KR20050017600A - Apparatus and method for paging in wireless communication system - Google Patents

Abstract

PURPOSE: A device for paging in a wireless communication system and a method therefore are provided to enable a base station to determine whether to use an RSCM(Reduced Slot Cycle Mode) according to a degree of transmission interference, and to transmit a control message to a mobile station in order to control usage of the RSCM, thereby optimally performing a paging scheduling process. CONSTITUTION: A traffic monitor(260) monitors traffic statistical values for mobile stations. An RSC(Reduced Slot Cycle) controller(270) selects a mobile station which disables an RSCM if the traffic statistical values exceed a preset threshold value, and generates the first control message for disabling the RSCM to the selected mobile station, and then transmits the generated first control message. The traffic statistical values refer to the number of the mobile stations operating with the RSCM.

Description

Apparatus and method for paging in a wireless communication system {APPARATUS AND METHOD FOR PAGING IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for paging in a wireless communication system, and more particularly, to an apparatus and method for controlling a paging cycle when using a slot cycle mode (SCM) in a wireless communication system.

In modern society, wireless communication systems exist everywhere. Operators and consumers use a wide range of fixed and mobile wireless terminals, such as cell phones, pagers, personal communication services (PCS) systems, and fixed wireless access devices such as vending machines with cell phone capabilities. . Wireless service providers continue to strive to open new markets for wireless devices and seek to expand the existing market by making wireless devices and services cheaper and more reliable. In addition, the price of such wireless devices has been low enough for almost everyone to buy. Wireless service providers offer new services to continue attracting new customers to the market. For example, we implement services such as digital data services that allow users or subscribers to browse the Internet and send and receive email.

In general, mobile stations, such as cell phones, PCS handsets, portable computers, telemetry devices, etc., are often operated by an external power source connected to the mobile station. This is because when the internal battery of the mobile station is used without using an external power source, the capacity of the battery is limited and thus the use thereof is limited. Thus, a mobile station capable of operating the battery for extended periods of time to provide enhanced value to the user can provide a competitive advantage to service providers and equipment companies.

The duration of this mobile station battery operation can be extended by lowering power consumption in the idle state, i.e. when not transmitting voice or data communications. The mobile station may enable one or more components for power saving when in the idle state. For example, the mobile station can reduce the amount of power required for idle state operation by disabling the transmitter while in the idle state. In addition, the mobile station can lower idle state power requirements by enabling the slotted operation mode with the base station.

The mobile station enters the idle state when it is turned on and is synchronized with the system and has no ongoing cells. The mobile station continues to receive the paging channel for information while in the idle state. This information includes overhead messages such as system parameter messages and messages addressed directly from the base station to the mobile station.

The mobile station may communicate with the base station in an unslotted mode or a slotted mode while in an idle state. A typical paging channel slot is an 80-millisecond time slot within a paging slot cycle. Paging slot cycles range from 16 time slots (1.28 seconds) to 2048 time slots (163.84 seconds). The mobile station monitors all paging channel slots to receive messages from the base station in the unslotted mode. In addition, the mobile station monitors only selected subsets of paging channel slots to receive messages from the base station in slotted mode. During times when the mobile station does not monitor the selected subset of paging channel slots, the power of the mobile station RF receiver is turned off to save additional power. In this slotted mode of operation, the battery supply operating life is long because the receiver of the mobile station consumes power only during the selected slot cycle, not the entire paging cycle.

In early wireless communication systems, such as cdma2000 release B (ie IS-2000-B), the mobile station had to select an overall slot cycle index r between 0 and 7 (ie 000-111). The slot cycle index r gives the period P of the slotted operating mode according to the following equation.

P = (2) ^r x 1.28 seconds

Therefore, if the total slot cycle index r is zero, the period P of the slotted mode is 1.28 seconds. If the total slot cycle index r is 7, then the period of the slotted mode is 163.84 seconds.

However, newer generations of wireless mobile stations, especially cell phones and other mobile stations, include new features and applications that require very fast messaging. Many of these new features cannot operate in full cycle slotting mode beyond 1.28 seconds. For example, Palm Pilot supports interactive gaming applications that allow a user of one mobile station to enjoy playing with a user of another mobile station. However, gaming applications that require fast, real-time conversations cannot operate properly in slotted mode with a minimum period of 1.28 seconds.

In addition, push-to-talk services, such as the Direct Connect ^SM service provided by Nextel, may not work properly in full cycle slotting mode operation. This push-to-talk service is a service in which two mobile stations behave like walkie-talkies. That is, after a call connection is established between the first mobile station and the second mobile station, the two mobile stations enter an idle state after the call connection is established. If, at a certain time, the user of the first mobile station presses a button on the first mobile station, "Hey, what are you trying to do?" The user of the second mobile station should be able to immediately hear and respond to the voice message as described above. However, such push-to-talk applications cannot operate properly in slotted mode with a minimum period of 1.28 seconds.

The latest generation of mobile stations can enter RSCM or negative slot cycle mode when in the slotted mode of operation to provide gaming applications and push-to-talk services that require fast messaging as described above.

In RSCM, the mobile station selects an RSC index r between -4 and 7. As described above, the slot cycle index r gives the period P of the slotted operation mode according to the following equation.

P = (2) ^r x 1.28 seconds

Since the slot cycle index r can have a negative value, slot cycle periods of less than 1.28 seconds are possible. For example, if the RSC index r is -4, the RSC period in the slotted mode is 80 milliseconds. If the RSC index r is -3, the RSC period in the slotted mode is 160 milliseconds. If the RSC index is -2, the RSC period of the slotted mode is 320 milliseconds, calculated in this manner.

