CN101138187A - Method and apparatus for controlling transmission data rate based on feedback related to channel conditions - Google Patents
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Abstract
A network entity comprising a processor configured to regulate a data rate of transmissions on a wireless channel from a base station to a subscriber station based on feedback from the subscriber station, the feedback relating to wireless channel conditions, the processor further configured to determine an alternative data rate for one or more transmissions on the wireless channel.
Description
Priority request under 35 U.S.C. § 119
Present patent application requires on February 1st, 2005 to submit to and be transferred to the assignee of the present invention and is therefore clearly quoted the provisional application No.60/649 that is entitled as " Method and Apparatus for Channel State Feedback SignalErasure Mapping at Base Station (the channel state feedback signal at place, base station is wiped the method and apparatus of mapping) " that is contained in this, 360 priority.
Background
The field
The disclosure relates generally to communication, relates in particular to based on the transmission data rate in the FEEDBACK CONTROL cordless communication network that relates to channel conditions.
Background
In cordless communication network, Receiver And Transmitter is shared control information each other.This control information usually is used to scheduled transmission and/or definite transmission parameter.An example is the data rate request that sends to network from subscriber station, and wherein this type of request is used for controlling the data transfer rate that transmits to this subscriber station by network.If network can not receive request reliably, network allowable resource and/or determine suboptimal transmission parameter then.Therefore, the method and apparatus that needs a kind of reliability of the control information that promote this type of reception.
Summary
An a kind of aspect of network entity is disclosed.This network entity comprises the processor that is configured to based on from the transmission data rate on the wireless channel of feedback regulation from the base station to this subscriber station of subscriber station, this feedback relates to radio channel state, and this processor is configured to further determines the alternate data rate at the one or more transmission on the wireless channel from the base station to the subscriber station when this feedback is damaged.
An a kind of aspect of base station is disclosed.This base station comprises the transceiver that is configured to support with the wireless channel of subscriber station; And be configured to based on from the feedback regulation of subscriber station processor at the transmission data rate to the wireless channel of this subscriber station, this feedback relates to radio channel state, this processor is further configured based on one or more criterions determines whether feedback is damaged, and, then use at the method for determining the alternate data rate to one or more transmission of this subscriber station if like this.
A kind of various aspects of network entity can be implemented in computer-readable medium, this computer-readable medium comprises and can be carried out to fulfil a kind of method based on the transmission data rate on the wireless channel of regulating and control from the feedback of subscriber station from the base station to this subscriber station by processor that this feedback relates to radio channel state.This method comprises the feedback that reception has been damaged, and determines the alternate data rate in response to this feedback of having damaged at the one or more transmission from the base station to the subscriber station.
An a kind of aspect of the method based on the transmission data rate on the wireless channel of regulating and control from the feedback of subscriber station from the base station to this subscriber station is disclosed.This feedback relates to radio channel state.This method comprises the feedback that reception has been damaged, and determines the alternate data rate in response to this feedback of having damaged at the one or more transmission from the base station to this subscriber station.
Brief Description Of Drawings
Fig. 1 is the functional block diagram that an example of cordless communication network is shown;
Fig. 2 is the functional block diagram that an example of base station in the cordless communication network and subscriber station is shown;
Fig. 3 is the functional block diagram that an example of base station controller (BSC) in the cordless communication network and base station is shown;
Fig. 4 is the functional block diagram of an example that the hardware configuration of the base station in the cordless communication network is shown;
Fig. 5 A illustrates a kind of network entity to wipe the flow chart of an example of determining the method for alternate data rate at the transmission from the base station to the subscriber station in response to data transfer rate control (DRC);
Fig. 5 B is a kind of logic diagram of determining the device of alternate data rate at the transmission from the base station to the subscriber station of wiping in response to DRC;
Fig. 6 A is the flow chart that an additional thread of the method for being described among Fig. 5 A is shown;
Fig. 6 B is the block diagram that one of the device described among Fig. 5 B replenishes thread;
Fig. 7 A illustrates to be based in part on the flow chart that affirmation (ACK) message that is received from subscriber station is determined the method for alternate data rate among a kind of Fig. 5 A; And
Fig. 7 B is based in part on the logic diagram that the ACK message that is received from subscriber station is determined the device of replacement data rate among a kind of Fig. 5 B.
