KR20050042718A - Method for assigning reverse-link channel in a mobile communication system - Google Patents

Abstract

The present invention proposes a method for allocating radio resources differentially according to the priority of a mobile station in a mobile communication system. To this end, if the mobile stations that do not have the highest priority are to be assigned the reverse channel, they are entitled to request the assignment of the reverse channel through competition between the mobile stations, and only the qualified mobile terminals have the highest priority. The reverse channel can be allocated through competition with the mobile station having the rank. Therefore, it is possible to provide differentiated services according to priorities.

Description

Reverse channel allocation method in mobile communication system {METHOD FOR ASSIGNING REVERSE-LINK CHANNEL IN A MOBILE COMMUNICATION SYSTEM}

The present invention relates to a method for allocating radio resources in a mobile communication system, and more particularly, to a method for allocating radio resources by priority of a mobile terminal.

Today, due to the development of mobile communication technology, various mobile communication systems as well as existing voice services have been developed into high-speed, high-quality wireless data packet communication systems that provide data services and multimedia services instead of providing initial voice-oriented services. Doing.

In such a mobile communication environment, there has been a continuous demand for efficient utilization of limited radio resources, that is, wireless channels. For example, in a mobile communication system, users having various channel environments and various traffic attributes share radio resources. To this end, there is a need for an efficient way to request shared resources.

For example, in order to be allocated reverse radio resources in a situation where there is no radio resource pre-allocated for each user, the mobile station must transmit a signal for requesting radio resource allocation to the base station by a contention method.

In the second generation mobile communication system, the resource is allocated exclusively regardless of whether the data is transmitted or received until the service is terminated after initially requesting the resource to the base station in a competitive manner mainly considering only a circuit type voice service. Therefore, since the initial access method does not significantly affect the quality of service, all users initially attempt to access radio resources under equal conditions.

However, in the 3rd generation mobile communication system, real-time services such as voice service mainly use the circuit method to guarantee the quality of service, and non-real-time services such as data service support the packet method to support resources than the 2nd generation mobile communication system. It can be used efficiently. In recent research, an attempt has been made to support a real-time service such as a voice service in a packet manner. For example, a resource request signal is initially transmitted in a competitive manner, and then a resource request signal through a dedicated control channel is transmitted in a non-competitive manner. When data channels are allocated through this, real-time and non-real-time services share resources by returning immediately after using the data channel.

As a result, in the next generation mobile communication system, all services will be allocated resources in a competitive manner. In order to guarantee the quality of various services in such a competitive service, differentiation must first be made in the procedure of transmitting a request signal. On the other hand, when an inter-cell handoff occurs in a packet-based service, the mobile station may initiate handoff through a contention scheme. In this process, a differentiated access scheme can be used to differentiate between a new call and a handoff call. In other words, differentiated access methods can create a foundation for efficiently utilizing limited common resources. And it can efficiently support differentiation by service, differentiation by user, and differentiation between new call and handoff call.

Accordingly, an object of the present invention for solving the above problems is to provide a method for allowing radio resources to be differentially allocated according to the priority of a mobile terminal.

Another object of the present invention is to provide a method for allowing radio resources to be allocated to a mobile station having a highest priority by a simplified procedure compared to a mobile terminal having a relatively low priority.

It is still another object of the present invention to provide a method for allowing a mobile terminal having a relatively low priority to compete with a mobile terminal having the highest priority in order to be allocated radio resources only when it is qualified through competition for entitlement. In providing.

Another object of the present invention is to provide a method for a base station to perform a resource allocation procedure differentiated according to the priorities of mobile stations.

In a first aspect for achieving the above object, the present invention provides a method for a mobile terminal to be allocated a reverse channel in a mobile communication system comprising a base station and a plurality of mobile terminals located in the base station. If the base station does not have the highest priority among all priorities that can be given to the mobile station to which the reverse channel is allocated in the base station, the base station is entitled to request resource allocation for the reverse channel. And a process for requesting resource allocation to the base station when the qualification is granted, thereby competing for allocation of the reverse channel with another mobile terminal having the highest priority in the base station and the other mobile terminal with the qualification. And a process of allocating resources for the reverse channel.