However, when a large number of mobile stations use RSCM extensively, serious scheduling problems occur at the base station. The base station can flexibly schedule transmission of a paging message to nearby mobile stations when the paging slot cycles are greater than 1.28 seconds. However, if the slot cycles are only 80 milliseconds long, the base station will not be able to schedule the transmission in an optimal manner. Thus, the benefits arising from using RSCM are reduced in certain heavily loaded conditions.

In addition, certain applications, such as Quick CHAT (QCHAT), may require mobile stations in the first group to monitor the paging channel of the base station more frequently than mobile stations in the second group. Continuous operation of the second group mobile stations in RSCM will unnecessarily drain the batteries of the second group mobile stations, reducing the life of the battery. However, operating the first group of mobile stations in normal operating mode rather than RSCM has a negative impact on application performance.

Therefore, there is a need in the art for an improved system and method for enabling the use of different RSCI values in a wireless communication system.

Accordingly, an object of the present invention is to provide an apparatus and method for enabling or disabling RSCM for a paging channel in a wireless communication system.

It is another object of the present invention to provide an apparatus and method for controlling RSC when it is used in a traffic condition under which many mobile stations perform RSCM for network performance.

Another object of the present invention is to provide an apparatus and method for selecting an RSCI value suitable for each of mobile stations performing different applications.

According to the present invention, a base station apparatus for controlling a reduced slot cycle mode (RSCM) operation of mobile stations in a wireless communication system, comprising: a traffic monitor for monitoring traffic statistics for the mobile stations; A reduced slot cycle (RSC) controller that selects one of the mobile stations to disable RSCM when the threshold value is exceeded, and generates and transmits a first control message for disabling RSCM to the selected mobile station; Characterized in that.

According to the present invention, a base station apparatus for controlling RSCM operation of mobile stations in a wireless communication system, the base station apparatus comprising: a service monitor for monitoring a quality of service provided to the mobile stations, and the mobile station according to the quality of service of each monitored mobile station; And an RSC controller for matching a preset Slot Cycle Index (RSCI) value to each group, and transmitting a release order message including the matched RSCI value to each of the mobile stations. .

According to the present invention, there is provided a method for controlling a reduced slot cycle mode (RSCM) operation of mobile stations in a base station apparatus of a wireless communication system, comprising: a first process of monitoring, by the base station apparatus, the number of mobile stations operating with the RSCM; Selecting a mobile station to disable RSCM among the mobile stations when the traffic statistics value exceeds a preset threshold, generating a first control message for disabling RSCM to the selected mobile station, and then controlling the traffic statistics to be transmitted; It is characterized by including two processes.

According to the present invention, a method for controlling the RSCM operation in a base station apparatus for controlling the reduced slot cycle mode (RSCM) operation of one or more mobile stations in a wireless communication system, the process of monitoring a service provided to the mobile stations And grouping the mobile stations according to the quality of service of the monitored mobile stations, matching preset RSCI values for each group, and sending a release order message including the matched RSCI values to each of the mobile stations. It characterized in that it comprises a process.

According to the present invention, a method for controlling RSCM operation in a mobile station apparatus having a memory storing RSCI values that can be supported by one or more terminals, the method comprising: receiving a release order message including an RSCI value from a base station; If the RSCI value in the received release order message matches at least one of the stored RSCI values, transmitting a response message including the RSCI value received from the base station to the base station and controlling the RSCM operation with the RSCI value. Characterized in that it comprises a.

Before the following detailed description of the invention, it may be advantageous to define certain words and phrases used throughout this specification. The terms "comprises" and "compounds" and their derivatives refer to inclusions without limiting meaning; The term “or” is inclusive and means “and / or”; The phrases “associated with” and “associated with” and derivatives thereof include, are contained within, linked to, contains, contains, contains within, is linked to, At or in conjunction with, communicate with, cooperate with, interleave with, adjoin, border with, have or have characteristics of, Mean; The term "controller" means a particular device, system or part thereof that can be implemented in hardware, firmware or software, or in certain combinations of two or more thereof, while controlling one or more operations. The functions associated with a particular particular controller may be centralized or distributed, either locally or remotely. With respect to the definitions of specific terms and phrases, one of ordinary skill in the art, in most cases, if not most of the time, the past and future use of terms and phrases in which such definitions are so defined. It can be understood that this applies to.

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

The present invention is for the base station to control the RSCM of the mobile station in a wireless communication system. In this way, the base station looks at two embodiments for controlling the RSCM of the mobile station.

In the first embodiment, the base station controls RSCM usage by determining whether RSCM is used and transmitting an overhead message including a flag indicating the RSCM to the mobile station. Then, in the second embodiment, the base station controls to change the RSCI of each corresponding mobile station using the release order message.

First, a general wireless communication system to which the above two embodiments are applied will be described.

1 illustrates an exemplary wireless communication system 100 in accordance with an embodiment of the present invention. The wireless communication system 100 is composed of a plurality of cell areas 121-123, each cell area including one of the base stations BSs 101, 102 or 103. The base stations 101-103 communicate with multiple mobile stations (MSs) 111-114, for example, via code division multiple access (CDMA) channels according to the IS-2000-C standard (ie, release C of cdma2000). do. Mobile stations 111-114 may receive data communications and / or voice communications simultaneously on two or more CDMA channels. Mobile stations 111-114 may communicate with base stations 101-103 via wireless links. Such mobile stations may be certain wireless devices such as conventional cell phones, PCS handsets, personal digital assistants (PDAs), portable computers, and telemetry devices.

