CN101051857B - Method and device for providing power control data in wireless communication system - Google Patents
Method and device for providing power control data in wireless communication system Download PDFInfo
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- CN101051857B CN101051857B CN2007101026051A CN200710102605A CN101051857B CN 101051857 B CN101051857 B CN 101051857B CN 2007101026051 A CN2007101026051 A CN 2007101026051A CN 200710102605 A CN200710102605 A CN 200710102605A CN 101051857 B CN101051857 B CN 101051857B
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Abstract
A power control system for use in facilitating transition to an active state suitable for use in a wireless communication system. In one aspect, the system includes a first transceiver, such as a BTS, having the ability to initiate transmission of a power control function. The transceiver comprises a generator for generating a power control arrangement and a transmitter for transmitting the power control arrangement. The system further includes a second transceiver, such as a terminal, for receiving the power control arrangement and coherently combining the power control arrangement to determine a state transition indication. The second transceiver includes a transmitter that transmits a selected waveform subsequent to the coherent combining. The first transceiver receives the selected waveform, determines a power level associated therewith, and provides feedback to the second transceiver. The power control arrangement may include groups of redundant power control data, data transmitted on idle feedback dimensions, or predetermined signal patterns in addition to at least one power control group.
Description
The application is to be application number the dividing an application for the one Chinese patent application of " the power control during the state transitions " that be the 03804031.X denomination of invention on December 4 calendar year 2001 the applying date.
Cross reference
The priority of No. 60/347592 provisional application of application number that the application requires to submit on January 9th, 2002 and transfer the assignee of the present invention at present.
The present invention relates generally to field of wireless communications systems, the power control command that relates in particular to effectively effective two-way communication carries out initialization.
In wireless communication system, the user with terminal (like cell phone) is via communicating through the down link (forward link) of one or more base stations and transmission and another user on the up link (reverse link).Down link or forward link refer to the transmission from the base station to the terminal, and up link or reverse link refer to the transmission from terminal to base station.
Such as the cellular telecommunication system of code division multiple access (CDMA) is characteristic with a plurality of mobile radio stations of communicating with one or more BTS under CROS environment (BTS) or terminal (like cell phone, mobile unit, radio telephone or mobile phone) normally.Receive the signal that sends from mobile radio station by BTS, and usually they are relayed to the have base station controller mobile switching centre (MSC) of (BSC).Alternatively, can receive the transmission of mobile radio station, and be relayed to public data services node (PDSN) through BSC by BTS.Then, MSC and PDSN pass the signal to public switch telephone network (PSTN), data network or another radio telephone.Similarly, can signal be sent to radio telephone from PSTN or data network through base station or BTS and MSC or through BTS, BSC and PDSN.
Usually will utilize the cdma system of above-mentioned communications setting to be designed to meet one or more standards.Such standard comprise " TIA/EIA/IS-95-B Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System " (IS-95 standard), " TIA/EIA/IS-98Recommended Minimum Standard for Dual-Mode WidebandSpread Spectrum Cellular Mobile Station " (IS-98 standard), provide by " 3rdGeneration Partnership Project " association (3GPP) by name and be included in the standard in the one group of document that comprises number of documents 3G TS 25.211,3G TS 25.212,3G TS 25.213 and 3G TS 25.214 (W-CDMA standard) and " TR-45.5Physical Layer Standard for cdma2000SpreadSpectrum System " (cdma2000 standard).Just continuing to propose new CDMA standard and come into operation.These CDMA standards are incorporated herein by reference.
In the general communication system such as CDMA or cdma2000, the data like voice telephone traffic are sent with minimum possible power level in correct action need terminal, to minimize the interference of terminal room.On the contrary, if terminal power level is too low, BTS just can't correctly receive the grouping that receives from the terminal and frame and to its decoding.Like this compromise needs monitoring and keeps the transmitted power at each single terminal and from the reception signal at each terminal and the ratio of noise jamming.Each terminal will reach optimum performance when sending with the minimum power that allows the correct decoding of BTS place reverse frames.
In operation, the terminal can get into some state.These states comprise idle condition (wherein the terminal can send signal to the base station or receive signal from it, but is not initiatively to send or receive), and active state (wherein the terminal is initiatively sent data, received data from it to BTS, or both have it concurrently).In these states, power that especially consumes in the active state and capacity are not minority under normal operating condition.In addition, the active state zone of use previously known is tending towards occupying the number of users of the particular channel of communicating by letter with BTS.In addition, it also is very important that the required time of active state is transferred to from idle condition in the terminal, and should the link-quality between terminal and the BTS be exerted an influence the delay meeting.Therefore; The standard that some is newer such as cdma2000, can provide the ability that gets into different conditions for the terminal; Thereby can make the additional user access channel, and power controlling use effectively simultaneously, delay, additional overhead, battery life and processing time and other parameters.For example, cdma2000 comprises that activity, control keep, static and dummy status.In these states some comprise centre or transition subpattern or the sub-state that before is not useable for the terminal, and allow to strengthen power consumption control and allow the access of further user to available bandwidth.
Control maintenance pattern is newer pattern, and it representes a state, wherein keeps special-purpose middle access control (MAC) control channel, but does not keep the dedicated control channel.Control maintenance pattern is supported a large number of users through reducing the loading of forward direction and reverse link, and helps transferring to fast activity pattern.Control maintenance pattern is an active state for control signal, but is idle for traffic, has saved the traffic power demand like this and has allowed the control signal transmission simultaneously.
