WO2020063666A1 - 用户设备及其执行的方法、基站及其执行的方法、移动控制实体及其执行的方法 - Google Patents

用户设备及其执行的方法、基站及其执行的方法、移动控制实体及其执行的方法 Download PDF

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Publication number
WO2020063666A1
WO2020063666A1 PCT/CN2019/107801 CN2019107801W WO2020063666A1 WO 2020063666 A1 WO2020063666 A1 WO 2020063666A1 CN 2019107801 W CN2019107801 W CN 2019107801W WO 2020063666 A1 WO2020063666 A1 WO 2020063666A1
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Prior art keywords
downlink
edt
base station
indication information
rrc connection
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PCT/CN2019/107801
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English (en)
French (fr)
Inventor
常宁娟
罗超
刘仁茂
Original Assignee
夏普株式会社
常宁娟
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Application filed by 夏普株式会社, 常宁娟 filed Critical 夏普株式会社
Priority to EP19865918.7A priority Critical patent/EP3860245B1/en
Priority to KR1020217012279A priority patent/KR20210064329A/ko
Priority to US17/278,821 priority patent/US11653328B2/en
Publication of WO2020063666A1 publication Critical patent/WO2020063666A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/03—Protecting confidentiality, e.g. by encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H04W12/041—Key generation or derivation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H04W12/043—Key management, e.g. using generic bootstrapping architecture [GBA] using a trusted network node as an anchor
    • H04W12/0433—Key management protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/10—Integrity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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

Definitions

  • the present disclosure relates to the field of wireless communication technologies, and more particularly, the present disclosure relates to a method performed by a user equipment, a method performed by a user equipment, a base station, and a base station.
  • NB-IoT NarrowBand Internet Of Things
  • MTC Machine Type Communication
  • the amount of data to be transmitted by small data packet services over a period of time is relatively small, such as 1000 bits, that is, through a physical layer transmission block, that is, It can be transmitted, and in the existing mechanism, data transmission must be completed after completing the connection with the air interface for Radio Resource Control (RRC) connection status, which makes the signaling overhead for transmitting small data packets relatively large.
  • RRC Radio Resource Control
  • the user terminal data of MTC or NB-IoT is huge, it leads to more serious signaling overhead; at the same time, the excessive signaling overhead also causes unnecessary user terminal energy consumption.
  • the small data transmission enhancement of version 15 In order to enable the transmission of small data packets with less signaling overhead and achieve energy saving for user terminals (User Equipment), in the small data transmission enhancement of version 15, it is proposed that the UE may not enter the RRC connected state. Implement data transmission, such as sending small data and random access message 3 together during the random access process earlier.
  • the small data transmission enhancement scheme of version 15 enhances the uplink small data transmission mechanism, so that the UE can send data to the base station through the random access message 3 before the RRC connection is established, but due to the time relationship, there is no Transmission is discussed.
  • NB-IoT NarrowBand Internet Of Things
  • RP-181451 New WID (R16enhancement for NB-IoT) was approved.
  • mobile termination refers to the termination of service transmission is the user, that is, the downlink service transmission initiated by the network side is different from the uplink service transmission initiated by the user side (Mobile Originating). .
  • the present disclosure mainly proposes a solution on how to implement mobile early termination of downlink early small data transmission.
  • the present disclosure provides a method performed by a user equipment, a method performed by a user equipment, a base station, and a base station.
  • a method performed by a user equipment UE including: the UE receives a paging message from a base station; and the UE initiates an RRC connection establishment process or an RRC connection based on the paging message.
  • the recovery process it is determined whether to perform a downlink EDT preparation operation based on the downlink early data transmission EDT indication information.
  • the downlink EDT indication information is included in system information or the paging message.
  • the downlink EDT preparation operation when the downlink EDT indication information exists, the downlink EDT preparation operation is performed, and when the downlink EDT indication information does not exist, the downlink EDT preparation operation is not performed; or, in the downlink EDT, When the value of the indication information is 1 or TRUE, the downlink EDT preparation operation is performed. When the value of the downlink EDT indication information is 0 or FALSE, the downlink EDT preparation operation is not performed.
  • the downlink EDT indication information includes enhanced coverage level information
  • the UE determines whether to perform the downlink EDT preparation operation based on the enhanced coverage level information.
  • the downlink EDT indication information is a downlink EDT UE identity list included in the paging message, and when the UE identity of the UE is included in the downlink EDT UE identity list, the UE executes the The downlink EDT is ready for operation.
  • the downlink EDT indication information is an integer represented by M bits, and corresponds to a corresponding entry in a UE identity list included in the paging message.
  • the downlink EDT preparation operation includes at least one of the following operations: restoring the PDCP state corresponding to the DRB and / or SRB; rebuilding the PDCP entity of the DRB and / or SRB; if the most recent previous RRC connection release message is Provides a drb-continueROHC indication, and the UE recovers or establishes an RRC connection in the same cell, then instructs the lower layer to use the saved UE access layer for uplink and downlink and is configured with drb-continueROHC, for DRBs configured with a header compression protocol Continue header compression protocol context.
  • the drb-continueROHC indication was not provided in the previous RRC connection release message, or if the UE resumes or establishes an RRC connection in a different cell, it instructs the lower layer to use the saved UE access layer context to configure the
  • the DRB of the header compression protocol resets its header compression protocol context; restores the DRB and / or SRB; uses the saved NCC value, and derives the K eNB key based on the K ASME key associated with the current key K eNB ; derivation The KRRCint key associated with the previously configured integrity algorithm; derive the KRRCenc key and KUPenc key associated with the previously configured encryption algorithm; configure the lower layer to use the previous The integrity algorithm and the derived KRRCint key restore integrity protection for messages received and sent by the UE; configure the lower layer to use the previously configured encryption algorithm and the derived KRRCenc key to receive and send the subsequent UE.
  • Encryption / decryption of the message is restored; the lower layer is configured to use the previously configured encryption algorithm and the derived KUPenc key to immediately restore the encryption / decryption of the user data sent or received by the UE; restore security; and configure the lower layer to use EDT.
  • a user equipment UE comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, execute the method according to the context.
  • a method performed by a base station including: the base station sends a paging message to a user equipment UE; and transmitting EDT indication information through downlink early data, indicating to the UE that the Whether the downlink EDT preparation operation is performed when the paging message initiates the RRC connection establishment process or the RRC connection restoration process.
  • a base station including: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform a method according to a context.
  • FIG. 1 shows a flowchart of a method 100 performed by a user equipment UE based on an embodiment of the present disclosure.
  • FIG. 2 shows a flowchart of a method 200 performed by a base station based on an embodiment of the present disclosure.
  • FIG. 3 shows a block diagram of a user equipment 30 based on an embodiment of the present disclosure.
  • FIG. 4 shows a block diagram of a base station 40 based on an embodiment of the present disclosure.
  • the following takes the LTE mobile communication system and its subsequent evolved versions as an example application environment, and specifically describes various embodiments according to the present disclosure.
  • the present disclosure is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as NB-IoT systems, MTC systems, and can also be used in 5G next-generation wireless communication systems ( New Radio, NR).
  • NB-IoT systems such as NB-IoT systems, MTC systems
  • 5G next-generation wireless communication systems New Radio, NR.
  • the base station in this disclosure can be any type of base station, including NodeB, enhanced base station eNB, or 5G communication system base station gNB, or pico base station, pico base station, macro base station, home base station, etc .; the cell can also be any of the above Cell under the type base station.
  • the UE may refer to NB-IoT UE, Bandwidth Reduced Low Complexity (BL) UE, UE in enhanced coverage, or other UE such as 5G NR UE.
  • indication / indication and notification / notification or inform / information are interchangeable, and enhanced coverage and coverage enhancement are interchangeable.
  • Enhanced coverage level In the enhanced coverage technology, the degree of enhanced coverage is divided into multiple enhanced coverage levels. For example, in NB-IoT, the enhanced coverage level can be levels 0 to 2. In some enhanced coverage methods, each enhanced coverage level can correspond to a different set of wireless parameter configurations, such as random access configuration (such as PRACH (Physical Random Access)). For example, for a configuration with a high enhanced coverage level, more Number of repetitions, etc.
  • PRACH Physical Random Access
  • the paging message is used to notify the UE in the RRC idle state or the RRC inactive state that downlink data is about to arrive or notify the UE of system information update.
  • the paging message includes a list of UE identifications, as shown in the following code (the following only shows the content of the relevant paging message of the present disclosure, omitting the unrelated paging message part),
  • the UE After receiving the paging message, if the UE's identity is included in the paging message, the UE considers it to be paged, and the UE will have downlink data transmission. Subsequently, the UE initiates an RRC connection establishment or RRC connection restoration process to establish a connection with the network side, and responds to the received paging message to complete the downlink transmission.
  • Random Access Response The second message in the random access process. After receiving the random access preamble of the UE, the base station responds to the reception of the random access preamble by sending a random access response message.
  • the random access response message includes a time advance domain, an uplink grant domain, a UE identity domain, and the like.
  • message 3 refers collectively to the uplink transmission sent by the UE on the uplink resource indicated by the uplink grant contained in the RAR.
  • the corresponding RRC message in message 3 is the RRC connection establishment request message.
  • the corresponding RRC message in message 3 is the RRC connection restoration request message.
  • message 3 also includes upper-layer data included in message 3 and transmitted together.
  • the downlink message used to respond to message 3 is sent by the base station to the UE.
  • the message 4 may include a random access competition analysis identifier used by the UE for random access competition analysis to determine whether the current random access is successful; and may also include a downlink RRC message for responding to the RRC message in the message 3.
  • the RRC message in message 3 is an RRC early data request message
  • the RRC message in message 4 may be an RRC early data completion message
  • the RRC message in message 3 is an RRC connection establishment request message
  • message 4 contains The RRC message may be an RRC connection establishment message or an RRC connection rejection message.
  • the RRC message included in message 4 may be an RRC connection recovery message, an RRC connection rejection message, or an RRC Connection release message.
  • message 4 also contains user plane data (borne on the data radio bearer (DRB) or DRB) transmitted with message 4 or media access control including message 4.
  • DRB data radio bearer
  • Layer Medium Access Control, MAC
  • control plane cellular evolution packet service optimization cp-CIoT-EPS-Optimisation
  • up-CIoT-EPS-Optimisation user plane cellular evolution packet service optimization
  • NAS non-access stratum
  • SRB Signaling Radio Bearer
  • DRB data radio bearer
  • the UE and the eNB suspend the RRC connection (indicated by an RRC connection release message containing a suspend indication), save the UE context, and enter the RRC idle state.
  • the UE wants to perform data transmission, the UE initiates an RRC connection restoration process to the eNB (In this process, the UE sends an RRC connection restoration request message to the base station to initiate connection restoration, and the base station sends an RRC connection restoration message to the UE to instruct it to resume the RRC connection.
  • the UE saves the RRC idle state of the UE context. Although it is also called the RRC idle state, it can actually be regarded as an intermediate state between the RRC idle state and the connected state. This intermediate state can be considered as its defined RRC inactive state (RRC_inactive) in the 5G NR system.
  • the UE that initiated the RRC connection restoration procedure will wait to receive the RRC connection restoration message (message 4) after sending the RRC connection restoration request message (message 3). If the integrity check of the RRC connection recovery message fails, the UE performs the operation of leaving the RRC connected state (for the operation of the UE performing the operation of leaving the RRC connected state, see section 5.3.12 of 3GPP technical specification 36.331), that is to say, it may be affected by security aspects. The attack will end the RRC connection recovery process and directly enter the RRC idle state. If the integrity check of the RRC connection recovery message is successful, the UE continues to execute the content in the RRC connection recovery message and enters the RRC connection state.