The present invention is not limited to portable devices and encompasses other forms of radio access mobile stations, including fixed wireless mobile stations. In addition, in the present invention, only portable mobile stations are shown and described below. However, as used in the claims and the following description, it is intended that the term "mobile station" encompass both cell phones, portable devices such as wireless laptops, and stationary wireless mobile stations such as machine monitors having wireless capabilities.

The dotted line indicates the approximate boundary of the cell area 121-123 where the base stations 101-103 are located. The cell area is shown in a circle for convenience of description. The cell region may of course have an irregular shape depending on cell components and natural and artificial obstacles.

In addition, each cell area 121-123 is composed of a plurality of sectors, and a directional antenna coupled to the base station illuminates each sector. Although the base station is shown in the center of the cell in FIG. 1, the directional antennas may be located at the corners of the sectors. The system of the present invention is not limited to any particular cell region configuration.

In an embodiment of the invention, each base station (BS) 101, 102, and 103 is comprised of a base station controller (BSC) and one or more base station transceiver subsystems (BTSs). Such base station controllers and base station transceiver subsystems are known to those skilled in the art. A base station controller is a device that manages wireless communication resources, such as a base station transceiver subsystem, for a particular cell within a wireless communication network. The base station transceiver subsystem consists of RF transceivers, antennas, and other electrical devices located within each cell area. Such electrical devices include air conditioning units, heating units, electrical supplies, telephone line interfaces and RF transmitters and RF receivers. In order to simplify the operation of the present invention, the base station transceiver subsystems in each cell area 121, 122, and 123 and the base station controller associated with each base station transceiver subsystem are combined to provide a base station 101, a base station 102, and a base station. Represented by 103.

Base stations 101, 102, and 103 communicate voice and data signals with each other and through a public switched telephone network (PSTN) via communication line 131 and mobile switching center (MSC) 140. No). In addition, the base stations 101, 102, 103 exchange data signals, such as packet data, with the Internet (not shown) through the communication line 131 and the packet data server node (PDSN) 150. A packet control function (PCF) unit 190 controls the flow of data packets between the base stations 101-103 and the PDSN 150. PCF unit 190 may be implemented as part of PDSN 150, part of MSC 140, or as a stand-alone device in communication with PDSN 150 as shown in FIG. 1. The communication line 131 is provided between the MSC 140 and the base stations 101, 102, 103, and provides a connection path of control signals for establishing a connection of voice and data circuits between the MSC 140 and the base stations 101, 102, 103.

The communication line 131 may be a connecting means such as a T1 line, a T3 line, an optical fiber link, a network packet data backbone connection, or certain other types of data connections. The communication line 131 links each vocoder in the BSC with the switching elements in the MSC 140. Connections on the communication line 131 may transmit analog voice signals or digital voice signals in pulse code modulation (PCM) format, Internet protocol (IP) format, asynchronous transmission mode (ATM) format, and the like.

MSC 140 provides service and coordination functions between wireless networks and external network subscribers such as PSTNs or the Internet. In an embodiment of the present invention, the communication line 131 may be various data links, in which case each data link couples one of the base stations 101, 102, 103 to the MSC 140.

In a typical wireless communication system 100, mobile station 111 is located within cell area 121 to communicate with base station 101, and mobile station 113 is located within cell area 122 to communicate with base station 102. do. Mobile station 114 is also located within cell area 123 and communicates with base station 103. And, the mobile station 112 is located adjacent to the cell area 123 and indicates that the mobile station 112 is moving in the direction of the cell area 123 as indicated by the direction arrow close to the mobile station 112. Hand-off occurs as the mobile station 112 moves away from the cell region 121 to the cell region 123 at a particular point in time.

In the wireless communication system 100 configured as described above, mobile stations according to the first embodiment of the present invention operate in RSCM (also called negative slot cycle operation mode). The base stations 101-103 enable or disable RSCM operation of all mobile stations 111-114 or some of them in order to prevent the best paging message scheduling interference due to the use of RSCM. These base stations 101-103 enable or disable RSCM by setting a flag indicator on a selected traffic channel or overhead channel, for example, a paging channel. As such, when the base station according to the first embodiment of the present invention reaches a predetermined threshold level of mobile station traffic, the base station sets a flag indicator for turning off the RSCM. This prevents the mobile station from operating with RSCM.

As described above, in the first embodiment of the present invention, the base station determines whether the mobile station uses RSCM and transmits an overhead message including a flag indicating the mobile station to the corresponding mobile station to control the use of RS C M.

Then, the operation of the base station and the mobile station in the wireless communication system 100 according to the second embodiment will now be described. Mobile stations according to a second embodiment of the present invention operate in RSCM (also called negative slot cycle mode of operation). However, in order to use different optimal RSCI values for each mobile station 112-114, the base stations 101-103 and the mobile stations 112-114 have an optimal RSCI value for each mobile station 112-114. Select.

As described above, in the second embodiment of the present invention, the base station can select an optimal RSCI value for each mobile station when RSCM is used to perform RSCM operation with an RSCI value suitable for each mobile station.

2 illustrates in detail an exemplary base station 101 in accordance with an embodiment of the present invention. Base station 101 consists of a base station controller (BSC) 210 and a base station transceiver subsystem (BTS) 220. Since the base station controllers and the base station transceiver subsystems are the same as in FIG. 1 above, description thereof will be omitted. The BSC 210 including the BTS 220 manages the resources in the cell area 121. The BTS 220 includes a BTS controller 225, a channel controller 235, a transceiver interface (IF) 245, an RF transceiver unit 250, and an antenna array 255. The BTS controller 225 controls the operation of the channel controller 235, which includes a number of channel elements, such as channel element 240, which performs bidirectional communication between forward and reverse channels. do. The forward channel refers to the channel through which signals are transmitted from the base station to the mobile station, and the reverse channel refers to the channel through which signals are transmitted from the mobile station to the base station. In an embodiment of the present invention, the channel elements communicate with base stations in cell 121 according to a code division multiple access (CDMA) protocol. The transceiver IF 245 transmits bidirectional channel signals between the channel controller 240 and the RF transceiver unit 250.

