KR20140077756A - Method for allocating wireless channel in tdd communication system - Google Patents

Abstract

Disclosed is a method for allocating a wireless channel in a time division duplex (TDD) communication system. A method for dynamically allocating a wireless channel by a base station in a TDD communication system includes allowing the base station to receive a call from a terminal, to determine a type of service of the received call; and to allocate a wireless channel according to the type of service corresponding to the determination. The type of service is at least one of a symmetrical service in which service qualities of a forward direction link and a reverse direction link are symmetrical to each other, and an asymmetrical service in which the service qualities are asymmetrical to each other. The symmetrical service can be effectively allocated in the TTD communication which is effective for asymmetrical service.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of assigning a wireless channel to a TDD communication system,

The present invention relates to a radio channel allocation method in a TDD communication system, and more particularly, to a radio channel allocation method in a TDD communication system according to a service type.

Future wireless / mobile communication system should be able to provide multimedia type ultra wideband / intelligent service along with development of smartphone, and it is expected that asymmetric communication which is a packet communication with internet development becomes more and more popular. In multimedia packet communication, data transmission amount of the reverse link and data transmission amount of the forward link are generally asymmetric. In particular, services such as Video on Demand (VOD) and video viewing have almost no data transmission amount in the reverse link, and the data transmission amount of the forward link is mostly occupied.

Accordingly. The FDD (Frequency Division Duplex) scheme in which the radio resources of the reverse link and the forward link are fixed in both directions is difficult to efficiently support the asymmetric service. Therefore, a TDD (Time Division Duplex) scheme in which radio resources are shared in both directions rather than the FDD scheme and time is divided and used for reverse link and forward link is more efficient.

However, symmetric communication services that require symmetric and strict quality of service in both directions, such as voice / video communication, without considering symmetric services and asymmetric services, and services with asymmetric communication services in TDD, There is a drawback to drop.

It is an object of the present invention to overcome the disadvantages described above to provide a radio channel assignment method in a TDD communication system that can effectively provide a symmetric service requiring a service quality in a TDD communication system suitable for an asymmetric service.

According to another aspect of the present invention, there is provided a method for allocating a radio channel dynamically in a TDD communication system in a TDD communication system, the method comprising the steps of: And determining a service type of the received call and assigning a radio channel according to the service type according to the determination, wherein the service type is a symmetric service in which the service quality of the forward link and the reverse link is symmetric, Asymmetric type service.

According to the radio channel allocation method in the TDD communication system as described above, it is possible to efficiently provide symmetric services in the TDD scheme effective for asymmetric services, thereby increasing the efficiency of radio resources.

1 is a block diagram of a communication system environment of a radio channel allocation method in a TDD communication system according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a procedure for allocating a radio channel by a base station in a radio channel allocation method in a TDD communication system according to an embodiment of the present invention.
3 is an exemplary diagram illustrating a channel allocation structure of a radio channel allocation method in a TDD communication system according to an embodiment of the present invention.
4 is a view illustrating another example of a channel allocation structure of a radio channel allocation method in a TDD communication system according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 is a block diagram of a communication system environment of a radio channel allocation method in a TDD communication system according to an embodiment of the present invention.

Referring to FIG. 1, a TDD communication system may be represented by a base station 100, a terminal 300, and a wireless channel 200.

The base station 100 manages and allocates resources of the radio channel 200 in the TDD communication system.

In the present invention, the base station 100 may classify the communication service requested by the terminal 300 into a symmetric service and an asymmetric service, and allocate the symmetric service channel and the asymmetric service channel corresponding to the classification.

Here, the symmetric type service includes a forward link transmitted from the base station 100 to the terminal 300 and a reverse link transmitted from the terminal 300 to the base station 100, for example, , Bit error rate, and so on.

For example, a communication service such as a voice call or a video call must satisfy the same quality of service of a forward link and a reverse link, so that a normal communication service is possible.

Therefore, it is a communication service in which the same radio resources should be allocated to the forward link and the reverse link when the radio channel 200 is allocated.

Also, symmetric services are characterized by requiring a certain amount of radio resources depending on the type of symmetric service.

For example, a voice call service is required to maintain a constant amount of data transmission.

Here, the asymmetric service means a communication service requiring different quality of service for a forward link transmitted from the base station 100 to the terminal 300 and a reverse link transmitted from the terminal 300 to the base station 100.

For example, most packet communication services, such as video on demand (VOD), UCC services, file download or file upload services, and web surfing services, take the form of asymmetric services.

Therefore, when allocating the radio channel 200, it is a communication service that allocates asymmetric radio resources to the forward link and the reverse link according to the respective link requests.

Also, the asymmetric service is characterized in that the required amount of radio resources is changed without changing, and the communication service can be performed even when the allocated radio resources are changed.

For example, in a file download or video-on-demand service, not only is the demanded radio resources of the forward link and the reverse link asymmetric, but also the demanded radio resources of the forward link and the reverse link are changed in the service.

The terminal 300 may include information for determining the type of the communication service requested when the base station 100 requests the allocation of the wireless channel 200 for the communication service.

Information that can determine whether the type of communication service is a symmetric service or an asymmetric service may explicitly have the form of a symmetric service request or an asymmetric service request.

Also, the terminal 300 may be configured with service quality information that requests a symmetric service or an asymmetric service to be determined even if the request is not an explicit service type request.

The radio channel 200 of the TDD communication system is used by dividing the bandwidth of the radio resources serviced by the base station 100 by time, on the forward link and the reverse link.

