WO2020050807A1 - Positioning of the most suitable users at the numerology centers in 5g and beyond cellular communications systems - Google Patents

Positioning of the most suitable users at the numerology centers in 5g and beyond cellular communications systems Download PDF

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Publication number
WO2020050807A1
WO2020050807A1 PCT/TR2019/050679 TR2019050679W WO2020050807A1 WO 2020050807 A1 WO2020050807 A1 WO 2020050807A1 TR 2019050679 W TR2019050679 W TR 2019050679W WO 2020050807 A1 WO2020050807 A1 WO 2020050807A1
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WO
WIPO (PCT)
Prior art keywords
users
numerology
cell
frequency space
numerologies
Prior art date
Application number
PCT/TR2019/050679
Other languages
French (fr)
Inventor
Hüseyin ARSLAN
Ahmet YAZAR
Original Assignee
T.C. Istanbul Medipol Universitesi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of WO2020050807A1 publication Critical patent/WO2020050807A1/en

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Classifications

    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
    • 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
    • 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
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • 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
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • 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
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference

Definitions

  • the invention relates to a method that includes positioning of the most suitable users at the numerology centers in frequency space based on the high reliability necessity of users in the coverage area of the base stations and the users at the edges of same coverage area under the fifth generation (5G) and beyond cellular communication systems using multiple numerology structures.
  • 5G systems are examined under three types of service classes instead of a single type of service preferred in previous systems and the systems are designed to take these classes into consideration.
  • These three types of services are enhanced mobile broadband (eMBB), massive machine-type communications (mMTC) and ultra-reliable low-latency communications (uRLLC).
  • eMBB enhanced mobile broadband
  • mMTC massive machine-type communications
  • uRLLC ultra-reliable low-latency communications
  • 5G systems use multiple numerology structures instead of a single kind of numerology structure.
  • a base station can serve with multiple sets of parameters at the same time.
  • All users of the same service type within the coverage of a base station can be served with the same numerology or with more than one numerology.
  • inter-numerology interference occurs in the frequency space between different numerologies, and the amount of this interference is much greater on the edge subcarriers of the frequency bands allocated for the different numerologies than the central subcarriers.
  • Different methods have been developed in the literature related to this problem, especially filtering, windowing and guard band usage. However, these methods have disadvantages in terms of complexity or decreased spectral efficiency.
  • the subject matter of the present invention is the use of multiple numerology structures in 5G and beyond cellular communication systems, by placing the most suitable users in numerology centers in frequency space based on the high reliability necessity of users in the coverage area of the base stations, the primary priority needs of the users and inter-cell interference on the users. It is aimed to allocate the inter-numerology interference fairly among the users. In this way, a fairness between the users in 5G and beyond cellular communication systems is established in terms of signal-to- interference ratio.
  • the present invention comprises a method for positioning the most suitable users in numerology centers in frequency space based on the high reliability necessity of users in the coverage area of the base stations and the users at the edges of same coverage area under 5G and post cellular communication systems that use multiple numerology structures.
  • Figure 1 Graph showing the subdivision of three different numerologies in frequency space and different parts of numerologies in frequency space.
  • Figure 2 A graph that divides the area covered by a base station into cell center and cell edges and shows the sample distribution of different types of services in these parts.
  • the method of positioning the most suitable users in numerology centers in 5G and beyond cellular communication systems subject of the invention is explained in detail below with no limiting effect.
  • the method according to the invention consists of two parts.
  • the subcarriers at the numerology center (5) are allocated in the frequency space (B) instead of the edge subcarriers (4) of different numerologies (1 ,2,3).
  • the spectral efficiency is increased by reducing the guard bands (6) to be left between numerologies.
  • the edge subcarriers (4) of the numerologies are allocated to the users (U) in need of high reliability, the inter-numerology guard bands (6) are more needed and the spectral efficiency is reduced.
  • the subcarriers at the numerology center (5) and numerology edges (4) of the numerologies (1 ,2,3) listed in the frequency space (B) are determined on the based on the subcarrier spacing of the two sequential numerologies,
  • the central subcarriers of the numerologies listed in the frequency space (B) are allocated, and in this allocation process the users of the uRLLC service group (U) take priority over the users of other service groups,
  • the coverage area of a base station (7) consists of two parts, the cell center (8) and the cell edges (9). Since the users at the cell edges (9) are more exposed to the inter-cel interference, the central subcarriers of the numerologies (5) in the frequency space (B) are allocated to these users. Thus, the users at the cell edges (9) are not affected at the same time by inter-cell interference and inter-numerology interference. If the subcarriers at the numerology edges (4) in frequency space (B) were assigned to the users at the cell edges (9), these users would be more affected by the inter-numerology interference in addition to the inter-cell interference. In this case, the in-user disparity would increase and the signal-to-interference ratio of the users at the cell edges (9) would worsen further.
  • the invention provides greater protection of users at the cell edges (9) from inter-numerology interference.
  • the coverage area of a base station (7) is divided into two sections: cell center (8) and cell edges (9) based on the signal-to-interference ratio of the users and their distance to the base station (7),
  • the subcarriers of the center (5) of the numerologies listed in the frequency space (B) are allocated, and in this allocation process, the users at the cell edges (9) take priority over the users in the cell center (8),
  • the uRLLC user (U) has priority to position at the cell center (8) for allocating the subcarriers of the numerologies listed in the frequency space (B),