  • the small data transmission optimization scheme in R15 optimizes the early small data transmission based on the above two schemes.
  • the early uplink small data transmission refers to the transmission of small data with message 3 during the random access process. Because this optimization method can complete data transmission at an earlier time than the traditional data transmission method, it is called early Data transmission. In this disclosure, small data (small data or small packets) can be equated with early data.
  • the UE indicates to the base station that it will perform EDT transmission by using EDT-specific PRACH transmission resources or random access preambles in the random access process.
  • the user plane data is included as a NAS PDU in the RRC message of message 3 and transmitted through the SRB.
  • user plane data and RRC messages (message 3) are multiplexed in the MAC layer to form the same MAC protocol data unit (PDU) for transmission.
  • User data is transmitted through DRB
  • the RRC message is transmitted through the SRB. This requires the UE to restore (or (re) activate) DRB and security when the EDT process is triggered, and to apply the radio configuration before the RRC suspend is applied to each protocol layer.
  • the restoration of security during the RRC process is based on the NCC obtained during the previous RRC connection to derive new security keys (including the encryption key and the integrity key). Furthermore, the NCC is based on the previous RRC connection. It is obtained in the RRC connection release message used to release the UE's RRC connection to cause the UE to enter the idle state of the pending RRC connection or the RRC inactive state. This is different from traditional non-EDT transmission, which only restores DRB / SRB and security based on the NCC configured in the RRC message after receiving message 4.
  • the UE can perform the preparations required for the EDT in advance when the EDT is initiated. For example, in the user plane solution, the UE resumes when the RRC process of the EDT is initiated. Security, SRB and DRB.
  • the downlink EDT if the downlink EDT is to be performed correctly, the UE also needs to prepare in advance for the EDT, but the so-called mobile-terminated downlink EDT is initiated by the base station.
  • the UE cannot know when the base station will Initiating downlink EDT, that is, for a mobile-terminated downlink transmission, the UE cannot determine whether the base station will use the EDT method, and therefore cannot determine when to prepare for the downlink EDT.
  • One possible solution is that in a mobile-terminated downlink transmission, after receiving a paging message, the UE with EDT function always prepares for the downlink EDL in advance, regardless of whether the transmission uses the downlink EDT mode at this time.
  • this solution is used when the cell where the UE resides is a version 15 base station, that is, a base station that does not support downlink EDT.
  • the security recovery mechanism of EDT and non-EDT transmission is different.
  • the UE uses the EDT security recovery mechanism, and the version 15 base station uses a non-EDT security recovery mechanism.
  • the security check fails, and the UE enters the idle state. Therefore, the present disclosure mainly provides a solution for how the UE determines whether the base station will use the EDT method when receiving a paging message.
  • FIG. 1 shows a flowchart of a method 100 performed by a user equipment based on an embodiment of the present disclosure.
  • step S101 the user equipment UE receives a paging message from a base station.
  • the paging message is used to inform the UE in the RRC idle state or inactive state that there is a downlink service transmission in the mobile terminated service transmission.
  • step S102 when the user equipment UE initiates an RRC connection establishment process or an RRC connection restoration process based on the received paging message, it determines whether to perform a downlink EDT preparation operation based on downlink early data transmission EDT indication information.
  • the user equipment UE receives the paging message, if its UE identity is included in the paging message, it initiates an RRC connection establishment process or an RRC connection restoration process.
  • the above-mentioned downlink EDT indication information may be included in the system information, or may be included in the paging message and sent by the base station.
  • a downlink EDT preparation operation may be performed when the downlink EDT instruction information exists, and a downlink EDT preparation operation may not be performed when the downlink EDT instruction information does not exist.
  • the downlink EDT preparation operation may be performed when the value of the downlink EDT indication information is 1 or TRUE, and the downlink EDT preparation operation may not be performed when the value of the downlink EDT indication information is 0 or FALSE.
  • the specific operation content of the downlink EDT preparation operation as an example, reference may be made to the preparation work in Embodiment 1 described below.
  • the foregoing downlink EDT indication information may include enhanced coverage level information, and the user equipment UE may determine whether to perform a downlink EDT preparation operation based on the enhanced coverage level information. Specifically, for example, if the downlink EDT indication information sent by the base station exists and the enhanced coverage level of the user equipment UE is less than or equal to a value configured in the downlink EDT indication information, the user UE initiates an RRC connection establishment process or an RRC connection. During the recovery process, preparations for downlink EDT are performed.
  • the user equipment UE initiates an RRC connection establishment process or an RRC connection During the recovery process, preparations for downlink EDT are not performed.
  • FIG. 2 shows a flowchart of a method 200 performed by the base station according to the embodiment of the present disclosure.
  • the base station sends a paging message to the user equipment UE.
  • the paging message is used to inform the UE in the RRC idle state or inactive state that there is a downlink service transmission in the mobile terminated service transmission.
  • step S202 the base station indicates to the user equipment UE whether to perform a downlink EDT preparation operation when the RRC connection establishment process or the RRC connection restoration process is initiated based on the paging message through the downlink EDT indication information.
  • FIG. 3 shows a block diagram of a user equipment 30 according to an embodiment of the present disclosure.
  • the user equipment 30 includes a processor 301 and a memory 302.
  • the processor 301 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 302 may include, for example, volatile memory (e.g., random access memory RAM), hard disk drive (HDD), non-volatile memory (e.g., flash memory), or other memory systems.
  • the memory 302 stores program instructions. When the instruction is executed by the processor 301, the method described in detail in the present disclosure and executed by the user equipment may be executed.
  • FIG. 4 shows a block diagram of a base station 40 according to an embodiment of the present disclosure.
  • the base station 40 includes a processor 401 and a memory 402.
  • the base station 40 in the present disclosure may be any type of base station, including but not limited to: Node B, enhanced base station eNB, 5G communication system base station gNB, or pico base station, pico base station, macro base station, home base station, and the like.
  • the processor 401 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 402 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory systems.
  • the memory 402 stores program instructions. When the instruction is executed by the processor 401, the above-mentioned method performed by the base station, which is described in detail in the present disclosure, may be performed.
  • This embodiment 1 provides a method performed by the UE to determine whether to use the EDT method to initiate mobile terminated service transmission.
  • Step 1 The UE receives downlink EDT indication information from the base station.
  • the indication information is included in system information, such as system information block 1 or system information block 2.
  • this step further includes storing the received downlink EDT indication information by the UE. Step 1 is optional.
  • the downlink EDT indication information is used to indicate (whether) the cell supports or allows downlink EDT. In other words, it is used to indicate whether the UE is allowed to downlink EDT. In an implementation manner, if the downlink EDT indication information exists, the UE considers that the cell supports or allows the downlink EDT, and if the downlink EDT indication information does not exist, the UE considers that the cell does not support or allow the downlink EDT. In another implementation manner, if the downlink EDT indication information is set to 1 or TRUE, the UE considers that the cell supports or allows downlink EDT, and if the downlink EDT indication information is set to 0 or FALSE, the UE considers the cell Downstream EDT is not supported or allowed.
  • Step 2 The UE receives a paging message from the base station.
  • the paging message is used to inform the UE in the RRC idle state or inactive state that there is a downlink service transmission in the mobile terminated service transmission.
  • Step 3 If the UE receives the paging message, if its UE identification (such as International Mobile Subscriber Identity (IMSI) or System Architecture Evolution Temporary Mobile Station Identifier (S-TMSI) Or inactive wireless network temporary identifier (I-RNTI) is included in the paging message, and initiates an RRC connection establishment process or an RRC connection restoration process to establish a connection with the network side.
  • UE identification such as International Mobile Subscriber Identity (IMSI) or System Architecture Evolution Temporary Mobile Station Identifier (S-TMSI) Or inactive wireless network temporary identifier (I-RNTI) is included in the paging message
  • IMSI International Mobile Subscriber Identity
  • S-TMSI System Architecture Evolution Temporary Mobile Station Identifier
  • I-RNTI inactive wireless network temporary identifier
  • the initiation The reason for the establishment of the RRC connection establishment process or the RRC connection restoration process is mt-access.
  • the UE initiates the RRC connection establishment process or RRC During the connection restoration process, preparations for downlink EDT are performed.
  • the UE is in When the RRC connection establishment process or the RRC connection restoration process is initiated, preparations for downlink EDT are not performed.
  • the user Scheme i.e., if the UE being initiated user plane EDT (UP-EDT)
  • perform the downlink EDT preparation comprises one or more of the following operations:
  • ⁇ Restore the PDCP states corresponding to the DRB and / or SRB; preferably, restore the PDCP states corresponding to all DRBs and all SRBs.
  • the drb-continueROHC indication is provided in the recent previous RRC connection release message, and the UE resumes or establishes an RRC connection in the same cell, it instructs the lower layer to use the saved UE access layer for uplink and downlink and drb-continueROHC is configured, Continue the header compression protocol context for the DRB configured with the header compression protocol; otherwise (if the drb-continueROHC indication was not provided in the most recent previous RRC connection release message, or the UE resumes or establishes an RRC connection in a different cell), instruct the lower layer to use all
  • the saved UE access layer context resets the header compression protocol context for the DRB configured with the header compression protocol.
  • drb-continueROHC is used to instruct the DRB configured with the header compression protocol to continue the header compression protocol context. If drb-continueROHC is not configured, the DRB configured with the header compression protocol is reset to reset its header compression protocol context.
  • Embodiment 2 differs from Embodiment 1 in that the downlink EDT indication information further includes enhanced coverage level information. This embodiment is performed on the UE.
  • Step 1 The UE receives downlink EDT indication information from the base station.
  • the indication information is included in system information, such as system information block 1 or system information block 2.
  • this step further includes storing the received downlink EDT indication information by the UE. Step 1 is optional.
  • the downlink EDT indication information is used to indicate (whether) the cell supports or allows downlink EDT. In other words, it is used to indicate whether the UE is allowed to downlink EDT. Furthermore, the downlink EDT indication information includes enhanced coverage level information, which is used to indicate that the cell supports or allows the enhanced coverage level of the downlink EDT. In an implementation manner, the downlink EDT indication information includes an integer N. If the UE's enhanced coverage level is greater than or equal to N, the downlink EDT is not supported or allowed, and if the UE's enhanced coverage level is less than or equal to N, support or allow the use of downlink EDT.
  • Step 2 The UE receives a paging message from the base station.
  • the paging message is used to inform the UE in the RRC idle state or inactive state that there is a downlink service transmission in the mobile terminated service transmission.
  • Step 3 The UE receiving the paging message, if its UE identity (such as International Mobile Subscriber Identity (IMSI) or S-TMSI or I-RNTI) is included in the paging message, initiates the RRC connection establishment process Or the RRC connection restoration process to establish a connection with the network side, preferably, the reason for the establishment of the initiated RRC connection establishment process or the RRC connection restoration process is mt-access. If the downlink EDT indication information sent by the base station in step 1 exists and the UE's enhanced coverage level is less than or equal to the value configured in the downlink EDT indication information, the UE executes the downlink when the RRC connection establishment process or the RRC connection restoration process is initiated. EDT preparation.
