KR20090078885A - Apparatus and method for allocating resource to additional service flow in broadband wireless communication system - Google Patents

Abstract

An apparatus and a method for allocating resources about additional service flow in a broadband wireless communication system are provided to include request transmission amount information by defining a reservation field of a GMS message by a new field in the broadband wireless communication system and reduce wireless resource consumption when additional resources are assigned to a terminal having service flow. A terminal apparatus(210) in a broadband wireless communication system comprises a controller, a generator, and a transmitter. When the controller has at least one service flow, demand generation of additional uplink resources not included in at least one service flow is checked. The generator produces a message including a upward link resource request and request resource amount information. The transmitter sends a message.

Description

Resource allocation apparatus and method for additional service flow in broadband wireless communication system {APPARATUS AND METHOD FOR ALLOCATING RESOURCE TO ADDITIONAL SERVICE FLOW IN BROADBAND WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a broadband wireless communication system, and more particularly, to an apparatus and method for allocating resources for additional service flows in a broadband wireless communication system.

The 4th Generation (hereinafter referred to as '4G') communication system provides users with services of various quality of service (QoS) using a transmission rate of about 100 Mbps. There is active research going on. Particularly, in 4G communication systems, studies are being actively conducted to support high-speed services in a form of guaranteeing mobility and QoS in a broadband wireless access (BWA) communication system such as a wireless local area network system and a wireless urban area network system. Is going on. In addition, the representative communication system is the Institute of Electrical and Electronics Engineers (IEEE) 802.16 system.

The IEEE 802.16 system defines services of various QoS classes based on reliability of reliability and delay of information transmission between a base station and a terminal. Currently, the QoS class defined in the IEEE 802.16 system is shown in Table 1 below.

 QoS class  Characteristics BE No guarantee of transmission and delay nrtPS Guarantee for the transfer rtPS Guarantee against delay ertPS Guaranteed transmission and delay UGS Guaranteed transmission and delay

The QoS grade as shown in Table 1 is applied to each service flow, and the QoS grade to be applied when the service flow is generated is determined. A terminal may have a plurality of service flows simultaneously, and QoS grades of a plurality of service flows dependent on one terminal may be different. That is, even if the terminal has one service flow, the terminal may request and use resources other than the resources allocated to the service flow. For example, when the terminal has a service flow of UGS level, a procedure for requesting additional uplink resources is shown in FIG. 1.

Referring to FIG. 1, the terminal 110 having a service flow of a UGS level transmits a generic MAC subheader (GMS) message to the base station 120 (step 101). At this time, the configuration of the GSM message is shown in Table 2 below, the 'PM' field is set to 1.

 Syntax  Size (bit) Grant Management Subheader { -   if (scheduling service type == UGS) { -     SI One     PM One     FLI One     FL 4     Reserved 9   } else if (scheduling service type == Extended rtPS) { -     Extended piggyback request 11     FLI One     FL 4   } else { -     PiggyBack Request 16   } - } -

The 'PM' field indicates whether to request an uplink band, and the 'PM' field set to '1' means for an uplink band request.

Accordingly, when receiving the GMS message including the 'PM' field set to '1', the base station 120 transmits a CDMA Alloc IE (Code Division Multple Access Allocation Information Element) to the terminal 110 (step 103). ). In addition, the terminal 110 transmits a BR header (Bandwidth Request header) including desired resource amount information through an uplink resource allocated by the CDMA Alloc IE (step 105). The base station 120 receiving the BR header transmits an UL Alloc IE (UpLink Allocation IE) including uplink resource allocation information to the terminal 110 (step 107), and the terminal 110 transmits the UL. The uplink data is transmitted through the uplink resource allocated by the Alloc IE (step 109).

As described above, even if the terminal already has a service flow, the terminal and the base station should exchange about four messages in order to be allocated additional resources. As a result, there is a problem in that a lot of radio resources consumption and time delay occurs.

Accordingly, an object of the present invention is to provide an apparatus and method for reducing radio resource consumption and time delay in allocating additional resources to a terminal having a service flow in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for simultaneously transmitting a required resource amount when a terminal having a service flow requests a separate uplink resource in a broadband wireless communication system.

According to a first aspect of the present invention for achieving the above object, in a broadband wireless communication system, the terminal device, with at least one service flow, of a separate uplink resource not included in the at least one service flow And a controller for generating a request, a generator for generating a message including an uplink resource request and required resource amount information, and a transmitter for transmitting the message.