In cdma2000, can be in keep the demand of mode shifts for idle sub-state that makes the terminal from still-mode (being referred to as idle condition here) or control to activity pattern through BTS transmission expression BTS to the power control signal at terminal by the fixed time period of terminal recognition.Before in this transmission cycle, the trial that power control signal is provided is limited to BTS usually fixed value is sent to the terminal, and send with the predetermined power level that is independent of distance between signal to noise ratio or terminal and the BTS at the terminal.Such arrangement causes the non-accurate power level transmission that begins at activity pattern, causes low link-quality usually, to the interference of other-end on the reverse link, and perhaps both have concurrently.Subsequently, the mistake high power levels of being sent when the terminal gets into activity pattern needs the dynamic correction (this needs system handles) in the activity pattern and poor traffic quality is provided, and this is normally undesired.On the other hand, the low-power level excessively that is sent when the terminal gets into activity pattern can cause low link-quality, and also needs the dynamic correction in the activity pattern, and these generally all are undesirable.Like this, previous power control transfer method can produce abnormal effect, interference, and satisfies in condition and to produce some delay between terminal and the BTS before the available power level.
When terminal and BTS interaction existence interference or non-useful signal transmission conditions, another power control problem can appear.For example, send during the BTS estimated signal strength at the terminal, and BTS does not receive this terminal transmission with various reasons.The failure that receives signal from the terminal can make BTS send order to increase power to the terminal.Such transmission ineffectivity can further increase sends the possibility of incorrect power control command from BTS to the terminal, and causes before suitable signal can be provided, further postponing.
In addition, shift between different conditions such as those current other available cdma systems and have similar restriction aspect effective power Control and Feedback and the enough activity pattern quality setting up.For example, the BTS in the formerly known cdma communication system can transfer to active state from idle condition in the requesting terminal, and this process is referred to as traffic channel initialization sometimes.In case BTS notifies forward link channel to the terminal, the lock-on signal from BTS is just attempted at the terminal.The signal of being caught from BTS by the terminal can comprise the combination of power control signal or power control signal and other form signals.In this is provided with, as in cdma2000, the terminal to the BTS signal obtain at a slow speed and the delay of effective power control operation begins to increase the delay that set up two-way communication, reduces link-quality and increase the interference to other terminal of using reverse link.These systems suffer a succession of characteristic of power Control and Feedback method; When terminal wait during from the indication (it need successfully be detected in the terminal) of BTS; The terminal need begin the transmission (BTS possibly not receive this transmission) on the reverse link subsequently, and BTS will be according to actual power transmission transmission power control commands (this needs the time error correction).The mutual required time of setting up the BTS-terminal like this adds that the incorrect power control command required time of correction is just considerable relatively.
Therefore this area need a kind ofly in cdma system, to shift between pattern (generally be in cdma2000 from the idle sub-state of still-mode or control maintenance pattern to activity pattern; And in the previous CDMA version from the idle condition to the active state) during the effective power control technology; It has avoided the defective of previously known; When promptly postponing terminal entering activity pattern, incorrect power delivery, and relevant interference and channel capacity limit.
Here the various aspects that disclose are through being provided for the demand that power controlling Design in the wireless communication system solves above state.This design is included between terminal and the transmitter (like BTS) and sends data with following mode; Promptly promote (, and to comprise foundation quick transmission and its effective use to the terminal power control command like the quick transfer of the idle condition of the control hold mode of cdma2000 or cdma2000 and previous cdma system to active state from inactive state.Can between two transceivers seeking the state transitions from the inactive state to the active state, use the design that is disclosed here, wherein between them, exchange power control command.In one aspect of the invention, through detecting from the existence of the power Control and Feedback of first transceiver reception, control strength of transmitted signals at second transceiver.First transceiver can comprise BTS, and second transceiver can comprise the terminal, and vice versa.The power Control and Feedback that is detected is coherently made up in this design through command window; And be included in second transceiver activation transmitter and send predetermined waveform or conventional traffic information from first transceiver to second transceiver, perhaps predetermined waveform is right after said conventional traffic information.
According to the design on the other hand; In wireless communication system, come transfering state through sending the transmission collection in the first transceiver received power control information, in the combined power control information coherently of first transceiver and after coherent combination, this transmission collection comprises at least one of predetermined waveform and conventional traffic.
The third aspect according to the design; Wireless communication system comprises first transceiver with beginning through-put power controlled function ability, and wherein first transceiver comprises and is used to the transmitter that produces the generator of power control setting and be used to send this power control setting.This system further comprises second transceiver, be used for the received power control setting and coherently the combined power control setting confirm to shift indication.Second transceiver sends selected waveform after coherent combination, and first transceiver receives selected waveform, confirms relative power level and to second transceiver feedback is provided.
In the design's fourth aspect; Through comprising the data of power control information and data that coherent combination is received with the preassigned pattern reception and confirming existing of power control command, confirm the existence of power control command in the wireless communication system according to the data of correlation combiner.
Following further detailed description, the present invention further provides the method and other element that realizes various aspects of the present invention and characteristics.
Through following detailed description and combine accompanying drawing, it is more obvious that characteristics of the present invention, characteristic and advantage can become, and wherein all similar labels identify corresponding element, wherein
Fig. 1 is the sketch map of spread spectrum communication system, this system support a plurality of users through with the communicating by letter of the mutual remote terminal of group of base stations;
Fig. 2 is the mutual rough schematic view of terminal-BTS;
Fig. 3 is the sketch map that transmits with the gating rate of 800bps and 1 on Forward Power Control Subchannel and the Reverse Pilot Channel;
Fig. 4 is the sketch map that transmits with the gating rate of 400bps and 1/2 on Forward Power Control Subchannel and the Reverse Pilot Channel;
Fig. 5 is the sketch map that transmits with the gating rate of 200bps and 1/4 on Forward Power Control Subchannel and the Reverse Pilot Channel;
Fig. 6 is the sketch map that transmits with the gating rate of example 1/4 according to a first aspect of the invention;
Fig. 7 is the sketch map that transmits with the gating rate of example 1/4 according to a third aspect of the invention we;
Fig. 8 is the operational block diagram of first aspect present invention;
Fig. 9 is the operational block diagram of second aspect present invention;
Figure 10 is the operational block diagram of third aspect present invention.