  • IMSI International Mobile Subscriber Identity
  • the UE initiates an RRC connection establishment process or RRC During the connection restoration process, preparations for downlink EDT are not performed. If in the user plane solution (that is, if the UE is initiating a user plane EDT (UP-EDT)), the preparation for performing downlink EDT is the same as that in Embodiment 1, and is not repeated here.
  • the user plane solution that is, if the UE is initiating a user plane EDT (UP-EDT)
  • the preparation for performing downlink EDT is the same as that in Embodiment 1, and is not repeated here.
  • Embodiment 3 of the present invention will be described.
  • This embodiment 3 is different from the embodiment 1 in that the downlink EDT indication information is included in a paging message. This embodiment is performed on the UE.
  • Step 1 The UE receives a paging message including downlink EDT indication information from the base station.
  • the paging message is used to inform the UE in the RRC idle state or inactive state that there is a downlink service transmission in the mobile terminated service transmission.
  • the downlink EDT indication information is used to indicate whether the downlink EDT mode is used for the current downlink service (whether or not). In other words, it is used to indicate whether the UE uses the downlink EDT to initiate a subsequent RRC connection establishment / recovery procedure.
  • the downlink service (not) using the downlink EDT mode may also be expressed as the fact that the current paging (not) is for user data transmission in the downlink EDT mode.
  • the method for implementing the downlink EDT indication information is described in subsequent embodiments 4 to 5, but it is worth noting that the embodiments 4 to 5 are merely examples, and the present disclosure does not limit the method for implementing the downlink EDT indication information.
  • Step 2 The UE receiving the paging message, if its UE identification (such as IMSI or S-TMSI or I-RNTI) is included in the paging message, initiates an RRC connection establishment process or an RRC connection restoration process to establish a connection with the network side. contact.
  • the reason for the establishment of the initiated RRC connection establishment process or the RRC connection restoration process is mt-access.
  • the UE determines whether the downlink EDT mode is used for the downlink transmission, that is, whether to perform preparations for the downlink EDT, according to the downlink EDT identification information in the received paging message.
  • the UE performs preparations for downlink EDT when initiating an RRC connection establishment process or an RRC connection restoration process.
  • the UE does not perform preparations for downlink EDT when initiating the RRC connection establishment process or the RRC connection recovery process.
  • the operations included in the preparation for performing downlink EDT are the same as those described in Embodiment 1, and are not repeated here.
  • This embodiment 4 provides a method for the UE to determine whether the current transmission uses downlink EDT.
  • the UE if the downlink EDT indication information associated with the UE exists or is set to TRUE in the paging message, the UE considers that the downlink EDT mode is used for this downlink service. If the downlink EDT indication information does not exist, then The UE does not believe that the downlink EDT mode is used for this downlink service.
  • the downlink EDT indication information (such as the following EDTindication-r16 information element) is included in the pagingrecord information element in the paging message, and the information element includes a UE identifier, indicating the paging message. Is associated with the UE corresponding to the UE identity.
  • PagingRecord-NB-r13 :: SEQUENCE ⁇
  • the UE considers that the downlink service uses the downlink EDT mode. If the downlink EDT indication information is set to 0, the UE considers the Downlink services do not use the downlink EDT method.
  • PagingRecord-NB-r13 :: SEQUENCE ⁇
  • This embodiment 5 provides a method for the UE to determine whether the current transmission uses downlink EDT.
  • a new UE identity list (such as the pagingrecordlist-r16 information element) is introduced in the paging message, and the UE indicated by the UE identity in the new UE identity list
  • the downlink transmission triggered by this paging message uses the EDT method. Specifically, if the UE identity is included in the new UE identity list in the paging message, the UE considers that the downlink service uses the downlink EDT method. If the UE identity is not included in the new UE identity list in the paging message (That is, included in the traditional pagingrecondlist), the UE considers that the downlink EDT mode is not used in this downlink service.
  • the downlink EDT indication information (such as the following pagingrecordlist-r16 information element) is a new paging UE identification list in the paging message.
  • Paging-NB :: SEQUENCE ⁇
  • This embodiment 6 provides a method for the UE to determine whether the current transmission uses downlink EDT.
  • a downlink EDT indication information is introduced in the paging message.
  • the downlink EDT indication information may be an integer represented by M bits.
  • the value corresponds to the corresponding entry in the UE identity list. For example, if the value of the downlink EDT indication information is set to N, it means that the downlink transmission of the UE corresponding to the first N (or the last N) UE identification entries in the UE identification list (that is, the pagingrecordlist) uses the EDT mode.
  • the UE receiving the paging message if its UE identification is included in the UE identification list in the paging message, and if the downlink EDT indication information value N is configured and the UE identification is in the first N (or the last N) of the UE identification list ), The UE considers that the subsequent downlink transmission is an EDT mode.
  • the UE uses the EDT method when initiating the corresponding RRC connection establishment or RRC connection recovery process, that is, performs a preparation operation for downlink EDT.
  • the UE considers whether the subsequent downlink transmission is an EDT mode.
  • the UE does not use the EDT method when initiating the corresponding RRC connection establishment or RRC connection recovery process, that is, it does not perform a preparation operation for downlink EDT.
  • the downlink EDT indication information (such as the EDTindication-r16 information element below) is included in the paging message and is an integer.
  • the embodiments based on the user equipment UE have been described above, that is, the embodiments 1 to 6 executed on the user equipment UE have been described.
  • the following embodiments are implemented on the base station, and correspond to Embodiments 1 to 6 performed on the UE.
  • Embodiment 7 A method for initiating mobile terminated service transmission using the EDT method is provided in Embodiment 7.
  • Step 1 The base station sends downlink EDT indication information to the UE.
  • the indication information is included in system information, such as system information block 1 or system information block 2.
  • Step 1 is optional.
  • the downlink EDT indication information is used to indicate (whether) the cell supports or allows downlink EDT. In other words, it is used to indicate whether the UE is allowed to downlink EDT.
  • the base station sets the downlink EDT indication information to exist; if the cell does not support or does not allow downlink EDT, the base station sets the downlink EDT indication information to not exist.
  • the base station sets the downlink EDT indication information to 1 or TRUE. If the cell does not support or permits downlink EDT, the base station sets the downlink EDT indication. The message is 0 or FALSE.
  • Step 2 The base station sends a paging message.
  • the paging message is used to inform the UE in the RRC idle state or inactive state that there is a downlink service transmission in the mobile terminated service transmission.
  • Step 3 If the base station instructs the cell to support or allow downlink EDT in step 1, the base station considers that the UE has performed an EDT preparation operation during the RRC connection establishment or RRC connection recovery process in response to the paging message, and the base station uses the UE access layer context The NCC saved in the IP address is used to derive the relevant security key and activate security for sending message 4. If the base station indicates in step 1 that the cell does not support or does not allow downlink EDT, the base station considers that the UE is responding to the RRC of the paging message. During the connection establishment or RRC connection restoration process, no EDT preparation operation is performed. The base station allocates a new NCC for the UE in message 4, and based on the NCC, derives the relevant security key and activates security for sending the message 4.
  • Embodiment 8 of the present invention is described below. This embodiment 8 is different from Embodiment 7 in that the downlink EDT indication information further includes enhanced coverage level information.
  • Step 1 The base station sends downlink EDT indication information to the UE.
  • the indication information is included in system information, such as system information block 1 or system information block 2.
  • Step 1 is optional.
  • the downlink EDT indication information is used to indicate (whether) the cell supports or allows downlink EDT. In other words, it is used to indicate whether the UE is allowed to downlink EDT.
  • the base station sets the downlink EDT indication information to exist; if the cell does not support or does not allow downlink EDT, the base station sets the downlink EDT indication information to not exist.
  • the base station sets the downlink EDT indication information to 1 or TRUE. If the cell does not support or permits downlink EDT, the base station sets the downlink EDT indication. The message is 0 or FALSE.
  • the downlink EDT indication information is used to indicate (whether) the cell supports or allows downlink EDT. In other words, it is used to indicate whether the UE is allowed to downlink EDT. Furthermore, the downlink EDT indication information includes enhanced coverage level information, which is used to indicate that the cell supports or allows the enhanced coverage level of the downlink EDT. In an implementation manner, the downlink EDT indication information includes an integer N. If the UE's enhanced coverage level is greater than or equal to N, the downlink EDT is not supported or allowed, and if the UE's enhanced coverage level is less than or equal to N, support or allow the use of downlink EDT.
  • Step 2 The base station sends a paging message to the UE.
  • the paging message is used to inform the UE in the RRC idle state or inactive state that there is a downlink service transmission in the mobile terminated service transmission.
  • Step 3 If the downlink EDT indication information sent by the base station in step 1 exists, and the enhanced coverage level of the UE learned by the base station is less than or equal to the value configured in the downlink EDT indication information, the base station considers that the UE is responding to the paging message. During the RRC connection establishment or RRC connection restoration process, the EDT preparation operation is performed. The base station uses the NCC saved in the context of the UE access layer to derive the relevant security key and activate the security for sending the message 4.
  • the base station If the base station in step 1 The unsent downlink EDT indication information or the enhanced coverage level of the UE learned by the base station is greater than or equal to the value configured in the downlink EDT indication information, the base station considers that the UE is in the process of establishing an RRC connection or recovering the RRC connection in response to the paging message.
  • the EDT preparation operation has not been performed, the base station allocates a new NCC for the UE in the message 4, and based on the NCC, derives the relevant security key and activates the security for the transmission of the message 4.
  • Embodiment 9 of the present invention is different from Embodiment 7 in that the downlink EDT indication information is included in a paging message. This embodiment is performed on the UE.
  • Step 1 The base station sends a paging message including downlink EDT indication information to the UE.
  • the paging message is used to inform the UE in the RRC idle state or inactive state that there is a downlink service transmission in the mobile terminated service transmission.
  • the downlink EDT indication information is used to indicate whether the downlink EDT mode is used for the current downlink service (whether or not). In other words, it is used to indicate whether the UE uses the downlink EDT to initiate a subsequent RRC connection establishment / recovery procedure.
  • the downlink service (not) using the downlink EDT mode may also be expressed as the fact that the current paging (not) is for user data transmission in the downlink EDT mode.
  • the implementation method of the downlink EDT indication information is described in subsequent embodiments 10 to 12, but it is worth noting that embodiments 10 to 12 are merely examples, and the present disclosure does not limit the implementation method of the downlink EDT indication information.
  • Step 2 If the paging message sent by the base station in step 1 indicates that the downlink EDT indication information associated with a UE indicates that the downlink EDT mode is used for this downlink transmission of the UE, the base station considers that the UE is responding to the RRC of the paging message During the connection establishment or RRC connection restoration process, the EDT preparation operation is performed. The base station uses the NCC saved in the context of the UE access layer to derive the relevant security key and activate security for sending message 4. If in step 1, the base station The paging message sent to the downlink EDT associated with a UE is only information knowledge. The downlink EDT is not used for this UE's downlink transmission.
  • the base station considers that the UE has not responded to the RRC connection establishment or RRC connection recovery process in response to the paging message.
  • the EDT preparation operation is performed, the base station allocates a new NCC for the UE in message 4, and based on the NCC, derives the relevant security key and activates security for sending the message 4;
  • Embodiment 10 of the present invention provides a method for setting downlink EDT indication information.