In a second aspect for achieving the above object, the present invention provides a mobile communication system comprising a base station and a plurality of mobile terminals to be allocated a reverse channel in the base station, the base station is connected to the mobile terminal; 1. A method of allocating a reverse channel for a reverse channel, when receiving an entitlement request message from the mobile station, granting the mobile station a qualification for requesting allocation of resources for the reverse channel; Allocating resources for the reverse channel by a resource allocation request from the mobile station having the highest priority among all priorities that can be given to the mobile station and the mobile station to which the reverse channel is allocated in the base station. Characterized by including the process.

In a third aspect for achieving the above object, the present invention provides a method for allocating a reverse channel for the mobile terminals in a mobile communication system including a base station and a plurality of mobile terminals located in the base station. In the base station, the mobile station that does not have the highest priority among all the priority that can be given to the mobile station to be allocated to the reverse channel in the base station is entitled to request the allocation of resources for the reverse channel Requesting to give, and when the base station receives an entitlement request from the mobile station, granting the mobile station a qualification to request resource allocation for the reverse channel, and the highest priority; Resource allocation for the reverse channel by the mobile terminal having the license and the qualified mobile terminal And requesting resource allocation requests from the mobile station having the highest priority and the qualified mobile station by the base station, and allocating resources for the reverse channel. The resource for the channel is allocated by the competition between the mobile terminal having the highest priority and the mobile terminal entitled.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. DETAILED DESCRIPTION In the following detailed description, one representative embodiment of the present invention is set forth in order to achieve the above technical problem. And other embodiments that can be presented with the present invention are replaced by the description in the configuration of the present invention.

In order to efficiently provide services of various quality (Quality of Service) in the mobile communication system, differentiation is required according to service grade, user grade, handoff call status, and the like. To support this, differentiation must first be made in the request for resources. Accordingly, the present invention proposes a reverse access control scheme that can effectively provide services having various priorities, and newly defines an operation scheme of the mobile station and a base station and a message structure according to the above for efficiently performing these schemes.

In the present invention to be described later, if the mobile stations that do not have the highest priority are to be assigned the reverse channel, the mobile terminal is entitled to request the allocation of the reverse channel through the competition between the mobile terminals, and only the mobile terminals that have been qualified This allows the reverse channel to be allocated through competition with the mobile station having the highest priority.

1 is a diagram illustrating a reverse frame structure for applying an embodiment of the present invention to an orthogonal frequency division mobile communication system. As shown in FIG. 1, one frame may be divided into an access period and a data / control signal period. In the access period, messages are transmitted between the mobile station and the base station for the allocation of radio resources. The messages transmitted through the access period include a resource allocation request message and a request for request (RFR) message. Through the data / control signal interval, data and control signals for a specific service are transmitted.

2 and 3 illustrate examples of message transmission between a mobile station and a base station for allocating radio resources according to an embodiment of the present invention. 2 illustrates an example of transmitting a message between a mobile station having a highest priority and a base station, and FIG. 3 illustrates an example of transmitting a message between a mobile station having a relatively low priority and a base station. The priority used in the present invention may be determined in consideration of a service grade, a user's grade, handover status, and the like, and may be used as a term referring to the other priorities except for the highest priority. have.

Referring to FIG. 2, the mobile station (MS) having the highest priority in consideration of at least two quality of service (QoS) base stations transmits a resource allocation request message to receive a reverse shared resource. (BS; Base Station). The resource allocation request message has a structure shown in FIG. 8A. Referring to FIG. 8A, the resource allocation request message includes a unique ID in a cell and an access parameter for distinguishing it from other mobile terminals existing in the same cell. The access parameter may be an amount of resources to be requested, a maximum delay bound, a pilot signal of a reverse link, and the like. The base station receiving the resource allocation request message allocates an appropriate amount of resources to the mobile station in consideration of the system load, channel environment, and the like. The allocated resource information is transmitted to the mobile terminal through a resource allocation response message. The mobile station performs a desired service based on the resource information provided through the resource allocation response message. Hereinafter, a procedure for transmitting / receiving the resource allocation request message and the resource allocation approval message will be referred to as a "resource allocation procedure". When the desired service is terminated, the used resource is returned to the base station. However, if a response message indicating that the resource allocation response message is not received or resource allocation cannot be received, the above-described procedure is performed again after going back-off.

