KR20080092780A - Method, apparatus and system for allocating wireless resource for use in mobile multihop relay system - Google Patents

Abstract

A method, an apparatus, and a system for allocating radio resources in an MMR(Mobile Multi-hop Relay) system are provided to allocate radio resources efficiently through load balancing by transmitting BS(Base Station)-to-MS(Mobile Station) traffic to an MS by means of the radio resources of a BS-to-RS(Relay Station) section in case the BS-to-MS traffic is larger than the radio resources of a BS-to-MS section. If BS-to-MS traffic, which will be transmitted to an MS through a BS-to-MS section, is generated, a BS allocates the BS-to-MS traffic to the BS-to-MS section(S410). At this moment, the BS confirms whether the BS-to-MS traffic is larger than the radio resources of the BS-to-MS section(S420). If the BS-to-MS traffic is larger than the radio resources of the BS-to-MS section, the BS checks the radio resources of a BS-to-RS section and confirms whether redundant radio resources exist at the BS-to-RS section(S430). If no redundant radio resource exists, the BS allocates the rest of the BS-to-MS traffic, which remains after being allocated to the BS-to-MS section, to the BS-to-MS section of the next frame(S440). However, in case redundant radio resources exist, the BS allocates the remaining traffic to the redundant radio resources and transmits it to the MS through the BS-to-RS section(S450).

Description

Method, apparatus and system for allocating radio resources in mobile multihop relay system {Method, Apparatus and System for Allocating Wireless Resource for Use in Mobile Multihop Relay System}

1 is a conceptual diagram briefly showing a conventional MMR system,

2 is a conceptual diagram illustrating a downlink frame structure of a conventional MMR system;

3 is a block diagram schematically illustrating a radio resource allocation system in an MMR system according to an embodiment of the present invention;

4 is a flowchart illustrating a radio resource allocation method in an MMR system according to an embodiment of the present invention;

5 is a conceptual diagram illustrating a downlink frame structure of an MMR system according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110, 310: BS 120, 320: RS

130, 330: MS 210: 'BS to MS section'

220: 'BS → RS section' 230: 'RS → MS section'

312: resource management unit 314: traffic allocation unit

The present invention relates to a radio resource allocation method, apparatus, and system in a mobile multihop relay (MMR) system. More specifically, in an MMR system which is a relay communication system in which a relay device is added to a mobile communication system, a base station (BS: hereinafter referred to as "BS") from a base station (MS: Mobile Station, hereinafter ' If the traffic to be allocated to the MS (hereinafter referred to as 'BS → MS traffic') is greater than the radio resource of the interval between the BS and the MS (hereinafter referred to as 'BS → MS interval'), the BS and the relay device (RS) By transmitting the remaining 'BS → MS traffic' to the MS by using the radio resources of the interval between the Station (hereinafter referred to as 'RS') (hereinafter, referred to as 'BS → RS interval'), the downlink load is distributed to distribute the radio resources. A method, apparatus and system for allocating a system.

The mobile communication system has been developed through the first generation analog AMPS (Advanced Mobile Phone System) method and the second generation cellular (Cellular) / Personal Communication Service (PCS) method. The third generation mobile communication system IMT-2000 (International Mobile Telecommunication 2000), which is enacted as a standard in ITU-R, is commercially available. In addition, a mobile Internet system that can use a high-speed wireless Internet service at a low rate while moving, has emerged.

The portable internet system uses various types of portable devices such as laptops, PDAs, and handheld PCs to access various information and contents by accessing the Internet in indoor and outdoor stationary environments and mobile environments at walking speeds and low to medium speeds. It is a service. In addition, IP-based wireless data system that provides mobility of 60 km / h per hour, provides downlink transmission speed of 24 Mbps, and can provide downlink transmission speed of 50 Mbps by applying Multiple Input Multiple Output (MIMO) system. to be.

