WO2013122306A1 - Procédé et dispositif de planification dans un système de communication sans fil pour la planification coordonnée des ressources - Google Patents

Procédé et dispositif de planification dans un système de communication sans fil pour la planification coordonnée des ressources Download PDF

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Publication number
WO2013122306A1
WO2013122306A1 PCT/KR2012/009196 KR2012009196W WO2013122306A1 WO 2013122306 A1 WO2013122306 A1 WO 2013122306A1 KR 2012009196 W KR2012009196 W KR 2012009196W WO 2013122306 A1 WO2013122306 A1 WO 2013122306A1
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WIPO (PCT)
Prior art keywords
resources
terminal
exclusive allocation
area
region
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PCT/KR2012/009196
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English (en)
Korean (ko)
Inventor
이기호
이용규
지영하
Original Assignee
주식회사 케이티
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.)
Filing date
Publication date
Priority claimed from KR20120048809A external-priority patent/KR101460329B1/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to US14/378,630 priority Critical patent/US9705657B2/en
Publication of WO2013122306A1 publication Critical patent/WO2013122306A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to a scheduling method and apparatus therefor in a wireless communication system considering exclusive allocation of resources.
  • the wireless communication system has a variable channel situation due to fading due to the position of the terminal or an obstacle, and thus increases the performance of the system by efficiently allocating resources in consideration of the channel state information of the terminal when scheduling the corresponding terminal. Let's do it.
  • CQI channel quality indication
  • Select a level For example, for a terminal having a poor channel state, a low MCS level may be selected to ensure reliable transmission instead of lowering a data transmission rate, thereby enabling efficient transmission.
  • resources in a wireless communication system can be largely divided into frequency resources and time resources, the optimal allocation of these resources is very important for improving the performance of the wireless communication system.
  • FIG. 1 is a diagram illustrating an example of resource allocation in an orthogonal frequency division multiplexing (OFDM) system.
  • FIG. 1 illustrates allocation of a frequency resource and a time resource in a grid form to a user.
  • OFDM orthogonal frequency division multiplexing
  • a reuse method of reusing the same resource is used in an area inside a cell, and an exclusive coordination method of resources using different resources between cells in a cell boundary area. This is used.
  • the exclusive allocation of resources is used or the exclusive allocation of resources used by the terminal due to the movement between the cell inner region and the cell boundary region is used.
  • the allocation of the MCS level due to the sudden change in the channel state of the terminal is not considered, and thus, the efficient data transmission is not achieved.
  • An object of the present invention is to provide a scheduling method and apparatus in a wireless communication system in consideration of exclusive allocation of resources for which data transmission efficiency is increased by allocating an MCS level according to whether exclusive allocation of resources is performed in a wireless communication system. .
  • Setting a gain value of? Determining, by the device, whether a terminal moves between an area in which a terminal does not perform exclusive allocation of resources and an area in which an exclusive allocation of resources is performed in an adjacent cell; When it is determined that the UE has moved between an area in which an exclusive allocation of resources is not performed and an area in which exclusive allocation of resources is performed within an adjacent cell, the device modulates and codes MCS considering the gain value. Controlling a radio signal processing apparatus in the adjacent cell to set a Scheme level to perform scheduling.
  • the terminal sets the signal size of the reverse pilot channel transmitted to the cell to which it belongs as a gain value for the adjacent cell.
  • the terminal is characterized by determining whether the terminal performs exclusive allocation of resources by determining whether the terminal is located in a cell boundary region through a signal received from the terminal.
  • the resource in the step of controlling the radio signal processing apparatus is obtained by adding the gain value to an MCS level allocated in an area in which the exclusive allocation of the data is not performed.
  • the resource in the step of controlling the radio signal processing apparatus The value obtained by subtracting the gain value from the allocated MCS level in the region in which the exclusive allocation of is performed is set to the MCS level.
  • a scheduling apparatus for commonly managing a radio signal processing apparatus, each of which is included in a plurality of cells and provides radio communication for a terminal in a cell, comprising: a receiving unit configured to receive an uplink signal strength value from a terminal through a plurality of radio signal processing apparatuses ; A gain value setting unit configured to set a gain value in the case of performing exclusive allocation of resources for each cell based on the signal strength value for each terminal received by the receiver; A determination unit determining a movement between a region where the terminal performs exclusive allocation of resources and a region where the exclusive allocation of resources is not performed, based on the signal strength value of each terminal received by the receiver; And when the determination of the movement of the terminal between the region in which the exclusive allocation of resources and the region in which the exclusive allocation of resources is not performed is performed by the determining unit, sets an MCS level using the gain value set in the gain setting unit. It includes a control unit.