Definition
Here the subscriber station that is referred to as terminal or mobile radio station can be to have any moving or static distant station in the system (like the cdma wireless communication system) of power control.Subscriber station, terminal or mobile radio station can communicate with one or more base stations (being referred to as base station transceiver (BTS) here).The terminal receives packet through one or more base station transceivers to base station controller (BSC) transmission and from it.Base station transceiver and base station controller are the parts of network.Network can be connected in network outer additional firmware and system, like PSTN, intranet or internet, and can each access terminal and such external hardware or system between voice signal or packet.Setting up terminal that active traffic channel is connected with one or more base station transceivers is referred to as active terminal or is called and be in trafficwise.The terminal can be through wireless channel or any data equipment of communicating through wire message way (as using optical fiber or coaxial cable).The terminal can be any of polytype equipment in addition, includes, but are not limited to PC card, standard flash memory card, outside or internal modems, perhaps mobile or fixed line telephone.
As reach here and be applied among the cdma2000, term active mode or active state refer to a kind of like this state of terminal, are wherein keeping dedicated traffic and DCCH.Term control maintenance pattern or control hold mode refer to a kind of like this state, wherein keep the MAC control channel, but do not keep the dedicated control channel.Term idle mode or idle condition refer to the specific sub-state of inactive state, and wherein inactive state is the state at terminal, wherein do not keep any dedicated logical channel.In the idle sub-state of inactive state, the user can receive short data string and the transmission of request short data string.The application's general discussion is from the idle condition to the active state and from controlling the transfer of hold mode to the cdma2000 of active state.
As be applied in any CDMA agreement except that cdma2000, term active mode or active state are indicated a kind of state, and wherein initiatively send, have both at the same time from BTS reception data or both to BTS in the terminal.Term idle mode or idle condition are indicated a kind of state, and wherein the terminal can receive signal to the base station transmission or from it, but does not initiatively send or receive.In idle pulley or idle condition, the terminal can receive data and handle the information that receives on this channel on the PCH.
Here some channel of mentioning is based on cdma2000 Release C standard (it is incorporated herein by reference), includes, but are not limited to forward power control channel, Forward Common Signaling Channel, common forward link power control channel, packet dedicated data control channel and special-purpose or shared Packet Data Channel.Here can use the additional or different channel that has identity function for purpose described here.
System operation
Fig. 1 is a sketch map of supporting a plurality of users' spread spectrum communication system 100.System 100 provides the communication for a plurality of sub-districts, and wherein each sub-district is by relevant base station 104 services.Through system's each remote terminal 106 of distribution.Each remote terminal 106 can be to send data and/or receive data and whether be in soft handover and communicate on forward direction and reverse link with one or more base stations 104 according to it according to it in any particular moment.As shown in Figure 1, base station 104a and remote terminal 106a, 106b, 106c and 106d communicate, and base station 104b and remote terminal 106d, 106e and 106f communicate.
In system 100, system controller 102 is coupled in base station 104, and also can be coupled in MSC, and is coupled in PSTN and/or PDSN again.System controller 102 is coordinated each base station that is coupled in it and is controlled.System controller 102 is also controlled in the remote terminals 106 and the data between remote terminal 106 and the PSTN (like black phone) or the route of call through base station 104.For cdma system, system controller 102 also is referred to as base station controller (BSC).
For number of C DMA system, the communication between specific remote terminal and the one or more base station is normally discrete.Remote terminal only receives data in some special time cycle to the base station transmission or from it usually.In cycle remaining time, remote terminal is " inactive " and receive pilot signal from BTS only.
As stated, on the reverse link of cdma system, can become the interference of other active remote terminals and influence the performance of these remote terminals thus from the transmission of each remote terminal.For the performance of improving remote terminal and improve power system capacity, the transmitted power of controlling each remote terminal is low as much as possible, still keeps the performance of sending the remote terminal specified level simultaneously to reduce interference volume.
Terminal-BTS is provided among Fig. 2 mutual reduced representation.In above-mentioned wireless communication system, BTS104 begins to attempt to set up the two-way communication with corresponding terminal 106.BTS104 begins the transfer from the idle condition to the active state at this moment terminal, and on reverse link, sends traffic subsequently to the indication of terminal transmission " waking up ".Formerly in the system, under the normal operating condition, BTS104 can send forward link signal (normally time-event) to terminal 106, and this terminal can obtain this forward link signal before the beginning rl transmission.In some existing system (including, but are not limited to cdma2000 Release C), the transmission that the initial forward link of BTS104 " is waken up " is the signal that only comprises the signal of power Control and Feedback data or have control Control and Feedback part.
In case terminal 106 receives " waking up " signal, it begins the transmission on reverse link.BTS104 receives rl transmission and carries out control function of power, and the signal quality of this functional measurement 106 receptions from the terminal or signal are to noise and interference ratio.BTS104 has determined whether that enough signal to noise ratios (Eb/No) are available, and to terminal 106 transmission power control feedback command, wherein uses these orders to regulate the signal transmitting power level at terminal 106 by terminal 106.
When terminal 106 when BTS104 receives " waking up " and transfer to the order of active state, it just is in particular state.Previous cdma system receives " waking up " order when using idle condition and terminal 106 to be in idle condition.Some cdma system allows to be different from idle with movable state.In cdma2000, terminal 106 can be in " free time of modification " state, is called the control hold mode.Here " free time of modification " state refers to following situation, and promptly terminal 106 can be used for receiving and sending signal, but the current lasting signal that sends and receive with BTS104.Yet in control kept, some information is sent and received in the terminal through particular channel (like pilot channel), and this is the modification to the idle condition that provides in the previous system.
For cdma2000, any possible feedback channel, time slot, frequency or other units that is sent by BTS activated power control measurement and the feedback mechanism of BTS104.In other words; When terminal 106 is in free time or control hold mode; BTS104 has rated output control signal and the ability that the power Control and Feedback is provided; And BTS has the ability that data are provided at particular time-slot, even BTS does not initiatively receive voice or data traffic to terminal 106 transmissions or from it.This also is different from previous cdma system.