Specify
In cordless communication network, the reliability of the transmission from the base station to the subscriber station depends on the speed (" data transfer rate ") of transmitting power and transmitted bit.Undoubtedly, if maximum available launch power and lowest data rate are used in the base station, then the most reliable transmission will take place.Although it is fine from the such effect of the viewpoint of reliability, but it may be undesirable being to use low data rate, because this has limited the user's that can serve a base station number, and limited the amount that these users may data downloaded in the preset time section.
Therefore, most of wireless networks change transmitting powers and/or data transfer rate are to reach the compromise or balance between performance and the cost.An example is High Data Rate (HDR) system of being described by the telecommunications industry association that is also referred to as CDMA2000 xEV-DO (TIA) standard " cdma2000 High Rate Packet Data Air Interface Specification (cdma2000 high rate packet data air interface standard) ".The IS-856 system comes coordination performance and cost with the following methods.The base station is launched with total power and is adjusted data transfer rate with in response to channel conditions.Channel conditions relates to such as attributes such as short-period fading, shadow effect and other battery signal propagation phenomenons.Channel conditions is sentenced noise, error rate, signal strength signal intensity and other this type of signal attribute in the base station form manifests.
Channel conditions influences the data transfer rate that subscriber station can receive data.In one embodiment, subscriber station provides the feedback that relates to channel conditions to the base station.This type of feedback can be the measurement of channel conditions, maybe can be based on the data transfer rate that channel conditions calculates.Subscriber station can use measured value and/or history value to estimate or predict the channel conditions in future.
In the IS-856 system, each subscriber station provides the feedback that relates to channel conditions to the base station on data transfer rate control (DRC) channel.This feedback is called as DRC " value ", " drc signal ", " DRC index ", like that.The content of DRC value and DRC channel, form, use and other details illustrate in such as lists of references such as IS-856 standard documents.Standard I S-856-version 0 and IS-856 revised edition A have defined the default mapping between each DRC value and the one or more compatible data rate.But this mapping concentrated area can be used network and subscriber station, or can be brought in one or more network entities and/or the subscriber station locally.Network uses the DRC value of subscriber station to select at the transmission of standing to this specific user from the base station on the forward link data transfer rate of a compatibility.Similarly, one of data transfer rate that the DRC value that following forward link transmissions from the base station of subscriber station expection will be used and this subscriber station sends recently is compatible.
Under some channel conditions, may be damaged to the feedback of base station from subscriber station.In the IS-856 system, the feedback of damage shows as the form that DRC wipes." DRC wipes " is to take place in the time of can not correctly receiving the DRC value of subscriber station in the base station." DRC wipes " is meant wrong, ambiguity, that lose or invalid DRC value.In this case, the following transmission from this base station of subscriber station expectation can be carried out under the data transfer rate of DRC value that this subscriber station sends (but failure) recently being suitable for.Yet, lacked that the nearest DRC value of subscriber station hinders the network selecting optimal data rate or the data transfer rate of subscriber station desired (that is request).If wrong data transfer rate is used in the base station, then subscriber station can not correctly receive the decode the transmission of base station.The IS-856 subscriber station is not attempted blind check base station data rate.
Under afore-mentioned, the transmission from the base station to subscriber station may get nowhere.This is undesirable, correctly communicates by letter with the base station because this has hindered subscriber station, also because of being that cost requesting subscriber station repeating transmission DRC value has further postponed to communicate by letter with bandwidth, battery electric quantity and time.It is undesirable that DRC wipes, because they can cause the application of delay-sensitive that higher and unacceptable stand-by period and bandwidth waste are arranged.
