WO2018131891A1 - Procédé et appareil de configuration de ressources d'accès aléatoire, et procédé et appareil d'accès aléatoire - Google Patents

Procédé et appareil de configuration de ressources d'accès aléatoire, et procédé et appareil d'accès aléatoire Download PDF

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Publication number
WO2018131891A1
WO2018131891A1 PCT/KR2018/000490 KR2018000490W WO2018131891A1 WO 2018131891 A1 WO2018131891 A1 WO 2018131891A1 KR 2018000490 W KR2018000490 W KR 2018000490W WO 2018131891 A1 WO2018131891 A1 WO 2018131891A1
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WIPO (PCT)
Prior art keywords
preamble
random access
physical random
access channel
base station
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PCT/KR2018/000490
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English (en)
Inventor
Chen QIAN
Bin Yu
Di SU
Qi XIONG
Yingjie Zhang
Jingxing Fu
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Samsung Electronics Co., Ltd.
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Priority claimed from CN201710184595.4A external-priority patent/CN108307506B/zh
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Publication of WO2018131891A1 publication Critical patent/WO2018131891A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention generally relates to a wireless communication field, more particularly, to a method and an apparatus for configuring random access resources and a method and an apparatus for random access.
  • the 5G or pre-5G communication system is also called a 'Beyond 4G Network' or a 'Post Long Term Evolution (LTE) System'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 28GHz or 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 28GHz or 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs Cloud Radio Access Networks
  • D2D device-to-device
  • wireless backhaul moving network
  • cooperative communication Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like.
  • CoMP Coordinated Multi-Points
  • FSK Hybrid frequency shift keying
  • FQAM quadrature amplitude modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • ITU-R M. [IMT. VISION] the report of the ITU, ITU-R M. [IMT. VISION], wherein a prospect in requirement, application scenes and various important performance indexes of 5G are made to particular explanations.
  • ITU-R M. [IMT. FUTURE TECHNOLOGY TRENDS] of the ITU provides information associated with the 5G technology trend, which aims to solve significant problems on notable increase in system throughput, consistency in user experience, extensibility to support IoT, time delay, energy efficiency, cost, network flexibility, support in emerging business and flexible spectrum utilization, etc.
  • Random access performance directly affects user experience.
  • a random access procedure is applied to a plurality of scenes, such as establishing an initial connection, cell handover, re-establishing uplink connections and RRC connection reconstruction, etc.
  • the exemplary embodiments of the present invention aim to provide a method and a device for configuring random access resources and a random access method and a random access device, which can configure proper preamble formats for user terminals within a base station coverage for operating frequency bands of a base station so as to satisfy different requirements under different operating frequency bands.
  • a method for configuring random access resources includes: (A) configuring preamble formats for user terminals within a base station coverage according to a carrier frequency range of the base station; (B) configuring physical random access channel resources for the user terminals within the base station coverage; (C) configuring preamble resource pools for the user terminals within the base station coverage; and (D) informing the user terminals within the base station coverage of the configured preamble formats, physical random access channel resources and preamble resource pools.
  • parameters for characterizing the preamble formats include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number, wherein the subcarrier spacing determines a subsequence length; or parameters for characterizing the preamble formats include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number; and a subsequence length and/or a sequence repetition number within the subsequence, wherein the subcarrier spacing determines the subsequence length.
  • the steps of informing user terminals of configured preamble formats includes: informing the user terminals of preamble format index corresponding to the configured preamble formats in a preamble format index table, wherein the preamble format index table includes subcarrier spacings, and the preamble format indexes of respective preamble formats are successively continuous non-negative integers starting from 0 in the preamble format index table; and/or informing the user terminals of the preamble format index corresponding to the configured preamble formats in a preamble format index table, wherein in the preamble format index table, indexes of combinations composed of the respective preamble formats and each of waveforms used by their own corresponding uplink sharing channels are successively continuous nonnegative integers starting from 0.
  • the steps of informing the user terminals of the configured preamble formats and physical random access channel resources includes: informing the user terminals of the physical random access channel configuration indexes corresponding to both of the configured preamble formats and physical random access channel resources in the physical random access channel configuration index table, wherein in the physical random access channel configuration index table, combinations composed of the respective preamble formats and each of their own corresponding physical random access channel configurations are ordered according to the corresponding carrier frequency ranges, and physical random access channel configuration indexes of the combinations that correspond to any one carrier frequency range are successively continuous nonnegative integers starting from 0.
  • the steps of informing user terminals of the configured preamble formats and physical random access channel resources includes: informing the user terminals of an available physical random access channel configuration index table for the base station and indexes corresponding to both of the configured preamble formats and physical random access channel resources in the available physical random access channel configuration index table, wherein in the available physical random access channel configuration index table, the indexes of the combinations composed of the respective available preamble formats of the base station and each of their own corresponding physical random access channel configurations are successively continuous non-negative integers starting from 0.
  • the steps of informing the user terminals of the configured preamble resource pools includes: informing the user terminals of the number of the preamble sequences in the configured preamble resource pools and preamble sequence start indexes of the configured preamble resource pools, wherein the preamble sequences in the preamble resource pools are determined according to the number of preamble sequences in the preamble resource pools and the preamble sequence start indexes.
  • the step (A) includes: configuring the preamble formats for the user terminals within the base station coverage according to a carrier frequency range, a coverage requirement and a requirement for combating delay spread of multi-path channel of the base station.
  • the step (B) includes: configuring the physical random access channel resources for the user terminals within the base station coverage according to a load situation of the base station; and/or the step (C) includes: configuring the preamble resource pools for the user terminals within the base station coverage according to a load situation of the base station.
  • the method further includes: updating the preamble formats that have been configured for the user terminals within the base station coverage when a first pre-configured condition is satisfied; and informing the user terminals within the base station coverage of the updated preamble formats.
  • the method further includes: updating the preamble formats that have been configured for the user terminals within the base station coverage according to the information indicating a wireless channel environment within the base station coverage during a current predetermined time period, when a first pre-configured condition is satisfied.
  • the method further includes: updating the physical random access channel resources that have been configured for the user terminals within the base station coverage when a second pre-configured condition is satisfied, and informing the user terminals within the base station coverage of the updated physical random access channel resources; and/or updating the preamble resource pools that have been configured for the user terminals within the base station coverage when a third pre-configured condition is satisfied, and informing the user terminals within the base station coverage of the updated preamble resource pools.
  • the physical random access channel resources that have been configured for the user terminals within the base station coverage are updated according to a current load situation of the base station, when a second pre-configured condition is satisfied; and/or the preamble resource pools that have been configured for the user terminals within the base station coverage are updated according to the current load situation of the base station, when a third pre-configured condition is satisfied.
  • the step (A) includes: for each of wave beams adopted by the base station, configuring the preamble formats for the user terminals within the coverage of each of the wave beams according to a coverage requirement of each of the wave beams, a requirement for combating delay spread of multi-path channel and a carrier frequency range of the base station;
  • the step (B) includes: for each of the wave beams, configuring the physical random access channel resources for the user terminals within the coverage of each of the wave beams;
  • the step (C) includes: for each of the wave beams, configuring the preamble resource pools for the user terminals within the coverage of each of the wave beams.
  • the step (B) includes: for each of the wave beams, configuring the physical random access channel resources for the user terminals within the coverage of each of the wave beams according to a load situation of each of the wave beams; and/or the step (C) includes: for each of the wave beams, configuring the preamble resource pools for the user terminals within the coverage of each of the wave beams according to the load situation of each of the wave beams.
  • the method further includes: updating the preamble formats that have been configured for the user terminals within the coverage of any one wave beam when the any one wave beam satisfies a corresponding fourth pre-configured condition; and informing the user terminals within the coverage of the any one wave beam of the updated preamble formats.
  • the preamble formats that have been configured for the user terminals within the coverage of the any one wave beam are updated according to the information indicating a wireless channel environment within the coverage of the any one wave beam during a current predetermined time period, when the any one wave beam satisfies a corresponding fourth pre-configured condition.
  • the information indicating the wireless channel environment within the coverage during the current predetermined time period is obtained by performing statistics on channel state information and/or uplink channel measurement results fed back by connected user terminals within the coverage during the current predetermined time period.
  • the information indicating the wireless channel environment within the coverage during the current predetermined time period includes at least one of the following items: the maximum uplink channel time delay spread obtained according to uplink channel measurement results during a current predetermined time period; the maximum path loss obtained according to uplink channel measurement results during the current predetermined time period or measurement reports fed back by user terminals; the maximum Doppler frequency shift obtained according to the uplink channel measurement results during the current predetermined time period or user terminal mobility information in the measurement reports fed back by the user terminals during the current predetermined time period; and the maximum link budget obtained according to the uplink channel measurement results during the current predetermined time period or the measurement reports fed back by the user terminals.
  • the preamble formats that have been configured for user terminals are updated through at least one of the following patterns: if a cyclic prefix length in the configured preamble formats cannot satisfy the maximum uplink channel time delay spread, the configured preamble formats are updated to satisfy the preamble formats of the maximum uplink channel time delay spread; if the cyclic prefix length shorter than a cyclic prefix length in the configured preamble formats can satisfy the maximum uplink channel time delay spread, the configured preamble formats are updated to the preamble formats corresponding to the shorter cyclic prefix length; if the maximum path loss is greater than the path loss supported by the configured preamble formats, the configured preamble formats are updated to the preamble formats that can support the maximum path loss; if the configured preamble formats cannot satisfy the maximum user terminal movement speed determined according to the maximum Doppler frequency shift or the user terminal mobility information, the configured preamble formats are updated to the preamble formats that can satisfy the maximum user terminal movement speed; if the subcarrier spacing smaller than the subcar
  • the method further includes: informing the user terminals within the coverage of the any one wave beam of the configured preamble formats being updated when the preamble formats configured for the user terminals within a coverage of the any one wave beam are updated for the any one wave beam.
  • the method further includes: informing the user terminals within the base station coverage of the configured preamble formats being updated when the preamble formats configured for the user terminals within the base station coverage are updated.
  • the method further includes: updating the physical random access channel resources that have been configured for the user terminals within the coverage of the any one wave beam when the any one wave beam satisfies a corresponding fifth pre-configured condition, and informing the user terminals within the coverage of the any one wave beam of the updated physical random access channel resources; and/or updating the preamble resource pools that have been configured for the user terminals within the coverage of the any one wave beam when the any one wave beam satisfies a corresponding sixth pre-configured condition, and informing the user terminals within the coverage of the any one wave beam of the updated preamble resource pools.
  • the physical random access channel resources that have been configured for the user terminals within the coverage of the any one wave beam are updated according to a current load situation of the any one wave beam, when the any one wave beam satisfies a corresponding fifth pre-configured condition; and/or the preamble resource pools that have been configured for user terminals within the coverage of the any one wave beam are updated according to the current load situation of the any one wave beam, when the any one wave beam satisfies a corresponding sixth pre-configured condition.
  • the number of preamble sequences in the preamble resource pools configured for user terminals within the coverage is more; and if the current load is lighter, the number of preamble sequences in the preamble resource pools configured for user terminals within the coverage is less.
  • the method further includes: every time updating to be the number of the preamble sequences in the preamble resource pools configured for the user terminals within the coverage, changing the preamble sequence start indexes corresponding to the preamble resource pools at the same time, wherein the preamble sequences in the preamble resource pools are determined according to the number of preamble sequences in the preamble resource pools and the preamble sequence start indexes.
