KR20120049804A - Method and apparatus for allocating resource in wireless communication system - Google Patents

Method and apparatus for allocating resource in wireless communication system Download PDF

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Publication number
KR20120049804A
KR20120049804A KR1020110107783A KR20110107783A KR20120049804A KR 20120049804 A KR20120049804 A KR 20120049804A KR 1020110107783 A KR1020110107783 A KR 1020110107783A KR 20110107783 A KR20110107783 A KR 20110107783A KR 20120049804 A KR20120049804 A KR 20120049804A
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South Korea
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subframe
absf
downlink control
control information
terminal
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KR1020110107783A
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Korean (ko)
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샨청
조준영
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삼성전자주식회사
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Priority to US61/411,602 priority
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Priority claimed from US13/292,445 external-priority patent/US9161319B2/en
Publication of KR20120049804A publication Critical patent/KR20120049804A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/30TPC using constraints in the total amount of available transmission power
    • H04W52/32TPC of broadcast or control channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/0406Wireless resource allocation involving control information exchange between nodes
    • H04W72/042Wireless resource allocation involving control information exchange between nodes in downlink direction of a wireless link, i.e. towards terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks

Abstract

 In a wireless communication system, homogeneous or heterogeneous networks operating on the same frequency bandwidth may coexist. In such a situation, effective intercell interference cancellation (ICIC) techniques should be considered to reduce inter-network interference. Time domain multiplexing is one of the promising ICIC techniques in which one selected network / cell transmits at a given time / subframe while all other networks / cells stop transmitting or transmit at low power. The present invention proposes a method for defining resource allocation and transmission characteristics for these subframes whose transmission power is considerably lower than the general subframes.

Description

Resource allocation method and apparatus in wireless communication system {METHOD AND APPARATUS FOR ALLOCATING RESOURCE IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for allocating resources in a wireless communication system in which frequency-time resources are divided into subframes in the time domain.

In general, mobile communication systems have been developed to provide voice services while guaranteeing user activity. However, mobile communication systems are gradually expanding to not only voice but also data services, and now they have developed to the extent that they can provide high-speed data services. However, in the mobile communication system in which a service is currently provided, a shortage of resources and users demand faster services, and thus, a more advanced mobile communication system is required.

In response to these demands, one of the systems being developed as a next generation mobile communication system, a specification work for Long Term Evolution (LTE) and LTE-Advanced (LTE-A) is underway in the 3rd Generation Partnership Project (3GPP). LTE and LTE-A are technologies that implement high-speed packet-based communication with transmission rates of up to 100 Mbps. To this end, various methods are discussed. For example, the network structure can be simplified to reduce the number of nodes located on the communication path, or the wireless protocols can be as close to the wireless channel as possible.

Resource allocation in the wireless communication system is performed through a subframe. One subframe consists of a plurality of sub-carriers / resource elements (REs) over a plurality of OFDM symbols. These plurality of subcarriers may be continuous or discontinuous in the frequency domain, and these plurality of OFDM symbols may also be continuous or discontinuous in the time domain. In the following description, it is assumed for convenience that one subframe is composed of a plurality of subcarriers over a plurality of consecutive OFDM symbols. Resources in the subframe may be further divided into resource blocks (RBs), and in a multi-user Multi Input Multi Output (MIMO) transmission mode, one RB may be assigned to one of the connected terminals or a plurality of connected terminals. Can be assigned.

One control channel is designed to transmit a control signal including downlink control information (or downlink control information format, DCI format) for downlink resource allocation. The design of the control channel can vary from system to system. In 3GPP LTE Release 8, the physical downlink control channel (PDCCH) consists of the first several symbols of each subframe. The UE searches for its DCI format in the PDCCH region and if the DCI format is detected, it reads the information of the DCI format for the current transmission subframe. The DCI format for the downlink includes RB resource allocation, modulation and coding scheme (MCS), HARQ parameters, and the like.

Meanwhile, the subframe may be divided into a general subframe and a frame in which data of low power is transmitted (Almost-Blank Sub-Frame). Conventionally, when at least two networks are present at the same location or have overlapping regions, interference may occur, so scheduling and data transmission are not performed for the ABSF.

In this case, there is a problem in that limited resources cannot be efficiently used because ABSF is not utilized.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method and apparatus for scheduling low power data transmission in the ABSF.

Another object of the present invention is to provide a method and apparatus for reducing scheduling overhead when scheduling data transmission in ABSF.

