KR20050038978A - Method for controlling operational states of medium access control layer in mobile communication system using orthogonal frequency division multiple scheme - Google Patents

Abstract

The present invention has a media access control layer, wherein the media access control layer supports a null state for performing an initial operation according to a reset, an access state for performing reverse access, and a sleep state for receiving only system information and call information. A method of controlling an operation state of the media access control layer in a mobile communication system, the method comprising: transitioning from an access state to an active state when the reverse access is successful, and transmitting and receiving forward traffic and reverse traffic in the active state; Receiving the forward traffic according to a predetermined control when the reverse traffic transmission does not exist for a predetermined time period during the predetermined time period, and performing a state transition to a first hold state transmitting only a response signal for the forward traffic in the reverse direction And receiving the forward traffic under a predetermined control while receiving the forward traffic in the first hold state, and transitioning to a second hold state that does not transmit any signal in the reverse direction.

Description

METHOD FOR CONTROLLING OPERATIONAL STATES OF MEDIUM ACCESS CONTROL LAYER IN MOBILE COMMUNICATION SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLE SCHEME}

TECHNICAL FIELD The present invention relates to a mobile communication system, and more particularly, to a method of controlling an operation state of a media access control layer.

Since the cellular cellular mobile telecommunication system was developed in the United States in the late 1970s, AMPS (Advanced Mobile Phone Service), which is analogous to the first generation (1G) mobile communication system in Korea, has been developed. Began to provide voice communication services. Later, as a 2nd generation (2G) mobile communication system in the mid-1990s, a code division multiple access (CDMA) system was commercialized to provide voice and low-speed data services. Provided.

In addition, the International Mobile Telecommunication-2000 (IMT-2000), a 3rd generation (3G) mobile communication system that has been launched since the late 1990s, aims at improved wireless multimedia services, global roaming, and high-speed data services. Some commercialized services are in operation. In particular, the third generation mobile communication system has been developed to transmit data at higher speed as the amount of data serviced by the mobile communication system increases rapidly.

In addition, it is currently developing from a 3rd generation mobile communication system to a 4th generation (4G) mobile communication system. The fourth generation mobile communication system is not just a wireless communication service like the previous generation mobile communication systems, but has been standardized for efficient interworking and integration services between a wired communication network and a wireless communication network. Therefore, there is a demand for a technology for transmitting a large amount of data close to the capacity of a wired communication network in a wireless communication network.

As the mobile communication system develops, the service is developing from a voice service oriented service to a data service oriented service. Therefore, the mobile communication system is based on packet switching based on a circuit switching based network. It is evolving into a network. The packet switching system allocates channels only when there is data to transmit, so channel access and channel release operations occur frequently. Further, in the packet switched system, overall system efficiency depends on an operation method of a medium access control (MAC) layer that manages the channel access and channel release operations. do. The operation of the MAC layer will now be described.

The operation of the MAC layer is determined according to the connection state between the mobile station (MS) and the mobile communication system, and the operation of the MAC layer is different for each mobile communication system. First, the operation of the MAC layer of the second generation mobile communication system will be described with reference to FIG. 1.

1 is a diagram schematically illustrating operation states supported by a MAC layer in a typical second generation mobile communication system.

Referring to FIG. 1, first, in the second generation mobile communication system, the MAC layer supports two operational states, namely, an active state 111 and a dormant state 113. do. Here, the second generation mobile communication system may be, for example, a TIA / EIA-95-B system. The active state 111 has traffic such as traffic, for example, voice data, to the mobile communication terminal, and also has a downlink and uplink dedicated control channel (DCCH) for the mobile communication terminal. CHannel) and Dedicated Traffic Channel (DTCH) are allocated. The dormant state 113 represents a state in which the forward and reverse dedicated control channels do not exist, and a base station (BS) and a mobile switching center (MSC) resource do not exist. Point-to-Point Protocol (PPP) state is maintained, and a small data burst is present.

In the second generation mobile communication system, even when there is no data to be transmitted and received in the active state 111, the MAC layer continuously allocates dedicated channels, that is, a dedicated control channel and a dedicated traffic channel and bursts. It is not suitable for data services with characteristics. In this way, the number of active state mobile communication terminals that can be accommodated in a cell can be limited by allocating radio resources for dedicated channels to the mobile communication terminals even though there is no actual data to be transmitted and received. none. In addition, there is a problem that waste of radio resources and waste of power occur because mobile communication terminals maintain dedicated channels even though there is no data to actually transmit and receive.