Referring to FIG. 3, a mobile terminal having a relatively low priority in consideration of at least two quality of service must obtain a qualification for requesting resource allocation before performing the procedure illustrated in FIG. 2. The procedure for obtaining the qualification is referred to as a "qualification phase." The mobile station transmits an RFR message to the base station in order to be entitled to request allocation of reverse shared resources. The RFR message has the structure shown in FIG. 8B. Referring to FIG. 8B, the RFR message includes priority information for specifying various priorities and a temporary ID for distinguishing a mobile station within the designated priorities. For example, in the case of a mobile communication system that supports all five classes of priority, priority information is expressed as 2 bits because only four priorities can be specified except the highest priority. Can be. The temporary identifier may be transmitted within a few bits because it is not necessarily uniquely distinguished from other mobile terminals capable of transmitting an RFR message without collision in the same frame. The value transmitted through the RFR message is referred to as an "RFR value". The RFR value is used by the base station to qualify the mobile station. In the following description, it is considered that the smaller the RFR value, the higher the temporary priority.

Upon receiving the RFR message, the base station determines whether to grant the right to request resource allocation for the mobile station. The base station transmits a qualification message to the mobile stations that have transmitted the RFR message by the determination. The method for qualifying the mobile station from which the base station transmits the RFR message may be performed by various methods. On the other hand, two methods newly proposed in the present invention will be described later. On the other hand, entitlement in the present invention means that the mobile terminal having the highest priority has the qualification to compete for resource allocation. When the mobile station receives the entitlement message, the mobile station performs the resource allocation procedure described with reference to FIG. 2.

Meanwhile, according to the above-described procedure of FIG. 3, mobile terminals competing with the mobile terminal having the highest priority have a problem in that the entitlement procedure needs to be performed again because the resources are not allocated through the resource allocation procedure. Therefore, in the present invention, the persistence test based on the persistence value provided through the entitlement message is performed. The result of the persistence test determines whether to perform the entitlement procedure again or only the resource allocation procedure.

In the present invention, two new proposed methods for qualifying a mobile station that transmits an RFR message are as follows.

In the first method, the RFR message is checked for collision, and only mobile terminals which do not have a collision can be qualified by a qualification value (hereinafter referred to as "Q-value"). Typically, the UE can check whether a collision has occurred in the RFR message transmitted to the base station. For example, the base station specifies "success" or "fail" in the feed-back information for each resource and not for each mobile station. In this case, the mobile station may check the feed-back information on the resource transmitted by the mobile station and recognize whether or not the RFR message transmitted by the mobile station collides according to the specification of success or failure. That is, the base station will be able to successfully receive only RFR messages that do not have a collision, and provide feed-back information designated as "Success" for these resources. On the other hand, the Q-value used for checking whether the mobile terminal without collision has been qualified is broadcasted every frame by the base station. The mobile station which does not have the collision monitors the Q-value, and performs a resource allocation procedure when the RFR value transmitted by the mobile station is smaller than the Q-value. Accordingly, the base station may control mobile terminals to be qualified by the Q-value.

In the second method, the feed-back information is used to qualify mobile terminals using a specific resource. In this case, unqualified mobile terminals can be further qualified by Q-value. In this case, the base station not only determines success or failure transmitted through the feedback information, but also considers a specific resource to be qualified. That is, by specifying success for a specific resource, all mobile terminals using the specific resource are qualified. And by allowing the base station to broadcast the Q-value, even if it is not qualified by the feed-back information, it can be qualified by the Q-value. Therefore, if the above-described second method is applied, only the mobile terminal having the RF-value greater than the Q-value is received and the feed-back information specified as a failure is not qualified.

Hereinafter, operations of a mobile station and a base station according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the two methods described above will be described separately as the first embodiment and the second embodiment.

1. First embodiment

Hereinafter, a first embodiment of the present invention will be described in detail with respect to an operation of granting a qualification for requesting resource allocation using only a Q-value to a mobile terminal in which an RFR message collision does not occur. In the following description, the operation of the mobile station and the base station will be described with reference to the accompanying drawings.

