TW200950541A - Precise sleep timer using a low-cost and low-accuracy clock - Google Patents

Abstract

A wireless transmit/receive unit (WTRU) uses an oscillator providing accuracy for synchronized communications parameters in an active mode, and operates at reduced power during a discontinuous reception (DRX) mode. A real time clock (RTC) is used as the frequency standard during the reduced power operation, and a frequency adjustment is effected while the RTC is used as the frequency standard. By effecting the frequency adjustment, the RTC is able to be used as the frequency standard for substantial time periods, thereby reducing power consumption of the WTRU during the DRX mode.

Description

200950541 VI. Description of the Invention: [Technical Field] The present invention relates to a reference slit for a wireless inspection device, and a control for power consumption control of such a reference oscillator. [Prior Art] There is an algorithm for correcting a low-precision clock with respect to a clutter clock, also called a master clock. This allows for a low-accuracy clock to produce almost the same precision as the master clock, and the ribs are all _ things-dependent _corrective low-precision clocks. In battery-driven devices such as wireless transmit/receive units (10) and other mobile devices, it is important to limit power consumption to extend battery life. The algorithm and hardware of the WTRU should be designed to minimize the complexity of the battery life by reducing the power consumption during periods of inactivity during which certain functions can be turned off or reduced. The operation of the power mode. The configuration allows the WTRU to operate at a low level during periods of inactivity. When the delivery of a beer or other proprietary connection is not made, the WTRU only needs to perform certain functions occasionally to maintain synchronization and communication with its associated base station. This provides an inactive interscale interval that allows the WTRU to minimize its power consumption. This is achieved by the WTRU making a discontinuous reception (DRX) operation where the WTRu periodically cycles between "sleep" and "wake'. Unwanted power consumption methods and hardware are turned off during sleep. During wake-up, these methods and hardware that need to maintain synchronization and communicate with their associated base stations are temporarily reverted to on. Most handheld WTRUs today include low accuracy 3 200950541 Instant Clock (RTC) in addition to the high accuracy master clock. The main clock is typically implemented using a temperature controlled crystal oscillator (TCX〇). RTC typically consumes far less energy than TCX0 consumes, which makes it desirable to use RTC instead of TCXO to provide timing functionality during DRX. Of course

There are four problems with timing using RTC during DRX. First, RTC is typically operated at significantly lower speeds than tcxo (eg, 32768 kHz vs. 76 8 megahertz). Second, the frequency accuracy of the RTC is very low compared to the frequency accuracy of the TCX〇. Thirdly, due to different environments such as temperature changes, the frequency shift of the hop is greater than the frequency shift of tcxo. Fourth, RTC typically operates asynchronously with TCX〇. For these reasons, the typical RTC in the DRX_ is not sufficient to provide the timing function separately. [Summary of the Invention]

[Embodiment] As used herein, the name "wireless transmission/reception single open"

There is no green Wei under the slogan. The 'WTRU' includes but not limited to, the pager, or the name "base station" includes 200950541 but is not limited to a B_node, a base station controller, a pick-up point, or a type of contact surface device in a slotted environment. Although: "The specific embodiments are explained in conjunction with the third generation of macro (3GPP) systems, they can be applied to other wireless systems. According to this (4) force rate and high accuracy, the face type is closed and used in conjunction with the sleep __ algorithm (4) generation low recognition and scale correctness. Long battery life can be achieved by using a low-profiled seam H. Typically, low