In addition, the portable Internet system uses a 2.3 GHz frequency band, and draws a time division duplex (TDD) by a duplex method and a multiple access method to effectively use the allocated frequency spectrum. Orthogonal Frequency Division Multiple Access (OFDMA) is used.

On the other hand, unlike the direct communication method between the base station, i.e., the BS and the terminal, i.e., the MS such as the aforementioned mobile communication system or the portable Internet system, the MMR, which is being standardized in a task group called 'IEEE 802.16j' Relay communication has been proposed.

1 is a conceptual diagram briefly illustrating a conventional MMR system.

In a mobile communication system such as a portable Internet system, a base station, that is, a BS 110, is disposed in a service area to transmit and receive data to and from a terminal, that is, the MS 130, through the BS 110. Accordingly, the MS 130 may transmit / receive data with the BS 110 only when located within the coverage of the BS 110 and when not in the radio shadow area.

That is, when the MS 130 is not located within the coverage of the BS 110 or is located in a coverage area that does not receive radio waves from the BS 110, such as a basement or a building concentrated area, even if located within the coverage of the BS 110 You cannot send or receive data with it.

In order to solve this problem, in the MMR system, the RS 120 is provided to eliminate the radio shadow area and expand coverage. That is, the MS 130 provides a service by distributing a plurality of RSs 120 within the coverage of the BS 110 so as to receive data from any one of the RSs 120 or the BS 110 arranged in various places. Increase the coverage and transmission speed you can receive.

2 is a conceptual diagram illustrating a downlink frame structure of a conventional MMR system.

In the conventional MMR system, each downlink is divided into a 'BS → MS section' 210, a 'BS → RS section' 220, and a 'RS → MS section' 230 in each frame. A radio resource (time or frequency) for broadcasting preamble and MAP information and a radio resource for allocating traffic are allocated to 230. Here, 'BS → MS section' 210, 'BS → MS traffic', 'BS → RS section' 220, 'BS → RS traffic', 'RS → MS section' 230 'RS → MS Traffic 'is assigned to radio resources for each traffic.

Here, the preamble includes information for synchronizing, and the map information includes information for designating a radio resource allocated to data to be transmitted. That is, BS 110 allocates 'BS → MS traffic' and 'BS → RS traffic' to 'BS → MS section' 210 and 'BS → RS section' 220 and preamble and map information of each section. When broadcasting, the MS 130 synchronizes with the BS 110 using a preamble broadcast through the BS to MS section 210, and then uses a map information to transmit a radio resource assigned to the section. 'BS → MS traffic' is received, and the RS 120 synchronizes with the BS 110 using a pream broadcasted through the 'BS → RS section' 220, and then uses the corresponding map section using the map information. Receives 'BS → RS traffic' through the radio resources specified in the RS, RS 120 again allocates the 'RS → MS traffic' to the 'RS → MS interval' 230, and then the midamble (Midamble) and map By broadcasting the information, the MS 130 may receive the 'RS → MS traffic' through the 'RS → MS interval' 230.

In the MMR system, the downlink is divided into sections, as described above, so that the BS 110 and the RS 120 simultaneously transmit downlink traffic to the MS 130, thereby increasing the coverage that can be communicated. There is an advantage to increase the use efficiency.

On the other hand, in the conventional MMR system, if the BS 110 operates by varying the 'BS → RS interval' 220 in units of frames, the load may be distributed according to the traffic conditions of the BS 110, but the actual operation Due to the limitation of the switching according to the time division duplex, there is a problem in that the 'BS → RS section' 220 cannot be operated by varying the frame unit.

As such, when the BS BS RS section 220 is fixedly operated, if the BS BS traffic is insufficient compared to the radio resources allocated to the BS BS section 220, the BS → RS section 220 is used. Unnecessary waste of radio resources may occur in operation 220, and thus there is a problem in that operational inefficiencies that do not efficiently operate expensive radio resources occur.

