WO2020024880A1 - 由用户设备执行的方法以及用户设备 - Google Patents

由用户设备执行的方法以及用户设备 Download PDF

Info

Publication number
WO2020024880A1
WO2020024880A1 PCT/CN2019/097917 CN2019097917W WO2020024880A1 WO 2020024880 A1 WO2020024880 A1 WO 2020024880A1 CN 2019097917 W CN2019097917 W CN 2019097917W WO 2020024880 A1 WO2020024880 A1 WO 2020024880A1
Authority
WO
WIPO (PCT)
Prior art keywords
information
handover
mcs
user equipment
rnti
Prior art date
Application number
PCT/CN2019/097917
Other languages
English (en)
French (fr)
Inventor
常宁娟
刘仁茂
Original Assignee
夏普株式会社
常宁娟
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 夏普株式会社, 常宁娟 filed Critical 夏普株式会社
Publication of WO2020024880A1 publication Critical patent/WO2020024880A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link

Definitions

  • the present invention relates to the field of wireless communication technologies, and more particularly, the present invention relates to a method performed by a user equipment and a corresponding user equipment.
  • the RACH-less handover solution in the NR system will be researched based on the RACH-less handover solution in the Long Term Evolution (LTE) system.
  • the present invention proposes a solution to some problems of implementing RACH-less handover technology in an NR system.
  • the present invention can provide a method performed by a user equipment and a user equipment, which can implement a random access-free handover in an LTE / NR system, thereby reducing handover interruption time.
  • the present invention proposes a method performed by user equipment, including: receiving a handover command containing no random access handover information for no random access handover; and according to the received handover command
  • the wireless network temporary identification RNTI information and the modulation and coding scheme MCS indication included in the random access-free handover information included in the information are selected, and the MCS scheme used for physical uplink shared channel PUSCH transmission is selected.
  • the random access-free handover information includes at least target time advance configuration information and uplink configuration information
  • the uplink configuration information includes at least the RNTI information and the MCS indication.
  • a method performed by a user equipment including: receiving a handover command containing no random access handover information for no random access handover; and according to the received handover command, The MCS table indication information and MCS indication in the included random access handover information are selected, and the MCS scheme used for PUSCH transmission is selected.
  • the random access-free handover information includes at least target time advance configuration information and uplink configuration information
  • the uplink configuration information includes at least the MCS table indication information and the MCS indication.
  • a method performed by a user equipment including: receiving a physical downlink control channel PDCCH and a physical downlink shared channel PDSCH sent by a target base station as a handover destination; if the user equipment is configured with no Random access handover information, the medium access control MAC layer of the user equipment indicates to the radio resource control RRC layer a successful reception of a PDCCH transmission addressed by a modulation coding scheme-cell wireless network temporary identifier, that is, MCS-C-RNTI; And, if the MAC layer indicates successful reception of the PDCCH transmission addressed by the MCS-C-RNTI, and the user equipment is configured with the no-random access handover information, the user equipment The RRC layer considers that no random access handover is successful.
  • the MAC layer of the medium access control is configured with the no random access handover information and a user equipment contention resolution identification MAC control element is received on the received PDSCH, and the received The PDSCH is indicated by a PDCCH addressed by the MCS-C-RNTI of a special cell, and then the RRC layer of the user equipment is indicated by the PDCCH addressed by the MCS-C-RNTI. Successful reception of transmission.
  • a method performed by a user equipment including: receiving a physical downlink control channel PDCCH and a physical downlink shared channel PDSCH sent by a target base station as a handover destination; if the user equipment is configured with no Random access handover information, the medium access control MAC layer of the user equipment indicates to the radio resource control RRC layer a successful reception of the PDCCH transmission addressed by the semi-static channel state information-the wireless network temporary identifier, that is, SP-CSI-RNTI And, if the MAC layer indicates successful reception of the PDCCH transmission addressed by the SP-CSI-RNTI, and the user equipment is configured with the no-random access handover information, the user The RRC layer of the device considers that no random access handover is successful.
  • the MAC layer of the medium access control is configured with the no random access handover information and a user equipment contention resolution identification MAC control element is received on the received PDSCH, and the received The PDSCH is indicated by a PDCCH addressed by the SP-CSI-RNTI of a special cell, and then the RRC layer of the user equipment is instructed to the PDCCH addressed by the SP-CSI-RNTI. Successful reception of transmission.
  • the handover command is a radio resource control RRC reconfiguration message including a synchronous reconfiguration information element or a mobile control information information element.
  • a user equipment including: a processor; and a memory storing instructions, wherein the instructions execute the above method of the present invention when run by the processor.
  • the present invention proposes a specific solution for how to determine the physical uplink shared channel (PUSCH) transmission in the RACH-less handover process in the LTE / NR system. time.
  • PUSCH physical uplink shared channel
  • FIG. 1 is a schematic timing diagram showing a general handover procedure in an LTE / NR system.
  • FIG. 2 is a diagram showing MCS table 1 for PUSCH transmission supported by the NR system.
  • FIG. 3 is a diagram showing MCS table 2 for PUSCH transmission supported by the NR system.
  • FIG. 4 is a diagram showing MCS table 3 for PUSCH transmission supported by the NR system.
  • FIG. 5 is a flowchart illustrating a method performed by a user equipment according to Embodiment 1 of the present invention.
  • FIG. 6 is a flowchart illustrating a method performed by a user equipment according to Embodiment 2 of the present invention.
  • FIG. 7 is a flowchart illustrating a method performed by a user equipment according to Embodiment 3 of the present invention.
  • FIG. 8 is a flowchart illustrating a method performed by a user equipment according to Embodiment 4 of the present invention.
  • FIG. 9 is a block diagram showing a user equipment UE according to an embodiment of the present invention.
  • LTE can be replaced by Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) or Evolved Universal Terrestrial Radio Access (Evolved Universal Terrestrial Radio Access, E-UTRA). Timing (advance), timing adjustment (timing adjustment) and time alignment (time alignment) can be replaced.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • Timing advanced timing adjustment
  • time alignment time alignment
  • a serving base station of the UE also referred to as a source base station during handover triggers radio resource management (Radio Resource Management) measurement of the UE by sending a measurement configuration to the UE.
  • radio resource management Radio Resource Management
  • the UE sends a measurement report to the network side.
  • the base station receiving the measurement report evaluates the measurement results in the measurement report, if it considers that a handover is needed, it selects the target base station to initiate the handover preparation process.
  • the target base station After the handover preparation process is completed, the target base station generates and sends an RRC reconfiguration message including synchronous reconfiguration (Reconfiguration with sync) or mobility control information (MobilityControlInformation) to the UE through the source base station.
  • RRC reconfiguration message including synchronous reconfiguration (Reconfiguration with sync) or mobility control information (MobilityControlInformation)
  • the UE After receiving the RRC reconfiguration message, the UE starts performing handover, and first performs downlink synchronization to the target base station, and then completes uplink synchronization with the target base station through a random access process and successfully accesses the target base station. The UE considers that the handover process is successfully completed.
  • the above-mentioned RRC reconfiguration message containing a synchronous reconfiguration (Reconfigurationwithsync) information element or a mobility control information (MobilityControlInfo) information element is collectively referred to as a handover command, which is used to trigger the UE for network-side control mobility .
  • the synchronous reconfiguration information element or the mobile control information information element includes configuration information of the target base station, and is used to configure mobility information, such as configuration information of the target base station, to the UE in network-controlled mobility.
  • the handover generally refers to network layer or UE controlled handover, cell change, intra-cell handover for security update, etc. in the RRC connection state.
  • intra-site (intra-site or intra-nodeB) handover the source base station and the target base station are the same base station.
  • the UE first sends a random access preamble to the base station, and the base station receiving the random access preamble determines the uplink timing advance of the UE and the message for message 3 according to the received random access preamble.
  • Scheduling information includes the uplink timing advance and the scheduling information used for message 3 (that is, the first uplink transmission except the random access preamble in the random access process) in the Random Access Response (Random Access Response, RAR) ) Message to the UE.
  • RAR Random Access Response
  • the random access process in the handover process is mainly used by the UE to obtain an uplink timing advance to achieve uplink synchronization with the target base station and to obtain scheduling information for message 3 transmission.
  • the random access process in the handover process must be performed.
  • the RACH-less handover introduced in the LTE mobility enhancement study in Release 14 is designed to avoid execution during the handover process.