  • the base station if the base station confirms that the UE uses the downlink EDT method for the current downlink service, the downlink EDT indication information associated with the UE in the paging message exists or is set to TRUE or 1; if the base station confirms that the UE this time If the downlink service does not use the downlink EDT mode, the downlink EDT indication information associated with the UE in the paging message does not exist or is set to FALSE or 0.
  • the downlink EDT indication information (such as the following EDTindication-r16 information element) is included in the pagingrecord information element in the paging message, and the information element includes a UE identifier, indicating the paging message. Is associated with the UE corresponding to the UE identity.
  • PagingRecord-NB-r13 :: SEQUENCE ⁇
  • PagingRecord-NB-r13 :: SEQUENCE ⁇
  • Embodiment 11 of the present invention provides a method for setting downlink EDT indication information.
  • a new UE identity list (such as the pagingrecordlist-r16 information element) is introduced in the paging message, and the UE indicated by the UE identity in the new UE identity list
  • the downlink transmission triggered by this paging message uses the EDT method.
  • the base station determines that a UE uses the downlink EDT method for this downlink service, the base station includes the UE identity in the paging message in a new UE identity list; if the base station determines that a UE does not use the downlink EDT for this downlink service Method, the base station excludes the UE identity in the paging message from the new UE identity list (that is, it includes the traditional pagingrecondlist).
  • the downlink EDT indication information (such as the following pagingrecordlist-r16 information element) is a new paging UE identification list in the paging message.
  • Paging-NB :: SEQUENCE ⁇
  • the twelfth embodiment provides a method for setting downlink EDT indication information.
  • a downlink EDT indication information is introduced in the paging message.
  • the downlink EDT indication information may be an integer represented by M bits.
  • the value corresponds to the corresponding entry in the UE identity list. For example, if the value of the downlink EDT indication information is set to N, it means that the downlink transmission of the UE corresponding to the first N (or the last N) UE identification entries in the UE identification list (that is, the pagingrecordlist) uses the EDT mode.
  • the base station determines that the current downlink transmission of a UE adopts the EDT method, the base station includes the downlink EDT indication information in a paging message, the value of which is set to N, and the UE identifier corresponding to the UE is included in the paging message. Among the first N (or last N) entries in the UE identification list. If the base station determines that the current downlink transmission of a UE does not use the EDT method, the base station does not include the downlink EDT indication information in the paging message, or includes the downlink EDT indication information with a value set to N, and sends the UE The corresponding UE identity is included in the last N (or first N) entries in the UE identity list in the paging message.
  • the downlink EDT indication information (such as the EDTindication-r16 information element below) is included in the paging message and is an integer.
  • Embodiment 9 when sending a paging message, the base station needs to determine whether the downlink EDT mode is used for the current downlink transmission of a UE. As described above, whether to use the EDT mode is mainly based on the judgment of the size of the service data. Judgment can also be made in conjunction with the UE's enhanced coverage level information.
  • This embodiment 13 provides a method for obtaining information about the amount of service data performed on a base station, to help the base station confirm whether to use the downlink EDT method for downlink transmission.
  • Step 1 The base station receives a paging message for a UE from a network-side entity (such as a Mobility Management Entity (MME)).
  • MME Mobility Management Entity
  • the paging message carries the downlink traffic size information of the downlink transmission associated with this paging.
  • the paging message also carries the enhanced coverage level information of the UE.
  • the downlink traffic size information may be a specific packet size value, such as X bits or X bytes; it may also be an integer, which is used to indicate the approximate data size, for example, 1 indicates that the data volume is 1 to 200 bits; 2 The data amount is 200 to 400 bits, and so on.
  • the downlink traffic size information on the MME may be obtained by the MME from a gateway entity (such as Serving Gateway), that is, obtained through the downlink traffic size information included in the downlink data notification message of the S11 interface.
  • a gateway entity such as Serving Gateway
  • Step 2 Based on the obtained downlink traffic size information, the base station may optionally determine whether the downlink transmission corresponding to the current paging of the UE uses the EDT method based on the obtained enhanced coverage level information of the UE. Preferably, if the determination result is yes, the base station includes downlink EDT indication information in the paging message of the air interface; if not, the base station does not include downlink EDT indication information in the paging message of the air interface.
  • This embodiment proposes a downlink EDT indication mode, which is performed on the UE.
  • the downlink EDT indication information is included in downlink control information (Downlink Control Information) and transmitted on a physical downlink control channel (Physical Downlink Control Channel, PDCCH).
  • Downlink Control Information Downlink Control Information
  • PDCCH Physical Downlink Control Channel
  • Step 1 The UE receives PDCCH signaling for downlink transmission of the scheduling message 4.
  • the PDCCH signaling includes downlink EDT indication information.
  • the downlink EDT indication information is as described above, and is used to indicate that the message 4 in step 2 includes downlink EDT data.