  • the physical random access channel resources configured for the user terminals within the coverage on the same time frequency resources are more; and if the current load is lighter, physical random access channel resources configured for user terminals within a coverage on the same time frequency resources are less.
  • more physical random access channel resources are configured on the same time frequency resources by configuring more concentrated physical random access channels on the same time domain resources and/or configuring more concentrated physical random access channels on the same frequency domain resources; and less physical random access channel resources are configured on the same time frequency resources by configuring more sparse physical random access channels on the same time domain resources and/or configuring more sparse physical random access channels on the same frequency domain resources.
  • the method further includes: informing the user terminals within the coverage of the any one wave beam of that the configured physical random access channel resources and/or the preamble resource pools have been updated when the physical random access channel resources and/or the preamble resource pools configured for the user terminals within the coverage of the any one wave beam are updated for the any one wave beam.
  • the method further includes: informing the user terminals within the base station coverage of that the configured physical random access channel resources and/or the preamble resource pools have been updated when the physical random access channel resources and/or the preamble resource pools configured for the user terminals within the base station coverage are updated.
  • a random access method which includes: (A) acquiring physical random access channel configuration indexes corresponding to both of preamble formats and physical random access channel resources configured by a current base station and information indicating the configured preamble resource pools; (B) determining the corresponding preamble formats and physical random access channel resources according to a carrier frequency range of the base station and the acquired physical random access channel configuration indexes based on a physical random access channel configuration index table; (C) determining the corresponding preamble resource pools according to the information indicating the configured preamble resource pools, and randomly selecting preamble sequences with equal probability from the determined preamble resource pools; (D) generating random access signals based on the selected preamble sequences according to the determined preamble formats ; and (E) transmitting the generated random access signals according to the determined physical random access channel resources.
  • combinations composed of the respective preamble formats and each of their own corresponding physical random access channel configurations are ordered according to the corresponding carrier frequency ranges, and the physical random access channel configuration indexes of the combinations that correspond to the any one carrier frequency range are successively continuous non-negative integers starting from 0.
  • the method further includes: after the step (E), when a new random access procedure starts after the current random access attempt fails , determining whether the current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools; and returning to step (A) when it is determined that the current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools.
  • whether the current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools is determined according to the information, informed by the current base station, which indicates that the configured preamble formats, physical random access channel resources and preamble resource pools have been updated.
  • the method further includes: after the step (E), when a new random access procedure starts after the current random access attempt fails , returning to step (A).
  • parameters for characterizing the preamble formats include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number, wherein the subcarrier spacing determines a subsequence length; or parameters for characterizing the preamble formats include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number; and a subsequence length and/or a sequence repetition number within a subsequence, wherein the subcarrier spacing determines the subsequence length.
  • the step (B) includes: determining the corresponding preamble formats, physical random access channel resources and waveforms used by the uplink sharing channels according to the carrier frequency range of a current base station and the acquired physical random access channel configuration indexes based on the physical random access channel configuration index table, wherein the method further includes: transmitting message 3 according to the waveforms used by the determined uplink sharing channels.
  • a device for configuring random access resources which includes: a preamble format configuration module to configure preamble formats for user terminals within a base station coverage according to a carrier frequency range of the base station; a channel resource configuration module to configure physical random access channel resources for the user terminals within the base station coverage; a resource pool configuration module to configure preamble resource pools for the user terminals within the base station coverage; and a informing module to inform the user terminals within the base station coverage of the configured preamble formats, physical random access channel resources and preamble resource pools.
  • parameters for characterizing the preamble formats include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number, wherein the subcarrier spacing determines a subsequence length; or parameters for characterizing the preamble formats include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number; and a subsequence length and/or a sequence repetition number within the subsequence, wherein the subcarrier spacing determines the subsequence length.
  • the informing module informs the user terminals of the preamble format index corresponding to the configured preamble formats in a preamble format index table, wherein the preamble format index table includes subcarrier spacings, and the preamble format indexes of respective preamble formats are successively continuous non-negative integers starting from 0 in the preamble format index table; and/or informs the user terminals of the preamble format index corresponding to the configured preamble formats in the preamble format index table, wherein in the preamble format index table, indexes of combination composed of respective preamble formats and each of waveforms used by their own corresponding uplink sharing channels are successively continuous non-negative integers starting from 0.
  • the informing module informs the user terminals of the physical random access channel configuration index corresponding to both of the configured preamble formats and physical random access channel resources in the physical random access channel configuration index table, wherein in the physical random access channel configuration index table, combinations composed of respective preamble formats and each of their own corresponding physical random access channel configurations are ordered according to the corresponding carrier frequency ranges, and the physical random access channel configuration indexes of the combinations that correspond to the any one carrier frequency range are successively continuous non-negative integers starting from 0.
  • the informing module informs the user terminals of an available physical random access channel configuration index table for the base station and indexes corresponding to both of the configured preamble formats and physical random access channel resources in the available physical random access channel configuration index table, wherein in the available physical random access channel configuration index table, the indexes of the combinations composed of respective available preamble formats of the base station and each of their own corresponding physical random access channel configurations are successively continuous non-negative integers starting from 0.
  • the informing module informs the user terminals of the number of preamble sequences in the configured preamble resource pools and preamble sequence start indexes of the configured preamble resource pools, wherein the preamble sequences in the preamble resource pools are determined according to the number of preamble sequences in the preamble resource pools and preamble sequence start indexes.
  • the preamble format configuration module configures preamble formats for the user terminals within the base station coverage according to a carrier frequency range, a coverage requirement and a requirement for combating delay spread of multi-path channel of the base station.
  • the channel resource configuration module configures physical random access channel resources for the user terminals within the base station coverage according to a load situation of the base station; and/or the resource pool configuration module configures preamble resource pools for the user terminals within the base station coverage according to a load situation of the base station.
  • the preamble format configuration module updates the preamble formats that have been configured for the user terminals within the base station coverage when a first pre-configured condition is satisfied; and the informing module informs the user terminals within the base station coverage of the updated preamble formats.
  • the preamble format configuration module updates the preamble formats that have been configured for the user terminals within the base station coverage according to the information indicating a wireless channel environment within the base station coverage during a current predetermined time period, when a first pre-configured condition is satisfied.
  • the device further includes: the channel resource configuration module further to update the physical random access channel resources that have been configured for the user terminals within the base station coverage when a second pre-configured condition is satisfied, wherein the informing module informs the user terminals within the base station coverage of the updated physical random access channel resources; and/or the resource pool configuration module updates the preamble resource pools that have been configured for the user terminals within the base station coverage when a third pre-configured condition is satisfied, wherein the informing module informs the user terminals within the base station coverage of the updated preamble resource pools.
  • the channel resource configuration module updates the physical random access channel resources that have been configured for the user terminals within the base station coverage according to the current load situation of the base station, when a second pre-configured condition is satisfied; and/or the resource pool configuration module updates the preamble resource pools that have been configured for the user terminals within the base station coverage according to the current load situation of the base station, when a third pre-configured condition is satisfied.
  • the preamble format configuration module configures the preamble formats for the user terminals within the coverage of each of the wave beams according to a coverage requirement of each of the wave beams, a requirement for combating delay spread of multi-path channel and a carrier frequency range of the base station; for each of the wave beams, the channel resource configuration module configures the physical random access channel resources for the user terminals within the coverage of each of the wave beams; and for each of the wave beams, the resource pool configuration module configures the preamble resource pools for the user terminals within the coverage of each of the wave beams.
  • the channel resource configuration module configures the physical random access channel resources for the user terminals within the coverage of each of the wave beams according to a load situation of each of the wave beams; and/or for each of the wave beams, the resource pool configuration module configures the preamble resource pools for the user terminals within the coverage of each of the wave beams according to the load situation of each of the wave beams.
  • the preamble format configuration module updates the preamble formats that have been configured for the user terminals within the coverage of the any one wave beam when the any one wave beam satisfies a corresponding fourth pre-configured condition; and the informing module informs the user terminals within the coverage of the any one wave beam of the updated preamble formats.
  • the preamble format configuration module updates the preamble formats that have been configured for the user terminals within the coverage of the any one wave beam according to the information indicating a wireless channel environment within the coverage of the any one wave beam during the current predetermined time period, when the any one wave beam satisfies a corresponding fourth pre-configured condition.
  • the information indicating the wireless channel environment within the coverage during the current predetermined time period is obtained by performing statistics on channel state information and/or uplink channel measurement results fed back by connected user terminals within the coverage during the current predetermined time period.
  • the information indicating the wireless channel environment within the coverage during the current predetermined time period includes at least one of the following items: the maximum uplink channel time delay spread obtained according to uplink channel measurement results during a current predetermined time period; the maximum path loss obtained according to uplink channel measurement results during a current predetermined time period or measurement reports fed back by user terminals; the maximum Doppler frequency shift obtained according to uplink channel measurement results during a current predetermined time period or user terminal mobility information in measurement reports fed back by user terminals during a current predetermined time period; and the maximum link budget obtained according to uplink channel measurement results during a current predetermined time period or measurement reports fed back by user terminals.
  • the preamble format configuration module updates the preamble formats that have been configured for the user terminals through at least one of the following patterns: if a cyclic prefix length in the configured preamble formats cannot satisfy the maximum uplink channel time delay spread, the configured preamble formats are updated to satisfy the preamble formats of the maximum uplink channel time delay spread; if a cyclic prefix length shorter than the cyclic prefix length in the configured preamble formats can satisfy the maximum uplink channel time delay spread, the configured preamble formats are updated to the preamble formats corresponding to the shorter cyclic prefix length; if the maximum path loss is greater than the path loss supported by the configured preamble formats, the configured preamble formats are updated to the preamble formats that can support the maximum path loss; if the configured preamble formats cannot satisfy the maximum user terminal movement speed determined according to the maximum Doppler frequency shift or the user terminal mobility information, the configured preamble formats are updated to the preamble formats that can satisfy the maximum user terminal movement speed; if the subcar
  • the informing module further informs the user terminals within the coverage of the any one wave beam of that the configured preamble formats have been updated when the preamble formats configured for the user terminals within the coverage of the any one wave beam are updated for the any one wave beam.
  • the informing module informs the user terminals within the base station coverage of that the configured preamble formats have been updated when the preamble formats configured for the user terminals within the base station coverage are updated.
  • the channel resource configuration module further updates the physical random access channel resources that have been configured for the user terminals within the coverage of the any one wave beam when the any one wave beam satisfies a corresponding fifth pre-configured condition, wherein the informing module informs the user terminals within the coverage of the any one wave beam of the updated physical random access channel resources; and/or the resource pool configuration module updates the preamble resource pools that have been configured for the user terminals within the coverage of the any one wave beam when the any one wave beam satisfies a corresponding sixth pre-configured condition, wherein the informing module informs the user terminals within the coverage of the any one wave beam of the updated preamble resource pools.
  • the channel resource configuration module updates the physical random access channel resources that have been configured for the user terminals within the coverage of the any one wave beam according to a current load situation of the any one wave beam, when the any one wave beam satisfies a corresponding fifth pre-configured condition; and/or the resource pool configuration module updates the preamble resource pools that have been configured for the user terminals within the coverage of the any one wave beam according to a current load situation of the any one wave beam, when the any one wave beam satisfies a corresponding sixth pre-configured condition.
  • the number of preamble sequences in the preamble resource pools configured by the resource pool configuration module for the user terminals within the coverage is more; and if the current load is lighter, the number of preamble sequences in the preamble resource pools configured by the resource pool configuration module for the user terminals within the coverage is less.