The FDD communication system is ineffective in supporting the asymmetric service by using the bandwidth of the radio resources serviced by the base station by dividing the bandwidth into the frequency bands and using the forward link and the reverse link. However, the TDD communication system uses the bandwidth of the radio resource as the forward link and the reverse link So it is effective for asymmetric services.

FIG. 2 is a flowchart illustrating a procedure for allocating a radio channel by a base station in a radio channel allocation method in a TDD communication system according to an embodiment of the present invention.

In the TDD communication system, the base station 100 receives a call requesting allocation of a wireless channel 200 in order for the terminal 300 to receive a communication service (S100).

The call requesting the assignment of the wireless channel 200 by the terminal 300 to the base station 100 may include information for confirming the type of the communication service to be provided by the terminal 300.

The base station 100 determines whether a call request for allocation of a wireless channel 200 for the communication service received from the terminal 300 is accepted (S110).

The call admission decision is based on whether or not the available radio channel 200 exists in the TDD communication system, a call format requesting the allocation of the radio channel 200, authentication of the terminal 300 requesting the allocation of the radio channel 200, It can be judged.

Also, when determining the available radio channel 200 of the TDD communication system, it is possible to determine based on the data format of the communication service.

If it is determined in step S110 that the call is not accepted, the base station 100 performs call rejection to the terminal 300 and terminates the wireless channel 200 allocation procedure in step S120.

The base station 100 transmits the reason for the call rejection to the UE in the call rejection procedure, and allows the UE to refer to the next call request.

Also, the base station 100 may cause the terminal to perform additional operations corresponding to the call rejection together with the reason for the call rejection in the call rejection procedure.

If it is determined in step S110 that the call is accepted, the base station 100 determines whether the communication service requested by the terminal 300 is a symmetric service (S130).

A method for determining a type of a communication service, the method comprising the steps of: determining whether a communication service is to be performed by using a method in which a terminal (300) specifies a symmetric communication service or an asymmetric communication service when a call is requested, of Service (QoS) requirements, and classifying them into symmetric or asymmetric communication services.

If it is determined in step S130 that the type of the communication service requested by the terminal 300 is a symmetric service, the base station 100 allocates the symmetric service channel and ends the wireless channel 200 allocation procedure in step S140.

The base station 100 allocates a symmetric service channel to both ends of a usable radio channel 200 area with a reverse link channel area and a forward link channel area with the same size in a usable radio channel 200 area.

If it is determined in step S130 that the communication service requested by the MS 300 is an asymmetric service, the BS 100 allocates the asymmetric service channel and terminates the wireless channel 200 allocation procedure ).

The base station 100 assigns the asymmetric service channel asymmetrically required in the available radio channel 200 area and the requested forward link channel area to the center of the usable radio channel 200 area .

3 is an exemplary diagram illustrating a channel allocation structure of a radio channel allocation method in a TDD communication system according to an embodiment of the present invention.

Referring to FIG. 3, when a base station receives a request for a symmetric service from a first terminal, the base station can allocate channels on both ends of the available service channel to the symmetric service channel 201 of the first terminal. The forward link channel 201a and the reverse link channel 201b of the first terminal are allocated time slots of the same size.

When the base station receives another symmetric service request from the second terminal, the base station can allocate the channels on both ends of the available service channel to the symmetric service channel 202 of the second terminal. The forward link channel 202a and the reverse link channel 202b of the second terminal are also assigned time slots of the same size.

Here, the sizes of the symmetric service channel of the first terminal and the symmetric service channel of the second terminal may be different.

When the base station receives an asymmetric service request from the third terminal, the base station can allocate the asymmetric service channel 203 of the third terminal to the central channel in the available service channel. The forward link channel 203a and the reverse link channel 203b of the third terminal are allocated time slots of different sizes according to the required quality of service.

When the asymmetric service is requested from the fourth terminal, the base station can allocate the asymmetric service channel 204 of the fourth terminal to the central channel in the available service channel. The forward link channel 204a and the reverse link channel 204b of the fourth terminal are allocated time slots of different sizes according to the required quality of service.

As described above, when a symmetric service channel and an asymmetric service channel are allocated at the same time, usable channel regions 205 and 206 are formed at the center of both ends. Therefore, channel allocation of various sizes can be flexibly performed.

4 is a view illustrating another example of a channel allocation structure of a radio channel allocation method in a TDD communication system according to an embodiment of the present invention.

When the symmetric service of the first terminal is terminated after the wireless channel is allocated as shown in FIG. 3, the areas 201a and 201b allocated to the symmetric service of the first terminal in the symmetric service channel become usable.

At this time, if the base station receives the symmetric service request from the fifth terminal, the base station determines whether the symmetric service channel 205 of the fifth terminal can be allocated to the areas 201a and 201b allocated to the symmetric service of the first terminal To the areas 201a and 201b allocated to the symmetric service of the first terminal if possible and allocate the symmetric service channel 207 of the fifth terminal to both ends of the usable channel area if not possible . Here, the forward link channel 207a and the reverse link channel 207b of the second terminal are also assigned time slots of the same size.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

100: base station
200: Wireless channel
201a, 202a, 207a: symmetric service forward link channel
201b, 202b, 207b: symmetric service reverse link channel
203a, 204a: forward link channel for asymmetric service
203b, 204b: Asymmetric service reverse link channel
205, 206: usable channel area
300:

Claims (1)

A method for dynamically allocating a wireless channel in a TDD communication system,
The base station accepting the call from the terminal;
Determining a service type of the received call; And
And allocating a radio channel according to a service type according to the determination, wherein the service type is at least one of a symmetric service whose service quality of the forward link and the reverse link is symmetric or an asymmetric service whose asymmetric service quality is the service quality Wherein the radio channel assignment method is a TDD communication system.

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