In FIG. 1, the operation of the MAC layer of the second generation mobile communication system has been described. Next, operation states supported by the MAC layer in the third generation mobile communication system will be described with reference to FIG. 2.

2 is a diagram schematically illustrating operation states supported by a MAC layer in a typical third generation mobile communication system.

Referring to FIG. 2, first, in the third generation mobile communication system, the MAC layer includes an active state 211, a control hold state 213, and a suspended state ( 215 and four operating states of the dormant state 217. The third generation mobile communication system may be, for example, a code division multiple access (CDMA) 2000 system.

In the active state 211, traffic is transmitted to the mobile communication terminal in the same manner as the active state 111 described with reference to FIG. 1, and a forward and reverse dedicated control channel and a dedicated traffic channel are allocated to the mobile communication terminal. Indicates. The control maintenance state 213 performs power control (PC), indicates a state in which forward and reverse dedicated control channels are allocated, and traffic channel reassignment is possible at high speed. The pause state 215 is not assigned a forward and reverse dedicated control channel with the mobile communication terminal, and maintains a Radio Link Protocol (RLP) and a point-to-point protocol state, and a virtual active set. An active set is present and indicates a state having a slotted submode. The dormant state 217 is the same as the dormant state 113 described with reference to FIG. 1 and indicates that there is no forward and reverse dedicated control channels and no base station and mobile switch resources exist. The protocol state is maintained and a small burst of data is present.

In the 3rd generation mobile communication system, the MAC layer supports the above four operation states in consideration of data services other than voice services, thereby improving system overall performance by allocating radio resources only when there is data to be transmitted and received. . However, the MAC layer of the third generation mobile communication system, like the MAC layer of the second generation mobile communication system, also has states other than the active state 211, that is, the control maintenance state 213, the pause state 215 and the figure. In order to transition from the fragment state 217 to the active state 211, a contention-based random access procedure must be performed. When the contention-based random access procedure is performed, the state transition speed from other states to the active state 211 is slow, resulting in deterioration of overall system performance. Further, due to the nature of the logical channel structure, the number of mobile communication terminals having the control maintenance state 213 and the pause state 215 is limited, which is one of the main quality of service requirements of the mobile communication system. You have a structure that is not appropriate for always on '. In this case, the always on indicates a state in which a contention-free random access is possible instead of a contention-based random access while having forward and reverse dedicated channels even though it is in a state other than the active state.

The operating states of the second and third generation MAC layers have the following problems.

(1) Not suitable for 'always on'

(2) Long state transition time due to contention-based random access

(3) The number of mobile communication terminals that can be accommodated in each state of the MAC layer is limited.

(4) Inefficiency in terms of power saving

(5) Restriction of State Transition According to Mobile Terminal Request in Each State of MAC Layer

As described above, the MAC layer operating states proposed to date have a number of problems, and therefore, there is a need for operating states suitable for the MAC layer of the fourth generation mobile communication system, which is the next generation mobile communication system.

It is therefore an object of the present invention to provide a method for controlling the MAC layer operating states of a mobile communication system.

Another object of the present invention is to provide a method of controlling operating states to minimize power consumption in a MAC layer of a mobile communication system.

It is still another object of the present invention to provide a method of controlling operating states to provide a state transition according to a mobile communication terminal request in a MAC layer of a mobile communication system.

The present invention for achieving the above object; A mobile communication system having a media access control layer, wherein the media access control layer supports a null state for performing an initial operation according to a reset, an access state for performing reverse access, and a sleep state for receiving only system information and call information. A method of controlling an operation state of the medium access control layer in the method comprising: transitioning from an access state to an active state when the reverse access is successful, and presetting while transmitting and receiving forward and reverse traffic in the active state Receiving the forward traffic according to a predetermined control when the reverse traffic transmission does not exist for one set time, and performing a state transition to a first hold state transmitting only a response signal for the forward traffic in the reverse direction;In the first hold state it is characterized in that it comprises the step of receiving the forward traffic according to a predetermined control while receiving the forward traffic, and the transition to the second hold state does not transmit any signal in the reverse direction.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

FIG. 3 is a diagram schematically illustrating operation states supported by a medium access control (MAC) layer of a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 3, first, the MAC layer includes a null state 311, an access state 313, a sleep state 315, and an active state. 317, a first hold state 319, and a second hold state 321 are supported. Before describing the operating states of the MAC layer, downlink logical channels and uplink logical channels of the mobile communication system will be described.

