KR20070008895A - Apparatus and method for control slotted mode of mobile station using code division multiple access technology - Google Patents

Abstract

An apparatus and a method for controlling a slotted mode of a terminal supporting CDMA technology are provided to transmit a necessary message by recovering forward and backward link timing within the least time when a user presses a key for call connection in a mode requesting fast call set up, thereby transmitting the message with the least delay in a sleep mode state and accordingly minimizing inconvenience of the user. An apparatus for controlling a slotted mode of a terminal supporting CDMA technology comprises a sleep controller(430), a controller(420), and a modem(400). The controller(420) wakes up by key interrupt of the sleep controller(430). When key input of a user causing the key interrupt needs transmission of a message, the controller(420) sets the sleep controller(430) so as to convert the current mode into a normal mode at a PN(Pseudo-random Noise) boundary point of time closest after the key input. The controller(420) generates a selection signal for selecting a 20msec boundary point of time closest after the PN boundary point of time. When the mode is converted from a sleep mode into the normal mode by the sleep controller(430), the modem(400) selects the 20msec boundary point of time closest after the PN boundary point of time according to the selection signal. The modem(400) recovers receiving timing synchronous with the selected 20msec boundary point of time, and recovers transmission timing which is advanced as much as a time advance value, given from the controller(420), from the receiving timing.

Description

Apparatus and method for controlling slot mode of a terminal supporting code division multiple access technology {APPARATUS AND METHOD FOR CONTROL SLOTTED MODE OF MOBILE STATION USING CODE DIVISION MULTIPLE ACCESS TECHNOLOGY}

1 illustrates an example of a typical slot mode operation.

2 is a diagram illustrating a relationship between a catapse and slot timing in a slot mode operation.

3 illustrates timing of received and transmitted signals after key input.

Figure 4 is a block diagram showing a slot mode control apparatus of a terminal according to an embodiment of the present invention.

5 is a diagram illustrating a timing relationship between a PN boundary signal and a 20 msec boundary signal according to a preferred embodiment of the present invention.

Fig. 6 is a diagram showing a relationship between 20 msec boundary signals selected according to key input positions.

7 is a flowchart illustrating a slot mode control operation according to a preferred embodiment of the present invention.

8 is a flowchart illustrating operation of a modem according to a preferred embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a code division multiple access (CDMA) mobile communication terminal, and more particularly, to an apparatus for controlling slotted mode operation for efficient timing recovery and fast transmission of a terminal. And to a method.

In general, the CDMA terminal operates most of the time in the slotted mode to reduce power consumption. In the slot mode, a base station transmits specific messages to be transmitted separately by a terminal only in a slot allocated to each terminal. Each terminal monitors only a specific slot (hereinafter referred to as paging slot) allocated to itself on a paging channel. At other times, it operates in a power save mode that turns off or disables all blocks except minimal hardware for timing maintenance. This power transfer mode is generally referred to as a sleep mode.

When it is time to operate in the power saving mode, the control software of the terminal calculates a slot to be monitored next time and informs the sleep controller, and turns off the power-off blocks in order. The sleep controller operates separately from the hardware of the terminal with the minimum power. When the sleep controller counts the slow clock and operates in the normal mode, the sleep controller performs the operation of the main clock and the slow clock. Compensates for timing differences and turns the blocks on or enable at the correct time. This process is commonly called a wake up process. The terminal performs necessary operations such as paging channel monitoring and pilot search in the normal mode, and then repeats power on / off in the same manner.

1 illustrates an example of a slot mode operation.

Referring to FIG. 1, paging slot 102 has a length of 80 msec and is identified by a paging slot number between 0-2047. Therefore, the maximum possible period of the paging slot is 80msec * 2048 = 163.84sec. The actual period of the paging slot is determined by the base station, the slot allocated to the terminal is determined through a hash function (hash function). In the illustrated example, the paging slot period 104 is 1.28 sec, and the slot allocated to the terminal is (slot number% 16) = 6, and the terminal monitors slots # 6, # 22, # 38 ... . In other slots, the UE operates in a power-proactive mode, that is, a non-active state 110, and transitions to the active state shortly before the slot 106 to be monitored recovers timing. Search for the pilot and prepare to receive the paging channel (re-acquisition of CDMA system).