Base station in a wireless communication system for transmitting a radio frame divided into a plurality of subframes including at least one or more first subframe and at least one or more second subframe of the present invention for solving the above problems The method of allocating a resource may include generating first downlink control information including resource allocation information for the first subframe and a second downlink including resource allocation information for the second subframe. Generating link control information, and transmitting the first downlink control information and the second downlink control information to the terminal through the first subframe, and transmit power for the second subframe. Is smaller than the transmit power for the first subframe.

In addition, a method for obtaining resource allocation information of a terminal in a wireless communication system for transmitting a radio frame divided into a plurality of subframes including at least one first subframe and at least one second subframe of the present invention. Receiving a first subframe including first downlink control information for the first subframe and second downlink control information for the second subframe, and receiving the received first downlink control information And receiving and decoding the first subframe and the second subframe according to second downlink control information, wherein the transmit power for the second subframe is greater than the transmit power for the first subframe. It is characterized by a small one.

In addition, a base station for allocating resources in a wireless communication system for transmitting a radio frame divided into a plurality of subframes including at least one or more first subframes and at least one or more second subframes of the present invention is a terminal. And a wireless communication unit for transmitting and receiving a control signal or data, and generating first downlink control information including resource allocation information for the first subframe, and resource allocation information for the second subframe. And generating a second downlink control information including a control unit and controlling the first downlink control information and the second downlink control information to be transmitted to a terminal through the first subframe. The transmit power for the subframe is smaller than the transmit power for the first subframe.

In addition, in a wireless communication system for transmitting a radio frame divided into a plurality of subframes including at least one or more first subframes and at least one or more second subframes of the present invention, a terminal is allocated a resource from a base station. Receiving a first subframe including a wireless communication unit for transmitting and receiving a control signal or data with the base station, and the first downlink control information for the first subframe and the second downlink control information for the second subframe And a control unit configured to receive and decode the first subframe and the second subframe according to the received first downlink control information and the second downlink control information. The transmit power is smaller than the transmit power for the first subframe.

According to the present invention, since the low-power data transmission is scheduled in the ABSF and data is transmitted through the ABSF, limited resources can be used more efficiently than in the prior art, which does not transmit data in the ABSF. In addition, according to an embodiment of the present invention, since the DCI size for scheduling in the ABSF can be reduced, the ABSF scheduling overhead can be reduced.

1 is a diagram illustrating various embodiments of an effective range of scheduling information indicated by an ABSF DCI format according to an embodiment of the present invention.
2 illustrates an example of resource allocation in an ABSF according to an embodiment of the present invention.
3 is a flowchart illustrating an operation sequence of a base station according to an embodiment of the present invention.
4 is a flowchart illustrating an operation sequence of a terminal according to an embodiment of the present invention.
5 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present invention.
6 is a block diagram showing the internal structure of a terminal according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of well-known functions and constructions that may obscure the gist of the present invention will be omitted.

In addition, in describing the embodiments of the present invention in detail, an advanced E-UTRA (or LTE-A) system supporting carrier aggregation will be the main target, but the main points of the present invention are similar. Other communication systems having a technical background and a channel form may be applied with a slight modification without departing from the scope of the present invention, which may be determined by those skilled in the art. For example, the subject matter of the present invention can be applied to multicarrier HSPA supporting carrier combining.

And throughout the present invention, 3GPP LTE Releases 8-10 are considered conventional systems and Release 11 and above are considered systems in which embodiments of the present invention may be implemented. In addition, the present invention is applicable to other cellular systems such as IEEE 802.16 (WiMaX).

PDCCH Structure of LTE Rel8

In 3GPP LTE Release 8, one PDCCH is present in the first several OFDM symbols. The number of OFDM symbols used for the PDCCH is indicated in another physical control format indication channel (PCFICH) in the first OFDM symbol. Each PDCCH consists of L control channel elements (CCEs), where L = 1,2,4,8 to indicate different levels of CCE coupling, and each CCE is distributed over a transmission bandwidth. It consists of two subcarriers.

DCI format design

The DCI format in LTE is designed to deliver the control information needed by the user while minimizing the size of the payload and the complexity of implementation and evaluation. In general, the number of bits needed for resource allocation is determined based on the transmission mode along with the system bandwidth.

Intercell Interference Coordination (ICIC)

If at least two networks are deployed in the same location or overlap each other, for example, if a cellular network and a femtocell network have overlapped areas and operate on the same frequency band, an inter-cell interference control (ICIC) scheme This should apply. One of the ICIC schemes is time domain multiplexing, i.e., the selected network / cell transmits while all other coexisting networks / cells do not transmit or maintain very low transmit power.