  • the gain value setting unit may set a signal strength value received from an adjacent cell as a gain value.
  • the signal strength value is characterized in that the size of the signal of the reverse pilot channel that the terminal transmits to the cell to which it belongs.
  • the terminal is characterized by determining whether the terminal performs exclusive allocation of resources by determining whether the terminal is located in a cell boundary region through the signal strength value for each terminal.
  • the controller may further include controlling the radio signal processing apparatus to perform exclusive allocation of resources to the terminal when the terminal moves from an area in which the terminal does not perform exclusive allocation of resources to an area in which exclusive allocation of resources is performed. It is characterized by.
  • the controller may control the apparatus for processing a radio signal such that the terminal does not perform exclusive allocation of resources when the terminal moves from the region in which the exclusive allocation of resources is performed to the region in which the exclusive allocation of resources is not performed. Characterized in that.
  • the controller determines the gain value at an MCS level allocated in an area in which the exclusive allocation of resources is not performed. It is characterized by setting the added value to the MCS level.
  • the controller may be further configured to adjust the gain value to the MCS level allocated in the region where the exclusive allocation of resources is performed when the terminal moves from the region where the exclusive allocation of resources is performed to the region where the exclusive allocation of resources is not performed.
  • the subtracted value is set to the MCS level.
  • the target of the terminal is allocated by allocating an MCS level in consideration of a gain value due to the exclusive allocation of resources. Data transmission efficiency can be improved while maintaining a constant block error rate.
  • FIG 1 illustrates an example of resource allocation in an orthogonal frequency division multiplexing (OFDM) system.
  • OFDM orthogonal frequency division multiplexing
  • FIG. 2 is a diagram illustrating a concept of allocating resources through a cooperative scheme in general.
  • FIG. 3 illustrates a comparison of resource allocation when using a general scheduling scheme and an exclusive allocation scheme of resources in a wireless communication system.
  • FIG. 4 is a diagram illustrating an example of allocating frequency resources in an exclusive allocation scheme to terminals located at a cell boundary in a wireless communication system.
  • FIG. 5 is a diagram illustrating a concept of resource allocation for terminals located in an inner region of a cell in a wireless communication system.
  • FIG. 6 is a diagram illustrating an example in which a terminal moves from an area in which an exclusive allocation of resources is not made to an area in which an exclusive allocation of resources is made in an embodiment of the present invention.
  • FIG. 7 is a diagram for one example of moving a terminal from an area where an exclusive allocation of resources is made to an area where no exclusive allocation of resources is made in an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a network according to an embodiment of the present invention.
  • FIG. 9 is a flowchart illustrating a method of setting an MCS level when a terminal moves from an area where an exclusive allocation of resources is not made to an area where an exclusive allocation of resources is made according to an embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a method of setting an MCS level when a terminal moves from an area where an exclusive allocation of resources is made to an area where no exclusive allocation of resources is made according to an embodiment of the present invention.
  • 11 is a conceptual diagram illustrating a gain value resulting from performing exclusive allocation of resources in an embodiment of the present invention.
  • FIG. 12 is a graph of a gain value according to a reception strength of a reverse pilot channel of an adjacent cell in an embodiment of the present invention.
  • FIG. 13 is a block diagram of a digital signal processing apparatus according to an embodiment of the present invention.
  • a terminal is a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment (User Equipment). It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.
  • a base station includes an access point (AP), a radio access station (RAS), a node B (Node B), an advanced node B (evolved NodeB, eNodeB), transmission and reception It may also refer to a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, and the like. It may also include.
  • AP access point
  • RAS radio access station
  • Node B node B
  • evolved NodeB evolved NodeB, eNodeB
  • BTS base transceiver station
  • MMR mobile multihop relay
  • FIG. 3 illustrates a comparison of resource allocation when using a general scheduling scheme and an exclusive allocation scheme of resources in a wireless communication system.
  • FIG. 4 An example of allocating frequency resources in an exclusive allocation scheme to terminals located at a cell boundary is shown in FIG. 4.
  • the terminal A 410 is exclusively allocated such that the frequency resources used by the terminal A 410 and the terminal B 420 in the cell boundary region 13 between the two cells 10 and 20 are different from each other. ) And the terminal B 420 does not occur, the channel state of the terminals is improved, the transmission rate is improved.