In most commercial networks, the paging slot period is set at 2.56 seconds or 5.12 seconds. Therefore, the terminal transitions to the active state once every 2.56 seconds or 5.12 seconds while remaining in an inactive state. In this case, when the user presses a key, the terminal's response may appear after 2.56 seconds or 5.12 seconds at the maximum. In order to solve this problem, the terminal repeats power on / off in a shorter period for some blocks for a key scan, which is called a catnap.

2 illustrates a relationship between the catapse and the slot timing in the slot mode operation. Catapult cycles are multiples of 80 msec, often using 320 msec or longer.

Referring to FIG. 2, in the normal case in which there is no key press or folder open, the terminal may enter the inactive state again after monitoring the allocated paging slot 210 of the paging channel 202. Once the determination is made, the primary catnap 212 is started. Although FIG. 2 illustrates that the primary catnap 212 starts at the end of the allocated 80msec slot 210, the starting point of the primary catnap 212 is 26.6msec PN (Pseudo-random Noise) boundary. Can vary in (boundary) units.

The hardware of the terminal is largely divided into a central processing unit (CPU) 202 that executes software, a modem 206, a radio frequency (RF) / intermediate frequency (IF) block 208, and the like. Depending on the situation, each of the blocks may be on / off as appropriate.

At the beginning of the primary catnap 212, the control software calculates the catapna interval length and the position of the wakeup interrupt 214 and informs the sleep controller, and then removes all hardware except the sleep controller. Turn off the power. The sleep controller uses the slow clock to generate a wakeup interrupt 214 at the wakeup interrupt occurrence. At this time, the CPU 204 is activated, and depending on whether or not the key interrupt 224, whether the entire hardware block should wake up or if it is possible to recapture, the CPU 204 and other blocks are activated. Determine if it should be. If it is possible to do the catapult again, the secondary catnap 2216 is started in the same manner as the primary catnap 212. In this manner, when the catapult is reached and the slot boundary 218 is reached, the control software calculates the length and wakeup time of the last catnap 220 to monitor the next assigned slot 222, The RF / IF block 208 and the modem 206 are turned on when the last catnap 220 terminates. Here, the modem is turned on 26.6 ms before the allocated paging slot, and the RF / IF block 208 is turned on before the allocated paging slot in consideration of the warm-up time and the reacquisition time according to the characteristics of the circuit element.

3 illustrates timing of received and transmitted signals after key input.

Referring to FIG. 3, the base station and the terminal have 80 msec synchronization signals (SYNC80M) 302 and 304 that are synchronized with each other. When a situation such as a key input or a folder open occurs in the catapult section 314 promised between the base station and the terminal, the sleep controller of the terminal turns on the CPU and generates a wake-up interrupt 316 to the controller control software of the CPU. Let me know The control software analyzes the input key signal and turns on the modem and the RF / IF block after the current catnap is completed in the call origination situation. The modem then recovers the receive (RX) and transmit (TX) timings 308, 310 to synchronize with the PN boundary signal 306 to proceed with the call process. If the above situation does not occur, the terminal performs the next catapult as shown in FIG. 2 after the necessary processing is completed.

If the user wants to use a terminal function that does not require communication with the base station, such as calling or short message service (SMS), for example, playing a game or taking a picture, While the devices and the CPU are still on, only the on / off of the modem and the RF / IF block for slot monitoring are repeatedly performed as shown in FIG. 2.