Hardware environment
Fig. 1 is the functional block diagram that an example of cordless communication network 100 is shown.In one embodiment, network 100 can be implemented as High Data Rate (HDR) wireless network, such as TIA IS-856 version 0 or TIA IS-856 revised edition A type network.This type of network receives Email, carries out Internet surfing and exchange for other data for wireless subscriber station for example is useful.In addition, network 100 can be implemented as the system for wireless cellular telephony according to TIA standard I S-95.The IS-95 standard utilizes code division multiple access (CDMA) modulation technique to compare the wireless voice call that in the early time wireless communication technology has bigger capacity and more sane performance.
Each subscriber station 114 is shown in network 100 and roams everywhere.Subscriber station 114 can be radio telephone, laptop computer, PDA(Personal Digital Assistant), data transceiver, modulator-demodulator, beep-pager, camera, game console or any other suitable mobile communication equipment.Those skilled in the art may be called subscriber station 114 mobile phone, Wireless Telecom Equipment, user terminal, access terminal, subscriber equipment, mobile radio station, mobile unit, subscriber unit, mobile radio, radio telephone, wireless station, wireless device or other certain term.Running through this open each conception of species of describing is intended to be applicable to all Wireless Telecom Equipments and is not limited to its concrete name.
As shown in fig. 1, call and other communication are by carrying out via radio frequency (RF) electromagnetic signal channels 112A swap data between subscriber station 114A and base station 110A.In the HDR background, HDR communication is by exchanging Internet protocol (IP) grouped data to relay to internet 101 or to carry out such as other certain packet data network (not shown) such as company or other closed network between subscriber station 114B and base station 110B.The example of grouped data comprises the IP datagram that is used for such as application such as visit web page and retrieving electronic mails.This type of packet data application can directly be moved on subscriber station 114B, or subscriber station 114B can moved as on the stand-alone computer equipment of radio modem.As shown in fig. 1, subscriber station 114B is via RF electromagnetic signal channels 112B and wireless network 100 intercommunication grouped datas.
In an embodiment of network 100, all addressable mapping tool in each base station 110 is such as the mapping tool 227 that illustrates relatively with base station 110A.Mapping tool 227 provides the mechanism of a kind of DRC of input value and reception compatible data rate to base station 110A.In other words, this mapping tool provides a kind of in the DRC value and give the preassigned assignment matrix of changing between the data transfer rate of those DRC values.Relation between DRC value and the compatible data rate is to set up by the design of network 100, and can be by upgrading shared central mapping tool 227 (in one example) or changing by renewal being propagated into local mapping tool 227 (in another example).
As an example more specifically, mapping tool 227 can provide the another kind between multi-user's packet transmission format of a kind of mapping between DRC value and the compatible single user packet transmissions form and DRC value and compatibility to shine upon.Single user and multi-user's transmitted in packets are more specifically described following.
Lift several examples, mapping tool 227 can comprise suitable relational database, look-up table, chained list, index or other data structure.Mapping tool 227 can be implemented as data structure or another equipment that is comprised in machine, circuit, software routines, firmware or the machine readable storage.In an example, mapping tool 227 can be the autonomous device that can be visited by direct electrical connection, internet, radio frequency link, public switch telephone network (PSTN) or other coupling by base station 110A (as shown in fig. 1 but not any meaning that limits of tool).In this example, can have can be for a plurality of mapping tool of base station 110 independent visits or the central mapping tool that can supply all base stations 110 to visit.In different examples, can be integrated into such as in the relevant base station 110 such as base station 110A such as mapping tool such as 227.
Each base station 110 all is coupled to base station controller (BSC) 106, the Bidirectional flow of information between BSC106 guiding base station 110 and the diverse network facility 104 (in following description).The various functions that BSC106 carry out to allow mobile communication to take place comprise that coordinates user station 114 changes hand between all base stations 110.In enabling the network of IS-856, BSC106 can comprise Packet Control Function (PCF) the module (not shown) that is used for base station 110 exchange IP packets.Each BSC106 can use such as commercial now conventional wireless network 100 employed hardware and realize.