  • the UE reports the level that the UE can receive at a value of 0 to 15 while maintaining a target block error rate (BLER) at a predetermined value, for example, 10%, as shown in Table 1 below. . If the CQI is low, the channel state is not good, and thus a low MCS level is allocated. However, if the CQI is high, the channel state is good, and a high MCS level is allocated.
  • BLER target block error rate
  • MCS levels allocated according to the CQI are 29 levels from 0 to 28, as shown in Table 2 below according to the standard specification, and appropriate MCS is allocated according to the CQI.
  • 2 means Quadrature Phase Shift Keying (QPSK)
  • 4 means 16QAM (Quadrature Amplitude Modulation)
  • 6 means 64QAM.
  • the terminal 450 moves from the location A where the exclusive allocation of resources is not made (CS Off) to the location B where the exclusive allocation of resources is made (CS On).
  • the CQI reported by the terminal 450 in location B is very high, and the MCS level determined by the terminal 450 is also very high.
  • the MCS level allocated to maintain the target block error rate at 10% is very high. Since this cannot be dramatically increased, the MCS level allocation cannot be made due to the rapid improvement of the channel state due to the exclusive allocation of resources.
  • the terminal 460 moves from the location B where the exclusive allocation of resources is made (CS On) to the location A where the exclusive allocation of resources is not made (CS Off).
  • the CQI reported by the terminal 460 in location A is suddenly lowered, and the MCS level determined by this is also suddenly lowered, but the target block error rate is 10%.
  • the MCS level is not properly allocated due to the sudden deterioration of the channel state due to not performing exclusive allocation of the performed resources.
  • FIG. 8 is a schematic structural diagram of a network according to an embodiment of the present invention.
  • a network includes a radio signal processing unit (RU) 100, a digital signal processing unit (DU) 200, and a core system 300. do.
  • the wireless signal processing apparatus 100 and the digital signal processing apparatus 200 constitute a signal processing system of wireless communication.
  • the wireless signal processing apparatus 100 converts and amplifies a digital signal received from the digital signal processing apparatus 200 into a radio frequency (RF) signal according to a frequency band as a part of processing a wireless signal.
  • the wireless signal processing apparatus 100 is connected to a plurality of digital signal processing apparatus 200 (110, 120, 130), each of the wireless signal processing apparatus 100 is installed in the service target area, that is, the cell.
  • the wireless signal processing apparatus 100 and the digital signal processing apparatus 200 may be connected by an optical cable.
  • the digital signal processing apparatus 200 performs a process of encrypting and decrypting a wireless digital signal, and is connected to the core system 300. Unlike the wireless signal processing apparatus 100, the digital signal processing apparatus 200 is a server that is not installed in a service target area but mainly installed in a centralized communication station, and is a virtualized base station. The digital signal processing apparatus 200 transmits and receives signals with the plurality of wireless signal processing apparatuses 100.
  • the existing communication base station includes a processing unit corresponding to each of the wireless signal processing apparatus 100 and the digital signal processing apparatus 200 in one physical system, and one physical system is installed in a service target area.
  • the system according to the embodiment of the present invention physically separates the wireless signal processing apparatus 100 and the digital signal processing apparatus 200, and only the wireless signal processing apparatus 100 is installed in the service area.
  • the core system 300 processes a connection between the digital signal processing apparatus 200 and an external network, and includes a switch (not shown).
  • the digital signal processing apparatus 200 measures the signal strength of the uplink received by the two wireless signal processing apparatuses 110 and 120 located in each of the adjacent cells 10 and 20, respectively, from the terminal. It is passed a value. Thereafter, the digital signal processing apparatus 200 evaluates uplink quality of the terminals 450 and 460 based on the signal strength values received from the two wireless signal processing apparatuses 110 and 120, and according to the evaluation result. It is determined whether the cell boundary area 13 of the terminals 450 and 460 is located. According to this determination, the digital signal processing apparatus 200 may know that the terminal 450 moves from the position A to the position B, and may also know that the terminal 460 moves from the position B to the position A. FIG. Therefore, the digital signal processing apparatus 200 may perform exclusive allocation of resources to the terminals located in the cell boundary region 13 due to the movement of the terminals 450 and 460.
  • the digital signal processing apparatus 200 transmits the facts of movement of the terminals 450 and 460 and whether or not exclusive allocation of resources to each terminal 450 and 460 is performed to each of the wireless signal processing apparatuses 110 and 120.
  • the scheduling of each of the wireless signal processing apparatuses 110 and 120 is controlled.
  • the digital signal processing apparatus 200 evaluates the uplink quality of the terminals 450 and 460 based on the signal strength values received from the two wireless signal processing apparatuses 110 and 120, and the terminal according to the evaluation result.
  • Techniques for determining the location of the cell boundary region 13 at 450 and 460 are well known to those skilled in the art, and thus detailed description thereof will be omitted.
