KR20100028466A - Method of performing bandwidth request process - Google Patents

Abstract

PURPOSE: A method of performing bandwidth request process is provided to improve QoS(Quality of Service) by setting a resource allocation waiting time according to a QoS level. CONSTITUTION: A BS(Base Station) broadcasts a resource allocation waiting time according to a grand scheduling type through a SFH(Super Frame Header)(S310). An MS(Mobile Station) transmits a first bandwidth request indicator(S320). The terminal establishes timer as 40ms. The terminal transmits a second bandwidth indicator of requesting(S330). The terminal establishes timer as 40ms. If the terminal receives the upward link resource within 40ms from the base station, the terminal transmits data(S340, S350).

Description

How to perform bandwidth request process in wireless communication system {METHOD OF PERFORMING BANDWIDTH REQUEST PROCESS}

The present invention relates to a wireless communication system, and more particularly, to a method for performing a bandwidth request process in a wireless communication system.

1 is a diagram illustrating a resource allocation process of a conventional wireless communication system. As shown in FIG. 1, in the conventional wireless communication system, when there is no allocated resource, the terminal requests an uplink bandwidth in a random access method. The terminal transmits a bandwidth request code (BR code) to the base station (S110). The base station, which has normally received the code transmitted by the terminal, allocates an uplink resource for transmitting a bandwidth request (hereinafter referred to as "BW-REQ") message to the terminal (S120). After the UE transmits the bandwidth request code, the UE sets a timer to a predetermined waiting time in the wireless communication system, and if the UE does not receive an uplink resource for transmitting the BW-REQ message until the waiting time expires, the UE requests the bandwidth request code. Resend. Here, a time for waiting until the terminal transmits the bandwidth request code after retransmitting the bandwidth request code after receiving the uplink resource is called a resource allocation wait time. In this case, the timer may be a contention-based reservation timeout.

The terminal transmits a BW-REQ message to the base station through the allocated uplink resources (S130). When the base station receives the BW-REQ message, the base station allocates an uplink resource for transmitting data to the terminal (S140). The terminal transmits data through the allocated resources (S150). Therefore, the resource allocation process of the conventional wireless communication system consists of five steps.

As described above, the prior art applies the same resource allocation wait time for all terminals and applies the same resource allocation wait time for all data transmitted by one terminal, thereby waiting for an appropriate resource allocation according to the quality of service (QoS). There is a problem that the time is not set.

An object of the present invention is to provide a bandwidth request transmission method using an appropriate resource allocation wait time according to QoS.

Another object of the present invention is to provide a bandwidth request transmission method using a resource allocation wait time in consideration of the priority of a terminal.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In order to achieve the above object, in the wireless communication system according to an aspect of the present invention, a method for performing a bandwidth request process through a random access, the terminal is a first request for resource allocation for data transmission The bandwidth request is transmitted to the base station, and if there is no response from the base station during the variably determined resource allocation wait time, the second bandwidth request is transmitted to the base station.

In this case, the resource allocation wait time may be determined according to the QoS level of the data, or may be determined according to the priority of the terminal.

In addition, the resource allocation wait time may be a resource allocation wait time corresponding to the QoS level of the data in the resource allocation wait time for each QoS level received from the base station through a broadcast message or a MAC message.

In addition, the terminal receives the resource allocation wait time for each index from the base station through a broadcast message, and transmits a MAC message including information on the QoS level of the data to the base station to the resource allocation wait time for each index; An index of the resource allocation wait time determined in consideration of the QoS level may be received from the base station, and the resource allocation wait time corresponding to the received index may be used as the resource allocation wait time.

In addition, the terminal transmits a MAC message including information on the QoS level of the data to the base station to receive the MAC message including the first resource allocation wait time determined in consideration of the QoS level from the base station. Can be.

According to embodiments of the present invention has the following effects.

First, QoS can be improved by setting a resource allocation wait time differently according to the QoS level.

