CN100579314C - Systems and methods for performing outer loop power control in wireless communication systems - Google Patents
Systems and methods for performing outer loop power control in wireless communication systems Download PDFInfo
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- CN100579314C CN100579314C CN 200480007388 CN200480007388A CN100579314C CN 100579314 C CN100579314 C CN 100579314C CN 200480007388 CN200480007388 CN 200480007388 CN 200480007388 A CN200480007388 A CN 200480007388A CN 100579314 C CN100579314 C CN 100579314C
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Abstract
Systems and methods for controlling the power level for a mobile station during periods when no data is being transmitted by the mobile station. In one embodiment, data is intermittently transmitted from a mobile station to a base station on a reverse-link traffic channel. When data is being transmitted on the traffic channel, the transmitted data is used by the base station to perform power control operations (e.g., incrementing or decrementing the mobile station's power level, based upon comparison of a received SNR to a target SNR). When no data is being transmitted on the traffic channel, a ''zero-rate indicator'' is transmitted on the rate indicator channel. The zero-rate indicator is used by the base station to perform power control. Power control based on the zero-rate indicator may use velocity profiles, reliability metrics or other techniques to control adjustment of the power level.
Description
Require the priority under 35 sections 119 in U.S.
The application requires the 60/448th, No. 269 of submission on February 18th, 2003, and title is the provisional application of " Reverse link data communication "; Submitted on March 6th, 2003 the 60/452nd, No. 790, title is the U.S. Provisional Application of " method and apparatus that is used for the communication system reverse link communication "; And the 60/470th, No. 770 of submitting on May 14th, 2003, title is the non-provisional application of the U.S. Provisional Application No. of " being used for the outer-loop power control of REL.D ".
Technical field
The present invention relates generally to field of telecommunications, relate more specifically to, when on radio communication channel, transmitting data off and on, be used for providing the mechanism of outer-loop power control at this channel.
Background technology
Wireless communication technology is rapidly progressive, and wireless communication system is used to provide increasing share in the communication capacity that the active user can use.This is real, although compare with wired system, the enforcement of wireless communication system is faced with extra technology barrier.For example, wireless communication system must solve the problem about power control between base station and its travelling carriage, so that the performance of system reaches best, yet wired system does not have this problem.
A kind of wireless communication system comprises honeycomb fashion CDMA (code division multiple access) system that is configured to support voice and data communication.Can there be a plurality of base stations that communicate by wireless channel and a plurality of travelling carriage in this system.(these base stations also typically are connected to a plurality of other systems, for example public switched telephone network by cable network.) each base station with communicate corresponding to one group of travelling carriage in this sector of base station.The power of communicating by letter between this base station and these travelling carriages is responsible for controlling in this base station, so that drop to interference minimum and make throughput reach maximum, prolongs their service time thereby also make travelling carriage can save energy.
Power control between base station in such system and the travelling carriage typically based on base station and travelling carriage between the relevant error rate of communicating by letter.The target of power control is the power that controls transmitter, so that the data that transmit are decoded with fixing quality standard.A kind of tolerance of quality is frame error rate, i.e. the ratio that is received by mistake in the Frame of Chuan Songing.Ideally, the travelling carriage delivering power is adjusted to the level that can produce required predetermined frame error rate.For this reason, power control typically has two loops: inner ring road and outer ring.Inner ring road is measured the signal to noise ratio (snr) of base station termly and itself and target SNR is made comparisons.This measurement can be performed in the combination of any channel that can be used as power reference or channel.What for example, this measurement was finished on reverse link pilot channel (R-PICH) typically in cdma2000.The result of this comparison is used to generate power control command, and power control command is passed to travelling carriage.For example, if be lower than target SNR at the SNR of base station measurement, inner ring road indicates travelling carriage to increase its delivering power issue an order, if be higher than target SNR at the SNR of base station measurement, inner ring road indicates travelling carriage to reduce its delivering power issue an order.Outer ring upgrades target SNR termly based on the valuation of current decoding quality.For example, outer ring can increase 1dB with target SNR when having frame to be misread yard, and when having frame to be correctly decoded target SNR is reduced 0.01dB.In this way, the target SNR of inner ring road is adjusted to the level that can keep the predetermined error rate accepted.