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

Abstract

The invention relates to the most appropriate method of positioning users into numerology centers in frequency space (B) based on users in need of high reliability in the coverage area of base stations (7) and users at the edges (9) of coverage area for multiple numerology structures in fifth generation (5G) and beyond cellular communication systems.

Description

DESCRIPTION
POSITIONING OF THE MOST SUITABLE USERS AT THE NUMEROLOGY CENTERS IN 5G AND BEYOND CELLULAR COMMUNICATIONS SYSTEMS
Technical Field
The invention relates to a method that includes positioning of the most suitable users at the numerology centers in frequency space based on the high reliability necessity of users in the coverage area of the base stations and the users at the edges of same coverage area under the fifth generation (5G) and beyond cellular communication systems using multiple numerology structures.
The State of the Art / Known Status of Your Technique
Applications where 5G systems will be used are examined under three types of service classes instead of a single type of service preferred in previous systems and the systems are designed to take these classes into consideration. These three types of services are enhanced mobile broadband (eMBB), massive machine-type communications (mMTC) and ultra-reliable low-latency communications (uRLLC). Different needs of different service groups come to the fore. Sub-components of 5G communication systems are being developed considering these differences in needs.
Another important difference compared to previous cellular communication systems is that 5G systems use multiple numerology structures instead of a single kind of numerology structure. Using multiple numerology structures, a base station can serve with multiple sets of parameters at the same time. Thus, it has become possible to serve users with different needs with more appropriate parameter sets. All users of the same service type within the coverage of a base station can be served with the same numerology or with more than one numerology.
In the state of the art, inter-numerology interference occurs in the frequency space between different numerologies, and the amount of this interference is much greater on the edge subcarriers of the frequency bands allocated for the different numerologies than the central subcarriers. Different methods have been developed in the literature related to this problem, especially filtering, windowing and guard band usage. However, these methods have disadvantages in terms of complexity or decreased spectral efficiency.
The subject matter of the present invention is the use of multiple numerology structures in 5G and beyond cellular communication systems, by placing the most suitable users in numerology centers in frequency space based on the high reliability necessity of users in the coverage area of the base stations, the primary priority needs of the users and inter-cell interference on the users. It is aimed to allocate the inter-numerology interference fairly among the users. In this way, a fairness between the users in 5G and beyond cellular communication systems is established in terms of signal-to- interference ratio.
Technical Problems for Solution of the Problem
The present invention comprises a method for positioning the most suitable users in numerology centers in frequency space based on the high reliability necessity of users in the coverage area of the base stations and the users at the edges of same coverage area under 5G and post cellular communication systems that use multiple numerology structures.
Considering the approved numerology structures for 5G systems, it is seen that low latencies can be provided for uRLLC users but there is a shortage of users with high reliability requirements due to the lack of a numerical structure with a long cyclic prefix (CP) parameter. In order to avoid spectral efficiency differences between different numerology structures, this choice was made during 5G standards. With this in mind, in the first part of the method according to the invention, users with a high reliability need are more protected from inter-numerology interference. Thus, the protection bands to be left between the numerologies in the frequency space required for better protection of these users from interference are also reduced and the spectral efficiency is increased. The structural and characteristic features and all the advantages of the invention will be understood more clearly by the following figures and the detailed description, therefore the evaluation should be made in view of these figures and the detailed description.
Description of Pictures
Figure 1 : Graph showing the subdivision of three different numerologies in frequency space and different parts of numerologies in frequency space.
Figure 2: A graph that divides the area covered by a base station into cell center and cell edges and shows the sample distribution of different types of services in these parts.
Explanation of Parts Displayed by Reference Numbers in Pictures