The design generally comprises the transfer process of modification, more effectively to transfer to the final operation transmission based on the mutual power control command of effective traffic between the power signal that records and terminal 106 and the BTS104 from initial " waking up " indication.Though this description proposes the specific aspect of this design, is appreciated that the present invention can be used for any system that comprises transceiver, wherein solicited status shifts and provides the power Control and Feedback.In such double receiver-transmitter was provided with, a transceiver detected the signal indication that other transceivers of indication need carry out the purpose of state transitions at the beginning.After receiving these index signals, first transceiver begins to go up transmission at suitable communication link (being forward direction or reverse link).Second transceiver receives signal on communication link, and the transceiver that carries out power control begins transmission power control commands, particularly increases or reduce the order of power delivery.Specified point (when receiving first power control command or ignore power control command after a period of time); Receive the transceiver of power control to begin to use increase or reduce power command, and another transceiver will appreciate that the signal that is sent is based on the actual power of being done by the transceiver that carries out power control and measures.
In an embodiment according to cdma2000, BTS104 requesting terminal 106 is transferred to active state or is transferred to active state from the control hold mode from idle condition.When BTS104 request is shifted and terminal 106 when being in idle condition, BTS104 just sends to terminal 106 on Forward Common Signaling Channel and shifts indication, shifts wherein that to indicate can be the signaling message form, is generally the 3rd layer of message.Times prior simultaneously or slightly, BTS104 sends forward link signals in dedicated forward channel or subchannel to terminal 106, and this signal is sent to terminal 106 with Transfer Message or some other forms.Dedicated forward channel or subsignal transmission can comprise some power control bits that sends in the subchannel formation part of common forward link power control channel, packet dedicated data control channel or special-purpose or shared Packet Data Channel as power control group.Terminal 106 receives shifts indication and begins to detect the forward link power control bit that is sent and other signals that sent by BTS104.Before sent through reverse link at terminal 106, power control bits, order or the feedback of being sent by BTS 104 were not any signal based on 106 receptions from the terminal, and they normally need terminal 106 to increase the order of power.Because the signal of reverse link is zero to noise and interference ratio basically, BTS just sends the order that increases power.Before 106 places, terminal catch forward link, simultaneously or afterwards, the terminal begins on reverse link, to transmit, and BTS104 attempts to detect and catch this reverse link.Simultaneously terminal 106 send voice, data traffic, above both or some are for his prearranged signals.BTS104 awaits voice traffic or some other prearranged signalss, in a single day and receive traffic and signal, the power control mechanism of BTS104 just calculates correct power Control and Feedback order and begins to send useful feedback command to terminal 106.Useful feedback command refers to the feedback command based on the actual signal strength measurements of BTS104 on reverse link.Terminal 106 uses these useful feedback command to regulate the terminal transmission power level.
If active state will be transferred to from the control hold mode in the terminal; BTS104 just sends the transfer indication at Forward Common Signaling Channel or Forward Dedicated Signaling Channel to terminal 106; Wherein shift indication and comprise that some power control bits that on subchannel, sends as power control group, this subchannel are the parts of common forward link power control channel, packet dedicated data control channel or special-purpose or shared Packet Data Channel.Terminal 106 receives this transfer indication and detects the power control bits that is sent, and BTS104 catches reverse link simultaneously.At this point, power control bits, order or feedback are not any signal based on 106 receptions from the terminal, and they still need terminal 106 to increase the order of power usually.Terminal 106 is caught forward link and is begun to send voice telephone traffic or some other prearranged signalss.In a single day BTS104 waits for reception voice telephone traffic or other prearranged signalss, and receives signal, the power control mechanism of BTS104 just calculates correct power Control and Feedback order and begins to send useful feedback command to terminal 106.Terminal 106 uses these useful feedback command to regulate the terminal transmission power level.
When being in idle condition or control hold mode and BTS104, terminal 106 sends signal so that it is when transferring to active state to this terminal; Does not send to BTS on reverse link at terminal 106, but on the Forward Power Control Subchannel of distributing to terminal 106, monitor all power Control and Feedback from BTS104.The existence of the power control group of on Forward Power Control Subchannel, sending is detected at terminal 106, and coherently makes up the feedback signal that is received through power control command window (suppose that these orders all are identical contents, promptly increase signal transmitting power etc.).Under general environmental condition, when being in idle condition or control hold mode, any signal can not sent to BTS104 in terminal 106, and BTS104 can be to terminal transmission power control feedback command yet.Yet, if there is the order that begins to communicate by letter from BTS, will these power control groups be sent to terminal 106, clearly indication is provided: have from BTS104 to the terminal 106 dedicated forward link.If 106 signals that receive from the terminal not, BTS104 will send the order that increases signal transmitting power by most probable to the terminal.Terminal 106 combined power Control and Feedback and strengthen the judgement of the 106 pairs of forward link special signals in terminal, the especially how judgement of power Control and Feedback order coherently subsequently.
The coherent combination of feedback signal is compared the reliability that has strengthened initialization procedure detection (being also referred to as energy measuring) with the reliability of incoherent combination.The reliability that strengthens is to keep fixing error probability (Pm) and fixing decision delay (DD) simultaneously owing to increased detection probability (Pd).Alternatively, coherent combination has reduced Pm and Pd and DD fix with respect to the irrelevant combination of order, perhaps reduces DD and Pd and Pm fix, perhaps increase Pd and reduce Pm to reduce DD simultaneously, and perhaps be its combination.