According to a second aspect of the present invention for achieving the above object, in a broadband wireless communication system, a base station apparatus, from a terminal having at least one service flow, a separate uplink resource request not included in the at least one service flow A receiver for receiving a message for receiving the message, an interpreter for confirming that the message is a message for a separate uplink resource request, and checking the required resource amount information included in the message, and an uplink to the terminal according to the requested resource amount information And a scheduler for allocating resources.

According to a third aspect of the present invention for achieving the above object, a method of operating a terminal in a broadband wireless communication system, in the state having at least one service flow, a separate uplink not included in the at least one service flow The method includes identifying a demand occurrence of a resource, generating a message including uplink resource request and required resource amount information, and transmitting the message.

According to a fourth aspect of the present invention for achieving the above object, a method of operating a base station in a broadband wireless communication system, a separate uplink resource not included in the at least one service flow from a terminal having at least one service flow Receiving a message for the request, confirming that the message is a message for a separate uplink resource request, confirming the required resource amount information included in the message, and upstream to the terminal according to the requested resource amount information And allocating a link resource.

In a broadband wireless communication system, a reservation field of a generic MAC subheader (GMS) message is defined as a new field to include required transmission information, thereby reducing radio resource consumption and time delay when allocating additional resources to a terminal having a service flow.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, a description will be given of a technique for reducing radio resource consumption and time delay when allocating additional resources to a terminal having a service flow in a broadband wireless communication system. Hereinafter, the present invention will be described using an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system as an example, and may be equally applicable to other wireless communication systems.

2 illustrates an example of signal exchange when an additional uplink resource request of a terminal having a service flow is performed in a broadband wireless communication system according to the present invention.

Referring to FIG. 2, the terminal 210 having at least one service flow recognizes that a demand for a separate uplink resource occurs and transmits a GMS message to the base station 220 (step 201). At this time, the configuration of the GMS message is shown in Table 3 below, and includes information on the request amount of uplink resources.

 Syntax  Size (bit) Grant Management Subheader { -   if (scheduling service type == UGS) { -     SI One     PM One     FLI One     FL 4     Extended piggyback request II 9   } else if (scheduling service type == Extended rtPS) { -     Extended piggyback request 11     FLI One     FL 4   } else { -     PiggyBack Request 16   } - } -

Meaning of each field shown in Table 3 is as shown in Table 4 below.

 Field name  Length (bit)  Description Frame Lantency Indication (FLI) One 0: FL field disabled for this grant 1: FL field enabled for this grant FL (Frame Latency) 4 The number of frames previous to the current one in which the transmitted data was available. When the latency is greater than 15 then the FL shall be set to 15.  Extended Piggyback Request 11 The number of bytes of UL bandwidth requested by the MS. The BR is for the CID. The request shall not include any PHY overhead. In case of Extended rtPS, the BS changes its grant size to the size specified in this field. PBR (PiggyBack Request) 16 The number of bytes of UL bandwidth requested by the SS. The BR is for the CID. The request shall not include any PHY overhead. The request shall be incremental. PM (Poll Me) One 0: No action 1: Used by the SS to request a bandwidth poll      Extended Piggyback Request II 9 The number of byte of UL bandwidth requested by the MS. The BR is for the CID. The request shall not include any PHY overhead. 0: 8 bytes 1: 16 bytes 2: 32 bytes 3: 64 bytes 4: 128 bytes 5: 256 bytes 6: 512 bytes 7: 1024 bytes 8: 2048 bytes SI (Slip Indicator) One 0: No action 1: Used by the SS to indicated a slip of UL grants relative to the UL queue depth

That is, the terminal 210 transmits a GMS message in which the 'PM' field is' 1 'and the Extened Piggyback Request II' field is set to a desired resource amount.

After receiving the GMS message, the base station 220 confirms the amount of resources desired by the terminal 210 through the GMS message, allocates uplink resources to the terminal 210 within available resources, and then uplink resources. A UL Alloc IE (UpLink Allocation Information Element) including allocation information is transmitted to the terminal 210 (step 203).

After receiving the UL Alloc IE, the terminal 210 confirms an uplink resource allocated to itself through the UL Alloc IE and then transmits uplink data through the allocated resource (step 205).