In an alternative embodiment of network 100, mapping function can be carried out by BSC106.By at the BSC place DRC value being mapped to data transfer rate, the subscriber station 114 of communicating by letter with a plurality of base stations 110 can be experienced the performance of lifting under bad channel conditions.In this embodiment, the DRC value that is generated and be sent to a plurality of base stations 110 by subscriber station 114 can be combined at the BSC106 place.The mode of combination DRC value can change according to concrete application and the total design constraint that is added on system.As example, BSC106 can select one of these a plurality of DRC values to come the mapping (enum) data rate.In other words, if BSC has the available DRC value from other base station 110, then the DRC from a base station 110 wipes the influence that minimum will be arranged systematic function.Perhaps, BSC106 can with from the signal energy combination of the DRC value of a plurality of base stations 110 to promote reliability.Zu He DRC value can be provided for mapping tool 227 at the forward link transmissions specified data rate from a plurality of base stations 110 to subscriber station 114 then.Each BSC106 can have or be implemented as autonomous device or be implemented as the special-purpose mapping tool 312 of the integrated package of BSC106.Perhaps, can be a plurality of BSC central mapping tool 312 is provided.Central authorities' mapping tool 312 can be an autonomous device, can be integrated in BSC106 (as shown in Figure 3) or other network entity, maybe can be distributed between a plurality of network entities.
As mentioned above, BSC106 provides the information flow between the base station 110 and the network facilities 104.The network facilities 104 can comprise such as mobile switching centre (MSC), MTSO assemblies such as (MTSO).For example, MSC assembly relays voice stream information between BSC106 and PSTN105.The MSC operation is to provide mobility control, call treatment and to call out routing function.As an example, can use data, services IWF (IWF) that the network facilities 104 is connected to PSTN105.
With regard to HDR information (such as IS-856 type system), the network facilities 104 also can comprise such as assembly such as acting on behalf of outside one or more districts.In this background, the network facilities 104 is via link 103 exchange IP data between BSC 106 and one or more local area agency, and link 103 comprises wireless or Wireline T1 or T3 link, optical fiber connection or Ethernet or other IP connection.Local area agency 102 and then be coupled to internet 101.
Fig. 2 is the functional block diagram that the example of base station 110 in the cordless communication network 100 and subscriber station 114 is shown.Subscriber station 114 comprises and will be coupled to the antenna 202 of transceiver 204 from the signal transmission of base station 110.The 204 pairs of signals of transceiver transmission carrying out filtering, amplification also are down-converted to base band with it.Baseband signal is handled by demodulator 206 and decoder 208 earlier, and the data of gained are provided for user interface 209 as a result then.Decoder 208 can use based on the agreement of confirming (ACK) provides index signal to be transmitted in the feedback whether subscriber station 114 places are correctly decoded to base station 110.
Channel conditions can use the pilot signal that is embedded in the forward link transmissions to estimate by subscriber station 114.Pilot signal is a un-encoded, therefore can directly offer channel estimator 210 from demodulator 206.Because pilot signal is that priori is known, therefore a copy can be stored in 212 li of memories in the subscriber station 114.Based on pilot signal that receives and the copy that is stored in this pilot signal in the memory 212, channel estimator 210 can provide the feedback of the channel conditions that relates to forward link to base station 110.This feedback can be taked signal to interference and noise ratio (SINR), Carrier interference ratio (C/I), energy per bit noise ratio (E
b/ I
o) or the form of the tolerance of any other adequate types.Feedback can be quantized, and is mapped to the DRC value, and offers modulator 216.Use spread processing, modulator 216 will be from the coded data of user's interface 209, be placed on the suitable channel from the DRC value of channel estimator 210 with from the ACK/NAK message of decoder 208, and they are offered transceiver 204 to send to base station 110 on reverse link by antenna 202.