Antenna array 255 transmits forward channel signals received from RF transceiver unit 250 to mobile stations within the coverage area of base station 101. The antenna array 255 also transmits the reverse channel signals received from the mobile stations to the transceiver 250 within the effective range of the base station 101. In the present invention, the antenna array 255 is a multi-sector antenna, such as a three sector antenna, in which each sector array is responsible for transmitting and receiving functions within 120 ° arc of the effective range. Additionally, the RF transceiver unit 250 may include an antenna selection unit for selecting a specific antenna among different antennas in the antenna array 255 during the transmission and reception operation.

First, a base station operating according to the first embodiment of the present invention will be described. The monitor 260 illustrated in FIG. 2 may be a traffic monitor for monitoring traffic or a service monitor for monitoring a service. In the first embodiment of the present invention, it is assumed that the monitor 260 is a traffic monitor.

According to the first embodiment of the present invention, the traffic monitor 260 and the slot period controller (RSCC) 270 may restrict the use of RSCMs of the mobile stations 111-114. Here, the traffic monitor 260 according to the first embodiment is connected to the BTS controller 225, and the number of mobile stations processed by the base station 101, the traffic amount of voice and data, and the number of mobile stations operating in RSCM are described. Watch. RSC control unit 270 receives monitored traffic statistics from traffic monitor 260 and compares the traffic statistics with one or more predetermined threshold parameters. If the RSC controller 270 is determined to interfere with optimal paging message scheduling in the paging channel due to the traffic load processed by the base station 101, then the RSC controller 270 may indicate that the BTS 225 is an overhead channel example. For example, limiting RSCM usage by having a control message including a flag indicator sent to a paging channel or a selected traffic channel.

According to the first embodiment of the present invention, the base station 101 transmits an RSCM to an overhead message such as a system parameter message, an extended system parameter message or a traffic channel message such as ITSPM, UHDM, and GHDM. Add a flag to indicate usage. Even if the mobile station advertises to the base station 101 that the mobile station support this capability, the base station 101 ignores the mobile station's capability and the mobile station is in the normal slot period mode (or full). slot cycle mode).

In addition, according to the first embodiment of the present invention, the base station 101 initially indicates in the overhead message to perform RSCM by enabling the flag indicator. Thus, the mobile station may initially invoke the RSCI feature. Thereafter, the base station 101 schedules the transmission of the message through the paging channel according to the assigned slot cycle index (SCI). If the number of mobile stations exceeds a preset threshold, the base station 101 disables the flag indicator. The base station then operates in full slot cycle mode (FSCM) for other mobile stations. By doing so, the present invention can reduce the load due to the use of RSCM.

According to the first embodiment of the present invention, the base station 101 may selectively limit the use of RSCM operation of individual mobile stations without limiting the use of RSCM operation for new mobile stations or all existing mobile stations. To do so, RSC controller 270 sends each traffic channel message, e.g., ITSPM, UHDM, GHDM, with flag indicator disabled to BTS controller 225 to target mobile station. When the target mobile station receives the traffic channel message, it detects that the flag indicator is disabled, and then performs a full slot cycle mode.

In addition, such RSC controller 270 can flexibly restrict the use of RSCM to disable RSCM of each mobile station. The flag indicator may be set by features such as quality of service (QoS), priority of the mobile station (eg, high paging users). As such, while the existing mobile station continues to use RSCM, base station 101 may use a system parameter control message to limit RSCM usage of new mobile stations entering the coverage area of base station 101. In addition, the base station 101 may use a system parameter control message or a traffic channel control message to limit the RSCM usage of the selected existing mobile station while other existing mobile stations continue to use RSCM.

In FIG. 2, RSC controller 270 and traffic monitor 260 are associated with base station transceiver subsystem 220. This configuration is merely exemplary and should not be construed as limiting the scope of the present invention. RSC controller 270 and service monitor 260 may be associated with base station controller 210. In another embodiment, another embodiment, RSC controller 270 and service monitor 260 may be associated with both BTS 220 and BSC 210. Traffic monitor 260 monitors the traffic load of one or more base station transmit / receive subsystems associated with BSC 210. In addition, RSC controller 270 may be configured to send an overhead channel message, e.g., a system parameter message, an extended system parameter message or a traffic channel message, e.g., ITSPM, HUDM, GHDM Allow to transmit.

In addition, in the present invention, RSC controller 270 need not set a predetermined threshold to limit the use of a particular algorithm or RSCM. In fact, such an algorithm or predetermined threshold may vary depending on the environment of each base station operation and the physical capabilities of each base station.

Next, a base station operating according to the second embodiment of the present invention will be described. Hereinafter, it is assumed that the monitor 260 illustrated in FIG. 2 is a service monitor 260 according to the second embodiment of the present invention.

According to the second embodiment of the present invention, the base station 101 may selectively assign different RSCIs to specific mobile stations, such that mobile stations in the same cell may operate at different optimal slot cycle ratios. To this end, service monitor 260 receives from MSC 140 service information regarding the type of service provided by BTS controller 225 to each mobile station processed by base station 101. For example, the service type may include normal communication services, gaming services, push-to-talk services, QCHAT services, or some other form of communication service that do not need to operate with RSCI. The service monitor 260 also monitors RSCI values for each mobile station operating in RSCM. In other words, monitoring the service type in the service monitor 260 means monitoring the allowable delay rate, the minimum required transmission rate, and the statistical traffic amount, that is, the quality of service (Qos) of the mobile station. Hereinafter, monitoring the service type in the service monitor 260 will be described with the same meaning as monitoring the service quality.

