WO2018227493A1 - Procédé d'accès aléatoire et dispositif associé - Google Patents

Procédé d'accès aléatoire et dispositif associé Download PDF

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Publication number
WO2018227493A1
WO2018227493A1 PCT/CN2017/088499 CN2017088499W WO2018227493A1 WO 2018227493 A1 WO2018227493 A1 WO 2018227493A1 CN 2017088499 W CN2017088499 W CN 2017088499W WO 2018227493 A1 WO2018227493 A1 WO 2018227493A1
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Prior art keywords
band
sub
subband
random access
information
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PCT/CN2017/088499
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English (en)
Chinese (zh)
Inventor
刘云
王键
王达
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201780061835.XA priority Critical patent/CN109845168B/zh
Priority to PCT/CN2017/088499 priority patent/WO2018227493A1/fr
Publication of WO2018227493A1 publication Critical patent/WO2018227493A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • the present application relates to the field of wireless communications, and in particular, to a random access method and related devices.
  • Random access is a very important process in a mobile communication system. It is the last step in establishing a communication link between a terminal device and a base station.
  • the random access procedure refers to starting a random access preamble from a user and attempting to access the network to the network. The process before establishing a basic signaling connection.
  • the terminal device performs random access through a random access channel (RACH).
  • RACH random access channel
  • a base station and a terminal device can support a maximum bandwidth of 20 MHz, one RACH in one frequency band, and the largest supported by a base station in a new radio (NR) system.
  • the bandwidth of the band can reach 80MHZ or even 160MHZ, and the maximum bandwidth of the terminal equipment that can be supported by the cost limit and process limitation is still 20MHZ. Therefore, the terminal device can only work on a part of the frequency band of the base station, that is, the terminal device and the base station transmit on a sub-band of the base station.
  • the following situation occurs: a part of the sub-band of the base station accesses a large number of terminal devices and remains in the In the busy state, the terminal device is not connected to the other sub-band and is always in an idle state, and the load between the sub-bands is unbalanced.
  • the present application provides a random access method and related apparatus, which can adjust a sub-band of communication between a base station and a terminal device in time, and maintain load balancing of the sub-band.
  • the present application provides a random access method, which may be applied to a terminal device side or a network device side, including: the first device sends a first indication message to the second device, where the first indication message carries the target sub- The sub-band corresponding to the frequency band indicates that the first indication message is used to indicate that the second device receives the signal sent by the first device or sends a signal to the first device in the target sub-band; the first device is in the target sub-band
  • the second device transmits a signal or receives a signal transmitted by the second device.
  • the first device may be a terminal device
  • the second device may be a network device
  • the second device may also be a network device
  • the second device may also be a terminal device.
  • the first device sends a first indication message to the second device, where the first indication message carries a sub-band indication corresponding to the target sub-band, so that the second device switches or accesses to the target sub-band and the
  • the sub-bands for communication between the first device and the second device can be adjusted in time to implement load balancing between the sub-bands.
  • the first indication message may be a random access response; the first indication message may also be a contention resolution response; the first indication message may also be a downlink control command; the first indication message may also be a device identifier.
  • the message is reported; the first indication message may also report the message for the preamble sequence.
  • the first indication message may be a message in a contention-based random access scenario, a message in a non-contention based random access scenario, or a message based on a fast random access scenario.
  • the target sub-band may be a sub-band of the plurality of sub-bands
  • the method further includes: receiving, by the first device, the first information sent by the second device, The first information
  • a preamble sequence corresponding to each of the plurality of subbands is included.
  • the preamble sequence corresponding to each sub-band may be a preamble sequence group corresponding to each sub-band, that is, a set of multiple preamble sequences, or may be a range of preamble sequence numbers corresponding to each sub-band, that is, a set of numbers of multiple preamble sequences. .
  • the first indication message is further used to indicate that the target sub-band is a working device of the first device.
  • the frequency band, that is, the target sub-band is the working sub-band of the terminal device.
  • the target sub-band is a sub-band of the plurality of sub-bands
  • the method further includes: receiving, by the first device, the second information sent by the second device, where The second information includes subband information of the plurality of subbands.
  • the sub-band information may be at least one of a bandwidth, a frequency domain location, a frequency domain range, or a channel load parameter.
  • the channel load parameter may be the access probability of the sub-band; the channel load parameter may also be the load indication of the sub-band; the channel load parameter may also be the access probability of the random access channel corresponding to the sub-band.
  • the channel load parameter may also be a load indication of the random access channel corresponding to the sub-band.
  • the channel load parameter may be a ratio of the number of first devices currently accessed by the sub-band to the number of first devices allowed to access the sub-band; the channel load parameter may also be the current sub-band The ratio of the number of the first devices that are accessed to the number of the first devices that the second device allows access; the channel load parameter may also be the duty cycle of the sub-band over a predetermined period of time; the channel load parameter is also The ratio of the duty ratio of the sub-band over a predetermined period of time in the past to the sub-band having the largest duty ratio in the past predetermined period of time; the channel load parameter may also be weighted by the above values The value obtained after the calculation; the channel load parameter may also be a sequence number obtained by sorting or the like according to the above several values.
  • the target sub-band is a sub-band of the plurality of sub-bands
  • the method further includes: receiving, by the first device, the third information sent by the second device, where The third information includes the channel indication information of the random access channel of the multiple sub-bands; the first device sends the first indication message to the second device, where the first device sends the second access channel corresponding to the target sub-band to the second
  • the device sends a first indication message.
  • the number of the random access channels corresponding to the target sub-band may be one or more. When there are multiple random access channels corresponding to the target sub-band, the first device may send the first device to the second device on any random access channel. An indication message.
  • the channel indication information includes a starting frequency domain location or a frequency domain coverage.
  • the sub-band indication includes a sub-band identification, a frequency domain coverage, or a preamble sequence.
  • the subband indication may be a preamble sequence; in a case where the first indication message is a contention resolution response, a downlink control command, a random access response, or a device identifier reporting message, the sub The band indication can be a sub-band identification or a frequency domain coverage.
  • the application provides a device, where the device has the function of implementing the first device in the first aspect, and the function may be implemented by using hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the device includes a sending unit, configured to send a first indication message to the second device, where the first indication message carries a sub-band indication corresponding to the target sub-band, the first indication message And configured to instruct the second device to receive a signal sent by the device or send a signal to the device in the target sub-band; the sending unit further And a receiving unit, configured to receive, by the target sub-band, a signal sent by the second device in the target sub-band.
  • the device includes a processor and a transceiver, the processor is configured to instruct the transceiver to receive or send data, and the transceiver is configured to send a first indication to the second device. a message indicating that the first indication message carries a sub-band indication corresponding to the target sub-band, where the first indication message is used to indicate that the second device receives the signal sent by the device in the target sub-band or The device sends a signal; the transceiver is further configured to send a signal to the second device in the target sub-band or receive a signal sent by the second device.
  • the principle and the beneficial effects of the device for solving the problem can be referred to the method and the beneficial effects of the first aspect.
  • the implementation of the device refer to the implementation of the method in the first aspect, and repeat I won't go into details here.
  • the present application provides a random access method, which is applied to a network device side or a terminal device side, and includes: the second device receives a first indication message sent by the first device, where the first indication message carries the target sub a sub-band indication corresponding to the frequency band; the second device receives the signal sent by the first device or sends a signal to the first device in the target sub-band.
  • the second device communicates with the first device on the target sub-band according to the sub-band indication in the first indication message, and can adjust the sub-band between the first device and the second device in time to implement the sub-band Load balancing between.
  • the first indication message may be a random access response; the first indication message may also be a contention resolution response; the first indication message may also be a downlink control command; the first indication message may also be The device identifier reports the message; the first indication message may also be a preamble sequence reporting message.
  • the first indication message may be a message in a contention-based random access scenario, a message in a non-contention based random access scenario, or a message based on a fast random access scenario.
  • the target sub-band may be a sub-band of the plurality of sub-bands
  • the method further includes: the second device sending the first information to the first device,
  • the first information includes a preamble sequence corresponding to each of the plurality of subbands.
  • the preamble sequence corresponding to each sub-band may be a preamble sequence group corresponding to each sub-band, that is, a set of multiple preamble sequences, or may be a range of preamble sequence numbers corresponding to each sub-band, that is, a set of numbers of multiple preamble sequences. .
  • the first indication message is further used to indicate that the target sub-band is a working sub-band of the first device, That is, the target sub-band is the working sub-band of the terminal device.
  • the target sub-band is a sub-band of the plurality of sub-bands
  • the second device before receiving the first indication message sent by the first device, further includes: the second device sending the second information to the first device, where The second information includes sub-band information of each of the plurality of sub-bands.
  • the sub-band information may be at least one of a bandwidth, a frequency domain location, a frequency domain range, or a channel load parameter.
  • the channel load parameter may be the access probability of the sub-band; the channel load parameter may also be the load indication of the sub-band; the channel load parameter may also be the access probability of the random access channel corresponding to the sub-band.
  • the channel load parameter may also be a load indication of the random access channel corresponding to the sub-band.