If transmission to the base station is required, the control software initializes the transmitter and generates a transmission timing 310, which is created by advancing the timing by a constant value relative to the reception timing 308. 318)

As shown in FIG. 3, when a situation arises where a message should be sent to a base station, the control software first informs the transmitter of a time advance value 320 using the control signal 312, and the transmitter forwards. Based on the 80msec sync signal SYNC80M of the link, a 20msec transmit sync signal (TX SYNC20M) 322, which is timing-advanced at the beginning of the next 20msec frame, is generated. The control software calculates the PN long code state 324 for the 80 msec sync signal and informs the transmitter using the control signal 312, which then transmits the long code state at the next 80 msec boundary time point 326. Apply to generate PN long code. Then, at the next 20msec frame boundary, the actual message transmission starts. That is, the preparation time for transmission needs to be at least 126.6 msec and at most 180 msec.

As shown in FIG. 3, when a key is input and a modem and an RF block of the terminal are to be activated, a delay of a maximum catapult period may occur from a key input time to a time point at which the terminal is activated. The paging channel is composed of 20msec frames, and the timing calculation is based on 26.6 (= 80/3) msec, which is the period of the PN long code generator, so that both the frame period and the PN boundary signal are used to match the 20msec timing. The matching 80msec timing is used as the reference point. If the catapult interval is not a multiple of 80msec, another delay may occur here. In addition, according to FIG. 3, it can be seen that a transmission preparation time for aligning the transmission timing 310 to the reception timing 308 and performing long code setting requires a minimum of 126.6 msec and a maximum of 180 msec.

While the above delays can be tolerated in typical call connections, applications that require fast connections, such as Push-to-Talk (PTT) services, can reduce this delay as much as possible to make call setup faster. It should be. In the case of PTT service, the time from when a user presses a key until the call is connected is limited to about 1sec. This time, the sender presses a key to send the necessary message to the base station, the terminal is connected to the base station connected to the receiver and sends the required message to the receiver, the receiver's terminal recognizes the message and sends a response to the base station, the sender It must include all processes of connecting a voice traffic path (voice traffic path) between the terminal of the terminal and the terminal of the receiver. However, according to the above calculation, the prior art has a problem in that the time until the sender presses a key to start transmission of necessary messages to the base station may be delayed up to a maximum catapult period + 53.2 msec + 126.6 msec.

Therefore, the present invention devised to solve the problems of the prior art operating as described above, the apparatus for recovering the forward link timing as soon as possible when the user presses a key for a call connection when a quick call setup is required; Provide a method.

The present invention provides an apparatus and method for transmitting a message by recovering reverse link timing in the earliest time when a user inputs a key.

In order to achieve the above object, an embodiment of the present invention provides a slot mode control apparatus for a terminal supporting a code division multiple access technology.

A sleep controller that counts the slow clock in sleep mode to control the transition between sleep mode and normal mode;

In the normal mode at the closest pseudo-random noise (PN) boundary point after the key input, when the user wakes up by the key interrupt of the sleep controller and the key input of the user who caused the key interrupt requires the transmission of the message. A controller configured to set the sleep controller to switch to the controller, and generating a selection signal for selecting the closest 20 msec boundary time point after the PN boundary time point;

When the sleep mode is changed from the sleep mode to the normal mode, the closest 20msec boundary time point after the PN boundary time point is selected according to the selection signal, and the reception timing and the reception timing are synchronized with the selected 20msec boundary time point. Characterized in that it comprises a modem for recovering the transmission timing advanced by the given timing advance value from the control unit.

Another embodiment of the present invention, in the slot mode control method of a terminal supporting a code division multiple access technology,

Wake-up by the user's key input in sleep mode;

When the key input requires transmission of a message, switching the modem to a normal mode at the closest PN boundary after the key input;

Selecting the nearest 20msec boundary time point after the PN boundary time point;

And by the modem, recovering a reception timing synchronized with the selected 20 msec boundary time point and a transmission timing advanced by a given timing advance value from the control unit rather than the reception timing.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

A key feature of the present invention described below is controlling slot mode operation of a CDMA terminal, and particularly discloses control software and hardware for quickly and efficiently converting a power saving mode terminal to a normal mode at any point in time rather than at a predetermined point in time. Specifically, in the method for recovering the forward link timing according to the preferred embodiment of the present invention, when the key is pressed, the terminal calculates the closest PN boundary value that the terminal can switch to the normal mode, and the PN boundary according to the calculated boundary value. To turn on hardware blocks.