3 is a block diagram of a terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the terminal includes a control unit 302, a message generator 304, a data buffer 306, a message interpreter 308, an encoder 310, a symbol modulator 312, and a subcarrier mapper ( 314, an orthogonal frequency division multiplexing (OFDM) modulator 316, a radio frequency (RF) transmitter 318, an RF receiver 320, an OFDM demodulator 322, a subcarrier demapper 324, a symbol demodulator 326 And a decoder 328.

The controller 302 controls the overall function of the MAC layer of the terminal. For example, the controller 302 performs a function of transferring data transmitted and received through an activated service flow to an upper layer. In addition, the controller 302 checks whether a demand for radio resources occurs in response to a request of an application program or interworking with a higher layer. In particular, when a demand for a separate uplink radio resource occurs in a situation having a service flow, the controller 302 controls the message generator 304 to generate a message for requesting resource allocation to be transmitted to a base station. At this time, the control unit 302 calculates the required amount of resources, and provides the resource amount information to the message generator (304).

The message generator 304 generates a MAC management message to be sent. The MAC management message is for performing a MAC layer procedure and has a format dependent on a communication standard. For example, when it is desired to request an additional additional uplink resource in a state having at least one service flow, the message generator 304 generates a GMS message of a type as shown in Table 3 below. In this case, the at least one service flow includes an uplink grant scheduling (UGS) type service flow. In this case, the 'PM' field of the GMS message is set to '1' and the Extened Piggyback Request II 'field is set to a desired resource amount.

The data buffer 306 temporarily stores data transmitted and received, and outputs the stored data under the control of the controller 302. The message interpreter 308 interprets the received MAC management message. The MAC management message is for performing a MAC layer procedure and has a format dependent on a communication standard. For example, when a map (MAP) message is received, the message interpreter 308 interprets IEs (eg, uplink allocation IE) included in the map message, thereby locating radio resources allocated to the terminal itself. Check.

The encoder 310 channel-codes the information bit string provided from the message generator 304 and the data buffer 306. The symbol modulator 312 demodulates the channel-coded bit stream and converts the complex code into complex symbols. The subcarrier mapper 314 maps the complex symbols to the frequency domain assigned thereto. The OFDM modulator 316 converts complex symbols mapped to the frequency domain into a time domain signal through an inverse fast fourier transform (IFFT) operation, and constructs an OFDM symbol by inserting a cyclic prefix (CP). The RF transmitter 318 up-converts the baseband signal into an RF band signal and transmits it through an antenna.

The RF receiver 320 down-converts an RF band signal received through an antenna to a baseband signal. The OFDM demodulator 322 divides the signal provided from the RF receiver 320 in OFDM symbol units, removes a CP, and restores complex symbols mapped to a frequency domain through a fast fourier transform (FFT) operation. . The subcarrier demapper 324 extracts a signal mapped to a resource allocated to the terminal itself from among complex symbols mapped to a frequency domain. The symbol demodulator 326 demodulates the complex symbols into a bit string. The decoder 328 restores the information bit stream by channel decoding the bit stream.

4 is a block diagram of a base station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the base station includes an RF receiver 402, an OFDM demodulator 404, a subcarrier demapper 406, a symbol demodulator 408, a decoder 410, an encoder 412, a symbol modulator. 414, the subcarrier mapper 416, the OFDM modulator 418, the RF transmitter 420, the message interpreter 422, the data buffer 424, the message generator 426, and the scheduler 428. .

The RF receiver 402 down-converts an RF band signal received through an antenna to a baseband signal. The OFDM demodulator 404 divides the signal provided from the RF receiver 402 in OFDM symbol units, removes a CP, and restores complex symbols mapped to a frequency domain through an FFT operation. The subcarrier dimapper 406 extracts and classifies complex symbols mapped to a frequency domain into processing units. The symbol demodulator 408 demodulates the complex symbols into a bit string. The decoder 410 restores the information bit stream by channel decoding the bit stream.

The encoder 412 channel-codes the information bit string provided from the message generator 426 and the data buffer 424. The symbol modulator 414 demodulates the channel-coded bit string and converts the result into complex symbols. The subcarrier mapper 416 maps the complex symbols to the frequency domain according to the resource allocation result of the scheduler 428. The OFDM modulator 418 converts the complex symbols mapped to the frequency domain into a time domain signal through an IFFT operation, and constructs an OFDM symbol by inserting a CP. The RF transmitter 420 up-converts the baseband signal into an RF band signal and transmits it through an antenna.