Though this power control algorithm is suitable for transmitting continuously the channel of data, be not applicable to the channel that is used by intermittence very much.The problem of this situation is, very briefly, is exactly in some time period, and not having can be as the Frame of the benchmark of adjusting target SNR.R-PICH for example, although inner ring road may be handled the signal of continuous transmission, outer ring can be used to upgrade target SNR without any signal.In other words, when frame transmitted, the mistake in these frames can be identified, and target SNR just can be adjusted to reach desired error rate, but when not having frame transmitting, just can not determine that target SNR should be adjusted upward still adjustment downwards.Therefore, after the period that does not have Frame to be transmitted, target SNR may not be arranged on desirable level, so inner ring road can not instruct this travelling carriage to upload feed signals in optimum level.If this level is set to too low, then initial those frames that transmit almost have mistake certainly.On the other hand,, then waste energy and can produce unnecessary interference, also may cause the transmission of other travelling carriage to go wrong if this power level is too high.Therefore the mechanism that can be issued to preferred target SNR level by it in the situation that does not have data to transmit need be provided.
Summary of the invention
One or more problems of summarizing above can solve with various embodiment of the present invention.Put it briefly, the period that present invention resides in the transmission of travelling carriage free of data is used to control the system and method for this travelling carriage power level.
In one embodiment, wireless communication system comprises base station and one or more by corresponding wireless communication link mobile stations communicating.Each link all has a plurality of channels, has both comprised the forward link channel that is used for transmitting to travelling carriage from the base station data, also comprises the reverse chain channel that is used for transmitting to the base station from travelling carriage data.Article one, reverse link traffic channel is only intermittently used (that is, in some periods, transmit data on this channel, and in other period, do not have data to transmit).When data just were transmitted on Traffic Channel, the data of transmission were used to carry out power control operation (for example, based on the mistake in the data that receive, improving or reduce the target SNR level of base station) by the base station.When the data that on Traffic Channel, just be not transmitted, on rate indicator channel, transmit " zero-rate indicator (zero-rate indicator) ".In this case, this zero-rate indicator is used to carry out outer-loop power control and upgrades target SNR by the base station.It should be noted that when the data that transmitting were arranged on the Traffic Channel, what transmit was corresponding rate indicator on rate indicator channel, but these rate indicators are not used in power control.
An alternative embodiment of the present invention comprises a kind of method of the power control that is used for providing wireless communication system, and the base station of this system and travelling carriage are reversed the link rate indicating channel and reverse link traffic channel links together.The method of this embodiment comprises: when transmitting professional arranged on the reverse link traffic channel, transfer rate indicator signal on the reverse link rate indicating channel then, the speed of the business that just is being transmitted on the corresponding reverse link traffic channel of this rate indicator signal, and control the target SNR of the outer ring of this travelling carriage based on the business that just is being transmitted on this reverse link traffic channel; And when do not transmitting on the reverse traffic channel professional the time, periodically on the reverse rate indicating channel, transmit zero-rate indicator and come controlled target SNR based on this zero-rate indicator.
Many other embodiment also can realize.
Description of drawings
This paper specifies and the introduction of accompanying drawing is disclosed many aspects of the present invention and feature by following, wherein:
Fig. 1 is the structure chart according to the wireless communication system of the demonstration of an embodiment;
Fig. 2 is the theory diagram according to the basic structural components of the wireless transceiver system of an embodiment;
Fig. 3 is according to the travelling carriage of an embodiment and the schematic diagram of a plurality of channels between the base station;
Fig. 4 is the theory diagram according to the structure that is used for the reverse-link enhanced supplemental channel that encoder packet size is 768 or 1536 bits (R-ESCH) of an embodiment;
Fig. 5 is the theory diagram according to the universal architecture of the reverse link rate indicating channel (R-RICH) of an embodiment;
Fig. 6 is the operational flowchart according to the travelling carriage of an embodiment; And
Fig. 7 is the operational flowchart according to the base station of an embodiment.
Though show clear and definite embodiment by way of example in the drawings with in appended the specifying, the present invention can have multiple modification and interchangeable form.Should be appreciated that, in any case these figure do not really want the present invention is defined as described those certain embodiments with specifying.
Embodiment
Below one or more embodiment of the present invention are described.Should be noted that these embodiment and any other the embodiments described below all demonstrate, is to carry out illustration rather than restriction to the present invention.
Just as described in this article, various embodiments of the present invention comprise the system and method that is used for controlling in the period that travelling carriage does not transmit data the power level of this travelling carriage.As mentioned above, the power in wireless communication system control typically based on signal to noise ratio (snr) with the relevant error rate of institute's received frame.Usually, be by when the SNR that receives drops under the target SNR, commanding this travelling carriage to improve its power level, and when the SNR that receives is higher than target SNR, reduce its power level, control the power level of travelling carriage.When there is mistake the base station inside the frame that this travelling carriage receives, improve target SNR similarly, when the frame that receives from travelling carriage is free from mistakes, reduce SNR.