Second, by differently setting the resource allocation wait time according to the priority of the terminal, it is possible to provide a differentiated service according to the terminal priority.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

First, a resource allocation process of the wireless communication system according to an embodiment of the present invention will be described with reference to FIG. 2.

2 is a diagram illustrating a resource allocation process of a wireless communication system according to an embodiment of the present invention.

In a wireless communication system according to an embodiment of the present invention, a base station supports both a 5-step scheme and a 3-step scheme, which is a fast approach. The three-step method is a method of performing S210, S240, and S250 in FIG. 2, and the five-step method is a method of performing all of S210 to S250. The 5-step scheme may be used independently of the 3-step scheme, or may be used as an alternative to the 3-step scheme.

As shown in FIG. 2, in step 3, the terminal transmits a bandwidth request indicator to the base station (S210).

The terminal transmits a bandwidth request to the base station to request resource allocation for data transmission. The bandwidth request is an indicator or branch office that is the first information that the terminal transmits to request the resource allocation from the base station. And may be transmitted via a quick access message. The bandwidth request includes information on required uplink resources, and may include a mobile station identification (MS ID), bandwidth request size, and QoS level.

The QoS level refers to the QoS level required by the terminal, and may be replaced with the term QoS index or QoS ID. However, the present invention is not limited thereto. The QoS level may be determined according to various QoS parameters such as grant scheduling type or latency.

In an embodiment of the present invention, a case where a bandwidth request is transmitted through a bandwidth request indicator is described as an example, but is not limited thereto. A case where a terminal transmits a code, a random access preamble, a message, etc. to request a bandwidth to a base station is described. It includes everything.

The base station receiving the bandwidth request indicator from the terminal allocates uplink resources to the terminal (S240), the terminal transmits data through the allocated resources (S250). In this case, the terminal may transmit additional uplink bandwidth request information.

If the terminal transmits the bandwidth request indicator to the base station in step 5 (S210). The base station allocates an uplink resource for transmitting a bandwidth request message (BW-REQ message) to the terminal (S220). When the terminal transmits the bandwidth request message through the allocated resources (S230), the base station allocates uplink resources to the terminal (S240), and the terminal transmits data through the allocated resources (S250). In this case, the terminal may transmit additional uplink bandwidth request information.

In an embodiment of the present invention, when the terminal transmits the bandwidth request indicator or the bandwidth request message, the terminal may also transmit the QoS level of the data to be transmitted together with the terminal identifier and the bandwidth request size. The base station may give priority to the bandwidth request of the terminals by using the QoS level, and may know the resource allocation wait time to be used by the terminal.

In another embodiment of the present invention, when the terminal transmits the bandwidth request indicator or the bandwidth request message, the terminal may transmit an index of resource allocation wait time to be used together with the terminal identifier and the bandwidth request size.

In another embodiment of the present invention, when the terminal transmits the bandwidth request indicator or the bandwidth request message, the terminal may transmit a flow ID together with the terminal identifier and the bandwidth request size. Then, the base station can estimate the QoS level of the data to be transmitted by the terminal or the index of resource allocation waiting time to be used by the terminal by the flow identifier.

In addition, the base station allocates resources to be used by the terminal or the QoS level of data to be transmitted by the terminal through the information on the time point at which the bandwidth request indicator or bandwidth request message is transmitted, the resource request area for transmitting the bandwidth request indicator or bandwidth request message, or the bandwidth request code. The index of latency can be estimated.

In addition, if the base station includes QoS information that is transmitted through a quick access message or a bandwidth request message (BW-REQ message) included with the bandwidth request indicator, the terminal intends to transmit data through this information. It is possible to estimate the QoS level or the index of the resource allocation wait time to be used by the terminal. For example, if the bandwidth request size contains not only information about the size but also the characteristics of the request (signaling data, service type, urgency for the request), this information can be used to estimate the index of resource allocation latency. Can be.

When the terminal requests resources for a plurality of connections through one bandwidth request indicator or one bandwidth request message to the base station, the terminal is the QoS level of the connection having the highest QoS level of data to be transmitted among the plurality of connections. The index of the resource allocation latency of the connection having the smallest resource allocation latency to be transmitted or used may be transmitted.