  • the channel load parameter may be a ratio of the number of first devices currently accessed by the sub-band to the number of first devices allowed to access the sub-band; the channel load parameter may also be the current sub-band The ratio of the number of the first devices that are accessed to the number of the first devices that the second device allows access; the channel load parameter may also be the duty cycle of the sub-band over a predetermined period of time; the channel load parameter is also The ratio of the duty ratio of the sub-band over a predetermined period of time in the past to the sub-band having the largest duty ratio in the past predetermined period of time; the channel load parameter may also be weighted by the above values The value obtained after the calculation; the channel load parameter may also be a sequence number obtained by sorting or the like according to the above several values.
  • the target sub-band is a sub-band of the plurality of sub-bands
  • the second device before receiving the first indication information sent by the first device, further includes: the second device sending the third information to the first device, where The third information includes the channel indication information of the random access channel of the multiple sub-bands; the receiving, by the second device, the first indication message sent by the first device includes: receiving, by the second device, the random access channel corresponding to the target sub-band A first indication message sent by a device.
  • the channel indication information includes a starting frequency domain location or a frequency domain coverage.
  • the sub-band indication includes a sub-band identification, a frequency domain coverage, or a preamble sequence.
  • the subband indication may be a preamble sequence; in a case where the first indication message is a contention resolution response, a downlink control command, a random access response, or a device identifier reporting message, the sub The band indication can be a sub-band identification or a frequency domain coverage.
  • the application provides a device, where the device has the function of implementing the second device in the third aspect, and the function may be implemented by using hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the device includes a receiving unit, configured to receive a first indication message sent by the first device, where the first indication message carries a subband indication corresponding to the target subband; the receiving unit further And a sending unit, configured to send a signal to the first device in the target sub-band.
  • the device includes a processor and a transceiver, the processor is configured to instruct the transceiver to receive or send data, and the transceiver is configured to receive the first sent by the first device. And an indication message, where the first indication message carries a sub-band indication corresponding to the target sub-band; the transceiver is further configured to receive a signal sent by the first device or send a signal to the first device in the target sub-band.
  • the principle and the beneficial effects of the device for solving the problem can be referred to the method described in the third aspect and the beneficial effects.
  • the implementation of the device can refer to the implementation of the method in the third aspect, and the method is repeated. I won't go into details here.
  • the present application provides a random access method, which is applied to a network device side, and includes: the network device sends fourth information to the terminal device, where the fourth information includes subband information of at least one subband, at least one sub a channel indicating information corresponding to a preamble sequence of each subband or a random access channel of at least one subband; the network device intercepts the terminal device on a random access channel corresponding to each subband of the at least one subband A random access request sent.
  • the fourth information may be the first information, the second information, or the third information of the first aspect or the third aspect.
  • the network device may send various information of multiple sub-bands to the terminal device, so that the terminal device can access in a suitable sub-band.
  • the channel load parameter may be the access probability of the sub-band; the channel load parameter may also be the load indication of the sub-band; the channel load parameter may also be the access probability of the random access channel corresponding to the sub-band.
  • the channel load parameter may also be a load indication of the random access channel corresponding to the sub-band.
  • the channel load parameter may be a ratio of the number of terminal devices currently accessed by the sub-band to the number of terminal devices allowed to access the sub-band; the channel load parameter may also be the current access of the sub-band.
  • the ratio of the number of terminal devices to the number of terminal devices allowed to be accessed by the network device; the channel load parameter may also be the duty cycle of the sub-band over a predetermined period of time in the past; the channel load parameter may also be a sub-band at The ratio of the duty ratio in the past period of time to the sub-band with the largest duty ratio in the past predetermined period of time; the channel load parameter can also be weighted by the above numerical values.
  • the channel load parameter may also be a sequence number obtained by sorting the above several values.
  • the channel indication information includes a starting frequency domain location or a frequency domain coverage.
  • the preamble sequence corresponding to each sub-band may be a preamble sequence group corresponding to each sub-band, that is, a set of multiple preamble sequences; or may be a range of preamble sequence numbers corresponding to each sub-band, that is, multiple A collection of numbers of leading sequences.
  • the application provides a network device, where the device has the function of implementing the network device in the fifth aspect, and the function may be implemented by using hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the device includes a sending unit, configured to send fourth information to the terminal device, where the fourth information includes subband information of at least one subband, and each subband corresponding to the at least one subband a preamble sequence or channel indication information of a random access channel of at least one sub-band; a receiving unit, configured to listen to a random connection sent by the terminal device on a random access channel corresponding to each sub-band of the at least one sub-band Into the request.
  • the device includes a processor and a transceiver, the processor is configured to instruct the transceiver to receive or send data, and the transceiver is configured to send fourth information to the terminal device,
  • the fourth information includes subband information of at least one subband, a preamble sequence corresponding to each subband in at least one subband, or channel indication information of a random access channel of at least one subband; the transceiver is further used And receiving a random access request sent by the terminal device on a random access channel corresponding to each subband in the at least one subband.
  • the principle and the beneficial effects of the network device for solving the problem can be referred to the method and the beneficial effects of the fifth aspect.
  • the implementation of the device can be implemented by referring to the implementation of the method in the fifth aspect. It will not be repeated here.
  • the present application provides a random access method, which is applied to a terminal device side, and includes: receiving, by a terminal device, fourth information sent by a network device, where the fourth information includes subband information of at least one subband, at least one Channel indication information of a preamble sequence corresponding to each subband in a subband or a random access channel of at least one subband; the terminal device accesses a target subband, wherein the target subband is in the at least one subband Subband.
  • the terminal device may access from a plurality of sub-bands in a suitable sub-band according to various information of multiple sub-bands transmitted by the network device.
  • the fourth information may be the first information, the second information, or the third information of the first aspect or the third aspect.
  • the channel load parameter may be the access probability of the sub-band; the channel load parameter may also be the load indication of the sub-band; the channel load parameter may also be the access probability of the random access channel corresponding to the sub-band.
  • Letter The track load parameter may also be a load indication of a random access channel corresponding to the sub-band.
  • the channel load parameter may be a ratio of the number of terminal devices currently accessed by the sub-band to the number of terminal devices allowed to access the sub-band; the channel load parameter may also be the current access of the sub-band.
  • the value of the channel load parameter may also be a sequence number obtained by sorting the above several values.
  • the channel indication information includes a starting frequency domain location or a frequency domain coverage.
  • the preamble sequence corresponding to each sub-band may be a preamble sequence group corresponding to each sub-band, that is, a set of multiple preamble sequences; or may be a range of preamble sequence numbers corresponding to each sub-band, that is, multiple A collection of numbers of leading sequences.
  • the terminal device accessing the target sub-band includes: the terminal device performs random access on the random access channel corresponding to the target sub-band. In an implementation manner, if there are multiple random access channels corresponding to the target sub-band, the terminal device may perform random access on any one of the random access channels.
  • the random access of the terminal device to the random access channel corresponding to the target sub-band includes:
  • the terminal device sends a random access request to the network device in the random access channel corresponding to the target sub-band.
  • the application provides a terminal device, where the device has the function of implementing the terminal device in the seventh aspect, and the function may be implemented by using hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the terminal device includes a receiving unit, configured to receive fourth information sent by the network device, where the fourth information includes sub-band information of at least one sub-band, each sub-band in the at least one sub-band a channel corresponding information of a preamble sequence corresponding to a frequency band or a random access channel of at least one subband; and a processing unit, configured to access a target subband, wherein the target subband is a subband in the at least one subband.
  • the device includes a processor and a transceiver, the processor is configured to instruct the transceiver to receive or send data, and the transceiver is configured to receive fourth information sent by the network device.
  • the fourth information includes subband information of at least one subband, a preamble sequence corresponding to each subband in at least one subband, or channel indication information of a random access channel of at least one subband; the processor, further And a method for accessing a target sub-band through the transceiver, wherein the target sub-band is a sub-band in the at least one sub-band.
  • the principle and the beneficial effects of the device for solving the problem can be referred to the method and the beneficial effects of the seventh aspect.
  • the implementation of the terminal device can be implemented by referring to the implementation of the method in the seventh aspect. It will not be repeated here.
  • the present application provides a computer storage medium for storing computer program instructions for use in a computer, comprising the program for performing the above first aspect.
  • the application provides a computer storage medium for storing computer program instructions for use in a computer, comprising the program for performing the third aspect described above.
  • the present application provides a computer storage medium for storing computer program instructions for use in a computer, comprising the program for performing the fifth aspect described above.
  • the present application provides a computer storage medium for storing computer program instructions for use in a computer, comprising the program for performing the seventh aspect described above.
  • the present application provides a computer program for performing the various methods provided by the first aspect above.
  • the present application provides a computer program for performing the various methods provided by the third aspect above.
  • the present application provides a computer program for performing the various methods provided by the fifth aspect above.
  • the present application provides a computer program for performing the various methods provided by the seventh aspect above.
  • FIG. 1 is a structural diagram of a wireless communication system provided by the present application.
  • FIG. 2 is a schematic diagram of a contention-based random access procedure
  • FIG. 3 is a schematic diagram of a non-contention based random access procedure
  • FIG. 4 is a schematic diagram of a process based on fast random access
  • FIG. 5a is a schematic diagram of a correspondence between a RACH and a sub-band and a sub-band division provided by the present application;
  • FIG. 5b is a schematic diagram of another RACH and sub-band correspondence and sub-band division provided by the present application.