In an embodiment of wireless communication system, communication realizes by many radio communication channels between base station and travelling carriage.In these channels some transmit continuous data business (for example, Frame), and other channel just intermittently uses.One of intermittent channel that uses comprises reverse-link enhanced supplemental channel (R-ESCH).This R-ESCH uses together in conjunction with reverse link rate indicating channel (R-RICH).When Frame transmits on R-ESCH, the corresponding designator of speed that data transmit on transmission and R-ESCH on the R-RICH.By convention, when on R-ESCH, not having data to be transmitted, there is not speed indication information to transmit on the R-RICH yet.In one embodiment of the invention, when on R-ESCH, not having data to be transmitted, during certain part in the period that speed indication information is normally transmitted, on R-RICH, transmit " zero-speed rate (zero-rate) " designator.For example, should " zero-speed rate " designator can be in 20 milliseconds of frame periods first and the 5th millisecond of transmission.Should be used for the power level that definite travelling carriage should use by the base station by " zero-speed rate " designator.Therefore, when the attenuation characteristic of travelling carriage changed, even travelling carriage is not transmitting data, the base station also can keep knowing this attenuation characteristic by " zero-speed rate " designator, therefore can determine inappropriate power level for this travelling carriage.
In one embodiment, R-ESCH can be used for transmitting data from travelling carriage to the base station with scheduling method or autonomous mode.In this embodiment, above-described the sort of power control algorithm is all used in the transmission of carrying out with arbitrary pattern wherein.In other words, when not having data just being transmitted, periodically " zero-speed rate " designator is sent to the base station so that this base station can be determined the decoding quality of received signal and upgrade the current target SNR that is suitable for outer-loop power control.Thereby when data transmitted beginning, the target SNR of outer ring obtained suitable setting.In arbitrary pattern, in case transmitting, data begin, just can handle control (that is, by whether having mistake to improve or reduce target SNR) by convention based on the frame that is received to power controlled target SNR level.
In an alternative embodiment, above-mentioned Poewr control method can use under autonomous mode, and diverse ways is used in the transmission under scheduling method.For example, under scheduling method, can use predetermined target SNR to carry out data and transmit, this predetermined target SNR is enough high, guarantees that with rational certainty the frame that transmits the incipient stage will be received by zero defect ground.In this embodiment, can according to usage handle, transmit by data and improve or reduce this level at the very start based on frame error rate the control of power controlled target SNR level.
A preferred embodiment of the present invention is implemented in the wireless communication system, and this wireless communication system meets a kind of version of cdma2000 standard usually.Cdma2000 is based on the third generation (3G) wireless communication standard of IS-95 standard.The cdma2000 standard develops and continues development gradually to continue to support new service.The preferred embodiments of the present invention are estimated to can be used for to use in the system of D version of cdma2000 standard, (for example, implement in system W-CDMA) but other embodiment may can or meet other standard in other version of cdma2000.Therefore embodiment described here should be understood that to demonstrate, rather than limit.
With reference to figure 1, the figure shows the structure chart of the wireless communication system of a demonstration.Shown in this width of cloth figure, system 100 comprises and is configured to the base station 110 of communicating by letter with a plurality of travelling carriages 120.Travelling carriage 120 can be, for example, and cell phone, personal information manager (PIM or PDA) or be configured to be used for this kind equipment of radio communication.Should be noted that these equipment do not need reality " to move ", as long as but can communicate by Radio Link with base station 110.Base station 110 sends data by corresponding forward link (FL) channel to travelling carriage 120, and travelling carriage 120 sends data by corresponding reverse link (RL) channel to base station 110 simultaneously.
Should be noted that concerning the disclosure identical project is used identical Reference numeral back and added lowercase and represent among each figure, for example, 120a, 120b or the like.These projects can be quoted jointly by Reference numeral in this article.
But in actual applications, the specific design of base station 110 and travelling carriage 120 has a great difference, and each all is used for communicating by letter on forward direction and the reverse link as wireless transceiver.Therefore, base station 110 has identical universal architecture with travelling carriage 120.This structure as shown in Figure 2.
With reference to figure 2, the figure shows theory diagram according to the basic structural components of the wireless transceiver system of an embodiment.As shown in the drawing, this system comprises emission subsystem 222 and receiving subsystem 224, and they all are connected with antenna 226.Emission subsystem 222 and receiving subsystem 224 can be called transceiver subsystem together.Emission subsystem 222 and receiving subsystem 224 insert forward direction and reverse link by antenna 226.Emission subsystem 222 and receiving subsystem 224 are also connected to processor 228, and processor 228 is configured to control and transmits and receives subsystem 222 and 224.Memory 230 is connected to processor 228 and provides working space and local storage for this processor.Data source 232 is connected to processor 228 and provides data for this system transmits.Data source 232 can comprise, for example, and loudspeaker or from the input of the network equipment.Data are sent to emission subsystem 222 after handling through processor 228, and it is by antenna 226 these data of emission.The data that receiving subsystem 224 receives by antenna 226 are sent to processor 228 and handle, and present to the user to data output 234 then.Data output 234 can comprise for example following equipment, loud speaker, visual display unit or to the output of the network equipment.