  • the handover delay caused by the random access process reduces the handover time and service interruption time.
  • the main scenario of RACH-less handover in version 14 is intra-eNB handover (intra-eNB or intra-site) or the uplink timing advance of the target base station by the UE is already known (such as a micro base station or target where the uplink timing advance is always zero).
  • a cell is a serving cell in carrier aggregation scenarios. Because the uplink timing advance in these scenarios is predictable, the random access process is not necessary in the handover process in these scenarios.
  • the network side informs this information by including the rach-skip information element in the handover command.
  • the rach-skip information element includes two parts, the first part is uplink timing advance information, and the second part is scheduling information for message 3; the latter is optional, that is, the network side may not be configured in the handover command.
  • the UE needs to obtain the scheduling information for message 3 by monitoring the physical downlink control channel (Phycisal Downlink Control Channel, PDCCH) channel of the target base station.
  • PDCCH Physical Downlink Control Channel
  • the scheduling information includes the number of uplink hybrid automatic retransmission processes, the uplink scheduling interval, the uplink start subframe, and the uplink grant (UL grant).
  • the uplink grant is 16 bits, including frequency hopping instructions, resource block allocation, truncated MCS configuration, and channel quality indicator (CQI) request bits.
  • the UE understands the truncated MCS configuration in the uplink grant as the same processing method as the MCS configuration in the RAR in the general random access process, and also selects the MCS according to the MCS configuration in the RAR to follow the truncated MCS in the uplink grant. Configured to select MCS for PUSCH transmission during RACH-less handover.
  • the UE After the UE completes downlink synchronization with the target base station, if the UE receives a PDCCH scrambled with C-RNTI from the target base station, the UE considers the handover successful.
  • the NR system is different from the LTE system and introduces some new mechanisms.
  • the UE in NR, the UE must determine the modulation and coding scheme (Modulation and Coding Scheme, MCS) used by the PUSCH each time it transmits a PUSCH.
  • MCS Modulation and Coding Scheme
  • the current NR system supports three different MCS tables for PUSCH transmission (see 3GPP Technical Specification Document TS38.214, which is excerpted as MCS tables 1 to 3 in the present invention, corresponding to Table 5.1.3.1 in TS38.214 -1 to 3, as shown in Figures 2 to 4).
  • the UE selects a modulation order and a target code rate from the corresponding table based on the MCS index (MCS index, denoted as I MCS ) in the PUSCH scheduling information and the selected corresponding MCS table.
  • MCS index MCS index
  • I MCS MCS index
  • a new UE wireless network is introduced in NR
  • the temporary identification is called MCS-C-RNTI in the present invention.
  • the RNTI is used to instruct the UE to use 64 Quadrature Amplitude Modulation (QAM) modulation and coding during transmission based on uplink grant scheduling.
  • QAM Quadrature Amplitude Modulation
  • the UE selects the MCS table according to the RNTI scrambled by the PDCCH.
  • the following embodiments of the present invention mainly propose an implementation method for RACH-less handover based on the above mechanism introduced in NR.
  • FIG. 5 is a flowchart illustrating a method performed by a user equipment according to Embodiment 1 of the present invention.
  • This embodiment 1 proposes an MCS selection method based on the indicated RNTI (or RNTI type) and the MCS indication in the RACH-less handover process.
  • the UE can determine the RACH-less The modulation order and target code rate used for transmitting the PUSCH to the target base station during the handover.
  • the UE receives a handover command including RACH-less handover information for RACH-less handover.
  • the RACH-less handover information such as the RACH-less handover mechanism in LTE, may be included in a rach-skip information element (in the scenario of SN / SCG change, it may also be a rach-skipSN information element or a rach-skipSCG information element), Information used to instruct the UE to perform RACH-less handover and perform RACH-less handover.
  • the RACH-less handover information includes target time advance configuration, which is used to indicate a target Primary Timing Advance Group (PTAG) when the UE is handed over or a Primary Secondary Timing Advance Group when the secondary cell group is changed.
  • PTAG Primary Timing Advance Group
  • the RACH-less handover information includes uplink configuration information (can be recorded as an ul-configInfo information element), which is used to indicate scheduling information required by the UE for PUSCH transmission at the target base station.
  • the uplink configuration information includes an MCS indication (referred to as I MCS or identified by an mcsandTBS information element) and RNTI information.
  • the RNTI information is used to instruct the UE through which RNTI the PUSCH is scheduled. For example, if the RNTI information is set to C-RNTI (cell-RNTI), the UE considers that the PUSCH is scheduled through the C-RNTI.
  • the UE considers that the PUSCH is scheduled by MCS-C-RNTI; if the RNTI information is set to SP-CSI-RNTI (Semi Persistent-Channel State Information-RNTI) ), The UE considers that the PUSCH is scheduled through SP-CSI-RNTI; if the RNTI information is set to RA-RNTI (Random Access-RNTI), the UE considers that the PUSCH is scheduled through RA-RNTI, and so on. Alternatively, if the RNTI information is not included in the uplink configuration information, the UE considers that the PUSCH is scheduled through C-RNTI.
  • SP-CSI-RNTI Semi Persistent-Channel State Information-RNTI
  • the UE considers that the PUSCH is scheduled through C-RNTI, and if the RNTI information is set to "0" or "False", the UE The PUSCH is considered to be scheduled by MCS-C-RNTI; on the contrary, it can also be implemented that if the RNTI information is set to "1" or "True”, the UE considers that the PUSCH is scheduled by MCS-C-RNTI If the RNTI information is set to "0" or "false", the UE considers that the PUSCH is scheduled through C-RNTI.
  • the RNTI information is included in an uplink grant information element in the uplink configuration information.
  • the UE selects an MCS for PUSCH transmission according to the RNTI information and the MCS instruction received in step 501, that is, selects a modulation order and a target code rate for PUSCH transmission. Specifically, the UE selects the MCS sent by the PUSCH according to the following principles in combination with the RNTI information and the MCS indication:
  • the UE uses the MCS indicator and MCS table 2 to determine the modulation order and target code rate used for PUSCH transmission; otherwise, if the UE is not configured with MCS-C- RNTI, the mcs-table information element in the PUSCH configuration information element is set to QAM64lowSE and the PUSCH is scheduled using C-RNTI or SP-CS-RNTI and the PUSCH is allocated using the PDCCH in the UE-specific search space, then the UE uses MCS Indication and MCS table 3 to determine the modulation order and target code rate used for PUSCH transmission; otherwise, if the UE is configured with MCS-C-RNTI and the PUSCH is scheduled using MCS
  • DCI Downlink Control Information
  • the PUSCH transmission is not disabled for conversion precoding.
  • the UE uses the MCS indication and MCS table 2 to determine the modulation order and target code rate used for PUSCH transmission; otherwise, if the UE is not configured with MCS-C-RNTI, the mcs in the PUSCH configuration information element -tabletransformprecoder information element is set to QAM64lowSE and PUSCH is scheduled using C-RNTI or SP-CS-RNTI and PUSCH is allocated using PDCCH in UE specific search space, then the UE uses MCS indication and MCS table 3 to determine PUSCH transmission The modulation order and target code rate used; otherwise, if the UE is configured with MCS-C-RNTI and the PUSCH is scheduled using MCS-
  • the C-RNTI is a temporary identifier of the UE in the serving cell
  • the SP-CSI-RNTI is the UE identifier allocated for reporting the semi-static channel state indication information on the PUSCH.
  • RA-RNTI refers to the RNTI used to receive RAR.
  • the QAM64lowSE can also be written as QAM64 or 64QAM.
  • the PUSCH configuration information element (PUSCH-config) is used to configure UE-specific PUSCH parameters applied to a specific bandwidth part (BWP), which may include PUSCH data scrambling identification, demodulation reference signal configuration, and frequency hopping configuration , Codebook configuration, etc.
  • BWP bandwidth part
  • the PTAG refers to a TAG including a primary cell (Primary Cell) in a primary cell group (PCG) or a master base node (MN) in a dual connectivity (DC) configuration scenario.
  • the PSTAG refers to a TAG containing a primary and secondary cell (Secondary Cell) in a secondary cell group (SCG) or a secondary base station (SN) in a dual connectivity (DC) configuration scenario.
  • the DC may include any combination of MN being LTE or NR and SN being LTE or NR, such as EN-DC with MN being LTE and SN being NR.
  • the PUSCH refers to a PUSCH sent using an uplink grant included in a handover command in a RACH-less handover, and may be referred to as a preconfigured uplink grant.
  • the UE sends a handover response (RRC reconfiguration completion message) to the target base station on the PUSCH.
  • FIG. 6 is a flowchart illustrating a method performed by a user equipment according to Embodiment 2 of the present invention.
  • This embodiment 2 proposes a MCS selection method based on an MCS table indication and an MCS indication in a RACH-less handover process.
  • the UE can determine that the RACH-less handover is used to send the MCS associated with the PUSCH to the target base station.
  • the UE receives a handover command including RACH-less handover information for RACH-less handover.
  • the RACH-less handover information such as the RACH-less handover mechanism in LTE, may be included in a rach-skip information element (in the scenario of SN / SCG change, it may also be a rach-skipSN information element or a rach-skipSCG information element), Information used to instruct the UE to perform RACH-less handover and perform RACH-less handover.
  • the RACH-less handover information includes target time advance configuration, which is used to indicate a target Primary Timing Advance Group (PTAG) when the UE is handed over or a Primary Secondary Timing Advance Group when the secondary cell group is changed.
