WO2017118197A1 - Procédé et appareil de commande d'accès aléatoire - Google Patents

Procédé et appareil de commande d'accès aléatoire Download PDF

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Publication number
WO2017118197A1
WO2017118197A1 PCT/CN2016/104592 CN2016104592W WO2017118197A1 WO 2017118197 A1 WO2017118197 A1 WO 2017118197A1 CN 2016104592 W CN2016104592 W CN 2016104592W WO 2017118197 A1 WO2017118197 A1 WO 2017118197A1
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Prior art keywords
random access
prach
index
rnti
rar
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PCT/CN2016/104592
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English (en)
Chinese (zh)
Inventor
邹伟
戴博
沙秀斌
陆婷
戴谦
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中兴通讯股份有限公司
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Priority claimed from CN201610111930.3A external-priority patent/CN106941730A/zh
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2017118197A1 publication Critical patent/WO2017118197A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • This document relates to, but is not limited to, wireless communication technologies, and in particular, to a random access control method and apparatus.
  • M2M (Machine to Machine) communication is an important subject of 5G (5th Generation, 5th generation mobile communication technology) research and an important application field of wireless communication in the future.
  • 3GPP The 3rd Generation Partnership Project
  • NB-IoT Narrow Band Internet of Things
  • the goal is to build a system similar to the LTE (Long-Term Evolution) system in the 200 kHz band to provide low-throughput wireless communication services for low-cost terminals.
  • the downlink still uses OFDMA (Orthogonal Frequency Division Multiple Access) technology, and SC-FDMA (Single Carrier-Frequency Division Multiple Access) technology is adopted in the uplink, and the LTE system is reused or simplified as much as possible.
  • the existing functional modules The subcarrier width increases the subcarrier width of 3.75 KHz in the uplink in addition to the subcarrier width of 15 KHz in the LTE system to further enhance the coverage capability of the uplink of the machine terminal.
  • the random access preamble in the NB-IoT system can be single-tone (single sub-carrier) or multi-tone (multiple).
  • Subcarriers, and NB-IoT systems also need to consider different coverage levels to support multiple coverage scenarios.
  • the random access preamble of a single subcarrier occupies only one OFDM (Orthogonal Frequency Division Multiplexing) system subcarrier bandwidth; and the random access preamble of multiple subcarriers can occupy multiple OFDM system subcarriers. bandwidth.
  • RA-RNTI Random Access-Radio Network Temporary Identity, random access wireless network temporary identification
  • the user terminal uses the RA-RNTI corresponding to the PRACH (Physical Random Access Channel) of the random access preamble to perform RAR reception in the subsequent random access response window.
  • the RA-RNTI used by the user equipment is based on the first subframe number (0 to 9) where the PRACH of the random access preamble is located, and the index of the PRACH in the frequency domain of the random access preamble is transmitted (0 to 5) Calculated. It can be seen that the traditional RA-RNTI calculation method is calculated by using the subframe number and the frequency index number as parameters, and supports the identification of the PRACH in a range of 10 ms.
  • the type of random access channel of the NB-IoT system is complex, and related technologies cannot support the identification of different types of random access channels.
  • the random access preamble of a single subcarrier will be longer, which may reach or exceed the length of a 10 ms frame.
  • the RA-RNTI calculation method of the traditional LTE system cannot be applied to each new NB-IoT system. characteristic.
  • the NB-IoT system needs to perform multiple repeated transmissions (RARs). Therefore, the random access response window in the NB-IoT system may be relatively long, and may even exceed the frame length of 10 ms, and the RAR format in the related art cannot be applied.
  • the embodiment of the invention designs a new random access procedure control method and device for the NB-IoT system, which can support multiple types of random access.
  • a random access control method includes:
  • the user terminal receives all or part of random access configuration parameters of one or more random access types from the system broadcast message;
  • the random access configuration parameter includes any one or more of the following information: a random access channel Type, random access preamble format, random access channel frame configuration, random access channel subframe configuration, random access radio network temporary identifier RA-RNTI calculation parameter, random access Responding to the RAR window start time, the RAR window size, and the RAR format indication information;
  • the user terminal selects a random access type
  • the user terminal performs random access according to the random access configuration parameter of the selected random access type.
  • performing random access by the user terminal according to the random access configuration parameter of the selected random access type includes any one or more of the following:
  • the user terminal selects a physical random access channel (PRACH) used by the random access according to the random access channel type, the random access channel frame configuration, and the random access channel subframe configuration;
  • PRACH physical random access channel
  • the user terminal selects a random access preamble according to the random access preamble format and sends the random access preamble;
  • the user terminal performs RAR monitoring according to the random access response RAR window start time and the RAR window size;
  • the user terminal decodes and interprets the RAR message according to the RAR format indication information.
  • the random access type includes any one or more of the following:
  • Multi-subcarrier random access single subcarrier random access, and random access with different coverage levels.
  • the receiving, by the user terminal, the random access configuration parameter of the one or more random access types from the system broadcast message includes:
  • the user terminal receives random access configuration parameters of random access and single subcarrier random access of each coverage level from system broadcast messages supporting all coverage levels.
  • the random access channel frame configuration includes a period value, where the period value is used to indicate a configuration period of a physical random access channel PRACH in units of frames.