When the terminal does not transmit a value for estimating the QoS level, the index of the resource allocation wait time or the index of the QoS level or the resource allocation wait time, the base station and the terminal is called a superframe header (hereinafter referred to as "SFH"). ), The predetermined timer value may be applied by a message-based explicit method or a message-based implicit method.

Next, a method for transmitting a bandwidth request in a wireless communication system according to an embodiment of the present invention will be described with reference to FIGS. 3 to 13.

According to an embodiment of the present invention, the terminal transmits a bandwidth request to the base station to request resource allocation for data transmission, and waits for a resource allocation waiting time determined according to the QoS level of the data to be transmitted.

3 is a diagram illustrating a bandwidth request transmission method of a wireless communication system according to a first embodiment of the present invention in a three-stage manner. In the first embodiment of the present invention, the base station transmits a resource allocation wait time for each QoS to the terminal through a broadcast message. In the first embodiment of the present invention, a case in which resource allocation wait time is set in consideration of a grant scheduling type among various factors for determining a QoS level will be described. That is, the resource allocation wait time may be set in consideration of other factors that determine the QoS level, such as latency.

As shown in FIG. 3, the base station broadcasts resource allocation wait time for each grand scheduling type through SFH (S310).

Table 1 shows an example of resource allocation wait time for each grant scheduling type. In Table 1, the unit of resource allocation wait time is expressed in ms, but the unit of resource allocation wait time may be represented as a subframe, a frame, or a superframe.

QoS level Resource Allocation Wait Time (ms) Grant Scheduling Type Unsolicited Grant Service (UGS) 40 Real-time Polling Service (rtPS) 40 Extended-real-time Polling Service (ertPS) 40 Non-real-time polling service (nrtPS) 100 Best effort service BE 150

The terminal transmits the first bandwidth request indicator to the base station in order to transmit data having a real-time polling service (hereinafter, referred to as "rtPS") characteristic (S320), and waits for a resource allocation corresponding to the rtPS. Set to 40ms, which is the time. In this case, the bandwidth request indicator includes a grant scheduling type rtPS, a bandwidth request size 100 and a terminal identifier.

If there is no response from the base station within 40ms, the terminal transmits a second bandwidth request indicator (S330), and sets the timer to 40ms. When the UE receives an uplink resource from the base station within 40 ms (S340), the terminal stops the timer and transmits data through the allocated resource (S350).

Thereafter, the terminal transmits a third bandwidth request indicator to the base station to transmit data having a non-real-time polling service (hereinafter referred to as "nrtPS") characteristic (S360), and sends a timer to nrtPS. Set to 100 ms, the corresponding resource allocation wait time. In this case, the bandwidth request indicator includes a grant scheduling type nrtPS, a bandwidth request size 500, and a terminal identifier. When the terminal receives an uplink resource from the base station within 100 ms (S370), the terminal stops the timer and transmits data through the allocated resource (S380).

Now, a method for transmitting a bandwidth request in a wireless communication system according to a first embodiment of the present invention in a five-step scheme will be described with reference to FIGS. 4 and 5.

4 is a diagram illustrating a case where a response information waiting time for a BW-REQ message is set to be equal to a resource allocation waiting time in a five-step method, and FIG. 5 is a diagram illustrating a response information waiting time for a BW-REQ message in a five-step method. A diagram illustrating a case where a resource allocation wait time is set differently. Response time wait time for the BW-REQ message until the UE retransmits the bandwidth request indicator after receiving the acknowledgment / negative acknowledgment (ACK / NACK) for the BW-REQ message after transmitting the BW-REQ message. It's time to wait.

4 and 5, the base station broadcasts the resource allocation wait time for each grand scheduling type through the SFH (S410, S510).

The terminal transmits the first bandwidth request indicator to the base station (S420, S520) in order to transmit data having an nrtPS characteristic, and sets a timer to 100 ms, which is a resource allocation wait time corresponding to nrtPS. At this time, the bandwidth request indicator includes a grant scheduling type nrtPS, a bandwidth request size 100 and a terminal identifier.