  • Step 1 also includes the transmission of the first three messages initiated by the UE and performing the random access procedure, including sending a random access preamble, receiving a RAR, and sending a message 3.
  • Step 2 The UE receives transmission of a physical downlink shared channel (Physical Downlink, Shared Chanel) including message 4.
  • a physical downlink shared channel Physical Downlink, Shared Chanel
  • Step 3 If the UE judges that the random access competition is successfully resolved based on the contention resolution identifier MAC control element in message 4, and if the PDCCH information received in step 1 includes downlink EDT indication information, the UE sets the downlink EDT
  • the indication information informs the upper layer that the upper layer is at least an RRC layer, and alternatively, it may be a MAC layer.
  • Step 4 The RRC layer receives the downlink EDT indication information from the lower layer, and then the RRC layer performs preparation work for the downlink EDT, and performs L2 processing on the message 4 in step 2 after the preparation work is completed.
  • preparation work of the downlink EDT refer to Embodiment 1, and details are not described herein.
  • This embodiment proposes a method for abandoning the EDT operation, which is performed on the UE.
  • the UE when the UE receives the (uplink) EDT cancellation instruction from the bottom layer, if the rollback (ie EDT cancellation) indicated by the bottom layer is in response to the RRC connection restoration request for (uplink) EDT, and The fallback is not because the uplink grant provided in the RAR is not used for EDT, and if the UE is not ready to receive downlink EDT, the UE performs abandonment of the user plane EDT. For the abandonment of the EDT, see Section 5.3.3.9a of 3GPP Protocol Specification Document 36.331.
  • the UE is not ready to receive a downlink EDT.
  • it may be expressed that the paging message received by the UE does not include a downlink EDT indication, or the UE does not receive a downlink EDT indication.
  • the program running on the device may be a program that causes a computer to realize the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU).
  • the program or information processed by the program may be temporarily stored in volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
  • a program for implementing the functions of the embodiments of the present disclosure may be recorded on a computer-readable recording medium.
  • Corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs.
  • the so-called “computer system” herein may be a computer system embedded in the device, and may include an operating system or hardware (such as a peripheral device).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium for a short-term dynamic storage program, or any other recording medium readable by a computer.
  • circuits designed to perform the functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete Gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit. In the event that new integrated circuit technologies have replaced existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.
  • present disclosure is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present disclosure is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

Abstract

本发明提供一种用户设备执行的方法、用户设备、基站执行的方法以及基站、移动控制实体执行的方法以及移动控制实体。所述用户设备执行的方法包括：所述UE从基站接收寻呼消息；和所述UE在基于所述寻呼消息发起RRC连接建立过程或RRC连接恢复过程时，基于下行早期数据传输EDT指示信息来判断是否执行下行EDT准备操作。

Description

用户设备及其执行的方法、基站及其执行的方法、移动控制实体及其执行的方法 技术领域
本公开涉及无线通信技术领域，更具体地，本公开涉及一种用户设备执行的方法、用户设备、基站执行的方法以及基站。
背景技术
2017年3月，在第三代合作伙伴计划(3rd Generation Partnership Project：3GPP)RAN#75次全会上，一个关于窄带物联网(NarrowBand Internet Of things，NB-IoT)进一步增强的新工作项目(参见RP-170852：New WID on Further NB-IoT enhancements)和一个关于机器类通信(Machine Type Communication：MTC)更进一步增强的新的工作项目(参见非专利文献：RP-170732：New WID on Even further enhanced MTC for LTE)获得批准。这两个研究项目的目标之一是针对小数据包业务的传输进行增强，考虑小数据包业务在一段时间内所要传输的数据量比较小，比如1000比特，即通过一个物理层的传输块即可传完，而现有机制中数据传输都必须在完成与空口的连接进行无线资源控制(Radio Resource Control，RRC)连接状态之后才能完成，这使得用于传输小数据包的信令开销比较大，考虑到MTC或NB-IoT的用户终端数据庞大，导致了更严重的信令开销；同时过大的信令开销也导致了不必要的用户终端能耗。为了使得能以较少的信令开销来完成小数据包的传输，并实现用户终端(User Equipment，UE)的节能，在版本15的小数据传输增强中，提出UE可以不进入RRC连接态来实现数据传输，比如在更早的时候在随机接入过程中将小数据和随机接入消息3一起发送。版本15的小数据传输增强方案对上行小数据传输机制进行了增强，使得UE在RRC连接建立之前通过随机接入消息3就可以将数据发送给基站，但由于时间关系，并没有对下行小数据传输进行讨论。
2018年6月，在第三代合作伙伴计划(3rd Generation Partnership Project：3GPP)RAN#80次全会上，一个关于窄带物联网(NarrowBand Internet Of things，NB-IoT)进一步增强的新工作项目(参见RP-181451：New WID on R16enhancement for NB-IoT)获得批准。这个研究项目的目标之一就是在NB-IoT网络中实现移动终止(Mobile Terminating)的下行早期小数据传输。其中，移动终止指的是业务传输的终止端是用户，即网络侧发起的下行业务传输，区别于用户侧发起(Mobile Originating)的上行业务传输。。
本公开主要就如何实现移动终止的下行早期小数据传输提出解决方法。
发明内容
为了解决上述问题，本公开提供一种用户设备执行的方法、用户设备、基站执行的方法以及基站。
根据本发明的第一方面，提供了一种用户设备UE执行的方法，包括：所述UE从基站接收寻呼消息；和所述UE在基于所述寻呼消息发起RRC连接建立过程或RRC连接恢复过程时，基于下行早期数据传输EDT指示信息来判断是否执行下行EDT准备操作。
在上述方法中，所述下行EDT指示信息包含在系统信息中或者所述寻呼消息中。
在上述方法中，在所述下行EDT指示信息存在时，执行所述下行EDT准备操作，在所述下行EDT指示信息不存在时，不执行所述下行EDT准备操作；或者，在所述下行EDT指示信息的值为1或TURE时，执行所述下行EDT准备操作，在所述下行EDT指示信息的值为0或FALSE时，不执行所述下行EDT准备操作。
在上述方法中，所述下行EDT指示信息包含增强覆盖等级信息，所述UE基于所述增强覆盖等级信息来判断是否执行所述下行EDT准备操作。
在上述方法中，所述下行EDT指示信息为所述寻呼消息中包含的下行EDT UE标识列表，在所述UE的UE标识包含在所述下行EDT UE标识列表时，所述UE执行所述下行EDT准备操作。
在上述方法中，所述下行EDT指示信息是用M比特表示的一个整数，且对应于所述寻呼消息中包含的UE标识列表中的对应的条目。
在上述方法中，所述下行EDT准备操作包含以下操作的至少一种操作： 恢复DRB和/或SRB对应的PDCP状态；重建DRB和/或SRB的PDCP实体；若最近之前的RRC连接释放消息中提供了drb-continueROHC指示，且所述UE在同一个小区内恢复或建立RRC连接，则指示下层使用所保存的UE接入层上下行且配置了drb-continueROHC，对配置了头压缩协议的DRB继续头压缩协议上下文，若最近之前的RRC连接释放消息中未提供drb-continueROHC指示，或者UE在不同小区内恢复或建立RRC连接，则指示下层使用所保存的UE接入层上下文，对配置了头压缩协议的DRB重置其头压缩协议上下文；恢复DRB和/或SRB；使用所保存的NCC的值，并基于当前密钥K eNB所关联的K ASME密钥派生出K eNB密钥；派生出先前配置的完整性算法所关联的KRRCint密钥；派生出先前配置的加密算法所关联KRRCenc密钥和KUPenc密钥；配置下层使用先前配置的完整性算法和派生出来的KRRCint密钥对后续所述UE接收和发送的消息恢复完整性保护；配置下层使用先前配置的加密算法和派生出来的KRRCenc密钥对后续所述UE接收和发送的消息恢复加密/解密；配置下层使用先前配置的加密算法和派生出来的KUPenc密钥立即对所述UE所发送或接收的用户数据恢复加密/解密；恢复安全；和配置下层使用EDT。
根据本发明的第二方面，提供了一种用户设备UE，包括：处理器；以及存储器，存储有指令；其中，所述指令在由所述处理器运行时执行根据上下文所述的方法。
根据本发明的第三方面，提供了一种基站执行的方法，包括：所述基站向用户设备UE发送寻呼消息；和通过下行早期数据传输EDT指示信息，向所述UE指示在基于所述寻呼消息发起RRC连接建立过程或RRC连接恢复过程时是否执行下行EDT准备操作。
根据本发明的第四方面，提供了一种基站，包括：处理器；以及存储器，存储有指令；其中，所述指令在由所述处理器运行时执行根据上下文所述的方法。
附图说明
通过下文结合附图的详细描述，本公开的上述和其它特征将会变得更加明显，其中：
图1示出了基于本公开的实施例的用户设备UE执行的方法100的流程图。
图2示出了基于本公开的实施例的基站执行的方法200的流程图。
图3示出了基于本公开的实施例的用户设备30的框图。
图4示出了基于本公开的实施例的基站40的框图。
具体实施方式