  • FIG. 6a is a schematic diagram of another RACH and sub-band correspondence and sub-band division provided by the present application.
  • 6b is a schematic diagram of still another correspondence between RACH and subband and subband division provided by the present application.
  • FIG. 7a is a schematic diagram of still another correspondence between RACH and subband and subband division provided by the present application.
  • FIG. 7b is a schematic diagram of still another correspondence between RACH and sub-band and sub-band division provided by the present application.
  • FIG. 8 is a schematic flowchart of a random access method according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic flowchart diagram of another random access method according to an embodiment of the present application.
  • FIG. 10a is a schematic diagram of comparison of a sub-band variation provided by the present application.
  • FIG. 10b is a schematic diagram of comparison of another seed band variation provided by the present application.
  • FIG. 10c is a schematic diagram of comparison of changes in yet another seed band provided by the present application.
  • FIG. 11 is a schematic diagram of comparison of changes in yet another seed band provided by the present application.
  • 12a is a schematic diagram of comparison of another seed band variation provided by the present application.
  • Figure 12b is a schematic diagram showing a comparison of changes in yet another seed band provided by the present application.
  • 13a is a schematic diagram of comparison of another seed band variation provided by the present application.
  • Figure 13b is a schematic diagram showing a comparison of changes in yet another seed band provided by the present application.
  • 13c is a schematic diagram of comparison of changes in yet another seed band provided by the present application.
  • 14a is a schematic diagram of comparison of changes in yet another seed band provided by the present application.
  • 14b is a schematic diagram of a comparison of changes in yet another seed band provided by the present application.
  • 15 is a schematic structural diagram of a system composed of a first device and a second device according to an embodiment of the present application;
  • 16 is a schematic structural diagram of a system composed of a first device and a second device according to an embodiment of the present application;
  • FIG. 17 is a schematic structural diagram of hardware of a network device according to an embodiment of the present disclosure.
  • FIG. 18 is a structural block diagram of an implementation manner of a terminal device according to an embodiment of the present application.
  • the embodiment of the present application can be applied to a wireless communication system in which a terminal device is different from a maximum bandwidth supported by a base station or has multiple sub-bands.
  • the wireless communication system usually consists of a cell, and each cell includes a base station (BS), and the base station A plurality of terminal devices provide communication services, wherein the base stations are connected to the core network devices, as shown in FIG.
  • the base station includes a baseband unit (BBU) and a remote radio unit (RRU).
  • BBU and the RRU can be placed in different places, for example, the RRU is pulled away, placed in an open area from high traffic, and the BBU is placed in the central computer room.
  • BBUs and RRUs can also be placed in the same room.
  • the BBU and RRU can also be different parts under one rack.
  • the wireless communication system mentioned in the embodiments of the present application includes, but is not limited to, a narrow band-internet of things (NB-IoT), and a global system for mobile communications (GSM).
  • GSM global system for mobile communications
  • EDGE Enhanced data rate for GSM evolution
  • WCDMA wideband code division multiple access
  • CDMA2000 code division multiple access
  • TD-SCDMA Time division-synchronization code division multiple access
  • LTE Long Term Evolution
  • 5G system Fifth Generation
  • future mobile communication system future mobile communication system.
  • the base station is a device deployed in a radio access network to provide a wireless communication function for the terminal device.
  • the base station may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, transmission access point (TRP), and the like.
  • the names of devices with base station functions may vary, for example, in a 5G system, called a generation Node B (gNB), in an alternative.
  • gNB generation Node B
  • evolved NodeB evolved NodeB
  • NB Node B
  • 3G third-generation
  • the terminal devices involved in the embodiments of the present application may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to the wireless modem.
  • the terminal device may also be referred to as a mobile station (MS), a terminal, and may also include a subscriber unit, a cellular phone, a smart phone, a wireless data card, and an individual.
  • MTC machine type communication
  • FIG. 2 is a schematic diagram of a contention-based random access procedure.
  • step S101 the terminal device sends a preamble sequence reporting message Msg1 to the network device, where the preamble sequence reporting message Msg1 carries the preamble sequence.
  • the terminal device monitors the broadcast message sent by the network device and acquires the RACH and the physical random access channel (physical random access channel) on the physical downlink control channel (PDCCH).
  • the configuration parameters of the PRACH include the preamble sequence resources, the time-frequency resources, the power resources, and the like
  • the random access request is initiated to the network device.
  • the terminal device After determining the preamble sequence and the related time-frequency resource and the power resource, the terminal device sends a preamble sequence reporting message Msg1 carrying the preamble sequence to the network device on the RACH.
  • Step S102 The network device sends a random access response (RAR) Msg2 to the terminal device.
  • RAR random access response
  • the network device After the network device receives and correctly decodes the preamble sequence sent by the terminal device, the network device sends a random access response Msg2 to the terminal device.
  • Step S103 The terminal device sends a device identifier report message Msg3 to the network device, where the device identifier report message Msg3 carries the device identifier of the terminal device.
  • the terminal device After transmitting the preamble sequence reporting message to the network device, the terminal device monitors the PDCCH in the time window of the random access feedback to receive the random access response Msg2 sent by the network device; the terminal device receives the time window of the random access feedback. After the random access response Msg2, the uplink time synchronization and uplink resources are obtained, but the terminal device does not determine whether the random access response Msg2 is sent by the network device to the terminal device, and is not sure of the currently selected resource (the resource here) Whether the preamble sequence resource and the time-frequency resource are also selected by other terminal devices, the terminal device sends the device identity report message Msg3 to the network device, so that the network device determines the identity of the terminal device.
  • Step S104 The network device sends a contention resolution Msg4 to the terminal device.
  • multiple terminal devices may use the same preamble sequence and time-frequency resources for random access. When these devices use the same preamble sequence and time-frequency resources for random access, the same resources are used.
  • the device identifier report message Msg3 sent by the terminal device conflicts with each other. In this case, the network device may only receive and correctly decode the device identifier report message Msg3 sent by one or several devices, and the device identifier report message Msg3 corresponding to the received device is successfully received.
  • the terminal device sends a contention resolution response Msg4 to the part of the terminal device to inform the terminal device that the contention is successful.
  • the terminal device After receiving the contention resolution response Msg4, the terminal device determines that the contention-based random access is successful.
  • FIG. 3 is a schematic diagram of a non-contention based random access procedure.
  • step S201 the terminal device sends a preamble sequence reporting message Msg1 to the network device, where the preamble sequence reporting message Msg1 carries the preamble sequence.
  • the network device may allocate a preamble sequence and a specific time-frequency resource to the terminal device for random access in advance; after receiving the preamble sequence, the terminal device sends the network device to the corresponding time-frequency resource.
  • the preamble sequence is sent to report the message Msg1.
  • Step S201 The network device sends a random access response Msg2 to the terminal device.
  • the terminal device After the network device correctly receives the preamble sequence sent by the terminal device, the terminal device sends a random access response Msg2.
  • the listener listens to the time window of the random access feedback.
  • the downlink control channel (PDCCH) is received to receive the random access response Msg2 sent by the network device; when the terminal device receives the random access response Msg2 in the time window of the random access feedback, the uplink is obtained.
  • the terminal device determines that the random access response Msg2 is sent by the network device to the terminal device, that is, determining that the local device is based on non-competition The random access was successful.
  • steps S201 to S202 the process of performing random access by the terminal device based on the non-contention manner is completed.
  • the terminal device loses uplink synchronization, and the network device triggers the base station device to perform random access again.
  • the network device After the terminal device and the network device are out of synchronization, the network device sends a downlink control command PDCCH order to the terminal device to notify the base station to perform random access again. After receiving the downlink control command PDCCH order, the base station re-initiates the random access process. See the description of the first or second random access scenario above.
  • FIG. 4 is a schematic diagram of a process based on fast random access.
  • step S301 the terminal device sends a preamble sequence reporting message Msg1 to the network device, where the preamble sequence reporting message Msg1 carries the preamble sequence.
  • Step S302 The terminal device sends a device identifier report message Msg3 to the network device, where the device identifier report message Msg3 carries the device identifier of the terminal device.
  • the terminal device After transmitting the preamble sequence reporting message Msg1, the terminal device immediately sends a device identity report message Msg3 to the network device to indicate its identity. As long as the random access response Msg2 sent by the network device is received, the terminal device can determine the random connection. The incoming response Msg2 is sent by the network device to itself, and further determines that the access is successful and saves time.
  • the preamble sequence reporting message Msg1 and the device identifier reporting message Msg3 may be consecutive messages transmitted in the time domain, or may be messages that are discontinuously transmitted in the time domain.
  • the terminal monitors the physical downlink control channel (PDCCH) in the time window of the random access feedback to receive the random access response Msg2 sent by the network device.
  • PDCCH physical downlink control channel
  • Step S303 the network device sends a random access response (RAR) Msg2 to the terminal device.
  • RAR random access response
  • the network device After successfully receiving the preamble sequence reporting message Msg1 and the identifier reporting message Msg3 sent by the terminal device, the network device sends a random access response Msg2 identifier to the terminal device to indicate that the terminal device access is successful.