When terminal 106 detected from the existing of the power control group of BTS104, terminal 106 was just activated its transmitter 204 and is attempted beginning to send predetermined waveform or conventional traffic in response to the initialization that receives from BTS104, is right after conventional traffic after the perhaps predetermined waveform." conventional traffic " is widely used, and it comprises any other traffic of calling out initiation protocol, service information transfers, voice-and-data transmission or generally being used for wireless communication system environments.Because the BTS104 power control mechanism was started working before its transmitter is activated at the terminal, therefore BTS receiver 202 catch self terminal 106 transmission time and in fact postpone existence at BTS104 between the actual time that produces and carry out power control at terminal 106.Should be scheduled to waveform, conventional traffic or its combination by the BTS104 measurement, with further generation power control command.In case terminal receiver 206 detects the transmission from BTS, two way voice communication just can begin.
For cdma2000, forward link power control subchannel carries from BTS104 to the terminal 106 power control group.Fig. 3-5 shows some gated mode of cdma2000 control hold mode.There are other gated mode and use different gated mode also within the scope of the invention.Forward direction and reverse power control subchannel transmit timing that Fig. 3 shows gating rate 1 and transmits with 800bps.On the forward link, the content of power control transmission is predetermined and regulation has specific format and content, and the fixed mode of promptly not measuring based on reverse link is like the multicycle transmission of fixed value.The terminal has on reverse link the ability of using Reverse Pilot Channel or Reverse Dedicated Control Channel and BTS to communicate, and the terminal on reverse link with shown in pilot signal transmitted 301 and power control bits 302 be set.When terminal 106 when idle condition is transferred to active state, all power control commands that are exclusively used in terminal 106 on the forward link are that the detection at terminal 106 provides signal energy.When terminal 106 is in the control hold mode, the not free transmission plan that additional signal is provided on forward direction or the reverse link that is used in.In Fig. 4, the gating rate is 1/2 and receives with 400bps.This timing is providing on the reverse link at interval on forward direction and reverse link, to comprise additional data, like the secondary power control data.Fig. 5 shows the gating rate to be 1/4 and to carry out the reception of Forward Power Control Subchannel with 200bps, wherein also has the additional period of power control command with external power control sub-channel except the power control group of normal transmission.In some CDMA environment, the gating rate of use 1/4 is favourable for the interference that reduces terminal room on the reverse link, therefore general 1/4 the gating rate of using.
For the transmission of all forward links and reverse link, should notice that the transmission of pilot signal 501 and power control bits 502 is squinted with respect to the transmission of related power control group on the forward link in time.Like this, forward link carries power control group a time interval, and Reverse Pilot Channel after time carry pilot signal and power control bits.
The initial forward link transmission that BTS104 carries out when initialization terminal 106 can be identical shown in the forward link of Fig. 3 part.This free time in the transfer of activity, on the one hand, 106 catch forward link special signal (power control sub-channel) and do not send at reverse link before at the terminal.On the other hand, terminal 106 began the transmission of reverse link before catching dedicated forward link channel or subchannel.Reverse link can be with shown in Fig. 3 identical.
In this one side of the design, the operation as shown in Figure 6 of the forward link of power control sub-channel is with predetermined gating rate and time interval transmission power control group.For shown in realize that the control function of power of BTS104 is opened also beginning in a time period measurement reverse link pilot channel.When terminal 106 was in free time or control hold mode, BTS104 did not receive any transmission on reverse link pilot channel.BTS104 is not used in usually on the forward link in the power control group of transmission and sends energy subsequently, the indication of opening active states and beginning to transmit as terminal 106.Terminal 106 receives these orders and knows that it does not also coherently make up them with the formation compound command sending, collect this transmission, as through calculating the quadratic sum of received energy in the different capacity control command on the forward link.Noise and environmental effect can influence the information quality that terminal 106 receives.
For example, BTS104 transmission power control group PCG1-PCG4, as shown in Figure 6, each power control group has amplitude+1.0, wherein+the 1.0th, the order of rising, and the-the 1.0th, order descends.Because channel disturbance, terminal 106 receivable actual read number are 0.5,1.5,0.0 and 1.2.The quadratic sum of each reading can be calculated in the terminal, obtains (0.5)
2+ (1.5)
2+ 0
2+ (1.2)
2=3.94, adjudicate this subsequently and whether enough approach ideal value 1
2+ 1
2+ 1
2+ 1
2=4, whether exist to adjudicate this signal.The terminal calculate alternatively these readings and square, obtain (0.5+1.5+0.0+1.2)
2Or 10.24, it is with respect to there not being signal (0) more to approach ideal value (16).This in a big way (0-16 in this example) aim to provide the improved reliability that more becomes than scope 0-4.In addition, use a plurality of power control groups to strengthen the reliability of the reading that calculates by terminal 106.Can use and add up and square technology, and the collected reading and this result carried out square usually wider and better reliability can being provided of adding up.This programme comprises transmission and the reception of power control group PCG1-PCG4, and it does not send in original technology, but sends aspect this of the present invention, thereby has improved the quality of received signal.
Time point is known in terminal 106 when beginning is sent on reverse link.Know the time that it begins on reverse link, to send, add the delay of knowing between rl transmission and the corresponding forward link power control command, the time of accomplishing for testing goal hypothesis " all rise " just can be calculated in terminal 106.After the power control command corresponding to the reverse link PCG that is sent arrives, just can not suppose that order all is " rising " order.The terminal can be finished its " all rise " assumption period and received and use power control command accurately relatively apace like this.
The coherent combination of (in the control hold mode) power control group of (in idle condition) of in the testing process at terminal 106, before not sending or redundancy makes the terminal increase the probability that initially detects; And/or reduce wrong probability, and/or reduce the decision delay in the single power control group transmission.The terminal can receive the initial indication that increases power, and as in aforesaid scheme, BTS104 still sends the open Loop Power control order, and it is similar to the order that increases power.This initial command is handled through ignoring lasting one period set time of data in terminal 106, and perhaps BTS sends and is different from the order that increases power, as keeping current power or increasing the level that power is less than full interval.So just reduced the time cycle that BTS104 waits for " waking up " in terminal 106, and the terminal spends in " waking up " and receives and the time of beginning voice telephone traffic need not to satisfy the demand that BTS begins the measuring terminals transmission power level.