On the other hand, in order to maintain a connection with the general operation for the existing terminals, the synchronization channel and / or the general reference and / or some control channels must be transmitted even if there is no transmission data in the current subframe. To this end, there are several ways to minimize the mutual interference of the aforementioned synchronization and control information by adjusting the relative subframe offset (off-set) between networks.

In the present invention, a conventional frame is called a general subframe (or a first subframe, which is the same below), and a frame in which there is no data transmission or a low power data transmission is made of an almost-blank sub-frame. ABSF) (or second subframe, which is the same below). Here, the transmission power of the ABSF (ie, the second subframe) is lower than that of the general subframe (ie, the first subframe). That is, the present invention focuses on the situation where low power data transmission occurs in the ABSF. The DCI indicating the scheduling information in the general subframe is called a general DCI format (or the first downlink control information, which is the same below), and the DCI indicating the scheduling information in the ABSF is referred to as an ABSF DCI format (or, 2 downlink control information, which is the same below).

 The transmit power in the ABSF should be adjusted as low as possible to minimize intercell interference. However, certain signals (DCIs) including a synchronization signal, a reference signal, and a control signal carrying HARQ information should be guaranteed for a predetermined level or more. Therefore, such DCI must be transmitted at the same power as the transmit power of the general subframe.

If the ABSF DCI format and the data scheduled by the ABSF DCI format are transmitted together in the same ABSF, the ABSF should be transmitted at the same transmission power as the general subframe, which means that interference with other neighboring cells is caused. do. With this in mind, the present invention allows the ABSF DCI format to be transmitted in a normal subframe prior to ABSF transmission.

Throughout the present invention described below, the system basically assumes broadcasting the ABSF DCI format to the UE scheduled in the ABSF prior to ABSF transmission. Such a broadcast may be delivered through a special downlink control indicator or higher layer signaling, and a detailed design is outside the scope of the present invention. In summary, it is assumed that the UE knows the ABSF scheduling pattern in advance. Here, the ABSF scheduling pattern means a rule in which a general subframe and an ABSF are arranged in one radio frame. For example, if one subframe is divided into 10 subframes, and the subframe includes a general subframe and an ABSF, the number and arrangement order of each of the general subframe and the ABSF may mean an ABSF scheduling pattern. Can be.

1. Effective Range of Scheduling Instruction for ABSF DCI

In scheduling, the ABSF may occupy one or several subframes within a radio frame. In this case, it is assumed that the terminal should know the ABSF pattern in advance.

The general DCI format for downlink scheduling for the general subframe is transmitted in the PDCCH region of the general subframe. DCI signaling is performed for each terminal, and each terminal attempts to detect its DCI format in the PDCCH region by blind decoding.

In the present invention, however, whether the ABSF DCI format is maintained as the conventional general DCI format or the ABSF DCI format is newly defined may be a problem.

The embodiment of the present invention proposes the following two implementation methods for the ABSF DCI format implementation method.

A. A method of newly defining a DCI format (ABSF DCI) for informing the terminal only scheduling information in the ABSF

According to this, the conventional DCI format for the current subframe and the new DCI format for reporting scheduling information in the ABSF are transmitted separately (in parallel).

B. A method of newly defining a DCI format indicating scheduling information in a general subframe simultaneously with an ABSF

According to this, the conventional DCI format information is a subset of the new DCI format information. In this case, new fields are added on top of the conventional DCI format to form a new DCI format for ABSF scheduling.

In the embodiments of the present invention described below, method A is assumed. That is, the ABSF DCI format is defined separately from the conventional DCI format. At the same time, both the conventional general DCI format for reporting scheduling information in the general subframe and the new ABSF DCI format for reporting scheduling information in the ABSF are transmitted to the UE in the general subframe, respectively. However, it should be noted that this principle is not limited to the method A and is applicable only, and that the same principle may also operate for the method B.

In this case, however, it is necessary to determine whether the ABSF DCI format transmitted in the general subframe indicates scheduling information for some ABSFs among the ABSFs included in the radio frame. A scheduling effective range indicated by the ABSF DCI will be described in detail with reference to FIG. 1.

1 is a diagram illustrating various embodiments of an effective range of scheduling information indicated by an ABSF DCI format according to an embodiment of the present invention.