  • the terminal device completes based on the process of fast random access.
  • the bandwidth of the base station is wider and can support more terminal equipment access, and the terminal can perform random access and work on part of the frequency band of the NR system according to communication requirements.
  • the frequency band can be divided into multiple sub-bands. The following describes the partitioning scheme of several sub-bands of the present application and the corresponding scheme of the sub-band and the RACH.
  • the number of RACHs is the same as the number of subbands, and the relationship between the RACH and the subbands is one-to-one.
  • the sub-bands of the NR system are divided into A sub-bands having the same frequency-domain width, A is a positive integer greater than or equal to 1, and each sub-band in the A sub-bands does not coincide with each other, and each sub-band Both contain a RACH.
  • FIG. 5a is a schematic diagram of a correspondence between RACH and sub-band and sub-band division provided by the present application.
  • the frequency band of the NR system is equally divided into four sub-bands, which are sub-band 1, sub-band 2, sub-band 3, and sub-band 4, and each sub-band does not overlap with each other, and each sub-band includes A RACH.
  • the subband of the NR system is divided into B subbands having different frequency domain widths, B is a positive integer greater than or equal to 1, and subbands of the B subbands do not coincide with each other, and each subband is in each subband.
  • FIG. 5b is a schematic diagram of another RACH and sub-band correspondence and sub-band division provided by the present application.
  • the NR system is divided into four sub-bands having different frequency domain widths, which are sub-band 1, sub-band 2, sub-band 3, and sub-band 4, and each sub-band does not coincide with each other, and each sub-band Both contain a RACH.
  • the sub-band of the NR system may be equally divided into C sub-bands, C being a positive integer greater than or equal to 1, and each sub-band of the C sub-bands does not coincide with each other, wherein only one sub-band contains one RACH.
  • FIG. 6a is a schematic diagram of another RACH and sub-band correspondence and sub-band division provided by the present application.
  • the frequency band of the NR system is divided into four frequency bands, respectively.
  • subband 1, subband 2, subband 3, and subband 4 each subband does not coincide with each other, wherein the frequency domain of the RACH is within the frequency domain of subband 1.
  • there are D sub-bands of frequency domain width in the frequency band of the NR system, wherein the sub-bands whose frequency domain width is Fi (i 1, 2, . . . , D) have M/Fi M is the frequency domain width of the entire frequency band, and the sub-bands whose frequency domain width is Fi do not coincide with each other, wherein only one sub-band of the same frequency-domain width sub-band includes the RACH.
  • FIG. 6b is a schematic diagram of still another RACH and sub-band correspondence relationship and sub-band division provided by the present application.
  • the frequency band of the NR system is divided into seven sub-bands, respectively. It is subband 1, subband 2, subband 3, subband 4, subband 5, subband 6, and subband 7.
  • the relationship between the RACH and the sub-band is a many-to-many relationship, and the relationship between the RACH and the sub-band satisfies the sub-band of the frequency domain in which the frequency domain covers the RACH.
  • the RACH is corresponding to the RACH, if the frequency domain of a sub-band covers the frequency domain in which the RACH is located, the RACH is the RACH in the sub-band, and the RACH is corresponding to the sub-band, and the RACH can be used to access the sub-band.
  • the frequency domain width is Fj subbands that do not coincide with each other.
  • the number of RACHs is equal to the number of subbands with the smallest frequency domain width. If the frequency domain width F1 is the smallest, each subband of the frequency domain width F1 includes one RACH. If the frequency domain is large The frequency domain of the sub-band of F1 covers the frequency domain in which the RACH is located, and the RACH is also included in the sub-bands whose frequency domain width is greater than F1, and the RACH can be used to access the sub-bands whose frequency domain width is greater than F1.
  • a sub-band having a domain width greater than F1 may include at least one RACH.
  • FIG. 7a is a schematic diagram of still another RACH and sub-band correspondence relationship and sub-band division provided by the present application.
  • the frequency band of the NR system is divided into seven sub-bands, respectively. It is subband 1, subband 2, subband 3, subband 4, subband 5, subband 6, and subband 7.
  • the sub-band with the frequency domain width F1 that is, the sub-band 1, the sub-band 2, the sub-band 3, and the sub-band 4 all include one RACH; and the sub-band with the frequency domain width greater than F1 includes multiple RACHs, that is, the sub-band 5
  • the subband 6 contains two RACHs, and the subband 7 contains four RACHs.
  • the number of RACHs is smaller than the number of sub-bands whose frequency domain width is Fj, that is, only a part of the sub-bands whose frequency domain width is Fj includes RACH. If the frequency domain of the sub-band with the frequency domain width greater than Fj covers the frequency domain in which the RACH is located, the RACH is also included in the sub-bands whose frequency domain width is greater than F1, and the RACH can be used to access the frequency domain width greater than Fj.
  • the subband, the subband having a frequency domain width greater than Fj may include at least one RACH.
  • FIG. 7b is a schematic diagram of still another correspondence between RACH and sub-band and sub-band division provided by the present application.
  • the frequency band of the NR system is divided into 7
  • the sub-bands are sub-band 1, sub-band 2, sub-band 3, sub-band 4, sub-band 5, sub-band 6, and sub-band 7.
  • sub-band 1 and sub-band 3 comprise RACH; in the sub-band with frequency domain width F2, sub-band 5 and sub-band 6 both comprise RACH, and sub-band 7 includes two RACH.
  • the frequency band has other division manners, for example, sub-bands with the same frequency domain width may also partially overlap; There are other correspondences between the correspondence between RACH and subbands.
  • FIG. 8 is a schematic flowchart of a random access method according to an embodiment of the present application.
  • the application is applicable to the foregoing first solution for subband division and subband and RACH. As shown, the method includes:
  • Step S401 The network device sends fourth information to the terminal device, where the terminal device receives the fourth information, where the fourth information includes subband information of the at least one subband, a preamble sequence corresponding to each subband in the at least one subband, or at least Channel indication information for a random access channel of one sub-band.
  • the fourth information may be broadcast information, and the fourth information may be carried in a master information block (MIB), a system information block (SIB), and sent to the terminal device; further, the SIB It can be SIB1 or SIB2.
  • MIB master information block
  • SIB system information block
  • the sub-band information may include one or more of bandwidth, frequency domain location, frequency domain range, and channel load parameters.
  • the channel load parameter may be used to indicate the busyness of the sub-band, and may also be used to characterize the success rate of the terminal device accessing the sub-band through the RACH on the sub-band.
  • the channel load parameter may be an access probability of the sub-band, or may be an access probability of the RACH corresponding to the sub-band, or may be a load indication of the sub-band, or may be a load of the RACH corresponding to the sub-band.
  • the indication may also be a combination of the access probability of the sub-band, the access probability of the RACH corresponding to the sub-band, the load indication of the sub-band, and the load indication of the RACH corresponding to the sub-band.
  • the load indication of the sub-band can be used to represent the busyness of the sub-band, for example, 1 indicates that the sub-band is in a busy state, and 0 indicates that the sub-band is in an idle state; the load indication of the RACH can be used to represent the RACH on the sub-band
  • the busyness for example, 0 indicates that the RACH on the sub-band is in a busy state, and 1 indicates that the RACH on the sub-band is in an idle state; alternatively, the busyness of the sub-band or the busyness of the RACH on the sub-band may also be It is represented by a numerical value.
  • the degree of busyness of the sub-band can be expressed by 1 to 10, wherein the larger the value, the higher the busyness.
  • the degree of busyness of the sub-band can also be represented by 0 to 1, wherein the value is more Small, the more busy.
  • the case where the channel load parameter is the load indication of the RACH corresponding to the sub-band or the sub-band can determine which specific load indication is used to characterize the busyness of the sub-band according to factors used in evaluating the channel load parameter, and is not enumerated here. .
  • the access probability of the sub-band or the access probability of the RACH may be used to describe the success rate of the random access of the terminal device by using the RACH on the sub-band. The greater the access probability, the terminal device passes the sub-band. The higher the success rate of RACH for random access.
  • the correspondence between the current sub-band and the RACH is as shown in FIG. 5a or FIG. 5b, wherein the access probability of the sub-band 1 is 0.5, the access probability of the sub-band 2 is 0.4, and the access probability of the sub-band 3 is 0.6.
  • the access probability of the sub-band 4 is 0.2
  • the channel load parameters of the sub-band 1, the sub-band 2, the sub-band 3, and the sub-band 4 can be used as 0.5, 0.4, 0.6, and 0.2, respectively.
  • the terminal device can be known.
  • the probability of successful random access on subband 3 is the greatest, and the probability that the terminal device succeeds in random access on subband 4 is the smallest.
  • the channel load parameter may be determined according to information such as the number of terminal devices connected on the subband, the time when the subband is averaged, and the like.
  • the channel load parameter may be that the number of the terminal devices currently accessed by the sub-band and the sub-band are allowed to access.
  • the ratio of the number of terminal devices; the channel load parameter may also be a ratio of the number of terminal devices currently accessed by the sub-band to the number of terminal devices that the network device is allowed to access.