The message interpreter 422 interprets the received MAC management message. The MAC management message is for performing a MAC layer procedure and has a format dependent on a communication standard. For example, when a GMS message is received from a terminal having at least one service flow, the message interpreter 422 checks the value of each field according to the format as shown in Table 3 above. In this case, the at least one service flow includes a UGS type service flow. In particular, the message interpreter 422 confirms that the GMS message is a message for uplink resource request by confirming that the 'PM' field is set to '1', and checks the value of the 'Extended piggyback reqeust II' field. By checking the required resource amount. That is, when the 'PM' field of the GMS message is set to '1', the message analyzer 422 checks the required resource amount of the terminal by checking the value of the 'Extended Piggyback Request II' field.

The data buffer 424 temporarily stores the data transmitted and received, and outputs the stored data according to the scheduling result of the scheduler 428. The message generator 426 generates a MAC management message to be transmitted. The MAC management message is for performing a MAC layer procedure and has a format dependent on a communication standard. For example, the message generator 426 generates a map message for notifying the radio resource allocation result. Here, the map message is composed of a plurality of IEs such as a downlink allocation IE and an uplink allocation IE. In this case, the message generator 426 receives the radio resource allocation result from the scheduler 428.

The scheduler 428 allocates radio resources to the terminals. In other words, the scheduler 428 allocates radio resources to the terminals with reference to the characteristics of the service flows, the request of the terminal, the channel state, and the like. For example, when a GMS message having a format as shown in Table 3 for an uplink resource allocation request is received from a terminal having at least one service flow, the scheduler 428 is provided from the message interpreter 422. The radio resource is allocated to the terminal that has transmitted the GMS message with reference to the required resource amount information. The scheduler 428 provides radio resource allocation result information to the message generator 426 in order to deliver a radio resource allocation result to the terminal.

5 is a flowchart illustrating an operation procedure of a terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, in step 501, the terminal determines whether a demand for a separate uplink resource occurs during service flow holding. In other words, the terminal checks whether a demand for a separate uplink resource other than the at least one service flow occurs while having at least one service flow. In this case, the at least one service flow includes a UGS type service flow.

When the demand for the separate uplink resource occurs, the terminal proceeds to step 503 and generates and transmits a GMS message including the required resource amount information. The GMS message has a format as shown in Table 3. The PM field is set to '1' and the Extened Piggyback Request II field is set to a desired resource amount.

In step 505, the terminal determines whether uplink resource allocation information, that is, uplink allocation IE is received.

When the uplink resource allocation information is received, the terminal proceeds to step 507 to identify the location of the allocated resource and transmits uplink data through the allocated resource.

6 is a flowchart illustrating an operation procedure of a base station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 6, in step 601, the base station determines whether a GMS message for uplink resource request is received from a terminal having at least one service flow. That is, the base station has a format as shown in Table 3 and checks whether a GMS message having a 'PM' field of '1' is received. In this case, the at least one service flow includes a UGS type service flow.

When the GMS message for the uplink resource request is received, the base station determines the required resource amount information included in the GMS message in step 603. That is, the base station checks the value of the 'Extended Piggyback Request II' field in the GMS message having the format as shown in Table 3.

After checking the required resource amount information, the base station proceeds to step 605 and allocates a radio resource to a terminal that has transmitted the GMS message with reference to the required resource amount information.

In step 607, the base station generates and transmits uplink resource allocation information, that is, uplink allocation IE, for notifying the resource allocation result determined in step 605.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present 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 diagram illustrating an example of signal exchange when an additional uplink resource request of a terminal having a service flow in a broadband wireless communication system according to the prior art;

2 is a diagram illustrating an example of signal exchange when an additional uplink resource request of a terminal having a service flow is performed in a broadband wireless communication system according to the present invention;

3 is a block diagram of a terminal in a broadband wireless communication system according to an embodiment of the present invention;

4 is a block diagram of a base station in a broadband wireless communication system according to an embodiment of the present invention;

5 is a view illustrating an operation procedure of a terminal in a broadband wireless communication system according to an embodiment of the present invention;

6 is a diagram illustrating an operation procedure of a base station in a broadband wireless communication system according to an embodiment of the present invention.