First, forward logical channels of the mobile communication system will be described with reference to FIG. 4.

4 is a table illustrating types and roles of forward logical channels of a mobile communication system.

Referring to FIG. 4, the forward logical channel is classified into a control channel and a traffic channel. The control channel includes a broadcast channel (BCH), a paging channel (PCH: pH), and an access permission channel (AGCH). Grant CHannel, hereinafter referred to as 'AGCH'), Access Exchange Channel (AXCH: Access Exchange CHannel, hereinafter referred to as 'AXCH'), and Traffic Control Channel (TCCH), referred to as 'TCCH' And a state transition channel (hereinafter referred to as STCH) and a dedicated control channel (DCCH) (hereinafter referred to as DCCH). In addition, the traffic channel includes a traffic channel (TCH) (hereinafter referred to as TCH). The roles for each of the forward logical channels will now be described here.

(1) BCH

The BCH is used to transmit system information (SI), cell specific information, and the like, and the BCH signal is broadcasted throughout the cell.

(2) PCH

The PCH is used to transmit paging information.

(3) AGCH

The AGCH is used to transmit an ACK corresponding to a reverse access request received through an access channel (ACH: ACH). Here, since the ACH will be described below, a detailed description thereof will be omitted.

(4) AXCH

The AXCH is used for exchanging additional information with a mobile station (MS) after reverse access is successful.

(5) TCCH

The TCCH is used to transmit control information for assigning forward and reverse traffic channels, and is used to transmit ACK for reverse traffic.

(6) STCH

The STCH is used for transmitting a state transition command to the base station to cause the mobile communication terminal to transition from a state to which the mobile communication terminal currently belongs to another state.

(7) DCCH

The DCCH is a channel for transmitting control information for a specific mobile communication terminal. The DCCH is transmitted with only the specific mobile communication terminal as a target.

(8) TCH

The TCH is a channel carrying forward traffic, that is, forward data.

In FIG. 4, types and roles of forward logical channels are described. Next, types and roles of reverse logical channels will be described with reference to FIG. 5.

5 is a table illustrating types and roles of reverse logical channels of a mobile communication system.

Referring to FIG. 5, the reverse logical channel is also largely classified into a control channel and a traffic channel. The control channel includes an ACH, a DCCH, a dedicated ACK channel (hereinafter referred to as DACH), and a state transition request channel (SRCH). And a state transition ACK channel (state transition Ack CHannel, referred to as 'SACH'). The traffic channel may be a TCH or the like. The roles for each of the reverse logical channels will now be described.

(1) ACCH

The ACH is used by the mobile communication terminal to perform reverse access.

(2) DCCH

The DCCH is used for the mobile communication terminal to request a reverse TCH or to transmit channel quality information (CQI) for the forward channel, etc., and to transmit a reverse ACK in the active state 317.

(3) DACH

The DACH is used by the mobile communication terminal to transmit a reverse ACK in the first hold state 319.

(4) SRCH

The SRCH is a mobile communication terminal present in the first hold state 319 to make a state transition request to the base station in order to transition the state to which the mobile communication terminal itself belongs to another state. State transition to active state 317 is used to make a request.

(5) SACH

The SACH is used by the mobile communication terminal to transmit an ACK according to the state transition command of the base station.

(6) TCH

The TCH is used to transmit reverse traffic.

Next, each of the MAC layer operation states of FIG. 3 will be described.

First, the null state 311 will be described.

The null state 311 is a state in which an initial operation is performed as the mobile communication terminal is powered on, or as the subscriber station is reset due to an abnormal operation. That is, the null state 311 is a state in which all functions for the mobile communication terminal to perform actual communication are released, and no forward logical channel or reverse logical channel is assigned.

Secondly, the access state 313 will be described.

The access state 313 represents a random access state for reverse access, and in the access state 313, the mobile communication terminal uses a contention-based scheme through the ACH in a contention-based manner. Perform reverse access. On the other hand, for the reverse access of the mobile communication terminal, the base station transmits the ACK for the reverse access via the AGCH. When the reverse access is successful, the mobile communication state transitions from the access state 313 to the active state 317. When the reverse access fails in the access state 313, the mobile communication terminal transitions from the access state 313 to the sleep state 315.