From the terminal 106, terminal 106 has power control group regularly or the priori that postpones, and it just has definite power control group validity and discern BTS104 and begins the ability of communicating by letter and attempting like this.Terminal 106 beginning is subsequently sent on reverse link and by the BTS104 transmission power control commands.Terminal 106 is ignored the power control command that received and is continued a period of time because this order can not based on from the terminal 106 send to BTS104 actual signal to noise ratio.The time cycle of terminal disregards power control command can be the order of magnitude that transmission delay adds BTS104 place expectation processing delay.In the time cycle of terminal disregards BTS transmission, BTS104 catches reverse link, calculates and begin according to the signal strength signal intensity that is received and send effective order according to true the measurement.In the time cycle of terminal disregards power control command, the coherent combination of previous described detection and signal is not carried out at terminal 106.
Above description relates generally to that in a single day the terminal detects forward link and the initialization on reverse link, transmitted.Attempt to begin to communicate by letter with BTS104 alternatively in terminal 106.Under these circumstances, BTS104 detects the power of reverse link control command through above-described coherent combination.In operation, when terminal 106 was wanted to set up with the communicating by letter of BTS104, it sent the power control command of predetermined sequence on reverse link.BTS receives this power control command sequence and they is carried out coherent combination to confirm whether the terminal seeks to begin communication.In case BTS104 confirms that through coherent combination terminal 106 seeks to begin communication, it just attempts to set up on the forward link communication, unlatching control function of power and begin transmission power control commands on the forward link so.In case set up the communication of forward link, BTS104 and terminal 106 have just begun two-way communication.Terminal 106 is ignored the power control command that is received alternatively and is continued a period of time.
The design's operation can be similar to above-described mode in being different from the system of cdma2000.BTS104 shifts indication and comes requesting terminal 106 to transfer to active state from idle condition through sending to terminal 106 on the forward link; Wherein shift the form of the message of indication on can common signal channel, after be right after some power control bits that sends as power control group.Terminal 106 can receive the sign of forward link dedicated from BTS104, receives traffic at this channel when activity is transferred to from the free time in terminal 106.BTS104 activates forward link dedicated through the transmission (including, but are not limited to the transmission of sky frame) of beginning power control bits and possible other waveforms subsequently.Terminal 106 subsequently the detection power control bit to confirm existing of dedicated channel.Before sent through reverse link at terminal 106, power control bits, order or the feedback of being sent by BTS104 were not any signal based on 106 receptions from the terminal, and they normally need terminal 106 to increase the order of power.Because the signal of reverse link is zero to noise and interference ratio basically, BTS104 just sends the order that increases power.Before 106 places, terminal catch forward link, simultaneously or afterwards, the terminal begins on the reverse link that BTS104 attempts to detect and catch, to transmit.Voice, data traffic, above both or some other prearranged signalss are sent in terminal 106 simultaneously.BTS104 awaits voice traffic or some other prearranged signalss, in a single day and receive traffic and signal, the power control mechanism of BTS104 just calculates correct power Control and Feedback order and begins to send useful feedback command to terminal 106.Useful feedback command refers to the feedback command based on the actual signal strength measurements of BTS104 on reverse link.Terminal 106 uses these useful feedback command to regulate the terminal transmission power level.
Another aspect of the present invention in cdma2000, when being in free time or control during hold mode, terminal transmitter 204 is movable at it in some (but not all) transmitter units, like channel, time slot, frequency or the like.The feedback channel of terminal transmitter 204 and BTS all is idle in some feedback units, like channel, time slot, frequency or the like.In aspect this,, activate the power control measurement and the feedback at BTS104 place for those feedback units.Because terminal transmitter 204 does not send; It just monitors the power Control and Feedback about unit that provides from BTS, and these yuan all are idle usually, and coherently make up feedback through command window; Suppose that these orders all are identical contents, as all being increase signal transmitting power or the like.
In addition, BTS104 uses the terminal is begun its power control and treatment from purpose idle or that control keeps transferring to activity.BTS is not through using channel, time slot or frequency transmission power control commands.When terminal 106 detect from BTS104 these not with channel, time slot or frequency on during the existing of power Control and Feedback; It is activated terminals transmitter 204 in the previous idle unit of all or part just; And begin predetermined waveform or conventional traffic; The transmission of the conventional traffic of perhaps predetermined waveform heel is as the response to attempting from the BTS104 initialization.In the time of in the BTS power control mechanism operation, terminal receiver catch from time of BTS104 transmission and BTS actual produce and carry out between the time that power control at terminal 106 have little delay.In case the terminal detects the transmission from BTS104, two-way communication has just begun.
Second aspect is that with the previous difference of describing second aspect do not comprise the transmission of a plurality of power control groups, then uses channel, time slot or the frequency of usefulness not so that " wake up " in terminal 106 and beginning power Control and Feedback between BTS104 and terminal 106.Though this second aspect can comprise the transmission or the indication to beginning to transmit on channel, time slot or the frequency of usefulness not through forward link of a plurality of power control groups, can use single power control group-indicate terminal 106:BTS104 to want to begin communication and transfer to active state from the control hold mode.The example of the channel of usefulness, time slot or frequency does not include but not limited to send indication through packet data control channel, perhaps makes the order of sending through forward fundamental channel or Forward Dedicated Control Channel useless.
Aspect described two, terminal 106 is more operational more quickly from the useful power Control and Feedback of BTS104 reception than previous.In aspect native system is aforesaid, its time that begins to send is accurately known at terminal 106, thereby between the power control command that is sent as initializing signal by BTS104, has marked difference.This significant difference provides the terminal to begin to monitor BTS power command and more Zao chance of sending signal than previous system is more Zao.The power control command that previous system needs terminal wait to be sent in response to the voice traffic transmission of coming self terminal 106 by BTS104, the terminal is in active state simultaneously.And have catching sooner and effective power command transfer design of aforementioned aspects of the present invention, the only use expense very little but time of non-zero to from the terminal 106 send to the signal of BTS104 detection, catch and transmission receives.Like this terminal 106 just can according to the order of all receptions or only according to detect/catch in certain that is suitable for the BTS104 known operation/transmission delay after those of reception order and regulate its transmitter power.The cdma system that is different from cdma2000 can the model identical running transferring to activity from the free time when.