  • the resource pool configuration module every time updates to be the number of preamble sequences in the preamble resource pools configured for the user terminals within the coverage, changes the preamble sequence start indexes corresponding to the preamble resource pools at the same time, wherein the preamble sequences in the preamble resource pools are determined according to the number of preamble sequences in the preamble resource pools and preamble sequence start indexes.
  • the current load is heavier, physical random access channel resources configured by the channel resource configuration module for the user terminals within the coverage on the same time frequency resources are more; and if the current load is lighter, the physical random access channel resources configured by the channel resource configuration module for the user terminals within the coverage on the same time frequency resources are less.
  • the channel resource configuration module configures more physical random access channel resources on the same time frequency resources by configuring more concentrated physical random access channels on the same time domain resources and/or configuring more concentrated physical random access channels on the same frequency domain resources; and configures less physical random access channel resources on the same time frequency resources by configuring more sparse physical random access channels on the same time domain resources and/or configuring more sparse physical random access channels on the same frequency domain resources.
  • the informing module informs the user terminals within the coverage of the any one wave beam of that the configured physical random access channel resources and/or the preamble resource pools have been updated when the physical random access channel resources and/or preamble resource pools configured for the user terminals within the coverage of the any one wave beam are updated for the any one wave beam.
  • the informing module informs the user terminals within the base station coverage of that the configured physical random access channel resources and/or preamble resource pools have been updated when the physical random access channel resources and/or preamble resource pools configured for the user terminals within the base station coverage are updated.
  • a random access device which includes: a random access configuration acquisition module to acquire the physical random access channel configuration index corresponding to both of the preamble formats and physical random access channel resources configured by the base station and information indicating the configured preamble resource pools; a configuration module to determine the corresponding preamble formats and physical random access channel resources according to the carrier frequency range of a base station and the acquired physical random access channel configuration index based on a physical random access channel configuration index table; a preamble acquisition module to determine the corresponding preamble resource pools according to the information indicating the configured preamble resource pools, and randomly select the preamble sequences with equal probability from the determined preamble resource pools; a random access signal generation module to generate random access signals based on the selected preamble sequences according to the determined preamble formats ; and a random signal transmission module to transmit the generated random access signals according to the determined physical random access channel resources.
  • combinations composed of respective preamble formats and each of their own corresponding physical random access channel configurations are ordered according to corresponding carrier frequency ranges, and the physical random access channel configuration indexes of the combinations that correspond to the any one carrier frequency range are successively continuous non-negative integers starting from 0.
  • the device further includes: a determination module to determine whether the base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools when a new random access procedure starts after the current random access attempt fails, wherein the base station is determined to have updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools, and returns to the random access configuration acquisition module to re-acquire the physical random access channel configuration index corresponding to both of the configured preamble formats and physical random access channel resources of a base station and information indicating the configured preamble resource pools.
  • the determination module determines whether the current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools according to the information, updated informed by the current base station, which indicates that the configured preamble formats, physical random access channel resources and preamble resource pools have been.
  • the device further includes: when a new random access procedure starts after the current random access attempt fails , the determination module returns to a random access configuration acquisition module to re-acquire the physical random access channel configuration index corresponding to both of the configured preamble formats and physical random access channel resources of the base station and information indicating the configured preamble resource pools.
  • parameters for characterizing the preamble formats include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number, wherein the subcarrier spacing determines a subsequence length; or parameters for characterizing the preamble formats include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number; and a subsequence length and/or a sequence repetition number within a subsequence, wherein the subcarrier spacing determines a subsequence length.
  • the configuration module determines the corresponding preamble formats, physical random access channel resources and waveforms used by uplink sharing channels according to the carrier frequency range of a current base station and the acquired physical random access channel configuration index based on the physical random access channel configuration index table, wherein the device further includes: a transmission module to transmit message 3 according to the waveforms used by the determined uplink sharing channels.
  • a method and a device for configuring random access resources, a random access method and a device provide the preamble formats suitable for different operating frequency bands to satisfy requirements for random access processes in a high frequency band and a low frequency band in a 5G system, and can provide the more precise coverage capability support and also can dynamically update the configured preamble formats, physical random access channel resources and preamble resource pools can be according to a wireless channel environment and a load situation, thereby improving an operation efficiency of the system, and providing the configurations of random access preamble sequences and random access channels which are more flexible and more suitable for different scenes and different channel conditions for a multi wave beam operation system.
  • Various embodiments of the present disclosure provide an improved system performance.
  • FIG. 1 illustrates a wireless communication system according to various embodiments of the present disclosure
  • FIG. 2 illustrates a base station in the wireless communication system according to various embodiments of the present disclosure
  • FIG. 3 illustrates a terminal in the wireless communication system according to various embodiments of the present disclosure
  • FIG. 4 illustrates the communication interface in the wireless communication system according to various embodiments of the present disclosure
  • FIG. 5 illustrates a flow diagram of a method for configuring random access resources in accordance with exemplary embodiments of the present invention
  • FIG. 6 illustrates an example of a structure for random access channels in accordance with exemplary embodiments of the present invention
  • FIG. 7 illustrates another example of a structure for random access channels in accordance with exemplary embodiments of the present invention.
  • FIG. 8 illustrates an example of a high frequency band indoor coverage scene in accordance with exemplary embodiments of the present invention
  • FIG. 9 illustrates an example of a configuration pattern for physical random access channel resources in accordance with exemplary embodiments of the present invention.
  • FIG. 10 illustrates an example of adopting mutually orthogonal time resources in accordance with exemplary embodiments of the present invention
  • FIG. 11 illustrates an example of adopting mutually orthogonal frequency resources in accordance with exemplary embodiments of the present invention
  • FIG. 12 illustrates a flow diagram of a random access method in accordance with exemplary embodiments of the present invention
  • FIG. 13 illustrates a block diagram of a device for configuring random access resources in accordance with exemplary embodiments of the present invention.
  • FIG. 14 illustrates a block diagram of a random access device in accordance with exemplary embodiments of the present invention.
  • the present disclosure describes technology for configuring random access resources and performing random access in a wireless communication system.
  • FIG. 1 illustrates a wireless communication system according to various embodiments of the present disclosure.
  • a base station (BS) 110 a terminal 120, and a terminal 130 are illustrated as the part of nodes using a wireless channel in a wireless communication system.
  • FIG. 1 illustrates only one BS, but another BS, which is the same as or similar to the BS 110, may be further included.
  • the BS 110 is network infrastructure that provides wireless access to the terminals 120 and 130.
  • the BS 110 has coverage defined as a predetermined geographical region based on the distance at which a signal can be transmitted.
  • the BS 110 may be referred to as "access point (AP),” “eNodeB (eNB),” “5th generation (5G) node,” “wireless point,” “transmission/reception Point (TRP)” as well as “base station.”
  • Each of the terminals 120 and 130 is a device used by a user, and performs communication with the BS 110 through a wireless channel. Depending on the case, at least one of the terminals 120 and 130 may operate without user involvement. That is, at least one of the terminals 120 and 130 is a device that performs machine-type communication (MTC) and may not be carried by the user.
  • MTC machine-type communication
  • Each of the terminals 120 and 130 may be referred to as "user equipment (UE),” “mobile station,” “subscriber station,” “remote terminal,” “wireless terminal,” or “user device” as well as “terminal.”
  • the BS 110, the terminal 120, and the terminal 130 may transmit and receive wireless signals in millimeter wave (mmWave) bands (for example, 28 GHz, 30 GHz, 38 GHz, and 60 GHz).
  • mmWave millimeter wave
  • the BS 110, the terminal 120, and the terminal 130 may perform beamforming.
  • the beamforming may include transmission beamforming and reception beamforming. That is, the BS 110, the terminal 120, and the terminal 130 may assign directivity to a transmission signal and a reception signal.
  • the BS 110 and the terminals 120 and 130 may select serving beams 112, 113, 121, and 131 through a beam search procedure or a beam management procedure. After that, communications may be performed using resources having a quasi co-located relationship with resources carrying the serving beams 112, 113, 121, and 131.
  • a first antenna port and a second antenna ports are considered to be quasi co-located if the large-scale properties of the channel over which a symbol on the first antenna port is conveyed can be inferred from the channel over which a symbol on the second antenna port is conveyed.
  • the large-scale properties may include one or more of delay spread, doppler spread, doppler shift, average gain, average delay, and spatial Rx parameters.
  • FIG. 2 illustrates the BS in the wireless communication system according to various embodiments of the present disclosure.
  • a structure exemplified at FIG. 2 may be understood as a structure of the BS 110.
  • the term "-module”, “-unit” or “-er” used hereinafter may refer to the unit for processing at least one function or operation and may be implemented in hardware, software, or a combination of hardware and software.
  • the BS may include a wireless communication interface 210, a backhaul communication interface 220, a storage unit 230, and a controller 240.
  • the wireless communication interface 210 performs functions for transmitting and receiving signals through a wireless channel.
  • the wireless communication interface 210 may perform a function of conversion between a baseband signal and bitstreams according to a physical layer standard of the system.
  • the wireless communication interface 210 in data transmission, the wireless communication interface 210 generates complex symbols by encoding and modulating transmission bitstreams. Further, in data reception, the wireless communication interface 210 reconstructs reception bitstreams by demodulating and decoding the baseband signal.
  • the wireless communication interface 210 up-converts the baseband signal into an Radio Frequency (RF) band signal, transmits the converted signal through an antenna, and then down-converts the RF band signal received through the antenna into the baseband signal.
  • the wireless communication interface 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog convertor (DAC), an analog-to-digital convertor (ADC), and the like.
  • the wireless communication interface 210 may include a plurality of transmission/reception paths.
  • the wireless communication interface 210 may include at least one antenna array consisting of a plurality of antenna elements.
  • the wireless communication interface 210 may include a digital unit and an analog unit, and the analog unit may include a plurality of sub-units according to operation power, operation frequency, and the like.
  • the digital unit may be implemented as at least one processor (e.g., a digital signal processor (DSP)).
  • DSP digital signal processor
  • the wireless communication interface 210 transmits and receives the signal as described above. Accordingly, the wireless communication interface 210 may be referred to as a "transmitter” a “receiver,” or a “transceiver.” Further, in the following description, transmission and reception performed through the wireless channel may be used to have a meaning including the processing performed by the wireless communication interface 210 as described above.
  • the backhaul communication interface 220 provides an interface for performing communication with other nodes within the network. That is, the backhaul communication interface 220 converts bitstreams transmitted to another node, for example, another access node, another BS, a higher node, or a core network, from the BS into a physical signal and converts the physical signal received from the other node into the bitstreams.
  • another node for example, another access node, another BS, a higher node, or a core network
  • the storage unit 230 stores a basic program, an application, and data such as setting information for the operation of the BS 110.
  • the storage unit 230 may include a volatile memory, a non-volatile memory, or a combination of volatile memory and non-volatile memory. Further, the storage unit 230 provides stored data in response to a request from the controller 240.
  • the controller 240 controls the general operation of the BS. For example, the controller 240 transmits and receives a signal through the wireless communication interface 210 or the backhaul communication interface 220. Further, the controller 240 records data in the storage unit 230 and reads the recorded data.
  • the controller 240 may performs functions of a protocol stack that is required from a communication standard. According to another implementation, the protocol stack may be included in the wireless communication interface 210. To this end, the controller 240 may include at least one processor.