If the UE receives an uplink resource from the base station within 100 ms (S430 and S530), the terminal stops the timer and transmits a BW-REQ message through the allocated resource (S440 and S540). The timer responds to the BW-REQ message. Set the information waiting time. In this case, as shown in FIG. 4, the response information waiting time for the BW-REQ message may be set to 100 ms, which is a resource allocation waiting time, or may be set to a value different from 100 ms, which is a resource allocation waiting time, as shown in FIG. 5.

If the terminal does not receive the response information for the BW-REQ message within the waiting time for the response information for the BW-REQ message, the terminal retransmits the second bandwidth request indicator (S460 and S560).

Next, a method for transmitting a bandwidth request in a wireless communication system according to a second embodiment of the present invention will be described with reference to FIG. 6.

6 is a view showing a bandwidth request transmission method of a wireless communication system according to a second embodiment of the present invention in a three-step manner.

In a second embodiment of the present invention, the base station transmits an index for each resource allocation wait time and resource allocation wait time, and transmits an index of resource allocation wait time corresponding to the connection through a MAC message.

As shown in FIG. 6, the base station broadcasts resource allocation wait time for each index through the SFH (S610).

Table 2 shows an example of resource allocation wait time for each index. In Table 2, the unit of resource allocation wait time is expressed in ms, but the unit of resource allocation wait time may be expressed as a subframe, a frame, or a superframe.

index Resource Allocation Wait Time One 40 2 100 3 150 4 200

The terminal transmits a dynamic service addition request (hereinafter referred to as "DSA-REQ") message to the base station in order to create a dynamic service connection (S620). In this case, the DSA-REQ message may include QoS level information of data to be transmitted by the terminal, and in FIG. 6, the DSA-REQ message includes rtPS, which is a grant scheduling type, as an example of the QoS level information.

In response to the DSA-REQ message, the base station informs the terminal of index 1 of the resource allocation waiting time to be used by the terminal through a dynamic service addition response (hereinafter referred to as a "DSA-RSP") message (S630).

The terminal transmits the first bandwidth request indicator to the base station in order to transmit data having a real-time polling service characteristic (S640), and sets the timer to 40 ms, which is a resource allocation wait time corresponding to the index 1. In this case, the bandwidth request indicator includes an index 1, a bandwidth request size 100 and a terminal identifier.

If there is no response from the base station within 40ms, the terminal transmits a second bandwidth request indicator (S650), and sets the timer to 40ms. When the UE receives an uplink resource from the base station within 40 ms (S660), the terminal stops the timer and transmits data through the allocated resource (S670).

According to the bandwidth request transmission method of the wireless communication system according to the second embodiment of the present invention, without allocating the same resource allocation wait time to the terminal having the same QoS level, the resource allocation wait to the terminal having the same QoS level according to the base station situation. The advantage is that time can be applied differently.

Next, a bandwidth request transmission method of a wireless communication system according to a third embodiment of the present invention will be described with reference to FIGS. 7 to 10. In a third embodiment of the present invention, the base station transmits a resource allocation wait time to be used by the terminal through a MAC message to the terminal.

In this case, the base station may transmit a resource allocation wait time to be used by the terminal in consideration of data to be transmitted by the terminal, or may transmit a resource allocation wait time set. The resource allocation wait time set may be resource allocation wait time for each grant scheduling type as shown in Table 1, or resource allocation wait time for each service type. Table 3 shows an example of resource allocation wait time for each service type.

QoS level Resource Allocation Wait Time Service type Real time service 40 Non-real time service 100

Hereinafter, a case in which the base station transmits a resource allocation waiting time to be used by the terminal in consideration of data to be transmitted by the terminal will be described.

FIG. 7 illustrates a case in which a DSA-RSP message is used in a bandwidth request transmission method of a wireless communication system according to a third embodiment of the present invention.

