WO2017054288A1 - Procédé de mesurage de porteuse basé sur une bande de fréquences sans licence, et station de base - Google Patents

Procédé de mesurage de porteuse basé sur une bande de fréquences sans licence, et station de base Download PDF

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Publication number
WO2017054288A1
WO2017054288A1 PCT/CN2015/093540 CN2015093540W WO2017054288A1 WO 2017054288 A1 WO2017054288 A1 WO 2017054288A1 CN 2015093540 W CN2015093540 W CN 2015093540W WO 2017054288 A1 WO2017054288 A1 WO 2017054288A1
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Prior art keywords
base station
cell
carrier
rssi
user equipments
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PCT/CN2015/093540
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English (en)
Chinese (zh)
Inventor
乔粱
李明菊
张晨璐
朱亚军
张云飞
雷艺学
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宇龙计算机通信科技(深圳)有限公司
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Publication of WO2017054288A1 publication Critical patent/WO2017054288A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • 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
    • H04L5/0008—Wavelet-division
    • 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
    • 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
    • H04L5/0057—Physical resource allocation for CQI
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a carrier measurement method and a base station based on an unlicensed frequency band.
  • 3GPP is discussing how to use unlicensed spectrum, such as the 2.4 GHz and 5 GHz bands, with the help of licensed spectrum.
  • unlicensed spectrum are currently mainly used in systems such as Wi-Fi, Bluetooth, radar, and medical.
  • the carrier aggregation feature makes it possible to deploy LTE to unlicensed bands.
  • 3GPP proposes the concept of LAA (Licensed Assisted Access) to use unlicensed spectrum with the help of LTE licensed spectrum. In view of the existence of other access devices including Wi-Fi, Bluetooth, etc. in the unlicensed band, one is used to avoid the radar mechanism, and Dynamic Frequency Selection (DFS) is proposed.
  • LAA Licensed Assisted Access
  • the interference level is ensured.
  • the uplink and downlink transmissions between the base station and the user do not need to consider whether there are base stations or users of the same operator in the vicinity.
  • the DFS algorithm must be implemented taking into account the highest priority of the radar system.
  • LTE requires a DFS mechanism, which is the drawback of existing technologies.
  • the energy detection in the traditional DFS algorithm is based on the active energy detection of RSSI, and the base station performs semi-static periodic energy detection.
  • the problem is that the base station will be on a fixed time period regardless of interference. Energy detection is performed so that the base station must stop normal transmission and reception to perform channel detection, reducing system efficiency.
  • a technical problem to be solved by the embodiments of the present invention is to provide a carrier based on an unlicensed frequency band. Measurement method and base station. The problem that the base station measurement method is inefficient in the prior art can be solved.
  • an embodiment of the present invention provides a carrier measurement method based on an unlicensed frequency band, including:
  • the base station detects an interference situation of the working carrier corresponding to the cell;
  • the base station sends a carrier measurement indication to the multiple user equipments in the cell, where the carrier measurement indication is used to instruct the multiple user equipments to measure the RSSI of the corresponding working carrier. And returning the measured RSSI to the base station;
  • the base station determines, according to the RSSI fed back by the multiple user equipments, whether each user equipment needs to perform carrier switching.
  • the detecting, by the base station, the interference situation of the working carrier corresponding to the cell includes:
  • the base station measures the RSSI of the working carrier corresponding to the cell multiple times within a preset duration
  • the base station averages the measured RSSIs to obtain an average RSSI
  • the sending, by the base station, the carrier measurement indication to the multiple user equipments in the cell includes:
  • the base station sends a carrier measurement indication to multiple user equipments in the cell based on scheduling information of an unlicensed carrier or an authorized carrier or RRC signaling.
  • the determining, by the base station, whether each user equipment needs to perform carrier switching according to the RSSI fed back by the multiple user equipments includes:
  • the base station compares whether the RSSI fed back by each of the multiple user equipments is greater than the preset RSSI threshold
  • the base station indicates that the user equipment whose feedback RSSI is smaller than the preset RSSI threshold performs carrier switching.
  • the interference situation of the base station detecting the working carrier corresponding to the cell includes:
  • the base station acquires CQIs reported by multiple user equipments in the cell;
  • the base station detects an interference situation of a working carrier corresponding to the cell.
  • an embodiment of the present invention further provides a base station, including:
  • the detecting triggering module is configured to detect, if the proportion of the user equipment whose CQI is less than the preset CQI threshold in the cell exceeds a preset value, the interference situation of the working carrier corresponding to the cell;
  • a measurement indication module configured to send a carrier measurement indication to a plurality of user equipments in the cell if the working carrier is strongly interfered, where the carrier measurement indication is used to instruct the multiple user equipments to measure respective working carriers RSSI, and return the measured RSSI to the base station;
  • the switching identification module is configured to determine, according to the RSSI fed back by the multiple user equipments, whether each user equipment needs to perform carrier switching.