  • the channel load parameter may be a duty ratio of the sub-band over a predetermined period of time in the past; the channel load parameter may also be a sub-band a ratio of a duty ratio over a predetermined period of time in the past to a sub-band having a maximum duty ratio within a predetermined period of time of the past period, wherein the duty ratio refers to a period of time in the past The ratio of the time the subband is occupied to the time the subband is idle.
  • the channel load parameter is the access probability of the sub-band. The larger the channel load parameter is, the higher the success rate of the terminal device accessing through the RACH on the sub-band.
  • the number of terminal devices allowed to access each sub-band is 100
  • the number of terminal devices currently accessed by sub-band 1 is 30,
  • the number of terminal devices currently accessed by sub-band 2 is 20,
  • the terminal currently accessed by sub-band 3 is The number of devices is 40
  • the number of terminal devices currently accessed by subband 4 is 50.
  • the channel load parameter of subband 1 is 0.3
  • the channel load parameter of subband 2 is 0.35
  • the channel load parameter of subband 2 is 0.2
  • the channel load parameter of subband 3 is 0.4
  • subband subband.
  • the channel load parameter of 4 is 0.5.
  • the channel load parameter of subband 1 is 0.075
  • the channel load parameter of subband 2 is 0.05
  • the channel load parameter of subband 3 is 0.1
  • the channel load parameter of subband 4 is 0.125.
  • the channel load parameter is the access probability of the RACH corresponding to the sub-band.
  • the access probability of the RACH corresponding to the subband may be set to be the same as the access probability of the subband.
  • the channel load parameter is the load indication of the sub-band.
  • the duty ratio of subband 1 is 0.1
  • the duty ratio of subband 2 is 0.2
  • the duty ratio of subband 3 is 0.3
  • the duty ratio of subband 4 is 0.4 in the past period of time.
  • the channel load parameter of sub-band 1 is 0.1, and the channel load parameter of sub-band 2 is 0.2, The channel load parameter of the frequency band is 0.3, and the channel load parameter of the sub-band is 0.4; in another implementation, the channel load parameter of sub-band 1 is 0.25, the channel load parameter of sub-band 2 is 0.5, and the channel of sub-band 3 is The load parameter is 0.75 and the channel load parameter of subband 4 is 1.
  • the channel load parameter of sub-band 1 may be 16
  • the channel load parameter of sub-band 2 may be 8
  • the parameter may be 4, and the channel load parameter of subband 4 may be 2.
  • the channel load parameter is a load indication of the RACH corresponding to the sub-band.
  • the load indication of the RACH corresponding to the sub-band may be set to be the same as the load indication of the sub-band.
  • the channel indication information may be a starting frequency domain location or a frequency domain coverage.
  • the location of the RACH in the sub-band is fixed, and the bandwidth of the RACH is also fixed.
  • the initial frequency domain location of the RACH may be used to indicate the specific location of the RACH in the frequency domain, and the terminal device may The specific location of the RACH in the frequency domain is determined based on the location of the subband or the starting frequency domain location of the RACH.
  • the frequency domain coverage is used to indicate the specific location of the RACH in the frequency domain.
  • the frequency domain coverage of the RACH is 100 MHz to 105 MHz, and the terminal device can determine the RACH frequency according to the frequency domain coverage. The specific location on the domain.
  • the preamble sequence corresponding to each subband may be a preamble sequence group corresponding to each subband, or may be a sequence number range of the preamble sequence group corresponding to each subband.
  • the preamble sequence group is a set of multiple preamble sequences, and the preamble sequence in the same preamble group corresponds to the same subband;
  • the sequence number range of the preamble sequence group is a set of multiple preamble sequence numbers, and the preamble of the same sequence number range The sequence number corresponds to the same subband.
  • the preamble sequences numbered 1 to 16 may be assigned to subband 1 and the preamble sequences numbered 17 to 32 may be assigned to the subband.
  • the preamble sequences of numbers 33 to 48 are assigned to the subband 3
  • the preamble sequences of numbers 49 to 64 are assigned to the subband 4.
  • the preamble sequence group corresponding to subband 1 is a preamble sequence numbered from 1 to 16, and the sequence number range of the preamble sequence group corresponding to subband 1 is number 1 to number 16, and the number and preamble sequence are included. There is a one-to-one correspondence, and the terminal device can determine the preamble sequence corresponding to the subband by numbering.
  • Step S402 the terminal device accesses the target sub-band, wherein the target sub-band is a sub-band in at least one sub-band.
  • the terminal device may determine, according to the fourth information sent by the network device, the specific situation of each sub-band, and perform access in the target sub-band, where the terminal device performs random access in the RACH corresponding to the target sub-band, and accesses
  • the specific process may refer to the description of the foregoing four random access scenarios according to a specific scenario. For example, if the terminal device is the first access network, the target sub-band may be accessed according to the steps of the first scenario, for example, the terminal device is lost. If the uplink synchronization needs to access the network, the target sub-band can be accessed according to the steps in the second scenario, and details are not described herein.
  • the terminal device may use, as the target sub-band, a sub-band that is relatively idle or has a higher access success rate according to the fourth information sent by the network device.
  • the RACH and the sub-band have a one-to-one correspondence
  • the network device sends the fourth information to the terminal device to inform the terminal device of the information of the multiple sub-bands, and after determining the conditions of the sub-bands, the terminal device may The access is performed in the relatively idle target sub-band, and the related information of the sub-band is transmitted to the terminal device to prevent all the terminal devices from being concentrated on one sub-band for random access, which contributes to load balancing of the sub-band.
  • FIG. 9 is a schematic flowchart of another random access method according to an embodiment of the present application.
  • the embodiment of the present application is applicable to the foregoing second scheme for subband division and corresponding subband and RACH, such as As shown, the method includes:
  • Step S501 The first device sends a first indication message to the second device, where the second device receives the first indication message, where the first indication message carries a sub-band indication corresponding to the target sub-band.
  • the target sub-band is a sub-band of the plurality of sub-bands.
  • the subband indication may be a subband identifier, the subband indication may also be a frequency domain coverage, and the subband indication may also be a preamble sequence.
  • each sub-band can be distinguished by a unique identifier.
  • the sub-band is divided as shown in FIG. 6b, and the sub-band 1 identifier may be 001, and the sub-band 2 identifier may be 010, the identifier of subband 3 may be 011, the identifier of subband 4 may be 100, the identifier of subband 5 may be 101, the identifier of subband 6 may be 110, and the identifier of subband 7 may be 111.
  • each sub-band can be directly distinguished by the frequency domain coverage of the sub-band.
  • the sub-band is divided as shown in FIG. 6, and the frequency range coverage of sub-band 1 is a ⁇ a+F1, the frequency domain coverage of subband 2 is a+F1 ⁇ a+2F1, the frequency domain coverage of subband 3 is a+2F1 ⁇ a+3F1, and the frequency range coverage of subband 4 is a+3F1 ⁇ a+4F1, the frequency domain coverage of subband 5 is a ⁇ a+F2, the frequency domain coverage of subband 6 is a+ ⁇ a+2F2, and the frequency range coverage of subband 7 is a ⁇ a+F3.
  • a is the radio frequency corresponding to the starting position of the entire frequency band.
  • different preamble sequences or preamble sequence groups are allocated to different sub-bands, and the preamble sequence has a corresponding relationship with the sub-bands, and then The preamble sequence is indicated as a subband, and each subband is distinguished by a preamble sequence corresponding to the subband.
  • Step S502 the second device communicates with the first device in the target sub-band.
  • the first device may be a network device, and the first device may also be a terminal device.
  • the second device is a terminal device, and when the first device is a terminal device, the second device is a network device.
  • the second device communicating with the first device in the target sub-band includes: the second device sends a signal to the first device on the target sub-band; or the second device receives the signal sent by the first device.
  • the first device is a network device
  • the second device is a terminal device.
  • the first indication message may be a random access response Msg2, and the sub-band indication may be a sub-band identification or a frequency domain coverage, where the first indication message is a random access response Msg2 is applicable to the foregoing first, second, and
  • the terminal device switches to the target sub-band corresponding to the sub-band indication to work, that is, switches to the sending device identifier reporting message Msg3 on the target sub-band.
  • the following describes an example of subband variation in the case where the first indication message is the random access response Msg2 in the three random access scenarios.
  • the network device and the terminal device are initially Communication is performed on the first sub-band, and the target sub-band corresponds to the same RACH as the first sub-band, the RACH is in the first sub-band, and there is no RACH on the target sub-band.
  • FIG. 10a is a schematic diagram of a comparison of the changes of the sub-bands of the first random access scenario.
  • the preamble sequence reports the message Msg1, the random access response Msg2, and the device identifier report message.
  • Msg3, the contention resolution response Msg4 is transmitted on the RACH in one frequency band.
  • the terminal device sends the preamble sequence reporting message Msg1 on the RACH of the first subband, and the network device sends the message to the terminal on the RACH channel.
  • the device sends a random access response Msg2, and the random access response Msg2 carries the sub-band indication.
  • the terminal device After receiving the random access response Msg2, the terminal device switches to the sending device identifier reporting message Msg3 according to the sub-band indication, and the network device is in the target.
  • the contention response Msg4 is sent on the sub-band.