As shown in FIG. 7, the terminal transmits a DSA-REQ message to the base station to create a dynamic service connection (S710). At this time, the DSA-REQ message, the grant scheduling type of the data to be transmitted by the terminal includes rtPS.

Since rtPS is a real-time service, the base station informs the terminal of 40 ms, which is a resource allocation waiting time to be used by the terminal through the DSA-RSP message in response to the DSA-REQ message (S720).

The terminal transmits the first bandwidth request indicator to the base station in order to transmit data having a real-time polling service characteristic (S730), and sets a timer to 40 ms, which is a resource allocation wait time received from the base station. At this time, the bandwidth request indicator includes a service type real-time service, bandwidth request size 100 and a terminal identifier.

If there is no response from the base station within 40ms, the terminal transmits the second bandwidth request indicator (S740), and sets the timer to 40ms. When the UE receives an uplink resource from the base station within 40 ms (S750), the terminal stops the timer and transmits data through the allocated resource (S760).

8 is a diagram illustrating a case where an RNG-RSP message is used in a bandwidth request transmission method of a wireless communication system according to a third embodiment of the present invention.

As shown in Figure 8, the terminal transmits an RNG-REQ message to the base station to perform the initial network entry (S810). In response to the RNG-REQ message, the base station notifies the terminal of 40 ms, which is a resource allocation waiting time to be used by the terminal when transmitting signaling data through the RNG-RSP message (S820).

The terminal transmits the first bandwidth request indicator to the base station in order to transmit the signaling data (S830), and sets the timer to 40 ms which is a resource allocation waiting time received from the base station. At this time, the bandwidth request indicator includes a bandwidth request size 100 and a terminal identifier.

If there is no response from the base station within 40ms, the terminal transmits the second bandwidth request indicator (S840), and sets the timer to 40ms. When the UE receives an uplink resource from the base station within 40 ms (S850), the terminal stops the timer and transmits data through the allocated resource (S860).

Next, a bandwidth request transmission method for setting a resource allocation wait time according to the priority of the terminal in order to provide differentiated services according to the priority of the terminal will be described with reference to FIGS. 9 through 11.

The base station may know the priority of the terminal through the MAC message or the uplink allocation request message.

The base station may determine the priority of the terminal by a MAC address or a terminal identifier transmitted through a MAC message such as an RNG-REQ message or a DSA-REQ message. In addition, since the MAC message is transmitted through an uplink resource allocated by the base station to the terminal, the base station may determine which terminal the MAC message is sent as a resource on which the MAC message is transmitted, and thus may determine the priority of the terminal.

And, in the contention-based three-phase scheme, the priority of the terminal can be known through the terminal identifier transmitted through the bandwidth request indicator. In the non-competition based scheme, the priority of the terminal may be known through dedicated resources of the terminal such as a code or a resource region.

First, the bandwidth request information transmission method using the resource allocation wait time determined according to the priority of the UE without considering the QoS level of the data will be described with reference to FIG. 9. 9 is a diagram illustrating a method for transmitting a bandwidth request using one resource allocation wait time applicable to all connections of one terminal.

As shown in Figure 9, the terminal transmits an RNG-REQ message to the base station (S910). The base station determines the priority of the terminal by the MAC address included in the RNG-REQ message and informs the terminal of the resource allocation wait time of the terminal according to the priority through the RNG-RSP message (S920). For example, a resource allocation wait time of a terminal having a priority of 1 is 50 ms, a resource allocation wait time of a terminal having a priority of 2 is 150 ms, and if the priority of the terminal transmitting the RNG-REQ message is 1, 50 ms is RNG. Inform the terminal through an RSP message.

The terminal transmits the first bandwidth request indicator to the base station (S930) to transmit data having a real-time polling service characteristic, and sets a timer to 50 ms, which is a resource allocation waiting time received from the base station. At this time, the bandwidth request indicator includes a grant scheduling type rtPs, a bandwidth request size 100 and a terminal identifier. If there is no response from the base station within 50ms, the terminal transmits a second bandwidth request indicator (S940).