1. Numerology-1
2. Numerology-2
3. Numerology-3
4. Numerology edges
5. Numerology centers
6. Guard bands between numerologies
7. Base station
8. Cell center
9. Cell edges
A. Power level
B. Frequency space
E. eMBB users
M. mMTC users
U. uRLLC users Description / Disclosure of the Invention
The method of positioning the most suitable users in numerology centers in 5G and beyond cellular communication systems subject of the invention is explained in detail below with no limiting effect. The method according to the invention consists of two parts. In the first part of the method, for the users (U) in need of high reliability, the subcarriers at the numerology center (5) are allocated in the frequency space (B) instead of the edge subcarriers (4) of different numerologies (1 ,2,3). Thus, users (U) in need of high reliability are more protected from inter-numerology interference. As a result, the spectral efficiency is increased by reducing the guard bands (6) to be left between numerologies. When the edge subcarriers (4) of the numerologies are allocated to the users (U) in need of high reliability, the inter-numerology guard bands (6) are more needed and the spectral efficiency is reduced.
The process steps of the first part of the method are as follows:
• The subcarriers at the numerology center (5) and numerology edges (4) of the numerologies (1 ,2,3) listed in the frequency space (B) are determined on the based on the subcarrier spacing of the two sequential numerologies,
• For the uRLLC service group users (U) within the coverage area of the base station (7), the central subcarriers of the numerologies listed in the frequency space (B) are allocated, and in this allocation process the users of the uRLLC service group (U) take priority over the users of other service groups,
• If all users are from the uRLLC service group, all subcarriers are allocated for these users mandatorily.
In the second part of the method according to the invention, the coverage area of a base station (7) consists of two parts, the cell center (8) and the cell edges (9). Since the users at the cell edges (9) are more exposed to the inter-cel interference, the central subcarriers of the numerologies (5) in the frequency space (B) are allocated to these users. Thus, the users at the cell edges (9) are not affected at the same time by inter-cell interference and inter-numerology interference. If the subcarriers at the numerology edges (4) in frequency space (B) were assigned to the users at the cell edges (9), these users would be more affected by the inter-numerology interference in addition to the inter-cell interference. In this case, the in-user disparity would increase and the signal-to-interference ratio of the users at the cell edges (9) would worsen further. The invention provides greater protection of users at the cell edges (9) from inter-numerology interference.
The process steps of the second part of the method are as follows:
• The coverage area of a base station (7) is divided into two sections: cell center (8) and cell edges (9) based on the signal-to-interference ratio of the users and their distance to the base station (7),
• For users at the cell edges (9), the subcarriers of the center (5) of the numerologies listed in the frequency space (B) are allocated, and in this allocation process, the users at the cell edges (9) take priority over the users in the cell center (8),
• When comparing a uRLLC user (U) located at the cell center (8) and a non- uRLLC user at the cell edge (9), the uRLLC user (U) has priority to position at the cell center (8) for allocating the subcarriers of the numerologies listed in the frequency space (B),
• The placement of all other users in the frequency space (B) is left flexible.
The technical and all other features referred to in each claim are followed by a reference number which is used only to facilitate understanding of the claims, and therefore should not be construed as limiting the scope of any of the elements indicated by these reference numbers for illustration purposes.
Around these basic concepts, it is possible to develop a wide variety of applications relating to the subject matter of the invention, the invention being not limited to the examples described herein, but essentially as set forth in the claims.
It is evident that one competent person can also introduce the novelty set forth in the invention using similar embodiments, and / or apply this embodiment to other similar purposes as used in the art. Thus, it is evident that such embodiments will be devoid of the criterion of innovation and in particular of exceeding the known state of the art.
Industrial Applicability / Application of Invention to Industrialization
By using the method of the invention by base stations and sim card inserted devices in the new generation of cellular communication systems, further protection of users in need of high reliability will be ensured, spectral efficiency will be increased and signal- to-interference ratio will be improved for users at cell edges.