The reduced slot cycle (RSC) controller 270 receives service information from the service monitor 260. RSC controller 270 also transmits a release order message with different RSCI values to one or more target mobile stations by BTS controller 225 over a particular call channel. RSC controller 270 selects an RSCI value for that particular mobile station according to the service information of that particular mobile station.

When each target mobile station receives a release order message, each target mobile station operates in the assigned RSCM as much as possible. The base station 101 then schedules the transmission of the message in the paging channel according to the assigned RSCI.

3 illustrates a wireless mobile station 111 according to an embodiment of the present invention. The wireless mobile station 111 is composed of an antenna 305, a radio frequency (RF) transceiver 310, a transmitter (TX) processing circuit 315, a microphone 320, and a receiver (RX) processing circuit 325. In addition, the wireless mobile station 111 may include a speaker 330, a main processor 340, an input / output (I / O) interface (IF) 345, a keypad 350, a display 355, and a memory 360. Equipped. The memory 360 is comprised of a basic operating system (OS) program 361, a slotting mode control algorithm 370, and an RSC flag / RSCI field 380. Here, it is assumed that the RSC flag / RSCI field 380 is used as an RSC flag in the first embodiment and an RSCI field in the second embodiment.

The high frequency (RF) transceiver 310 receives an input RF signal transmitted by the base station from the antenna 305. The high frequency (RF) transceiver 310 down-converts the input RF signal to produce an intermediate frequency (IF) or baseband signal. The IF or baseband signal converted as described above is transmitted to the receiver (RX) processing circuit 325, and the receiver (RX) processing circuit 325 is processed baseband by filtering, decoding and / or digitizing the input signal. Generate a signal. The receiver (RX) processing circuit 325 sends the processed baseband signal to the speaker 330 as voice data, and to the main processor 340 for other processing, such as web browsing.

Transmitter (TX) processing circuit 315 receives analog or digital voice data from microphone 320 or other output baseband data such as web data, email, interactive video game data from main processor 340. Transmitter (TX) processing circuit 315 encodes, multiplexes, and digitizes the output baseband data to produce a processed baseband or IF signal. The high frequency (RF) transceiver 310 receives the processed output baseband or IF signal from the transmitter (TX) processing circuit 315. A high frequency (RF) transceiver 310 up-converts the baseband or IF signal to a high frequency (RF) signal, and the high frequency (RF) signal is transmitted through the antenna 305.

In an embodiment of the present invention, the main processor 340 is a microprocessor or a microcontroller. The memory 360 is connected to the main processor 340. According to an embodiment of the present invention, a portion of the memory 360 includes a random access memory (RAM), and a portion of the memory 360 includes a flash memory serving as a read-only memory (ROM).

The main processor 340 executes a basic operating system (OS) program 361 stored in the memory 360 to control the overall operation of the wireless mobile station 111. The main processor 340 controls the reception of forward channel signals and the transmission of reverse channel signals by the radio frequency (RF) transceiver 310, the receiver (RX) processing circuit 325, and the transmitter (TX) processing circuit 315. .

The main processor 340 may execute other processes and other programs in the memory 360. The main processor 340 may move data into or out of the memory 360 as requested by an executing process. The main processor 340 is connected to the I / O interface 345. I / O interface 345 allows mobile station 111 to be connected to other devices such as laptop computers and portable computers. I / O interface 345 becomes a communication path between the accessories and main controller 340.

The main processor 340 is connected to the keypad 350 and the display unit 355. The user of the mobile station 111 uses the keypad 350 to enter data into the mobile station 111. Display 355 may be a liquid crystal display capable of providing at least limited graphics from text or web sites. Display 355 may use other types of displays.

The base operating system 361 includes a slotted mode control algorithm 370. When the mobile station 111 enters the idle state, the main processor 340 may execute the slotted mode control algorithm 370. This enters the full slot cycle operation mode or RSCM. Slotted mode of operation algorithm 370 checks the value stored in RSCI field 380 to determine whether to operate in full slot cycle mode or RSCM.

The RSC flag field 380 according to the first embodiment of the present invention stores a value of a flag indicator of an overhead channel message or a traffic channel message transmitted from the base station 101.

In addition, the RSCI field 380 according to the second embodiment of the present invention stores a value of RSCI in a release order message transmitted from the base station 101. In particular, according to the second embodiment of the present invention, the RSCI field 380 stores one or more preferred, or supportable, RSCI values for the mobile station 111.

If the RSCI value received in the release order message from the base station 101 does not match one of the RSCI values stored in the RSCI field 380, then the slotted mode control algorithm 370 causes the mobile station 111 to release the release order message. The RSCI transmits a preferred RSCI value to the base station 101 as a response message. The response message may be a release order message or a confirmation message.

4 shows a state diagram 400 representing general logical states of the mobile station 112. First, when power-up 405 is reached, that is, when mobile station 112 is turned on, mobile station 112 enters initialization state 410. While in the initialization state 410, the mobile station 112 obtains network information such as SID, NID, etc. and system timing information such as slot cycle index value from the serving base station 101. Once the mobile station 112 has fully obtained network information and system timing information from the base station 101, the mobile station 112 enters an idle state 415.