The professional and technical personnel in the field at place of the present invention is with clear, and structure shown in Figure 2 is illustrative, and other embodiment can use alternative configuration.For example, processor 350, it can be general microprocessor, digital signal processor (DSP) or application specific processor, can carry out some or all function or required any other processing of transceiver of other assembly of transceiver.Therefore the scope of this paper claims is not restricted to specific configuration mentioned in this article.
Consider the structure that in travelling carriage, realizes Fig. 2, the assembly of this system can be counted as being connected to the transceiver subsystem of processing subsystem, wherein transceiver subsystem is responsible for receiving on wireless channel and the emission data, processing subsystem is responsible for the data that transceiver subsystem is prepared and is provided for transmitting, and receives and handle the data that it obtains from this transceiver subsystem.Can think that transceiver subsystem comprises emission subsystem 222, receiving subsystem 224 and antenna 226.Can think that processing subsystem comprises processor 228, memory 230, data source 232 and data output 234.
As above narrate, in fact the communication link between base station and the travelling carriage comprises a plurality of channels.With reference to figure 3, the figure shows a plurality of channels between travelling carriage and the base station.As shown in the drawing, base station 110 sends data by one group of forward link channel 310 to travelling carriage 120.These channels typically comprise the Traffic Channel that transmits data and pass through the control channel that it transmits control signal.Each Traffic Channel all has one or more associated control channels usually.Forward link channel 310 can comprise, for example can be used to transmit low speed data forward fundamental channel (F-FCH), can be used to forward supplemental channel (F-SCH) at a high speed, point-to-point communication or can be used for forward high-speed broadcast channel (F-HSBCH) to a plurality of message recipient broadcasts.This channel can also comprise and be used to transmit about Traffic Channel or about Forward Paging Channel (F-PCH), forward broadcast control channel (F-BCCH) or the Forward Dedicated Control Channel (F-DCCH) of the control information of the others of this system operation.
Travelling carriage 120 is launched data by one group of reverse link 320 to base station 110.In addition, these channels typically not only comprise Traffic Channel but also comprise control channel.Travelling carriage 120 can go back to data transmission to the base station on these following channels, as Reverse Access Channel (R-ACH), prolongation Reverse Access Channel (R-EACH), reverse request channel (R-REQCH), reverse (R-ESCH), Reverse Dedicated Control Channel (R-DCCH), Reverse Common Control Channel (R-CCCH) or reverse rate indicating channel (R-RICH).In these channels two, R-ESCH and R-RICH (by Reference numeral among Fig. 3 321 and 322 expressions) are noticeable especially, because implemented power control mechanism of the present invention in one embodiment in these two channels.
In one embodiment, R-ESCH is used to transmit high-speed data from travelling carriage to the base station.Data can be on R-ESCH is that speed from 9.6kbps to 1228.8kbps transmits with scope.Data are transmitted in the subframe of 5ms.The universal architecture of R-ESCH as shown in Figure 4.
With reference to figure 4, the figure shows and be used for the structural principle block diagram of R-ESCH that size is the encoder information bag of 768 or 1536 bits.Should be noted that in this embodiment this structure will change to some extent when combining use with other big or small packets of information (192,384,2304,3072,4608 or 6144 bit).When realizing in other embodiments, this structure also can change to some extent.The structure of Fig. 4 only is the example of possible structure.
As shown in Figure 4, the packets of information CRC of 16 bits at first is added in the information bit to be launched in module 410.In module 420, add the turbo encoder tail trim amount (tailallowance) of 6 bits, so that the size of current information bag is 768 or 1536 bits (corresponding respectively to the packet size that receives is 746 or 1514 bits).On packets of information, carry out Turbo coding (module 430) and block interleaving (module 440) then.The symbol modulated (module 450) that produces is also covered (module 460) by walsh code.Because these operations are that this area professional and technical personnel is known, will no longer be described in detail here.
R-RICH is moved platform and is used for transmitting the rate indicator that expression R-ESCH goes up employed transformat.Each sub-packets of information that transmits on R-ESCH is sent a rate indicator.In one embodiment, rate indicator comprises five bits.Three expression R-ESCH in these five bits go up the size of corresponding sub-packets of information.Corresponding relation between these three bits and the packet size is as shown in table 1 below.