Description of operation for mobile terminal

4 to 6 are views for explaining the operation of the mobile terminal according to an embodiment of the present invention.

4 to 6, when a specific service is required, the mobile station determines its priority in consideration of two or more QoS classes. In the following description, the specific service will be limited to the packet service. However, the present invention should not be construed as being limited to packet services. In step 410, the mobile station determines whether a priority determined for transmitting a data packet is a first priority (highest priority). If it is determined that data packet transmission based on the first priority is required in the above process, the process proceeds to step 420. Otherwise, if it is determined that data packet transmission with a relatively low priority (remaining priority except the first priority, hereinafter referred to as "second priority") is required, the flow proceeds to step 430. The mobile station performs a first subroutine for data packet transmission according to the first priority in step 420, and performs a second subroutine for data packet transmission according to the second priority in step 430. A detailed procedure according to the first subroutine is shown in FIG. 5, and a specific procedure according to the second subroutine is shown in FIG. 6.

First, referring to FIG. 5, the mobile station generates a resource allocation request message in step 510. At this time, the resource allocation request message includes an identifier and an access parameter for distinguishing it from other mobile terminals in the cell. The access parameter may be determined in consideration of an amount of resources to be requested, a maximum delay bound, a pilot signal of a reverse link, and the like. The mobile station transmits the resource allocation request message to the base station in step 512. In step 514, the mobile station monitors whether a resource allocation approval message is received in response to the resource allocation request message. When the resource allocation approval message is received in step 514, the mobile station proceeds to step 518 to transmit a desired data packet. At this time, the transmission of the data packet will be made by the resource according to the access parameter requested by the resource allocation request message. That is, it will be an appropriate resource for transmitting the data packet according to the first priority. However, if a message indicating that the resource allocation approval message is not received or a desired resource cannot be allocated in step 512 is received, the mobile station proceeds to step 516 to perform a back-off process. Returning to step 510 to repeat the above process. The back-off process means maintaining the standby state for a certain time.

Next, referring to FIG. 6, the mobile terminal performs a "qualification procedure" through steps 610 to 616. In step 610, the mobile terminal generates an RFR message for receiving a qualification for requesting resource allocation. The RFR message may be generated by priority information specifying various priorities and a temporary ID for distinguishing a mobile station within the designated priority. Hereinafter, a value composed of the priority information and the temporary identifier is referred to as an "RFR value". In step 612, the mobile station transmits the RFR message to a base station. The mobile station then proceeds to step 614 to monitor whether an entitlement message in response to the RFR message is received from the base station. The mobile station receives a Qualified ID and a Persistence value through the entitlement message. The entitlement message has the structure shown in FIG. 8C. Referring to FIG. 8C, the entitlement message includes a Qualified ID for distinguishing the granted qualification and a Persistence value for the Persistence Test. The Qualified ID is a value that the mobile station should receive when there is no collision of the RFR message, and may be used to determine whether the mobile station is entitled to request channel allocation. That is, the Qualified ID corresponds to the Q-value defined above. This Q-value is not an identifier for a feed-back transmitted by the base station to each mobile station, but simply information broadcast in a cell every frame. Although not posted in FIG. 6, the MS may additionally perform a procedure for checking whether a collision has occurred in the RFR message transmitted by the MS. As an example, the base station specifies success or failure for each resource for RFR and transmits it, and the mobile station can check whether the RFR message is collided by the specified success or failure corresponding to the resource used by the base station. When the mobile station receives the Q-value through the entitlement message in step 614, the mobile station determines whether the RFR value transmitted by the mobile station is smaller than the Q-value. When the RFR value is smaller than the Q-value, it means that the mobile terminal having the first priority is in a state where it can compete with resource allocation. Therefore, the mobile station proceeds to step 618 to perform a resource allocation procedure. However, if the entitlement message is not received or the RFR value transmitted by the self is greater than the Q-value, the mobile station proceeds to step 616 to perform the back-off process and then repeats the above-described process. .