  • the random access channel frame configuration includes starting to configure a physical random access channel.
  • the initial frame index of the PRACH which is used to indicate the system frame in which the PRACH configuration is started.
  • the RA-RNTI calculation parameter includes:
  • the frame number factor indication is used to indicate whether to use a frame number index as an RA-RNTI calculation factor
  • the frame number calculation parameter is used to indicate a frame number for calculating the RA-RNTI Index
  • the frame number index is one or more bits in the frame number, or is the result of the frame number modulo operation on the predetermined constant.
  • the RA-RNTI calculation parameter includes: a frame number mask
  • the result of the AND operation of the frame number mask and the system frame number is used to perform the calculation of the RA-RNTI.
  • the RA-RNTI calculation parameter includes: a frequency index of the PRACH; and the frequency index of the PRACH is an index of one or more subcarriers occupied by the PRACH.
  • the RA-RNTI calculation parameter includes:
  • the range indication of the RA-RNTI value of the corresponding random access type includes any one or more of the following: the RA-RNTI start value, the number of subsequent RA-RNTIs, and the subsequent calculation of the RA-RNTI that can be selected. method.
  • the range of the RA-RNTI value is completely or partially repeated; or, the range of the RA-RNTI value is not repeated.
  • the RA-RNTI calculation parameter includes: a PRACH type factor; the PRACH type factor is used to distinguish different types of PRACH.
  • the RAR format includes:
  • a PRACH index field used to indicate a PRACH type and/or a PRACH channel; or a code sequence used to indicate a different random access preamble format and/or a random access preamble.
  • the PRACH index information carried in the PRACH index field is any one of the following:
  • the PRACH index field uses a reserved field in the RAR message
  • the RAR message adopts a RAR format including a PRACH index field.
  • the method further includes: when the RAR format indication information is not included in the random access configuration parameter, the reserved bit in the RAR message is used as the RAR format indication information.
  • the RAR format indication information is a format index.
  • a random access control method includes:
  • the base station sends all or part of random access configuration parameters of one or more random access types by using a system broadcast message;
  • the random access configuration parameter includes any one or more of the following information: a random access channel type, Random access preamble format, random access channel frame configuration, random access channel subframe configuration, random access radio network temporary identifier RA-RNTI calculation parameter, random access response RAR window start time, RAR window size, RAR format indication information;
  • the base station After receiving the random access preamble sent by the user equipment, the base station returns a corresponding random access response RAR message.
  • the random access type includes any one or more of the following:
  • Multi-subcarrier random access single subcarrier random access, random access with different coverage levels.
  • the sending, by the base station, the random access configuration parameters of the one or more random access types by using the system broadcast message includes:
  • the base station transmits random access configuration parameters of random access and single subcarrier random access of each coverage level in a system broadcast message supporting all coverage levels.
  • the random access channel frame configuration includes a period value, where the period value is used to indicate a configuration period of the PRACH in units of frames.
  • the random access channel frame configuration includes an initial frame index that starts to configure a PRACH, where The initial frame index is used to indicate a system frame in which the PRACH configuration is started.
  • the RA-RNTI calculation parameter includes:
  • the frame number factor indication is used to indicate whether to use a frame number index as an RA-RNTI calculation factor
  • the frame number calculation parameter is used to indicate a frame number for calculating the RA-RNTI Index
  • the frame number index is one or more bits in the frame number, or is the result of the frame number modulo operation on the predetermined constant.
  • the RA-RNTI calculation parameter includes: a frame number mask
  • the result of the AND operation of the frame number mask and the system frame number is used to perform the calculation of the RA-RNTI.
  • the RA-RNTI calculation parameter includes: a frequency index of the PRACH; and the frequency index of the PRACH is an index of one or more subcarriers occupied by the PRACH.
  • the RA-RNTI calculation parameter includes:
  • the range indication of the RA-RNTI value of the corresponding random access type includes any one or more of the following: the RA-RNTI start value, the number of subsequent RA-RNTIs, and the subsequent calculation of the RA-RNTI that can be selected. method.
  • the range of the RA-RNTI value is completely or partially repeated; or, the range of the RA-RNTI value is not repeated.
  • the RA-RNTI calculation parameter includes: a PRACH type factor; the PRACH type factor is used to distinguish different types of PRACH.
  • the RAR format includes:
  • a PRACH index field used to indicate a PRACH type and/or a PRACH channel; or a code sequence used to indicate a different random access preamble format and/or a random access preamble.
  • the PRACH index information carried in the PRACH index field is any one of the following:
  • the base station uses the reserved field in the RAR message to carry the PRACH index field;
  • the RAR message returned by the base station adopts a RAR format including a PRACH index field.
  • the base station carries RAR format indication information in a reserved bit in the RAR message.
  • the RAR format indication information is a format index.
  • a random access control device located at a user terminal, includes:
  • a receiving module configured to receive all or part of random access configuration parameters of one or more random access types from a system broadcast message;
  • the random access configuration parameter includes one or more of the following information: random access Incoming channel type, random access preamble format, random access channel frame configuration, random access channel subframe configuration, random access radio network temporary identifier RA-RNTI calculation parameter, random access response RAR window start time, RAR window size , RAR format indication information;
  • the random access module is configured to perform random access according to the random access configuration parameter of the selected random access type.