Table 1
| The packet size bit of rate indicator | Encoder information bag size |
| 000 | 192 |
| 001 | 384 |
| 010 | 763 |
| 011 | 1536 |
| 100 | 2304 |
| 101 | 3072 |
| 110 | 4608 |
| 111 | 6144 |
The sub-packet identifier of the corresponding sub-packets of information on other two the expression R-ESCH of the five bits the inside of rate indicator.For example, in this embodiment, each packets of information be divided into four each be 5 milliseconds sub-packets of information, therefore sub-packet identifier represents that in these four sub-packets of information (1,2,3 or 4) which is corresponding with rate identifier.Corresponding relation between these bits and the sub-packet identifier is as shown in table 2 below.
Table 2
| The sub-packets of information bit of rate indicator | The sequence number of sub-packets of information (SPID) |
| 00 | 1 |
| 01 | 2 |
| 10 | 3 |
| 11 | 4 |
With reference to figure 5, the figure shows the block diagram of universal architecture of the R-RICH of a preferred embodiment.Should notice that this structure is an example, may change in other embodiments to some extent.As shown in Figure 5, five bits of this in the rate indicator are at first handled by the orthogonal encoder of module 510.In module 520 symbol that is encoded being carried out sequence afterwards repeats.Next sequence selection device 530 selects the symbol or the zero-rate indicator that are encoded, and this will explain hereinafter in more detail.Then, in module 550, each bit of selected designator (actual speed rate designator or zero-rate indicator) is carried out the signaling point mapping.Consequent then signal is covered (module 560) by suitable walsh code.Because these operations are that this area professional and technical personnel is known, will not do more detailed elaboration here.
As indicated above, when data just transmitted on R-ESCH, power control was performed in a conventional manner.In other words, when the base station received data from travelling carriage, the base station determined that the SNR of received signal is higher than target SNR or is lower than target SNR.If the SNR that receives is higher than target SNR, base station commander's travelling carriage reduces its power level.If the SNR that receives is lower than target SNR, base station commander's travelling carriage improves its power level.Adjust target SNR according to whether containing mistake in the frame that receives.If contain mistake in the frame, then target SNR is too low, therefore with its raising.If do not contain mistake in the frame, think that then target SNR is at least a bit too high, therefore with its reduction.Typically, the step-length of the target SNR institute foundation of the power level of raising travelling carriage and base station is all much bigger than the step-length that reduces their institute's foundations.For example, the size of raising step-length can be 100: 1 with the ratio of the size that reduces step-length.Therefore, if for example have mistake in the data of Jie Shouing, power level is improved rapidly, if but being free from mistakes existence, power level is reduced very lentamente.
The problem that is run into when making in this way can be used this fact to cause by R-ESCH off and on.In other words, in a period of time, have data and transmit on this channel, having a little while afterwards, this channel is not used.When on R-ESCH, not having data to transmit, can't detect the transmission mistake, therefore can't improve and/or reduce target SNR based on this mistake.Inner ring road can continue to upgrade delivering power based on the channel that continues to exist, but can not adjust target SNR.So if during the period that free of data transmits, the channel quality of R-ESCH has changed, it may be inappropriate then reportedly sending the last at first target SNR of using when next number.If this target SNR is too high, travelling carriage will be in rain consumed power, also will and the transmission of other travelling carriage between produce unnecessary interference.If target SNR is too low, the then initial frame that transmits will contain too many mistake and without any use.Therefore, in a preferred embodiment, when not having data transmitting on the R-ESCH, on the R-RICH channel, periodically transmit zero-rate indicator, only provide benchmark for outer-loop power control.Should be noted that " zero-rate indicator " this speech with in this article referring to any designator that when not having data transmitting on the Traffic Channel, is transmitted, be not limited to clearly represent that traffic channel data rate is zero designator.
In embodiment as shown in Figure 5, zero-rate indicator " 1 " is provided for bit repetition block 540, and resultant bitstream is provided for sequence selection device 530.If there are not data to transmit on the R-ESCH, then require zero-speed rate signal input to sequence selection device 530, produce selecteed zero-rate indicator.When having data to transmit on the R-ESCH, use with the same method of processing speed designator and handle this designator.
Though can not transmit zero-rate indicator during having data to transmit on the R-ESCH always, preferred embodiment does not only have the part-time in time that data transmit to transmit zero-rate indicator on R-ESCH.For example, the frame of 20ms can be divided into the subframe of four 5ms.In a preferred embodiment, only the image duration in these four subframes, for example during first subframe, transmit zero-rate indicator.
When the base station received zero-rate indicator, with its decoding, the base station determined that with this decoded results the target SNR of corresponding travelling carriage should heighten or turn down.In one embodiment, target SNR increases 1dB if decoding is failed, if decode successfully then target SNR reduction 0.1dB.The base station is to reducing the zero-rate indicator decoding error rate that is based on expectation with the selection of the ratio that increases.