The mobile station proceeds to step 618 to generate a resource allocation request message for competition for resource allocation with the mobile station having the first priority. In this case, the resource allocation request message includes an identifier and an access parameter for distinguishing it from other mobile terminals in the cell. The access parameter is determined in consideration of the amount of resources to be requested, a maximum delay bound, a pilot signal of the reverse link, and the like. The mobile station transmits the resource allocation request message to the base station in step 620. In step 622, the mobile station monitors whether a resource allocation approval message is received in response to the resource allocation request message. When receiving the resource allocation approval message in step 622, the mobile station proceeds to step 630 and transmits a desired data packet. At this time, the transmission of the data packet will be made by the resource according to the access parameter which is requested through the resource allocation request message. That is, it will be an appropriate resource for transmitting the data packet according to the second priority. However, if a message indicating that the resource allocation approval message is not received or a desired resource cannot be allocated in step 622 is received, the mobile terminal proceeds to step 624 to perform a persistence test. The persistence test is made by the persistence value provided from the base station via the entitlement message.

The persistence test is to solve the problem of having to perform the entitlement procedure again when the qualified mobile terminal is not allocated resources even under a small load. In other words, in a situation where the load is small, the mobile terminal, which has undergone persistence tests, may remain in the resource allocation procedure even if the mobile terminal is not allocated resources. The mobile terminal determines whether the persistence test succeeds in step 626. If the persistence test is successful, the mobile terminal proceeds to step 628 to perform the back-off process and then repeats the aforementioned resource allocation procedure. However, if the persistence test is not successful, the mobile terminal performs the entitlement procedure after performing the back-off process in step 616.

As described above, according to the embodiment of the present invention, the mobile station having the highest priority may be allocated resources from the base station through only the resource allocation procedure without going through the qualification procedure. However, a mobile terminal with a relatively low priority can compete with the mobile terminal having the highest priority in order to allocate resources only if it is qualified through an entitlement procedure.

Description of operation for the base station

7 is a view for explaining the operation of the base station according to an embodiment of the present invention.

Referring to FIG. 7, the base station monitors whether an RFR message from the mobile station is received in step 710. In step 712, it is monitored whether a resource allocation request message is received from the mobile station. The resource allocation request message is received from the mobile terminal having the highest priority (first priority) or the mobile terminal of the second priority qualified by the entitlement procedure. The RFR message is received from a mobile terminal having a second priority. Accordingly, when the base station receives the resource allocation request message, the base station performs a procedure for allocating resources through steps 718 and 720. Otherwise, if the RFR message is received, the base station performs a procedure for entitlement through steps 714 and 716.

The base station proceeds to step 714 when receiving the RFR message. The base station determines a qualified ID and a persistence value in step 714. The entitlement identifier determines the number of mobile terminals that can request resource allocation, and determines the minimum value among the RFR values of the mobile terminals entitled to the determined number. The persistence value is determined by a probability value that a mobile terminal to which a qualified mobile terminal remains in the resource allocation procedure for mobile terminals that do not have the highest priority in consideration of the system load, the current system capacity, and the like. The RFR message of the mobile station has a smaller RFR value with higher priority. Therefore, the base station assigns and broadcasts the lowest RFR value among the RFR values of mobile terminals to be qualified as a Qualified ID, so that the mobile station has a qualification only to mobile terminals having a smaller RFR value. In step 716, the base station sets the entitlement identifier and the persistence value in an entitlement message and transmits the entitlement message to the corresponding mobile terminal. The base station proceeds to step 710.

Next, when the base station receives the resource allocation request message, the base station proceeds to step 718. In step 718, the base station allocates an appropriate resource for the mobile station in consideration of the load of the system and the access parameter provided through the resource allocation request message. Thereafter, in step 720, the base station includes the allocated resource information in a resource allocation approval message and transmits the received resource information to the mobile station.

As described above, by applying the embodiment of the present invention, the base station can allocate resources to the mobile station having the highest priority by resource allocation request, and the other mobile terminals are entitled to resource allocation. Resource allocation can only be requested for mobile terminals. This makes it possible to allocate limited resources more efficiently.

