KR101240352B1 - Apparatus and method for allocating resource in wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for allocating a resource for improving data transmission efficiency using a plurality of channels in a wireless local area network (WLAN) communication system. Or preset a plurality of non-contiguous channels into a single sub-channel group, or preset a specific pattern or a plurality of channels into a single sub-channel group, A setting unit configured to pre-set a plurality of channels as one subchannel group in a specific pattern or arbitrarily after grouping in a pair or a predetermined number; And an allocator configured to allocate the preset subchannel group to the corresponding terminal according to a channel allocation request from a terminal.

Wireless LAN, Wireless LAN, Resource Allocation

Description

Apparatus and method for allocating resource in wireless communication system

The present invention relates to a communication system, and more particularly, a resource for improving data transmission efficiency using a plurality of channels in a wireless local area network (WLAN) communication system. The present invention is derived from a study conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task No. 2006-S-002-03, Title: Development of 3Gbps 4G Wireless LAN System]. "

In the current wireless communication system, active research is being conducted to provide users with services having high quality of service (QoS: Quality of Service, hereinafter referred to as 'QoS'). In particular, researches on WLAN communication systems are being actively conducted through the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. Among the IEEE 802.11 standards, access points (APs) are referred to as "AP." Research into the IEEE 802.11 standard that does not require cabling is being actively conducted.

In addition, in the current wireless communication system, data for efficiently transmitting data using limited resources, such as frequency (or channel) resources, code resources, time slot resources, and the like, is efficiently used. Transmission schemes and resource allocation schemes have been proposed.

Meanwhile, in a WLAN communication system defined in the IEEE 802.11 standard, a basic service set (BSS) is referred to as a basic building block of an IEEE 802.11 network, and is wired to a wired network. And APs for providing communication services, and stations (hereinafter, referred to as STAs or terminals) that receive communication services from the APs.

In addition, in a WLAN communication system, STAs of an independent basic service set (IBSS) may be directly communicated with other communication devices in another communication area. In the IBSS, each mobile node selects an available channel and communicates with each other. In this case, data is transmitted through one wireless channel. In addition, the WLAN communication system uses different radio channels between different IBSSs to avoid channel collisions, and does not transmit data through multiple channels. That is, the IBSS transmits data using only one radio channel.

In the WLAN BSS, an infrastructure BSS (APS) selects one of a plurality of available channels to communicate with several STAs. In particular, in WLAN communication systems, bandwidth is increased (eg, 20 MHz to 40 MHz) to increase data transmission speed, and media access control (MAC) is referred to as 'MAC' / physical (PHY). PHYsical (hereinafter referred to as 'PHY') Various techniques for improving data throughput through the technology at the layer have been proposed. In particular, in the infrastructure BSS, the AP is used to increase the data transmission rate (ie, data throughput) by using a multi-input multi-output (MIMO) method. However, this is limited, and therefore, there is a need for a resource allocation method for increasing data throughput by efficiently using limited resources.

Accordingly, an object of the present invention is to provide an apparatus and method for allocating resources in a wireless communication system.

In addition, another object of the present invention is to provide an apparatus and method for allocating a resource to improve data throughput by efficiently using limited resources (for example, channels) available in a WLAN.

In addition, another object of the present invention is to provide an apparatus and method for allocating a resource for improving data transmission efficiency using a plurality of channels in a wireless communication system.

The apparatus of the present invention for achieving the above objects, in the resource allocation apparatus, a plurality of contiguous or non-contiguous channels of a plurality of available channels, one sub-channel group (sub) -channel group), or preset a specific pattern or randomly a plurality of channels into one subchannel group, or group in a pair or a predetermined number and then a specific pattern or randomly multiple channels A setting unit which presets a single subchannel group; And an allocator configured to allocate the preset subchannel group to the corresponding terminal according to a channel allocation request from a terminal.

In accordance with an aspect of the present invention, there is provided a method of allocating a plurality of contiguous or non-contiguous channels in one subchannel among a plurality of available channels. Pre-set to a sub-channel group, or a specific pattern or arbitrarily preset a plurality of channels into a single sub-channel group, or group in a pair or a predetermined number and then a specific pattern or randomly Presetting a plurality of channels into one subchannel group; And allocating the preset subchannel group to the corresponding terminal according to a channel allocation request from the terminal.