  • the random access module is configured to perform random access according to the random access configuration parameter of the selected random access type by using any one or more of the following:
  • the random access module selects a physical random access channel PRACH used by the random access according to the random access channel type, the random access channel frame configuration, and the random access channel subframe configuration;
  • the random access module selects a random access preamble according to the random access preamble format and sends the random access preamble;
  • the random access module determines, according to the RA-RNTI calculation parameter, an RA-RNTI used for receiving the RAR;
  • the random access module performs RAR monitoring according to the random access response RAR window start time and the RAR window size
  • the random access module decodes and interprets the RAR message according to the RAR format indication information.
  • the random access type includes any one or more of the following:
  • Multi-subcarrier random access single subcarrier random access, and random access with different coverage levels.
  • the receiving module is configured to receive random access configuration parameters of one or more random access types from the system broadcast message by:
  • the receiving module receives random access configuration parameters of random access and single subcarrier random access of each coverage level from system broadcast messages supporting all coverage levels.
  • the random access channel frame configuration includes a period value, where the period value is used to indicate a configuration period of the PRACH in units of frames.
  • the random access channel frame configuration includes an initial frame index that starts to configure a PRACH, where the initial frame index is used to indicate a system frame that starts a PRACH configuration.
  • the RA-RNTI calculation parameter includes:
  • the frame number factor indication is used to indicate whether to use a frame number index as an RA-RNTI calculation factor
  • the frame number calculation parameter is used to indicate a frame number for calculating the RA-RNTI Index
  • the frame number index is one or more bits in the frame number, or is the result of the frame number modulo operation on the predetermined constant.
  • the RA-RNTI calculation parameter includes: a frame number mask
  • the result of the AND operation of the frame number mask and the system frame number is used to perform the calculation of the RA-RNTI.
  • the RA-RNTI calculation parameter includes: a frequency index of the PRACH; and the frequency index of the PRACH is an index of one or more subcarriers occupied by the PRACH.
  • the RA-RNTI calculation parameter includes:
  • the range indication of the corresponding RA-RNTI value of the random access type includes any one or more of the following: the RA-RNTI start value, the number of subsequent RA-RNTIs, and the subsequent RA-RNTI that can be selected. Calculation method.
  • the range of the RA-RNTI value is completely or partially repeated; or, the range of the RA-RNTI value is not repeated.
  • the RA-RNTI calculation parameter includes: a PRACH type factor; the PRACH type factor is used to distinguish different types of PRACH.
  • the RAR format includes:
  • a PRACH index field used to indicate a PRACH type and/or a PRACH channel; or a code sequence used to indicate a different random access preamble format and/or a random access preamble.
  • the PRACH index information carried in the PRACH index field is any one of the following:
  • the PRACH index field uses a reserved field in the RAR message
  • the RAR message adopts a RAR format including a PRACH index field.
  • the reserved bit in the RAR message is used as the RAR format indication information.
  • the RAR format indication information is a format index.
  • a random access control device located at a base station, comprising:
  • a sending module configured to send all or part of random access configuration parameters of one or more random access types by using a system broadcast message;
  • the random access configuration parameter includes any one or more of the following information: random connection Incoming channel type, random access preamble format, random access channel frame configuration, random access channel subframe configuration, random access radio network temporary identifier RA-RNTI calculation parameter, random access response RAR window start time, RAR window size , RAR format indication information;
  • the feedback module is configured to: after receiving the random access preamble sent by the user terminal, return a corresponding random access response RAR message.
  • the random access type includes any one or more of the following:
  • Multi-subcarrier random access single subcarrier random access, random access with different coverage levels.
  • the sending module is configured to send random access configuration parameters of one or more random access types by using a system broadcast message by:
  • the sending module sends a random access configuration parameter of random access and single subcarrier random access of each coverage level in a system broadcast message supporting all coverage levels.
  • the random access channel frame configuration includes a period value, where the period value is used to indicate a configuration period of the PRACH in units of frames.
  • the random access channel frame configuration includes an initial frame index that starts to configure a PRACH, where the initial frame index is used to indicate a system frame that starts a PRACH configuration.
  • the RA-RNTI calculation parameter includes:
  • the frame number factor indication is used to indicate whether to use a frame number index as an RA-RNTI calculation factor
  • the frame number calculation parameter is used to indicate a frame number for calculating the RA-RNTI Index
  • the frame number index is one or more bits of the frame number, or is the result of the frame number modulo operation on the predetermined constant.
  • the RA-RNTI calculation parameter includes: a frame number mask
  • the result of the AND operation of the frame number mask and the system frame number is used to perform the calculation of the RA-RNTI.
  • the RA-RNTI calculation parameter includes: a frequency index of the PRACH; and the frequency index of the PRACH is an index of one or more subcarriers occupied by the PRACH.
  • the RA-RNTI calculation parameter includes:
  • the range indication of the corresponding RA-RNTI value of the random access type includes any one or more of the following: the RA-RNTI start value, the number of subsequent RA-RNTIs, and the subsequent RA-RNTI that can be selected. Calculation method.
  • the range of the RA-RNTI value is completely or partially repeated; or, the range of the RA-RNTI value is not repeated.
  • the RA-RNTI calculation parameter includes: a PRACH type factor; the PRACH type factor is used to distinguish different types of PRACH.