根据结合附图对本公开示例性实施例的以下详细描述，本公开的其它方面、优势和突出特征对于本领域技术人员将变得显而易见。
在本公开中，术语“包括”和“含有”及其派生词意为包括而非限制；术语“或”是包含性的，意为和/或。
在本说明书中，下述用于描述本公开原理的各种实施例只是说明，不应该以任何方式解释为限制公开的范围。参照附图的下述描述用于帮助全面理解由权利要求及其等同物限定的本公开的示例性实施例。下述描述包括多种具体细节来帮助理解，但这些细节应认为仅仅是示例性的。因此，本领域普通技术人员应认识到，在不背离本公开的范围和精神的情况下，可以对本文中描述的实施例进行多种改变和修改。此外，为了清楚和简洁起见，省略了公知功能和结构的描述。此外，贯穿附图，相同参考数字用于相似功能和操作。
下文以LTE移动通信系统及其后续的演进版本作为示例应用环境，具体描述了根据本公开的多个实施方式。然而，需要指出的是，本公开不限于以下实施方式，而是可适用于更多其它的无线通信系统，如NB-IoT系统中、MTC系统中，也可以用于5G下一代无线通信系统(New Radio，NR)中。
本公开中的基站可以是任何类型基站，包含Node B、增强基站eNB，也可以是5G通信系统基站gNB、或者微基站、微微基站、宏基站、家庭基站等；所述小区也可以是上述任何类型基站下的小区。UE可以指NB-IoT UE、带宽降低低复杂度(Bandwidth reduced Low complexity，BL)UE、或在增强覆盖(enhanced coverage)中的UE、也可以是其他UE如5G NR UE。本公开下述实施例中，指示(indicate/indication)和通知(notify/notification) 或知会/信息(inform/information)可以互换，增强覆盖与覆盖增强(coverage enhancement)可以互换。
不同的实施例之间也可以结合工作。
下面先对本公开涉及到的一些概念和进行说明。值得注意的是，在下文的描述中的一些命名仅是实例说明性的，而不是限制性的，也可以作其他命名。
增强覆盖等级：增强覆盖技术中将需要增强覆盖的程度分为多个增强覆盖等级，比如在NB-IoT中，增强覆盖等级可以是等级0～2。在一些增强覆盖方法中，每一个增强覆盖等级可以对应一套不同的无线参数配置，如随机接入配置(如PRACH(Physical Random Access CHannel)资源)，比如对增强覆盖等级高的配置更多的重复次数等。
寻呼(Paging)：寻呼消息用于在通知RRC空闲态或RRC不活动态的UE有下行数据将要到达或者通知UE系统信息的更新。当用于前者时，寻呼消息中包含一个UE标识列表，如下述代码中所示(下述仅示出了本公开相关寻呼消息的内容，略去了不相关的寻呼消息部分)，接收到寻呼消息的UE，若其标识包含在寻呼消息中，则UE认为其被寻呼到，该UE将有下行数据传输。随后UE会发起RRC连接建立或RRC连接恢复过程和网络侧建立联系，响应所收到的寻呼消息，完成下行传输。
Figure PCTCN2019107801-appb-000001
随机接入响应(Random Access Response，RAR)：随机接入过程中的第二条消息。基站会在接收到UE的随机接入前导之后，通过发送随机接入响应消息来对该随机接入前导的接收进行响应。随机接入响应消息中包括时间提前域、上行许可(uplink grant)域、UE标识域等。
消息3：随机接入过程中的第三条消息。在本公开中，消息3统指UE 在RAR中包含的上行许可所指示的上行资源上所发送的上行传输。如在RRC连接建立过程中，消息3中对应的RRC消息为RRC连接建立请求消息，在RRC连接恢复过程中，消息3中对应的RRC消息为RRC连接恢复请求消息。在本公开中，为了描述方便，除了所述RRC消息，有时消息3也包括包含在消息3中一起传输的上层数据。
消息4：随机接入过程中，用于响应消息3的下行消息，由基站发送给UE。在消息4中可以包含UE用于随机接入竞争解析的随机接入竞争解析标识以确定本次随机接入是否成功；还可以包括用于响应消息3中RRC消息的下行RRC消息。例如，当消息3中的RRC消息为RRC早期数据请求消息时，消息4中的RRC消息可以是RRC早期数据完成消息；当消息3中的RRC消息为RRC连接建立请求消息时，消息4中包含的RRC消息可以是RRC连接建立消息或RRC连接拒绝消息；当消息3中的RRC消息为RRC连接恢复请求消息时，消息4中包含的RRC消息可以是RRC连接恢复消息、RRC连接拒绝消息或RRC连接释放消息。在本公开中，为了描述方便，有时消息4也包含伴随消息4一起传输的用户面数据(承载在数据无线承载((user)Data Radio Bearer，DRB)上)或者包含消息4的媒介接入控制层(Medium Access Control，MAC)数据包。
控制面优化方案和用户面优化方案：
在R15之前的通信系统中，已经支持两种优化的数据传输方案，以用来降低数据传输的信令开销和UE能耗，称控制面蜂窝演进分组服务优化(cp-CIoT-EPS-Optimisation)和用户面蜂窝演进分组服务优化(up-CIoT-EPS-Optimisation)。在控制面蜂窝演进分组服务优化方案中，应用层的数据作为一个非接入层(Non Access Stratum，NAS)数据包包含在控制面的信令无线承载(Signalling Radio Bearer，SRB)上传输，可简称为控制面优化方案或控制面方案。在用户面蜂窝演进分组服务优化方案中，仍和传统系统中的数据传输一样应用层的数据在RRC连接状态下的数据无线承载((user)Data Radio Bearer，DRB)上传输，但在当数据传输完成后，UE和eNB挂起(suspend)RRC连接(通过包含挂起指示的RRC连接释放消息来指示)，保存UE上下文，进入RRC空闲状态。当UE要进行数据传输时，UE向eNB发起RRC连接恢复流程(在该流程中，UE向基站发送 RRC连接恢复请求消息来发起连接恢复，基站向UE发送RRC连接恢复消息来指示其恢复RRC连接，继而UE向基站反馈RRC连接恢复完成消息以进行响应)，因为UE和eNB上保存了UE上下文，通过该流程可以恢复其RRC连接、SRB、DRB和安全，无需重新建立RRC连接、DRB和安全。这种方案也可简称用户面优化方案或用户面方案。其中UE保存了UE上下文的RRC空闲态，虽然也称RRC空闲态，但实际上可以看做一个RRC空闲态和连接态的一个中间状态。这个中间状态，在5G NR系统中，可以认为是其定义的RRC非活动状态(RRC_inactive)。
在版本14的用户面方案中，发起了RRC连接恢复流程的UE在发送了RRC连接恢复请求消息(消息3)后，会等待接收RRC连接恢复消息(消息4)。如果RRC连接恢复消息的完整性校验失败，则UE执行离开RRC连接态的操作(UE执行离开RRC连接态的操作可参见3GPP技术规范36.331的5.3.12章节)，即认为可能受到了安全方面的攻击，会结束该RRC连接恢复过程而直接进入RRC空闲态。如果RRC连接恢复消息的完整性校验成功，则UE继续执行RRC连接恢复消息中的内容，并进入RRC连接状态。
R15中的早期数据传输(Early Data Transmission，EDT)：
R15中的小数据传输优化方案基于上述两种方案优化了早期小数据的传输。上行早期小数据传输指的是在随机接入过程中伴随消息3一起传输小数据，因为这种优化方式相较传统数据传输方式而言，能够在更早的时刻完成数据传输，所以称为早期数据传输，本公开中，小数据(small data或small packet)可等同于早期数据(early data)。对R15的上行早期数据传输，UE通过在随机接入过程中采用EDT特定的PRACH传输资源或随机接入前导来向基站指示其将要进行EDT传输。
对基于控制面方案的上行EDT，用户面数据作为NAS PDU包含在消息3的RRC消息中通过SRB完成传输。对基于用户面方案的上行EDT，用户面数据和RRC消息(消息3)在MAC层完成复用组包成同一个MAC协议数据单元(Protocol Data Unit，PDU)进行传输，用户数据是通过DRB传输而RRC消息是通过SRB传输的，这就要求UE在触发EDT过程时就要恢复(或称(重新)激活)DRB和安全，以及对各协议层应用RRC挂起 之前的无线配置，UE在该RRC过程中恢复安全是基于在前一次的RRC连接过程中获取的NCC来派生出新的安全秘钥(包括加密秘钥和完整性秘钥)的，更进一步地，NCC是从前一次的RRC连接过程中用于释放UE RRC连接使UE进入挂起RRC连接的空闲态或RRC inactive态的RRC连接释放消息中获取的。这不同于传统非EDT传输中只有在接收到消息4后基于RRC消息中配置的NCC才恢复DRB/SRB和安全。
在上述上行EDT中，因为上行EDT是由UE主动发起的，所以UE可以在EDT发起时，提前进行EDT所需的准备工作，比如在用户面方案中，UE在发起EDT的RRC过程时就恢复安全、SRB和DRB。而在下行EDT中，若要正确进行下行EDT，UE也需要提前进行EDT所需的准备工作，但所谓移动终止的下行EDT是由基站发起的，在当前的协议中UE无法获知基站何时会发起下行EDT，即对一个移动终止的下行传输而言，UE无法判定基站是否会使用EDT方式，因此也无法判定何时进行下行EDT的准备工作。有一种可能的解决方法是在一个移动终止的下行传输中，有EDT功能的UE在收到寻呼消息后，总是提前进行下行EDL的准备工作，不管此时传输是否使用下行EDT的方式。但这种解决方法在当UE所驻留的小区是版本15的基站即不支持下行EDT的基站时，如前所述，EDT和非EDT传输的安全恢复机制不一样，在这种场景下，UE使用的是EDT的安全恢复机制，而版本15的基站则采用的是非EDT的安全恢复机制，会导致UE和基站上的安全恢复状态不同步，加密和完整性校验的密钥不一致，从而使得安全校验失败，UE进入空闲状态。所以本公开主要就在接收到寻呼消息时UE如何判定基站是否会使用EDT方式给出解决方法。
下面，对本公开中的用户设备UE执行的方法进行说明，作为一例，图1中表示基于本公开的实施例的用户设备执行的方法100的流程图。
在步骤S101中，用户设备UE从基站接收寻呼消息。该寻呼消息用于在移动终止的业务传输中告知处于RRC空闲态或不活动态(inactive)的UE有下行业务传输。
在步骤S102中，用户设备UE在基于接收到的寻呼消息发起RRC连接建立过程或RRC连接恢复过程时，基于下行早期数据传输EDT指示信息 来判断是否执行下行EDT准备操作。
具体而言，收到寻呼消息的用户设备UE，若其UE标识包含在寻呼消息中，则发起RRC连接建立过程或RRC连接恢复过程。
上述的下行EDT指示信息可以包含在系统信息中，也可以包含在所述寻呼消息中，由基站进行发送。
此外，关于如何判断是否执行下行EDT准备操作，可以在在下行EDT指示信息存在时，执行下行EDT准备操作，在下行EDT指示信息不存在时，不执行下行EDT准备操作。此外，也可以在在下行EDT指示信息的值为1或TURE时，执行下行EDT准备操作，在下行EDT指示信息的值为0或FALSE时，不执行下行EDT准备操作。再有，关于该下行EDT准备操作的具体操作内容，作为一例，可以参照下述的实施例1中的准备工作。
另外，上述的下行EDT指示信息可以包含增强覆盖等级信息，用户设备UE可以基于增强覆盖等级信息来判断是否执行下行EDT准备操作。具体而言，例如，若基站发送的下行EDT指示信息存在，用户设备UE的增强覆盖等级小于或小于等于下行EDT指示信息中所配置的值，则用户贞UE在发起RRC连接建立过程或RRC连接恢复过程时，执行下行EDT的准备操作。另一方面，若未接收到基站发送的下行EDT指示信息或用户设备UE的增强覆盖等级大于或大于等于下行EDT指示信息中所配置的值，则用户设备UE在发起RRC连接建立过程或RRC连接恢复过程时，不执行下行EDT的准备工作。
此外，对本公开中的基站执行的方法进行说明，作为一例，图2中表示基于本公开的实施例的基站执行的方法200的流程图。
在步骤201中，基站向用户设备UE发送寻呼消息。该寻呼消息用于在移动终止的业务传输中告知处于RRC空闲态或不活动态(inactive)的UE有下行业务传输。
在步骤S202中，基站通过下行EDT指示信息，向用户设备UE指示在基于寻呼消息发起RRC连接建立过程或RRC连接恢复过程时是否执行下行EDT准备操作。
此外，图3示出了根据本公开实施例的用户设备30的框图。如图3所示，该用户设备30包括处理器301和存储器302。处理器301例如可以包括微处理器、微控制器、嵌入式处理器等。存储器302例如可以包括易失 性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统等。存储器302上存储有程序指令。该指令在由处理器301运行时，可以执行本公开详细描述的由用户设备执行的上述方法。
另外，图4示出了根据本公开实施例的基站40的框图。如图4所示，该基站40包括处理器401和存储器402。如上述所述，本公开中的基站40基站可以是任何类型基站，包含但不限于：Node B、增强基站eNB、5G通信系统基站gNB、或者微基站、微微基站、宏基站、家庭基站等。处理器401例如可以包括微处理器、微控制器、嵌入式处理器等。存储器402例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统等。存储器402上存储有程序指令。该指令在由处理器401运行时，可以执行本公开详细描述的由基站执行的上述方法。
以下，对本公开所涉及的具体实施例进行详细说明。另外，如上所述，本公开中的实施例是为了容易理解本发明而进行的示例性说明，并不是对本发明的限定。
实施例1：
下面，对本发明的实施例1进行说明。该实施例1给出了一种在UE上执行的UE判定是否使用EDT方式发起移动终止的业务传输的方法。
步骤1：UE从基站接收下行EDT指示信息，优选地，该指示信息包含在系统信息中，如系统信息块1或系统信息块2。优选地，该步骤还包括UE存储所收到的下行EDT指示信息。步骤1是可选的。
所述下行EDT指示信息，用于指示该小区(是否)支持或允许下行EDT。换句话说，用于指示UE是否被允许下行EDT。在一种实现方式中，若所述下行EDT指示信息存在，则UE认为该小区支持或允许下行EDT，若所述下行EDT指示信息不存在，则UE认为该小区不支持或不允许下行EDT。在另一种实现方式中，若所述下行EDT指示信息设置为1或TURE，则UE认为该小区支持或允许下行EDT，若所述下行EDT指示信息设置为0或FALSE，则UE认为该小区不支持或不允许下行EDT。
步骤2：UE从基站接收寻呼消息。该寻呼消息用于在移动终止的业务 传输中告知处于RRC空闲态或不活动态(inactive)的UE有下行业务传输。