  • the detection trigger module is configured to:
  • the measurement indication module is used to:
  • the carrier measurement indication is sent to a plurality of user equipments in the cell based on scheduling information of the unlicensed carrier or the authorized carrier or RRC signaling.
  • the switching identification module is configured to:
  • the user equipment indicating that the feedback RSSI is smaller than the preset RSSI threshold performs carrier switching.
  • the detection trigger module is configured to:
  • the ratio is greater than the preset value, detecting an interference situation of the working carrier corresponding to the cell.
  • the base station evaluates the interference situation of the measured working carrier and the interference of the working carrier measured by the user equipment in the cell to determine whether to perform carrier switching. . In this way, the base station is prevented from periodically performing carrier measurement, and the active detection becomes a triggered passive detection, which reduces the processing overhead of the base station and improves the accuracy of the carrier handover evaluation.
  • FIG. 1 is a schematic flowchart of a carrier measurement method based on an unlicensed frequency band according to an embodiment of the present invention
  • FIG. 2 is another schematic flowchart of a carrier measurement method based on a non-received frequency band according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of interaction of a communication system according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 5 is another schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 1 is a schematic flowchart of a carrier measurement method based on an unlicensed frequency band according to an embodiment of the present disclosure.
  • the method includes:
  • the base station detects an interference situation of the working carrier corresponding to the cell.
  • the base station and the user equipment of the embodiment of the present invention work in a cell in an unlicensed frequency band, that is, a carrier corresponding to the cell, and the working carrier is a carrier currently used by a cell to which the base station belongs. Multiple uses in a small area
  • the CQI Channel Quality Indicator, CQI for short
  • the base station receives the CQIs fed back by multiple user equipments within a preset time period, and compares the received CQIs with the preset CQI thresholds.
  • the base station detects the cell corresponding The interference condition of the working carrier to determine whether the working carrier is subject to strong interference, if strong interference indicates that the working carrier of the base station may need to be handed over.
  • the base station sends a carrier measurement indication to multiple user equipments in the cell, where the carrier measurement indication is used to instruct the multiple user equipments to measure respective working carriers. RSSI and return the measured RSSI to the base station.
  • the base station sends a carrier measurement indication to multiple user equipments in the cell, where the carrier measurement indication may be sent by using a carrier of the licensed frequency band or a carrier of the unlicensed frequency band, for example, by scheduling information or RRC. (Radio Resource Control, Radio Resource Control, RRC for short) signaling carries.
  • the carrier measurement indication is sent to multiple user equipments in the cell, and the multiple user equipments are in the connected user equipment.
  • each user equipment measures the corresponding working carrier to obtain the RSSI of the working carrier.
  • RSSI Received Signal Strength Indicator
  • the base station determines, according to the RSSI fed back by the multiple user equipments, whether each user equipment needs to perform carrier switching.
  • the base station compares the relationship between the RSSI and the preset RSSI threshold of the user equipment, and if it is greater than the RSSI threshold, it indicates that the working carrier on the corresponding user equipment side is also strongly interfered, and the base station only performs carrier switching on the user equipment.
  • the base station evaluates the interference situation of the measured working carrier and the interference of the working carrier measured by the user equipment in the cell. To determine whether to perform carrier switching. In this way, the base station is prevented from periodically performing carrier measurement, and the active detection becomes a triggered passive detection, which reduces the processing overhead of the base station and improves the accuracy of the carrier handover evaluation.
  • FIG. 2 is a schematic flowchart of another method for measuring an unlicensed frequency band carrier according to an embodiment of the present invention.
  • the method includes:
  • the base station acquires a CQI reported by multiple user equipments in the cell.
  • the carrier corresponding to the cell is a carrier of the unlicensed band
  • the plurality of user equipments in the cell indicate the user equipment in the connected state
  • each user equipment reports the CQI to the base station after satisfying a certain reporting condition, for example, the user equipment period.
  • the CQI is reported to the base station or the user equipment reports the CQI before transmitting data to the base station.
  • the base station obtains the CQIs reported by the multiple user equipments in the preset duration.
  • the preset duration can be set as required, and the present invention is not limited.
  • the base station determines the number of user equipments in the cell, and the user equipment is the user equipment in the connected state, and determines whether the CQI is smaller than the preset CQI according to the CQI fed back by the user equipment, and counts the number of user equipments whose CQI is smaller than the preset CQI threshold, and calculates the cell.