In one embodiment, travelling carriage makes rate indicator channel transmit with identical service pilot ratio always, is zero-rate indicator or non-zero rate indicator regardless of what sending.The base station is estimated the decoded error rate on the rate indicator channel when data transmit.Then it uses this target error rate setting to be used for upgrading the added value and the minimizing value of target SNR based on zero-rate indicator.For example, the quantity k of the rate indicator of being misread sign indicating number during nearest 100 sub-packets of information can be added up in the base station.When travelling carriage does not transmit any data and when transmitting zero-rate indicator on reverse link, if the decoding error of zero-rate indicator then target SNR is increased 1dB, if the decoding of zero-rate indicator would successfully reduce 1/ (100/k-1) dB with target SNR.This error rate that has guaranteed zero-rate indicator will remain on about k/100.
Can handle the zero-rate indicator that receives with multiple diverse ways.For example, can determine the velocity contour of travelling carriage with zero-rate indicator.This can finish by multiple technologies known in the operation technique field, for example the crossing on the same level technology.In case determined velocity contour, just can adjust target SNR with it.Because travelling carriage towards the base station or the speed that deviates from the base station cause from the signal that travelling carriage transmits, producing Doppler frequency shift, so this speed has reduced the performance of receiver and decoder.If the velocity contour of travelling carriage is known, can controlled target SNR to compensate caused reduction.
Can also handle zero-rate indicator with multiple other method, for example by obtaining the energy density of zero-rate indicator signal, and with itself and pilot signal relatively.Also can determine the reliability of zero-rate indicator signal with degree of reiability.If it is reliably that this signal is determined, think that then SNR is enough high, therefore reduce the target SNR of corresponding travelling carriage.If it is insecure that this signal is confirmed as, the power level of the rate indicator that then receives is too low, therefore improves target SNR.These and other technology can be used among the plurality of replaceable embodiment of the present invention.
With reference to figure 6, the figure shows travelling carriage operational flowchart according to an embodiment of the invention.In this figure, travelling carriage at first determines whether the data (module 610) that remain to be transmitted.If the data that remain to be transmitted can transmit these data by scheduling or autonomous sending, as other place in the disclosure is described.When on reverse link traffic channel, transmitting these data, on the reverse link rate indicating channel, transmit rate indicator (module 620) corresponding to each subframe of the data on the reverse link traffic channel.But, if data not transmitted then periodically transmit zero-rate indicator (module 630) on the reverse link rate indicating channel.In one embodiment, the preceding 5ms in each 20ms frame transmits zero-rate indicator.
With reference to figure 7, the figure shows base station operation flow chart according to an embodiment of the invention.As shown in Figure 7, according to the rate indicator that receives, the base station checks whether reverse link rate indicating channel (module 710) and specified data transmit (module 720).If receive non-zero rate indicator, the base station is known transmitted corresponding subframe on reverse link traffic channel.The base station subframe that translation receives according to the rate indicator that receives is also adjusted target SNR (module 730) based on the error situation in the data that receive.If receive zero-rate indicator on the reverse link rate indicating channel, the base station is known in reverse link traffic channel not transmitting data, so the base station is adjusted (module 740) according to zero-rate indicator to target SNR.
By zero-rate indicator is provided on R-RICH, system need just can not carry out the power control operation by communicating control information on R-FCH or R-DCCH.This can significantly reduce overhead.Should also be noted that by used as additional pilot tone, R-RICH can be used for providing additional channel estimating for the R-ESCH demodulation.Can be with carrying out this function than transmitting the used lower power level of power level of rate indicator that transmits corresponding to the R-ESCH data.
In a preferred embodiment, the data on the R-ESCH transmit and can carry out under the arbitrary pattern in following two patterns: scheduling transfer mode or autonomous transfer mode.Name as these patterns is represented, travelling carriage can interact with the base station and obtain the regulation moment of transmitting data on R-ESCH, perhaps under certain conditions, the travelling carriage transmission that do not need at first to obtain regulation just can independently be enabled in the data transmission on the R-ESCH constantly.
In one embodiment, reverse link is designed to, as long as there is reverse link data to be transmitted, just the heat (rise-over-thermal) that rises with the base station remains on relatively-stationary level, still allows each travelling carriage to transmit with the peak data rate that each travelling carriage can reach simultaneously.This design attempts to provide needed time division multiplexing gain on the reverse link, and in order to make the delay minimum that transmits data, the travelling carriage that still allows to have low volume data independently transmits their data.As mentioned above, reverse link is designed to provide these features by allowing travelling carriage to transmit data with following two kinds of diverse ways on R-ESCH: by autonomous transmission; And by the scheduling transmission.