Can be provided for encoder 214 at each time slot from the DRC value of channel estimator 210 with from the ACK message of decoder 208.In lxEV-DO (version A), forward link transmissions is divided into the frame of 20 milliseconds (ms), and each frame has the time slot of 16 1.25ms.Alternative embodiment can adopt other scheme, such as according to predetermined calling/response relation, the timetable of predesignating or other arrangement.The form of various DRC values, content and power are known in association area, example is those DRC values of describing in one or more in the middle of the following material: " the cdma2000 High Rate Packet Data AirInterface Specification " that (1) is worked out by the 3GPP2 tissue (numbering 3GPP2 C.S0024-A), (2) are also referred to as the TIA standard I S-856 of CDMA20001xEV-DO.
The antenna 218 that transmits by 110 places, base station from the reverse link signal of subscriber station 114 receives, and is provided for transceiver 220.Transceiver 220 transmits filtering, amplification with these signals, and it is down-converted to base band.Baseband signal is handled by demodulator 222, and is provided for decoder 224.Decoder 224 is handled these signals, by circuit transceiver 225 data is offered the BSC106 (not shown), and DRC value and ACK/NACK message are offered controller 226.
228 pairs of encoders are carried out various signal processing functions via circuit transceiver 225 from the data that the BSC106 (not shown) receives.These signal processing functions are to carry out down at data transfer rate that is provided with by controller 226 and data packet format (for example, single packet format or many packet formats).Coded signal is provided for modulator 230 and is for further processing, and is sent to transceiver 220 again with filtering, amplification and upconvert to and be fit to by the frequency of antenna 218 to subscriber station 114 forward link transmissions.
Fig. 3 is the functional block diagram that an example of BSC106 in the cordless communication network 100 and base station 110 is shown.In this example, BSC106 is at forward link transmissions specified data rate and data packet format from one or more base stations 110.For ease of explanation, only show a base station 110.BSC106 and base station 110 use circuit transceiver 302 and 225 to come mutual communication respectively.BSC106 also comprises a plurality of selector elements 304, but only shows one for simplicity among Fig. 3.Selector element 304 is assigned communicating by letter between the one or more base stations 110 of control and the subscriber station 114.If do not assign selector element 304 to a subscriber station 114 as yet, then call control processor 306 will be indicated 110 calling user stations 114, base station.Selector element 304 is by network interface or modulator-demodulator 308 and diverse network facility (not shown) interface.
In this embodiment of network 100, recover the DRC value and provide it to DRC assembler block 310 from decoded data stream at selector element 304 places.The output of DRC assembler block 310 is provided for mapping tool 312, is switched to corresponding data transfer rate and data packet format in the DRC of this combination value.This data transfer rate and data packet format are provided for the base station 110 that the selector element 304 among the BSC106 is fitted with the route bout.In configuration shown in Figure 3, this data transfer rate and data packet format are provided for selector element 304, the latter and then this information sent to controller 226 in the base station 110.
Fig. 4 is the block diagram that the hardware configuration of base station 110 is shown.Base station 110 comprises via the processor 226 of system bus 404 with a plurality of devices communicatings.Processor 226 can be the one or more processing entities that realize with hardware, software, firmware or its combination in any.As example, processor 226 can be realized with the microprocessor of supporting a plurality of software application.One or more in these software application are used to realize the function (referring to Fig. 2) such as various signal processing functions such as modulation, demodulation, Code And Decode and controller.This of support controller function (a bit) software application can comprise application programming interfaces (API) or other certain interface of access map instrument 227.In an alternative embodiment of processor 226, microprocessor can be unloaded to one or more signal processing functions on digital signal processor (DSP) or other certain processing entities.
As the alternative based on the framework of software, processor 226 utilogics are realized.According to the specific requirement of aspects such as the speed of being applied in, expense, operating cost, this logic available dedicated integrated circuit (ASIC), field programmable gate array (FPGA), programmable logic array (PLA), programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components or its combination in any realize.