  • the MCS level ⁇ is allocated at a location A where the terminal 450 does not have exclusive allocation of resources (CS Off). State (S100), when moving to location B where exclusive allocation of resources is made (CS On), that is, when the terminal 450 enters the boundary area 13 that performs exclusive allocation of resources (S110).
  • the MCS level ⁇ is allocated as a result of adding the gain value CS_gain calculated by performing exclusive allocation of resources to the MCS level ⁇ allocated at position A, that is, the following Equation 1 (S120).
  • MCS level ⁇ + CS_gain
  • ⁇ is the MCS level determined before the exclusive allocation of resources is performed.
  • the digital signal processing apparatus 200 includes the MCS level ⁇ at the position B where the terminal 460 is exclusively allocated the resources (CS On) as shown in FIG. 7.
  • this allocated state S200
  • the mobile station moves to a location A where no exclusive allocation of resources is made (CS Off)
  • CS Off no exclusive allocation of resources is made
  • the cell is moved.
  • the MCS level of the result obtained by subtracting the gain value CS_gain calculated by performing the exclusive allocation of resources to the MCS level ⁇ allocated at position B, that is, the following equation
  • the MCS level is allocated as shown in 2 (S220).
  • MCS level ⁇ - CS_gain
  • ⁇ is the MCS level determined when the exclusive allocation of resources is performed.
  • the gain value CS_gain is set in association with the interference magnitude of the adjacent cells of the terminals 470 and 480.
  • the terminal 1 470 receives interference when the cell 2 20 does not perform exclusive allocation of resources. However, when the exclusive allocation of resources is performed, the interference disappears. Therefore, in the wireless signal processing apparatus 110, the interference magnitude at the terminal 1 470 is measured using the signal magnitude of the reverse pilot channel transmitted by the terminal 2 480 to the base station 120.
  • the interference magnitude in the terminal 2 480 is measured using the signal magnitude of the reverse pilot channel transmitted by the terminal 1 470 to the base station 110.
  • the signal size of the reverse pilot channel is felt large in the adjacent cell, it means that the influence of interference is large.
  • there is more CS_gain since there is no more interference in this case when the exclusive allocation of resources is performed, there is more CS_gain.
  • the higher CS_gain value is applied when determining the MCS level.
  • the exclusive allocation of resources is not performed in the state of receiving a high CS_gain, this means that the interference is as much as this. Therefore, the high CS_gain is omitted.
  • the value of CS_gain is set to be larger as the signal size of the reverse pilot channel received from the adjacent interfering cell when the exclusive allocation of resources is not performed.
  • FIG. 13 is a block diagram of a digital signal processing apparatus 200 according to an embodiment of the present invention.
  • the digital signal processing apparatus 200 includes a receiver 210, a gain value setter 220, a determiner 230, and a controller 240.
  • the receiver 210 receives an uplink signal strength value determined by signals received from each terminal from the radio signal processing apparatuses 110 and 120.
  • the gain value setting unit 220 receives uplink signal strength values received from the wireless signal processing apparatuses 110 and 120 included in the adjacent cells 10 and 20 and sets the gain values of the adjacent cells. For example, the cells 10 and 20 are adjacent to each other, the signal strength value of the uplink received from the radio signal processing apparatus 110 of the cell 10 is set as a gain value in the cell 20, and the cell ( The signal strength value of the uplink received from the radio signal processing apparatus 120 of FIG. 20 is set as a gain value in the cell 10.
  • the determination unit 230 determines whether the terminal is located inside the cell or the boundary area between the cells based on the signal strength value for each terminal received by the receiver 210. According to this determination, it is possible to determine whether the UE has moved from the inside of the cell to the boundary region between the cells or from the boundary region between the cells. That is, it may be determined whether the terminal has moved from location A, which does not perform exclusive allocation of resources, to location B, which performs exclusive allocation of resources, or vice versa.
  • the control unit 240 may include the gain value set in the gain value setting unit 220.
  • information on whether to perform exclusive allocation of resources due to the movement of the terminal is transmitted to the wireless signal processing apparatuses 110 and 120 so that the corresponding wireless signal processing apparatus 110 or 120 performs exclusive allocation of resources due to the movement of the terminal. It is possible to allocate the optimal MCS level due to the movement of the terminal while controlling to do or do not perform.
  • the wireless signal processing apparatus (110, 120) is moved by the controller 240 from the region where the terminal does not perform exclusive allocation of resources to the region where the exclusive allocation of resources to the MCS according to Equation 1 above.
  • the terminal allocates a level and moves from an area in which the exclusive allocation of resources is performed to an area in which the exclusive allocation of resources is not performed, allocates the MCS level according to Equation 2 above.
  • the target block error rate of the terminal is allocated by allocating an MCS level in consideration of a gain value resulting from performing exclusive allocation of resources. It is possible to increase the data transmission efficiency while maintaining a constant level.