Third, the sleep state 315 will be described.

The sleep state 315 is a state in which neither a forward traffic channel nor a reverse traffic channel is allocated, indicating that a base station (BS) and a mobile switching center (MSC) resource are not present. The Point-to-Point Protocol (PPP) state is maintained, and a small data burst is present. In the sleep state 315, the mobile communication terminal may respond to a call of the base station, and if it wants to transmit data to the base station, the state transitions to the access state 313. In addition, the sleep state 315 has no power control and timing control (no power and timing control), ultra-power saving mode (ultra power save mode), a state capable of supporting a plurality of mobile communication terminals Large number of mobiles supported.

Fourth, the active state 317 will be described.

The active state 317 transmits and receives traffic, has a reverse control channel in which all control information exists (full fledged uplink control channel), and provides sufficient quality of service (QoS). Indicates a state that can be supported (support rich QoS functionality). In other words, the active state 317 is allocated a forward or reverse traffic channel to transmit or receive actual data. In the active state 317, if necessary, all states except the access state 313, that is, the sleep state 315, the first hold state 319, and the second hold state 321 are transitioned to. It is possible. In the active state 317, the mobile communication terminal transmits an ACK for the forward traffic on the reverse DCCH. Meanwhile, the base station transmits an ACK for the reverse traffic transmitted by the mobile communication terminal through the TCCH.

Fifth, the first hold state 319 will be described.

In the first hold state 319, the mobile communication terminal can receive only data transmitted from the base station, and the mobile communication terminal transmits an ACK for the data received from the base station through the DACH. The mobile communication terminal present in the first hold state 319 requests a state transition to the base station through the SRCH in order to transmit data to the base station. Then, the base station detects the state transition request of the mobile communication terminal received through the SRCH, and corresponding to the state transition of the mobile communication terminal, ie, the active state 317, through the STCH or TCH corresponding to the state transition request. Command a state transition. The operation of instructing the state transition of the mobile communication terminal through the TCH will be described later, so the detailed description thereof will be omitted. As a result, the first hold state 319 is timing controlled, performs coarse power control, and fast state transitions to the active state 317 in a contention free manner. There is a reverse control channel capable of (contention-free, rapid transition to active state), only basic control information (thin uplink control channel), users can receive data traffic, power It is a power save mode.

Sixth, the second hold state 321 will be described.

In the second hold state 321, the mobile communication terminal can receive only data transmitted from the base station without transmitting any data in the reverse direction. That is, in the second hold state 321, the mobile communication terminal does not even transmit an ACK for the data received from the base station. However, the base station may request the mobile communication terminal present in the second hold state 321 to transmit the ACK for the forward traffic through the TCCH. Here, the base station allocates a DACH to which the mobile communication terminal transmits an ACK for the forward traffic together with the ACK transmission request for the forward traffic. The mobile communication terminal then transmits an ACK for the forward traffic on the DACH corresponding to the DACH information assigned to the mobile communication terminal itself received on the TCCH. After the mobile communication terminal transmits an ACK for the forward traffic, the DACH allocated to the mobile communication terminal is deallocated.

In addition, the mobile communication terminal may transition from the second hold state 321 to the first hold state 319 according to a command of the base station. Here, a state transition command from the second hold state 321 to the first hold state 319 is transmitted through a TCH, and the first hold in the second hold state 321 of the mobile communication terminal through the TCH. The operation of instructing the state transition to the state 319 will be described later, so the detailed description thereof will be omitted. In order for the mobile communication terminal existing in the second hold state 321 to transmit reverse data, a state transition from the second hold state 321 to the access state 313 is required.

Next, logical channels assignable to each of the operation states of the MAC layer will be described with reference to FIG. 6.

FIG. 6 is a diagram schematically illustrating a table capable of assigning logical channels corresponding to the MAC operation states of FIG. 3.

6, the null state 311, the access state 313, the sleep state 315, the active state 317, the first hold state 319, and the second hold state 321, respectively. The logical channels assignable at are shown. In this case, logical channels allocable in the respective operation states are described as follows.