In the design's the third aspect; The power control command that BTS104 sends preassigned pattern to the terminal is as initializing signal; Power control group like a series of different priorities; Design the power of this pattern, like the order of the order heel one " minimizing signal transmitting power " through sending " increase signal transmitting power " with suitable maintenance terminal transmitter 204.Adopt predetermined these power control commands of timed sending.In case given frame border or system, the pattern of being sent has just been decided.For example, in the transmission of Fig. 7 was provided with, the gating rate was 1/4, and followed a power control group by the blank frame of three 1.25ms.In aspect this of the design, BTS104 can send after power control group and add-subtract-the plus signal group, another power control group of heel, and redispatching subsequently subtracts-Jia-cut signal group.These orders are coherently made up to increase the detecting reliability of this initializing signal in terminal 106.Utilize the relevant operational command mode of BTS104 that pre-programmed is carried out at terminal 106; Comprise be used in response to from the signal of BTS104 at the terminal 106 command modes that begin to transmit, and return the required command mode that possibly postpone in terminal 106 for detecting, catch and send feedback command about the BTS control function of power.This delay can be used for the terminal to the use of feedback control signal restriction be not based on feedback control signal not based on the physical end power transfer during this period of time in.The beginning of actual power control survey and stopped constant power control command pattern from BTS104 from the subsequent feedback of BTS104.BTS sends actual useful power control command to terminal 106 subsequently.In addition, can in being different from the cdma system of cdma2000, use such scheme.
Fig. 8 is the block diagram of the design's first aspect.From Fig. 8, in point 801, BTS starting power controlled function.At point 802, BTS begins to send the set of redundant power control group, like PCG
1To PCG
4At point 803, terminal 106 received power control group PCG
1To PCG
4At point 804, the power control group that receives coherently make up on the forward link at terminal 106, and confirms in BTS gating rate to be that the existence of four power control groups under 1/4 the situation means that BTS hopes that the terminal transfers to activity from idle or control maintenance.Gating scheme in this example is 1/4, is in the terminal that receives four adjacent power control groups when free time or control keep and coherently makes up four groups to confirm existing from the transfer indication of BTS104.At point 805, the terminal begins power command and ignores at interval.At point 806, the terminal begins to send predetermined waveform, conventional traffic, the conventional traffic of perhaps predetermined waveform heel, on the reverse link of being measured by BTS104, to set up signal.At point 807, BTS catches the transmission at terminal, the energy that processing is received, and sends significant feedback.At point 808, BTS sends feedback to the terminal.At point 809, power command is ignored at interval then, and there is the effective order from BTS in indicating terminal.Terminal 106 just begins to send the degree that conventional traffic reaches does not also have completion like this, and regulates power control according to the power Control and Feedback that is received.
Fig. 9 is the flow chart of the design's second aspect.From Fig. 9, in point 901, BTS starting power controlled function.At point 902, BTS begins to send data through idle feedback unit.At point 903, terminal 106 receives the data of sending through idle feedback unit.At point 904, terminal 106 coherently is combined in the power control group that receives in the idle feedback unit, and confirms in these idle units, to exist data to mean that BTS hopes that the terminal keeps transferring to activity from idle or control.Usually suppose the existing of same signal (as all being the order that increases power) in the coherent combination of this point, and confirm the existence of signal according to the coherent combination of reception data.At point 905, the terminal begins power command and ignores at interval.At point 906, the terminal begins to send predetermined waveform, conventional traffic, the conventional traffic of perhaps predetermined waveform heel, on the reverse link of being measured by BTS104, to set up signal.At point 907, BTS catches the transmission at terminal, the energy that processing is received, and sends significant feedback.At point 908, BTS sends feedback to the terminal.At point 909, power command is ignored at interval then, and there is the effective order from BTS104 in indicating terminal.Terminal 106 just begins to send the degree that conventional traffic reaches does not also have completion like this, and regulates power control according to the power Control and Feedback that is received.
Figure 10 is the flow chart of the design's third aspect.From Figure 10, in point 1001, BTS starting power controlled function.At point 1002, BTS begins to utilize known timed sending burst or pattern, adds 1-like the power control group heel in the scheme of 1/4 gating rate and subtracts 1-and add 1 group.At point 1003, terminal 106 received power control group heels add-subtract-group of Jia.At point 1004; Terminal 106 coherent combination power control groups and signal and with follow-up signal and possibly power control group being compared with known mode; Confirming the possibility of the predetermined signal patterns that this group or pattern matching receive on the forward link, and confirm under BTS gating rate is 1/4 situation, to have power control group and add 1-to subtract 1-and add 1 pattern and mean that BTS hopes that the terminal keeps transferring to activity from idle or control.At point 1005, the terminal begins to ignore power command.At point 1006, the terminal begins to send predetermined waveform, conventional traffic, the conventional traffic of perhaps predetermined waveform heel, on the reverse link that can be measured by BTS104, to set up signal.At point 1007, BTS catches the transmission at terminal, the energy that processing is received, and sends significant feedback.At point 1008, BTS sends feedback to the terminal.At point 1009, power command is ignored at interval then, and indicating terminal exists from the BTS effective order.Terminal 106 just begins to send the degree that conventional traffic reaches does not also have completion like this, and regulates power control according to the power Control and Feedback that is received.