While in idle state 415, mobile station 112 may communicate with base station 101 in an unslotted mode or a slotted mode. In the unslotted mode, mobile station 112 monitors all paging channel slots for messages from base station 101. In addition, in slotted mode, mobile station 112 monitors only the selected subset of paging channel slots for messages from base station 101 according to the SCI value (or RSCI value). Additional power is saved by turning off power at the mobile station RF receiver during times when the mobile station 112 does not monitor the selected subset of paging channel slots.

When the mobile station 112 receives a paging message or initiates or registers a call requesting confirmation or response, the mobile station 112 enters a system access state 420. While in the system access state, the base station 101 may assign the call channel to the mobile station 112 to cause the mobile station 112 to enter the call channel state 425. Call channel state 425 continues while assigning a call channel to mobile station 112.

When an application or service using the assigned call channel is terminated, for example, when the call is dropped, the base station 101 sends a release order message to the mobile station 112 causing the mobile station 112 to enter the initialization state 410 again. send. In addition, if there is no change while the serving base station is in the call channel state 425, that is, no intercell movement to another base station occurs, the base station 101 switches the mobile station 112 to the idle state 410 directly. A release order message is sent to the mobile station 112 for the purpose of doing so. The release order message includes the RSCI value being requested by the base station 101 for the mobile station 112 to operate.

Then, according to the first embodiment, a process of transmitting a control message including a flag indicating whether the base station determines whether the mobile station uses RSCM to the mobile station will be described with reference to FIG. 5.

5 is a flowchart 500 illustrating a process for controlling RSCM operation in the wireless communication system 100 according to the first embodiment of the present invention.

First, in step 505, the base station 101 transmits an overhead channel control message indicating RSCM enable. In step 510, the base station 101 monitors traffic, such as an increase in the number of mobile stations operating with RSCM. If the level of the mobile station operating with RSCM exceeds a predetermined threshold, in step 515 the base station 101 transmits an overhead channel control message indicating that RSCM is disabled. The predetermined threshold here is the maximum allowable number of mobile stations operating in RSCM or the maximum amount of traffic transmitted to the mobile stations operating in RSCM.

The predetermined thresholds are thresholds that indicate the degree of interference with general paging channel scheduling. Thereafter, the new mobile stations approaching the base station 101 in step 520 perform a full slot cycle mode, which is only a general operation mode.

Thereafter, in step 525, the base station 101 transmits a control message to a target mobile station that selectively operates in RSCM to prevent the target mobile stations from continuously operating in RSCM. Then, in step 530, the base station 101 selectively transmits control messages to one or more target mobile stations corresponding to enable target mobile stations of preferential subscribers (eg, high paging) to perform RSCM. do.

In a situation where a lot of mobile stations have a lot of traffic to perform RSCM for network performance, as described above, the base station can control paging scheduling by controlling whether the mobile station uses RSCM.

Then, the base station according to the second embodiment will now be described below with reference to Figs. 8 to 9 for a process for changing the RSCI of each corresponding mobile station using a release order message.

First, the message format of the release order messages 600 and 700 used in the second embodiment will be described with reference to FIGS. 6 to 7.

6 illustrates a release order message 500 sent by a base station to a mobile station to enable the use of a particular SCI for a particular mobile station in accordance with a second embodiment of the present invention. In FIG. 6, the release order message 600 includes an order specific code field 601, a release type field 602, a system authentication (SID) field 603, a network authentication (NID) field 604, and an RSCI field 605. ).

Here, different RSCI values may be used that are specific to each mobile station in the cell of the base station. Thus, the base station sends a release order message containing a preferred RSCI value for a particular mobile station within the call channel to cause the mobile station to transition from the call state to the idle state by the RSCI value. Since a separate release order message is used for each mobile station transitioning from a call state, it is possible to change RSCI to different values within the same cell.

7 illustrates a release order message 600 format that a mobile station sends to a base station to enable using a particular SCI for a particular mobile station in accordance with a second embodiment of the present invention. In FIG. 7, the release order message includes an order specific code (ORDQ) field 601, an RSC_MODE indicator (RSC_MODE_IND) field 602, an RSCI field 603, an RSCM end time unit (RSC_END_TIME_UNIT) field 604, and an RSCM end time. A value (RSC_END_TIME_VALUE) field 605 is included.

Here, an RSC_MODE_IND field 602 of "1" indicates that the mobile station will operate in RSCM according to the release of the call channel. If the RSC_MODE_IND field 602 is set to "1", the RSCI field 603 is set to the RSCI value at which the mobile station will operate. If the RSCI value in the release order message 500 received by the mobile station is acceptable at the mobile station, the mobile station includes the same RSCI value in the RSCI field 603. If the received RSCI value is not acceptable at the mobile station, the mobile station sets the RSCI field 603 to an RSCI value supportable at the mobile station. Enable the mobile station via RSC_END_TIME_UNIT 604 and RSC_END_TIME_VALUE 605 to indicate the system time (modulo 16) in units of specified time by which the RSC_END_TIME_UNIT field 604 will exit RSCM.

8 is a flow diagram 800 illustrating the flow of messages for a particular mobile station to select an RSCI value in accordance with a second embodiment of the present invention. In step 801, the mobile station 112 operates in a call state. At a particular point in time, when the call session ends, such as the call is ended or disconnected, the base station 101 modulates a release order message including a data field having a supportable RSCI value for operating the mobile station 112 in step 802. Transmit to mobile station 112.