  • the RAR format includes:
  • a PRACH index field used to indicate a PRACH type and/or a PRACH channel; or a code sequence used to indicate a different random access preamble format and/or a random access preamble.
  • the PRACH index information carried in the PRACH index field is any one of the following:
  • the feedback module is configured to carry the PRACH index field by using a reserved field in the RAR message
  • the feedback module is configured to adopt a RAR format including a PRACH index field for the returned RAR message.
  • the feedback module is further configured to: when the RAR format indication information is not included in the random access configuration parameter, carry the RAR format indication information in the reserved bit in the RAR message.
  • the RAR format indication information is a format index.
  • the embodiment of the present invention provides a new method and apparatus for controlling a random access procedure, which is applicable to an NB-IoT system, and can support both single-subcarrier random access and multi-sub-support. Carrier random access and support for identification of a wider range of random access channels.
  • the alternative of the embodiments of the present invention provides a flexible RA-RNTI calculation method, different types or The coverage level PRACH can use different ranges of RA-RNTI values and reuse the same range of RA-RNTI values.
  • the optional solution of the embodiment of the present invention provides RAR format indication information, and can support RARs of different formats.
  • the user terminals transmitting the random access preamble on different PRACH types or different PRACHs can be demodulated using the same RA-RNTI, thereby simplifying the RA-RNTI related processing.
  • Embodiment 1 is a schematic flowchart of a method for controlling random access according to Embodiment 1;
  • FIG. 2 is a schematic flowchart of a method for controlling random access according to Embodiment 2;
  • FIG. 3 is a schematic diagram of a signaling procedure of a random access control procedure supporting different PRACH types provided by Embodiment 1;
  • FIG. 4A and FIG. 4B are schematic diagrams showing a frame number factor used by a base station according to Embodiment 2 to notify a user terminal to calculate an RA-RNTI;
  • Embodiment 5 is a schematic diagram of a base station provided by Embodiment 3 to notify a user terminal of a RA-RNTI range corresponding to a certain PRACH type;
  • FIG. 6A and FIG. 6B are schematic diagrams showing a PRACH type indication by using a reserved field in a RAR message of a legacy LTE system according to Embodiment 5;
  • FIG. 7A and FIG. 7B are schematic diagrams showing a PRACH type or channel indication by using a new RAR format provided by Embodiment 6;
  • FIG. 8 is a schematic diagram of a random access control apparatus of Embodiment 3.
  • Figure 9 is a schematic diagram of a random access control device of the fourth embodiment.
  • Embodiment 1 A control method for random access, as shown in FIG. 1 , includes:
  • the user terminal receives all or part of random access configuration parameters of one or more random access types from a system broadcast message, where the random access configuration parameter includes one or more of the following information: random access Channel type, random access preamble format, random access channel frame configuration, random access channel subframe configuration, random access radio network temporary identifier RA-RNTI calculation parameter, random access response RAR window start time, RAR window size, RAR format indication information;
  • the user terminal selects a random access type.
  • the user terminal performs random access according to the random access configuration parameter of the selected random access type.
  • one or more pieces of information in the random access configuration parameter may be specified by a standard protocol or pre-agreed, that is, part of the random access configuration parameter that is not sent in the system broadcast message may be agreed in advance, or As specified in the standard agreement.
  • one or more sets of new random access configuration parameters are introduced in the system broadcast message, and each set of parameters is specifically configured for configuring a random access type (for example, single subcarrier random access).
  • the random access configuration parameter may include one or more of the following information: a random access channel type, a random access preamble format, a random access channel frame configuration, a random access channel subframe configuration, and an RA-RNTI calculation parameter.
  • performing random access by the user terminal according to the random access configuration parameter of the selected random access type includes any one or more of the following:
  • the user terminal selects a physical random access channel (PRACH) used by the random access according to the random access channel type, the random access channel frame configuration, and the random access channel subframe configuration;
  • PRACH physical random access channel
  • the user terminal selects a random access preamble according to the random access preamble format and sends the random access preamble;
  • the user terminal according to the random access response RAR window start time, the RAR window is large Small RAR monitoring;
  • the user terminal decodes and interprets the RAR message according to the RAR format indication information.
  • the user terminal may perform corresponding operations according to the traditional practices or the standard protocol; for example, if the random access configuration parameter does not include the RAR format indication information, the user terminal may Use the traditional RAR format, or use the RAR format specified in the standard protocol.
  • the random access type includes any one or more of the following:
  • Multi-subcarrier random access single subcarrier random access, random access with different coverage levels.
  • the random access type includes a new random access type in addition to the multi-subcarrier random access type used by the traditional LTE, and may include any one or any of the following: a new multi-sub Carrier random access, new single-subcarrier random access, and random access with different coverage levels.
  • the receiving, by the user terminal, the random access configuration parameter of the one or more random access types from the system broadcast message may include:
  • the user terminal receives random access configuration parameters of random access and single subcarrier random access of each coverage level from system broadcast messages supporting all coverage levels.
  • the base station may selectively include random access configuration parameters with a random access type of a single subcarrier and a certain coverage level in a system broadcast message of a corresponding coverage level, or may be included in all coverage levels supported by the base station. Unified system broadcast messages.