Claims (20)

A terminal device in a broadband wireless communication system, A controller for identifying a demand occurrence of a separate uplink resource not included in the at least one service flow in a state having at least one service flow; A generator for generating a message including uplink resource request and required resource amount information; And a transmitter for transmitting said message. The method of claim 1, The at least one service flow comprises an uplink grant scheduling (UGS) type service flow. The method of claim 1, The message is a device, characterized in that the GMS (Genaric MAC Subheader) message. The method of claim 3, wherein The message is characterized in that the device is configured as shown in the following table,  Syntax  Size (bit) Grant Management Subheader { -   if (scheduling service type == UGS) { -     SI One     PM One     FLI One     FL 4     Extended piggyback request II 9   } else if (scheduling service type == Extended rtPS) { -     Extended piggyback request 11     FLI One     FL 4   } else { -     PiggyBack Request 16   } - } - The method of claim 4, wherein The generator, characterized in that for generating a GMS message with the 'PM' field is set to 1, the 'Extended piggyback reqeust II' field is set to the required amount of resources. A base station apparatus in a broadband wireless communication system, A receiver for receiving a message for a separate uplink resource request not included in the at least one service flow from a terminal having at least one service flow; An interpreter for confirming that the message is a message for requesting a separate uplink resource, and confirming the required resource amount information included in the message; And a scheduler for allocating an uplink resource to the terminal according to the requested resource amount information. The method of claim 6, The at least one service flow comprises an uplink grant scheduling (UGS) type service flow. The method of claim 6, The message is a device, characterized in that the GMS (Genaric MAC Subheader) message. The method of claim 8, The message is characterized in that the device is configured as shown in the following table,  Syntax  Size (bit) Grant Management Subheader { -   if (scheduling service type == UGS) { -     SI One     PM One     FLI One     FL 4     Extended piggyback request II 9   } else if (scheduling service type == Extended rtPS) { -     Extended piggyback request 11     FLI One     FL 4   } else { -     PiggyBack Request 16   } - } - The method of claim 9, The interpreter confirms that the GMS message is a message for an uplink resource request by confirming that the 'PM' field is set to 1, and confirms the required resource amount by checking a value of the 'Extended piggyback reqeust II' field. Characterized in that the device. In the method of operating a terminal in a broadband wireless communication system, Identifying a demand occurrence of a separate uplink resource not included in the at least one service flow in a state having at least one service flow; Generating a message including uplink resource request and required resource information; Transmitting the message. The method of claim 11, The at least one service flow comprises an Uplink Grant Scheduling (UGS) type service flow. The method of claim 11, The message, characterized in that the GMS (Genaric MAC Subheader) message. The method of claim 13, The message is characterized in that, as shown in the following table,  Syntax  Size (bit) Grant Management Subheader { -   if (scheduling service type == UGS) { -     SI One     PM One     FLI One     FL 4     Extended piggyback request II 9   } else if (scheduling service type == Extended rtPS) { -     Extended piggyback request 11     FLI One     FL 4   } else { -     PiggyBack Request 16   } - } - The method of claim 14, The process of generating the message, Generating a GMS message in which the 'PM' field is 1 and the 'Extended piggyback reqeust II' field is set to a required resource amount. A method of operating a base station in a broadband wireless communication system, Receiving a message for a separate uplink resource request not included in the at least one service flow from a terminal having at least one service flow; Confirming that the message is a request for a separate uplink resource request, and checking the required resource amount information included in the message; And allocating an uplink resource to the terminal according to the required resource amount information. The method of claim 16, The at least one service flow comprises an Uplink Grant Scheduling (UGS) type service flow. The method of claim 16, The message, characterized in that the GMS (Genaric MAC Subheader) message. The method of claim 18, The message is characterized in that, as shown in the following table,  Syntax  Size (bit) Grant Management Subheader { -   if (scheduling service type == UGS) { -     SI One     PM One     FLI One     FL 4     Extended piggyback request II 9   } else if (scheduling service type == Extended rtPS) { -     Extended piggyback request 11     FLI One     FL 4   } else { -     PiggyBack Request 16   } - } - The method of claim 19, Confirming that the message is a message for requesting a separate uplink resource, and checking the required resource amount information included in the message, Confirming that the GMS message is a message for an uplink resource request by confirming that the 'PM' field is set to 1, and checking a required resource amount by checking a value of the 'Extended piggyback reqeust II' field. How to feature.

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