  • the terminal device may also listen to the scheduling information such as the PDCCH sent by the network device on the target sub-band.
  • FIG. 10b is a schematic diagram of comparison of changes in subbands of the second random access scenario.
  • the preamble sequence reports the message Msg1, and the random access response Msg2 is in one frequency band.
  • the terminal device sends a preamble sequence reporting message Msg1 on the RACH of the first sub-band, and the network device sends a random access response Msg2 to the terminal device on the RACH channel, and the random access is performed.
  • the Msg2 carries the sub-band indication, and after receiving the random access response Msg2, the terminal device switches to work on the target sub-band according to the sub-band indication. For example, the terminal device monitors scheduling information such as the PDCCH sent by the network device on the target sub-band.
  • FIG. 10c is a schematic diagram of a comparison of changes in a sub-band of a fourth random access scenario.
  • the preamble sequence reports the message Msg1, the random access response Msg2, and the device identifier report message.
  • the Msg3 is transmitted on the RACH on the first sub-band; in the solution of the embodiment of the present application, the terminal device sends the preamble sequence report message Msg1 and the device identifier report message Msg3 on the RACH of the first sub-band, and the network device is in the RACH.
  • the first indication message may also be a contention resolution response Msg4, and the sub-band indication may be a sub-band identification or a frequency domain coverage, where the first indication message is a scenario in which the contention resolution response Msg4 is applicable to the first type of random access, and the terminal After receiving the contention resolution response Msg4, the device switches to work on the target sub-band corresponding to the sub-band indication, for example, to switch to transmit data on the target sub-band.
  • the preamble sequence reporting message Msg1, the random access response Msg2, the device identification reporting message Msg3, and the contention resolution response Msg4 are all transmitted on the RACH in one frequency band;
  • the scheme, the preamble sequence reporting message Msg1, the random access response Msg2, the device identification reporting message Msg3, the contention resolution response Msg4 is transmitted on the first sub-band, and after receiving the contention resolution response Msg4, the terminal device switches to the sub-band indication according to the sub-band indication Working on the target sub-band, for example, the terminal device listens to scheduling information such as a PDCCH transmitted by the network device on the target sub-band.
  • the first indication message may also be a downlink control command PDCCH order
  • the sub-band indication may be a sub-band identifier or a frequency domain coverage, where the first indication message is a downlink control command PDCCH order, and is applicable to the third random access. Scenes. After receiving the downlink control command PDCCH order, the terminal device switches to work on the target sub-band corresponding to the sub-band indication, performs contention-based random access or non-contention-based random access.
  • a part of the information bits in the original downlink control information (DCI) format may be used to carry the sub-band indication.
  • part of the original DCI format may be modified.
  • a DCI format can also be newly defined to carry the sub-band indication, for example, a part of the original DCI format can be added.
  • the first indication message is the downlink control command PDCCH order in the third random access scenario, see FIG. 12a and FIG. 12b.
  • the downlink control command PDCCH order, the preamble sequence reporting message Msg1, the random access response Msg2, the device identification reporting message Msg3, and the contention resolution response Msg4 are all on the RACH in one frequency band.
  • the network device sends a downlink control command PDCCH order to the terminal device on the RACH of the first sub-band, and after receiving the downlink control command PDCCH order, the terminal device switches to the target sub-band for performing The contention random access, that is, the preamble sequence reporting message Msg1, the random access response Msg2, the device identification reporting message Msg3, and the contention resolution response Msg4 are transmitted on the target subband.
  • the contention random access that is, the preamble sequence reporting message Msg1, the random access response Msg2, the device identification reporting message Msg3, and the contention resolution response Msg4 are transmitted on the target subband.
  • the downlink control command PDCCH order, the preamble sequence reporting message Msg1, and the random access response Msg2 are all transmitted on the RACH in the first sub-band;
  • the device sends a downlink control command PDCCH order to the terminal device on the RACH of the first sub-band, and after receiving the downlink control command PDCCH order, the terminal device switches to the target sub-band to perform non-contention-based random access, that is, the preamble sequence is reported.
  • the message Msg1, the random access response Msg2 is transmitted on the target sub-band.
  • the network device fails due to insufficient load of the target subband.
  • the first indication message in the above two formats may be used to notify the terminal device to switch to the next target sub-band, and the sub-band in the handover process
  • the foregoing first indication message is a random access response
  • the first indication message is a contention resolution response
  • the first device is a terminal device
  • the second device is a network device.
  • the network device may further include: sending, by the network device, the second information, the second information, to the terminal device A preamble sequence corresponding to each of the plurality of subbands is included.
  • the preamble sequence corresponding to each of the multiple sub-bands has been introduced in the first method embodiment of the present application. For details, refer to the related description in the foregoing step S401, and details are not described herein again.
  • the terminal device may further include: before the terminal device sends the first indication message to the network device, the network device sends the first information, the first information, to the terminal device.
  • Subband information including a plurality of subbands.
  • the sub-band information in the multiple sub-bands is described in the first method embodiment of the present application.
  • the related description in the foregoing step S401 and details are not described herein again.
  • the terminal device may determine the target sub-band from the plurality of sub-bands according to the sub-band information, and notify the network device by using the first indication message that the terminal device wants to perform random connection on the target sub-band. Enter or work on the target sub-band.
  • the network device may further include: the network device sends the third information to the terminal device, where the third information is Channel indication information of a random access channel including a plurality of sub-bands.
  • the channel indication information is described in the first method embodiment of the present application. For details, refer to the related description in the foregoing step S401, and details are not described herein again.
  • the terminal device After acquiring the channel indication information of the random access channel of the multiple sub-bands, the terminal device sends the first indication message on the random access channel corresponding to the target sub-band.
  • the RACH has only one, and all the sub-bands correspond to one RACH, and the terminal device sends a first indication message on the RACH.
  • the target sub-band corresponds to multiple RACHs
  • the target sub-band is sub-band 5 in FIG. 7a
  • the terminal device may be on any RACH corresponding to the target sub-band.
  • the first information, the second information, and the third information may be broadcast information, and are carried in the MIB, the SIB1, or the SIB2, and sent to the terminal device.
  • the first indication message may be a preamble sequence reporting message Msg1
  • the subband indication may be a preamble sequence
  • the first indication message is a preamble sequence reporting message Msg1 is applicable to the foregoing first, second, and fourth types of random access.
  • the scenario has a corresponding relationship between the preamble sequence and the subband.
  • the following describes an example of subband variation in the case where the first indication message is the preamble sequence reporting message Msg1 in the three random access scenarios, see FIG. 13a to FIG. 13c.
  • FIG. 13a is a schematic diagram of comparison of changes in subbands of the first random access scenario, as shown in FIG.
  • the preamble sequence reporting message Msg1, the random access response Msg2, the device identification reporting message Msg3, and the contention resolution response Msg4 are all transmitted on the RACH in one frequency band;
  • the preamble sequence reporting message Msg1 is transmitted on the RACH of a sub-band, and the preamble sequence reporting message Msg1 carries the preamble sequence corresponding to the target sub-band.
  • the network device After receiving the preamble sequence reporting message Msg1, the network device determines the target sub-band according to the preamble sequence, and the network device The random access response Msg2 is sent to the terminal device on the target sub-band, and the terminal device sends the device identification report message Msg3 on the target sub-band, and the network device sends the contention resolution response Msg4 on the target sub-band.
  • FIG. 13b is a schematic diagram of comparison of changes in subbands of the second random access scenario.
  • the preamble sequence reports the message Msg1, and the random access response Msg2 is in one frequency band.
  • the RACH is transmitted on the RACH.
  • the terminal device sends the preamble sequence reporting message Msg1 on the RACH of the first sub-band.
  • the network device determines the target sub-band according to the preamble sequence.
  • the device sends a random access response Msg2 to the terminal device on the target sub-band, and the terminal device continues to work on the target sub-band. For example, the terminal device monitors scheduling information such as the PDCCH sent by the network device on the target sub-band.
  • FIG. 13c is a schematic diagram of comparison of changes in subbands of the fourth random access scenario.
  • the preamble sequence reports Msg1, the random access response Msg2, and the device identifier report message.
  • the Msg3 is transmitted on the RACH in a frequency band.
  • the terminal device sends the preamble sequence reporting message Msg1 and the device identifier reporting message Msg3 on the RACH of the first sub-band, and the network device receives the preamble sequence reporting message.
  • the target sub-band is determined according to the preamble sequence, and the network device sends a random access response Msg2 to the terminal device on the target sub-band, and the terminal device continues to work on the target sub-band, for example, the terminal device monitors the target sub-band.
  • Scheduling information such as PDCCH transmitted by the network device.
  • the first indication message may also be a device identifier report message Msg3, where the sub-band indication may be a sub-band identifier or a frequency domain coverage, where the first indication message is a device identifier report message Msg3 is applicable to the first type and the fourth type of random
  • the network device determines that the target sub-band is the working sub-band of the terminal device.
  • the following describes an example of subband variation in the case where the first indication message is the device identification report message Msg3 in the first and fourth random access scenarios, see FIG. 14a and FIG. 14b.
  • FIG. 14a is a schematic diagram of comparison of changes in sub-bands of the first random access scenario.