4 is a block diagram illustrating a slot mode control apparatus of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the controller 420 having control software has an interface with the sleep controller 430 and controls the modem 400. The modem 400 includes a PN generator 402 for generating a 26.6 msec PN boundary signal, a 20 msec boundary signal generator 404 for generating three 20 ms boundary signals in synchronization with the PN boundary signal, and the controller 420. A selector 406 for selecting one of the three 20 ms boundary signals according to a selection signal of a signal, a reception timing controller 408 for generating a 20 msec receive synchronization signal RX SYNC20M using the selected signal, and a receive signal; And a transmitter 412 that includes an analyzer 410, a transmit timing controller 414, and a transmit signal generator 416.

The controller 420 calculates an appropriate long code state according to the 20msec boundary selected in the forward link, and inputs the calculated long code state and the timing advance value to the transmitter 412. The long code state is calculated by selecting one of the 2 ⁴² -1 states given in the CDMA system that corresponds to the current time, that is, the actual transmission timing. The timing forward value is also given according to the characteristics of the transmission and reception circuit elements.

The transmission timing controller 414 generates a 20 msec transmission synchronization signal TX SYNC20M advanced than the selected 20 msec boundary signal according to the timing advance value, and the transmission signal generator 416 synchronizes the long in synchronization with the transmission synchronization signal. Applies the code state to the transmission signal. Meanwhile, the reception timing controller 408 generates a 20msec reception synchronization signal RX SYNC20M which is synchronized with the selected 20msec boundary signal and provides the received signal analyzer 410 to the reception signal analyzer 410.

5 shows a timing relationship between a PN boundary signal and a 20 msec boundary signal according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the PN boundary signal 502 has a period of 26.6 msec, and the 20 msec boundary signal 504 includes three pulse signals B20_1 and B20− that are continuously generated from every occurrence of the PN boundary signal 502. 2, B20-3. In detail, the generation time of the B20_1 signal 508 is the time after 6.67msec from the PN boundary 506, the B20_2 signal 510 occurs at the time after 13.34msec, and the B20_3 signal 512 at the time after 20msec Occurs.

In the sleep mode, the control unit 420 is turned on by the key interrupt of the sleep controller 430, and determines whether to activate the communication circuit unit of the terminal, that is, the modem 400 and the RF block (not shown) by the key input. do. For example, if the key input causing the key interruption requires a PTT call setup or an SMS transmission, the controller 420 determines to activate the communication circuit of the terminal.

If it is determined that the modem 400 and the RF block (not shown) should be activated by the key input, the controller 420 reads a slow count value from the sleep controller 430 to calculate a current time point, and calculates the current time. From the current time point, the reference count value is sent to the sleep controller 430 so that the modem's PN generator 402 can operate to generate the PN boundary signal at the nearest PN boundary time point after the time for internal processing. to provide. When the slow count value reaches the reference count value, the sleep controller 430 turns on the entire modem 400. In addition, the controller 420 turns on the 20 msec boundary signal generator 404 while setting the sleep controller 430.

When the modem 400 is activated, the 20 msec boundary signal generator 404 turned on by the controller 420 sequentially generates three 20 msec boundary signals whenever the PN boundary signal is generated from the PN generator 402. The alert signals continue to occur until the controller 420 turns off the 20 msec alert signal generator 404. That is, the 20 msec boundary signal generator 404 sequentially generates three 20 msec boundary signals B20_1, B20_2, and B20_3 at an interval of 6.67 msec from the PN boundary as shown in FIG. 5. That is, the signals B20_1, B20_2, and B20_3 are signals of 26.6 msec periods, which are 6.67 msec, 13.34 msec, and 20 msec later than the PN boundary signals, respectively, indicating possible starting positions of the 20 msec boundary. The selector 406 selects one of the three signals according to the selection signal from the controller 420.

6 illustrates a relationship between 20 msec boundary signals selected according to key input positions.