Can in some other elements of one or more and base station that remote terminal communicates, system 100 or their combination, realize aspect power control mechanism of the present invention and especially the system power regulating and controlling.Person of skill in the art will appreciate that and to use any different techniques and method representation information, state, sub-state, channel and signal.For example, can be by voltage, electric current, electromagnetic wave, magnetic field or magnetic particle, light field or light particle, perhaps their combination in any is represented data, instruction, order, information, signal, position and the chip quoted in the above description.
Various illustrative logical blocks, module, circuit and algorithm steps that the contact embodiment that those skilled in the art will also recognize that here to be disclosed describes can be embodied as electronic hardware, computer software or their combination.In order to be clearly shown that the interchangeability of hardware and software, more than usually to the various exemplary parts of functional descriptions, piece, module, circuit and step.Functional to be embodied as hardware still be that software depends on application-specific and the design limit that puts in the whole system with such.The technical staff can realize described function with the different modes of each application-specific, but such realization judgement should not be regarded as leaving scope of the present invention.Especially for the application; Be present in BTS though described some piece and function, can be expressly understood and be provided with, realize or to operate in addition these parts and/or its function at the diverse location in these hardware and softwares, other hardware and softwares or the system shown in Figure 1 with the mode of replacing.
Provide above description that those skilled in the art is implemented or utilize the present invention.Various modifications to these aspects are clearly for those skilled in the art, and the basic principle of definition here can be applicable to other embodiment, and do not break away from purport of the present invention and scope.Therefore, do not hope to limit the invention in described various aspects here, but the principle that will meet here to be disclosed and the wide region of features of novelty.
Claims (8)
1. method that the power control data is provided in wireless communication system comprises:
To second transceiver transfer indication is provided through transmitting channel from first transceiver, said transfer indication comprises the sign of dedicated channel, and second transceiver is desirably on this dedicated channel when activity and receives traffic; And
Send the activation dedicated channel through starting from first transceiver to the second transceiver power control data;
Through confirm the existence of dedicated channel at the second transceiver detection power control data and at second transceiver;
Second transceiver is transferred to active state; And
Traffic is sent to second transceiver from first transceiver through dedicated channel.
2. the method for claim 1 further is included in traffic after first transceiver sends to second transceiver, and second transceiver begins prearranged signals is sent to first transceiver through second channel.
3. method as claimed in claim 2 further is included in second transceiver and begins to send after the prearranged signals, the order of the first transceiver rated output Control and Feedback.
4. method as claimed in claim 3 further is included in after the rated output feedback command, and first transceiver sends to second transceiver with the order of power Control and Feedback.
5. equipment that the power control data is provided in wireless communication system comprises:
Be used for to second transceiver device that shifts indication being provided through transmitting channel from first transceiver, said transfer indication comprises the sign of dedicated channel, and second transceiver is desirably on this dedicated channel when activity and receives traffic; And
Be used for through starting the device that activates dedicated channel that sends from first transceiver to the second transceiver power control data;
Be used for through confirm the device of the existence of dedicated channel at the second transceiver detection power control data and at second transceiver;
Be used for second transceiver is transferred to the device of active state; And
Be used for traffic is sent to through dedicated channel from first transceiver device of second transceiver.
6. equipment as claimed in claim 5, further comprise be used for traffic after first transceiver sends to second transceiver, second transceiver begins prearranged signals is sent to through second channel the device of first transceiver.
7. equipment as claimed in claim 6 further comprises being used for after second transceiver begins to send prearranged signals, the device of first transceiver rated output Control and Feedback order.
8. equipment as claimed in claim 7 further comprises being used for after the rated output feedback command, and first transceiver sends to the order of power Control and Feedback in the device of second transceiver.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34759202P | 2002-01-09 | 2002-01-09 | |
| US60/347,592 | 2002-01-09 | ||
| US10/126,753 | 2002-04-19 | ||
| US10/126,753 US6963755B2 (en) | 2002-01-09 | 2002-04-19 | Method and apparatus for coherently combining power control commands to initialize communication |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB03804031XA Division CN100401647C (en) | 2002-01-09 | 2003-01-03 | Power control during state transition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101051857A CN101051857A (en) | 2007-10-10 |
| CN101051857B true CN101051857B (en) | 2012-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101026051A Expired - Lifetime CN101051857B (en) | 2002-01-09 | 2003-01-03 | Method and device for providing power control data in wireless communication system |
| CN200810125916.4A Expired - Lifetime CN101442347B (en) | 2002-01-09 | 2003-01-03 | Power control during state transition |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810125916.4A Expired - Lifetime CN101442347B (en) | 2002-01-09 | 2003-01-03 | Power control during state transition |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000074289A1 (en) * | 1999-05-29 | 2000-12-07 | Samsung Electronics Co., Ltd. | Transmitting and receiving device and method for continuous outer-loop power control while in dtx mode in a cdma mobile communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI94579C (en) * | 1994-01-12 | 1995-09-25 | Nokia Mobile Phones Ltd | Data Transfer method |
| KR100414932B1 (en) * | 1998-01-24 | 2004-04-03 | 삼성전자주식회사 | Method for communication data in cdma system |
| CN1249931C (en) * | 1998-07-28 | 2006-04-05 | 三星电子株式会社 | Gated transmission in control hold state in CDMA communication system |
-
2003
- 2003-01-03 CN CN2007101026051A patent/CN101051857B/en not_active Expired - Lifetime
- 2003-01-03 CN CN200810125916.4A patent/CN101442347B/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000074289A1 (en) * | 1999-05-29 | 2000-12-07 | Samsung Electronics Co., Ltd. | Transmitting and receiving device and method for continuous outer-loop power control while in dtx mode in a cdma mobile communication system |
| CN1310895A (en) * | 1999-05-29 | 2001-08-29 | 三星电子株式会社 | Transmitting and receiving device and method for continuous outer-loop power control while in DTX mode in a CDMA mobile communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101442347A (en) | 2009-05-27 |
| CN101442347B (en) | 2014-10-29 |
| CN101051857A (en) | 2007-10-10 |
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