First, in the null state 311 no forward logical channel and no reverse logical channel are assigned. Second, in the access state 313, BCH, AGCH, and AXCH may be allocated as forward logical channels, and ACH may be allocated as a reverse logical channel. Third, in the sleep state 315, BCH and PCH may be allocated as forward logical channels, and no reverse logical channel is allocated. Fourth, in the active state 317, BCH, TCCH, STCH, DCCH, and TCH may be allocated as forward logical channels, and DCCH, SACH, and TCH may be allocated as reverse logical channels. Fifth, in the first hold state 319, BCH, TCCH, STCH, and TCH may be allocated to forward logical channels, and DACH, SRCH, and SACH may be allocated to reverse logical channels. Sixth, in the second hold state 321, BCH, TCCH, and TCH may be allocated as forward logical channels, and ACH may be allocated as a reverse logical channel.

As shown in FIG. 6, in the active state 317, both forward and reverse DCCHs and TCHs are allocated, and in the first hold state 319, the mobile communication terminal receives only forward data and receives reverse data. In order to transmit, the state transition is requested using the SRCH, and the base station instructs the state transition through the STCH to make the state transition to the active state 317. Further, in the second hold state 321, when the mobile communication terminal receives only forward data without a separate reverse ACK transmission and the base station wants to receive an ACK for the forward data, the second hold state 321 transmits an ACK transmission on the forward data through the TCCH. In this case, the mobile communication terminal temporarily receives a DACH and transmits an ACK for the forward data.

Next, an operation process of the base station and the mobile communication terminal in the second hold state 321 of FIG. 2 will be described with reference to FIG. 7.

7 is a signal flow diagram illustrating an operation process of a base station and a mobile communication terminal in the second hold state 321 of FIG.

Referring to FIG. 7, the base station first transmits data to the mobile communication terminal through the TCH (step 711). As described above, in the second hold state 321, the mobile communication terminal may receive data from the base station, but does not transmit any data in the reverse direction, and thus does not transmit an ACK for the data received through the TCH. . However, when the base station wants to receive an ACK for the data transmitted through the TCH, the base station transmits data to the mobile communication terminal through the TCH (step 713), and then sends an ACK request through the TCCH, The mobile communication terminal transmits DACH allocation information for transmitting an ACK for the data (step 715). In step 717, the mobile communication terminal receiving the ACK transmission request and the DACH allocation information through the TCCH transmits an ACK for the data received through the TCH through the DACH corresponding to the allocation information. Here, the DACH allocated to the mobile communication terminal is deallocated after the mobile communication terminal transmits the ACK.

In FIG. 7, an operation process of the base station and the mobile communication terminal in the second hold state 321 is described. Next, the base station and the mobile communication terminal in the first hold state 319 of FIG. 2 are described with reference to FIG. 8. The operation process of the will be described.

8 is a signal flow diagram illustrating an operation process of a base station and a mobile communication terminal in the first hold state 319 of FIG.

Referring to FIG. 8, first, the base station transmits data to the mobile communication terminal through the TCH (step 811). The mobile communication terminal receiving the data from the base station transmits an ACK for the received data through the DACH (step 813). As described above, in the first hold state 319, the mobile communication terminal can transmit only an ACK for data received through the DACH, so that there is a limit to reverse transmission. Therefore, when the mobile communication terminal generates data to be transmitted in the reverse direction in the first hold state 319, the mobile communication terminal transitions to the base station via SRCH, that is, the active state in the first hold state 319. A state transition to 317 is requested (step 815).

In operation 817, the base station which senses the state transition request of the mobile communication terminal through the SRCH commands the mobile terminal through the STCH or TCH. The mobile communication terminal then transitions from the first hold state 319 to the active state 317 according to the state transition command received through the SRCH or TCH and then corresponds to the ACK corresponding to the state transition command through the SACH. (Step 819). The base station may command the state transition not only through the STCH but also through the TCH, and the state transition command through the TCH is performed using a state transition message. Here, the state transition message has a data packet structure, and the state transition message will be described with reference to FIG. 9.

9 is a diagram illustrating a state transition message format according to an embodiment of the present invention.

9, in the active state 317 or the first hold state 319, the base station may transmit a state transition command to the mobile communication terminal through the STCH. In addition, in the active state 317, the first hold state 319, or the second hold state 321, the base station may transmit a state transition command to the mobile communication terminal through the TCH. The state transition message shown in FIG. 9 is used only when a state transition command is made through the TCH, and is transmitted through a data packet of the TCH. In addition, the state transition message shown in FIG. 9 may be used as a message for the base station to command a state transition to the mobile communication terminal, or may be used as a message for the mobile communication terminal to request a state transition to the base station.