m power and low accuracy vibration (4) operate at higher power and high accuracy oscillators at a lower frequency order. For example, in a specific implementation, the low-power clock RTC operates at an industrial standard of 32.768 kHz, which is reduced in speed compared to high-power and high-accuracy oscillators. While the use of RTCs for handheld WTRUs is common, this embodiment provides the ability to operate in sleep mode using RTC. The sleep timer (ST) algorithm is used to perform DRX timing and allows the primary TCX to be turned off. To reduce the power consumption of the standby WTRU, the TCX is stunned during DRX sleep. When the TCXO is _, the low power crystal oscillator or RTC is used to control the DRX timing until the TCX is turned back on. For this purpose, an instant clock based on an industry standard crystal or other standard clock circuit is used as the RTC. The RTC is combined with a sleep timer algorithm that overcomes the problem of RTC used in DRX mode, and the use of the sleep timer algorithm addresses both of these issues by application frequency measurement and scheduling. The RTC can be any suitable oscillator or clock, which does not change the algorithm; only its parameters are changed. The application of the invention is described in relation to DRX, which is explicitly provided for the UMTS standard. However, the present invention is applicable to WTRUs having a sleep mode that is independent of the standard, 5 200950541, for example, DRX's pro- ing and other specific embodiments of non-fresh. Fig. 1 is a flow chart showing the micro (10) operation mode of the active u and the DRX U. In the active mode u, the full communication miscellaneous represented by the communication device 13 is provided. Although there is a dependency in some communication gambling, in general, the WTRU is fully operational, actively using the TCX 〇 17 by the synchronization device μ and its device 15 is clocked. The TC that is secreted by the rtc device 18 is operable, but the communication device 13 is primarily reliant on the TCXO 17. Tian wreu is the DRX mode 12, the synchronization and timing functions are indicated by the synchronization 24 and „10 o'clock device 25 but are shown in the lowering level. The fat must be able to identify the main _ tilting material, and the record Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if if The physical components of 18, 28 are executed by the same physical device. =_式_Execution is performed by searching for the material channel, executing the cell and checking the user activity. If there is a paging, the shell, and leaving the sleep mode and entering will be The active mode of the description. The synchronous timer can control its active and DRx' component wire algorithm to enter the German ring; the sleep structure 11 algorithm includes the wire cycle component, the general system and the main == for the DRX component and With the D-like operation - in the active cycle, the energy = 1⁄4 component maintains the operation under TCX〇 and maintains the operation of transferring to rtc 200950541

The active loop component includes synchronization updates and whether the WTRU should enter the DRX mode. The WTRU is determined by the inactivity criteria of the DRX mode. Examples of criteria for entering the DRX mode include the end of the session, the inactivity of the predetermined time interval, and the prediction of the cell search activity for which no sufficient signal is located. The time interval and the predetermined number of consecutive unsuccessful cell search activities. A particular criterion is a function of the WTRU.

In a specific concrete case, the RTC frequency phasor is aged. However, RTC frequency measurements can be avoided as this can be performed at the DR component. The WTRU enters the DRX mode when the relative inactivity interval is determined by the WTRU when deciding. In the DRX component, the RTC frequency measurements are performed on a periodic basis to maintain synchronization and a decision as to whether to return to active mode. The components of Figures 3 and 4 can be implemented using integrated circuits, such as integrated circuits (ASICs), multiple ICs, discrete components, or sinks (8) and separate components that are customized for a particular application. The S 2 picture is the input and output signals used by the sleep timer algorithm (6). The clock and the DRX position length riding muscle frequency measurement 83 are calculated. The calculation 88 is then performed for both the sleep and the sleep, and the final use is performed. The number of wakeups is 93. Ταω job, TCXQ shutdown and next-page paging opportunity or synchronization update to the output of algorithm 80.交互 The interaction of the sleep timer with other receiver algorithms is shown as the square of Figure 3. The sleep timer itself is based on the _ timing method described later. The block of H controls the interaction of the timer with other Wei methods. The components include a timing manager (1), a paper circuit ι2 circuit 113, a receive filter circuit 114, a frequency estimation circuit 115, a loop waver 7 200950541 116, and a digital analog converter (DAC) 117 & TCX0 n8. A frame timing correction (FTC) circuit 121' and a master clock 126, an RTC 127, and a sleep timer 128 are also shown.

This circuit implements an algorithm responsible for obtaining and maintaining frame synchronization of the receiver. The ADC circuit 112, the AGC circuit 113, the receive filter circuit 114, the frequency estimation circuit 115, the loop filter 116, the DAC 117, and the TCXO 118 form a frequency estimation loop m. The timing manager 1U, the aqc circuit 112, the AGC circuit 113, the receive filter circuit 114, and the FTC circuit 121 provide a frame synchronization loop 132. here