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

Abstract

La présente invention se rapporte à un procédé de planification et dispositif dans un système de communication sans fil pour la planification coordonnée d'une ressource. Selon ce procédé, le dispositif de planification définit une valeur de gain lorsqu'un terminal effectue une planification coordonnée la planification d'une ressource dans une cellule voisine. En outre, le dispositif détermine si le terminal se déplace entre une région où la planification coordonnée de la ressource est effectuée et une région où la planification coordonnée de la ressource n'est pas effectuée, dans la cellule voisine. Ensuite, s'il est déterminé que le terminal se déplace entre une région dans la cellule voisine où la planification coordonnée de la ressource est effectuée et une région où la planification coordonnée de la ressource n'est pas effectuée, le dispositif commande un dispositif de traitement de signal sans fil dans la cellule voisine de manière à établir un niveau de modulation et de schéma de codage pour la valeur de gain et exécuter la planification.
PCT/KR2012/009196 2012-02-14 2012-11-02 Procédé et dispositif de planification dans un système de communication sans fil pour la planification coordonnée des ressources WO2013122306A1 (fr)

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US14/378,630 US9705657B2 (en) 2012-02-14 2012-11-02 Method and apparatus for scheduling in wireless communication system for coordinated scheduling

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KR10-2012-0015028 2012-02-14
KR20120015028 2012-02-14
KR20120048809A KR101460329B1 (ko) 2012-02-14 2012-05-08 자원의 배타적 할당을 고려한 무선 통신 시스템에서의 스케줄링 방법 및 그 장치
KR10-2012-0048809 2012-05-08

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Citations (5)

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KR20080073813A (ko) * 2007-02-07 2008-08-12 삼성전자주식회사 광대역 무선통신 시스템에서 거리 기반 주파수 대역 선택장치 및 방법
WO2010085190A1 (fr) * 2009-01-23 2010-07-29 Telefonaktiebolaget L M Ericsson (Publ) Attribution et affectation de signaux de référence de liaison montante pour des grappes de cellules
KR20100091326A (ko) * 2009-02-10 2010-08-19 삼성전자주식회사 무선통신시스템에서 상향링크 자원 할당 장치 및 방법
KR20100108437A (ko) * 2008-03-31 2010-10-06 닛본 덴끼 가부시끼가이샤 무선통신 시스템, 기지국, 이동국 및 송신파라미터 결정방법
KR20100118534A (ko) * 2009-04-28 2010-11-05 한국전자통신연구원 전용 레퍼런스 시그널 전송 방법 및 전용 레퍼런스 시그널 수신 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080073813A (ko) * 2007-02-07 2008-08-12 삼성전자주식회사 광대역 무선통신 시스템에서 거리 기반 주파수 대역 선택장치 및 방법
KR20100108437A (ko) * 2008-03-31 2010-10-06 닛본 덴끼 가부시끼가이샤 무선통신 시스템, 기지국, 이동국 및 송신파라미터 결정방법
WO2010085190A1 (fr) * 2009-01-23 2010-07-29 Telefonaktiebolaget L M Ericsson (Publ) Attribution et affectation de signaux de référence de liaison montante pour des grappes de cellules
KR20100091326A (ko) * 2009-02-10 2010-08-19 삼성전자주식회사 무선통신시스템에서 상향링크 자원 할당 장치 및 방법
KR20100118534A (ko) * 2009-04-28 2010-11-05 한국전자통신연구원 전용 레퍼런스 시그널 전송 방법 및 전용 레퍼런스 시그널 수신 방법

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