In step 803, the mobile station 112 transmits a modulated release order message that includes a data field that includes a RSCI value that the mobile station 112 can support. If the RSCI value transmitted from the base station 101 is acceptable in step 802, the MS-preferred RSCI in the release order message in step 803 is BS- of the release order message received from the base station 101 in step 802. Same as preferred RSCI. Here, MS-preferred RSCI refers to RSCI supported by the mobile station stored in the mobile station 112, and BS-preferred RSCI refers to the RSCI determined by the base station 112 according to the quality of service of the mobile station 112.

However, if the RSCI value transmitted from the base station 101 in step 802 is not acceptable in step 803, the MS-preferred RSCI in the release order message is different from the BS-preferred RSCI. Optionally, the mobile station 112 may include a time period in the release order message in which the mobile station 112 will operate using MS-preferred RSCI in step 803.

Thereafter, the mobile station 112 operates at the MS-preferred RSCI value at operation 804, and the base station 101 operates at the MS-preferred RSCI value or a normal SCI value at operation 805. Here, the general SCI value is usually determined by the number of mobile stations and the amount of traffic that can be accommodated in system deployment by simulation.

If the MS-preferred RSCI value is acceptable in the base station 101, the base station 101 operates with the MS-preferred RSCI value. If base station 101 operates at a typical SCI value, base station 101 sends paging messages to mobile station 112 within a selected subset of paging channel slots determined by the SCI value. And, the mobile station 112 monitors all paging channel slots (since the period of RSCM operation is a fraction of the slot cycle period of 1.28 seconds) so that no paging messages from the base station 101 are missed.

9 is a flowchart 900 illustrating a process of selecting an RSCI for a specific mobile station in a wireless communication system according to an embodiment of the present invention. First, in step 905, the mobile station 112 maintains a call state during a session with the base station 101. After the session is terminated, the base station 101 determines the RSCI value of the mobile station 112 and the RSCI values supported by the base station 101 according to the service associated with the mobile station 112 in step 910. For example, the service may be a gaming application, push-to-talk, QCHAT, normal communication service or other forms of service.

Thereafter, in step 915, the base station 101 transmits a release order message including a data field for authenticating a supportable RSCI value to the mobile station 112. If the RSCI value received in the release order message is acceptable in the mobile station 112 in step 920, the mobile station 112 transmits a response message to the base station 101 in step 925. Such a response message is a release order message or other confirmation message. This response message also includes a data field that authenticates the RSCI value sent by the base station 101 to confirm that the mobile station 112 will operate at the RSCI value upon release of the call channel.

On the other hand, if the RSCI value received in the release order message from the mobile station 112 in step 920 is not acceptable, the mobile station 112 determines a new RSCI value for the mobile station 112 to operate in step 930. Thereafter, the mobile station 112 transmits a response message to the base station 101 in step 935. At this time, the response message is a release order message or confirmation message. This response message includes a data field that authenticates the new RSCI value determined by the mobile station 112 to inform the base station 101 that the mobile station 112 will operate at the new RSCI value upon release of the call channel.

As described above, the base station and the mobile station can select an optimal RSCI value when using the RSCM to perform an RSCM operation with an RSCI value suitable for each mobile station.

While the present invention has been illustrated and described with reference to certain preferred embodiments, it will be apparent to those skilled in the art that the present invention may be modified and varied in various ways. The present invention is intended to cover such changes and modifications as long as such changes and modifications fall within the scope provided by the appended claims.

As described above, the present invention enables the base station to optimize paging scheduling by controlling whether the mobile station uses RSCM. In addition, by enabling each mobile station performing a different application to use the RSCI values appropriate for its application, it is possible to unnecessary waste battery life or to affect the application performance of other mobile stations.

1 illustrates an exemplary wireless network in accordance with an embodiment of the present invention;

2 is a diagram illustrating a base station according to an embodiment of the present invention;

3 illustrates a wireless mobile station according to an embodiment of the present invention;

4 shows a state diagram representing the logical state of a typical mobile station;

5 is a flowchart illustrating a process for operation of an RSCM between a base station and a mobile station in a wireless communication system according to a first embodiment of the present invention;

6 illustrates an enhanced release order message including an SCI value selected at a base station according to the second embodiment of the present invention;

7 is a diagram illustrating a release order message including an SCI value selected at a mobile station according to a second embodiment of the present invention;

8 is a signal flow diagram for selecting an RSCI value of a specific mobile station between a base station and a mobile station according to a second embodiment of the present invention;

9 is a flowchart illustrating a process for selecting an RSCM value for a specific mobile station in a wireless communication system according to a second embodiment of the present invention.

Claims (36)