In FIG. 1, one radio frame includes 10 subframes and illustrates an ABSF pattern including 6 ABSFs among the 10 subframes. Throughout the present invention, it is assumed that one radio frame consists of ten subframes having indices from 0 to 9.

Referring to the ABSF pattern of FIG. 1, subframes 0, 2, 5, and 7 are general subframes 130, and subframes 1, 3, 4, 6, 8, and 9 are ABSFs 140.

In FIG. 1, the general DCI format 110 indicates scheduling information for the general subframe 130, and the ABSF DCI format 120 indicates scheduling information in the ABSF 140. The generic DCI format 110 and the ABSF DCI format 120 indicate resource allocation 150 information in the generic subframe 130 and the ABSF 140, respectively.

1-1. ABSF DCI Scheduling Instruction Effective Range Embodiment 0

As shown in (a) of FIG. 1, the scheduling information indicated by the ABSF DCI format is valid for the ABSF included until the next general subframe following the general subframe in which the ABSF DCI is transmitted.

Referring to the drawings, in FIG. 1A, the scheduling information included in the ABSF DCI transmitted in the general subframe 0 is valid for the ABSF 1, and the scheduling information included in the ABSF DCI transmitted in the general subframe 2 is valid. The information is valid up to ABSF 3 and ABSF 4. Similarly, the scheduling information included in the ABSF DCI transmitted in the general subframe 5 is valid for the ABSF 6, and the scheduling information included in the ABSF DCI transmitted in the general subframe 7 is valid up to the ABSF 8 and the ABSF 9.

In (a) of FIG. 1, four ABSF DCI formats are transmitted in four general subframes, respectively.

1-2. ABSF DCI Scheduling Instruction Effective Range Embodiment 1

As shown in (b) of FIG. 1, the scheduling information indicated by one ABSF DCI format transmitted in a general subframe is valid for all ABSFs included in the corresponding radio frame.

Referring to the drawings, in FIG. 1B, the scheduling information included in the ABSF DCI transmitted in the general subframe 0 is valid for all ABSFs 1, 3, 4, 6, 8, and 9 in the radio frame. . In all ABSFs, the UE will follow the same scheduling information, including resource allocation, MCS, and the like.

In the above embodiment, only one ABSF-DCI format is transmitted.

2. UE resource allocation method for ABSF

In general, in 3GPP releases 8 to 10, the minimum unit of resource allocation is a resource block (RB). The ABSF DCI format of the present invention may indicate scheduling information using a resource block as a minimum unit of resource allocation, as in the related art.

However, the present invention proposes a new method for reducing control overhead as well as system complexity so that resource allocation is not as complicated as in a general frame, which will be described with reference to FIG. 2.

If the ABSF is set up with data transmission, this data transmission cannot be assigned to any terminal, ie not all terminals can be scheduled within the ABSF given for low power transmission. In special cases such as femto cells, the number of connected terminals is very limited.

In view of these considerations, the present invention proposes ABSF resource allocation indication methods for reducing scheduling overhead when scheduling data transmission in ABSF.

2-1. Resource allocation embodiment 0 for a terminal

As described above for the ABSF-DCI validity range, resource allocation is valid for all ABSFs within a radio frame. The UE will assume the same resource for all ABSFs within the radio frame range indicated in the previous normal frame.

Considering that the number of connected terminals that can be scheduled in the ABSF is very limited, it is preferable that the minimum unit of resource allocation is larger than the RB in order to reduce overhead. According to the resource allocation embodiment 0 of the present invention, resources in the ABSF are divided into a limited number of resource groups, and each resource group is allocated to one terminal in one radio frame.

2-2. Resource allocation embodiment 1 for a terminal

According to the resource allocation Embodiment 1 of the present invention, all resources located in any ABSF may be allocated to only one UE. That is, in any ABSF, resources are allocated to only one terminal. In addition, according to the resource allocation embodiment 1, any terminal may be allocated resources in a plurality of ABSF.

According to resource allocation embodiment 1, a bitmap field for indicating an ABSF to which a resource is allocated may be defined in the ABSF DCI. For example, if six ABSFs are configured in a radio frame, six bits are included in the ABSF DCI to indicate the ABSF allocated to the current UE among the six ABSFs. The length of this field may vary depending on the ABSF configuration of the system or may be fixed to 10 or the maximum possible number of ABSFs within a radio frame.