In order to solve this problem, the present invention, in the MMR system which is a relay communication system in which a relay device is added to the mobile communication system, when the 'BS → MS traffic' is larger than the radio resources of the 'BS → MS interval, The main purpose of the present invention is to provide a method, apparatus, and system for allocating the radio resources by distributing the downlink load by transmitting the remaining 'BS → MS traffic' to the MS by using the radio resources of the 'BS → RS interval'. There is this.

In order to achieve the above object, the present invention provides a base station (BS: Base Station, hereinafter referred to as 'BS'), a relay device (RS: Relay Station, hereinafter referred to as 'RS'), and a mobile terminal (MS: Mobile Station, hereinafter). In a mobile multihop relay (MMR) system including a 'MS'), the BS allocates radio resources to traffic to be transmitted to the MS. Allocating BS to MS traffic to a radio resource of a BS to MS interval; (b) checking whether the 'BS → MS traffic' is greater than the radio resource of the 'BS → MS interval'; (c) checking whether there is an extra radio resource in the BS-RS section when the BS-MS traffic is larger than the radio resource in the BS-MS section; And (d) if there is an extra radio resource in the 'BS → RS section', allocating the remaining 'BS → MS section' and allocating the remaining 'BS → MS section' to the 'BS → RS section'. A radio resource allocation method in an MMR system is provided.

According to another object of the present invention, in a mobile multihop relay (MMR) system, a base station (BS) is referred to as a mobile terminal. (MS: Mobile Station, hereinafter referred to as 'MS') Allocates traffic to a radio resource of 'BS → MS section', and 'BS → MS traffic' is larger than the radio resource of 'BS → MS section' If there is an extra radio resource in the relay device (RS) section, the remaining BS and MS traffic is allocated to the BS to MS section. BS assigned to; An RS that receives the 'BS → RS traffic' allocated to the 'BS → RS interval' and relays the 'RS → MS traffic' through the 'RS → MS interval'; And an MMR receiving 'BS → MS traffic' from the BS through the 'BS → MS interval' and receiving the remaining 'BS → MS traffic' from the BS through the 'BS → RS interval'. It provides a radio resource allocation system in the system.

In addition, according to another object of the present invention, a mobile multi-hop relay including a relay device (RS) (hereinafter referred to as "RS") and a mobile terminal (MS: Mobile Station, referred to as "MS") ( MMR: Mobile Multihop Relay (hereinafter referred to as "MMR") system of the base station (BS: Base Station, referred to as "BS") as a device for allocating radio resources to traffic to be transmitted to the MS, 'BS → MS interval' And 'BS → MS traffic' or 'BS → MS traffic' to 'BS → RS section', and if the remaining 'BS → MS traffic' is allocated to 'BS → RS section' A traffic allocator configured to designate that the remaining 'BS → MS traffic' is allocated to the 'BS → RS interval' in the map (MAP) information of the mobile terminal; And using the radio resources of the 'BS → MS section' and the radio resources of the 'BS → RS section' so that the 'BS → MS traffic' is larger than the radio resources of the 'BS → MS section' If there is an extra radio resource in the radio resource of ', the traffic allocator allocates' BS → MS traffic' in the 'BS → MS section' and allocates the remaining 'BS → MS traffic' in the 'BS → RS section'. Provided is a radio resource allocation apparatus in an MMR system, characterized in that it comprises a resource management unit for controlling.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

3 is a block diagram schematically illustrating a radio resource allocation system in an MMR system according to a preferred embodiment of the present invention.

A radio resource allocation system in a mobile multihop relay (MMR) system according to a preferred embodiment of the present invention is a base station (BS: hereinafter referred to as BS, 310). , A relay device (RS) (hereinafter referred to as 'RS', 320) and a mobile terminal (MS: Mobile Station, referred to as 'MS', 330).