  • the controller 240 may determine preamble formats for a terminal according to a carrier frequency range of the base station, determine physical random access channel resources for the terminal, determine preamble resource pools for the terminal, and transmit, to the terminal, a message for informing at least one of the preamble formats, the physical random access channel resources, and the preamble resource pools.
  • the controller 240 may control the base station to perform operations according to the exemplary embodiments of the present disclosure.
  • FIG. 3 illustrates the terminal in the wireless communication system according to various embodiments of the present disclosure.
  • a structure exemplified at FIG. 3 may be understood as a structure of the terminal 120 or the terminal 130.
  • the term "-module”, “-unit” or “-er” used hereinafter may refer to the unit for processing at least one function or operation, and may be implemented in hardware, software, or a combination of hardware and software.
  • the terminal 120 includes a communication interface 310, a storage unit 320, and a controller 330.
  • the communication interface 310 performs functions for transmitting/receiving a signal through a wireless channel. For example, the communication interface 310 performs a function of conversion between a baseband signal and bitstreams according to the physical layer standard of the system. For example, in data transmission, the communication interface 310 generates complex symbols by encoding and modulating transmission bitstreams. Also, in data reception, the communication interface 310 reconstructs reception bitstreams by demodulating and decoding the baseband signal. In addition, the communication interface 310 up-converts the baseband signal into an RF band signal, transmits the converted signal through an antenna, and then down-converts the RF band signal received through the antenna into the baseband signal. For example, the communication interface 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC.
  • the communication interface 310 may include a plurality of transmission/reception paths.
  • the communication interface 310 may include at least one antenna array consisting of a plurality of antenna elements.
  • the wireless communication interface 210 may include a digital circuit and an analog circuit (for example, a radio frequency integrated circuit (RFIC)).
  • the digital circuit and the analog circuit may be implemented as one package.
  • the digital circuit may be implemented as at least one processor (e.g., a DSP).
  • the communication interface 310 may include a plurality of RF chains.
  • the communication interface 310 may perform beamforming.
  • the communication interface 310 transmits and receives the signal as described above. Accordingly, the communication interface 310 may be referred to as a "transmitter,” a “receiver,” or a “transceiver.” Further, in the following description, transmission and reception performed through the wireless channel is used to have a meaning including the processing performed by the communication interface 310 as described above.
  • the storage unit 320 stores a basic program, an application, and data such as setting information for the operation of the terminal 120.
  • the storage unit 320 may include a volatile memory, a non-volatile memory, or a combination of volatile memory and non-volatile memory. Further, the storage unit 320 provides stored data in response to a request from the controller 330.
  • the controller 330 controls the general operation of the terminal 120. For example, the controller 330 transmits and receives a signal through the communication interface 310. Further, the controller 330 records data in the storage unit 320 and reads the recorded data.
  • the controller 330 may performs functions of a protocol stack that is required from a communication standard. According to another implementation, the protocol stack may be included in the communication interface 310. To this end, the controller 330 may include at least one processor or microprocessor, or may play the part of the processor. Further, the part of the communication interface 310 or the controller 330 may be referred to as a communication processor (CP).
  • CP communication processor
  • the controller 330 may acquire physical random access channel configuration index corresponding to preamble formats and physical random access channel resources determined by a base station and information indicating preamble resource pools, determine the preamble formats and the physical random access channel resources according to a carrier frequency range of the base station and the acquired physical random access channel configuration index, based on a physical random access channel configuration index table, determine preamble resource pools according to the information indicating the preamble resource pools and determining preamble sequences with equal probability from the determined preamble resource pools, generate random access signals based on the preamble sequences according to the preamble formats, and transmit the random access signals according to the physical random access channel resources.
  • the controller 330 may control the terminal to perform operations according to the exemplary embodiments of the present disclosure.
  • FIG. 4 illustrates the communication interface in the wireless communication system according to various embodiments of the present disclosure.
  • FIG. 4 shows an example for the detailed configuration of the communication interface 210 of FIG. 2 or the communication interface 310 of FIG. 3. More specifically, FIG. 4 shows elements for performing beamforming as part of the communication interface 210 of FIG. 2 or the communication interface 310 of FIG. 3.
  • the communication interface 210 or 310 includes an encoding and circuitry 402, a digital circuitry 404, a plurality of transmission paths 406-1 to 406-N, and an analog circuitry 408.
  • the encoding and circuitry 402 performs channel encoding.
  • a low-density parity check (LDPC) code For the channel encoding, at least one of a low-density parity check (LDPC) code, a convolution code, and a polar code may be used.
  • the encoding and circuitry 402 generates modulation symbols by performing constellation mapping.
  • LDPC low-density parity check
  • the digital circuitry 404 performs beamforming for a digital signal (for example, modulation symbols). To this end, the digital circuitry 404 multiples the modulation symbols by beamforming weighted values.
  • the beamforming weighted values may be used for changing the size and phrase of the signal, and may be referred to as a "precoding matrix" or a "precoder.”
  • the digital circuitry 404 outputs the digitally beamformed modulation symbols to the plurality of transmission paths 406-1 to 406-N.
  • the modulation symbols may be multiplexed, or the same modulation symbols may be provided to the plurality of transmission paths 406-1 to 406-N.
  • MIMO multiple input multiple output
  • the plurality of transmission paths 406-1 to 406-N convert the digitally beamformed digital signals into analog signals.
  • each of the plurality of transmission paths 406-1 to 406-N may include an inverse fast Fourier transform (IFFT) calculation unit, a cyclic prefix (CP) insertion unit, a DAC, and an up-conversion unit.
  • the CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) scheme, and may be omitted when another physical layer scheme (for example, a filter bank multi-carrier: FBMC) is applied. That is, the plurality of transmission paths 406-1 to 406-N provide independent signal processing processes for a plurality of streams generated through the digital beamforming. However, depending on the implementation, some of the elements of the plurality of transmission paths 406-1 to 406-N may be used in common.
  • OFDM orthogonal frequency division multiplexing
  • the analog circuitry 408 performs beamforming for analog signals. To this end, the digital circuitry 404 multiples the analog signals by beamforming weighted values. The beamformed weighted values are used for changing the size and phrase of the signal. More specifically, according to a connection structure between the plurality of transmission paths 406-1 to 406-N and antennas, the analog circuitry 408 may be configured in various ways. For example, each of the plurality of transmission paths 406-1 to 406-N may be connected to one antenna array. In another example, the plurality of transmission paths 406-1 to 406-N may be connected to one antenna array. In still another example, the plurality of transmission paths 406-1 to 406-N may be adaptively connected to one antenna array, or may be connected to two or more antenna arrays.
  • FIG. 5 illustrates a flow diagram of a method for configuring random access resources in accordance with exemplary embodiments of the present invention.
  • preamble formats are configured for user terminals within a base station coverage according to a carrier frequency range of the base station.
  • the preamble formats may be configured for the user terminals within the base station coverage according to the carrier frequency range, a coverage requirement and a requirement for combating delay spread of multi-path channel of the base station.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing; a cyclic prefix (CP) length; a preamble sequence length and/or a subsequence repetition number, wherein the subcarrier spacing determines a subsequence length.
  • CP cyclic prefix
  • FIG. 6 illustrates an example of a structure for random access channels in accordance with exemplary embodiments of the present invention.
  • random access channels may be composed of a CP, non-repeated preamble subsequences or preamble subsequence repeated for many times and a guard time (GT).
  • the length of the GT is determined by a data channel symbol length, a preamble sequence length and a CP length.
  • k is a positive integer larger than 1, and k satisfies: k (data channel symbol length) ⁇ (CP length+preamble sequence length) ⁇ (k+1) (data channel symbol length), then the length of the GT is: (k+1) (data channel symbol length)-CP length-preamble sequence length.
  • a subcarrier spacing used by physical random access channels may determine a length of a time domain subsequence (that is, a subsequence length); the repetition number of subsequences may determine a length of a total time domain preamble sequence (that is, a preamble sequence length); the CP length and the length of the total time domain preamble sequence may determine a length of a time domain random access signal.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing, a cyclic prefix length and a subsequence repetition number.
  • Table 1 illustrates one example of a preamble format index table, wherein T s represents a sample interval, the CP length may be measured by using a multiple of a sample interval, and k i is a positive integer larger than 1.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing, a cyclic prefix length and a preamble sequence length.
  • Table 2 illustrates another example of a preamble format index table, wherein the preamble sequence length may be measured by using a multiple of a sample interval, wherein n i is a positive integer larger than 1.
  • the preamble sequence length (or the subsequence repetition number) and the CP length corresponding to each of preamble formats system parameters, such as the maximum cell radius, the maximum link budget, the maximum channel multi-path time delay spread, the maximum Doppler frequency shift and the like, supported by each of preamble formats can be determined.
  • FIG. 7 illustrates another example of a structure for random access channels in accordance with exemplary embodiments of the present invention.
  • random access channels may be composed of a plurality of preamble subsequences or a plurality of preamble subsequence repeats, and each of preamble subsequences may be composed of a plurality of sequences or a plurality of sequence repeats between two adjacent cyclic prefixes.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing for determining a preamble subsequence length; a CP length; a sequence repetition number (or a preamble subsequence length) within a preamble subsequence for determining the constitution of preamble subsequences; and a preamble subsequence repetition number (or a preamble sequence length) for determining the structure of preamble sequences.
  • Tables 3 and 4 illustrate one example of a preamble format index table, respectively.
  • e i is a positive integer larger than
  • f i is a positive integer larger than 0
  • h i is a positive integer larger than 0.
  • the preamble sequence length (or the preamble subsequence repetition number), each of the preamble subsequence lengths (or the sequence repetition number within each of preamble subsequences) and the CP length corresponding to each of the preamble formats
  • system parameters such as the maximum cell radius, the maximum link budget, the maximum channel multi-path time delay spread, the maximum Doppler frequency shift and the like, supported by each of the preamble formats can be determined.
  • the subcarrier spacings of the data channels need to be an integer multiple of the subcarrier spacings of the physical random access channels.
  • the reference subcarrier spacing of the physical random access channel is defined as 1.25kHz, which corresponds to a subcarrier spacing of 15kHz of the data channel.
  • the subcarrier spacing of the physical random access channel thereof is an integer multiple of the reference subcarrier spacing
  • different carrier frequency ranges correspond to multiples of the corresponding reference subcarrier spacings
  • each of carrier frequency ranges may correspond to at least one subcarrier spacing.
  • Table 5 illustrates a possible correspondence between subcarrier spacings of the physical random access channels and the carrier frequency ranges.
  • a i represents a multiple of a subcarrier spacing and is a positive integer not less than 1, although Table 5 only illustrates that one carrier frequency range corresponds to a multiple of one reference subcarrier spacing, it should be understood that each of the carrier frequency ranges may correspond to a multiple of at least one reference subcarrier spacing, m i represents a preamble format index (for example, the preamble format index shown in Tables 1-4) and is a positive integer not less than 0.
  • different carrier frequency ranges correspond to multiples of the corresponding reference subcarrier spacings and correspond to the preamble format index ranges having the preamble formats of the corresponding subcarrier spacings
  • the preamble formats that correspond to different carrier frequency ranges may be different (as shown in Table 5)
  • preamble formats that correspond to different carrier frequency ranges may also be partially overlapped
  • the preamble formats that correspond to all the carrier frequency ranges are all possible preamble formats.