In a particular embodiment, sleep timer 128 receives signals from master clock 126 and RTC 127, which ultimately provide signals to turn TCX 〇 118 on and off. The input system is as follows: 1) the master clock (MC) has a nominal frequency of 76 8 megahertz (2 〇χ chip rate); and 2) the RTC has a nominal frequency of 32,768 Hz. The control aspects are as follows: 1) in frame mode # DRX cycle length is provided as input to the algorithm; 2) the next event is a binary block or a synchronized update block of the binary input; and 3) 〇 Starts with the first MC pulse of PO. The round is as follows. i) tcx 〇 shutdown shows TCX 〇 power should be ^ ^ off time '2) TCX 〇 boot display tcx 〇 power on time in RTC pulse mode; and 3) next - P 〇 or Synchronous update location: According to the considered paging block, the next wake-up time can be p〇 or synchronized update period. This output shows the beginning of these events in MC pulses (2 晶片 chip rate). 2 _ _ _ the operation scales performed to find the paging channel, execute the cell and then B = set and check the user activity 'If there is a paging, the WTRU leaves the sleep mode "second mode". The cell is then selected as the paging block. A continuous method of measuring the strongest cells at any known time, as shown in Figure 4. Ο ❹ 200950541 D_二二丄, the sleep timer is in minutes, the first part is RT "key pants # two different The new time interval operation, 1-in the amount of this shoulder algorithm part in each synchronization before the DRX yue ring operation, play into

_ 'This part is considered to be a very computationally efficient algorithm in DRX r, although in the particular instance shown by == =, the frame offset is followed by the synchronization update period = step update block 164. A series of beer blocks (7) are indicated by the second RX pre-fine 181_183, which is generally preceded by other activities such as paging blocks 172, 173 or synchronous update block 164. During sleep, such as sleep Moongate 91 is before the preheating period 181-183. The synchronization update period 162 precedes the synchronization update block 164. The RX-preheating is a parameter for opening the TCXO about 5 milliseconds early to make the TCX〇 preheat 'which is approximately equal to the MC (2QX) pulse at 5 filaments, and the number of pulses in this embodiment is set to 384,000. . DRX intends to identify periods of relative inactivity that provide opportunities to conserve power by shutting down various panel components of WTRu and entering "sleep". The WTRU is informed of the timing at which it must wake up to receive the transmitted data. The DRX is used in the idle mode and the connection mode for the cell_PCH and URA-PCH states of the connected mode. During DRX, when a command is set by rrC (Radio Resource Controller) based on system data, the WTRU must wake up at p〇s. 9 200950541 P0 shows the start of the paging block. For each of these steps, the RRC is responsible for scheduling when, how long, and which channel layer 1 must listen to. The time difference between two POs for a particular WTRU is called the DRX cycle length. A PO corresponds to a paging block. The paging block consists of a number of frames and contains: 1) a paging guidance channel (PICH) block consisting of 2 or 4 paging guides (Pis) frames; 2) by 2 a gap period consisting of 4, or 8 frames, where the physical resources can be used by other channels; and 3) a paging channel consisting of frames of 2 to 16 paging contents of one to eight paging groups (PCH) ) Block.

When using DRX, the WTRU has been provided to monitor only one PI in a PO per DRX cycle, and the timing diagram of the paging block is shown in Figure 4. The drx cycle length can vary from 8 to 512 frames. For example, in idle mode, the DRX cycle length may be 0.64, 1.28, 2.56, and 5.12 seconds, and in the cell/ura PCH state, the possible DRX cycle length is 0.08, 0.16. 0.32, α64, 128^2 56 and 5.12 seconds. During DRX, the WTRU should periodically update its frame and timing synchronization to be able to successfully read Pis and perform cell reselection measurements. Therefore, the periodic activities of Layer 1 include cell reselection and related measurements, monitoring PIs, and maintaining frame and timing synchronization. . If the WTRIH detects that it is paged via the associated port, it reads the pCH to access the paging content, otherwise it returns to sleep.菪 TCJ into the fascination /, „ Η 僻 僻 僻 电源 电源 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 The number of wake-ups for TCXO is scheduled for the beginning of the 200950541 or synchronization update. The power consumption of the RTC is typically insignificant compared to Tcx〇, which is at 3 amps from a 3 volt DC supply or 3.0 milliwatts. The use of RTC is accompanied by three problems. First, the resolution of the RTC does not meet the requirements of some wireless systems. For example, the Broadband Division Multiple Access (W-CDMA) Time Division Duplex (TDD) mode RTC has a typical frequency of 32,768 Hz. This corresponds to a minimum resolution of 3〇52 microseconds or 1Π.19 wafer or 2,343.8 20X samples (76 8 megahertz). The second problem is the frequency quasi-hybrid of the RTC, and the operating frequency of the RTC is different. The gap is as much as the maximum deviation of one millionth. Thirdly, the frequency stability of r= is low. The jg is the same, assuming that Yulin will be more than [+/_] 〇 3 parts per minute or _5 parts per million is faster per second. This frequency shift rate is typically room temperature. The worst case of the body oscillator (RTXO), which uses specially cut crystals due to poor temperature sensitivity. Because these vibrators are not as special as the TCXO, they are less expensive. Part: Muscle Freshness_ and Sleep Timer Schedule Frequency Measurements are periodically performed during the DRX cycle to overcome frequency accuracy and frequency stability issues. The scheduling portion meets the WTRU's resolution requirements to accurately schedule when the TCXO is turned off. DRX event. No frequency correction is required for RTC. 'The frequency must be accurately measured only ^^ In the active connection mode, RTC frequency measurement is not required. Since it is always ON, the RTC frequency measurement is only before the _ job and during the DRX period.