The present invention can efficiently use a limited channel by adaptively allocating a plurality of different channels among a plurality of channels available in a wireless communication system when there are a plurality of wireless channels, and also through the limited channel. By improving the transmission rate (data throughput), you can maximize the performance of your system.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention relates to a wireless communication system, for example, IEEE of Institute of Electrical and Electronics Engineers (IEEE) 802.11 (eg, IEEE 802.11a / b), which is a broadband wireless access (BWA) communication system. We propose an apparatus and method for allocating resources in a system. Here, in the embodiment of the present invention to be described later, for convenience of description, the wireless communication system is a wireless local area network (WLAN) communication system, hereinafter referred to as an IEEE 802.11a / b system as an example. Although described below, the resource allocation apparatus and method proposed by the present invention can be applied to other communication systems.

In addition, the present invention, a plurality of channels available in a wireless communication system is referred to as a base station (BS) (hereinafter referred to as "BS") or an access point (AP: Access Point, "AP" In addition, the present invention proposes a resource allocation apparatus and method for adaptively allocating an AP to a terminal. Here, in the embodiment of the present invention, one BS or AP in the IEEE 802.11b system that can use three radio channels and the IEEE 802.11a system that can use 12 radio channels to improve the speed of transmission data The present invention proposes an apparatus and method for allocating a plurality of channels to a terminal.

In an embodiment of the present invention to be described later, the bandwidth of the data transmission channel is increased to improve the transmission speed of data in the IEEE 802.11a / b system, particularly in the IEEE 802.11a system which can use more wireless channels. Or adaptively allocate channels to use multiple channels simultaneously. In addition, in an embodiment of the present invention, in a situation where a plurality of channels exist, a system requiring a wide bandwidth such as a WLAN communication system is difficult to secure a plurality of channels of continuous frequency, but by assigning a plurality of channels that are not continuous, Improves data transmission speed between APs and stations receiving a communication service from the APs (hereinafter, referred to as STAs).

At this time, in the embodiment of the present invention, the bandwidth of each channel allocated by each of the BS or AP may be different from each other, for example, the channel may be allocated and used in a mixed state of the 20 MHz band and the 40 MHz band. BS or AP allocates and uses a plurality of channels to the terminal. Next, a resource allocation apparatus in the wireless communication system to which the present invention is applied will be described in detail with reference to FIG. 1.
1 is a configuration diagram of an apparatus for allocating a resource of a wireless communication system to which the present invention is applied. 1 is a diagram illustrating a scheduler performing a resource allocation function in a wireless communication system, wherein the scheduler may be present in BSs or APs included in the wireless communication system or above the BSs or APs. have.

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Referring to FIG. 1, the scheduler 100 may determine information on resources available to the wireless communication system (ie, channel information) and information on APs (ie, AP information) included in the wireless system. Confirming unit 110 for confirming, the allocation unit 120 for adaptively allocating a plurality of channels according to the channel information and AP information confirmed by the confirmation unit 110, and the channel allocation of the allocation unit 120 And a generation unit 130 for generating corresponding allocation information and transmitting the APs to APs, respectively. Here, the generation unit 130 may generate MAP information with allocation information.

The identification unit 110 may determine the number of channels available in the wireless communication system and the bandwidth of the channel (for example, three channels of the IEEE 802.11b system or 12 channels of the IEEE 802.11a system) through the channel information. The number of APs used to receive the identified channels and the bandwidth of the channels requested by the terminals are checked through the AP information. The channel information and the AP information may be received from a server managing and controlling a wireless communication system. On the other hand, the check unit 110 may be implemented to check the channel allocation request from the terminal.
The allocator 120 adaptively allocates a plurality of channels according to the number of APs available and the bandwidth of the channel requested by the terminals (or according to a channel allocation request from the terminal). In this case, the allocator 120 presets a plurality of channels of contiguous or non-contiguous frequencies in a plurality of available channels as one sub-channel group. Assigns a predetermined pattern or randomly (ie, randomly) a plurality of channels to one sub-channel group and assigns them. In addition, the allocation unit 120, after grouping the plurality of available channels in a pair (pair) or a predetermined number, a specific pattern or a plurality of channels arbitrarily a sub-channel group (sub-channel group) Preset and assign with.

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In this case, the allocator 120 continuously sets a plurality of channels having a specific bandwidth in advance and sets them as one sub-channel group (the “setter” not shown in the drawing). The subchannel group suitable for the terminal is allocated according to the channel allocation request from the terminal. The bandwidths of the channels allocated to each terminal may have the same size, but more preferably, may have different sizes according to channel conditions and preferences of terminals for each channel. Next, a resource allocation method in the wireless communication system according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 2.

2 is a diagram schematically illustrating a resource allocation operation of a resource allocation apparatus of a wireless communication system to which the present invention is applied.

Referring to FIG. 2, in operation 210, the scheduler identifies AP information using channel information and information on APs included in the wireless system as information on resources available to the wireless communication system. Here, the number and bandwidth of available channels in the wireless communication system are identified through the channel information, and the number of APs that are allocated and used by the identified channel through the AP information and the bandwidth of channels requested by the terminals are allocated. Check it. On the other hand, the scheduler may be implemented to check the channel allocation request from the terminal.