  • the respective preamble formats may be ordered according to the sizes of the subcarrier spacings, and the respective preamble formats are numbered as indexes, the preamble format indexes of the respective preamble formats are successively continuous non-negative integers starting from 0.
  • the preamble format index table is shown in Tables 1-4.
  • the respective preamble formats may be ordered according to the CP length, or the respective preamble formats may be ordered according to the preamble sequence lengths/the subsequence repetition number or according to the preamble subsequence lengths/the sequence repetition number within the preamble subsequences.
  • the preamble format indexes corresponding to each of the carrier frequency ranges in Table 5 are not continuous, that is, preamble format indexes corresponding to each of the carrier frequency ranges are discrete values.
  • a preamble format index table shown in Table 6 can be obtained by combining Table 2 and Table 5.
  • the same carrier frequency range may correspond to at least one subcarrier spacing
  • the same carrier frequency range corresponds to a plurality of preamble formats
  • these preamble formats may use the same or different subcarrier spacings, use the same or different preamble sequence lengths (or subsequence repetition numbers) and use the same or different CP lengths.
  • step S20 the physical random access channel resources are configured for the user terminals within the base station coverage.
  • the physical random access channel resources are configured for the user terminals within the base station coverage according to a load situation of the base station.
  • step S30 the preamble resource pools are configured for the user terminals within the base station coverage.
  • the preamble resource pools are configured for the user terminals within the base station coverage according to a load situation of the base station.
  • step S40 user terminals within the base station coverage are informed of the configured preamble formats, physical random access channel resources and preamble resource pools.
  • the user terminals within a base station coverage may be informed of the information indicating the configured preamble formats (for example, preamble format indexes), information indicating the configured physical random access channel resources (for example, physical random access channel configuration indexes) and the information indicating the configured preamble resource pools (for example, information indicating the number of preamble sequences in the configured preamble resource pools).
  • the configured preamble formats for example, preamble format indexes
  • information indicating the configured physical random access channel resources for example, physical random access channel configuration indexes
  • the information indicating the configured preamble resource pools for example, information indicating the number of preamble sequences in the configured preamble resource pools.
  • the user terminals within the base station coverage may be informed of the random access configuration information and the information indicating the configured preamble resource pools, wherein the random access configuration information may indicate the configured preamble formats and physical random access channel configurations, for example, random access configuration information may be the physical random access channel configuration indexes (as shown in Table 7).
  • the user terminals may be informed of the number of the preamble sequences in the configured preamble resource pools and the preamble sequence start indexes of the configured preamble resource pools to inform the user terminals of the configured preamble resource pools, wherein the preamble sequences in the preamble resource pools are determined according to the number of preamble sequences and preamble sequence start indexes in the preamble resource pools.
  • the user terminals within the base station coverage may be informed of the configured preamble formats, physical random access channel resources and preamble resource pools in main information blocks or system information blocks indicated by main information blocks in broadcast channels.
  • the user terminals may be informed of the preamble format index corresponding to the configured preamble formats in a preamble format index table.
  • the configured preamble formats may be indicated by informing the preamble format index.
  • the user terminals may be informed of the physical random access channel configuration index corresponding to both of the configured preamble formats and physical random access channel resources in a physical random access channel configuration index table.
  • both of the configured preamble formats and the configured physical random access channel resources may be indicated by informing the physical random access channel configuration index.
  • each preamble format corresponds to a plurality of the physical random access channel configurations, and the physical random access channel configurations corresponding to different preamble formats (or preamble format indexes) are not overlapped.
  • Such a configuration pattern is similar to a preamble format configuration pattern in LTE.
  • possible preamble formats may be many, such that the number of possible physical random access channel configurations is also many, which results in comparatively large signaling overhead.
  • combinations composed of respective preamble formats and each of their own corresponding physical random access channel configurations are ordered according to corresponding carrier frequency ranges, combinations corresponding to the same carrier frequency ranges are ordered together and for a combination corresponding to each of carrier frequency ranges respectively, respective combined physical random access channel configuration indexes are successively continuous non-negative integers starting from 0, that is, the physical random access channel configuration indexes corresponding to the any one carrier frequency range are continuous non-negative integers starting from 0.
  • each preamble format (or preamble format index) corresponding to the same carrier frequency range corresponds to a plurality of the physical random access channel configurations; the physical random access channel configurations corresponding to different preamble formats (or preamble format indexes) which correspond to the same carrier frequency range are not overlapped; and combinations of the preamble formats (or preamble format indexes) corresponding to different carrier frequency ranges and physical random access channel configurations multiplexes the same physical random access channel configuration indexes.
  • only physical random access channel configuration indexes are multiplexed in different carrier frequency ranges, instead of specific physical random access channel configurations being multiplexed.
  • Table 7 shows a possible example of such a configuration pattern, in Table 7, the preamble formats are represented by the corresponding preamble format indexes.
  • the user terminals may acquire the carrier frequency ranges of a base station when making a cell selection and/or implementing downlink synchronization, as a result, the base station only inform the user terminals of the physical random access channel configuration index.
  • the user terminals can acquire the configured preamble formats (or preamble format indexes) and the physical random access channel configurations based on the acquired carrier frequency ranges of the base station and the physical random access channel configuration indexes, if the preamble format indexes are acquired, the preamble formats corresponding to the preamble format indexes may be acquired further through the corresponding preamble format index table.
  • the user terminals are informed of an available physical random access channel configuration index table for the base station and the indexes corresponding to both of the configured preamble formats and the physical random access channel resources in the available physical random access channel configuration index table, wherein in the available physical random access channel configuration index table, the indexes of the combinations composed of the respective available preamble formats of the base station and each of their own corresponding physical random access channel configurations are successively continuous non-negative integers starting from 0.
  • a base station may predetermine several combinations of available preamble formats and corresponding physical random access channel configurations within the present cell and number them as indexes to form an available physical random access channel configuration index table for the base station.
  • Table 8 shows an example of an available physical random access channel configuration index table for a base station
  • Table 8 shows a mapping relationship between the available physical random access channel configuration index (it can be seen according to Table 7 of the previous embodiment that preamble formats and physical random access channel resources may be determined after physical random access channel configuration indexes are defined) of a base station and renumbered the indexes, wherein d i is an integer not less than 0 and represents a physical random access channel configuration index which may be continuous and may also be discontinuous, and different physical random access channel configurations correspond to different coverage levels/link budgets/the supported maximum time delay spread and a load situation.
  • user terminals within the base station coverage may be informed of the available physical random access channel configuration index table for the base station through main information blocks or system information blocks indicated by main information blocks in public broadcast channels (the used wave beam sharing).
  • the renumbered indexes as shown in Table 8 may only be informed when informing configured preamble formats and physical random access channel resources.
  • the random access preamble formats may be bound with waveforms (that is, a transmission waveform used by message 3) used by the uplink sharing channels.
  • waveforms that is, a transmission waveform used by message 3 used by the uplink sharing channels.
  • an uplink communication is based on the CP-OFDM waveform, but in some extreme coverage situations, the DFT-s-OFDM waveform may be still adopted to improve emission power by reducing a peak-to-average ratio, thereby improving a coverage capability of uplink data transmission (message 3).
  • the waveform adopted by message 3 also needs to be determined.
  • an uplink waveform adopted by message 3 may further be implicitly informed through the configuration of preamble formats.
  • a waveform used by at least one uplink sharing channel that each preamble format can use may be set through a preset pattern.
  • a preamble format index table may be formed, wherein indexes of the combinations composed of the respective preamble formats and each of waveforms used by their own corresponding uplink sharing channels are successively continuous nonnegative integers starting from 0.
  • Table 9 shows an example of message 3 transmission waveforms corresponding to different preamble format indexes.
  • preamble format indexes can also indicate waveforms used by message 3 transmission.
  • a base station may determine the preamble formats within each wave beam coverage and may further determine waveforms used by uplink sharing channels according to information such as a load situation and a channel situation and the like within each reception wave beam coverage.
  • the user terminals within the wave beam coverage are informed of the preamble format index corresponding to both of the configured preamble formats and waveforms used by uplink sharing channels in the preamble format index table through the main information blocks or the system information blocks indicated by the main information blocks in broadcast channels.
  • the user terminals may generate the preamble sequences according to the preamble format requirements corresponding to the preamble format indexes after reading the preamble format indexes and transmit the preamble sequences in random access channels.
  • the user terminals may use message 3 transmission waveforms corresponding to the configured preamble format indexes of the base station after detecting a random access response and use the corresponding waveforms to transmit message 3 on uplink resources assigned in the random access response.
  • a wave beam forming technique For a system running in a high frequency band, a wave beam forming technique needs to be used to overcome significant path loss due to restrictions on such as a channel condition and the like.
  • a base station adopts a multi wave beam operation, that is, a wave beam only covers a comparatively small range, and the coverage of an area is finished through a plurality of the wave beams.
  • the coverage capabilities required by different wave beams thereof are different.
  • FIG. 8 illustrates an example of a high frequency band indoor coverage scene in 5G in accordance with exemplary embodiments of the present invention.
  • a base station composed of a plurality of antenna modules are uniformly distributed indoor.
  • a plurality of base station devices are disposed indoor at the equal interval. But even if being arranged at the equal interval, the coverage requirement of the same base station device in different directions are also different. For example, a coverage requirement in a direction against wall is greater than the coverage requirements in other directions. In consideration of factors such as indoor shielding and an indoor environment, the coverage requirements of the same base station device in different directions are also different.
  • the same scene also occurs in a high frequency band outdoor coverage scene.
  • the coverage requirements thereof in different directions are also different.
  • the coverage requirements of different wave beams are different.
  • step S10 may include: for each of wave beams adopted by a base station, configuring the preamble formats for the user terminals within the coverage of each of the wave beams according to the coverage requirement of each of the wave beams, the requirement for combating delay spread of multi-path channel and the carrier frequency range of the base station. That is, for different wave beams of the same base station, different random access preamble formats may be configured to adapt to the coverage requirements of different wave beams, the requirement for combating delay spread of multi-path channel and the like.
  • the wave beams having a great coverage requirement may adopt the preamble formats in which the subsequence repetition number is many (or a preamble sequence length is long) and a CP length is long; while the wave beams having a low coverage requirement may adopt the preamble formats in which the subsequence repetition number is few (or a preamble sequence length is short) and a CP length is short.
  • the preamble formats that is, preamble formats configured for user terminals within different wave beam coverages
  • used by different wave beams may be determined according to the information about a cell topology structure and periphery geographic situations of a cell base station during a cell deployment phase and the like.
  • step S20 may include: for each of the wave beams, configuring the physical random access channel resources for the user terminals within the coverage of each of the wave beams.
  • the physical random access channel resources are configured for the user terminals within the coverage of each of the wave beams according to a load situation of each of the wave beams.
  • step S30 may include: for each of the wave beams, configuring the preamble resource pools for the user terminals within the coverage of each of the wave beams.
  • the preamble resource pools are configured for the user terminals within the coverage of each of the wave beams according to a load situation of each of the wave beams.
  • the method for configuring random access resources in accordance with exemplary embodiments of the present invention may further include: updating the preamble formats that have been configured for the user terminals within the base station coverage when a first pre-configured condition is satisfied; and informing the user terminals within the base station coverage of the updated preamble formats.
  • the preamble formats that have been configured for the user terminals within the base station coverage are updated according to the information indicating a wireless channel environment within the base station coverage during the current predetermined time period, when a first pre-configured condition is satisfied.