For what you want. More God should make _ turn the county about (U million points - sleep timer 11 algorithm and timing administrator function interaction _, next - PO 11 200950541 or synchronized update output identification and wake up after p〇 or Simultaneously update the start of the simultaneous timing administrator MC pulse. The P〇 of the timed administrator starts inputting the P〇 after the wakeup is recognized to the sleep timer algorithm, and if the FTC changes the frame timing after the synchronous update, the indication is The PO start time is related to the updated timing. The sleep time is compared to the instant clock frequency measurement and the sleep timer is adjusted with respect to the instantaneous clock frequency measurement. FIG. 5 is a timing chart of the RTC frequency estimation window according to the present invention. In order to accurately measure the number of RTC fresh master clock Π, the time _ 272 is calculated. The main clock is 76 8 megahertz _ frequency, which is the fox = chip rate, because this clock is phase locked to TCX 〇, its The worst accuracy is 〇 1 part per million, because there is no correction to Rtc ' tcxo accuracy will not affect RTc f rate measurement accuracy 'results' RTC frequency measurement accuracy can be increased by increasing frequency estimate о size Want to increase RTC for G1 parts - tearing (four) million of the main clock _ pulse 271. When selecting this frequency estimation window length is 4〇% RTC pulse ("tics"), its nominal RTC to 32,768 Hz The frequency and the main clock frequency of (10) megahertz include =〇, 〇〇〇Mc pulse. The start and end of the frequency estimation window are all counted by the pulse (7) ' 'Rtc pulse power start MC pulse count. In Dina rush 271 The beginning of the 'Mc count stops, and uses the Mc counter value to estimate the frequency of this lion to correct 1 rotation for about 125 milliseconds or 13 tilt boxes, in the wire connection mode, the frequency measurement ^ executes 'except only before entering the 駆 cycle. In this case Peaks 2 and 1 are placed anywhere in the most S-view box before entering the DRX cycle. The DRX cycle _ 'frequency measurement is performed during each synchronization update period: 12 200950541 Frequency measurement and processing should be synchronized The last 13 frames of the period occur, allowing the TCXO to have the maximum possible time to determine. The updated frequency estimate is used for the next paging block.

Regarding the sleep timer schedule, Figure 6 is a timing diagram showing the sleep timer schedule. The sleep timer determines the next-wake time of the two cycles of each DRX cycle; and the time after the next-PO or the next-synchronized update block starts 'whatever is the next event' ( The specific MC pulse) is used to locate and event 'in the absence of ΧΟ — - the amount of paste and the method of Xu Xiang to apply a simple calculation method. A timing diagram of the event is shown at the bottom of Figure 6. TIC A : The first RTC Tic after ΡΟ. TIC b=brtc : RTC tic of boot TCXO, Brtc sets the number of RTC tics starting from p〇 (each sync update calculated < DRX job length change TICC=Crtc: used to locate the next one; p〇 or Synchronize the RTCtic during the DRX start of the update block (each synchronization update is calculated). _^Enough: Zhao (10) number indicates the current PO of the frequency estimation window to the next event cycle length with different values, DRXP. This parameter indicates the distance from the frame, which is provided in Table 1 based on the next event input and DRX.