Referring to FIG. 9, first, the state transition message includes a header area 900 and a payload area 950. A state transition indicator 910 is included in the header area 900. When the state transition indicator 910 is set to a preset value, the mobile communication terminal transmits a state transition command or state. The transition will detect the demand. For example, when the state transition indicator 910 is configured as 1 bit, when the state transition indicator 910 is set to '1', a state transition command or a state transition request may be detected.

Meanwhile, in the state transition command message of FIG. 9, the case where only the state transition indicator 910 exists in the header area 900 has been described. However, the state transition message may include state information that the mobile communication terminal should transition to. This will be described with reference to FIG. 10.

10 is a diagram schematically showing another state transition message format according to an embodiment of the present invention.

Referring to FIG. 10, first, the state transition command message includes a header area 900 and a payload area 950. The header area 900 includes a state transition indicator 910 and a transition state indicator 1000. When the state transition indicator 910 is set to a preset value as described above with reference to FIG. A transition command or state transition request is detected. In addition, the state transition indicator 910 is set to '1' and a value indicating a state to which the mobile communication terminal should transition is set in the transition state indicator 1000. For example, when the transition state indicator 1000 is configured with 3 bits, the transition state indicator 1000 may indicate a state to which the mobile communication terminal should transition according to the setting value of the 3 bits. That is, there are three states that can command the state transition: an active state 317, a first hold state 319, and a second hold state 321. The states transitionable from the active state 317 are the null state 311, the sleep state 315, the first hold state 319, the second hold state 321, and the first hold state 319. The states that can be transitioned from) are the null state 311, the sleep state 315, the active state 317, the second hold state 321, and the states that are transitionable from the second hold state 321 are null states. The state 311, the access state 313, the sleep state 315, and the first hold state 319. Thus, the transition state indicator 1000 should represent a total of six states, for example 000 is the null state 311, 001 is the access state 313, 010 is the sleep state 315, 011 Is the active state 317, 100 is the first hold state 319, and 101 is the second hold state 321.

Next, the state transition process according to the base station command will be described with reference to FIG. 11.

11 is a signal flow diagram illustrating a state transition process by a base station command according to an embodiment of the present invention.

Before describing FIG. 11, the base station may transmit a state transition command through the STCH to transition the state of the mobile communication terminal existing in the active state 317 or the first hold state 319. In addition, when a state of the mobile communication terminal existing in the active state 317, the first hold state 319, or the second state 321 is to be transitioned, a state transition command may be transmitted through the TCH. In the present invention, only the case where the base station commands the state transition by transmitting a state transition message through the TCH to the mobile communication terminal existing in the active state 317, the first hold state 319 or the second state 321. Let's do it.

Referring to FIG. 11, first, the base station issues a state transition command through the TCH to transition the state of the mobile communication terminal existing in the active state 317, the first hold state 319, or the second state 321. Transmit (step 1111). Here, the state transition command is transmitted through a state transition message as described with reference to FIG. As described with reference to FIG. 10, the state transition message includes a transition state indicator 1000 indicating a state to which the mobile communication terminal should transition. Thus, the mobile communication terminal itself receives the state transition message. You'll know the next state you need to transition to. Accordingly, the mobile communication terminal transitions to the state indicated by the transition state indicator 1000 according to the state transition message, and transmits an ACK for the state transition through the SACH (step 1113).

In FIG. 11, a state transition process according to a base station command is described. Next, a state transition process according to a mobile communication terminal request will be described with reference to FIG. 12.

12 is a signal flow diagram illustrating a state transition process due to a mobile communication terminal request according to an embodiment of the present invention.

12, the mobile communication terminal may transmit a state transition request through the SRCH when the mobile communication terminal exists in the first hold state 319, and the state transition through the TCH when the mobile communication terminal exists in the active state 317. The request can be sent. In the present invention, only the case where the base station requests a state transition by transmitting a state transition message through the TCH by the mobile communication terminal in the active state 317 will be described.

Referring to FIG. 12, first, a mobile communication terminal existing in the active state 317 transmits a state transition request through the TCH if it wants to transition the state (step 1211). It is assumed here that the state transition request is transmitted through a state transition message as described with reference to FIG. 10. As described with reference to FIG. 10, the state transition message includes a transition state indicator 1000 indicating a state to which the mobile communication terminal wants to transition from the active state 317. As the state transition message is received, the mobile communication terminal can know up to the next state to transition to.