  • PTAG Primary Timing Advance Group
  • the RACH-less handover information includes uplink configuration information (can be recorded as ul-configInfo), which is used to indicate scheduling information required by the UE for PUSCH transmission at the target base station.
  • the uplink configuration information includes MCS indication (referred to as I MCS or identified by the mcsandTBS information element) and MCS table indication information.
  • MCS table indication information may be set to QAM256 or QAM64lowSE, and is used to instruct the UE to use the MCS table used when the PUSCH without transform precoding is sent.
  • the MCS table indication information may be set to QAM256 or QAM64lowSE, and is used to indicate the MCS table used when the UE sends a PUSCH with transform precoding (PUSCH with transform precoding).
  • the MCS table indication information is not included in the uplink configuration information, the UE uses QAM4LowSE.
  • the MCS table indication information is included in an uplink grant information element in the uplink configuration information.
  • step 603 the UE selects an MCS for PUSCH transmission according to the MCS table instruction information and the MCS instruction received in step 601, that is, selects a modulation order and a target code rate for PUSCH transmission.
  • the UE uses the MCS indication included in the RACH-less handover information. And MCS Table 2 to determine the scheduling order and target code rate for PUSCH.
  • the MCS table indication information in the RACH-less handover information is set to QAM256, if the MCS table indication information in the RACH-less handover information is set to QAM256, the UE uses the MCS indication and MCS table 2 included in the RACH-less handover information to determine a scheduling order and a target code rate for the PUSCH.
  • the UE uses the MCS included in the RACH-less handover information Indication and MCS Table 3 to determine the scheduling order and target code rate for PUSCH.
  • the MCS table indication information in the RACH-less handover information is set to QAM64lowSE.
  • the UE uses the MCS indication and MCS table 3 included in the RACH-less handover information to determine a scheduling order and a target code rate for the PUSCH.
  • the QAM64lowSE can also be written as QAM64 or 64QAM.
  • the PTAG refers to a TAG including a primary cell (Primary Cell) in a primary cell group (PCG) or a master base node (MN) in a dual connectivity (DC) configuration scenario.
  • the PSTAG refers to a TAG containing a primary and secondary cell (Secondary Cell) in a secondary cell group (SCG) or a secondary base station (SN) in a dual connectivity (DC) configuration scenario.
  • the DC may include any combination of MN being LTE or NR and SN being LTE or NR, such as EN-DC with MN being LTE and SN being NR.
  • the PUSCH refers to a PUSCH sent using an uplink grant included in a handover command in a RACH-less handover, and may be referred to as a preconfigured uplink grant.
  • the UE sends a handover response (RRC reconfiguration completion message) to the target base station on the PUSCH.
  • FIG. 7 is a flowchart illustrating a method performed by a user equipment according to Embodiment 3 of the present invention.
  • This Embodiment 3 proposes a method for judging the handover success in the RACH-less handover process, which is performed on the UE side.
  • the UE receives a PDCCH and a physical downlink shared channel (PDSCH) sent by a target base station as a handover destination.
  • PDSCH physical downlink shared channel
  • the UE receiving the PDSCH is optional.
  • step 703 if the UE is configured with rach-skip or rach-skipSCG or rach-skipSN, that is, the UE is configured with RACH-less handover information, the medium access control (MAC) layer of the UE reports to the RRC.
  • the layer indicates successful reception of a PDCCH transmission addressed with MCS-C-RNTI.
  • step 705 if the MAC layer indicates successful reception of PDCCH transmission addressed by MCS-C-RNTI, and the UE is configured with RACH-less handover information, the UE RRC layer considers the RACH-less handover successful. At this time, the UE performs the following operations:
  • Operation 1 Stop the handover detection timer T304;
  • Operation 2 Release the RACH-less handover configuration, that is, release the configuration of the rach-skip or rach-skipSN or rach-skipSCG information element.
  • the rach-skip information element is used for the RACH-less handover configuration in the handover of MCG / MN
  • the rach-skipSN or rach-skipSCG information element is used for the SCG / SN change (or reconfiguration with sync).
  • RACH-less configuration that is, release the configuration of the rach-skip or rach-skipSN or rach-skipSCG information element.
  • the UE is configured with a RACH-less handover, and may also be described as a UE configured with a rach-skip information element or a rach-skipSN or a rach-skipSCG information element.
  • step 703 if the MAC entity is configured with rach-skip or rach-skipSCG or rach-skipSN and a received UE competition resolution identifier MAC control element is received on the received PDSCH, and the received The PDSCH is indicated by the PDCCH addressed by the MCS-C-RNTI in a special cell (special cell, SpCell), and then the RRC layer is instructed to successfully receive a PDCCH transmission addressed by the MCS-C-RNTI.
  • the SpCell refers to the primary cell of the MCG or the primary and secondary cell of the SCG in the DC configuration. Otherwise, in the scenario where no DC is configured, it refers to the primary cell PCell.
  • One SpCell supports a physical uplink control channel (Physical Uplink Control Channel (PUCCH) transmission and contention-based random access are always active.
  • PUCCH Physical Uplink Control Channel
  • FIG. 8 is a flowchart illustrating a method performed by a user equipment according to Embodiment 4 of the present invention.
  • This Embodiment 4 proposes a method for judging the handover success in the RACH-less handover process, which is performed on the UE side.
  • step 801 the UE receives a PDCCH and a physical downlink shared channel (PDSCH) sent by a target base station as a handover destination.
  • PDSCH physical downlink shared channel
  • the UE receiving the PDSCH is optional.
  • step 803 if the UE is configured with rach-skip or rach-skipSCG or rach-skipSN, that is, the UE is configured with RACH-less handover information, the Medium Access Control (MAC) layer of the UE reports to the RRC.
  • the layer indicates successful reception of a PDCCH transmission addressed with SP-CSI-RNTI.
  • step 805 if the MAC layer indicates successful reception of the PDCCH transmission addressed by SP-CSI-RNTI and the UE is configured with RACH-less handover, the UE RRC layer considers the RACH-less handover successful. At this time, the UE performs the following operations:
  • Operation 1 Stop the handover detection timer T304;
  • Operation 2 Release the RACHless handover configuration, that is, release the configuration of the rach-skip or rach-skipSN or rach-skipSCG information element.
  • the rach-skip information element is used for the RACH-less handover configuration in the handover of MCG / MN
  • the rach-skipSN or rach-skipSCG information element is used for the SCG / SN change (or reconfiguration with sync).
  • RACH-less configuration that is, release the configuration of the rach-skip or rach-skipSN or rach-skipSCG information element.
  • the UE is configured with a RACH-less handover, and may also be described as a UE configured with a rach-skip information element or a rach-skipSN or a rach-skipSCG information element.
  • step 803 if the MAC entity is configured with rach-skip or rach-skipSCG or rach-skipSN and a received UE contention resolution MAC control element is received on the received PDSCH, and the received The PDSCH is indicated by the SP-CSI-RNTI-addressed PDCCH of a special cell (special cell, SpCell), and then the RRC layer is instructed to successfully receive a PDCCH transmission addressed by the SP-CSI-RNTI.
  • the SpCell refers to the primary cell of the MCG or the primary and secondary cell of the SCG in the DC configuration. Otherwise, in the scenario where no DC is configured, it refers to the primary cell PCell.
  • One SpCell supports a physical uplink control channel (Physical Uplink Control Channel (PUCCH) transmission and contention-based random access are always active.
  • PUCCH Physical Uplink Control Channel
  • base station refers to mobile communication data and control switching centers with large transmission power and wide coverage area, including functions such as resource allocation scheduling, data receiving and sending.
  • User equipment refers to a user's mobile terminal, such as a terminal device that can communicate wirelessly with a base station or a micro base station, such as a mobile phone or a notebook.
  • the method and related equipment of the present invention have been described above in connection with the preferred embodiments. Those skilled in the art can understand that the method shown above is only exemplary. The method of the invention is not limited to the steps and sequence shown above.
  • the base station and user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future and can be used for the base station, MME, or UE, and so on.
  • the various identifiers shown above are merely exemplary and not restrictive, and the present invention is not limited to specific cells as examples of these identifiers. Those skilled in the art can make many variations and modifications based on the teachings of the illustrated embodiments.
  • FIG. 9 is a block diagram showing a user equipment UE according to an embodiment of the present invention.
  • the user equipment UE90 includes a processor 901 and a memory 902.
  • the processor 901 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 902 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 memories.
  • the memory 902 stores program instructions. When the instruction is executed by the processor 901, the above-mentioned method performed by the user equipment, which is described in detail in the present disclosure, may be performed.
  • the program running on the device according to the present invention may be a program that causes a computer to realize the functions of the embodiments of the present invention 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 invention 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 invention may also be implemented using these new integrated circuit technologies.
  • the present invention is not limited to the embodiments described above. Although various examples of the embodiments have been described, the present invention 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.