  • the first pre-configured condition may be a arrival of a updating period and may also be that the parameters of a wireless channel environment of the base station are higher or lower than a corresponding threshold.
  • the method for configuring random access resources in accordance with exemplary embodiments of the present invention may further include: informing the user terminals within the base station coverage of that the configured preamble formats have been updated when the preamble formats configured for the user terminals within the base station coverage are updated.
  • the method for configuring random access resources in accordance with exemplary embodiments of the present invention may further include: updating the preamble formats that have been configured for the user terminals within the coverage of any one wave beam when the any one wave beam satisfies a corresponding fourth pre-configured condition; and informing the user terminals within the coverage of the any one wave beam of the updated preamble formats.
  • the preamble formats that have been configured for the user terminals within the coverage of any one wave beam may be updated according to the information indicating a wireless channel environment within the coverage of the any one wave beam during a current predetermined time period, when the any one wave beam satisfies a corresponding fourth pre-configured condition.
  • the fourth pre-configured condition corresponding to any one wave beam may be a arrival of a updating period and may also indicate that parameters of a wireless channel environment of the wave beam are higher or lower than a corresponding threshold .
  • the method for configuring random access resources in accordance with exemplary embodiments of the present disclosure may further include: informing the user terminals within the coverage of any one wave beam of that the configured preamble formats have been updated when the preamble formats configured for the user terminals within the coverage of the any one wave beam are updated for the any one wave beam.
  • the configured preamble formats may be indicated to be updated through downlink control channels, downlink sharing channels or 1 bit information in broadcast channels.
  • the information indicating a wireless channel environment within a base station coverage (any one wave beam of a base station) during a current predetermined time period may be obtained by performing statistics on channel state information and/or uplink channel measurement results fed back by connected user terminals within the base station coverage (or any one wave beam of a base station) during the current predetermined time period.
  • the information indicating a wireless channel environment within the base station coverage (or any wave beam of a base station) during the current predetermined time period includes at least one of the following items:
  • the preamble formats that have been configured for the user terminals with the base station coverage may be updated through at least one of the following patterns:
  • the configured preamble formats may be updated to satisfy the preamble formats of the maximum uplink channel time delay spread.
  • the configured preamble formats may be updated to the preamble formats corresponding to the shorter cyclic prefix length.
  • the configured preamble formats may be updated to the preamble formats that can support the maximum path loss.
  • the configured preamble formats may be updated to be preamble formats in which the CP length is longer and the GT length is longer.
  • the configured preamble formats may be updated to the preamble formats that can satisfy the maximum user terminal movement speed.
  • the configured preamble formats may be updated to be preamble formats corresponding to larger subcarrier spacings.
  • the configured preamble formats may be updated to the preamble formats corresponding to the smaller subcarrier spacing.
  • the configured preamble formats may be updated to the preamble formats that can satisfy the maximum link budget.
  • the configured preamble formats may be updated to be preamble formats in which the preamble sequence length is longer or the subsequence repetition number is more.
  • the configured preamble formats may be updated to the preamble formats corresponding to the shorter preamble sequence length and/or the less subsequence repetition number.
  • the configured preamble formats may be updated to the preamble formats corresponding to the shorter subsequence length and/or the less sequence repetition number in a subsequence.
  • preamble formats corresponding to a base station change, if the user terminals before and after the changed node does not read system information timely, loss or conflict of random access signals may possibly occur.
  • the user terminals needs to be informed when preamble formats are updated such that the user terminals can read information indicating new preamble formats (that is, updated preamble formats) before trying a new random access process.
  • the user terminals may first detect whether preamble formats are updated while trying a random access process.
  • random access configuration information carried by main information blocks or system information blocks indicated by the main information blocks in broadcast channels may be read for a new random access process; If preamble formats are not detected to be updated, random access configuration information used in a previous random access procedure is used.
  • the user terminals may be set to re-read random access configuration information carried by main information blocks or system information blocks indicated by the main information blocks in broadcast channels every time a random access procedure is tried, and use the read configuration information to initiate a random access process.
  • Such a pattern can save some signaling overhead, but operations at a user side are a little more complicated.
  • the method for configuring random access resources in accordance with exemplary embodiments of the present invention may further include: updating the physical random access channel resources that have been configured for user terminals within a base station coverage when a second pre-configured condition is satisfied, and informing the user terminals within the base station coverage of the updated physical random access channel resources.
  • the method for configuring random access resources in accordance with exemplary embodiments of the present invention may further include: updating the preamble resource pools that have been configured for the user terminals within the base station coverage when a third pre-configured condition is satisfied, and informing the user terminals within the base station coverage of the updated preamble resource pools.
  • the physical random access channel resources that have been configured for the user terminals within the base station coverage may be updated according to a current load situation of the base station, when a second pre-configured condition is satisfied.
  • the preamble resource pools that have been configured for the user terminals within the base station coverage may be updated according to a current load situation of the base station, when a third pre-configured condition is satisfied.
  • the second pre-configured condition may be a arrival of a updating period and may also be that the number of the user terminals of the current access base station is higher or lower than a corresponding threshold.
  • the third pre-configured condition may be a arrival of a updating period and may also be that the number of the user terminals of the current access base station is higher or lower than a corresponding threshold.
  • the method for configuring random access resources in accordance with exemplary embodiments of the present invention may further include: informing the user terminals within the base station coverage of that the configured physical random access channel resources and/or preamble resource pools have been updated when the physical random access channel resources and/or preamble resource pools configured for the user terminals within the base station coverage are updated.
  • the method for configuring random access resources in accordance with exemplary embodiments of the present invention may further include: updating the physical random access channel resources that have been configured for the user terminals within the coverage of any one wave beam when the any one wave beam satisfies a corresponding fifth pre-configured condition, and informing the user terminals within the coverage of the any one wave beam of the updated physical random access channel resources.
  • the method for configuring random access resources in accordance with exemplary embodiments of the present invention may further include: updating the preamble resource pools that have been configured for the user terminals within the coverage of any one wave beam when the any one wave beam satisfies a corresponding sixth pre-configured condition, and informing the user terminals within the coverage of the any one wave beam of the updated preamble resource pools.
  • the physical random access channel resources that have been configured for the user terminals within the coverage of any one wave beam may be updated according to a current load situation of the any one wave beam, when the any one wave beam satisfies a corresponding fifth pre-configured condition.
  • the preamble resource pools that have been configured for the user terminals within the coverage of any one wave beam may be updated according to a current load situation of the any one wave beam, when the any one wave beam satisfies a corresponding sixth pre-configured condition.
  • the fifth pre-configured condition corresponding to each wave beam may be a arrival of a updating period and may also be that the number of the user terminals which currently access to the wave beam is higher or lower than a corresponding threshold.
  • the sixth pre-configured condition corresponding to each wave beam may be a arrival of a updating period and may also be that the number of user terminals which currently access to the wave beam is higher or lower than a corresponding threshold.
  • the user terminals within the coverage of any one wave beam may be informed of that the configured physical random access channel resources and/or the preamble resource pools have been updated when the physical random access channel resources and/or the preamble resource pools configured for the user terminals within the coverage of the any one wave beam are updated for the any one wave beam.
  • the current load situation of a wave beam may be mainly measured through the number of the user terminals currently accessed within the wave beam.
  • the configured physical random access channel resources and/or the preamble resource pools may be indicated to be updated through downlink control channels, downlink sharing channels or 1 bit information in broadcast channels.
  • a multi wave beam operation is adopted to compensate for path loss.
  • probabilities of generating conflicts due to initializing random access by the user terminals within different wave beams during random access are also different, it is necessary to assign different preamble resource pools and/or physical random access channel resources for the user terminals within different wave beam coverages.
  • the information indicating the number of preamble sequences in preamble resource pools may be carried, so that the configured preamble resource pools may be informed of the user terminals through the information indicating the number of preamble sequences in the preamble resource pools, the preamble sequences in the configured preamble resource pools are preamble sequences that correspond to a preamble sequence index 0 (that is, a default preamble sequence start index) to a preamble sequence index (numberOfRA-Preambles -1).
  • the number of preamble sequences in the preamble resource pools configured for the user terminals within the base station coverage (or any one wave beam) is more; and if the current load of a base station (or any one wave beam of a base station) is lighter, the number of preamble sequences in the preamble resource pools configured for the user terminals within the base station coverage (or any one wave beam) is less.
  • step S40 in random access configuration information carried by main information blocks or system information blocks indicated by the main information blocks in broadcast channels, information indicating the number of the preamble sequences in the preamble resource pools (for example, indicating by signaling numberOfRA-Preambles) and the preamble sequence start indexes (for example, indicating by using signaling numberOfRA-Preambles) may be carried, so that the configured preamble resource pools may be informed of the user terminals through the information indicating the number of preamble sequences in the preamble resource pools and the preamble sequence start indexes, the preamble sequences in the configured preamble resource pools are the preamble sequences that correspond to a preamble sequence start index (start Of RA-Preamble) to a preamble sequence end index (startOfRA-Preamble + numberOfRA-Preambles -1).
  • the preamble sequence start indexes corresponding to the preamble resource pools are changed at the same time, wherein the preamble sequences in the preamble resource pools are determined according to the number of preamble sequences in the preamble resource pools and preamble sequence start indexes.
  • the current load of the base station (or any one wave beam of a base station) is heavier, physical random access channel resources configured for the user terminals within a base station coverage (or any one wave beam of a base station) on the same time frequency resources are more; and if the current load of the base station (or any one wave beam of a base station) is lighter, the physical random access channel resources configured for the user terminals within the base station coverage (or any one wave beam of a base station) on the same time frequency resources are less.
  • FIG. 9 illustrates an example of different configuration patterns for the physical random access channel resources on time domain in accordance with exemplary embodiments of the present invention.
  • the user terminals when the physical random access channel resources and/or the preamble resource pools corresponding to the base station (or the same wave beam) change over time, if user terminals before and after the changed node does not read system information timely, loss or conflict of random access signals may possibly occur.
  • the user terminals needs to be informed when physical random access channel resources and/or preamble resource pools are updated such that the user terminals can read information indicating new physical random access channel resources and/or information indicating preamble resource pools before trying a new random access process.
  • the user terminals may first detect whether the preamble resource pools and the physical random access channel resources are changed while trying a random access process.
  • the random access configuration information and information indicating preamble resource pools carried by main information blocks or system information blocks indicated by the main information blocks in broadcast channels may be read for a new random access process. If the preamble resource pools or the physical random access channel resources are not detected to be changed, the random access configuration information and the information indicating the preamble resource pools used in a previous random access procedure are used.
  • the user terminals may be set to re-read the information indicating the random access resource pools and the random access configuration information carried by main information blocks or system information blocks indicated by the main information blocks in broadcast channels every time a random access procedure is tried, and use the read configuration information to initiate a random access process.
  • Such a pattern can save some signaling overhead, but operations at a user side are a little more complicated.
  • the preamble resource pools and/or the physical random access channel resources corresponding to different wave beams may be different to adapt to different load situations within different wave beam coverages.
  • the base station may simultaneously detect load situations within a plurality of wave beam coverages, and dynamically adjust physical random access channel configuration indexes corresponding to the respective wave beams and/or the number of available preamble sequences in preamble resource pools according to load situations.
  • the base station may inform information about the number of preamble sequences in preamble resource pools and physical random access channel resources and the like in main information blocks or system information blocks indicated by main information blocks in broadcast channels of synchronizing signal blocks corresponding to transmission (or reception) wave beams at each base station side or in the corresponding downlink broadcast channels thereof.