2. Second embodiment

In the case of the first embodiment described above, although there are many resources capable of transmitting a resource allocation request message in the actual system, there may be a situation where a lot of collisions of the RFR message occur in the qualification procedure. In such a situation, there is a situation that the base station has many resources for request that the base station can give to the mobile terminal, but cannot qualify because there is no candidate (candidate) to qualify. In order to prevent such a case, in the second embodiment, the base station sets and broadcasts a Q-value, and the RFR mobile terminals (mobile terminals that have transmitted the RFR message) confirming this value have feedback information on the corresponding resource "Fail". Even so, qualifications can be granted. That is, if the mobile station transmits the RFR message, the resource allocation procedure is performed by determining that the RFR value is less than the Q-value from the base station regardless of the feedback information. In the second embodiment to be described later, the mobile terminal, which is entitled to use the persistence test, is prevented from performing the entitlement procedure again because the mobile terminal has not been allocated resources.

Description of operation for mobile terminal

Hereinafter, the operation of the mobile terminal according to the second embodiment of the present invention will be described.

When a packet to be transmitted to the base station occurs, the mobile station determines the priority according to the grade of service, the grade of the user, handoff or the like.

When the mobile station determines the highest priority, the mobile station transmits a resource allocation request message to the base station by using the resource for the resource allocation request. The resource allocation request message may use the same type of message as in the above-described first embodiment. Thus, the resource allocation message includes an identifier and an access parameter that can be uniquely distinguished from other mobile terminals in the cell. After the mobile station transmits the resource allocation request message and receives a response from the base station, the mobile station starts to transmit desired data in the next frame. However, if the base station does not receive a response or receives a response indicating that the resource cannot be allocated, the above-described process may be repeated after the back-off process.

Otherwise, the mobile terminal determined to be lower than the highest priority transmits an entitlement request message to the base station using a predetermined resource. The entitlement request message may use the same type of message as in the above-described first embodiment. Accordingly, the entitlement request message includes a portion for specifying the determined priority and a temporary identifier for distinguishing the mobile station within the designated priority. The value transmitted by the entitlement assignment message is called an RFR value. This RFR value is used by the base station to qualify the mobile station. At this time, it is considered that the smaller the RFR value, the higher the temporary priority. After the mobile station transmits the entitlement request message and receives entitlement from the base station, the mobile station competes with the mobile stations having the highest priority by transmitting a resource allocation request message in the next frame.

The mobile terminal checks two messages to determine whether the mobile station has qualified. First, the mobile station checks whether it is qualified for itself from the feedback information on the resource for the RFR packet (resource allocation request message) used by the mobile station. The base station designates the feedback information on a specific resource as "Success", thereby granting a qualification to the mobile terminal using the resource. Secondly, the base station broadcasts a Qualification value to qualify mobile terminals that are not qualified by the feedback information. Accordingly, the mobile station having the RFR value lower than the Qualification value among mobile stations that transmit the RFR packet can be qualified. As a result, the feedback information on the resource is set to "Fail", and only a mobile terminal having an RFR value larger than the qualification value is not qualified. The non-qualified mobile terminal may repeat the above-described processes after the back-off process. On the other hand, the qualified mobile terminal performs a resource allocation procedure for acquiring resources through competition with the mobile terminal having the highest priority and other mobile terminals.

Description of operation for the base station

Hereinafter, the operation of the base station according to the second embodiment of the present invention will be described in detail.

The base station may receive a resource allocation request message from a mobile terminal having the highest priority or qualified terminals or an entitlement request message from mobile terminals having the highest priority at every access period. .

When receiving the resource allocation request message, the base station allocates an appropriate resource for each mobile station in consideration of system load and access parameters in the resource allocation request message. However, when receiving the entitlement request message, the base station determines the maximum number of terminals that can request resource allocation in consideration of system load and current system capacity. Is determined. This is the number of resources for the resource allocation request , Load of the mobile stations with the highest predicted priority in the first frame It is determined as shown in Equation 1 below.

At this time, Is a differentiation parameter that determines how long the initial access delay time of mobile stations with the highest priority can be guaranteed. The smaller the number, the more likely to reduce the connection delay time of the mobile station with the highest priority. Generally Can be set to 1.

Number of entitlement assignment messages successfully sent by the mobile station ( ), Based on the order of each RFR value, we set up the feedback information about the resource for each RFR packet and eventually Set as "Success" as many as. When only this feedback information is used, the RFR packets are frequently collided because the resources for the RFR packets are limited when the highest priority load is small and the low priority load is relatively large. therefore Even if it becomes smaller and can qualify for more mobile terminals, it may not be possible. To compensate for this, the base station sets a qualification value through an appropriate prediction process, and low priority mobile terminals can be qualified when the RFR value is smaller than the qualification value.