BS 310 is a base station of the MMR system, the radio resources for transmitting traffic, such as data transmitted to the MS 330 'BS → MS section' 210, 'BS → RS section' 220 and ' RS → MS section '230, which is operated by' BS → MS section '210,' BS → MS traffic ',' BS → RS section '220,' BS → RS traffic ',' RS → MS section 230 transmits traffic to MS 330 by allocating 'RS → MS traffic'.

BS 310 according to a preferred embodiment of the present invention when 'BS → MS traffic' is allocated to the 'BS → MS interval' 210, 'BS → MS traffic' is 'BS → MS interval' 210 Check whether the radio resource is greater than the radio resources of the 'BS → MS traffic' is greater than the radio resources of the 'BS → MS interval' 210, whether there is excess radio resources in the 'BS → RS interval' (220) If there is an extra radio resource in the 'BS → RS section' 220, the remaining 'BS → MS traffic' is allocated to the 'BS → RS section' 220 and transmitted.

Here, the remaining 'BS → MS traffic' refers to the remaining 'BS → MS traffic' after allocating 'BS → MS traffic' to the 'BS → MS section' 210. That is, since the radio resources of the 'BS → MS section' 210 are smaller than the 'BS → MS traffic', all 'BS → MS traffic' cannot be allocated to the 'BS → MS section' 210, so that some ' Only BS → MS traffic will be allocated to 'BS → MS interval' 210, and 'BS → MS traffic' except for 'BS → MS traffic' of a part of all 'BS → MS traffic' MS traffic '.

In addition, BS 310 according to a preferred embodiment of the present invention, if there is no excess radio resources in the 'BS → RS section' 220, the remaining 'BS → MS traffic' is the 'BS → RS section' of the next frame Allocates to 220 to transmit.

In addition, BS 310 according to a preferred embodiment of the present invention is the 'BS → MS interval' is the remaining 'BS → MS traffic' in the map (MAP: Mobile Application Protocol) information of the 'BS → MS interval' 210 220, the MS 330 receives map (MAP: Mobile Application Protocol) information of the BS to MS section 210 so that the remaining BS to MS traffic is received from the BS to RS section. Recognized that the allocation has been made to the 220, and receives the remaining 'BS → MS traffic' through the 'BS → RS interval' (220).

To this end, the BS 310 according to the preferred embodiment of the present invention includes a resource manager 312 and a traffic allocator 314.

Here, the resource management unit 312 grasps the usage status of the radio resources of the 'BS → MS section' 210, compares the radio resources of the 'BS → MS section' 210 and 'BS → MS traffic' ' Check whether the BS → MS traffic is greater than the radio resources of the BS → MS interval 210, and if the BS → MS traffic is greater than the radio resources of the BS → MS interval 210, BS → Check the status of the use of radio resources in the RS section '220 to determine whether there is an extra radio resource, and if there is no excess radio resource, the traffic allocator 314 causes the' BS → MS section '( 'BS → MS traffic' is assigned to the control unit 210 and the remaining 'BS → MS traffic' is allocated to the 'BS → MS section' 210 of the next frame, and if there is excess radio resources, the traffic allocator ( 314) allocates 'BS → MS traffic' to the 'BS → MS interval' 210 and the remaining 'BS → MS traffic' is allocated to the 'BS → RS interval' (220).

In addition, the traffic allocator 314 is controlled by the resource manager 312, 'BS → MS section' 210 and 'BS → RS section' 220, 'BS → MS traffic' or the remaining 'BS → MS Traffic ', and when the remaining' BS → MS section 'is allocated to the' BS → RS section '220, the' BS → RS section '220 is included in the map information of the' BS → MS section '210. Specifies that the rest of 'BS → MS traffic' has been assigned.

RS 320 is a relay device of the MMR system, and receives 'BS → RS traffic' transmitted through the 'BS → RS section' 220 and receives 'RS → MS traffic' through the 'RS → MS section' 230. Is relayed to the MS 330.

The MS 330 is a mobile terminal of the MMR system, and receives the traffic transmitted from the BS 310 directly from the BS 310 through the BS → MS interval 210 or receives the RS → MS interval 230. It is relayed from the RS 320 through.