In addition, the terminal transmits a third bandwidth request indicator to the base station in order to transmit data having a non-real-time polling service characteristic (S950), and sets a timer to 50 ms, which is a resource allocation waiting time received from the base station. At this time, the bandwidth request indicator includes a grant scheduling type nrtPs, a bandwidth request size 100 and a terminal identifier. If there is no response from the base station within 50ms, the terminal transmits a fourth bandwidth request indicator (S960).

Table 4 shows an example of resource allocation wait time according to grant scheduling type and priority as a factor for determining QoS level. In Table 4, the unit of resource allocation waiting time is expressed in ms, but the unit of resource allocation waiting time may be expressed as a subframe, a frame, or a superframe.

As shown in Table 4, the resource allocation wait time for the emergency service and the control signaling message may be a fixed value.

value QoS level Resource Allocation Wait Time (ms) Grant scheduling type Priority 0000 Emergency - 50 0001 Control signaling - 50 0010 UGS - 50 0011 rtPS High 50 0100 rtPS Low 100 0101 ertPS - 50 0110 nrtPS High 150 0111 nrtPS Low 250 1000 BE - 300

Tables 5 and 6 are factors that determine the QoS level, and show an example of resource allocation wait time according to service type and priority. In Tables 5 and 6, the unit of resource allocation wait time is expressed in ms, but the unit of resource allocation wait time may be represented as a subframe, a frame, or a superframe. The service type may be classified into a real-time service and a non real-time service, and may be classified into a delay sensitive service and a delay tolerant service. .

When requesting an uplink resource for an emergency service or control signaling message, the UE uses resource allocation waiting time corresponding to real-time service and high in Table 5, or corresponds to delay sensitive service and high priority in Table 6 Resource allocation latency can be used.

value QoS level Resource Allocation Wait Time (ms) Service type Priority 00 real-time service High 50 01 real-time service Low 100 10 non real-time service High 200 11 non real-time service Low 250

value QoS level Resource Allocation Wait Time (ms) Service type Priority 00 delay sensitive service High 50 01 delay sensitive service Low 100 10 delay tolerant service High 200 11 delay tolerant service Low 250

FIG. 10 is a diagram illustrating transmission of resource allocation wait time determined according to QoS level through additional broadcast information and MAC message.

As shown in FIG. 10, the base station sends and receives MAC messages (RNG-REQ, RNG-RSP) in the process of ranging or MAC messages (DSA-REQ, DSA-RSP) in the process of creating a dynamic service. The resource allocation wait time corresponding to the QoS level of the data to be transmitted is transmitted through.

The base station transmits the resource allocation wait time determined according to the QoS level to the terminal by including the additional broadcast information. In this case, the unaltered resource allocation wait time value may not be included in the additional broadcast information. Resource allocation wait times do not change within a transmission interval of additional broadcast information.

Next, a method for transmitting bandwidth request information using a resource allocation wait time determined according to the QoS level of data and the priority of the UE will be described with reference to FIG. 11.

FIG. 11 is a diagram illustrating a method for transmitting a bandwidth request using resource allocation wait time according to QoS level for a plurality of connections of one terminal having a high priority.

As shown in Figure 11, the terminal transmits a DSA-REQ message to the base station (S111). The base station informs the terminal of the original allocation wait time according to the priority of the terminal and the grant scheduling type of data to be transmitted by the terminal through the DSA-RSP message (S112). Assuming that the resource allocation wait time shown in Table 4 is used, when the grant scheduling type of the data to be transmitted is rtPS and the priority of the scheduling type is High, 50 ms is informed to the UE through the DSA-RSP message.

The terminal transmits the first bandwidth request indicator to the base station in order to transmit data having a real-time polling service characteristic (S113), and sets a timer to 50 ms, which is a resource allocation waiting time received from the base station. At this time, the bandwidth request indicator includes a grant scheduling type rtPs, a bandwidth request size 100 and a terminal identifier. If there is no response from the base station within 50ms, the terminal transmits a second bandwidth request indicator (S114).