Next, the scheduler adaptively allocates a plurality of channels to each terminal in response to the channel information and the AP information identified in step 220 (or according to a channel allocation request from the terminal). Here, channel allocation will be described in more detail with reference to FIGS. 3 to 5 below, and a detailed description thereof will be omitted herein.

In operation 230, the scheduler generates allocation information corresponding to the channel allocation and transmits the allocation information to the APs. Next, channel allocation in the wireless communication system according to an exemplary embodiment of the present invention will be described in more detail with reference to FIGS. 3 to 5.

3 to 5 are diagrams illustrating an example of a channel allocation operation in a resource allocation apparatus of a wireless communication system according to an exemplary embodiment of the present invention. 3 is a diagram illustrating available channels that can be used by the IEEE 802.11a system in the wireless channels Band A, B, C, and D, respectively. 4 shows that one AP intends to use a plurality of channels simultaneously in all available frequency channels available to the IEEE 802.11a system (that is, when one channel to be allocated by one AP is a plurality of channels). FIG. 1 shows an example of channel allocation. In addition, FIG. 5 is a diagram illustrating an example in which an AP allocates a channel having a plurality of different bandwidths when a channel having a different bandwidth exists in a channel available for the IEEE 802.11a system.

As shown in FIG. 3, the scheduler of the IEEE 802.11a system allocates an available channel to terminals to transmit / receive data among a plurality of channels existing in each radio channel band. For example, when one AP allocates a channel number 40 and communication between the AP and STAs is performed (i.e., data transmission and reception), the AP and the neighboring AP are to remove mutual interference. A frequency channel of a band different from the AP is allocated and used. At this time, in order to improve the data transmission rate, a channel having a bandwidth of 40 MHz may be allocated to transmit / receive data.

In addition, as shown in FIG. 4, the scheduler combines various types of cases as described above to allocate channel assignments (continuous channel assignment, arbitrary channel assignment, patterned channel assignment, pair and patterned channel assignment, pair and Random channel allocation, etc.), a plurality of channel numbers are assigned to one UE to perform communication between the AP and the STAs. In FIG. 4, only a channel having a bandwidth of 20 MHz is described. However, even when there are a plurality of channels having different bandwidths as in FIG. 5, the same allocation can be performed to perform communication. In addition, the scheduler may sequentially set a plurality of channels having a specific bandwidth in advance and set them as one sub-channel group, and allocate the sub-channel group suitable for each terminal to each AP and STAs. Allow communication between them.

As shown in FIG. 5, the scheduler allocates a plurality of channels of different frequency bands (for example, a channel having a bandwidth of 20 MHz, a channel having a bandwidth of 40 MHz, etc.) to one terminal to perform communication between the AP and the STAs. Be sure to

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a configuration diagram of an apparatus for allocating a resource of a wireless communication system to which the present invention is applied;

2 is a diagram schematically illustrating a resource allocation operation of a resource allocation apparatus of a wireless communication system to which the present invention is applied;

3 to 5 are diagrams illustrating an example of a channel allocation operation in a resource allocation apparatus of a wireless communication system according to an exemplary embodiment of the present invention.

Claims (16)

delete delete delete delete delete In the resource allocation apparatus, Among a plurality of available channels, a plurality of contiguous or non-contiguous channels may be preset in a single sub-channel group, or a plurality of channels may be arbitrarily selected in a specific pattern or arbitrarily. A setting unit presetting one subchannel group, grouping a pair or a predetermined number, and then presetting a specific pattern or a plurality of channels to one subchannel group in advance; And An allocator for allocating the preset subchannel group to the corresponding terminal according to a channel allocation request from a terminal. Resource allocation apparatus comprising a. The method according to claim 6, And the plurality of channels have the same bandwidth as each other. The method according to claim 6, And the plurality of channels have different bandwidths. delete delete delete delete delete In the resource allocation method in the base station, Among a plurality of available channels, a plurality of contiguous or non-contiguous channels may be preset in a single sub-channel group, or a plurality of channels may be arbitrarily selected in a specific pattern or arbitrarily. Presetting to one subchannel group, grouping a pair or a predetermined number, and then presetting a specific pattern or a plurality of channels to one subchannel group in advance; And Allocating the preset subchannel group to a corresponding terminal according to a channel allocation request from a terminal; Resource allocation method comprising a. 15. The method of claim 14, And the plurality of channels have the same bandwidth as each other. 15. The method of claim 14, And the plurality of channels have different bandwidths.

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