  • the preamble sequence reports the message Msg1, the random access response Msg2, and the device identifier report message.
  • the Msg3, the contention resolution response Msg4 is transmitted on the RACH in a frequency band.
  • the preamble sequence reporting message Msg1, the random access response Msg2, and the device identifier reporting message Msg3 are transmitted on the first sub-band.
  • the network device After receiving the device identifier report message Msg3, the network device determines the target sub-band according to the sub-band indication, and the network device sends a contention resolution response Msg4 to the terminal device on the target sub-band, and the terminal device continues to work on the target sub-band, for example, the terminal device
  • the scheduling information such as the PDCCH transmitted by the network device is monitored on the target sub-band.
  • FIG. 14b is a schematic diagram of a comparison of the changes of the sub-bands of the fourth random access scenario.
  • the preamble sequence reports the message Msg1, the random access response Msg2, and the device identifier report message.
  • the Msg3 is transmitted on the RACH on one sub-band; the terminal device sends the preamble sequence report message Msg1 and the device identifier report message Msg3 on the RACH of the first sub-band, and the network device receives the set.
  • the network device After identifying the report message Msg3, determining the target sub-band according to the sub-band indication, the network device sends a random access response Msg2 to the terminal device on the target sub-band, and the terminal device continues to work on the target sub-band, for example, the terminal device is in the The scheduling information such as the PDCCH transmitted by the network device is monitored on the target sub-band.
  • the first indication message is a preamble sequence report message or a device identifier report message is also applicable to the third random access scenario, where the terminal device receives the PDCCH order sent by the network device and decides to re-compete or In the case of non-contention random access, the terminal device needs to switch to another sub-band for random access, and the terminal device can notify the network device to communicate with the terminal device on the target sub-band by sending a first indication message to the network device.
  • the foregoing first indication message is a preamble sequence report message
  • the first indication message is a device identifier report message, and details are not described herein again.
  • the method in the embodiment of the present application is also applicable to the foregoing third solution for subband division and corresponding of the subband and the RACH.
  • the terminal device may determine, according to the first information, the second information, and the third information sent by the network device, a condition of each sub-band, and use a sub-band with a relatively high idle or access success rate as a sub-band.
  • the target sub-band and then determining the RACH of the target sub-band to perform random access.
  • the RACH corresponding to the target sub-band also corresponds to other sub-bands, and the terminal device sends the first on the RACH corresponding to the target sub-band.
  • the indication message carries the sub-band indication in the first indication message, so that the network device can know that the target sub-band is the working sub-band of the terminal device.
  • the terminal device communicates with the network device through the target sub-band, and the scenario in which the terminal device sends the first indication message to the network device, that is, the change of the sub-band can be referred to the above-mentioned FIG. 13a to FIG. 13c or FIG. A schematic diagram of the solution of the application embodiment.
  • the first device when there is only one RACH, the first device sends a first indication message to the second device, where the first indication message carries the sub-band indication, and after receiving the sub-band indication, the second device Communicating with the first device on the sub-band indication, and switching the sub-band in time can prevent the terminal device from occupying the RACH for a long time;
  • the first indication message of the application may be a PDCCH order, and the terminal device and the network device are lost in synchronization and need to be re-randomized.
  • the sub-bands of the access can be switched, and the load of each sub-band can be equalized to some extent.
  • the first device is the terminal device, and the second device is the network device, and the first device sends the first indication message to the second device, so that the first device knows the working subband of the second device, and Helps achieve a reasonable allocation of resources.
  • FIG. 15 is a schematic structural diagram of a system composed of a first device and a second device according to an embodiment of the present disclosure.
  • the first device 70 and the second device 80 have a communication connection with each other.
  • a communication connection for example, wifi connection, mobile data connection, etc.
  • the units of the first device and the second device may implement the present application by hardware, software, or a combination of hardware and software.
  • the units described in the figures can be combined or separated into several sub-units to implement the present application. Accordingly, what has been described above in this application can support any possible combination or separation or further definition of a single end as described below.
  • the first device may be a terminal device or a network device; when the first device is a terminal device, the second device is a network device; and when the first device is a network device, the first device is a terminal device. .
  • the first device 70 can include:
  • the sending unit 710 is configured to send, to the second device, a first indication message, where the first indication message carries a sub-band indication corresponding to the target sub-band, where the first indication message is used to indicate that the second device is in the target sub- Receiving a signal transmitted by the first device or transmitting a signal to the first device;
  • the sending unit 710 is further configured to send a signal to the second device in the target sub-band;
  • the receiving unit 720 is configured to receive, by the target sub-band, a signal sent by the second device.
  • the target sub-band may be a sub-band of the plurality of sub-bands.
  • the receiving unit 720 is further configured to receive the first information sent by the second device, where the first information includes a preamble sequence corresponding to each of the plurality of subbands.
  • the target sub-band is a sub-band of the plurality of sub-bands
  • the receiving unit 720 is further configured to: receive the second information sent by the second device, the second The information includes sub-band information of the plurality of sub-bands.
  • the target sub-band is a sub-band of the plurality of sub-bands
  • the receiving unit 720 is further configured to: receive third information sent by the second device, where the third information includes Channel indication information of a plurality of sub-bands of the random access channel; the first device sending the first indication message to the second device, where the first device sends the first indication to the second device in the random access channel corresponding to the target sub-band Message.
  • the second device 80 can include:
  • the receiving unit 810 receives a first indication message sent by the first device, where the first indication message carries a sub-band indication corresponding to the target sub-band;
  • the receiving unit 810 is further configured to receive, by using the target sub-band, a signal sent by the first device;
  • the sending unit 820 is configured to send a signal to the first device in the target sub-band.
  • the target sub-band may be a sub-band of the plurality of sub-bands.
  • the sending unit 820 is further configured to send the first information to the first device, where the first The information includes a preamble sequence corresponding to each of the plurality of sub-bands.
  • the target sub-band is a sub-band of the plurality of sub-bands
  • the sending unit 820 is further configured to: the first device sends the second information, where the second information includes the Subband information for each of a plurality of subbands.
  • the target sub-band is a sub-band of the plurality of sub-bands
  • the sending unit 820 is further configured to: send the third information to the first device, where the third information includes multiple The channel indication information of the random access channel of the sub-band; the receiving unit 810 is specifically configured to: receive, by using the random access channel corresponding to the target sub-band, the first indication message sent by the first device.
  • the first indication message is further used to indicate that the target sub-band is a working sub-band of the first device, that is, a target sub-band The working subband of the terminal device.
  • the first indication message may be a random access response; the first indication message may also be a contention resolution response; and the first indication message may also be a downlink control. command.
  • the first indication message may be a device identifier report message; the first indication message may also be a preamble sequence report message.
  • the subband information may be at least one of a bandwidth, a frequency domain location, a frequency domain range, or a channel load parameter. information.
  • the channel load parameter may be an access probability of the sub-band; the channel load parameter may also be a load indication of the sub-band; the channel load parameter may also be an access probability of the random access channel corresponding to the sub-band; channel load parameter It may also be a load indication of a random access channel corresponding to the subband.
  • the channel load parameter may be a ratio of the number of first devices currently accessed by the subband to the number of first devices allowed to access the subband; the channel load parameter may also be the current access of the subband.
  • the ratio of the duty ratio in the past predetermined period of time to the sub-band with the largest duty ratio in the past predetermined period of time; the channel load parameter can also be weighted for the above several values.
  • the value of the channel load parameter may also be a sequence number obtained by sorting the above several values or the like.
  • the channel indication information includes a starting frequency domain location or a frequency domain coverage.
  • the preamble sequence corresponding to each subband may be a preamble sequence group corresponding to each subband, that is, a set of multiple preamble sequences; or may be a range of preamble sequence numbers corresponding to each subband, that is, a number of multiple preamble sequences. Collection.
  • the sub-band indication includes a sub-band identification, a frequency domain coverage, or a preamble sequence.
  • the subband indication may be a preamble sequence; in a case where the first indication message is a contention resolution response, a downlink control command, a random access response, or a device identifier reporting message, the sub The band indication can be a sub-band identification or a frequency domain coverage.
  • the first device sends a first indication message to the second device, where the first indication message carries a sub-band indication corresponding to the target sub-band, so that the second device switches or accesses the target sub-sub
  • the sub-band communicates with the first device in the frequency band, and the sub-band between the first device and the second device can be adjusted in time to implement load balancing between the sub-bands.
  • FIG. 16 is a schematic structural diagram of a system composed of a network device and a terminal device according to an embodiment of the present disclosure.
  • a network device 90 and a terminal device 100 have a communication connection with each other, such as a wifi connection.
  • Mobile data connection, etc. can achieve mutual data communication between the two.
  • the units of the network device and the terminal device may implement the present application by hardware, software, or a combination of hardware and software.
  • the units described in the figures can be combined or separated into several sub-units to implement the present application. Accordingly, what has been described above in this application can support any possible combination or separation or further definition of a single end as described below.
  • the network device 90 can include:
  • the sending unit 910 sends, to the terminal device, fourth information, where the fourth information includes subband information of at least one subband, a preamble sequence corresponding to each subband in at least one subband, or a random access channel of at least one subband Channel indication information;
  • the receiving unit 920 is configured to listen to a random access request sent by the terminal device on a random access channel corresponding to each subband in the at least one subband.