  • the RA-RNTI calculation parameter includes: a frame number factor
  • the frame number factor includes two defined forms:
  • the RA-RNTI calculation parameter includes: a frame number factor indication, and/or a frame number calculation parameter, where the frame number factor indication is used to indicate whether a frame number index is used as the RA-RNTI calculation factor,
  • the frame number calculation parameter is used to indicate a frame number index for calculating the RA-RNTI;
  • the frame number index may be one or more bits in the frame number (such as but not limited to being the last few bits of the frame number), It may be the result of the modulo operation of the frame number on the predetermined constant.
  • the result of the modulo operation is a remainder obtained by dividing the frame number by a predetermined constant.
  • the frame number calculation parameter may be flexibly determined according to the size of the RAR window that the system needs to support.
  • one or more bits of the RA-RNTI calculation, or the result of the modulo operation is the frame number factor.
  • the frame number factor indication may occupy one bit, and the frame number calculation parameter may be one or more bits.
  • the RA-RNTI calculation parameter includes: a frame number mask
  • the result of the AND operation of the frame number mask and the system frame number is used for performing the calculation of the RA-RNTI, that is, the result of performing the AND operation of the frame number mask and the system frame number as a frame number factor; the frame number factor It will be substituted into the calculation of RA-RNTI.
  • the frame number mask when the frame number mask is all zeros, it may indicate that the RA-RNTI calculation is not performed using the frame number factor, or the value of the frame number factor is zero.
  • the RA-RNTI calculation parameter includes: a frequency index of the PRACH.
  • the frequency index of the PRACH may be, but is not limited to, an index of one or more subcarriers occupied by the PRACH.
  • the RA-RNTI calculation parameter may include:
  • the range indication of the RA-RNTI value of the corresponding random access type includes any one or more of the following: RA-RNTI start value, number of subsequent RA-RNTIs, and calculation of subsequent optional RA-RNTI Method, etc.
  • the RA-RNTI calculation parameter includes a range indication of the RA-RNTI value of the first random access type; and a random access configuration parameter corresponding to the second random access type.
  • the RA-RNTI calculation parameter includes a range indication of the RA-RNTI value of the second random access type.
  • the range of RA-RNTI values may be fully or partially repeated to reuse RA-RNTI resources in different types or coverage levels of random access.
  • the range of the RA-RNTI value may not be repeated.
  • this embodiment proposes the following two alternatives:
  • the RA-RNTI calculation parameter may include: a PRACH type factor; the PRACH type factor is used to distinguish different types of PRACH.
  • the user terminal can calculate different RA-RNTI values according to different PRACH type factors.
  • the values of the PRACH type factors corresponding to the different types of PRACHs in the RA-RNTI calculation may be notified to the user terminal through a system broadcast message, or may be agreed through a standard protocol.
  • PRACH Index may be included in the RAR format to indicate a PRACH type and/or a PRACH channel.
  • the PRACH index information carried in the field may be any of the following:
  • the “PRACH index” may also be used to indicate different RA (Random Access) preamble formats and/or the code sequences used therein.
  • the PRACH index field may use a reserved field in the RAR message; or the RAR message may adopt a RAR format that includes a PRACH index field; that is, the base station may use a reserved field of the RAR message in the legacy LTE system as the PRACH. Index field. Alternatively, the base station may also use the new RAR format containing the "PRACH Index" field.
  • the reserved bit in the RAR message is used as the RAR format indication information.
  • the system may directly enable the reserved bits in the RAR message to perform new RAR format indication information.
  • the RAR format indication information may also be included in the random access configuration parameter, and is used to indicate a specific format of the subsequent RAR.
  • the RAR format indication information is a format index.
  • one or more RAR formats may be specified in advance by a standard protocol.
  • the RAR format indication information carried by the system broadcast message may include only one format index.
  • Embodiment 2 A control method for random access, as shown in FIG. 2, includes:
  • the base station sends all or part of random access configuration parameters of one or more random access types by using a system broadcast message.
  • the random access configuration parameter includes one or more of the following information: a random access channel type. , random access preamble format, random access channel frame configuration, random access channel subframe configuration, random access wireless network temporary identifier RA-RNTI calculation parameter, random access response RAR window start time, RAR window size, RAR format Indication information;
  • the base station After receiving the random access preamble sent by the user equipment, the base station returns a corresponding random access response RAR message.
  • the random access type includes any one or more of the following:
  • Multi-subcarrier random access single subcarrier random access, random access with different coverage levels.
  • the sending, by the base station, the random access configuration parameters of the one or more random access types by using the system broadcast message includes:
  • the base station transmits random access configuration parameters of random access and single subcarrier random access of each coverage level in a system broadcast message supporting all coverage levels.
  • the RA-RNTI calculation parameter includes:
  • the frame number factor indication being used to indicate whether to use a frame number index as an RA-RNTI calculation factor
  • the frame number calculation parameter being used to indicate a specific calculation of the RA-RNTI
  • the frame number index may be one or more bits in the frame number, or may be a result of the frame number performing a modulo operation on the predetermined constant.
  • the RA-RNTI calculation parameter includes: a frame number mask
  • the result of the AND operation of the frame number mask and the system frame number is used to perform the calculation of the RA-RNTI.
  • the RA-RNTI calculation parameter includes: a frequency index of the PRACH.