The autonomous transmission is used to transmit the business that can not allow too many delay.Autonomous transmit to be used to reduce postpone and to the controlled expense of delay-sensitive data, and particularly useful to transmission from the travelling carriage of the very high cell edge of expense cost.Any moment travelling carriage has data to transmit, and travelling carriage can both be independently to transmit these data up to the specific transfer rate that the base station was determined.Maximum data transmission rate is to be provided with according to the ratio (T/P) that the maximum traffic signal of base stations during appointment and pilot signal are set up in conversation.This T/P can be revised by the follow-up signaling between base station and the travelling carriage.Maximum T/P is different concerning different travelling carriages, and among other thing, requires relevant with the service quality (QoS) of different mobile stations.
The autonomous transmission is useful especially when needs transmit low volume data.Independently transmitting with little time-delay is feature, and time-delay is the time (that is data necessary time quantum of waiting for before it is transmitted) of experience before data transmit.The autonomous transmission used and the identical automatic repeat requests of mixing (H-ARQ) mechanism of scheduling transmission.But in some cases, travelling carriage may not transmit with the speed that is higher than minimum speed limit, and it is too high similarly may to send the affirmation cost to travelling carriage concerning the base station, therefore can not use scheduling to transmit.In these cases, autonomous transmission may be set up by layer 3 signaling, thereby has eliminated the needs of travelling carriage for this purpose monitoring forward link control channel.In alternative embodiment, this information may be transmitted with other means, for example the hand-off direction message (HDM) on the Traffic Channel.
Scheduling transmits and is used for when the T/P that can be moved the platform support is more higher leveled than the maximum T/P of autonomous transmission at least, and autonomous at least one the bigger complete packets of information of the packets of information that maximum T/P supported of the enough packing ratios of data in the travelling carriage buffer.Determining whether to satisfy in the process of these conditions, travelling carriage will occur in the timing period between request that scheduling is transmitted and the permission of the dispatching transmission with independently transmission, autonomous transmission.
If the request that scheduling is transmitted goes through, (for example, the 5ms message on R-REQCH) sends this request to travelling carriage by the request channel.Alternately, this request can be passed through control channel (for example, R-DDCH) transmission.This request comprise the T/P that expression R-ESCH supports four bits, expression travelling carriage queue size four bits and represent four bits of the QoS grade that this transmission is required.In response to this request of reception, grant message can be launched to travelling carriage in the base station.This message can pass on independent permission also can pass on public permission.Therefore, can pass through forward grant channel (for example, T-GCH) or the public grant channel of forward direction (for example, F-CGCH) transmit this permission.Permit specially be this travelling carriage approval one scheduling delivery time section separately, and any travelling carriage that public permission allows to wish transmission is done so.
After request was transmitted in the base station, travelling carriage need wait for that predetermined amount of time (minimum heavy request delay, or T_MRRD) could send another scheduling and transmit request.T_MRRD is sent to this travelling carriage by layer 3 signaling.In order to allow from the request message of losing, to recover, prevent too early request simultaneously, this travelling carriage need wait for that this time quantum could weigh request scheduling and send permission.
The base station can be for arranging the time from the transmission of any request travelling carriage.The arrangement of time decision of base station can be based on the factors such as soft handover (SHO) state of for example travelling carriage.The arrangement of time decision can receive the base station by this and make alone, also can be made simultaneously by all base stations in the efficient set.To causing longer dispatch delay comprising of all efficient set members, permit required energy but also may save because of diversity.
About each specific embodiment various aspects of the present invention and character have been described." comprise " as used herein, " comprising " these speech or their any other conjugations, all be not exclusively to comprise the key element that those speech are closelyed follow later or the meaning of restriction.Therefore, the system, method or other embodiment that comprise a cover key element are not restricted to those key elements, also may comprise specially not being listed among the embodiment that is proposed or belonging to other intrinsic among the embodiment that is proposed key element.
Describe the time of the present invention at the reference specific embodiment, should be appreciated that these embodiment are illustrative, and scope of the present invention is not restricted to these embodiment.Various deformation, modification, interpolation and improvement that above-described each embodiment is carried out all are possible.We think that these distortion, modification, interpolation and improvement are included within the specifically described scope of the present invention of following claim.
Claims (14)
1. method of in system, carrying out with reverse link traffic channel and reverse link rate indicating channel, described system comprises travelling carriage and base station, wherein said method comprises:
When on the described reverse link traffic channel during just at transport service,
Described travelling carriage is the transfer rate indicator signal on described reverse link rate indicating channel, and wherein said rate indicator signal is corresponding to the speed of the described business that is transmitting on the described reverse link traffic channel, and
The power controlling level is come based on the described business that is just transmitting on the described reverse link traffic channel in described base station; And
When not having on the described reverse link traffic channel at transport service,
Described travelling carriage periodically transmits zero-rate indicator on described reverse link rate indicating channel, and
Described power level is controlled based on described zero-rate indicator in described base station.
2. the method for claim 1, wherein said reverse link traffic channel comprises cdma2000 reverse-link enhanced supplemental channel (R-ESCH).