  • the terminal device 100 may include:
  • the receiving unit 1010 is configured to receive fourth information that is sent by the network device, where the fourth information includes subband information of at least one subband, a preamble sequence corresponding to each subband in the at least one subband, or a random of at least one subband Channel indication information of the access channel;
  • the processing unit 1020 is configured to access a target sub-band, where the target sub-band is a sub-band in the at least one sub-band.
  • the channel load parameter may be an access probability of the sub-band; the channel load parameter may also be a load indication of the sub-band; the channel load parameter may also be an access probability of the random access channel corresponding to the sub-band; channel load parameter It may also be a load indication of a random access channel corresponding to the subband.
  • the channel load parameter may be a ratio of the number of terminal devices currently accessed by the subband to the number of terminal devices that the subband is allowed to access; the channel load parameter may also be the terminal device currently accessed by the subband.
  • the ratio of the number to the number of terminal devices allowed to be accessed by the network device; the channel load parameter may also be the duty cycle of the sub-band over a predetermined period of time in the past; the channel load parameter may also be a sub-band in the past.
  • the parameter may also be a sequence number obtained by sorting the above several values or the like.
  • the channel indication information includes a starting frequency domain location or a frequency domain coverage.
  • the sub-band indication includes a sub-band identification, a frequency domain coverage, or a preamble sequence.
  • the preamble sequence corresponding to each subband may be a preamble sequence group corresponding to each subband, that is, a set of multiple preamble sequences; or may be a range of preamble sequence numbers corresponding to each subband, that is, a number of multiple preamble sequences. Collection.
  • the network device can transmit various information of multiple sub-bands to the terminal device, and the terminal device can access from a plurality of sub-bands in a suitable target sub-band, and can ensure each sub-band to a certain extent. Load balancing.
  • FIG. 17 is a schematic diagram of a hardware structure of a network device provided by the present application, where the network device 110 includes a processor 1101.
  • the memory 1102, the transceiver 1102, the processor 1101, the memory 1102, and the transceiver 1102 are connected by one or more communication buses 1104.
  • the processor 1101 is configured to support the network device to perform the respective functions of the method described in FIG. 8 or 9.
  • the processor 1101 can be a central processing unit (CPU), a network processor (NP), a hardware chip, or any combination thereof.
  • the hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.
  • the PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (GAL), or any combination thereof.
  • the memory 1102 is used to store program codes and the like.
  • the memory 1102 can include a volatile memory, such as a random access memory (RAM); the memory 1102 can also include a non-volatile memory, such as a read-only memory (read- Only memory, ROM), flash memory, hard disk drive (HDD) or solid-state drive (SSD); the memory 1102 may also include a combination of the above types of memory.
  • RAM random access memory
  • ROM read-only memory
  • HDD hard disk drive
  • SSD solid-state drive
  • the memory 1102 may also include a combination of the above types of memory.
  • the transceiver 1103 is for receiving and transmitting data.
  • the processor 1101 can invoke the program code to perform the following operations:
  • the transceiver 1103 transmits a signal to the terminal device or receives a signal transmitted by the terminal device in the target sub-band.
  • the processor 1101 can also invoke program code to perform the following operations:
  • the transceiver 1103 Transmitting, by the transceiver 1103, fourth information to the terminal device, where the fourth information includes subband information of at least one subband, a preamble sequence corresponding to each subband in at least one subband, or a random access channel of at least one subband Channel indication information; the random access request sent by the terminal device is intercepted by the transceiver 1103 on a random access channel corresponding to each sub-band in the at least one sub-band.
  • processor 1101 may also perform operations performed by the network device in the method shown in FIG. 8 or 9.
  • the embodiment of the present application further provides a computer storage medium, where the computer storage medium stores a computer program, where the computer program includes program instructions, and when the program instructions are executed by the computer, the computer is executed as shown in FIG. 8 or 9.
  • the method of the corresponding embodiment, the computer being part of the network device mentioned above.
  • the embodiment of the present application further provides a computer program, including program instructions, when executed by a computer, for performing the method as described in the embodiment corresponding to FIG. 8 or FIG. 9, the computer program may be A portion of the program stored in the memory 1102.
  • FIG. 18 is a structural block diagram of an implementation manner of the terminal device provided by the present application.
  • the baseband chip 1310, the memory 1315 (one or more computer readable storage media), the radio frequency (RF) module 1316, and the peripheral system 1317 can be included. These components can communicate over one or more communication buses 1313.
  • the peripheral system 1317 is mainly used to implement the interaction function between the terminal device 130 and the user/external environment, and mainly includes input and output devices of the terminal device 130.
  • the peripheral system 1317 can include a camera controller 1318, an audio controller 1319, and a sensor management module 1320. Each controller may be coupled to a respective peripheral device such as a camera 1321, an audio circuit 1322, and a sensor 1323.
  • the camera 1321 can be a 3D camera.
  • the sensor 1323 can be an infrared sensor, a fingerprint sensor, a displacement sensor, an energy sensor, a temperature sensor, a humidity sensor, a light sensor, and the like.
  • peripheral system 1317 may further include other I/O peripherals.
  • the peripheral system 1317 further includes a Radio Frequency Identification (RFID) read/write controller 1324, wherein the RFID read/write controller and the RFID Read and write The unit 1325 is coupled.
  • RFID Radio Frequency Identification
  • the baseband chip 1310 can be integrated to include a processor 1311, a clock module 1312, and a power management module 1313.
  • the clock module 1312 integrated in the baseband chip 1310 is primarily used to generate the clocks required for data transfer and timing control for the processor 1311.
  • the power management module 1313 integrated in the baseband chip 1310 is mainly used to provide a stable, high-accuracy voltage for the processor 1311, the radio frequency module 1316, and the peripheral system 1317.
  • the processor/ can be a central processor unit (CPU), an embedded microcontroller (Micro Controller Unit (MCU), an embedded microprocessor (MPU), embedded System on Chip (SoC) and more.
  • CPU central processor unit
  • MCU Micro Controller Unit
  • MPU embedded microprocessor
  • SoC System on Chip
  • a radio frequency (RF) module 1316 is used to receive and transmit radio frequency signals, primarily integrating the receiver and transmitter of the terminal device 130.
  • Radio frequency (RF) module 1316 communicates with the communication network and other communication devices via radio frequency signals.
  • the radio frequency (RF) module 1316 may include, but is not limited to: at least one eUICC, an antenna system, an RF transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a CODEC chip. , storage media, etc.
  • a radio frequency (RF) module 1316 can be implemented on a separate chip. In this application, the radio frequency module is configured to send a first indication message to the network device under the direction of the processor.
  • Memory 1315 is coupled to processor 1311 for storing various software programs and/or sets of commands.
  • memory 1315 can include high speed random access memory, and can also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid state storage devices.
  • the memory 1315 can store an operating system (hereinafter referred to as a system) such as an embedded operating system such as ANDROID, IOS, WINDOWS or LINUX.
  • the memory 1315 can also store a network communication program that can be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices.
  • the memory 1315 can also store a user interface program, which can realistically display the content of the application through a graphical operation interface, and receive user control operations on the application through input controls such as menus, dialog boxes, and keys. .
  • the memory 1315 can also store one or more applications.
  • the embodiment of the present application further provides a computer storage medium, where the computer storage medium stores a computer program, where the computer program includes program instructions, and when the program instructions are executed by the computer, the computer is executed as shown in FIG. 8 and FIG.
  • the computer may be part of the terminal device mentioned above.
  • the embodiment of the present application further provides a computer program, including program instructions, when executed by a computer, for performing the method as described in the embodiment corresponding to 8 or FIG. 9, the computer program may be mentioned above.
  • the memory 1315 stores a portion of the program.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions.
  • the software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art.
  • RAM memory random access memory
  • ROM memory read-only memory
  • EPROM memory Erasable programmable read-only memory
  • EEPROM memory electrically erasable programmable read-only memory
  • registers hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art.
  • hard disk hard disk
  • CD-ROM Compact Disk Read Only Memory
  • One kind An exemplary storage medium is coupled to the processor, such that the processor can read information from the storage medium and can write information to the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

La présente invention concerne un procédé d'accès aléatoire, un appareil de terminal et un appareil de réseau. Le procédé comprend les étapes suivantes : un premier dispositif envoie un premier message d'instruction à un second dispositif, le premier message d'instruction transportant une instruction de sous-bande correspondant à une sous-bande cible, et le premier message d'instruction étant utilisé afin d'ordonner au second dispositif de recevoir un signal envoyé par le premier dispositif dans la sous-bande cible ou d'envoyer un signal au premier dispositif ; et le premier dispositif envoie un signal au second dispositif dans la sous-bande cible ou reçoit le signal envoyé par le second dispositif. En utilisant la solution technique de la présente invention, une sous-bande pour une communication entre une station de base et un dispositif terminal peut être réglée de manière opportune, maintenant un équilibrage de charge de sous-bandes.
PCT/CN2017/088499 2017-06-15 2017-06-15 Procédé d'accès aléatoire et dispositif associé WO2018227493A1 (fr)

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