The MS 330 according to a preferred embodiment of the present invention checks the map information broadcast through the 'BS → MS section' 210, and the 'BS → RS section' 220 in the map information and the remaining 'BS → If it is specified that MS traffic has been allocated, the remaining 'BS → MS traffic' is received through the radio resource designated in the corresponding section.

4 is a flowchart illustrating a radio resource allocation method in an MMR system according to a preferred embodiment of the present invention.

BS 310 receives 'BS → MS traffic' to be transmitted through the 'BS → MS section' 210 of the data, such as data to be transmitted to the MS 330, 'BS → MS section' 210 → 'MS traffic' is allocated (S410). At this time, the BS 310 checks the radio resources of the 'BS → MS section' 210 and checks whether the 'BS → MS traffic' is greater than the radio resources of the 'BS → MS section' 210 (S420). .

BS 310 determines that the BS → MS traffic is 'BS → MS traffic' 210 when the BS → MS traffic is not greater than the radio resources of the BS → MS interval 210. And transmits to the MS 330, if the 'BS → MS traffic' is greater than the radio resources of the 'BS → MS section' (210) to determine the radio resources of the 'BS → RS section' (220) ' It is checked whether there is an extra radio resource in BS → RS section '220 (S430).

If there is no excess radio resource in the 'BS → RS section' 220 as a result of checking in step S430, the BS 310 allocates the remaining 'BS → MS traffic' to the 'BS → MS section' 210. The frame is allocated to the 'BS → MS section' 210 of the next frame and transmitted to the MS 330 (S440). When there is an extra radio resource in the 'BS → RS section' 220, the 'BS → MS section' 220 Allocating the remaining 'BS → MS traffic' to the remaining radio resources of the 'BS → RS section' 220 after allocating the remaining 'BS → MS traffic' to the 210 'BS → RS section' 220 It transmits to the MS 330 through (S450).

In this case, the BS 310 specifies that the remaining 'BS → MS traffic' is allocated to the 'BS → RS interval' 220 in the map information broadcast through the 'BS → MS interval' 210.

As described above, when the BS 310 has 'BS → MS traffic' is greater than the radio resources of the 'BS → MS section' 210 and there is an extra radio resource in the 'BS → RS section' 220 By assigning the remaining 'BS → MS traffic' that cannot be transmitted through the 'BS → MS section' 210 to the extra radio resource in the 'BS → RS section' 220 and transmitting it to the MS 330, By preventing unnecessary waste of radio resources in the BS → RS period'220, it is possible to efficiently operate the radio resources of the MMR system.

5 is a conceptual diagram illustrating a downlink frame structure of an MMR system according to a preferred embodiment of the present invention.

The downlink frame of the MMR system according to the preferred embodiment of the present invention is similar to the downlink frame of the conventional MMR system described above with reference to FIG. In addition to BS-> RS traffic, 'BS-> MS traffic' may also be allocated.

That is, in the downlink frame of the conventional MMR system, as described above with reference to FIG. 2, even when there is an extra radio resource in the 'BS to RS interval' 220, other traffic cannot be allocated, so that radio resources are unnecessary. Although there was a problem of wasting, in the downlink frame of the MMR system according to the preferred embodiment of the present invention, 'BS → RS traffic' as well as 'BS → MS traffic' may be allocated to the 'BS → RS interval' 220. If there is an extra radio resource in the 'BS → RS section' 220, the remaining radio resources are allocated to the extra radio resource and transmitted, thereby efficiently using the radio resources through load balancing. have.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, the radio resources can be efficiently managed by preventing unnecessary waste of radio resources in the MMR system and efficiently distributing the load.