An example of resource allocation according to the above-described resource allocation embodiment 1 is shown in FIG. 2 (a). As shown in FIG. 2A, subframes 1, 3, 4, 6, 8, and 9 are set as ABSF. And ABSF 1, 8, 9 is assigned to the terminal 1, ABSF 3, 6 is assigned to the terminal 2, ABSF 4 is assigned to the terminal 3. A 6 bit bitmap is sufficient to indicate the allocation within each ABSF-DCI.

2-3. Resource allocation example 2 for a terminal

Resource Allocation for Terminal In Embodiment 1, the unit of resource allocation for a terminal is one ABSF. You can also reduce allocation units to increase the flexibility of resource allocation.

According to Embodiment 2 for resource allocation to a terminal, resources in the ABSF are divided into a limited number of resource groups as described in UE resource allocation Embodiment 0. The system may predefine such one or multiple partitioning resources and partitioning pattern. If there is only one possible partitioned resource, information for indicating a partitioned resource is not necessary. If there are a plurality of partitioned resources, a field for indicating a specific partitioned resource should be defined in the ABSF-DCI.

According to resource allocation embodiment 2, the system divides any ABSF into at least one or more resource groups, and predefines one or a plurality of hopping patterns. The terminals change the resource group used in any ABSF according to a predefined pattern.

FIG. 2B is a diagram illustrating an example of resource hopping according to a terminal resource allocation embodiment 2; FIG. Any ABSF is divided into four resource groups and assigned to four terminals, respectively. The terminal changes the resource group allocated in the next ABSF according to a predetermined jump pattern. In the figure, a simple recursion law is applied to circulate corresponding allocation resource groups of four terminals.

3. MCS (Modulation & Coding Scheme) for ABSF

The MCS level of a specific terminal is determined by link quality. If the signal to noise ratio (SNR) is high, the terminal may communicate with the base station (eNB) at a high data rate using a high code rate and high order modulation. If the SNR is low, the terminal must communicate with the eNB at a low data rate using a low code rate and a low owner's modulation.

When data transmission is made in the ABSF, the transmission power is assumed to be much lower than in a normal frame. The power of the ABSF may be broadcasted through another control signaling or higher layer signaling when necessary. This transmission power level broadcast format may be an absolute power level or a relative power offset for a general subframe.

Since the power level of the ABSF is different from the normal subframe, the MCS level of the ABSF must also be changed accordingly. In conventional systems such as 3GPP Releases 8-10, a 5-bit field is included in the DCI format to define the MCS level for each codeword. One ABSF DCI format can reuse the same MCS definition for an ABSF, and the MCS level will apply to these ABSFs as introduced in the Scope paragraph.

However, given the special nature of ABSF, some alternatives can be considered for defining non-traditional MCS levels to reduce more overhead.

3-1. MCS Instruction Example 0

According to the MCS indication embodiment 0, the ABSF MCS level can be fixed to one of the most robust MCS levels, even though transmission of high data rates is possible. For example, the system can apply MCS = 1 for all ABSFs. According to this embodiment, no indication for ABSF is necessary.

3-2. MCS Instruction Example 1

According to the MCS indication Embodiment 1, the ABSF MCS level may be one of the MCS levels according to the recent wideband CQI feedback of the terminal. The transmitted MCS level need not be the same level of CQI feedback and should be stronger given the low transmit power of the ABSF.

3-3. MCS Directive Example 2

According to the MCS indication Embodiment 2, the ABSF MCS level may be selected from one of the strongest MCS levels. For example, the system uses two bits to indicate MCS levels 1, 2, 3, and 4, and the system may use two bits to indicate MCS levels 1, 3, 5, and 7.

3-4. MCS Instruction Example 3

MCS indication According to Embodiment 3, if the MCS level for the general subframe is available, the ABSF MCS level is indicated as a level that differs from the MCS level of the normal frame by a specific value.

3-5. MCS Instruction Example 4

According to the MCS indication embodiment 4, the ABSF MCS level can be obtained explicitly from the MCS level of the general subframe as well as the ABSF power level if both the MCS level and the ABSF MCS level of the general subframe are available.

If the ABSF power level is quantized to a limited number of levels, the system can use the mapping table (MCS NORMAL , P ABSF ) → MCS ABSF to obtain the ABSF MCS level. Table 1, shown below, shows an example of a mapping rule where the first column is the value of MCS NORMAL and the first row is the ABSF power offset value from the normal frame. Assume four possible ABSF levels. The contents of the table indicate MCS ABSF values, where "NA" means that ABSF data transmission is not possible.