步骤3：收到寻呼消息的UE，若其UE标识(如国际移动用标识(International Mobile Subscriber Identity，IMSI)或系统架构演进临时移动端标识(System Architecture Evolution Temporary Mobile Station Identifier，S-TMSI)或非激活态无线网络临时标识(Inactive Radio Network Temporary Identifier，I-RNTI)包含在寻呼消息中，发起RRC连接建立过程或RRC连接恢复过程来建立和网络侧的联系，优选地，所述发起的RRC连接建立过程或RRC连接恢复过程的建立原因是mt-access。若在步骤1中基站发送的下行EDT指示信息存在或其值置为1或TURE，则UE在发起RRC连接建立过程或RRC连接恢复过程时，执行下行EDT的准备工作。可选地，否则若在步骤1中未接收到基站发送的下行EDT指示信息或接收到的下行EDT指示信息值设置为0或FALSE，则UE在发起RRC连接建立过程或RRC连接恢复过程时，不执行下行EDT的准备工作。若在用户面方案中(即若UE正在发起用户面EDT(UP-EDT))，所述执行下行EDT的准备工作包括下述操作的一种或多种：
√恢复(restore)DRB和/或SRB对应的PDCP状态；优选地，恢复所有DRB和所有SRB对应的PDCP状态。
√重建DRB和/或SRB的PDCP实体；优选地，重建所有DRB和所有SRB的PDCP实体。
√若最近之前的RRC连接释放消息中提供了drb-continueROHC指示，且UE在同一个小区内恢复或建立RRC连接，则指示下层使用所保存的UE接入层上下行且配置了drb-continueROHC，对配置了头压缩协议的DRB继续头压缩协议上下文；否则(若最近之前的RRC连接释放消息中未提供drb-continueROHC指示，或UE在不同小区内恢复或建立RRC连接，)，指示下层使用所保存的UE接入层上下文，对配置了头压缩协议的DRB重置其头压缩协议上下文。其中，drb-continueROHC用于指示对配置了头压缩协议的DRB继续头压缩协议上下文，若drb-continueROHC不配置则对配置了头压缩协议的DRB重置(reset)其头压缩协议上下文。
√恢复(resume)DRB和/或SRB。优选地，恢复所有SRB和DRB。
√使用所保存的NCC的值，并基于当前密钥K eNB所关联的K ASME 密钥派生出K eNB密钥。
√派生出先前配置的完整性算法所关联的KRRCint密钥。
√派生出先前配置的加密算法所关联KRRCenc密钥和KUPenc密钥。
√配置下层使用先前配置的完整性算法和上述派生出来的KRRCint密钥对后续所有UE接收和发送的消息恢复完整性保护。
√配置下层使用先前配置的加密算法和上述派生出来的KRRCenc密钥对后续所有UE接收和发送的消息恢复加密/解密。
√配置下层使用先前配置的加密算法和上述派生出来的KUPenc密钥立即对UE所发送或接收的用户数据恢复加密/解密。
√恢复安全。
√配置下层使用EDT。
实施例2
以下，对本发明的实施例2进行说明。实施例2与实施例1的不同之处在于，所述下行EDT指示信息还包括了增强覆盖等级信息。该实施例在UE上执行。
步骤1：UE从基站接收下行EDT指示信息，优选地，该指示信息包含在系统信息中，如系统信息块1或系统信息块2。优选地，该步骤还包括UE存储所收到的下行EDT指示信息。步骤1是可选的。
所述下行EDT指示信息，用于指示该小区(是否)支持或允许下行EDT。换句话说，用于指示UE是否被允许下行EDT。更进一步地，所述下行EDT指示信息包含增强覆盖等级信息，用于指示该小区支持或允许下行EDT的增强覆盖等级。在一种实现方式中，所述下行EDT指示信息包含一个整数N，若UE的增强覆盖等级大于或大于等于N，则不支持或不允许使用下行EDT，若UE的增强覆盖等级小于或小于等于N，则支持或允许使用下行EDT。
步骤2：UE从基站接收寻呼消息。该寻呼消息用于在移动终止的业务传输中告知处于RRC空闲态或不活动态(inactive)的UE有下行业务传输。
步骤3：收到寻呼消息的UE，若其UE标识(如国际移动用标识(International Mobile Subscriber Identity，IMSI)或S-TMSI或I-RNTI)包含在寻呼消息中，发起RRC连接建立过程或RRC连接恢复过程来建立和 网络侧的联系，优选地，所述发起的RRC连接建立过程或RRC连接恢复过程的建立原因是mt-access。若在步骤1中基站发送的下行EDT指示信息存在，UE的增强覆盖等级小于或小于等于下行EDT指示信息中所配置的值，则UE在发起RRC连接建立过程或RRC连接恢复过程时，执行下行EDT的准备工作。可选地，否则若在步骤1中未接收到基站发送的下行EDT指示信息或UE的增强覆盖等级大于或大于等于下行EDT指示信息中所配置的值，则UE在发起RRC连接建立过程或RRC连接恢复过程时，不执行下行EDT的准备工作。若在用户面方案中(即若UE正在发起用户面EDT(UP-EDT))，所述执行下行EDT的准备工作与实施例1中一样，此处不赘述。
实施例3
以下，对本发明的实施例3进行说明。该实施例3与实施例1的不同在于，所述下行EDT指示信息包含在寻呼消息中。该实施例在UE上执行。
步骤1：UE从基站接收包含下行EDT指示信息的寻呼消息。该寻呼消息用于在移动终止的业务传输中告知处于RRC空闲态或不活动态(inactive)的UE有下行业务传输。
所述下行EDT指示信息，用于指示对本次下行业务(是否)使用下行EDT方式。换句话说，用于指示UE是否使用下行EDT来发起随后的RRC连接建立/恢复过程。所述本次下行业务(不)使用下行EDT方式也可以表述为本次寻呼(不)是对下行EDT方式的用户数据传输的。所述下行EDT指示信息的实现方法在后续实施例4～5中说明，但值得注意的是，实施例4～5仅为举例，本公开并不限定所述下行EDT指示信息的实现方法。
步骤2：收到寻呼消息的UE，若其UE标识(如IMSI或S-TMSI或I-RNTI)包含在寻呼消息中，发起RRC连接建立过程或RRC连接恢复过程来建立和网络侧的联系。优选地，所述发起的RRC连接建立过程或RRC连接恢复过程的建立原因是mt-access。。在发起RRC过程的时候，UE根据所接收到的寻呼消息中的下行EDT标识信息判断本次下行传输是否使用下行EDT方式，即是否执行下行EDT的准备工作。若判断的结果为是，则UE在发起RRC连接建立过程或RRC连接恢复过程时，执行下行EDT的准备工作。可选地，若判断的结果为否，则UE在发起RRC连接建立过程或RRC连接 恢复过程时，不执行下行EDT的准备工作。若在用户面方案中(即若UE正在发起用户面EDT(UP-EDT))，所述执行下行EDT的准备工作所包含的操作同实施例1中所述，此处不赘述。
实施例4
以下，对本发明的实施例4进行说明。该实施例4给出了一种UE判断本次传输是否使用下行EDT的方法。
在该实施例中，若寻呼消息中该UE关联的所述下行EDT指示信息存在或置为TURE，则UE认为本次下行业务使用下行EDT方式，若所述下行EDT指示信息不存在，则UE认为本次下行业务不使用下行EDT方式。
在这种实施方式中，所述下行EDT指示信息(如下面的EDTindication-r16信息元素)包含在寻呼消息中的pagingrecord信息元素中，该信息元素中包含一个UE标识，表示所述寻呼消息是关联到所述UE标识所对应的UE的。
PagingRecord-NB-r13：：＝SEQUENCE{
ue-Identity-r13 PagingUE-Identity，
EDTindication-r16 ENUMERATED{true}
…
}
在本实施例的另一中方式中，若所述下行EDT指示信息设置为1，则UE认为本次下行业务使用下行EDT方式，若所述下行EDT指示信息设置为0，则UE认为本次下行业务不使用下行EDT方式。
PagingRecord-NB-r13：：＝SEQUENCE{
ue-Identity-r13 PagingUE-Identity，
EDTindication-r16 BOOLEN
…
}
实施例5
以下，对本发明的实施例5进行说明。该实施例5给出了一种UE判断本次传输是否使用下行EDT的方法。
在该实施例中，在寻呼消息中除现有的UE标识列表之外，引入一个新的UE标识列表(如pagingrecordlist-r16信息元素)，新的UE标识列表中的UE标识所指示的UE的本次寻呼消息所触发的下行传输使用EDT方式。具体来说，若寻呼消息中该UE标识包含在新的UE标识列表中，则UE认为本次下行业务使用下行EDT方式，若寻呼消息中该UE标识不包含在新的UE标识列表中(即包含在传统pagingrecondlist中)，则UE认为本次下行业务不使用下行EDT方式。
在这种实施方式中，所述下行EDT指示信息(如下面的pagingrecordlist-r16信息元素)为在寻呼消息中的新的寻呼UE标识列表。
Paging-NB：：＝SEQUENCE{
    pagingRecordList-r13 PagingRecordList-NB-r13 OPTIONAL，
    pagingRecordList-r16 PagingRecordList-NB-r16 OPTIONAL，
    }
实施例6
以下，对本发明的实施例6进行说明。该实施例6给出了一种UE判断本次传输是否使用下行EDT的方法。
在该实施例中，在寻呼消息中除现有的UE标识列表之外，引入一个下行EDT指示信息，所述下行EDT指示信息可以是用M比特表示的一个整数，该下行EDT指示信息的值对应于UE标识列表中的对应的条目(entry)。举例来说，若该下行EDT指示信息的值设置为N，则表示对UE标识列表(即pagingrecordlist)中前N个(或后N个)UE标识条目所对应的UE的下行传输采用EDT方式。
收到寻呼消息的UE，若其UE标识包含在寻呼消息中的UE标识列表中，且若配置了下行EDT指示信息值N且UE标识处于UE标识列表中的前N个(或后N个)，则UE认为随后的下行传输是EDT方式。UE在发起对应的RRC连接建立或RRC连接恢复过程时使用EDT方式，即执行下行EDT的准备操作。可选地，否则若其UE标识包含在寻呼消息中的UE标识列表中，且若未配置下行EDT指示信息值N或UE标识不是处于UE标识列表中的前N个(或后N个)，则UE认为随后的下行传输是不是EDT方式。UE在发起对应的RRC连接建立或RRC连接恢复过程时不使用EDT 方式，即不执行下行EDT的准备操作。
在这种实施方式中，所述下行EDT指示信息(如下面的EDTindication-r16信息元素)包含在寻呼消息中，为一个整数。
Figure PCTCN2019107801-appb-000002
以上，对基于用户设备UE的实施例进行了说明，也就是说对在用户设备UE上执行的实施例1～6进行了说明。下面，对基于基站的实施例进行说明，下述实施例在基站上实施，对应于上述在UE上执行的实施例1～6。
实施例7
实施例7中给出了一种使用EDT方式发起移动终止的业务传输的方法。
步骤l：基站向UE发送下行EDT指示信息，优选地，该指示信息包含在系统信息中，如系统信息块1或系统信息块2。步骤1是可选的。
所述下行EDT指示信息，用于指示该小区(是否)支持或允许下行EDT。换句话说，用于指示UE是否被允许下行EDT。在一种实现方式中，若该小区支持或允许下行EDT，则基站设置所述下行EDT指示信息存在，若该小区不支持或不允许下行EDT，则基站设置所述下行EDT指示信息不存在。在另一种实现方式中，若该小区支持或允许下行EDT，则基站设置所述下行EDT指示信息为1或TURE，若该小区不支持或不允许下行EDT，则基站设置所述下行EDT指示信息为0或FALSE。
步骤2：基站发送寻呼消息。该寻呼消息用于在移动终止的业务传输中告知处于RRC空闲态或不活动态(inactive)的UE有下行业务传输。
步骤3：若步骤1中基站指示了本小区支持或允许下行EDT，则基站认为UE在响应寻呼消息的RRC连接建立或RRC连接恢复过程中执行了EDT准备操作，基站使用UE接入层上下文中所保存的NCC来派生相关安 全密钥并激活安全，用于消息4的发送；若步骤1中基站指示了本小区不支持或不允许下行EDT，则基站认为UE在响应寻呼消息的RRC连接建立或RRC连接恢复过程中未执行了EDT准备操作，基站为UE在消息4中分配新的NCC，并基于该NCC来派生相关安全密钥并激活安全，用于消息4的发送；
实施例8
以下对本发明的实施例8进行说明，该实施例8与实施例7的不同之处在于，所述下行EDT指示信息还包括了增强覆盖等级信息。
步骤1：基站向UE发送下行EDT指示信息，优选地，该指示信息包含在系统信息中，如系统信息块1或系统信息块2。步骤1是可选的。
所述下行EDT指示信息，用于指示该小区(是否)支持或允许下行EDT。换句话说，用于指示UE是否被允许下行EDT。在一种实现方式中，若该小区支持或允许下行EDT，则基站设置所述下行EDT指示信息存在，若该小区不支持或不允许下行EDT，则基站设置所述下行EDT指示信息不存在。在另一种实现方式中，若该小区支持或允许下行EDT，则基站设置所述下行EDT指示信息为1或TURE，若该小区不支持或不允许下行EDT，则基站设置所述下行EDT指示信息为0或FALSE。
所述下行EDT指示信息，用于指示该小区(是否)支持或允许下行EDT。换句话说，用于指示UE是否被允许下行EDT。更进一步地，所述下行EDT指示信息包含增强覆盖等级信息，用于指示该小区支持或允许下行EDT的增强覆盖等级。在一种实现方式中，所述下行EDT指示信息包含一个整数N，若UE的增强覆盖等级大于或大于等于N，则不支持或不允许使用下行EDT，若UE的增强覆盖等级小于或小于等于N，则支持或允许使用下行EDT。
步骤2：基站向UE发送寻呼消息。该寻呼消息用于在移动终止的业务传输中告知处于RRC空闲态或不活动态(inactive)的UE有下行业务传输。
步骤3：若在步骤1中基站发送的下行EDT指示信息存在，基站所获知的UE的增强覆盖等级小于或小于等于下行EDT指示信息中所配置的值，则基站认为UE在响应寻呼消息的RRC连接建立或RRC连接恢复过程中执行了EDT准备操作，基站使用UE接入层上下文中所保存的NCC来派生相 关安全密钥并激活安全，用于消息4的发送；若在步骤1中基站未发送的下行EDT指示信息或基站所获知的UE的增强覆盖等级大于或大于等于下行EDT指示信息中所配置的值，则基站认为UE在响应寻呼消息的RRC连接建立或RRC连接恢复过程中未执行了EDT准备操作，基站为UE在消息4中分配新的NCC，并基于该NCC来派生相关安全密钥并激活安全，用于消息4的发送。
实施例9
以下，对本发明的实施例9进行说明，该实施例9与实施例7的不同在于，所述下行EDT指示信息包含在寻呼消息中。该实施例在UE上执行。