Claims

1. The invention relates to a method of placing the most suitable users in numerology centers in 5G and beyond cellular communication systems; characterized in that it comprises the following process steps of the first part of the method:
• The subcarriers at the numerology center (5) and numerology edges (4) of the numerologies (1 ,2,3) listed in the frequency space (B) are determined on the based on the subcarrier spacing of the two sequential numerologies,
• For the uRLLC service group users (U) within the coverage area of the base station (7), the central subcarriers of the numerologies listed in the frequency space (B) are allocated, and in this allocation process the users of the uRLLC service group (U) take priority over the users of other service groups,
• If all users are from the uRLLC service group, all subcarriers are allocated for these users mandatorily.
2. The method of placing the most suitable users in numerology centers in 5G and beyond cellular communication systems according to Claim 1 ; characterized in that it comprises the following processing steps of the second part of the method:
• The coverage area of a base station (7) is divided into two sections: cell center (8) and cell edges (9) based on the signal-to-interference ratio of the users and their distance to the base station (7),
• For users at the cell edges (9), the subcarriers of the center (5) of the numerologies listed in the frequency space (B) are allocated, and in this allocation process, the users at the cell edges (9) take priority over the users in the cell center (8),
• When comparing a uRLLC user (U) located at the cell center (8) and a non- uRLLC user at the cell edge (9), the uRLLC user (U) has priority to position at the cell center (8) for allocating the subcarriers of the numerologies listed in the frequency space (B),
• The placement of all other users in the frequency space (B) is left flexible.
PCT/TR2019/050679 2018-09-04 2019-08-09 Positioning of the most suitable users at the numerology centers in 5g and beyond cellular communications systems WO2020050807A1 (en)

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TR201812617 2018-09-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101753503A (en) * 2008-11-27 2010-06-23 李宁 Method for realizing frequency reuse in communication system
WO2018021676A1 (en) * 2016-07-27 2018-02-01 Lg Electronics Inc. Method and apparatus for handling dc subcarrier in nr carrier in wireless communication system
US20180049064A1 (en) * 2016-08-12 2018-02-15 Qualcomm Incorporated Adaptive numerology for urllc

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101753503A (en) * 2008-11-27 2010-06-23 李宁 Method for realizing frequency reuse in communication system
WO2018021676A1 (en) * 2016-07-27 2018-02-01 Lg Electronics Inc. Method and apparatus for handling dc subcarrier in nr carrier in wireless communication system
US20180049064A1 (en) * 2016-08-12 2018-02-15 Qualcomm Incorporated Adaptive numerology for urllc

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