The terminal transmits a DSA-REQ message to the base station (S115), and the base station informs 300 ms of a resource allocation waiting time corresponding to the BE of the terminal having a priority through the DSA-REQ message.

Next, a bandwidth request transmission method of a wireless communication system according to a fourth embodiment of the present invention will be described with reference to FIG. 12. In the fourth embodiment of the present invention, the base station does not inform the terminal of the resource allocation waiting time, and the terminal uses the resource allocation waiting time for each QoS predetermined in the wireless communication system. For example, the resource allocation wait time corresponding to rtPS is 50 ms, and the resource allocation wait time corresponding to nrtPS is 100 ms.

12 is a diagram illustrating a bandwidth request transmission method of a wireless communication system according to a fourth embodiment.

As shown in FIG. 12, the terminal transmits a first bandwidth request indicator to the base station in order to transmit data having a real-time polling service characteristic (S121), and sets a timer to a resource allocation wait time corresponding to a predetermined rtPS at 50 ms. Set it. At this time, the bandwidth request indicator includes a grant scheduling type rtPs, a bandwidth request size 100 and a terminal identifier. If there is no response from the base station within 50ms, the terminal transmits a second bandwidth request indicator (S122).

In addition, the terminal transmits a third bandwidth request indicator to the base station in order to transmit data having a non-real-time polling service characteristic (S123), and sets a timer to 100 ms, which is a resource allocation waiting time corresponding to a predetermined nrtPS. In this case, the bandwidth request indicator includes a grant scheduling type rtPS, a bandwidth request size 100 and a terminal identifier. If there is no response from the base station within 100ms, the terminal transmits a fourth bandwidth request indicator (S124).

Next, after the base station receives the bandwidth request indicator or the BW-REQ message, a process of allocating resources to the terminal for the resource allocation time determined in consideration of the resource allocation waiting time of the terminal will be described.

13 is a flowchart illustrating a resource allocation process of a base station. The base station receives the bandwidth request indicator or the BW-REQ message from the terminal (S131), and decodes.

If the bandwidth request indicator or the BW-REQ message is normally decoded, the base station transmits an ACK message to the terminal (S133a). If not, the base station transmits a NACK message to the terminal (S133b). At this time, the step (S133a, S133b) for transmitting the response information can be omitted.

The base station determines a resource allocation wait time used by the terminal by checking parameters such as a bandwidth request indicator or a QoS level of the BW-REQ message or a timer index (S134), and allocates a resource from the resource allocation wait time used by the terminal. The timer is set by calculating the time (S135). For example, if the resource allocation wait time of the terminal is 40ms, the base station may use the value obtained by subtracting the roundtrip delay from 40ms as the resource allocation time.

The scheduler of the base station determines whether to allocate resources (S136). If the resource allocation is possible (S137), the base station allocates resources to the terminal (S138), if the resource allocation is not possible, the base station checks whether the timer expires (S139). If the timer has expired, resource allocation is terminated. If the timer has not expired, it is determined whether to allocate the resource again. That is, the base station determines whether to allocate resources until the timer expires.

Now, a case in which the terminal sets a timer after receiving response information about the bandwidth request indicator will be described with reference to FIG. 14. 14 is a diagram illustrating a case in which a terminal sets a timer after receiving response information about a bandwidth request indicator.

As shown in FIG. 14, the base station broadcasts resource allocation wait time for each grand scheduling type through the SFH (S141). The terminal transmits the data having the nrtPS characteristic to the first bandwidth request indicator base station (S142), and receives response information for all the bandwidth request indicators received by the base station (S143). If the transmission of the bandwidth request indicator sent by the terminal fails, the terminal transmits the second bandwidth request indicator (S144).

The terminal receives response information for all the bandwidth request indicators received by the base station (S145).