Figure pat00001

It should be noted that the values in Table 1 are presented as an example only, and the detailed values are determined depending on the specific communication system.

In another implementation embodiment, the ABSF MCS may be described as a function of MCS NORMAL and P ABSF , ie MCS ABSF = f (MCS NORMAL , P ABSF ).

In another embodiment, if the current frame / subframe is not valid for MCS ABSF calculation, more parameters may be considered or taken as a substitute for any MCS NORMAL . These parameters should be known to both the base station and the terminal. One of the candidates may be the most recently received wideband CQI feedback from the terminal. This equation can be expressed in particular MCS ABSF = f (CQI WB , MCS NORMAL , P ABSF ) or MCS ABSF = f (CQI WB , P ABSF ) when the MCS NORMAL value is invalid.

MCS Instruction for Multiple Codeword Transmission

When there are multiple codewords (CW) in a normal frame and / or ABSF, there is an assumption to clarify the MCS indication for these embodiments (MCS indication embodiments 3 and 4) according to the MCS level of the general subframes. need. There may be alternatives to define the reference MCS level if there are two MCS values for the general subframe. Table 2 shows an example alternative for each case.

Normal subframe (1 CW) Normal Subframe (2CW) ABSF (1CW) MCS CW1 as reference Alt. 1: mandatory reference as CW1;
Alt. 2: required as min (MCS CW1 , MCS CW2 )
ABSF (2CW) MCS CW1 as reference Alt.1: MCS CW1 as reference to ABSF-MCS CW1 and MCS CW2 as reference to ABSF-MCS CW2
Alt.2: required reference as min (MCS CW1 , MCS CW2 )

3 is a flowchart illustrating an operation sequence of a base station according to an embodiment of the present invention.

First, in step S310, the base station collects not only measurement information transmitted from the terminal for terminal scheduling, but also information reflecting interference and scheduling states between neighbor cells through the X2 interface. In step S320, the base station determines whether to apply ABSF to the system based on the collected information. When determining the ABSF application, the base station determines the ABSF pattern to be applied to the system and broadcasts the system information including the ABSF pattern information.

Subsequently, in step S330, the base station performs scheduling for the general subframe and the ABSF. To this end, if there are terminals to be scheduled in the ABSF, the base station generates a general DCI format and an ABSF DCI format for indicating resource allocation and other transmission characteristics for the scheduled terminals.

In this case, to what extent the scheduling instruction included in the ABSF DCI format is valid, and in which units the resource allocation is performed in the ABSF, it may be according to any one of the above-described embodiments.

In step S340, the base station includes both the general DCI format and the ABSF DCI format in a general subframe and transmits the same to the UE. In step S350, the base station transmits data traffic in the general subframe and the ABSF according to the scheduling information included in the general DCI format and the ABSF DCI format.

4 is a flowchart illustrating an operation sequence of a terminal according to an embodiment of the present invention.

First, in step S410, the terminal performs network access (initial access) to the base station and performs a performance negotiation procedure. During the negotiation procedure, the UE recognizes that the network to which the UE is connected supports the ABSF, and acquires information on the ABSF pattern through higher layer signaling.

In operation S420, the terminal monitors control signaling to obtain downlink scheduling information. If the ABSF is configured, the UE may monitor the PDCCH for ABSF DCI format detection in addition to the general DCI format for general subframe transmission.

The terminal determines whether downlink scheduling information has been acquired in step S430, and if so, proceeds to step S440. In this step, the UE may determine whether resources are allocated to the ABSF through whether the ABSF DCI format is detected when decoding the downlink scheduling information. If no resource is allocated to the ABSF, the terminal proceeds to step S495 and receives and decodes a general subframe as in the prior art.

On the other hand, if the resource is allocated to the ABSF, the terminal proceeds to step S450 to determine the area, that is, the effective area that the ABSF scheduling information. Various embodiments regarding to what extent the scheduling indication included in the ABSF DCI format are valid are as described above.

Subsequently, the terminal proceeds to step S460 to obtain information about a resource allocation method for the ABSF. Since a specific embodiment thereof has been described through various embodiments of the terminal resource allocation method for the ABSF, a detailed description thereof will be omitted.

The terminal proceeds to step S470 to determine the MCS level, and determines other characteristics (eg, HARQ parameters, etc.) for the ABSF scheduling in step S480.

After acquiring the scheduling information for the ABSF through the ABSF DCI format, the terminal proceeds to step S490 to perform downlink data reception for the ABSF according to the obtained transmission characteristic.