Kmc · degree list). Number of MC (20X) pulses per DRX (for all pro-cycles)

K

RTC

: The number of RTC pulses used during frequency estimation' is set to 13 200950541 4096.

Mmc: The number of measured MC pulses in the RTC frequency estimation window (measured during each synchronization update). AMC: Number of measured MC pulses from the beginning of the current PO to Tic A (measured per DRX cycle).

Brtc: The TCXO wake-up time expressed as an RTC pulse before the start of the next PO or synchronization update block, which is approximately equal to 5 milliseconds (expressed as 164 RTC ties).

Cmc: Number of calculated MC tics starting from CRTC (TicC) to the next paging block or synchronization update block 'The start of the cMC pulse and the beginning of the first chip of the next paging block or synchronization update block almost Simultaneously. At the beginning of each paging block, the next wake-up time is calculated, which can be done as follows: 1) measure the number of MC pulses from PO to the next RTC pulse (TIC A) ' AMC; 2) find DRXp from Table 1; And 3) Calculate BrtC, Crtc, and Cmc using the equations in the equation. Figure 7 is a flow chart of the tCX〇 shutdown procedure during DRX. After the paging block starts (step 301), it is measured Amc (step 3〇2), then calculated for Brtc, CRTC and CMC (step 3〇3), and these calculations are followed by reading piCH (step 304)' followed by Decide whether the indicator (ρι) is positive (step 3〇5). If ρι is positive, the WTRU is called or is changed by Β(χΉ^, so if pi is positive The WTRU will read the PCH channel to find out what the positive value is. If ΡΙ is positive, 'PCH is read (step 3丨i), and whether the data read from the PCH indicates paging or BCCH correction The decision (step 200950541 312). If the data read from the PCH indicates that the paging or BCCH correction is as determined in step 312, TCX0 maintains the operation, or the DRX mode ends (step 313). If the PI is not positive, If it is determined in step 305, or if the PCH does not indicate that the paging or BCCH correction is determined as determined in step 312, then a decision is made as to whether the current page is synchronized with the current update (step 321), if the current p〇 is correctly followed Synchronous update, the method waits until AFC and TFC converge (step 322), and when AFC and TFC converge Determine whether the distance from the AFC/TFC convergence statement to the start of the next event is greater than 1 frame (step 323). If the distance from the AFC/TFC convergence statement to the start of the next event is greater than 1 frame, then TCX〇 The shutdown and DRX modes continue (step 324). If the distance from the AFC/TFC convergence statement to the start of the next event is no more than one frame as determined in step 323, the TCXO maintains operation but the DRX mode continues. The PO does not follow the synchronization update, as determined in step 321, the proximity search measurement is performed until completion (step 341), and a decision is made as to whether the distance from the current p〇 to the next synchronization update is less than 17 frames (steps) 342), if the distance from the current P〇 to the next synchronous update is less than 17 frames, the TCXO is turned off and the DRX mode continues (step 324), if the distance from the current p〇 to the next synchronous update is not If the frame is less than 17 frames, the TCXO maintains the operation but the DRX mode continues. In operation, the next sleep timer event is scheduled TCX〇, which is outlined in the flowchart. As seen in the flowchart, each DRX cycle has three One Post-scheduling conditions: l) TCXO is turned off, the WTRU maintains the DRX and applies the sleep timer algorithm; 2) TCXO maintains operation and WTRU dimension 15 because of the conditions shown in the flowchart, 200950541 is used in DRX' TCXO and unused sleep timer algorithms '· and 3) TCXO maintains operation and the WTRU must leave DRX. In this case, the WTRU has been paged or BCCH correction data is present. Table 1 DRXp is longer than the next event DRX period (frame) Next event DRXP (frame) 32 ' 64 ' 128 ' 256 ' 512 paging block DRX cycle length _16 Synchronization update block DRX cycle length 〇 paging area Block DRX cycle length synchronization update block N/A(*) (*) As explained above, TCX〇 is powered on. The last step of the method is the wake-up of the next event. The wake-up method is as follows: 1) At time Brtc turns on TCXO 'Brtc in the last one until time CRTC; 3) calculates the Cmc main clock pulse from CRTC "; in the main clock pulse, the time is approximately the next event, that is, the next thing