  • the frequency index of the PRACH may be, but is not limited to, an index of one or more subcarriers occupied by the PRACH.
  • the RA-RNTI calculation parameter includes:
  • the range indication of the RA-RNTI value of the corresponding random access type includes any one or more of the following: the RA-RNTI start value, the number of subsequent RA-RNTIs, and the subsequent calculation of the RA-RNTI that can be selected. method.
  • the range of the RA-RNTI value may be completely or partially repeated.
  • the range of the RA-RNTI value may not be repeated.
  • the RA-RNTI calculation parameter includes: a PRACH type factor; the PRACH type factor is used to distinguish different types of PRACH.
  • the RAR format includes:
  • a PRACH index field used to indicate a PRACH type and/or a PRACH channel; or a code sequence used to indicate a different random access preamble format and/or a random access preamble.
  • the PRACH index information carried in the PRACH index field may be any one of the following:
  • the base station may use the reserved field in the RAR message to carry the PRACH index field;
  • the RAR message returned by the base station may adopt an RAR format including a PRACH index field.
  • the base station carries RAR format indication information in a reserved bit in the RAR message.
  • the RAR format indication information is a format index.
  • FIG. 3 is a schematic diagram of a signaling procedure of a random access control procedure supporting different random access types according to Embodiment 1; the implementation process includes the following steps 101-107:
  • the base station notifies, by using a system broadcast message, a random access configuration parameter of one or more random access types that the user terminal can use.
  • the random access configuration parameters include the following information: random access channel type, random access preamble format, random access channel frame configuration, random access channel subframe configuration, RA-RNTI calculation parameters, The random access response RAR window start time, RAR window size, RAR format indication information, and the like.
  • the user terminal selects a type of random access for the next step.
  • the user terminal can reasonably select a random access type according to its own capabilities.
  • the user terminal selects a specific PRACH and a random access preamble according to the received random access parameter of the selected random access type.
  • the user terminal sends the selected random access preamble in the selected PRACH.
  • the user equipment determines, according to the RA-RNTI calculation parameter of the selected random access type, the RA-RNTI used by the RAR to receive the RAR, and according to the random access response RAR window start time, RAR window size and other information for RAR monitoring.
  • the base station sends a corresponding RAR message.
  • the user terminal decodes and interprets the RAR message according to the RAR format indication information in the random access configuration parameter of the selected random access type.
  • the base station may define a RAR format that includes a PRACH type index.
  • FIG. 4A and FIG. 4B are schematic diagrams showing a frame number factor used by a base station according to Embodiment 2 to notify a user terminal to calculate an RA-RNTI.
  • the manner adopted in FIG. 4A is to use 1 bit to indicate whether to use the frame number factor for RA-RNTI calculation, and to use the remaining one or more bits to indicate the effective number of bits of the frame number factor used in the RA-RNTI calculation.
  • the valid bit may be the last few bits of the frame number. For example, when the value of the effective number of bits is 3, the last 3 bits of the system frame number are used as the frame number factor for performing the RA-RNTI calculation.
  • the frame number factor is indicated by the frame number mask in FIG. 4B.
  • the frame number factor actually used is the system frame number and the value after the mask is operated and operated. When the frame number mask is all zeros, the frame number factor is not used for RA-RNTI calculation, or the value of the frame number factor is zero.
  • FIG. 5 is a schematic diagram of a range of RA-RNTI values corresponding to a certain PRACH type notified by a base station provided by Embodiment 3 in Embodiment 3.
  • the base station may indicate a starting value of an RA-RNTI and indicate a set of consecutive RA-RNTI values based on the starting value.
  • the number of RA-RNTI values of the group is determined by the number of subsequent RA-RNTIs.
  • the base station may further indicate a calculation method of the RA-RNTI, including each RA-RNTI calculation factor used in the calculation, and a constant multiplied by each RA-RNTI calculation factor.
  • the base station may indicate that the frame number factor n_id is considered in the RA-RNTI calculation of a certain type of PRACH, and the multiplicative constant is k 1 , then the calculation formula used by the user terminal in the RA-RNTI calculation is:
  • RA-RNTI RA-RNTI 0 +k 1 *n_id
  • RA-RNTI 0 is the starting value of the RA-RNTI.
  • the calculation method of the above RA-RNTI can be fixed and pre-agreed through a standard protocol.
  • Implementation Example 4 provides implementation details for multi-type PRACH unified RA-RNTI calculations.
  • the RA-RNTI in addition to the first subframe number t_id and the frequency index f_id of the conventional PRACH, one or more of the following may be added: a PRACH type factor c_id, a frame number factor n_id, a repetition factor r_id .
  • the calculation formula of the RA-RNTI is as follows:
  • RA-RNTI k 0 +k 1 *t_id+k 2 *n_id+k 3 *f_id+k 4 *r_id+k 5 *c_id
  • k 0 to k 5 are predetermined constants, and the specific values may be notified by the base station system to broadcast a message, or may be fixed in advance and agreed by a standard protocol.
  • FIG. 6A and FIG. 6B are schematic diagrams showing a PRACH type indication by using a reserved field in a RAR message of a legacy LTE system according to Embodiment 5.