5 is a block diagram showing the internal structure of a base station according to an embodiment of the present invention. As shown in FIG. 5, the base station of the present invention may include a wireless communication unit 510, a storage unit 520, and a control unit 530.

The wireless communication unit 510 transmits a control signal to the terminal or transmits and receives data with the terminal. More specifically, the wireless communication unit 510 may be configured as an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low noise amplifying the received signal and down-converting the frequency of the received signal. In addition, the wireless communication unit 310 may receive data through a wireless channel, output the data to the controller 530, and transmit data output from the controller 530 through a wireless channel. According to an embodiment of the present invention, the control signal transmitted from the base station to the terminal includes downlink control information including resource allocation information, higher layer signaling including information on whether ABSF is applied, ABSF pattern, and the like.

The storage unit 520 may store programs and data necessary for the base station to operate according to an embodiment of the present invention. The storage unit 520 temporarily stores information necessary for scheduling a terminal obtained from a neighbor cell or a terminal, and may later use it when allocating resources for the terminal.

The controller 530 controls the signal flow between each block to operate the base station according to an embodiment of the present invention. More specifically, the controller 530 generates a general DCI format including resource allocation information for the general subframe, and an ABSF DCI format including resource allocation information for the ABSF. In this case, to what extent the scheduling instruction included in the ABSF DCI format is valid, and in which units the resource allocation is performed in the ABSF, it may be according to any one of the above-described embodiments. The controller 530 controls the general DCI format and the ABSF DCI format to be transmitted to the terminal through the general subframe.

According to an embodiment of the present invention, the controller 530 may further include an ABSF application determining unit 531 and a scheduler 532.

The ABSF application determination unit 531 collects information reflecting interference and scheduling states between neighbor cells as well as measurement information transmitted from the terminal for UE scheduling. The ABSF application determination unit 531 determines whether to apply ABSF to the system based on the collected information. When determining the ABSF application, the ABSF application determination unit 531 determines the ABSF pattern to be applied to the system. And broadcast system information including the ABSF pattern information.

The scheduler 532 allocates resources for the normal subframe and the ABSF when it is determined to apply the ABSF to the system. The scheduler 532 generates a general DCI format including resource allocation information for the general subframe, and an ABSF DCI format including resource allocation information for the ABSF. The scheduler controls the general DCI format and the ABSF DCI format to be transmitted to the UE through the general subframe.

6 is a block diagram showing the internal structure of a terminal according to an embodiment of the present invention. As shown in FIG. 6, the terminal of the present invention may include a wireless communication unit 610, a storage unit 620, and a control unit 630.

The wireless communication unit 610 receives a control signal transmitted from the base station or transmits and receives data with the base station. More specifically, the wireless communication unit 510 may be configured as an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low noise amplifying the received signal and down-converting the frequency of the received signal. In addition, the wireless communication unit 310 may receive data through a wireless channel, output the data to the controller 530, and transmit data output from the controller 530 through a wireless channel.

The storage unit 620 may store programs and data necessary for the terminal to operate according to an embodiment of the present invention.

The controller 630 controls the signal flow between each block to operate the terminal according to an embodiment of the present invention. More specifically, the controller 630 controls to receive a general subframe including both a general DCI format including resource information for the general subframe and an ABSF DCI including resource information for the ABSF. The control unit 630 controls to receive and decode the general subframe and the ABSF according to the received general DCI format and the ABSF DCI format.

According to the present invention described above, since the low-power data transmission is scheduled in the ABSF and data transmission is performed through this, limited resources can be used more efficiently than the prior art in which the ABSF does not transmit data.

The embodiments of the present invention disclosed in the present specification and drawings are intended to be illustrative only and not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

[Base station]
510: wireless communication unit 520: storage unit
530: control unit 531: ABSF application determination unit
532: scheduler
[Terminal]
610: wireless communication unit 620: storage unit
630 control unit 631 ABSF DCI detection unit
632 data processing unit

Claims (20)

