTI的消息 3。
42、 如权利要求 39所述的终端, 其特征在于, 所述处理单元用于:
接收基站下发的寻呼消息, 该寻呼消息中携带专用前导 preamble码, 该专用 preamble 码与终端进行随机接入所使用的 preamble码不同;
向基站发送用于请求随机接入的消息 1 , 该消息 1中携带所述专用 preamble码; 接收基站发送的用于响应随机接入请求的消息 2, 该消息 2中携带所述调度 RNTI。 43、 如权利要求 42所述的终端, 其特征在于, 所述处理单元还用于: 在接收基站发送的消息 2之后、 并且监听使用所述调度 RNTI加扰的 PDCCH之前, 向基站发送携带所述调度 RNTI的消息 3。
44、 如权利要求 41或 43所述的终端, 其特征在于, 所述处理单元还用于: 在终端有上行数据需要发送时,向基站发送携带取值不为 0的緩存状态请求 BSR信息 的消息 3。
45、 如权利要求 39-43中任一所述的终端, 其特征在于, 所述传输单元还用于: 在使用监听到的 PDCCH所调度的下行资源接收下行数据后, 根据接收情况向基站发 送肯定应答 ACK或否定应答 NACK信息。
46、 如权利要求 39-43中任一所述的终端, 其特征在于, 所述传输单元还用于: 若正确接收基站发送的释放所述调度 RNTI的指示信息,则向基站反馈 ACK信息,并 释放所述调度 RNTI以及停止监听所述 PDCCH, 否则, 向基站反馈 NACK信息并继续监 听所述 PDCCH; 所述指示信息携带在下行数据或其他消息中。
47、 如权利要求 46所述的终端, 其特征在于, 所述传输单元还用于:
在接收所述调度 RNTI之后、 并且监听使用所述调度 RNTI加扰的 PDCCH之前, 启 动调度 RNTI有效定时器; 以及,
在释放所述调度 RNTI之后 , 停止所述调度 RNTI有效定时器。
48、 如权利要求 46所述的终端, 其特征在于, 所述传输单元还用于:
在接收所述调度 RNTI之后、 并且监听使用所述调度 RNTI加扰的 PDCCH之前, 启 动调度 RNTI有效定时器; 以及,
在所述调度 RNTI有效定时器超时时, 若还未释放所述调度 RNTI, 则释放所述调度 RNTI并停止监听所述 PDCCH。
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