  • time frequency positions of the physical random access channels within different wave beam coverages may be possibly different.
  • the random access channels within the wave beam coverage having a heavier load are distributed more concentrated on time frequency resources, while the random access channels within the wave beam coverage having a lighter load are distributed more sparse on time frequency resources.
  • the physical random access channels within different wave beam coverages shall make interference generated among different channels as little as possible, as an example, the physical random access channels within different wave beam coverages may adopt mutually orthogonal time resources and/or mutually orthogonal frequency resources.
  • FIG. 10 illustrates an example of adopting mutually orthogonal time resources in accordance with exemplary embodiments of the present invention.
  • physical random access channels that correspond to synchronizing signal blocks (or downlink broadcast channels, not shown in the figure) adopting different emission wave beams may be distinguished through a time division mode.
  • synchronizing signal blocks or downlink broadcast channels, not shown in the figure
  • different random access channels do not generate interference.
  • FIG. 11 illustrates an example of adopting mutually orthogonal frequency resources in accordance with exemplary embodiments of the present invention.
  • physical random access channels that correspond to synchronizing signal blocks (or downlink broadcast channels, not shown in the figure) adopting different emission wave beams may be distinguished through a frequency division mode.
  • synchronizing signal blocks or downlink broadcast channels, not shown in the figure
  • different physical random access channels do not generate interference.
  • physical random access channel configurations within different emission wave beam coverages may also be distinguished by a time division mode or a frequency division mode.
  • Embodiments 3 and 4 introduce a pattern of updating the preamble formats and a pattern of updating the physical random access channel resources and/or the preamble resource pools, respectively. It should be understood that in an actual system, the preamble formats, the physical random access channel resources and the preamble resource pools corresponding to wave beams may be adjusted simultaneously according to changes of a transmission environment and a load situation of a wireless channel.
  • the base station may update the physical random access channel configuration indexes of each wave beam and the number of the preamble sequences in the preamble resource pools according to a wireless communication channel environment and a load situation within each wave beam coverage.
  • the base station may inform the physical random access channel configuration index required within the wave beam coverage and information indicating the number of preamble sequences in preamble resource pools in main information blocks or system information blocks indicated by main information blocks in synchronizing channels or broadcast channels corresponding to each transmission wave beam (or reception wave beam).
  • FIG. 12 illustrates a flow diagram of a random access method in accordance with exemplary embodiments of the present invention.
  • step S50 the physical random access channel configuration index corresponding to both of the configured preamble formats and physical random access channel resources of a current base station and information indicating the configured preamble resource pools are acquired.
  • user terminals may determine an optimal synchronizing channel (that is, determining an optimal emission wave beam defense line of a base station) according to a synchronizing signal reception strength, and read the physical random access channel configuration indexes and the information indicating preamble resource pools from main information blocks or system information blocks indicated by main information blocks in a broadcast channel corresponding to the optimal synchronizing channel.
  • an optimal synchronizing channel that is, determining an optimal emission wave beam defense line of a base station
  • step 60 the corresponding preamble formats and physical random access channel resources are determined according to the carrier frequency range of a base station and the acquired physical random access channel configuration index, based on a physical random access channel configuration index table.
  • combinations composed of respective preamble formats and each of their own corresponding physical random access channel configurations are ordered according to corresponding carrier frequency ranges, and combined physical random access channel configuration indexes that correspond to any one carrier frequency range are successively continuous non-negative integers starting from 0.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number, wherein the subcarrier spacing determines a subsequence length.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number; and a subsequence length and/or a sequence repetition number within a subsequence, wherein the subcarrier spacing determines a subsequence length.
  • the corresponding preamble formats, physical random access channel resources and waveforms used by uplink sharing channels may be determined according to the carrier frequency range of the current base station and the acquired physical random access channel configuration index, based on the physical random access channel configuration index table, wherein the random access method according to exemplary embodiments of the present disclosure may further include: transmitting message 3 according to the waveforms used by the determined uplink sharing channels.
  • step S70 the corresponding preamble resource pools are determined according to the information indicating the configured preamble resource pools, and the preamble sequences are randomly selected with equal probability from the determined preamble resource pools.
  • step S80 the random access signals are generated according to the determined preamble formats based on the selected preamble sequences.
  • step S90 the generated random access signals are transmitted according to the determined physical random access channel resources.
  • the random access method in accordance with exemplary embodiments of the present invention may further include: after the step S90, when a new random access procedure starts after the current random access attempt fails, determining whether the current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools; and returning to step S50 when it is determined that the current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools.
  • whether the current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools may be determined according to the information, informed by the current base station, which indicates that the configured preamble formats, physical random access channel resources and preamble resource pools have been updated.
  • the random access method in accordance with exemplary embodiments of the present invention may further include: after the step S90, when a new random access procedure starts after the current random access attempt fails , returning to step S50.
  • FIG. 13 illustrates a block diagram of a device for configuring random access resources in accordance with exemplary embodiments of the present invention.
  • the device for configuring random access resources in accordance with exemplary embodiments of the present invention includes: a preamble format configuration module 10, a channel resource configuration module 20 and a resource pool configuration module 30 and a informing module 40.
  • the preamble format configuration module 10 is used to configure the preamble formats for the user terminals within the base station coverage according to a carrier frequency range of the base station.
  • the preamble format configuration module 10 may configure preamble formats for the user terminals within the base station coverage according to the carrier frequency range, a coverage requirement and a requirement for combating delay spread of multi-path channel of the base station.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number, wherein the subcarrier spacing determines a subsequence length.
  • parameters for characterizing preamble formats may include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number; and a subsequence length and/or a sequence repetition number within a subsequence, wherein the subcarrier spacing determines a subsequence length.
  • the channel resource configuration module 20 is used to configure physical random access channel resources for the user terminals within the base station coverage.
  • the channel resource configuration module 20 may configure the physical random access channel resources for the user terminals within the base station coverage according to a load situation of the base station.
  • the resource pool configuration module 30 is used to configure preamble resource pools for the user terminals within the base station coverage.
  • the resource pool configuration module 30 configures the preamble resource pools for the user terminals within the base station coverage according to the load situation of the base station.
  • the informing module 40 is used to inform the user terminals within the base station coverage of the configured preamble formats, physical random access channel resources and preamble resource pools.
  • the informing module 40 may inform the user terminals of the preamble format index corresponding to the configured preamble formats in a preamble format index table, wherein in the preamble format index table, respective preamble formats are ordered according to sizes of subcarrier spacings, and preamble format indexes of respective preamble formats are successively continuous non-negative integers starting from 0.
  • the informing module 40 may inform the user terminals of the preamble format index corresponding to the configured preamble formats in a preamble format index table, wherein in the preamble format index table, indexes of combinations composed of respective preamble formats and each of waveforms used by their own corresponding uplink sharing channels are successively continuous non-negative integers starting from 0.
  • the informing module 40 may inform the user terminals of the physical random access channel configuration index corresponding to both of the configured preamble formats and physical random access channel resources in the physical random access channel configuration index table, wherein in the physical random access channel configuration index table, combinations composed of respective preamble formats and each of their own corresponding physical random access channel configurations are ordered according to corresponding carrier frequency ranges, and physical random access channel configuration indexes of combinations that correspond to any one carrier frequency range are successively continuous non-negative integers starting from 0.
  • the informing module 40 may inform the user terminals of an available physical random access channel configuration index table for a base station and indexes corresponding to both of the configured preamble formats and physical random access channel resources in the available physical random access channel configuration index table, wherein in the available physical random access channel configuration index table, indexes of the combinations composed of respective available preamble formats of the base station and each of their own corresponding the physical random access channel configurations are successively continuous non-negative integers starting from 0.
  • the informing module 40 may inform the user terminals of the number of preamble sequences in the configured preamble resource pools and preamble sequence start indexes of the configured preamble resource pools, wherein the preamble sequences in the preamble resource pools can be determined according to the number of preamble sequences in the preamble resource pools and the preamble sequence start indexes.
  • the preamble format configuration module 10 may further update the preamble formats that have been configured for the user terminals within the base station coverage when a first pre-configured condition is satisfied, wherein the informing module 40 informs the user terminals within the base station coverage of the updated preamble formats.
  • the preamble format configuration module 10 may update the preamble formats that have been configured for the user terminals within the base station coverage according to the information indicating a wireless channel environment within the base station coverage during a current predetermined time period, when a first pre-configured condition is satisfied.
  • the informing module 40 may further inform the user terminals within the base station coverage of that the configured preamble formats has been updated when the preamble formats configured for the user terminals within the base station coverage are updated.
  • the channel resource configuration module 20 may further update the physical random access channel resources that have been configured for the user terminals within the base station coverage when a second pre-configured condition is satisfied, wherein the informing module 40 informs the user terminals within the base station coverage of the updated physical random access channel resources.
  • the channel resource configuration module 20 may update the physical random access channel resources that have been configured for the user terminals within the base station coverage according to a current load situation of the base station, when a second pre-configured condition is satisfied.
  • the resource pool configuration module 30 may further update the preamble resource pools that have been configured for the user terminals within the base station coverage when a third pre-configured condition is satisfied, wherein the informing module 40 informs the user terminals within the base station coverage of the updated preamble resource pools.
  • the resource pool configuration module 30 may update the preamble resource pools that have been configured for the user terminals within the base station coverage according to a current load situation of the base station, when a third pre-configured condition is satisfied.
  • the informing module 40 may inform the user terminals within the base station coverage of that the configured physical random access channel resources and/or preamble resource pools have been updated when the physical random access channel resources and/or preamble resource pools that configured for the user terminals within the base station coverage are updated.
  • the preamble format configuration module 10 may configure the preamble formats for the user terminals within the coverage of each of the wave beams according to a coverage requirement of each of the wave beams, a requirement for combating delay spread of multi-path channel and a carrier frequency range of the base station; for each of the wave beams, the channel resource configuration module 20 may configure the physical random access channel resources for the user terminals within the coverage of each of the wave beams; and for each of the wave beams, the resource pool configuration module 30 may configure the preamble resource pools for the user terminals within the coverage of each of the wave beams.
  • the channel resource configuration module 20 may configure the physical random access channel resources for user terminals within a coverage of each of the wave beams according to a load situation of each of the wave beams.
  • the resource pool configuration module 30 may configure the preamble resource pools for the user terminals within the coverage of each of the wave beams according to a load situation of each of the wave beams.
  • the preamble format configuration module 10 may further update the preamble formats that have been configured for the user terminals within the coverage of any one wave beam when the any one wave beam satisfies a fourth pre-configured condition, wherein the informing module 40 informs user terminals within the coverage of the any one wave beam of the updated preamble formats.
  • the preamble format configuration module 10 may update the preamble formats that have been configured for the user terminals within the coverage of any one wave beam according to the information indicating a wireless channel environment within the coverage of the any one wave beam during a current predetermined time period, when the any one wave beam satisfies a corresponding fourth pre-configured condition.
  • the information indicating a wireless channel environment within the coverage during a current predetermined time period may be obtained by performing statistics on channel state information and/or uplink channel measurement results that fed back by connected user terminals within the coverage during the current predetermined time period.