Landscapes

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

Abstract

本发明提供了一种由用户设备执行的方法，包括：接收用于无随机接入切换的包含无随机接入切换信息的切换命令；以及根据所接收到的所述切换命令中所包含的所述无随机接入切换信息中的无线网络临时标识RNTI信息和调制编码方案MCS指示，选择用于物理上行共享信道PUSCH发送的MCS方案。

Description

由用户设备执行的方法以及用户设备 技术领域
本发明涉及无线通信技术领域，更具体地，本发明涉及由用户设备执行的方法以及相应的用户设备。
背景技术
2018年6月，在第三代合作伙伴计划(3rd Generation Partnership Project：3GPP)RAN#80次全会上批准了一个5G技术标准的新的研究项目(参见非专利文献：RP-181433：New WID on NR(New Radio)mobility enhancements)。该项目的研究目的之一是找到用于满足NR中的移动性需求之一：无缝切换，即在小区切换过程中能够满足0毫秒的切换中断时间。在正在研究的降低切换中断时间的解决方案中，有一种解决方法称为无随机接入切换((Random Access Channel，RACH)-less handover)，即在切换过程中在接入目标基站时可以不需要执行随机接入过程，以降低整个切换过程的时延，从而减少因切换而带来的业务中断时间。
NR系统中的RACH-less切换解决方案将基于长期研究(Long Term Evolution，LTE)系统中的RACH-less切换方案进行研究。本发明针对在NR系统中实现RACH-less切换技术的一些问题提出解决方法。
发明内容
为了解决现有技术的上述问题中的至少一些，提出了本发明。本发明可以提供一种由用户设备执行的方法以及用户设备，能够在LTE/NR系统中实现无随机接入切换，从而降低切换中断时间。
为了实现上述目的，本发明提出了一种由用户设备执行的方法，包括：接收用于无随机接入切换的包含无随机接入切换信息的切换命令；以及根据所接收到的所述切换命令中所包含的所述无随机接入切换信息中的无线网络临时标识RNTI信息和调制编码方案MCS指示，选择用于物理上行共享信道PUSCH发送的MCS方案。
优选地，所述无随机接入切换信息至少包含：目标时间提前配置信息和上行配置信息，所述上行配置信息至少包含所述RNTI信息和所述MCS指示。
此外，根据本发明，提出了一种由用户设备执行的方法，包括：接收用于无随机接入切换的包含无随机接入切换信息的切换命令；以及根据所接收到的所述切换命令中所包含的所述无随机接入切换信息中的调制编码方案MCS表格指示信息和MCS指示，选择用于PUSCH发送的MCS方案。
优选地，所述无随机接入切换信息至少包含：目标时间提前配置信息和上行配置信息，所述上行配置信息至少包含所述MCS表格指示信息和所述MCS指示。
另外，根据本发明，提出了一种由用户设备执行的方法，包括：接收作为切换目的地的目标基站发送的物理下行控制信道PDCCH和物理下行共享信道PDSCH；若所述用户设备被配置了无随机接入切换信息，则所述用户设备的媒介接入控制MAC层向无线资源控制RRC层指示以调制编码方案-小区无线网络临时标识即MCS-C-RNTI寻址的PDCCH传输的成功接收；以及，若所述MAC层指示了以所述MCS-C-RNTI寻址的所述PDCCH传输的成功接收，且所述用户设备被配置了所述无随机接入切换信息，则所述用户设备的所述RRC层认为无随机接入切换成功。
优选地，若所述媒介接入控制MAC层被配置了所述无随机接入切换信息且在所接收到的所述PDSCH上收到了用户设备竞争解决标识MAC控制元素，并且所述接收到的所述PDSCH是由特殊小区的由所述MCS-C-RNTI寻址的PDCCH所指示的，则向所述用户设备的所 述RRC层指示以所述MCS-C-RNTI寻址的所述PDCCH传输的成功接收。
此外，根据本发明，提出了一种由用户设备执行的方法，包括：接收作为切换目的地的目标基站发送的物理下行控制信道PDCCH和物理下行共享信道PDSCH；若所述用户设备被配置了无随机接入切换信息，则所述用户设备的媒介接入控制MAC层向无线资源控制RRC层指示以半静态信道状态信息-无线网络临时标识即SP-CSI-RNTI寻址的PDCCH传输的成功接收；以及，若所述MAC层指示了以所述SP-CSI-RNTI寻址的所述PDCCH传输的成功接收，且所述用户设备被配置了所述无随机接入切换信息，则所述用户设备的所述RRC层认为无随机接入切换成功。
优选地，若所述媒介接入控制MAC层被配置了所述无随机接入切换信息且在所接收到的所述PDSCH上收到了用户设备竞争解决标识MAC控制元素，并且所述接收到的所述PDSCH是由特殊小区的由所述SP-CSI-RNTI寻址的PDCCH所指示的，则向所述用户设备的所述RRC层指示以所述SP-CSI-RNTI寻址的所述PDCCH传输的成功接收。
优选地，所述切换命令为包含同步重配置信息元素或移动控制信息信息元素的无线资源控制RRC重配置消息。
另外，根据本发明，提出了一种用户设备，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本发明的上述方法。
本发明针对在LTE/NR系统中如何确定RACH-less切换过程中的物理上行共享信道(PUSCH)传输提出了具体解决方法，能够在LTE/NR系统中实现无随机接入切换，从而降低切换中断时间。
附图说明
通过下文结合附图的详细描述，本发明的上述和其它特征将会变得更加明显，其中：
图1是示出了LTE/NR系统中的一般切换过程的示意时序图。
图2是示出了NR系统支持的用于PUSCH传输的MCS表格1的图。
图3是示出了NR系统支持的用于PUSCH传输的MCS表格2的图。
图4是示出了NR系统支持的用于PUSCH传输的MCS表格3的图。
图5是示出了根据本发明的实施例1的由用户设备执行的方法的流程图。
图6是示出了根据本发明的实施例2的由用户设备执行的方法的流程图。
图7是示出了根据本发明的实施例3的由用户设备执行的方法的流程图。
图8是示出了根据本发明的实施例4的由用户设备执行的方法的流程图。
图9是表示本发明的一个实施例所涉及的用户设备UE的框图。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细阐述。
在本发明中，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，下述用于描述本发明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发明的示例性实施例。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，在不背离本发明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/NR移动通信系统及其后续的演进版本作为示例应用环境，具体描述了根据本发明的多个实施方式。然而，需要指出的是，本发明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。若无特殊说明，在本发明中，小区和基站的概念可以互相替换；LTE系统也用于指代5G及其之后的LTE系统(如称为eLTE系统，或者可以连接到5G核心网的LTE系统)，同时LTE可以用演进的通用陆地无线接入网络(Evolved Universal Terrestrial Radio Access Network，E-UTRAN)或演进的通用陆地无线接入(Evolved Universal Terrestrial Radio Access，E-UTRA)来替换。时间提前(timing advance)、时间调整(timing adjustment)以及时间对齐(time alignment)之间可以替换。
先简要介绍一下LTE/NR系统中的一般切换过程。如图1所示，UE的服务基站(在切换时也称为源基站)通过向UE发送测量配置来触发UE的无线资源管理(Radio Resource Management)测量。当触发了测量上报时，UE向网络侧发送测量报告。收到测量报告的基站对测量报告内的测量结果进行评估后，如果认为需要切换，则选择目标基站发起切换准备过程。在切换准备过程完成后，目标基站生成并通过源基站向UE下发包含同步重配置(Reconfigurationwithsync)或移动控制信息(MobilityControlInformation)的RRC重配置消息。收到该RRC重配置消息的UE开始执行切换，先下行同步到目标基站，再通过随机接入过程完成与目标基站的上行同步并成功接入到目标基站中时，UE认为切换过程成功完成。
值得注意的是，在本发明中，上述包含同步重配置(Reconfigurationwithsync)信息元素或移动控制信息(MobilityControlInfo)信息元素的RRC重配置消息统称为切换命令，用于触发UE进行网络侧控制的移动性。其中，所述同步重配置信息元素或移动控制信息信息元素包含目标基站的配置信息，用于在网络侧控制的移动性中向UE配置 移动性信息如目标基站的配置信息。本发明中切换泛指RRC连接状态下网络层控制或UE控制的切换、小区变更、用于安全更新的小区内切换等。在站内(intra-site或intra-nodeB)切换的场景下，源基站和目标基站是同一个基站。