The H and 5) of the first time domain of the device repeat the method of each cycle until the WTRU leaves the DRX cycle. An advantage of the present invention is that it implements a very simple method which avoids the need for real corrections to be controlled by varying the length or the clock frequency. This simple filament does not correct the accuracy clock but the fact that only its frequency is not corrected by the method embodiment. 16 200950541 [Simple description of the diagram] = The graph shows the flow of the deletion operation in the operation mode of the active 11 and DRX12. The figure shows the input and output signal block diagram used by the sleep °10 processor algorithm. The =3 diagram is a block diagram of the interaction between the in-sleep timer and other receiver synchronous algorithms. Figure 4 is a timing diagram of Layer 1 processing. Figure 5 is a diagram of the RTC frequency estimation window. Figure 6 is a timing diagram of the sleep timer scheduling event. Figure 7 is a flow chart showing the steps of shutting down the vibrator during DRX. [Main component symbol description] DAC digital analog converter FTC frame timing correction circuit PCH paging channel PICH paging guidance channel RTC instant clock TCXO temperature control crystal oscillator DRX discontinuous reception MC master clock pi paging guidance PO paging opportunity WTRU wireless transmission / Receiving unit Tics pulse

Amc measured from the beginning of the current PO to Tic A] number of VIC pulses (per-

Measured by the Brtc DRX cycle). Before the start of the next PO or synchronous update block, the TCXO wake-up time represented by the RTC pulse 17 200950541 is approximately equal to 5 milliseconds (expressed as 164 RTC tics) 〇

The number of calculated MC tics from the CRTC (Tic c) to the next paging block or synchronous update block, the beginning of the CMC pulse is almost simultaneous with the beginning of the first paging block or the first wafer of the synchronous update block. DRXP This parameter indicates the distance from the current p〇 to the next event in frame mode, which has different values depending on the next event input and the length of the DRX cycle. These values are provided in Table 1. The number of MC (20X) pulses per KX during KMC (listed for all DRX cycle lengths). The number of RTC pulses used by the KRTC during frequency estimation, which is set to 4〇96.

Mmc is the number of measured MC pulses in the rtc frequency estimation window (measured during each synchronization update). The first RTC Tic after TIC A PO. ❹

TIC B=BRTC Turn on the TCXO's RTC tic 'BRTC to set the number of RTC tics starting from P〇 (calculated for each sync update or DRX cycle length change). The TIC OCRTC is the RTC tic (calculated for each synchronization update) during the DRX used to locate the next p〇 or synchronous update block. 11 Active mode 12 DRX mode 13, 23 communication device 14, 24 synchronization device 18 200950541

15 > 25 Timing device 17, 27 TCXO 18, 28 RTC device 80 Sleep timer algorithm 83 RTC frequency measurement 88 Calculating wake-up and sleep position 93 Generating wake-up times 111 Timing administrator 112 ADC circuit 113 AGC circuit 114 Receive filter circuit 115 Frequency Estimation Circuit 116 Loop Filter 117 DAC 118 TCXO 121 FTC 126 Master Clock 127 RTC 128 Sleep Timer 131 Frequency Estimation Loop 132 Frame Synchronization Loop 164 Synchronization Update Block 171-174 Paging Block 181-183 RX Pre Hot period 191 during sleep 271 main clock pulse 272 long time period 19

Claims (1)