  • the information indicating a wireless channel environment within the coverage during the current predetermined time period may include at least one of the following items: the maximum uplink channel time delay spread obtained according to uplink channel measurement results during a current predetermined time period; the maximum path loss obtained according to uplink channel measurement results during a current predetermined time period or measurement reports fed back by the user terminals; the maximum Doppler frequency shift obtained according to uplink channel measurement results during a current predetermined time period or user terminal mobility information in measurement reports fed back by the user terminals during a current predetermined time period; and the maximum link budget obtained according to uplink channel measurement results during a current predetermined time period or measurement reports fed back by the user terminals.
  • the preamble format configuration module 10 may update preamble formats that have been configured for the user terminals through at least one of the following patterns: if a cyclic prefix length in the configured preamble formats cannot satisfy the maximum uplink channel time delay spread, the configured preamble formats are updated to satisfy the preamble formats that can satisfy the maximum uplink channel time delay spread; if a cyclic prefix length shorter than a cyclic prefix length in the configured preamble formats can satisfy the maximum uplink channel time delay spread, the configured preamble formats are updated to the preamble formats corresponding to the shorter cyclic prefix length; if the maximum path loss is greater than the path loss supported by the configured preamble formats, the configured preamble formats are updated to the preamble formats that can support the maximum path loss; if the configured preamble formats cannot satisfy the maximum user terminal movement speed determined according to the maximum Doppler frequency shift or the user terminal mobility information, the configured preamble formats are updated to the preamble formats that can satisfy the maximum user terminal movement speed;
  • the informing module 40 may further inform the user terminals within the coverage of any one wave beam of that the configured preamble formats have been updated when the preamble formats configured for the user terminals within the coverage of the any one wave beam are updated for the any one wave beam.
  • the channel resource configuration module 20 may further update the physical random access channel resources that have been configured for the user terminals within the coverage of any one wave beam when the any one wave beam satisfies a corresponding fifth pre-configured condition, wherein the informing module 40 may inform the user terminals within the coverage of the any one wave beam of the updated physical random access channel resources.
  • the channel resource configuration module 20 may update the physical random access channel resources that have been configured for the user terminals within the coverage of any one wave beam according to a current load situation of the any one wave beam, when the any one wave beam satisfies a corresponding fifth pre-configured condition.
  • the resource pool configuration module 30 may further update the preamble resource pools that have been configured for the user terminals within the coverage of any one wave beam when the any one wave beam satisfies a corresponding sixth pre-configured condition, wherein the informing module 40 may inform the user terminals within the coverage of the any one wave beam of the updated preamble resource pools.
  • the resource pool configuration module 30 may update the preamble resource pools that have been configured for the user terminals within the coverage of any one wave beam according to a current load situation of the any one wave beam, when the any one wave beam satisfies a corresponding sixth pre-configured condition.
  • the number of preamble sequences in the preamble resource pools that may be configured by the resource pool configuration module 30 for the user terminals within the coverage is more; and if the current load is lighter, the number of the preamble sequences in the preamble resource pools that may be configured by the resource pool configuration module 30 for the user terminals within the coverage is less.
  • the resource pool configuration module 30 every time updates the number of preamble sequences in the preamble resource pools configured for the user terminals within a coverage, and change preamble sequence start indexes corresponding to the preamble resource pools at the same time, wherein the preamble sequences in the preamble resource pools are determined according to the number of preamble sequences in the preamble resource pools and the preamble sequence start indexes.
  • the physical random access channel resources that may be configured by the channel resource configuration module 20 for the user terminals within the coverage on the same time frequency resources are more; and if the current load is lighter, the physical random access channel resources that may be configured by the channel resource configuration module 20 for the user terminals within the coverage on the same time frequency resources are less.
  • the channel resource configuration module 20 may implement to configure more physical random access channel resources on the same time frequency resources by configuring more concentrated physical random access channels on the same time domain resources and/or configuring more concentrated physical random access channels on the same frequency domain resources; and may implement to configure less physical random access channel resources on the same time frequency resources by configuring more sparse physical random access channels on the same time domain resources and/or configuring more sparse physical random access channels on the same frequency domain resources.
  • the informing module 40 may further inform the user terminals within the coverage of any one wave beam of that the configured physical random access channel resources and/or preamble resource pools have been updated when the physical random access channel resources and/or preamble resource pools configured for the user terminals within the coverage of the any one wave beam are updated for the any one wave beam.
  • physical random access channels within different wave beam coverages may adopt mutually orthogonal time resources and/or mutually orthogonal frequency resources.
  • FIG. 14 illustrates a block diagram of a random access device in accordance with exemplary embodiments of the present invention.
  • the random access device in accordance with exemplary embodiments of the present invention includes: a random access configuration acquisition module 50, a configuration module 60, a preamble acquisition module 70, a random access signal generation module 80 and a random signal transmission module 90.
  • the random access configuration acquisition module 50 is used to acquire the physical random access channel configuration index corresponding to both of the preamble formats and the physical random access channel resources configured by a current base station and information indicating the configured preamble resource pools.
  • the configuration module 60 is used to determine corresponding preamble formats and physical random access channel resources according to the acquired carrier frequency range and the physical random access channel configuration index based on a physical random access channel configuration index table.
  • combinations composed of the respective preamble formats and each of their own corresponding physical random access channel configurations are ordered according to corresponding carrier frequency ranges, and the physical random access channel configuration indexes of combinations that correspond to any one carrier frequency range are successively continuous non-negative integers starting from 0.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number, wherein the subcarrier spacing determines a subsequence length.
  • parameters for characterizing the preamble formats may include: a subcarrier spacing; a cyclic prefix length; a preamble sequence length and/or a subsequence repetition number; and a subsequence length and/or a sequence repetition number within a subsequence, wherein the subcarrier spacing determines a subsequence length.
  • the configuration module 60 may determine corresponding preamble formats, physical random access channel resources and waveforms used by uplink sharing channels according to the carrier frequency range of a current base station and the acquired physical random access channel configuration index based on the physical random access channel configuration index table, wherein the random access device according to exemplary embodiments of the present invention may further include: a transmission module (not illustrated) for transmitting message 3 according to the waveforms used by the determined uplink sharing channels.
  • the preamble acquisition module 70 is used to determine corresponding preamble resource pools according to the information indicating the configured preamble resource pools, and randomly select preamble sequences with equal probability from the determined preamble resource pools.
  • the random access signal generation module 80 is used to generate random access signals based on the selected preamble sequences according to the determined preamble formats .
  • the random signal transmission module 90 is used to transmit the generated random access signals according to the determined physical random access channel resources.
  • the random access device in accordance with exemplary embodiments of the present invention may further include: a determination module (not illustrated).
  • the determination module is used to determine whether a current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools when determining that a new random access procedure starts after the current random access attempt fails , wherein when the current base station is determined to have updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools, and returns to the random access configuration acquisition module 50 to re-acquire the physical random access channel configuration index corresponding to both of the preamble formats and physical random access channel resources configured by the base station and information indicating the configured preamble resource pools.
  • the determination module may determine whether the current base station has already updated at least one of the configured preamble formats, physical random access channel resources and preamble resource pools according to the information, updated informed by the current base station, which indicates that the configured preamble formats, physical random access channel resources and preamble resource pools have been.
  • the determination module is used to return to the random access configuration acquisition module 50 to re-acquire the physical random access channel configuration index corresponding to both of the preamble formats and physical random access channel resources configured by the base station and information indicating the configured preamble resource pools.
  • a method and a device for configuring random access resources, a random access method and a device provide preamble formats suitable for different operating frequency bands to satisfy requirements for random access processes in a high frequency band and a low frequency band in a 5G system, and can provide the more precise coverage capability support and also can dynamically update the configured preamble formats, physical random access channel resources and preamble resource pools according to a wireless channel environment and a load situation, thereby improving an operation efficiency of the system, and providing configurations of random access preamble sequences and random access channels which are more flexible and more suitable for different scenes and different channel conditions for a multi wave beam operation system.
  • modules in the device for configuring random access resources and the random access device in accordance with the exemplary embodiments of the present invention can be implemented as hardware components and/or software components.
  • Those skilled in the art may implement respective modules by using, for example, field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC), according to the processes performed by respective defined modules.
  • FPGA field-programmable gate array
  • ASIC application-specific integrated circuit
  • the method for configuring random access resources and the random access method according to the exemplary embodiments of the present invention can be implemented as computer codes on a computer readable recording medium.
  • Those skilled in the art may implement the computer codes according to the description for the above method.
  • the above method of the present invention is implemented when the computer codes are executed in a computer.
  • a computer-readable storage medium for storing one or more programs (software modules) may be provided.
  • the one or more programs stored in the computer-readable storage medium may be configured for execution by one or more processors within the electronic device.
  • the at least one program may include instructions that cause the electronic device to perform the methods according to various embodiments of the present disclosure as defined by the appended claims and/or disclosed herein.
  • the programs may be stored in non-volatile memories including a random access memory and a flash memory, a read only memory (ROM), an electrically erasable programmable read only memory (EEPROM), a magnetic disc storage device, a compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other type optical storage devices, or a magnetic cassette.
  • ROM read only memory
  • EEPROM electrically erasable programmable read only memory
  • CD-ROM compact disc-ROM
  • DVDs digital versatile discs
  • any combination of some or all of the may form a memory in which the program is stored.
  • a plurality of such memories may be included in the electronic device.
  • the programs may be stored in an attachable storage device which is accessible through communication networks such as the Internet, Intranet, local area network (LAN), wide area network (WAN), and storage area network (SAN), or a combination thereof.
  • a storage device may access the electronic device via an external port.
  • a separate storage device on the communication network may access a portable electronic device.
  • a component included in the present disclosure is expressed in the singular or the plural according to a presented detailed embodiment.
  • the singular form or plural form is selected for convenience of description suitable for the presented situation, and various embodiments of the present disclosure are not limited to a single element or multiple elements thereof. Further, either multiple elements expressed in the description may be configured into a single element or a single element in the description may be configured into multiple elements.

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

Abstract

La présente invention se rapporte à un système de communication de pré-5ème génération (5G) ou 5G, apte à prendre en charge des débits de données supérieurs à ceux d'un système de communication de 4ème génération (4G), tel qu'un système d'évolution à long terme (LTE). L'invention concerne un procédé et un dispositif de configuration de ressources d'accès aléatoire, un procédé d'accès aléatoire, et un dispositif. Le procédé de configuration de ressources d'accès aléatoire consiste à : (A) configurer des formats de préambule pour des terminaux d'utilisateur à l'intérieur d'une couverture de station de base selon une plage de fréquences de porteuse de la station de base; (B) configurer des ressources de canal d'accès aléatoire physique pour les terminaux d'utilisateur à l'intérieur de la couverture de station de base; (C) configurer des groupes de ressources de préambule pour les terminaux d'utilisateur à l'intérieur de la couverture de station de base; et (D) informer les terminaux d'utilisateur à l'intérieur de la couverture de station de base des formats de préambules, des ressources de canal d'accès aléatoire physique et des réserves de ressources de préambule configurés. Le procédé et le dispositif selon l'invention peuvent configurer des formats de préambule appropriés pour les terminaux d'utilisateur sur la base de bandes de fréquences de fonctionnement de la station de base, et satisfaire ainsi différentes exigences dans différentes bandes de fréquences de fonctionnement.
PCT/KR2018/000490 2017-01-13 2018-01-10 Procédé et appareil de configuration de ressources d'accès aléatoire, et procédé et appareil d'accès aléatoire WO2018131891A1 (fr)

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CN201710184595.4A CN108307506B (zh) 2017-01-13 2017-03-24 配置随机接入资源的方法和装置及随机接入方法和装置

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