When the terminal determines that the transmission of the bandwidth request indicator sent by the terminal is successful, the terminal sets the timer to 100 ms, which is a resource allocation waiting time corresponding to nrtPS. If a resource is allocated from the base station within 100 ms (S146), data is transmitted through the allocated resource (S147). If the resource is not allocated from the base station within 100 ms, the terminal retransmits the bandwidth request indicator. At this time, the number of retries may be limited.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In a hardware implementation, the method for performing a bandwidth request process according to an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), and PLDs ( programmable logic devices (FPGAs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, the method for performing a bandwidth request process according to an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

1 is a diagram illustrating a resource allocation process of a conventional wireless communication system.

2 is a diagram illustrating a resource allocation process of a wireless communication system according to an embodiment of the present invention.

3 is a diagram illustrating a method for performing a bandwidth request process in a wireless communication system according to a first embodiment of the present invention in a three-step manner.

4 is a diagram illustrating a case in which a response information waiting time for a BW-REQ message is set equal to a resource allocation waiting time in a five-step method.

FIG. 5 is a diagram illustrating a case where a response information waiting time for a BW-REQ message is set differently from a resource allocation waiting time in a five-step method.

6 is a diagram illustrating a method for performing a bandwidth request process in a wireless communication system according to a second embodiment of the present invention in a three-step manner.

FIG. 7 illustrates a case in which a DSA-RSP message is used in a bandwidth request transmission method of a wireless communication system according to a third embodiment of the present invention.

8 is a diagram illustrating a case where an RNG-RSP message is used in a method for performing a bandwidth request process in a wireless communication system according to a third embodiment of the present invention.

9 is a diagram illustrating a method of performing a bandwidth request process using one resource allocation wait time applicable to all connections of one terminal.

FIG. 10 is a diagram illustrating a method for performing a bandwidth request process using a resource allocation wait time according to QoS levels for a plurality of connections of one terminal.

11 is a diagram illustrating a method for performing a bandwidth request process in a wireless communication system according to a fourth embodiment.

12 is a flowchart illustrating a resource allocation process of a base station.

FIG. 13 is a diagram illustrating a case in which a terminal sets a timer after receiving response information about a bandwidth request indicator.

Claims (11)

A method for performing a bandwidth request process through random access in a terminal of a wireless communication system, Sending a first bandwidth request to a base station to request resource allocation for data transmission; And And transmitting a second bandwidth request to the base station if there is no response from the base station during the first resource allocation waiting time that is variably determined. The method of claim 1, The first resource allocation wait time is variably determined according to at least one of the QoS level of the data and the priority of the terminal. The method of claim 2, And receiving the resource allocation wait time for each QoS level from the base station through a broadcast message. The method of claim 3, And the first resource allocation wait time is a resource allocation wait time corresponding to a QoS level of the data in the resource allocation wait time for each QoS level. The method of claim 4, wherein Receiving uplink resources from the base station; Transmitting a bandwidth request message through the allocated uplink resources; And And sending a third bandwidth request to the base station if there is no response from the base station during a second resource allocation wait time. The method of claim 5, And the second resource allocation wait time is the same as the first resource allocation wait time. The method of claim 1, Receiving a resource allocation waiting time for each index from the base station through a broadcast message; Sending a MAC message to the base station, the MAC message comprising information regarding a QoS level of the data; And Receiving the index of the resource allocation wait time determined in consideration of the QoS level in the resource allocation wait time for each index from the base station, And the first resource allocation wait time is a resource allocation wait time corresponding to the received index. The method of claim 1, Sending a MAC message to the base station, the MAC message comprising information regarding a QoS level of the data; And And receiving a MAC message including the first resource allocation wait time determined from the base station in consideration of the QoS level. The method of claim 1, And the first resource allocation wait time is a resource allocation wait time corresponding to a QoS level of the data in a predetermined resource allocation wait time for each QoS level. A terminal for performing a bandwidth request process through a random access in a wireless communication system, Sending a first bandwidth request to a base station to request resource allocation for data transmission; And And resending a second bandwidth request to the base station if there is no response from the base station during the first resource allocation waiting time that is variably determined. The method of claim 10, The first resource allocation wait time is determined according to at least one of the QoS level of the data and the priority of the terminal.

Images