The mode of realization base station 110 will depend on concrete application and be added on the design constraint of whole system.Those skilled in the art can recognize hardware, firmware and software interchangeability in these cases, and how best every kind of concrete application be realized described function.
Operating environment
Fig. 5 A illustrates an example of the method for being carried out by base station or any other network entity 500.For ease of explanation, but any qualification of tool meaning ground not, the example to Fig. 5 A in the background of above-mentioned Fig. 1 is described.In this background, method 500 is carried out by each base station.
Wide in range, according to an embodiment of method 500, whether each DRC value that base station 110 is estimated from subscriber station 114 is wiped free of with definite its.If a DRC value is wiped free of, then the method for determining to substitute DRC value (in order to using) when selecting the suitable data rate is used in base station 110, or in another embodiment, the alternate data rate is directly determined in base station 110.Otherwise if the DRC value is effective, then this effective DRC value is used in base station 110 when selecting the suitable data rate.
Consider that as another kind base station 110 can be defined in base station 110 with the 114 relevant execution of method 500 and subscriber station and comprise the occasion of any wait to the data of these subscriber station 114 transmissions.In this embodiment, the starting of method 500 can be further limited data but also the occasion of these data time of existing predetermined minimum length in the transmit queue of base station 110 that has wait to send to subscriber station 114 in base station 110 not only.
Consider that as another base station 110 can be limited to the execution of method 500 transmission such as the time limit data of some predefine class such as IP phone (VoIP) data.
Referring now to Fig. 5 A method 500 is discussed.In step 501, feedback is received.In step 502, the DRC value is estimated to determine whether that DRC has taken place to be wiped in base station 110.Whether think that the DRC value is wiped free of the evaluation of for example depending on the DRC value, such as base station 110 decodabilities or with comparison or any method that other can be conceived of predetermined example, pattern, agreement, signal strength threshold.
If base station 110 concludes that in step 502 current DRC value is not to wipe, then current DRC value is regarded as effectively, and processed in step 504.That is, in step 504, base station 110 in mapping tool 227 index DRC value with the identification data rate, and in some cases, also sign and the corresponding data packet format of DRC value.Next, in step 506, data transfer rate and the data packet format from mapping tool 227 used in one or more signal transmission of base station subtend subscriber station 114.For example, but the transmission next time of subtend subscriber station 114, to the transmission of ensuing given number of times, to the given time period, take place, data transfer rate and the data packet format of using selection step 504 such as wipe until receive next DRC value or DRC from subscriber station 114 until a given incident.After step 506, method 500 turns back to step 502 to estimate next the DRC value that receives (or expection receives) from subscriber station 114.
If 110 sign generation DRC wipe i.e. Fan Kui damage, then base station 110 execution in step 508 in step 502 base station.In step 508, base station 110 determines whether the DRC value of wiping satisfies some criterion.As example, before step 510 was determined the alternate data rate, base station 110 can require a plurality of DRC to wipe.In this example, will can not determine the alternate data rate before two or more the wiping that the regulation run length has taken place (comprising current wiping).Otherwise if do not satisfy this criterion in step 508, then base station 110 will be to the forward link transmissions (step 512) of current time slots scheduling to subscriber station 114.
If 110 sign DRC wipe in step 502 base station, and wipe at this DRC of step 508 and to satisfy some criterion, then base station 110 execution in step 510.Wide in range, in step 510, the alternate data rate is determined in base station 110.As an optional intermediate steps, in step 510, base station 110 determines that one replaces the alternative DRC value of wiping the DRC value, utilizes mapping tool 227 to identify replacement data rate corresponding to this alternative DRC value then.In any situation, step 510 is used this alternate data rate in this base station 110 at the one or more signal transmission to subscriber station 114, and then is got back to step 502 to estimate next DRC value all succeeded by step 506.But the transmission next time of subtend subscriber station 114, next given number of times transmission, to preset time section, until a given incident take place, until receive use (step 510) these alternate data rates such as next DRC value or DRC wipe from subscriber station 114.