再介绍一下LTE中的RACH-less切换机制。在随机接入过程中，首先由UE向基站发送随机接入前导(preamble)，收到随机接入前导的基站根据收到的随机接入前导确定该UE的上行时间提前量和用于消息3的调度信息，并将上行时间提前量和用于消息3(即随机接入过程中除随机接入前导外的第一个上行传输)的调度信息包含在随机接入响应(Random Access Response，RAR)消息中发送给UE。简言之，切换过程中的随机接入过程主要用于UE获取上行时间提前量以实现和目标基站的上行同步以及获取用于消息3传输的调度信息。在版本14之前的LTE系统中，切换过程中的随机接入过程是必须执行的，在版本14的LTE移动性增强研究中引入的RACH-less切换，其目的是为了通过在切换过程中避免执行随机接入过程而带来的切换时延，从而缩短切换时间以及业务中断时间。版本14的RACH-less切换的主要场景是站内切换(intra-eNB或intra-site)或者UE对目标基站的上行时间提前量是已经获知的(如上行时间提前量总是零的微基站或目标小区是载波聚合场景下的一个服务小区)，因为在这些场景下的上行时间提前量是可预知的，因此随机接入过程在这些场景下的切换过程中不是必须的。在RACH-less切换中，虽然UE不需要执行随机接入，但仍需获取上行时间提前量和用于消息3的调度信息，网络侧通过在切换命令中包含rach-skip信息元素将这些信息告知UE。所述rach-skip信息元素包含两部分，第一部分是上行时间提前量信息，第二部分是用于消息3的调度信息；后者是可选的，也就是说网络侧可以不在切换命令中配置第二部分，此时UE需要通过监听目标基站的物理下行控制信道(Phycisal Downlink Control Channel，PDCCH)信道来获取用于消息3的调度信息。所述调度信息包含上行混合自动重传进程数、上行调度间隔、上行起始子帧和上行许可(UL grant)等。其中，上行许可为16bit，包含跳频指 示、资源块分配、截断的MCS配置和信道质量指示(Channel Quality Indicator，CQI)请求比特。其中，UE将上行许可中截断的MCS配置理解为和一般随机接入过程中的RAR中的MCS配置相同的处理方式，并也按照RAR中MCS配置选择MCS的方式来按照上行许可中截断的MCS配置来选择用于RACH-less切换过程中的PUSCH传输的MCS。同时在LTE的RACH-Less切换中，UE在和目标基站完成下行同步后，若UE收到来自目标基站的以C-RNTI加扰的PDCCH则UE认为切换成功。
NR系统不同于LTE系统引入一些新的机制，例如NR中UE在每次传输PUSCH时要决定本次PUSCH所使用的调制编码机制(Modulation and Coding Scheme，MCS)。目前的NR系统中支持三个不同的用于PUSCH传输的MCS表格(可参见3GPP技术规范文档TS38.214，本发明中摘录作MCS表格1～3，对应于TS38.214中的表5.1.3.1-1～3，分别如图2-图4所示)。UE基于PUSCH调度信息中的MCS指示(MCS index，记作I MCS)和所选择的对应的MCS表格从所对应的表格中选择调制阶数和目标码率。此外，除了小区无线网络临时标识(Cell-Radio Network Temporary Identifier，C-RNTI)，考虑到超可靠低时延通信(Ultra Reliable Low Latency Communications，URLLC)业务，NR中引入了一个新的UE无线网络临时标识，本发明中称为MCS-C-RNTI，该RNTI用于在基于上行许可(grant)调度的传输时指示UE使用64正交幅度调制(Quadrature Amplitude Modulation，QAM)的调制编码方式。当网络侧为UE配置了该MCS-C-RNTI时，UE根据PDCCH所加扰的RNTI来选择MCS表格。本发明下述实施例主要针对NR中引入的上述机制提出用于RACH-less切换的实现方法。
实施例1
图5是示出了根据本发明的实施例1的由用户设备执行的方法的流程图。
本实施例1提出了一种RACH-less切换过程中的基于所指示的 RNTI(或称RNTI类型)和MCS指示的MCS选择方法，通过该实施例1所述的方法，UE可以确定RACH-less切换中用于向目标基站发送PUSCH所使用的调制阶数和目标码率。
如图1所示，在步骤501，UE接收用于RACH-less切换的包含RACH-less切换信息的切换命令。所述RACH-less切换信息如LTE中RACH-less切换机制可以包含在rach-skip信息元素中(在SN/SCG变更的场景下，也可以是rach-skipSN信息元素或rach-skipSCG信息元素)，用于指示UE执行RACH-less切换以及执行RACH-less切换所需信息。所述RACH-less切换信息包含目标时间提前配置，用于指示UE切换时的目标主时间提前组(Primary Timing Advance Group，PTAG)或辅小区组变更时主辅时间提前组(Primary Secondary Timing Advance Group，PSTAG)所使用的时间提前量(记作N TA)。可选地，所述RACH-less切换信息包含上行配置信息(可记作ul-configInfo信息元素)，用于指示UE在目标基站的PUSCH传输所需要的调度信息。所述上行配置信息中包含MCS指示(记作I MCS，或者用mcsandTBS信息元素来标识)和RNTI信息。优选地，所述RNTI信息用来指示UE认为所述PUSCH是通过哪个RNTI来调度的，例如若RNTI信息设置为C-RNTI(cell-RNTI)，则UE认为所述PUSCH是通过C-RNTI调度的；若RNTI信息设置为MCS-C-RNTI，则UE认为所述PUSCH是通过MCS-C-RNTI调度的；若所述RNTI信息设置为SP-CSI-RNTI(Semi Persistent-Channel State Information-RNTI)，则UE认为所述PUSCH是通过SP-CSI-RNTI调度的；若所述RNTI信息设置为RA-RNTI(Random Access-RNTI)，则UE认为所述PUSCH是通过RA-RNTI调度的等。备选地，若所述上行配置信息中不包含所述RNTI信息，则UE认为所述PUSCH是通过C-RNTI调度的。备选地，若所述RNTI信息设置为“1”或“真”，则UE认为所述PUSCH是通过C-RNTI调度的，若所述RNTI信息设置为“0”或“假”，则UE认为所述PUSCH是通过MCS-C-RNTI调度的；反之，还可以实现为，若所述RNTI信息设置为“1”或“真”，则UE认为所述PUSCH是通过 MCS-C-RNTI调度的，若所述RNTI信息设置为“0”或“假”，则UE认为所述PUSCH是通过C-RNTI调度的。优选地，所述RNTI信息包含在所述上行配置信息中的上行许可(uplink grant)信息元素中。
在步骤503，UE根据步骤501中所接收到的所述RNTI信息和MCS指示选择用于PUSCH发送的MCS，即选择用于PUSCH发送的调制阶数和目标码率。具体地，UE结合所述RNTI信息和MCS指示按照下述原则来选择PUSCH发送的MCS：
-若所述PUSCH发送被去使能了转换预编码，若PUSCH配置信息元素中的mcs-table信息元素设置为QAM256且PUSCH是用C-RNTI或SP-CSI-RNTI调度的(以及PUSCH是以下行控制信息(Downlink Control Information，DCI)格式01分配的)，则UE使用MCS指示和MCS表2来确定PUSCH传输所使用的调制阶数和目标码率；否则若UE没有被配置MCS-C-RNTI，PUSCH配置信息元素中的mcs-table信息元素设置为QAM64lowSE且PUSCH是用C-RNTI或SP-CS-RNTI来调度且PUSCH是用在UE特定搜索空间的PDCCH来分配的，则UE使用MCS指示和MCS表3来确定PUSCH传输所使用的调制阶数和目标码率；否则若UE被配置了MCS-C-RNTI且PUSCH是用MCS-C-RNTI来调度的，则UE使用MCS指示和MCS表3来确定PUSCH发送所使用的调制阶数和目标码率；否则若配置的许可配置信息元素(configuredgrantconfig)中的mcs-table信息元素设置为QAM256且PUSCH是用CS-RNTI来调度的，则UE使用MCS指示和MCS表2来确定PUSCH发送所使用的调制阶数和目标码率；否则若配置的许可配置信息元素中的mcs-table信息元素设置为QAM64LowSE且PUSCH是用CS-RNTI来调度的，则UE使用MCS指示和MCS表3来确定PUSCH发送所使用的调制阶数和目标码率；否则，UE使用MCS指示和MCS表1来确定PUSCH发送所使用的调制阶数和目标码率。