Referring to FIG. 6, the PN generator 402 of the terminal generates a PN boundary signal 604. The PN boundary signal 604 has four pulse signals P1, P2, P3, and P4 having a 1/3 period of the 80 msec synchronization signal 602 and having a 26.6 msec interval.

Key input 614 occurs between P1 and P2. The modem 400 is then operated by the sleep controller 430 at P2, and thus the B20_2 signal 616 that matches the 20msec boundary closest to P2 among the 20msec boundary signals 606 is selected. If the key input is between P2 and P3, the modem 400 operates at P3 and the B20_1 signal is selected. Also, if the key input is between P3 and P4, the modem 400 operates at P4 and B20_3 is selected.

For transmission, the control unit 420 calculates an appropriate long code state according to the current time point, and turns on the transmitter 412 while transmitting a control signal 612 indicating a timing advance value and the calculated long code state. ). The transmission timing controller 414 of the transmitter 412 generates a 20 msec transmission synchronization signal (TX SYNC20M) 610 advanced by the timing forward value according to the 20 msec boundary signal selected by the selector 406, and simultaneously transmits the transmission signal. The generator 416 updates the state vector of an internal PN long code generator (not shown) according to the long code state provided from the controller 420.

The PN long code generator inside the transmission signal generator 416 generates a long code chip using a long code mask determined by an electronic serial number (ESN) of the terminal and the state vector, and encodes a message to be transmitted. The modulated transmission signal is scrambled by the long code chip. The scrambled signal is carried on the RF signal by the RF / IF block and transmitted to the receiving side.

For example, as shown in FIG. 6, when the key input point is between P1 and P2, the controller 420 sets the sleep controller 430 according to the key input point and controls various kinds of controls necessary for transmission to the modem 400. Enter the values. Accordingly, the PN boundary signal starts to be generated at the P2 time point, and the B20_2 signal is selected to generate a 20msec reception synchronization signal RX SYNC20M according to the B20_2. In addition, a 20msec transmission synchronization signal (TX SYNC20M) 610 starts to be generated at the time T1 620 ahead of the timing advance value 618 before the B20_2, and in fact, the message transmission starts at the time T2 622. In order to transmit and receive a message, the RF / IF block needs to be warmed up. The warm up generally requires about 10 msec. In the case of the present invention, the time from when the modem 400 and the RF / IF block are turned on until transmission actually starts is sufficient to warm up the RF / IF block.

In the case of the present invention, the time from the key input until the actual transmission starts is less than 80 msec, and only about 106.67 msec even if the key is input near the PN boundary.

7 is a flowchart illustrating a slot mode control operation according to a preferred embodiment of the present invention.

Referring to FIG. 7, in step 702, the terminal is in a sleep mode in which the CPU 420, the modem 400, the RF / IF block, etc. are all turned off and only the sleep controller 430 operates. If a key interrupt occurs from sleep controller 430 in step 704, then CPU 420 is turned on by the key interrupt in step 708 so that the user's key input that caused the key interrupt requires activation of the communications circuitry. Check if

If it is a key input that requires activation of the communication circuitry, in step 710 the CPU 420 reads the sleep count value from the sleep controller and the reference count value corresponding to the nearest PN boundary at which the terminal can switch to normal mode. Is set in the sleep controller 430. In addition, in step 712, the CPU 420 calculates control values for the modem 400 so that it can be used when the modem 400 is turned on by the sleep controller 430, and the control signals to the modem 400. Enter Specifically, the control signals for the modem 400 are for turning on the 20 msec boundary signal generator and selecting the 20 msec boundary signal, and the control values for the modem 400 mean a timing forward value and a long code state.

8 is a flowchart illustrating the operation of a modem according to a preferred embodiment of the present invention.