200950541 VII. Patent Application Range: L wireless transmit/receive method (WTRU), comprising: a reference oscillator providing a frequency standard for synchronizing communication; an instant clock (RTC) configured to oscillate with respect to the reference Operating at significantly low power; * - the controller ' is configured to provide an active mode of operation and a low power mode of operation in which the reference oscillator is used, and in the low power mode of operation Using the RTC and selectively using the reference vibrator; and the controller is configured to determine the completion of a program using the reference vibrator and the next procedure requiring the reference oscillator to be used A difference therebetween controls the use of the reference oscillator during the low power mode of operation and is configured to turn off the reference oscillator when the difference in the decision is greater than a selected threshold. 2. The wireless transmit/receive unit (wtru) of claim 1, wherein the reference oscillator is a temperature controlled crystal oscillator (TCX〇) and the RTC comprises a room temperature crystal oscillator ( RTXO). 3' The wireless transmit/receive unit (wtru) of claim 1, wherein the WTRU is configured to establish a wireless communication using a formatted time frame, wherein: the controller is configured to provide Including a discontinuous reception (DRX) of a low 20 200950541 power operation mode; the reference oscillator is a power and high accuracy flasher; the control n is configured to listen to the low power mode Refer to the vibrator for synchronization update; and the controller is configured to be based on - automatic frequency control (AFQ and frame timing repair iE (FTC) convergence to determine - synchronization is finer, and for beta utilization A time frame is used as the selected threshold. 4. The wireless transmit/receive unit (WTRU) as described in claim 3, wherein the tester ー-/the degree-controlled crystal oscillator ( Tcx〇); the rtc includes a - room temperature crystal stitch ΤΧ〇); and the control is configured to use the TCX0 during the low power mode of operation in response to a paging opportunity (four) or a synchronized update. 5. If you apply for a patent scope! A wireless transmit/receive unit (wtru), wherein the control (4) is configured to perform a cell reselection measurement at the low power side using the reference oscillator 2. 6. The WTRU is configured to establish a wireless communication using a formatted time frame, as in the wireless transmitting/receiving unit (10) of claim 5, wherein: The controller is configured to synchronize the update during the low power mode of operation; and 5^21 200950541 the controller is configured to perform an automatic frequency control (AFC) and a frame timing correction (FTC) Convergence to determine the completion of the synchronization update, and to utilize a time frame as the selected threshold for the difference between the completion of the synchronization update and the next procedure requiring the reference oscillator to be used, And for the completion of the cell reselection measurement and the use of the reference oscillator to use the difference - the seventeen time frame as the selected threshold. 7. The wireless transmitting/receiving unit (wtru) according to claim 6, wherein the reference oscillator is a temperature controlled crystal oscillator (TCX〇); the RTC comprises a room temperature crystal button (RTXO) And the controller is set to use the TCXO during the low power mode of operation in response to a paging opportunity (PO). 8. The wireless transmit/receive unit (WTRU) of any of claims 1-7, wherein the wtRU is configured for use by a user of a third generation partner project) compatible system device. 9. A method of wireless communication, comprising: providing a wireless transmit/receive unit (WTRU) having a reference oscillator for synchronizing communications, an instant clock (RTC), an active mode of operation, and a low a power mode of operation 'where the parameter oscillator is used in the active mode of operation, and the RTC is used in the low power mode of operation and selectively using the reference oscillator; and 22 200950541 during the low power mode of operation Selectively turning off the P-reference oscillator by determining the difference between the π of the program using the reference oscillator and the -below program requiring the reference oscillator, and the difference in the determination is greater than When the critical value of the gate is selected, the reference oscillator is turned off. 10. The method of claim 9, wherein the temperature controlled BB body vibration l_S (TCXC) ix is provided as the reference vibrator. The method of claim 9, wherein: the wireless communication is established in a formatted time frame; the low power operation mode comprises - not receiving (DRX); the reference oscillator is at the low Used to synchronize updates during power operation mode; determine the completion of a synchronized update based on automatic frequency control (AFC) and frame timing correction (the convergence of ftq; and use a time frame after the 13⁄4 step update is completed) As the selected ® B threshold to determine the reference oscillator. 12, as described in claim 11, the towel, providing the WTRU-temperature controlled crystal oscillator (TCX0) to As the reference oscillator; and using the TCX in the low power mode of operation in response to a beer opportunity (four) or a synchronization update. 13. The method of claim 9, wherein the low power The reference oscillator is used during operation mode to perform a cell reselection measurement. 23 200950541 14. The method of claim 13, wherein the wireless communication is established by a formatted time frame. The low-power operation mode _, the side is oscillated and updated; the device performs the synchronization frame timing correction (FTC) according to the automatic frequency control (AFC) and the convergence to determine the completion of a synchronization update; (10) 峨 _ her difference between the following ones using 'a time frame as the selected threshold; and the completion of the measurement for the cell and the requirement to use the reference oscillator - down-student The coffee difference is such that the oblique __ frame is used as the selected critical value. 15. The method according to claim 14, wherein the physical vibration device (TCX〇) which provides the temperature control of Xiaoyi is provided. As the reference oscillator; and using the TCX0 during the low-power operation mode in response to a paging opportunity (p〇). The method of any of claim 9-15, wherein the wtru is Provided as a user device for the -3rd Generation Partnership Project (3Gpp) compatible system.