Accordingly, the base station detects the state indicated by the transition state indicator 1000 according to the state transition message, sets the transition state indicator 1000 of the state transition message corresponding to the detected state, and then sets the TCH. Transmit via step 1213. After receiving the state transition message from the base station, the mobile terminal performs state transition to the state indicated by the transition state indicator 1000, and then transmits an ACK for the state transition through the SACH (step 1215).

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above has the advantage of improving system overall performance by adaptively controlling the operating states of the MAC layer in a mobile communication system. In addition, the present invention has the advantage of minimizing power consumption and maximizing resource efficiency by adaptively transitioning the operating states of the MAC layer to the state of a base station or mobile communication terminal.

1 is a diagram schematically illustrating operation states supported by a MAC layer in a typical second generation mobile communication system;

2 is a diagram schematically illustrating operation states supported by a MAC layer in a typical third generation mobile communication system;

3 is a diagram schematically illustrating operation states supported by a MAC layer of a mobile communication system according to an embodiment of the present invention;

4 is a table illustrating types and roles of forward logical channels of a mobile communication system.

5 is a table illustrating types and roles of reverse logical channels of a mobile communication system.

FIG. 6 is a diagram schematically illustrating a logical channel assignable corresponding to the MAC operation states of FIG. 3. FIG.

7 is a signal flow diagram illustrating an operation process of a base station and a mobile communication terminal in the second hold state 321 of FIG.

8 is a signal flow diagram illustrating an operation process of a base station and a mobile communication terminal in the first hold state 319 of FIG.

9 schematically illustrates a state transition message format according to an embodiment of the present invention.

10 is a schematic diagram illustrating another state transition message format according to an embodiment of the present invention.

11 is a signal flow diagram illustrating a state transition process by a base station command according to an embodiment of the present invention.

12 is a signal flow diagram illustrating a state transition process due to a mobile communication terminal request according to an embodiment of the present invention.

Claims (9)

A mobile communication system having a media access control layer, wherein the media access control layer supports a null state for performing an initial operation according to a reset, an access state for performing reverse access, and a sleep state for receiving only system information and call information. In the method for controlling the operation state of the media access control layer, A state transition from the access state to an active state if the reverse access is successful; If the reverse traffic transmission does not exist during a predetermined time while transmitting and receiving forward traffic and reverse traffic in the active state, the forward traffic is received according to a predetermined control, and a response signal for the forward traffic in the reverse direction. A state transition to the first hold state transmitting a bay, Receiving the forward traffic according to a predetermined control while receiving the forward traffic in the first hold state, and transitioning to a second hold state that does not transmit any signal in the reverse direction. . The method of claim 1, The state transition from the active state to the first hold state is a state transition from the active state to the first hold state when detecting a state transition command from the base station or a state transition request of the mobile communication terminal. Said method. The method of claim 2, The state transition command is detected by receiving a state transition message. The method of claim 3, And the state transition message is traffic including a state transition indicator indicating that the mobile communication terminal should transition to a state different from a state to which the mobile communication terminal currently belongs, and a transition state indicator indicating the state to which the mobile communication terminal should transition. The method of claim 4, wherein The state transition from the active state to the first hold state according to the state transition request detection of the mobile communication terminal itself; Transmitting the state transition message to the base station when detecting the state transition request of the mobile communication terminal; And a state transition to a state indicated in the state transition message when a state transition message is received from the base station corresponding to the state transition message. The method of claim 1, The state transition from the first hold state to the second hold state may be performed by detecting a state transition command from a base station or by detecting a state transition request of the mobile communication terminal itself from the first hold state to the second hold state. The method as described above. The method of claim 6, The state transition command is detected by receiving a state transition message. The method of claim 7, wherein And the state transition message is traffic including a state transition indicator indicating that the mobile communication terminal should transition to a state different from a state to which the mobile communication terminal currently belongs, and a transition state indicator indicating the state to which the mobile communication terminal should transition. The method of claim 8, The state transition from the first hold state to the second hold state according to the state transition request of the mobile communication terminal itself; Transmitting the state transition message to the base station when detecting the state transition request of the mobile communication terminal; And a state transition to a state indicated in the state transition message when a state transition message is received from the base station corresponding to the state transition message.