KR20160138645A - Coexistence technology using fractional bandwidth - Google Patents
Coexistence technology using fractional bandwidth Download PDFInfo
- Publication number
- KR20160138645A KR20160138645A KR1020150072733A KR20150072733A KR20160138645A KR 20160138645 A KR20160138645 A KR 20160138645A KR 1020150072733 A KR1020150072733 A KR 1020150072733A KR 20150072733 A KR20150072733 A KR 20150072733A KR 20160138645 A KR20160138645 A KR 20160138645A
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- bandwidth
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- coexistence
- lte
- different communication
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- 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
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/20—Negotiating bandwidth
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- 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
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A method of coexistence using fragmented bandwidth according to an embodiment of the present invention includes: setting a target resource occupancy of the different communication systems in advance in a coexistence method between different communication systems; The different communication system retrieving an empty fractional bandwidth of frequency resources; And allocating a resource corresponding to an empty fragment bandwidth to a communication system having a low occupancy rate according to the predetermined target resource occupancy when the empty fragment bandwidth is retrieved.
Description
The present invention relates to a coexistence method using a fragmented bandwidth, and more particularly, to a technique capable of minimizing wasted frequency resources by coexisting using fractional bandwidths between different communication systems.
Recently, the 3rd Generation Partnership Project (3GPP) has been developing a standard technology for utilizing LTE (Long Term Evolution system) system operating in the existing license band in the license-exempt band of 5 GHz. The license-unlicensed band Duplex has a TDD (Time Division Duplex) mode considering both downlink and uplink / downlink of FDD (Frequency-Division Duplex). .
In order to use the different communication systems (LTE system, WiFi system) coexisting with each other, conventionally, the frequency resource or the time resource is orthogonally divided and used.
However, such an orthogonal division scheme may have an unused fragment bandwidth, which may worsen the frequency use efficiency.
The embodiment of the present invention can allocate orthogonally fragmented bandwidths to different communication systems so that they can coexist at the same time and improve frequency use efficiency
We propose a coexistence method using fragment bandwidth.
The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.
A method of coexistence using fragmented bandwidth according to an embodiment of the present invention includes: setting a target resource occupancy of the different communication systems in advance in a coexistence method between different communication systems; The different communication system retrieving an empty fractional bandwidth of frequency resources; And allocating a resource corresponding to an empty fragment bandwidth to a communication system having a low occupancy rate according to the predetermined target resource occupancy when the empty fragment bandwidth is retrieved.
This technology enables the coexistence of LTE and Wi-Fi systems and enhances spectrum utilization efficiency by using scalable and fractional bandwidth.
In addition, since the Wi-Fi symbol and the LTE OFDM symbol can be freely transmitted in the time domain, the present technology is less susceptible to delay.
1 is an IEEE 802.11 physical layer structure to which a coexistence technique of the present invention is applied.
2 is a diagram illustrating an IEEE 802.11a / n / ac channel bandwidth for explaining the coexistence technique of the present invention.
3 is a table showing IEEE 802.11a / n / ac FFT sizes for explaining the coexistence technique of the present invention.
4 is a 3GPP LTE downlink frame structure diagram for explaining a coexistence technique of the present invention.
5 is a 3GPP LTE downlink resource allocation structure diagram for explaining a coexistence technique of the present invention.
FIG. 6 is a diagram illustrating intersymbol interference between an LTE system and a Wi-Fi system OFDM symbol for explaining the coexistence technique of the present invention.
FIG. 7 is a diagram for explaining a method of performing coexistence using a fixed fragment bandwidth between an LTE system and a Wi-Fi system according to an embodiment of the present invention.
8 is a diagram for explaining a method of performing coexistence using an adaptive fragment bandwidth between an LTE system and a Wi-Fi system according to an embodiment of the present invention.
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.
In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.
The present invention proposes a technique that utilizes fractional bandwidth to minimize wasted frequency resources while effectively communicating with different communication systems. Here, the different communication systems means a communication system that uses the entire band at a given time and a communication system that uses a certain band (sub-carrier group) at a given time. Hereinafter, the present invention will be described using an LTE (Long Term Evolution) system as an example of a communication system using a Wi-Fi system as an example of a communication system that uses the entire band at a given time and using a certain band at a given time . However, different communication systems are not limited to Wi-Fi systems and LTE systems.
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 8. FIG.
1 is an IEEE 802.11 physical layer structure to which a coexistence technique of the present invention is applied. Referring to FIG. 1, the LTE-U (LAA) system can be applied to the 5 GHz ISM band.
The Wi-Fi standard using the 5 GHz ISM band is IEEE 802.11a / 11n / 11ac, and the IEEE 802.11ax standard currently under development is likely to use 5 GHz, so the present invention can be applied.
FIG. 2 is a diagram showing an IEEE 802.11a / n / ac channel bandwidth for explaining the coexistence technique of the present invention, and FIG. 3 is a table showing IEEE 802.11a / n / ac FFT size for explaining a coexistence technique of the present invention. to be.