Claims (7)

Mobile including a base station (BS: Base Station, hereinafter referred to as 'BS'), a relay device (RS: Relay Station, hereinafter referred to as 'RS'), and a mobile terminal (MS: Mobile Station, referred to as 'MS') In a multi-hop relay (MMR: Mobile Multihop Relay) system, the BS allocates radio resources to traffic to be transmitted to the MS, (a) allocating 'BS → MS traffic' to a radio resource of 'BS → MS interval'; (b) checking whether the 'BS → MS traffic' is greater than a radio resource of the 'BS → MS interval'; (c) checking whether there is an extra radio resource in the BS to RS section when the BS to MS traffic is greater than the radio resource in the BS to MS section; And (d) if there is excess radio resources in the 'BS → RS section', allocating the remaining 'BS → MS section' to the 'BS → RS section' Radio resource allocation method in an MMR system, characterized in that it comprises a. The method of claim 1, wherein the method is After step (d) above, (e) If there is no extra radio resource in the 'BS → RS section', the remaining 'BS → MS section' is allocated to the 'BS → RS section' of the next frame. step The radio resource allocation method in the MMR system, characterized in that it further comprises. The method of claim 1, wherein the method is After step (d) above, (f) broadcasting by specifying that the remaining 'BS → MS traffic' is allocated to the 'BS → RS interval' in MAP (Mobile Application Protocol) information of the 'BS → MS interval'; The radio resource allocation method in the MMR system, characterized in that it further comprises. In a mobile multihop relay (MMR: Mobile Multihop Relay) system, 'Base station (BS: hereinafter referred to as' BS ') → mobile terminal (MS: Mobile Station, hereinafter referred to as' MS ') traffic is allocated to the radio resources of the' BS → MS interval ', and the' BS 'MS traffic' is larger than the radio resources of the 'BS → MS section' and there is an extra radio resource in the 'BS → Relay Station (RS') section. A BS for allocating the remaining 'BS → MS traffic' to the 'BS → RS interval' RS for receiving 'BS → RS traffic' allocated to the 'BS → RS interval' and relaying to 'RS → MS traffic' through the 'RS → MS interval'; And MS receiving 'BS → MS traffic' from the BS through the 'BS → MS interval' and receiving the remaining 'BS → MS traffic' from the BS through the 'BS → RS interval' Radio resource allocation system in the MMR system, characterized in that it comprises a. The method of claim 1, wherein the BS is, MMR, characterized in that the broadcasting is performed by designating that the remaining 'BS → MS traffic' is allocated to the 'BS → RS interval' in MAP (Mobile Application Protocol) information of the 'BS → MS interval'. Radio resource allocation system in the system. The method of claim 5, wherein the MS, In the MMR system, it is possible to check MAP (MAP: Mobile Application Protocol) information of the 'BS → MS section' and receive the remaining 'BS → MS traffic' from the BS through the 'BS → RS section'. Radio resource allocation system. Mobile Multihop Relay (MMR) including a relay device (RS: Relay Station, hereinafter referred to as 'RS') and a mobile terminal (MS: Mobile Station, hereinafter referred to as 'MS'). In an apparatus for allocating radio resources to traffic to be transmitted to the MS as a base station (BS: hereinafter referred to as "BS") of the system, Allocate 'BS → MS traffic' or remaining 'BS → MS traffic' to 'BS → MS section' and 'BS → RS section', and allocate the remaining 'BS → MS traffic' to 'BS → RS section' The traffic allocator for specifying that the remaining 'BS → MS traffic' is allocated to the 'BS → RS interval' in the map (MAP) information of the 'BS → MS interval'; And The usage status of the radio resource of the 'BS → MS section' and the radio resource of the 'BS → RS section' is determined so that the 'BS → MS traffic' is larger than the radio resource of the 'BS → MS section'. When there is an extra radio resource in the radio resource of BS → RS section, the traffic allocator allocates the BS → MS traffic in the BS → MS section and the rest in the BS → RS section. Resource management unit to control the allocation of 'BS → MS traffic' Radio resource allocation apparatus in the MMR system, characterized in that it comprises a.

Images