-否则所述PUSCH发送没被去使能转换预编码，若PUSCH配置信息元素中的mcs-tabletransformprecoder信息元素设置为QAM256且PUSCH是用C-RNTI或SP-CSI-RNTI调度的(以及PUSCH是以DCI格式0_1分配的)，则UE使用MCS指示和MCS表2来确定PUSCH传输所使用的调制阶数和目标码率；否则若UE没有被配置MCS-C-RNTI，PUSCH配置信息元素中的mcs-tabletransformprecoder信息元素设置为QAM64lowSE且PUSCH是用C-RNTI或SP-CS-RNTI来调度且PUSCH是用在UE特定搜索空间的PDCCH来分配的，则UE使用MCS指示和MCS表3来确定PUSCH传输所使用的调制阶数和目标码率；否则若UE被配置了MCS-C-RNTI且PUSCH是用MCS-C-RNTI来调度的，则UE使用MCS指示和MCS表3来确定PUSCH发送所使用的调制阶数和目标码率；否则若配置的许可配置信息元素中的mcs-tabletransformprecoder信息元素设置为QAM256且PUSCH是用CS-RNTI来调度的，则UE使用MCS指示和MCS表2来确定PUSCH发送所使用的调制阶数和目标码率；否则若配置的许可配置信息元素中的mcs-tabletransformprecoder信息元素设置为QAM64LowSE且PUSCH是用CS-RNTI来调度的，则UE使用MCS指示和MCS表3来确定PUSCH发送所使用的调制阶数和目标码率；否则，UE使用MCS指示和MCS表1来确定PUSCH发送所使用的调制阶数和目标码率。
所述C-RNTI为UE在服务小区内的临时标识，所述SP-CSI-RNTI是为在PUSCH上的半静态信道状态指示信息上报所分配的UE标识。RA-RNTI指的是用于接收RAR的RNTI。所述QAM64lowSE也可以写作QAM64或64QAM。
所述PUSCH配置信息元素(PUSCH-config)用于配置应用于一个特定带宽部分(BandWidth Part，BWP)的UE特定PUSCH参数，可包括PUSCH数据加扰标识、解调参考信号配置、频率跳频配置、 码本配置等。
所述PTAG指的是双连接(Dual connectivity，DC)配置的场景下主小区组(Primary Cell group，PCG)或主基站(Master Node，MN)下的包含主小区(Primary Cell)的TAG。所述PSTAG指的是双连接(Dual connectivity，DC)配置的场景下辅小区组(Secondary Cell group，SCG)或辅基站(Secondary Node，SN)下的包含主辅小区(Primary Secondary Cell)的TAG。所述DC可以包括MN是LTE或NR及SN是LTE或NR中的任意一种组合，比如MN是LTE和SN是NR的EN-DC。
优选地，所述PUSCH指的是使用RACH-less切换中切换命令中所包含的上行许可来发送的PUSCH，可称为预配置上行许可(preconfigured uplink grant)。优选地，UE在所述PUSCH上发送对目标基站的切换响应(RRC重配置完成消息)。
实施例2
图6是示出了根据本发明的实施例2的由用户设备执行的方法的流程图。
本实施例2提出了一种RACH-less切换过程中的基于MCS表格指示和MCS指示的MCS选择方法。通过该实施例2所述的方法，UE可以确定RACH-less切换中用于向目标基站发送PUSCH所关联的MCS。
如图6所示，在步骤601，UE接收用于RACH-less切换的包含RACH-less切换信息的切换命令。所述RACH-less切换信息如LTE中RACH-less切换机制可以包含在rach-skip信息元素中(在SN/SCG变更的场景下，也可以是rach-skipSN信息元素或rach-skipSCG信息元素)，用于指示UE执行RACH-less切换以及执行RACH-less切换所需信息。所述RACH-less切换信息包含目标时间提前配置，用于指示UE切换时的目标主时间提前组(Primary Timing Advance Group，PTAG)或辅小区组变更时主辅时间提前组(Primary Secondary Timing  Advance Group，PSTAG)所使用的时间提前量(记作NTA)。可选地，所述RACH-less切换信息包含上行配置信息(可记作ul-configInfo)，用于指示UE在目标基站的PUSCH传输所需要的调度信息。所述上行配置信息中包含MCS指示(记作I MCS，或者用mcsandTBS信息元素来标识)和MCS表格指示信息。优选地，所述MCS表格指示信息可以设置为QAM256或QAM64lowSE，用于指示UE发送无转换预编码的PUSCH(PUSCH without transform precoding)时所使用的MCS表格。备选地，所述MCS表格指示信息可以设置为QAM256或QAM64lowSE，用于指示UE发送有转换预编码的PUSCH(PUSCH with transform precoding)时所使用的MCS表格。备选地，若所述上行配置信息中不包含所述MCS表格指示信息，则UE采用QAM4LowSE。优选地，所述MCS表格指示信息包含在所述上行配置信息中的上行许可(uplink grant)信息元素中。
在步骤603，UE根据步骤601中所接收到的所述MCS表格指示信息和MCS指示选择用于PUSCH发送的MCS，即选择用于PUSCH发送的调制阶数和目标码率。
优选地，对转换预编码被去使能了的一个PUSCH发送，若RACH-less切换信息中的所述MCS表格指示信息设置为QAM256，则UE使用RACH-less切换信息中包含的所述MCS指示和MCS表2来确定用于PUSCH的调度阶数和目标码率。备选地，对转换预编码没有被去使能了的一个PUSCH发送或者说对使能了转换预编码的一个PUSCH发送，若RACH-less切换信息中的所述MCS表格指示信息设置为QAM256，则UE使用RACH-less切换信息中包含的所述MCS指示和MCS表2来确定用于PUSCH的调度阶数和目标码率。
备选地，对转换预编码被去使能了的一个PUSCH发送，若RACH-less切换信息中的所述MCS表格指示信息设置为QAM64lowSE，则UE使用RACH-less切换信息中包含的所述MCS指示和MCS表3来确定用于PUSCH的调度阶数和目标码率。备选地，对转换预编码没有被去使能了的一个PUSCH发送或者说对使能了转 换预编码的一个PUSCH发送，若RACH-less切换信息中的所述MCS表格指示信息设置为QAM64lowSE，则UE使用RACH-less切换信息中包含的所述MCS指示和MCS表3来确定用于PUSCH的调度阶数和目标码率。所述QAM64lowSE也可以写作QAM64或64QAM。
所述PTAG指的是双连接(Dual connectivity，DC)配置的场景下主小区组(Primary Cell group，PCG)或主基站(Master Node，MN)下的包含主小区(Primary Cell)的TAG。所述PSTAG指的是双连接(Dual connectivity，DC)配置的场景下辅小区组(Secondary Cell group，SCG)或辅基站(Secondary Node，SN)下的包含主辅小区(Primary Secondary Cell)的TAG。所述DC可以包括MN是LTE或NR及SN是LTE或NR中的任意一种组合，比如MN是LTE和SN是NR的EN-DC。
优选地，所述PUSCH指的是使用RACH-less切换中切换命令中所包含的上行许可来发送的PUSCH，可称为预配置上行许可(preconfigured uplink grant)。优选地，UE在所述PUSCH上发送对目标基站的切换响应(RRC重配置完成消息)。
实施例3
图7是示出了根据本发明的实施例3的由用户设备执行的方法的流程图。
本实施例3提出了一种在RACH-less切换过程中判断切换成功的方法，在UE侧执行。
如图7所示，在步骤701，UE接收作为切换目的地的目标基站发送的PDCCH和物理下行共享信道(Physical Downlink Shared Channel，PDSCH)。其中，UE接收PDSCH是可选的。
在步骤703，若UE被配置了rach-skip或rach-skipSCG或rach-skipSN，即，UE被配置了RACH-less切换信息，则UE的媒介接入控制(Medium Access Control，MAC)层向RRC层指示以MCS-C-RNTI寻址的PDCCH传输的成功接收。
在步骤705，若MAC层指示了以MCS-C-RNTI寻址的PDCCH传 输的成功接收，且UE被配置了RACH-less切换信息，则UE RRC层认为RACH-less切换成功。此时，UE执行下述操作：
操作1：停止切换检测定时器T304；
操作2：释放RACH-less切换配置，即释放rach-skip或rach-skipSN或rach-skipSCG信息元素的配置。其中rach-skip信息元素用于MCG/MN的切换中的RACH-less切换配置，rach-skipSN或rach-skipSCG信息元素用于SCG/SN的变更(或称同步重配置(reconfiguration with sync))中的RACH-less配置。
所述UE被配置了RACH-less切换也可以描述为UE被配置了rach-skip信息元素或rach-skipSN或rach-skipSCG信息元素。
更进一步地，在步骤703中，若MAC实体被配置了rach-skip或rach-skipSCG或rach-skipSN且所收到的PDSCH上收到了一个UE竞争解决标识MAC控制元素，并且所述接收到的PDSCH是由特殊小区(special cell，SpCell)的由MCS-C-RNTI寻址的PDCCH所指示的，则向RRC层指示以MCS-C-RNTI寻址的一个PDCCH传输的成功接收。所述SpCell在DC配置下指的是MCG的主小区或SCG的主辅小区PSCell，否则在不配置DC的场景下，其指的是主小区PCell；一个SpCell支持物理上行控制信道(Physical Uplink Control Channel，PUCCH)发送和基于竞争的随机接入且总是处于激活状态。