  1. A method for allocating a resource in a base station in a wireless communication system for transmitting a radio frame divided into a plurality of subframes including at least one first subframe and at least one second subframe,
    Generating first downlink control information including resource allocation information for the first subframe;
    Generating second downlink control information including resource allocation information for the second subframe; And
    Transmitting the first downlink control information and the second downlink control information to the terminal through the first subframe;
    The transmit power for the second subframe is smaller than the transmit power for the first subframe.
  2. The method of claim 1, wherein the second downlink control information,
    And a second subframe included until the next subframe following the first subframe in which the second downlink control information is transmitted.
  3. The method of claim 1, wherein the second downlink control information,
    And all the second subframes included in any radio frame are valid.
  4. The method of claim 1, wherein the second subframe,
    The resource allocation method is divided into a plurality of resource groups, wherein each resource group is allocated to one terminal in one radio frame.
  5. The method of claim 1, wherein the second subframe,
    Resource allocation method, characterized in that the resource is allocated to only one terminal.
  6. A method for acquiring resource allocation information of a terminal in a wireless communication system for transmitting a radio frame divided into a plurality of subframes including at least one first subframe and at least one second subframe,
    Receiving a first subframe including first downlink control information for the first subframe and second downlink control information for the second subframe; And
    Receiving and decoding the first subframe and the second subframe according to the received first downlink control information and the second downlink control information;
    The transmit power for the second subframe is smaller than the transmit power for the first subframe.
  7. The method of claim 6,
    The second downlink control information,
    And the second subframe included until the next subframe following the first subframe in which the second downlink control information is transmitted is valid.
  8. The method of claim 6, wherein the second downlink control information,
    Method for obtaining resource allocation information, characterized in that valid for all second subframes included in any radio frame.
  9. The method of claim 6, wherein the second subframe,
    The resource allocation information obtaining method is divided into a plurality of resource groups, wherein each resource group is allocated to one terminal in one radio frame.
  10. The method of claim 6, wherein the second subframe,
    Resource allocation information acquisition method, characterized in that the resource is allocated to only one terminal.
  11. A base station for allocating resources in a wireless communication system for transmitting a radio frame divided into a plurality of subframes including at least one first subframe and at least one second subframe,
    Wireless communication unit for transmitting and receiving a control signal or data with the terminal; And
    Generating first downlink control information including resource allocation information for the first subframe, and generating second downlink control information including resource allocation information for the second subframe; And a control unit for controlling to transmit the first downlink control information and the second downlink control information to the terminal through the first subframe.
    And a transmit power for the second subframe is smaller than a transmit power for the first subframe.
  12. The method of claim 11, wherein the second downlink control information,
    And a base station valid for a second subframe included until a first subframe subsequent to a first subframe in which the second downlink control information is transmitted.
  13. The method of claim 11, wherein the second downlink control information,
    And a base station valid for all second subframes included in any radio frame.
  14. The method of claim 11, wherein the second subframe,
    The base station is divided into a plurality of resource groups, wherein each resource group is allocated to one terminal in one radio frame.
  15. The method of claim 11, wherein the second subframe,
    The base station, characterized in that resources are allocated to only one terminal.
  16. A terminal receiving resources from a base station in a wireless communication system for transmitting a radio frame divided into a plurality of subframes including at least one or more first subframes and at least one or more second subframes,
    A wireless communication unit for transmitting and receiving a control signal or data with the base station; And
    Receiving a first subframe including first downlink control information for the first subframe and second downlink control information for the second subframe, and receiving the received first downlink control information and a second A control unit for controlling to receive and decode the first subframe and the second subframe according to downlink control information,
    The transmit power for the second subframe is smaller than the transmit power for the first subframe.
  17. The method of claim 16,
    The second downlink control information,
    And a second subframe included until the first subframe following the first subframe in which the second downlink control information is transmitted.
  18. The method of claim 16, wherein the second downlink control information,
    And a terminal valid for all second subframes included in any radio frame.
  19. The method of claim 16, wherein the second subframe,
    A terminal is divided into a plurality of resource groups, wherein each resource group is assigned to one terminal in one radio frame.
  20. The method of claim 16, wherein the second subframe,
    Terminal is characterized in that the resource is allocated to only one terminal.
KR1020110107783A 2010-11-09 2011-10-21 Method and apparatus for allocating resource in wireless communication system KR20120049804A (en)

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US61/411,602 2010-11-09

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170018517A (en) * 2015-08-10 2017-02-20 주식회사 케이티 Schedulling apparatus and method for assigning resource thereby
US10306568B2 (en) 2014-04-02 2019-05-28 Lg Electronics Inc. Method for transceiving signal in wireless communication system and apparatus therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10306568B2 (en) 2014-04-02 2019-05-28 Lg Electronics Inc. Method for transceiving signal in wireless communication system and apparatus therefor
KR20170018517A (en) * 2015-08-10 2017-02-20 주식회사 케이티 Schedulling apparatus and method for assigning resource thereby

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