Given that the number of mobile terminals with the highest priority is small, the number of mobile terminals with other priorities will be generally proportional, so that even if it is possible to qualify for more mobile terminals in the end, This is usually the case when the overall system load is small. Therefore, the mobile station using each RFR value is assumed to be about 1 mobile station. ) Is set as in Equation 2 below.

At this time, The number of types of overall priority, Means the number of possible temporary IDs. finally Denotes the number of possible RFR values. Differentiation parameter Like You can adjust the class difference of access delay time by using. The smaller this value, the shorter the access delay time of the mobile station with the highest priority.

As described above, the present invention performs differential reverse access control according to the priority of the mobile station, thereby ensuring the reverse connection delay time for the transmission of data packets to the mobile station having the highest priority, It has the effect of reducing collision. In addition, the base station has the advantage that it is possible to centrally manage the reverse connection adaptive to the situation of the system.

1 is a view showing a reverse frame structure supporting an orthogonal frequency division scheme according to an embodiment of the present invention.

2 is a diagram illustrating an example of transmitting a message when allocating a channel to a mobile station having the highest priority according to an embodiment of the present invention.

3 is a diagram illustrating an example of transmitting a message when allocating a channel to a mobile station having a relatively low priority according to an embodiment of the present invention.

4 is a view showing a control flow performed by a mobile terminal according to an embodiment of the present invention.

FIG. 5 shows a control flow according to a subroutine for transmitting data at the highest priority in FIG. 4. FIG.

FIG. 6 illustrates a control flow according to a subroutine for transmitting data at a relatively low priority in FIG. 4. FIG.

7 is a diagram illustrating a control flow for resource allocation by priority in a base station according to an embodiment of the present invention.

8A to 8C illustrate a message structure used for an embodiment of the present invention.

Claims (22)