实施例4
图8是示出了根据本发明的实施例4的由用户设备执行的方法的流程图。
本实施例4提出了一种在RACH-less切换过程中判断切换成功的方法，在UE侧执行。
如图8所示，在步骤801：UE接收作为切换目的地的目标基站发送的PDCCH和物理下行共享信道(Physical Downlink Shared Channel，PDSCH)。其中，UE接收PDSCH是可选的。
在步骤803，若UE被配置了rach-skip或rach-skipSCG或rach-skipSN， 即，UE被配置了RACH-less切换信息，则UE的媒介接入控制(Medium Access Control，MAC)层向RRC层指示以SP-CSI-RNTI寻址的PDCCH传输的成功接收。
在步骤805，若MAC层指示了以SP-CSI-RNTI寻址的PDCCH传输的成功接收，且UE被配置了RACH-less切换，则UE RRC层认为RACH-less切换成功。此时，UE执行下述操作：
操作1：停止切换检测定时器T304；
操作2：释放RACHless切换配置，即释放rach-skip或rach-skipSN或rach-skipSCG信息元素的配置。其中rach-skip信息元素用于MCG/MN的切换中的RACH-less切换配置，rach-skipSN或rach-skipSCG信息元素用于SCG/SN的变更(或称同步重配置(reconfiguration with sync))中的RACH-less配置。
所述UE被配置了RACH-less切换也可以描述为UE被配置了rach-skip信息元素或rach-skipSN或rach-skipSCG信息元素。
更进一步地，在步骤803中，若MAC实体被配置了rach-skip或rach-skipSCG或rach-skipSN且所收到的PDSCH上收到了一个UE竞争解决标识MAC控制元素，并且所述接收到的PDSCH是由特殊小区(special cell，SpCell)的由SP-CSI-RNTI寻址的PDCCH所指示的，则向RRC层指示以SP-CSI-RNTI寻址的一个PDCCH传输的成功接收。所述SpCell在DC配置下指的是MCG的主小区或SCG的主辅小区PSCell，否则在不配置DC的场景下，其指的是主小区PCell；一个SpCell支持物理上行控制信道(Physical Uplink Control Channel，PUCCH)发送和基于竞争的随机接入且总是处于激活状态。
在本申请中，“基站”是指具有较大发射功率和较广覆盖面积的移动通信数据和控制交换中心，包括资源分配调度、数据接收发送等功能。“用户设备”是指用户移动终端，例如包括移动电话、笔记本等可以与基站或者微基站进行无线通信的终端设备。
上文已经结合优选实施例对本发明的方法和涉及的设备进行了描 述。本领域技术人员可以理解，上面示出的方法仅是示例性的。本发明的方法并不局限于上面示出的步骤和顺序。上面示出的基站和用户设备可以包括更多的模块，例如还可以包括可以开发的或者将来开发的可用于基站、MME、或UE的模块等等。上文中示出的各种标识仅是示例性的而不是限制性的，本发明并不局限于作为这些标识的示例的具体信元。本领域技术人员根据所示实施例的教导可以进行许多变化和修改。
图9是表示本发明的一个实施例所涉及的用户设备UE的框图。如图9所示，该用户设备UE90包括处理器901和存储器902。处理器901例如可以包括微处理器、微控制器、嵌入式处理器等。存储器902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)、或其他存储器等。存储器902上存储有程序指令。该指令在由处理器901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。
运行在根据本发明的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本发明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。
用于实现本发明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，本发明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，本发明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，但本发明并不局限于此。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，已经参考附图对本发明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，本发明也包括不偏离本发明主旨的任何设计改动。另外，可以在权利要求的范围内对本发明进行多种改动，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发明的技术范围内。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. 一种由用户设备执行的方法，包括：
    接收用于无随机接入切换的包含无随机接入切换信息的切换命令；以及
    根据所接收到的所述切换命令中所包含的所述无随机接入切换信息中的无线网络临时标识RNTI信息和调制编码方案MCS指示，选择用于物理上行共享信道PUSCH发送的MCS方案。
  2. 根据权利要求1所述的方法，其中，
    所述无随机接入切换信息至少包含：目标时间提前配置信息和上行配置信息，
    所述上行配置信息至少包含所述RNTI信息和所述MCS指示。
  3. 一种由用户设备执行的方法，包括：
    接收用于无随机接入切换的包含无随机接入切换信息的切换命令；以及
    根据所接收到的所述切换命令中所包含的所述无随机接入切换信息中的调制编码方案MCS表格指示信息和MCS指示，选择用于PUSCH发送的MCS方案。
  4. 根据权利要求3所述的方法，其中，
    所述无随机接入切换信息至少包含：目标时间提前配置信息和上行配置信息，
    所述上行配置信息至少包含所述MCS表格指示信息和所述MCS指示。
  5. 一种由用户设备执行的方法，包括：
    接收作为切换目的地的目标基站发送的物理下行控制信道PDCCH和物理下行共享信道PDSCH；
    若所述用户设备被配置了无随机接入切换信息，则所述用户设备的媒介接入控制MAC层向无线资源控制RRC层指示以调制编码方案-小区无线网络临时标识即MCS-C-RNTI寻址的PDCCH传输的成功接 收；以及
    若所述MAC层指示了以所述MCS-C-RNTI寻址的所述PDCCH传输的成功接收，且所述用户设备被配置了所述无随机接入切换信息，则所述用户设备的所述RRC层认为无随机接入切换成功。
  6. 根据权利要求5所述的方法，其中，
    若所述媒介接入控制MAC层被配置了所述无随机接入切换信息且在所接收到的所述PDSCH上收到了用户设备竞争解决标识MAC控制元素，并且所述接收到的所述PDSCH是由特殊小区的由所述MCS-C-RNTI寻址的PDCCH所指示的，则向所述用户设备的所述RRC层指示以所述MCS-C-RNTI寻址的所述PDCCH传输的成功接收。
  7. 一种由用户设备执行的方法，包括：
    接收作为切换目的地的目标基站发送的物理下行控制信道PDCCH和物理下行共享信道PDSCH；
    若所述用户设备被配置了无随机接入切换信息，则所述用户设备的媒介接入控制MAC层向无线资源控制RRC层指示以半静态信道状态信息-无线网络临时标识即SP-CSI-RNTI寻址的PDCCH传输的成功接收；以及
    若所述MAC层指示了以所述SP-CSI-RNTI寻址的所述PDCCH传输的成功接收，且所述用户设备被配置了所述无随机接入切换信息，则所述用户设备的所述RRC层认为无随机接入切换成功。
  8. 根据权利要求7所述的方法，其中，
    若所述媒介接入控制MAC层被配置了所述无随机接入切换信息且在所接收到的所述PDSCH上收到了用户设备竞争解决标识MAC控制元素，并且所述接收到的所述PDSCH是由特殊小区的由所述SP-CSI-RNTI寻址的PDCCH所指示的，则向所述用户设备的所述RRC层指示以所述SP-CSI-RNTI寻址的所述PDCCH传输的成功接收。
  9. 根据权利要求1、3、5和7中任一项所述的方法，其中，
    所述切换命令为包含同步重配置信息元素或移动控制信息信息元素的无线资源控制RRC重配置消息。
  10. 一种用户设备，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、3、5和7中任一项所述的方法。
PCT/CN2019/097917 2018-07-31 2019-07-26 由用户设备执行的方法以及用户设备 WO2020024880A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810859894.8 2018-07-31
CN201810859894.8A CN110784895A (zh) 2018-07-31 2018-07-31 由用户设备执行的方法以及用户设备