  • the preset CQI threshold is 8, and the cell to which the base station belongs has four connected user equipments.
  • the base station obtains the CQIs of the four user equipments, which are 6, 5, 4, and 10, respectively, within the preset duration.
  • S204 is performed, and if the ratio calculated by S202 is not greater than the preset value, S205 is performed.
  • the preset value is 0.5
  • the ratio calculated by S202 is 0.75, 0.75>0.5
  • S204 is executed.
  • the base station measures the RSSI of the working carrier corresponding to the cell multiple times within a preset duration.
  • the duration of the preset duration and the measurement within the preset duration are not limited herein, and may be set as needed.
  • the base station averages the measured RSSIs to obtain an average RSSI.
  • the method for averaging a plurality of RSSIs measured multiple times in S204 is not limited in the present invention, and may be a simple arithmetic mean value, a geometric mean value, a weighted arithmetic mean value, or the like, and may be averaged by other methods.
  • S208 is performed; if the average RSSI calculated by S206 is not greater than the preset RSSI threshold, S209 is performed.
  • the base station determines that the working carrier is strongly interfered, indicating that the service quality degradation of the service may affect the normal operation of the service, and indicates that the user equipment in the cell performs carrier measurement, and further confirms whether carrier switching is required according to the carrier measurement result to ensure the service. Quality of service.
  • the base station sends a carrier measurement indication to the multiple user equipments in the cell according to the scheduling information of the unlicensed carrier or the authorized carrier or the RRC signaling, where the carrier measurement indicates that the user instructs the multiple user equipments to measure the corresponding work.
  • the RSSI of the carrier and return the measured RSSI to the base station.
  • Each user equipment performs multiple measurements on the working carrier within a preset duration, takes the average of multiple measurements, and returns the averaged RSSI to the base station.
  • the specific process may refer to the method of measuring the average RSSI on the base station side.
  • the feedback RSSI is greater than the preset RSSI threshold.
  • the base station compares the RSSI and the preset RSSI threshold value that are fed back by each user equipment. If the RSSI of the feedback is greater than the preset RSSI threshold, the S201 is performed, otherwise, S212 is performed.
  • the base station determines the target carrier to be switched, and sends a carrier switching system that carries the frequency and bandwidth of the target carrier to the user equipment that needs to perform the carrier switching.
  • the user equipment receives the carrier switching indication and switches the current working carrier to the target carrier. .
  • the base station evaluates the interference situation of the measured working carrier and the interference of the working carrier measured by the user equipment in the cell. To determine whether to perform carrier switching. In this way, the base station is prevented from periodically performing carrier measurement, and the active detection becomes a triggered passive detection, which reduces the processing overhead of the base station and improves the accuracy of the carrier handover evaluation.
  • FIG. 3 is a schematic diagram of interaction of a communication system according to an embodiment of the present invention.
  • a communication system includes a base station and at least one user terminal in a cell, and the following is between a base station and a user equipment. The interaction is explained, and the interaction process is as follows:
  • the user equipment reports the CQI to the base station.
  • the multiple user equipments in the cell to which the base station belongs report the CQI to the base station.
  • the base station calculates a proportion of the number of user equipments in which the CQI in the cell is less than a preset threshold.
  • the ratio is the number of user equipments whose CQI in the cell is less than the preset CQI threshold and the number of user equipments in the cell. The ratio of the quantity in which the user equipment is connected.
  • the base station determines that the ratio is greater than a preset value.
  • the ratio is the ratio calculated by S302.
  • the base station measures multiple RSSIs of the working carrier in the preset duration, and calculates an average of the multiple RSSIs to obtain an average RSSI.
  • the base station determines that the average RSSI is greater than a preset RSSI threshold.
  • the average RSSI is calculated in S304.
  • the base station sends a carrier measurement indication to the user equipment.
  • the user equipment is a plurality of user equipments in a connected state in the cell.
  • the user equipment measures multiple RSSIs within a preset duration, and takes an average of multiple RSSIs.
  • the duration of the preset duration, the number of measured RSSIs, and the measured time interval are not limited in the present invention, and may be set as needed.
  • the user equipment returns an average RSSI to the base station.
  • the base station determines that the average RSSI of the user equipment feedback is greater than a preset RSSI threshold.
  • the base station sends a carrier switching indication to the user equipment, to indicate that the user equipment switches the current working carrier to the target carrier.
  • the base station evaluates the interference situation of the measured working carrier and the interference of the working carrier measured by the user equipment in the cell. To determine whether to perform carrier switching. In this way, the base station is prevented from periodically performing carrier measurement, and the active detection becomes a triggered passive detection, which reduces the processing overhead of the base station and improves the accuracy of the carrier handover evaluation.
  • FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the base station is configured to perform the method shown in FIG. 1.
  • the base station includes: a detection triggering module 401, and a measurement indication. Module 402 and switch identification module 403.
  • the detection triggering module 401 is configured to detect an interference situation of the working carrier corresponding to the cell if the proportion of the user equipment whose CQI in the cell is less than the preset CQI threshold exceeds a preset value.
  • the measurement indication module 402 is configured to: if the working carrier is strongly interfered, send a carrier measurement indication to multiple user equipments in the cell, where the carrier measurement indication is used to instruct the multiple user equipments to measure respective work The RSSI of the carrier and return the measured RSSI to the base station.
  • the switch identification module 403 is configured to determine each user according to the RSSI fed back by the multiple user equipments. Whether the device needs to perform carrier switching.
  • the detection trigger module is configured to:
  • the measurement indication module is used to:
  • the carrier measurement indication is sent to a plurality of user equipments in the cell based on scheduling information of the unlicensed carrier or the authorized carrier or RRC signaling.
  • the switch identification module is configured to:
  • the user equipment indicating that the feedback RSSI is smaller than the preset RSSI threshold performs carrier switching.
  • the detection trigger module is configured to:
  • the ratio is greater than the preset value, detecting an interference situation of the working carrier corresponding to the cell.
  • FIG. 5 is another schematic structural diagram of a base station according to an embodiment of the present invention.
  • a base station is used to implement the carrier measurement method based on an unlicensed frequency band, and the base station includes a processor.
  • the processor 501, the memory 502 and the communication interface 503, the number of the processors 501 in the base station may be one or more, and FIG. 5 takes a processor as an example.
  • the processor 501, the memory 502, and the communication interface 503 may be connected by a bus or other means, and the bus connection is taken as an example in FIG.
  • the memory 502 stores a set of program codes, and the processor 501 is configured to call the memory 502.
  • the ratio of the user equipment whose CQI is smaller than the preset CQI threshold exceeds a preset value, the interference of the working carrier corresponding to the cell is detected;
  • the performing, by the processor 501, the interference situation of detecting the working carrier corresponding to the cell includes:
  • the base station measures the RSSI of the working carrier corresponding to the cell multiple times within a preset duration
  • the base station averages the measured RSSIs to obtain an average RSSI
  • the performing, by the processor, the sending of the carrier measurement indication to the multiple user equipments in the cell includes:
  • the carrier measurement indication is sent to a plurality of user equipments in the cell based on scheduling information of the unlicensed carrier or the authorized carrier or RRC signaling.
  • the determining, by the processor, whether the user equipment needs to perform carrier switching according to the RSSI fed back by the multiple user equipments includes:
  • the user equipment indicating that the feedback RSSI is smaller than the preset RSSI threshold performs carrier switching.
  • the processor performs the step that the ratio of the user equipment in the cell that is less than the preset CQI threshold exceeds a preset value, and the interference situation that the base station detects the working carrier corresponding to the cell includes:
  • the ratio is greater than the preset value, detecting an interference situation of the working carrier corresponding to the cell.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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

Abstract

L'invention concerne un procédé de mesurage de porteuse basé sur une bande de fréquences sans licence. Le procédé comprend les étapes suivantes : si la proportion d'éléments d'équipement d'utilisateur dont un CQI est inférieur à un seuil prédéfini dans une cellule dépasse une valeur de CQI prédéfinie, une station de base détecte la situation de brouillage d'une porteuse opérationnelle correspondant à la cellule ; si la porteuse opérationnelle est affectée par un brouillage intense, la station de base transmet une indication de mesurage de porteuse à une pluralité d'éléments d'équipement d'utilisateur dans la cellule, l'indication de mesurage de porteuse étant utilisée pour ordonner à la pluralité d'éléments d'équipement d'utilisateur de mesurer un RSSI d'une porteuse opérationnelle correspondante respectivement et de retourner les RSSI mesurés à la station de base ; et la station de base détermine si chaque élément d'équipement d'utilisateur doit exécuter une commutation de porteuse d'après les RSSI retournés par la pluralité d'éléments d'équipement d'utilisateur. L'invention concerne également une station de base. La présente invention permet d'améliorer l'efficacité de détection d'une station de base et de réduire ainsi les surdébits de traitement.
PCT/CN2015/093540 2015-09-30 2015-10-31 Procédé de mesurage de porteuse basé sur une bande de fréquences sans licence, et station de base WO2017054288A1 (fr)

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CN201510638558.7A CN105337715B (zh) 2015-09-30 2015-09-30 一种基于非授权频段的载波测量方法和基站

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