A base station apparatus for controlling reduced slot cycle mode (RSCM) operation of mobile stations in a wireless communication system, A traffic monitor for monitoring traffic statistics for the mobile stations; RSC for selecting a mobile station to disable RSCM among the mobile stations when the traffic statistics value exceeds a preset threshold value, and generating and transmitting a first control message for disabling RSCM to the selected mobile station. reduced slot cycle) The base station apparatus, characterized in that it comprises a controller. 2. The base station apparatus as claimed in claim 1, further comprising an RF transmitter for transmitting a first control message generated from the RSC controller to the selected mobile station. The base station apparatus as claimed in claim 1, wherein the traffic statistics are the number of mobile stations operating in the RSCM. 2. The base station apparatus as claimed in claim 1, wherein the threshold value is a maximum allowable number of mobile stations operating with the RSCM. 2. The base station apparatus as claimed in claim 1, wherein the threshold value is a maximum value of the amount of traffic transmitted to a mobile station operating with the RSCM. The base station apparatus as claimed in claim 1, wherein the first control message is transmitted through one of an overhead channel and a traffic channel. The base station apparatus as claimed in claim 1, wherein the first control message is a message for controlling to operate in a full slot cycle mode. The method of claim 1, wherein the RSC controller, And selecting new mobile stations approaching the base station when selecting one of the mobile stations to disable RSCM. The method of claim 1, wherein the RSC controller, And generating and transmitting a second control message for controlling to operate in RSCM as a mobile station for operating in the full slot cycle mode. The method of claim 9, wherein the RSC controller, And the second control message is transmitted according to the quality of service (Qos) of the mobile station. A base station apparatus for controlling RSCM operation of mobile stations in a wireless communication system, A service monitor for monitoring a quality of service provided to the mobile stations; Grouping the mobile stations according to the quality of service of the monitored mobile stations, matching preset reduced slot cycle index (RSCI) values for each group, and generating a release order message including the matched RSCI values for each mobile station. And an RSC controller for transmitting data to the base station. 12. The base station apparatus as claimed in claim 11, further comprising an RF transmitter for transmitting a first control message generated from the RSC controller to the mobile station. 12. The base station apparatus according to claim 11, wherein the quality of service comprises at least one of a delay rate, a minimum required transmission rate, and a statistical traffic amount. The method of claim 11, wherein the RSC controller, And a response message including an RSCI value requested by the mobile station from the mobile station. The method of claim 14, And if the RSCI value transmitted by the base station and the RSCI value required by the mobile station are the same, the base station operates at the RSCI value to page the mobile station. The method of claim 14, If the RSCI value transmitted by the base station and the RSCI value required by the mobile station are different from each other, the base station operates with either the RSCI value required by the mobile station or a normal SCI (normal slot cycle index) value for paging the mobile station. The base station apparatus characterized in that. A method for controlling reduced slot cycle mode (RSCM) operation of mobile stations in a base station apparatus of a wireless communication system, A first step of monitoring, by the base station apparatus, the number of mobile stations operating with the RSCM; Selecting a mobile station to disable RSCM among the mobile stations when the traffic statistics value exceeds a preset threshold, generating a first control message for disabling RSCM to the selected mobile station, and then controlling the traffic statistics to be transmitted; The RSCM control method characterized in that it comprises two steps. 18. The method of claim 17, wherein the traffic statistics are the number of mobile stations operating with the RSCM. 18. The method of claim 17, wherein the threshold is a maximum allowable number of mobile stations operating with the RSCM. 18. The method of claim 17, wherein the threshold value is a maximum value of the amount of traffic transmitted to a mobile station operating with the RSCM. 18. The method of claim 17, wherein the first control message is transmitted through one of an overhead channel and a traffic channel. 18. The method of claim 17, wherein the first control message is a message for controlling to operate in a full slot cycle mode. 18. The method of claim 17, wherein when selecting a mobile station to disable RSCM among the mobile stations in the second step, new mobile stations approaching the base station are selected. 24. The method of claim 23, further comprising a third process of generating and transmitting a second control message for controlling to operate in RSCM as a mobile station for operating in the full slot cycle mode. The RSCM control method, characterized in that. 25. The method of claim 24, wherein the second control message is transmitted according to the quality of service (Qos) of the mobile station. A method for controlling the RSCM operation in a base station apparatus for controlling the reduced slot cycle mode (RSCM) operation of one or more mobile stations in a wireless communication system, Monitoring the services provided to the mobile stations; Grouping the mobile stations according to the quality of service of the monitored mobile stations, matching preset RSCI values for each group, and transmitting a release order message including the matched RSCI values to each of the mobile stations. The RSCM control method characterized in that it comprises. 27. The method of claim 26, wherein the quality of service comprises at least one of a delay rate, a minimum required transmission rate, and a statistical traffic amount. 29. The method of claim 27, further comprising receiving a response message including an RSCI value requested by the mobile station from the mobile station. The method of claim 28, And if the RSCI value transmitted by the base station and the RSCI value required by the mobile station are the same, operating the base station in the RSCI value to page the mobile station. The method of claim 28, If the RSCI value transmitted by the base station and the RSCI value requested by the mobile station are different from each other, the base station operates with either the RSCI value required by the mobile station or a normal slot cycle index (SCI) value for paging the mobile station; The RSCM control method characterized in that it further comprises. A mobile station apparatus for controlling RSCM operation in a wireless communication system, An RF receiver for receiving a release order message containing an RSCI value from a base station; A memory for storing RSCI values that can be supported by one or more terminals; If the RSCI value in the received release order message matches at least one of the stored RSCI values, control to send a response message including the RSCI value received from the base station to the base station, and perform the RSCM operation with the RSCI value. And a controller for controlling. The method of claim 31, wherein the controller, If the RSCI value in the received release order message does not match at least one of the stored RSCI values, a response message including one of the stored RSCI values is transmitted to the base station, and the RSCM operation is performed using the transmitted RSCI values. And the mobile station apparatus. 32. The method of claim 31, wherein the release order message includes at least one of an RSC_MODE indicator and information regarding a valid time of the RSCI. A method for controlling RSCM operation in a mobile station apparatus having a memory for storing RSCI values that can be supported by one or more terminals, the method comprising: Receiving a release order message including an RSCI value from a base station, If the RSCI value in the received release order message matches at least one of the stored RSCI values, transmitting a response message including the RSCI value received from the base station to the base station and controlling the RSCM operation with the RSCI value. The RSCM control method characterized in that it comprises a. The method of claim 34, If the RSCI value in the received release order message does not match at least one of the stored RSCI values, a response message including one of the stored RSCI values is transmitted to the base station and the RSCM operation is controlled by the transmitted RSCI values. The RSCM control method further comprising the step of. 35. The method of claim 34, wherein the release order message includes at least one of an RSC_MODE indicator and information regarding a valid time of the RSCI.