  • 6A is a format of a RAR unit in a MAC (Media Access Control) layer data packet
  • FIG. 6B is a format of a MAC subheader performing a BI (Backoff Indicator), where E represents an extended MAC address.
  • Subheader, T represents the MAC subheader type. As shown in FIG. 6A and FIG.
  • the reserved bits (T1, T2, T3) in the legacy LTE format can be used to indicate the PRACH type. Since each RAR has a corresponding MAC subheader indicating the RAPID (Random Access Preamble Identity), and there is no redundant reserved bit in the subheader, the reserved bit can only indicate at most two.
  • the PRACH of the type that is, the PRACH type indication is performed with the T1 bit.
  • the PRACH type indication can be performed using the T2 bit or the T3 bit.
  • FIG. 7A and FIG. 7B are a new RAR format adopted by the implementation example 6.
  • 7A is a format of a new RAR unit in a MAC data packet, which uses the "PRACH Index" field in the first byte to indicate the PRACH type or channel.
  • Figure 7B shows the format of the corresponding new BI sub-header for BI, which uses the "PRACH Index" field in the second byte for indication of the PRACH type or channel, where R represents reserved bits.
  • the method can support up to 128 PRACH types or channels.
  • the reserved bit (T1 or T2) in the legacy LTE format may be used to perform an indication of the new RAR format.
  • the RAR format indication information is included in the random access configuration parameter, and is used to indicate a specific format of the subsequent RAR.
  • one or more RAR formats may be specified in advance by a standard protocol.
  • the RAR format indication information carried by the system broadcast message may include only one format index.
  • Embodiment 3 A random access control device is located at a user terminal, as shown in FIG. 8, and includes:
  • the receiving module 81 is configured to receive all or part of random access configuration parameters of one or more random access types from the system broadcast message;
  • the random access configuration parameter includes one or more of the following information: random Access channel type, random access preamble format, random access channel frame configuration, random access channel subframe configuration, random access radio network temporary identifier RA-RNTI calculation parameter, random access response RAR window start time, RAR window Size, RAR format indication information;
  • the selecting module 82 is configured to select a random access type
  • the random access module 83 is configured to perform random access according to the random access configuration parameter of the selected random access type.
  • the random access module is configured to perform random access according to the random access configuration parameter of the selected random access type by using any one or more of the following:
  • the random access module selects a physical random access channel PRACH used by the random access according to the random access channel type, the random access channel frame configuration, and the random access channel subframe configuration;
  • the random access module selects a random access preamble according to the random access preamble format and sends the random access preamble;
  • the random access module performs RAR monitoring according to the random access response RAR window start time and the RAR window size
  • the random access module decodes and interprets the RAR message according to the RAR format indication information.
  • the random access type includes any one or more of the following:
  • Multi-subcarrier random access single subcarrier random access, random access with different coverage levels.
  • the receiving module is configured to receive random access configuration parameters of one or more random access types from the system broadcast message by:
  • the receiving module receives random access configuration parameters of random access and single subcarrier random access of each coverage level from system broadcast messages supporting all coverage levels.
  • the random access channel frame configuration includes a period value, where the period value is used to indicate a configuration period of the PRACH in units of frames.
  • the random access channel frame configuration includes an initial frame index that starts to configure a PRACH, where the initial frame index is used to indicate a system frame that starts a PRACH configuration.
  • the RA-RNTI calculation parameter includes:
  • the frame number factor indication being used to indicate whether to use a frame number index as an RA-RNTI calculation factor
  • the frame number calculation parameter being used to indicate a specific calculation of the RA-RNTI
  • the frame number index may be one or more bits in the frame number, or may be a result of the frame number performing a modulo operation on the predetermined constant.
  • the RA-RNTI calculation parameter includes: a frame number mask
  • the result of the AND operation of the frame number mask and the system frame number is used to perform the calculation of the RA-RNTI.
  • the RA-RNTI calculation parameter includes: a frequency index of the PRACH; the PRACH
  • the frequency index is an index of one or more subcarriers occupied by the PRACH.
  • the RA-RNTI calculation parameter includes:
  • the range indication of the RA-RNTI value of the corresponding random access type includes any one or more of the following: the RA-RNTI start value, the number of subsequent RA-RNTIs, and the subsequent calculation of the RA-RNTI that can be selected. method.
  • the range of the RA-RNTI value may be completely or partially repeated in the random access configuration parameter of the random access of different types or coverage levels; or the range of the RA-RNTI value may not be repeat.
  • the RA-RNTI calculation parameter includes: a PRACH type factor; the PRACH type factor is used to distinguish different types of PRACH.
  • the RAR format includes:
  • a PRACH index field used to indicate a PRACH type and/or a PRACH channel; or a code sequence used to indicate a different random access preamble format and/or a random access preamble.
  • the PRACH index information carried in the PRACH index field may be any one of the following:
  • the PRACH index field may use a reserved field in the RAR message
  • the RAR message may adopt a RAR format including a PRACH index field, that is, a PRACH index field is added in the RAR format.
  • the reserved bit in the RAR message is used as the RAR format indication information.
  • the RAR format indication information is a format index.