步骤1：基站向UE发送包含下行EDT指示信息的寻呼消息。该寻呼消息用于在移动终止的业务传输中告知处于RRC空闲态或不活动态(inactive)的UE有下行业务传输。
所述下行EDT指示信息，用于指示对本次下行业务(是否)使用下行EDT方式。换句话说，用于指示UE是否使用下行EDT来发起随后的RRC连接建立/恢复过程。所述本次下行业务(不)使用下行EDT方式也可以表述为本次寻呼(不)是对下行EDT方式的用户数据传输的。所述下行EDT指示信息的实现方法在后续实施例10～12中说明，但值得注意的是，实施例10～12仅为举例，本公开并不限定所述下行EDT指示信息的实现方法。
步骤2：若在步骤1中，基站发送的寻呼消息中对一个UE所关联的下行EDT指示信息指示对该UE本次下行传输使用下行EDT方式，则基站认为UE在响应寻呼消息的RRC连接建立或RRC连接恢复过程中执行了EDT准备操作，基站使用UE接入层上下文中所保存的NCC来派生相关安全密钥并激活安全，用于消息4的发送；若在步骤1中，基站发送的寻呼消息中对一个UE所关联的下行EDT只是信息知识对该UE本次下行传输不使用下行EDT方式，则基站认为UE在响应寻呼消息的RRC连接建立或RRC连接恢复过程中未执行了EDT准备操作，基站为UE在消息4中分配新的NCC，并基于该NCC来派生相关安全密钥并激活安全，用于消息4的发送；
实施例10
以下，对本发明的实施例10进行说明，该实施例10给出了一种下行 EDT指示信息的设置方式。
在该实施例中，若基站确认该UE本次下行业务使用下行EDT方式，则寻呼消息中该UE关联的所述下行EDT指示信息存在或置为TURE或1；若基站确认该UE本次下行业务不使用下行EDT方式，则寻呼消息中该UE关联的所述下行EDT指示信息不存在或置为FALSE或0。
在这种实施方式中，所述下行EDT指示信息(如下面的EDTindication-r16信息元素)包含在寻呼消息中的pagingrecord信息元素中，该信息元素中包含一个UE标识，表示所述寻呼消息是关联到所述UE标识所对应的UE的。
PagingRecord-NB-r13：：＝SEQUENCE{
ue-Identity-r13 PagingUE-Identity，
EDTindication-r16 ENUMERATED{true}
…
}
在本实施例的另一中方式以代码的形式示例如下：
PagingRecord-NB-r13：：＝SEQUENCE{
ue-Identity-r13 PagingUE-Identity，
EDTindication-r16 BOOLEN
…
}
实施例11
以下，对本发明的实施例11进行说明，该实施例11给出了一种下行EDT指示信息的设置方式。
在该实施例中，在寻呼消息中除现有的UE标识列表之外，引入一个新的UE标识列表(如pagingrecordlist-r16信息元素)，新的UE标识列表中的UE标识所指示的UE的本次寻呼消息所触发的下行传输使用EDT方式。具体来说，若基站确定一个UE本次下行业务使用下行EDT方式，则基站将寻呼消息中该UE标识包含在新的UE标识列表中；若基站确定一个UE本次下行业务不使用下行EDT方式，则基站将寻呼消息中该UE标识不包含在新的UE标识列表中(即包含在传统pagingrecondlist中)。
在这种实施方式中，所述下行EDT指示信息(如下面的pagingrecordlist-r16信息元素)为在寻呼消息中的新的寻呼UE标识列表。
Paging-NB：：＝SEQUENCE{
    pagingRecordList-r13 PagingRecordList-NB-r13 OPTIONAL，
    pagingRecordList-r16 PagingRecordList-NB-r16 OPTIONAL，
    }
实施例12
以下，对本发明的实施例12进行说明，该实施例12给出了一种下行EDT指示信息的设置方式。
在该实施例中，在寻呼消息中除现有的UE标识列表之外，引入一个下行EDT指示信息，所述下行EDT指示信息可以是用M比特表示的一个整数，该下行EDT指示信息的值对应于UE标识列表中的对应的条目(entry)。举例来说，若该下行EDT指示信息的值设置为N，则表示对UE标识列表(即pagingrecordlist)中前N个(或后N个)UE标识条目所对应的UE的下行传输采用EDT方式。
若基站确定一个UE的本次下行传输采用EDT方式，则基站在寻呼消息中包含所述下行EDT指示信息，其值设置为N，并将该UE对应的UE标识包含在寻呼消息中的UE标识列表中的前N个(或后N个)条目中。若基站确定一个UE的本次下行传输不采用EDT方式，则基站在寻呼消息中不包含所述下行EDT指示信息，或者包含取值设置为N得所述下行EDT指示信息，并将该UE对应的UE标识包含在寻呼消息中的UE标识列表中的后N个(或前N个)条目中。
在这种实施方式中，所述下行EDT指示信息(如下面的EDTindication-r16信息元素)包含在寻呼消息中，为一个整数。
Figure PCTCN2019107801-appb-000003
Figure PCTCN2019107801-appb-000004
实施例13
以下，对本发明的实施例13进行说明。
在上述实施例9中，基站在发送寻呼消息时需要确定对一个UE的本次下行传输是否使用下行EDT方式，如前所述是否使用EDT方式主要基于业务数据大小的判断，可选地，还可以结合UE的增强覆盖等级信息进行判断。该实施例13提供了一种在基站上执行的获取业务数据量大小信息的方法，用于帮助基站确认是否使用下行EDT方式进行下行传输。
步骤1：基站从网络侧实体(如移动性管理实体(Mobility Management Entity，MME))接收针对一个UE的寻呼消息。该寻呼消息中携带本次寻呼所关联的下行传输的下行业务量大小信息。可选地，该寻呼消息中还携带有UE的增强覆盖等级信息。
所述下行业务量大小信息可以是具体的包大小数值，比如X比特或X字节；也可以是一个整数，用于表示大概的数据量大小，比如1标识数据量为1～200比特；2表示数据量为200～400个比特，以此类推。
更进一步地，MME上所述下行业务量大小信息可以是MME从网关实体(如Serving Gateway)获取的，即通过S11接口的下行数据通知消息中包含的下行业务量大小信息来获取。
步骤2：基站基于获取的下行业务量大小信息，可选地，还可以基于获取的UE增强覆盖等级信息，确定UE的本次寻呼对应的下行传输是否使用EDT方式。优选地，如果确定结果为是，基站在空口的寻呼消息中包含下行EDT指示信息，如果否，基站不在空口的寻呼消息中包含下行EDT指示信息。
实施例14
本实施例提出一种下行EDT指示方式，在UE上执行。与前述实施例不同的是，所述下行EDT指示信息包含在下行控制信息(Downlink Control Information，DCI)中在物理下行控制信道(Physical Downlink Control Channel，PDCCH)上传输。该实施例用于UE在接收消息4之前尚未获取任何基站是否在本次移动终止的下行传输中是否使用下行EDT方式的信息， 所以通过用于调度消息4的PDCCH来获取所述下行EDT指示信息。
步骤1：UE接收用于调度消息4下行传输的PDCCH信令。可选地，所述PDCCH信令中包含下行EDT指示信息。所述下行EDT指示信息如前所述，用于指示步骤2中的消息4中包含下行EDT数据。
步骤1之前还包括UE发起随机接入过程，并执行随机接入过程的前三条消息的传输，包括发送随机接入前导、接收RAR和发送消息3。
步骤2：UE接收包含消息4的物理下行共享信道(Physical Downlink Shared CHannel)传输。
步骤3：若UE基于消息4中的竞争解决标识MAC控制元素判断本次随机接入竞争解决成功，且若步骤1中收到的PDCCH信息中包含下行EDT指示信息，则UE将所述下行EDT指示信息告知上层，所述上层至少是RRC层，备选地，还可以是MAC层。
步骤4：RRC层收到来自下层的下行EDT指示信息，则RRC层执行下行EDT的准备工作，并在所述准备工作结束后对步骤2中所述消息4执行L2处理。所述下行EDT的准备工作参见实施例1，此处不赘述。
实施例15
本实施例提出了一种放弃EDT操作的方法，在UE上执行。
在本实施例中，当UE收到底层发来的(上行)EDT取消的指示，若底层指示的此次回退(即EDT取消)是响应于用于(上行)EDT的RRC连接恢复请求的且所述回退不是由于RAR中所提供的上行许可不是用于EDT的，且若UE不准备(not expect)接收下行EDT，则UE执行用户面EDT的放弃操作，所述EDT的放弃操作请参见3GPP协议规范文档36.331的5.3.3.9a章节。
所述UE不准备接收下行EDT，在一种实现方式中，可表述为UE所接收到的寻呼消息中不包含下行EDT指示，或UE未接收到下行EDT指示。
运行在根据本公开的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本公开的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。
用于实现本公开各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执行这些程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本公开的一个或多个实施例也可以使用这些新的集成电路技术来实现。
此外，本公开并不局限于上述实施例。尽管已经描述了所述实施例的各种示例，但本公开并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备，如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上，已经参考附图对本公开的实施例进行了详细描述。但是，具体的结构并不局限于上述实施例，本公开也包括不偏离本公开主旨的任何设计改动。另外，可以在权利要求的范围内对本公开进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本公开的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。

Claims (10)

  1. 一种用户设备UE执行的方法，包括：
    所述UE从基站接收寻呼消息；和
    所述UE在基于所述寻呼消息发起RRC连接建立过程或RRC连接恢复过程时，基于包含在所述寻呼消息中的下行早期数据传输EDT指示信息来判断是否执行下行EDT准备操作。
  2. 根据权利要求1所述的方法，其中，
    在所述下行EDT指示信息存在时，执行所述下行EDT准备操作，在所述下行EDT指示信息不存在时，不执行所述下行EDT准备操作；
    或者，
    在所述下行EDT指示信息的值为1或TURE时，执行所述下行EDT准备操作，在所述下行EDT指示信息的值为0或FALSE时，不执行所述下行EDT准备操作。
  3. 根据权利要求1所述的方法，其中，
    所述下行EDT指示信息为所述寻呼消息中包含的下行EDT UE标识列表，
    在所述UE的UE标识包含在所述下行EDT UE标识列表时，所述UE执行所述下行EDT准备操作。
  4. 根据权利要求1所述的方法，其中，
    所述下行EDT指示信息是用M比特表示的一个整数，且对应于所述寻呼消息中包含的UE标识列表中的对应的条目。
  5. 根据权利要求1所述的方法，其中，
    所述下行EDT准备操作包含以下操作的至少一种操作：
    恢复DRB和/或SRB对应的PDCP状态；
    重建DRB和/或SRB的PDCP实体；
    若最近之前的RRC连接释放消息中提供了drb-continueROHC指示，且所述UE在同一个小区内恢复或建立RRC连接，则指示下层使用所保存的UE接入层上下行且配置了drb-continueROHC，对配置了头压缩协议的DRB继续头压缩协议上下文，若最近之前的RRC连接释放消息中未提供drb-continueROHC指示，或者UE在不同小区内恢复或建立RRC连接，则 指示下层使用所保存的UE接入层上下文，对配置了头压缩协议的DRB重置其头压缩协议上下文；
    恢复DRB和/或SRB；
    使用所保存的NCC的值，并基于当前密钥K eNB所关联的K ASME密钥派生出K eNB密钥；
    派生出先前配置的完整性算法所关联的KRRCint密钥；
    派生出先前配置的加密算法所关联KRRCenc密钥和KUPenc密钥；
    配置下层使用先前配置的完整性算法和派生出来的KRRCint密钥对后续所述UE接收和发送的消息恢复完整性保护；
    配置下层使用先前配置的加密算法和派生出来的KRRCenc密钥对后续所述UE接收和发送的消息恢复加密/解密；
    配置下层使用先前配置的加密算法和派生出来的KUPenc密钥立即对所述UE所发送或接收的用户数据恢复加密/解密；
    恢复安全；和
    配置下层使用EDT。
  6. 一种用户设备UE，包括：
    处理器；以及
    存储器，存储有指令；
    其中，所述指令在由所述处理器运行时执行根据权利要求1至5中任一项所述的方法。
  7. 一种基站执行的方法，包括：
    所述基站接收来自移动控制实体MME对于一个UE的寻呼消息；
    所述寻呼消息包含用于指示本次寻呼所关联的第一下行数据量大小信息；
    根据所述指示信息，确定是否采用下行早期数据传输EDT执行下行数据传输；
    向用户设备UE发送寻呼消息；和
    通过下行早期数据传输EDT指示信息，向所述UE指示在基于所述寻呼消息发起RRC连接建立过程或RRC连接恢复过程时是否执行下行EDT准备操作。
  8. 一种基站，包括：
    处理器；以及
    存储器，存储有指令；
    其中，所述指令在由所述处理器运行时执行根据权利要求7所述的方法。
  9. 一种移动控制实体MME执行的方法，包括：
    所述MME接收来自服务网管的下行数据通知消息，所述消息包含第二下行数据量大小信息；和
    向基站发送对于一个UE的寻呼消息；
    所述寻呼消息包含用于指示本次寻呼所关联的第一下行数据量大小信息；
    所述第一下行数据量大小信息基于所述第二下行数据量大小信息来确定。
  10. 一种移动控制实体，包括：
    处理器；以及
    存储器，存储有指令；
    其中，所述指令在由所述处理器运行时执行根据权利要求9所述的方法。
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