3. the method for claim 1, wherein said reverse link rate indicating channel comprises cmda2000 reverse link rate indicating channel (R-RICH).
4. the method for claim 1, wherein said zero-rate indicator was transmitted in the part period in each frame period, and the wherein said part period comprises the period that is less than the entire frame cycle.
5. method as claimed in claim 4, wherein each frame comprises a plurality of subframes, wherein said zero-rate indicator is transmitted in described subframe one or more.
6. method as claimed in claim 5, wherein said zero-rate indicator is transmitted in a subframe of each frame.
7. method as claimed in claim 6, wherein each frame comprises the cycle of 20ms, described frame is divided into four subframes that each all is 5ms.
8. method of in the base station that can communicate, carrying out by wireless communication link and travelling carriage, wherein said method comprises:
When receiving business on the reverse link traffic channel,
Come the power controlling level based on the described business that just is being transmitted on the described reverse link traffic channel; And
When on described reverse link traffic channel, not receiving business,
Receive the zero-rate indicator that periodically transmits on the reverse link rate indicating channel, and
Control described power level based on described zero-rate indicator.
9. method as claimed in claim 8, wherein said reverse link traffic channel comprise cdma2000 reverse-link enhanced supplemental channel (R-ESCH).
10. method as claimed in claim 8, wherein said reverse link rate indicating channel comprises cmda2000 reverse link rate indicating channel (R-RICH).
11. method as claimed in claim 8, wherein controlling described power level based on the described business that just is being transmitted on the described reverse link traffic channel comprises, when the signal to noise ratio (snr) of the described data that receive is lower than target SNR, commander improves the power level relevant with described travelling carriage from the travelling carriage that it receives described data, and when the SNR of the described data that receive is higher than target SNR, reduce the described power level relevant with described travelling carriage.
12. method as claimed in claim 8, wherein control described power level and comprise the degree of reiability of calculating described zero-rate indicator based on described zero-rate indicator, when described degree of reiability shows that described zero-rate indicator is unreliable, raising receives the power level of the travelling carriage of described zero-rate indicator from it, show when described zero-rate indicator is reliable and work as described degree of reiability, reduce described power level.
13. method as claimed in claim 8, wherein controlling described power level based on described zero-rate indicator comprises, based on the power of described zero-rate indicator calculate from its receive described zero-rate indicator travelling carriage velocity contour and adjust the power level of described travelling carriage based on described rate calculated distribution map.
14. method as claimed in claim 8, wherein control described power level and comprise, calculate the power density of described zero-rate indicator and receive the power level of the travelling carriage of described zero-rate indicator from it based on the power density adjustment of described calculating based on described zero-rate indicator.
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| US44826903P | 2003-02-18 | 2003-02-18 | |
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| US10/652,355 | 2003-08-29 |
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| CN200480009878.6A Expired - Lifetime CN1774885B (en) | 2003-02-18 | 2004-02-18 | Method, apparatus and system for scheduled and autonomous transmission and acknowledgement |
| CNB2004800073878A Expired - Lifetime CN100441009C (en) | 2003-02-18 | 2004-02-18 | Outer-loop power control for wireless communication systems |
| CN 200480007388 Expired - Fee Related CN100579314C (en) | 2003-02-18 | 2004-02-18 | Systems and methods for performing outer loop power control in wireless communication systems |
| CNB2004800044752A Expired - Fee Related CN100456878C (en) | 2003-02-18 | 2004-02-18 | Faster frame error detection in a CDMA network |
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| CN200480009878.6A Expired - Lifetime CN1774885B (en) | 2003-02-18 | 2004-02-18 | Method, apparatus and system for scheduled and autonomous transmission and acknowledgement |
| CNB2004800073878A Expired - Lifetime CN100441009C (en) | 2003-02-18 | 2004-02-18 | Outer-loop power control for wireless communication systems |
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| US8995559B2 (en) * | 2008-03-28 | 2015-03-31 | Qualcomm Incorporated | Signaling message transmission in a wireless communication network |
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| UA86761C2 (en) | 2009-05-25 |
| UA89162C2 (en) | 2010-01-11 |
| CN1762169A (en) | 2006-04-19 |
| CN1762174A (en) | 2006-04-19 |
| CN1751531A (en) | 2006-03-22 |
| CN1762119A (en) | 2006-04-19 |
| CN100441009C (en) | 2008-12-03 |
| UA84865C2 (en) | 2008-12-10 |
| UA89024C2 (en) | 2009-12-25 |
| CN1774885B (en) | 2015-07-22 |
| UA92131C2 (en) | 2010-10-11 |
| CN100456878C (en) | 2009-01-28 |
| CN1774885A (en) | 2006-05-17 |
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