In a mobile communication system comprising a base station and a plurality of mobile terminals located within the base station, the mobile terminal is assigned a reverse channel, If the base station does not have the highest priority among all the priorities that can be assigned to the mobile station to be allocated to the reverse channel, the process of being entitled to request the resource allocation for the reverse channel from the base station and , When the entitlement is granted, the UE allocates a resource allocation to the base station to the reverse channel through a competition for allocating the reverse channel with another mobile terminal having the highest priority and the other mobile terminal with the entitlement. The method comprising the step of receiving a resource for the. The method of claim 1, wherein the qualifying process comprises: Sending an entitlement request message to the base station, the entitlement request message including a temporary identifier capable of distinguishing its own priority and mobile terminals having the same priority; And determining whether to qualify by the entitlement information from the base station in response to the entitlement request message. The method as claimed in claim 2, wherein the entitlement information includes feedback information provided for each resource, and the mobile terminal determines that the entitlement is granted when the feedback information has success information. The method according to claim 3, wherein the entitlement information has a predetermined value, and if the RFR value transmitted through the entitlement request message is smaller than the predetermined value even though the mobile terminal is not qualified by the feedback information. Said method of claiming to be entitled. 3. The method of claim 2, wherein the entitlement information has a predetermined value, and if the RFR value transmitted through the entitlement request message is smaller than the predetermined value when the collision of the entitlement request message has not occurred. Said method of claiming to be entitled. The method of claim 1, further comprising: allocating resources for the reverse channel through competition with another mobile terminal having the highest priority and another mobile terminal that has been qualified in the base station. Said method comprising: a. In a mobile communication system comprising a base station and a plurality of mobile terminals to be assigned a reverse channel in the base station, the base station allocates a reverse channel to the mobile terminal, Receiving an entitlement request message from the mobile station, granting the mobile station a qualification to request allocation of resources for the reverse channel; The resource allocation request from the mobile station having the highest priority among all the priorities that can be given to the mobile station to which the mobile station to be allocated the reverse channel in the base station and the base station is assigned. And allocating resources. 8. The method as claimed in claim 7, wherein the entitlement request message includes a temporary identifier for distinguishing a priority of a corresponding mobile terminal from mobile terminals having the same priority in the base station. The method of claim 8, wherein the qualifying process comprises: Determining a mobile terminal to be qualified from among mobile terminals which received the entitlement request message in consideration of the load of the system and the capacity of the current system; Setting a maximum value of RFR values including priority and temporary identifiers of entitlement request messages received from the qualified mobile terminals as an entitlement identifier; And sending an entitlement message including the entitlement identifier to the entitled mobile terminals. The method as claimed in claim 9, further comprising transmitting feedback information indicating whether the entitlement request message has been received for each resource used by the mobile terminal receiving the entitlement request message. 8. The method of claim 7, wherein the maximum number of mobile terminals to which the qualification is to be made ( ) Is determined by Equation 3 below. here, Is the number of resources for the resource allocation request, Is Load of mobile stations with the highest predicted priority in the first frame, Is a differentiation parameter that determines how much the initial access delay time of mobile stations with the highest priority can be guaranteed. 12. The method as claimed in claim 11, wherein success information about as many mobile terminals as determined by Equation (4) is set as feedback information and transmitted. here, Wow Is the number of entitlement assignment messages successfully sent by the mobile station. The method of claim 12, further comprising: a reference value for qualifying mobile terminals that are not qualified by the feedback information. ) Is determined by Equation 5 and transmitted. here, Is the number of kinds of overall priority, Is the number of possible temporary identifiers, Is the number of possible RFR values, Is a division parameter to adjust the class difference of access delay time. 8. The method as claimed in claim 7, wherein the resource for the reverse channel is allocated in consideration of a load of a system and parameters provided from the mobile terminal. In a mobile communication system comprising a base station and a plurality of mobile terminals located in the base station, a method for allocating a reverse channel for the mobile terminals, Requesting that a mobile station having the highest priority among all priorities that can be given to a mobile station to which a reverse channel is allocated in the base station is entitled to request resource allocation for the reverse channel Process, When the base station receives an entitlement request from the mobile station, granting the mobile station a qualification to request allocation of resources for the reverse channel; Requesting resource allocation for the reverse channel by the mobile station having the highest priority and the qualified mobile station; When the base station receives a resource allocation request from the mobile station having the highest priority and the qualified mobile terminal, allocating a resource for the reverse channel; Wherein the resource for the reverse channel is allocated by contention between the mobile terminal having the highest priority and the qualified mobile terminal. 16. The mobile station of claim 15, wherein the mobile station having the highest priority transmits an entitlement request message to the base station, the entitlement request message including a temporary identifier identifying the priority and the mobile station having the same priority. And requesting to grant the right to request the allocation of resources to the channel. The method of claim 15, wherein the qualifying process comprises: Determining a mobile terminal to be qualified from among mobile terminals which received the entitlement request message in consideration of the load of the system and the capacity of the current system; Setting a maximum value of RFR values including priority and temporary identifiers of entitlement request messages received from the qualified mobile terminals as an entitlement identifier; And sending an entitlement message including the entitlement identifier to the entitled mobile terminals. 18. The method as claimed in claim 17, further comprising transmitting feedback information indicating whether the entitlement request message has been received for each resource used by the mobile terminal receiving the entitlement request message. 16. The method of claim 15, wherein the maximum number of mobile terminals to which the qualification is to be made ( ) Is determined by Equation 6 below. here, Is the number of resources for the resource allocation request, Is Load of mobile stations with the highest predicted priority in the first frame, Is a differentiation parameter that determines how much the initial access delay time of mobile stations with the highest priority can be guaranteed. 20. The method as claimed in claim 19, wherein success information about the number of mobile terminals determined by Equation (7) is set as feedback information and transmitted. here, Wow Is the number of entitlement assignment messages successfully sent by the mobile station. 21. The method of claim 20, further comprising: a reference value for qualifying mobile terminals that are not qualified by the feedback information. ) Is determined by Equation (8) and transmitted. here, Is the number of kinds of overall priority, Is the number of possible temporary identifiers, Is the number of possible RFR values, Is a division parameter to adjust the class difference of access delay time. The method as claimed in claim 15, wherein the resource for the reverse channel is allocated in consideration of a load of a system and parameters provided from the mobile terminal.