Publications (1)

Publication Number Publication Date
WO2020024880A1 true WO2020024880A1 (zh) 2020-02-06

Family

ID=69230789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/097917 WO2020024880A1 (zh) 2018-07-31 2019-07-26 由用户设备执行的方法以及用户设备

Country Status (2)

Country Link
CN (1) CN110784895A (zh)
WO (1) WO2020024880A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022089200A1 (zh) * 2020-10-31 2022-05-05 华为技术有限公司 用于小区切换的方法和装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021226836A1 (en) * 2020-05-12 2021-11-18 Lenovo (Beijing) Limited Method and apparatus for an enhanced failure report mechanism for mcg and scg
CN116097745A (zh) * 2020-07-23 2023-05-09 华为技术有限公司 一种用于接入回传一体化iab系统中的通信方法和通信装置
CN114245473A (zh) * 2020-09-09 2022-03-25 成都鼎桥通信技术有限公司 随机接入的方法、装置、电子设备及存储介质
WO2023133740A1 (zh) * 2022-01-12 2023-07-20 Oppo广东移动通信有限公司 通信方法、终端设备以及网络设备
CN118044263A (zh) * 2022-07-12 2024-05-14 深圳传音控股股份有限公司 小区切换方法、通信设备及存储介质
CN116321438A (zh) * 2023-04-03 2023-06-23 成都启庚科技有限公司 一种基于正交扰码的小区crnti规划方法及装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101998553A (zh) * 2009-08-14 2011-03-30 大唐移动通信设备有限公司 上行资源的分配方法和设备
US20180020382A1 (en) * 2016-07-13 2018-01-18 Samsung Electronics Co., Ltd. Access control method and apparatus for use in mobile communication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101998553A (zh) * 2009-08-14 2011-03-30 大唐移动通信设备有限公司 上行资源的分配方法和设备
US20180020382A1 (en) * 2016-07-13 2018-01-18 Samsung Electronics Co., Ltd. Access control method and apparatus for use in mobile communication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022089200A1 (zh) * 2020-10-31 2022-05-05 华为技术有限公司 用于小区切换的方法和装置

Also Published As

Publication number Publication date
CN110784895A (zh) 2020-02-11

Similar Documents

Publication Publication Date Title
WO2020024880A1 (zh) 由用户设备执行的方法以及用户设备
US20200112999A1 (en) Mac layer communication for parallel random access procedures of dual connectivity
JP6622286B2 (ja) デュアルｐｕｃｃｈのためのタイミングアライメントプロシージャ
US10959138B2 (en) Terminal apparatus, base station apparatus, communication method, and control method
US10986592B2 (en) Method related to power headroom report of user, user equipment, base station, and computer-readable medium
WO2018105725A1 (ja) 端末装置、基地局装置、通信方法、および、集積回路
WO2015115206A1 (ja) 移動通信システム及び移動局装置
WO2019179514A1 (zh) 在用户设备上运行的方法及用户设备
WO2016170983A1 (ja) 端末装置、基地局装置、集積回路、および、通信方法
WO2016171046A1 (ja) 端末装置、基地局装置、集積回路、および、通信方法
JP6725516B2 (ja) 端末装置、および通信方法
JP2020502918A (ja) 上りリンク伝送制御方法及びその装置、通信システム
US20220393794A1 (en) Timer handling in multiple active grant configurations
WO2016171010A1 (ja) 端末装置、基地局装置、集積回路、および、通信方法
US11425613B2 (en) Information block (IB) acquisition based on quasi-stationary IB content
KR20210018418A (ko) 사용자 장비에 의해 구현되는 방법 및 사용자 장비
US10299308B2 (en) Terminal device, communication method, and integrated circuit
WO2021056570A1 (zh) 无线通信方法、装置和系统
WO2024024460A1 (ja) 中央ユニット、分散ユニット、無線アクセスネットワークノード、ｕｅ、及びこれらの方法
WO2018163907A1 (ja) 端末装置、基地局装置、通信方法、および、集積回路
CN115643823A (zh) 测量间隙配置的激活
BR112020009624A2 (pt) método, aparelho e meio codificado com instruções

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19845163

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19845163

Country of ref document: EP

Kind code of ref document: A1