Referring to FIG. 8, in operation 800, the main clock is supplied to the modem 400 by the sleep controller 430, and the modem 400 starts to operate. In step 802, the 20 msec boundary signal generator 404 of the modem 400 generates three 20 msec boundary signals in synchronization with the PN boundary signal. In step 804, the selector 406 selects one 20 msec boundary signal closest to the key input time point. In step 806, the reception timing controller 408 generates and provides a received 20msec synchronization signal in synchronization with the selected 20msec boundary signal to the received signal analyzer 410. In addition, in step 808, the transmission timing controller 44 generates a transmission 20msec synchronization signal that is advanced by a timing forward value than the selected 20msec boundary signal and provides it to the transmission signal generator 416. The transmission signal generator 416 generates a transmission signal using the long code state provided from the CPU 420 in synchronization with the transmission 20msec synchronization signal.

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 those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

According to the present invention, when a user presses a key for a call connection in a mode requiring fast call setup, the forward link timing and the reverse link timing are restored as soon as possible and the necessary message is transmitted. The present invention has the effect of minimizing user inconvenience by transmitting a message with a minimum delay in the sleep mode.

Claims (10)

In the slot mode control apparatus of a terminal supporting code division multiple access technology, A sleep controller that counts the slow clock in sleep mode to control the transition between sleep mode and normal mode; In the normal mode at the closest pseudo-random noise (PN) boundary point after the key input, when the user wakes up by the key interrupt of the sleep controller and the key input of the user who caused the key interrupt requires the transmission of the message. A controller configured to set the sleep controller to switch to the controller, and generating a selection signal for selecting the closest 20 msec boundary time point after the PN boundary time point; When the sleep mode is changed from the sleep mode to the normal mode, the closest 20msec boundary time point after the PN boundary time point is selected according to the selection signal, and the reception timing and the reception timing are synchronized with the selected 20msec boundary time point. And a modem for recovering transmission timing advanced by a given timing forward value from the control unit. The method of claim 1, wherein the control unit, And calculating and providing a PN long code state for a reverse link according to the selected 20msec boundary time point to the modem. The method of claim 2, wherein the modem, A PN generator generating a PN boundary signal at a 26.6 msec period from the PN boundary time point; A 20msec boundary signal generator for generating three 20msec boundary signals, each representing possible 20msec boundary views, in synchronization with the PN boundary signal; A selector for selecting one of the three 20 msec boundary signals according to the selection signal; A reception timing controller for generating a 20msec reception synchronization signal in synchronization with the selected 20msec boundary signal; And a transmission timing controller for generating a 20msec transmission synchronization signal that is advanced by the timing forward value than the selected 20msec boundary signal. The method of claim 3, wherein the modem, And a transmission signal generator configured to receive the PN long code state and generate a transmission signal using the PN long code state in synchronization with the 20 msec transmission synchronization signal. The method of claim 1, wherein the control unit, And converting the closest PN boundary time point after the key input into a slow count value and providing the same to the sleep controller. In the slot mode control method of a terminal supporting a code division multiple access technology, Wake-up by the user's key input in sleep mode; When the key input requires the transmission of a message, switching the modem to a normal mode at the closest pseudo-random noise (PN) boundary after the key input; Selecting the nearest 20msec boundary time point after the PN boundary time point; And recovering, by the modem, a reception timing synchronized with the selected 20 msec boundary time point and a transmission timing advanced by a given timing advance value from the control unit rather than the reception timing. The method as claimed in claim 6, further comprising calculating and providing a PN long code state for a reverse link according to the selected 20msec boundary time point to the modem. The method of claim 7, wherein the restoring process, Generating a PN boundary signal at a 26.6 msec period from the PN boundary time point; Generating three 20 msec boundary signals, each representing possible 20 msec boundary time points, in synchronization with the PN boundary signal; Selecting one of the three 20 msec boundary signals according to the selection signal; Generating a 20msec receive synchronization signal in synchronization with the selected 20msec boundary signal; And generating a 20msec transmission synchronization signal advanced by the timing forward value than the selected 20msec boundary signal. The method of claim 8, wherein the restoring process, And receiving the PN long code state and generating a transmission signal using the PN long code state in synchronization with the 20msec transmission synchronization signal. The method of claim 6, And setting a sleep controller to switch the modem to a normal mode at the closest PN boundary time point after the key input.

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