The IEEE 802.11a, 11n, and 11ac standards described above have various bandwidth options of 5, 10, 20, 40, 80 and 160 MHz as shown in FIGS. 2 and 3, Do.
FIG. 4 is a 3GPP LTE downlink frame structure diagram for explaining a coexistence technique of the present invention, and FIG. 5 is a 3GPP LTE downlink resource allocation structure diagram for explaining a coexistence technique of the present invention.
Referring to FIG. 4 and FIG. 5, the LTE system minimum resource allocation unit (Resoure Block = 1 slot) becomes 7 * OFDM symbol on the time axis. In this case, referring to FIG. 5, 20 slots form one frame and two slots form one sub-frame. On the other hand, LTE system minimum resource allocation unit (Resoure Block = 1 slot; 100) is composed of 12 subcarriers along the frequency axis.
6 is a diagram illustrating inter-symbol interference (ISI) between an LTE system and a Wi-Fi system OFDM symbol for explaining the coexistence technique of the present invention.
Referring to FIG. 6, the Wi-Fi OFDM symbol time is 4 us on a 20 MHz bandwidth basis on the time axis, while the LTE OFDM symbol time is 71.4 us (normal CP basis).
On the frequency axis, Wi-Fi OFDM symbols are allocated over the entire bandwidth, while LTE OFDM symbols are allocated in subcarrier spacing (actually 12 * subcarrier spacing units).
Fundamentally, due to differences between OFDM and OFDMA schemes, there are significant differences in OFDM symbol characteristics due to differences between Wi-Fi small cells and LTE macro cells.
In the present invention, efficient LTE and Wi-Fi coexistence can be achieved by using the characteristics and the fragment bandwidth between the Wi-Fi and LTE signals, and at the same time, the resource utilization efficiency can be increased.
The coexistence technique between different communication systems using the fragment bandwidth of the present invention will be described in detail with reference to FIG. 7 and FIG. 8 below.
FIG. 7 is a diagram for explaining a method of performing coexistence using a fixed fragment bandwidth between an LTE system and a Wi-Fi system according to an embodiment of the present invention. That is, FIG. 7 discloses a method in which signals of the LTE system and the WiFi system coexist using a fractional band width while pre-allocating a resource allocation area.
For example, half of the 80 MHz, 40 MHz, is used by the LTE system and the remaining 40 MHz is used by the Wi-Fi system as a non-bandwidth. In the case of coexistence using this fixed fragmented bandwidth, both LTE systems and Wi-Fi system operators (or institutions) can make appointments in a controllable region / building (eg ETRI infomobile, Samsung TN Institute Infomobile etc.) So that resources can be used in a way that is
In the case of using the fixed fragmented bandwidth, since the resource allocation regions are previously separated from each other, the operation is relatively simple, but the application region can be limited.
FIG. 8 is a diagram for explaining a method of performing coexistence using an adaptive fractional bandwidth between an LTE system and a Wi-Fi system according to an embodiment of the present invention.
FIG. 8 shows a method of searching for a vacant fractional bandwidth in an LTE system and a Wi-Fi system in real time.
This approach requires an interval (search interval) and a search operation to find empty fragment bandwidth before assigning a new fractional resource. In this case, the average target resource share of the LTE system and the Wi-Fi system is set for the fairness, and the resource of the system having the low share is preferentially allocated. The coexistence method using the adaptive fragment bandwidth is superior to the method using the fixed fragment bandwidth shown in FIG. 7.
As described above, the present invention makes it possible to coexist LTE system and Wi-Fi system and improve spectrum utilization efficiency by using scalable and fractional bandwidth. In addition, the existing Wi-Fi system and LTE system standard can be applied without major modification, which is efficient. In addition, the Wi-Fi system and the LTE OFDM symbols can be freely transmitted in the time domain, which is less susceptible to delay.
The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.
Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
Claims (1)
Setting a target resource occupancy of the different communication systems in advance;
The different communication system retrieving an empty fractional bandwidth of frequency resources; And
Allocating resources corresponding to an empty fragment bandwidth to a communication system having a low occupancy rate according to the predetermined target resource occupancy when the empty fragment bandwidth is retrieved;
The method comprising:
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| KR1020150072733A KR20160138645A (en) | 2015-05-26 | 2015-05-26 | Coexistence technology using fractional bandwidth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019112493A1 (en) * | 2017-12-04 | 2019-06-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency multiplexing of first and second ofdma transmissions |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140042775A (en) | 2011-01-06 | 2014-04-07 | 알테어 세미콘덕터 엘티디. | Lte/wi-fi coexistence |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140042775A (en) | 2011-01-06 | 2014-04-07 | 알테어 세미콘덕터 엘티디. | Lte/wi-fi coexistence |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019112493A1 (en) * | 2017-12-04 | 2019-06-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency multiplexing of first and second ofdma transmissions |
| EP3721651A4 (en) * | 2017-12-04 | 2021-07-21 | Telefonaktiebolaget LM Ericsson (publ) | Frequency multiplexing of first and second ofdma transmissions |
| US11700534B2 (en) | 2017-12-04 | 2023-07-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency multiplexing of first and second OFDMA transmissions |
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