  • Embodiment 4 A random access control device is located at a base station, as shown in FIG. 9, and includes:
  • the sending module 91 is configured to send all or part of random access configuration parameters of one or more random access types by using a system broadcast message;
  • the random access configuration parameter includes one or more of the following information: random connection Incoming channel type, random access preamble format, random access channel frame configuration, random access channel subframe configuration, random access radio network temporary identifier RA-RNTI calculation parameter, random access response RAR window start time, RAR window size , RAR format indication information;
  • the feedback module 92 is configured to: after receiving the random access preamble sent by the user terminal, return a corresponding random access response RAR message.
  • the random access type includes:
  • Multi-subcarrier random access single subcarrier random access, random access with different coverage levels.
  • the sending module is configured to send random access configuration parameters of one or more random access types by using a system broadcast message by:
  • the sending module sends a random access configuration parameter of random access and single subcarrier random access of each coverage level in a system broadcast message supporting all coverage levels.
  • the random access channel frame configuration includes a period value, where the period value is used to indicate a configuration period of the PRACH in units of frames.
  • the random access channel frame configuration includes an initial frame index that starts to configure a PRACH, where the initial frame index is used to indicate a system frame that starts a PRACH configuration.
  • the initial frame index may include part or all of the initial frame number.
  • the initial frame index may include an offset time indicating a time from broadcasting the random access channel frame configuration message to actually starting the PRACH frame configuration.
  • the offset time may be indicated in units of a system frame length or a subframe length.
  • the RA-RNTI calculation parameter includes:
  • the frame number factor indication being used to indicate whether to use a frame number index as an RA-RNTI calculation factor
  • the frame number calculation parameter being used to indicate a specific calculation of the RA-RNTI
  • the frame number index may be one or more bits in the frame number, or may be a result of the frame number performing a modulo operation on the predetermined constant.
  • the RA-RNTI calculation parameter includes: a frame number mask
  • the result of the AND operation of the frame number mask and the system frame number is used to perform the calculation of the RA-RNTI.
  • the RA-RNTI calculation parameter includes: a frequency index of the PRACH; and the frequency index of the PRACH is an index of one or more subcarriers occupied by the PRACH.
  • the RA-RNTI calculation parameter includes:
  • the range indication of the RA-RNTI value of the corresponding random access type includes any one or more of the following: the RA-RNTI start value, the number of subsequent RA-RNTIs, and the subsequent calculation of the RA-RNTI that can be selected. method.
  • the range of the RA-RNTI value may be completely or partially repeated, or may not be repeated.
  • the RA-RNTI calculation parameter includes: a PRACH type factor; the PRACH type factor is used to distinguish different types of PRACH.
  • the RAR format includes:
  • a PRACH index field used to indicate a PRACH type and/or a PRACH channel; or a code sequence used to indicate a different random access preamble format and/or a random access preamble.
  • the PRACH index information carried in the PRACH index field may be any one of the following:
  • the base station uses the reserved field in the RAR message to carry the PRACH index field;
  • the RAR message returned by the base station adopts a RAR format including a PRACH index field.
  • the base station carries RAR format indication information in a reserved bit in the RAR message.
  • the RAR format indication information is a format index.
  • an embodiment of the present invention further provides a computer storage medium, wherein a computer program is stored, and the computer program is used to execute the implementation method provided by the present invention.
  • the modules of the present invention may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions.
  • a computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the method of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a ROM (Read-Only Memory), a RAM (Random Access Memory), a disk or an optical disk, and the like, which can store program codes. .
  • embodiments of the invention are not limited to any specific combination of hardware and software.
  • the foregoing technical solution is applicable to the NB-IoT system, and can support single-subcarrier random access, multi-subcarrier random access, and support for identification of a random access channel in a wider range.
  • the foregoing technical solution provides a flexible RA-RNTI calculation method, and different types or coverage levels of PRACH can use different ranges of RA-RNTI values and reuse the same range of RA-RNTI values.
  • the foregoing technical solution provides RAR format indication information, and can support RARs of different formats.
  • the user terminals transmitting the random access preamble on different PRACH types or different PRACHs can be demodulated using the same RA-RNTI, thereby simplifying the RA-RNTI related processing.

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

Abstract

La présente invention concerne un procédé et un appareil de commande d'accès aléatoire. Le procédé comprend : la réception par un terminal utilisateur, en provenance d'un message de diffusion de système, de tout ou partie d'un ensemble de paramètres de configuration d'accès aléatoire d'un ou plusieurs types d'accès aléatoire, les paramètres de configuration d'accès aléatoire comprenant une ou plusieurs informations parmi les informations suivantes : un type de canal d'accès aléatoire, un format de préambule d'accès aléatoire, une configuration de trame de canal d'accès aléatoire, une configuration de sous-trame de canal d'accès aléatoire, un paramètre de calcul d'identifiant temporaire de réseau radioélectrique d'accès aléatoire (RA-RNTI), un temps de départ de fenêtre de réponse d'accès aléatoire (RAR), une taille de fenêtre de RAR ou des informations d'indication de format de RAR ; la sélection par le terminal d'utilisateur d'un type d'accès aléatoire ; l'exécution par le terminal d'utilisateur d'un accès aléatoire conformément à un paramètre de configuration d'accès aléatoire du type d'accès aléatoire sélectionné.
PCT/CN2016/104592 2016-01-05 2016-11-04 Procédé et appareil de commande d'accès aléatoire WO2017118197A1 (fr)

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