As a kind of enhancing to step 510, packet can be formatted as the multi-user's grouping or the combination of multi-user and single user grouping.With regard to " single user " grouping, each grouping is intended to be sent to a specific user and stands 114." multi-user " grouping is directed to one group of a plurality of subscriber station 114.Multi-user's grouping can comprise at maximum 8 the more high-rise groupings up to 8 users.Standard I S-856 1xEV-DO (revised edition A) has described the details of single user and multi-user's grouping.
In an example of step 510, single user grouping and multi-user's grouping are adopted to the transmission of subscriber station 114 in cause base station 110.In another example of step 510, transmission in the future can only use the multi-user to divide into groups.In any situation, in multi-user's grouping all is included in, the definite alternate data rate that can work because if step 510 fails then is defined in grouping unique subscriber station 114 will emit wastes this time transmission when this subscriber station 114 can not successfully be decoded these data risk.This is because each subscriber station 114 can be handled the packet that (" decoding ") receives under the predefined data transfer rate of determining according to hardware, firmware or miscellaneous equipment configuration.Although subscriber station 114 (for example can be decoded under the data transfer rate that predefined data transfer rate is low than this in addition, under the version A of 1xEV-DO) grouping that sends, but in the incorrect situation of alternate data rate, base station 110 will have better chance still can arrive some subscriber stations 114 by using multi-user's grouping.
To concrete grammar that determine the alternate data rate in the step 510 be described now.As mentioned above, can be by directly determining the alternate data rate or determining to substitute the DRC value and come execution in step 510 to obtain the alternate data rate as an intermediate steps and mapping.In one example, step 510 is to use " minimum available " scheme to realize.That is, in step 510, minimum available data rate data transfer rate is as an alternative selected in base station 110." available " but be meant the minimum rate of application standard (such as IS-8561xEV-DO, the revised edition A) regulation of being observed base station 110, or alternatively, refer to that pre-programmed subscriber station 114 always attempts certain predetermined minimum data rates of decoding.Alternatively, under " minimum available " mode, in step 510, minimum available DRC value DRC value is as an alternative selected in base station 110.Aforementioned schemes is guarded, and is successful probably to subscriber station 114 communications the time therefore.But if the higher data transfer rate of conditions permit, then base station 110 is not utilizing bandwidth as far as possible expeditiously.
Continue the discussion of step 510, another example is provided, its use " known to last " scheme.At this, step 510 be by select the last data transfer rate that obtains from effective DRC value and use this data transfer rate as an alternative data transfer rate realize.Alternatively, under " last known to " scheme, in step 510, base station 110 use from subscriber station 114 receive last known to the DRC value be mapped to one and substitute the DRC value.
The data transfer rate of " well " known to the benefit of " known to last " discussed above scheme has been to utilize recently.But, if continuing to receive DRC from subscriber station 114, base station 110 wipes, then the reliability of this scheme is passed in time and is reduced, because channel conditions may change, thereby the DRC value known to reducing at last is still the probability of correct DRC value.Therefore, as a kind of expansion to these schemes, base station 110 can reduce alternate data rate (or DRC value) by function according to the rules, until receive next effective DRC value from subscriber station 114, after this uses so effective DRC value in step 506.This scheme expection channel conditions is passed the probability of deterioration in time.For example, base station 110 can be according to reduce to be initially at the alternate data rate of selecting in the step 510 such as one of following prescribed function: (1) each transmission reduces a fixing or variable delta, (2) time per unit reduces a fixing or variable delta, (3) according to the linearity or the nonlinear mathematics function of a pre-programmed, (4) basis is pushing away or is drawing the instruction that receives from network on the basis, or (5) are in response to other function of operating conditions.In the situation of DRC value known to using at last, base station 110 can be used and the aforementioned alternative DRC value that similarly reduces to plan to reduce initial selected.
In at least one embodiment of base station 110, method 500 can comprise the individual threads 600 shown in Fig. 6 A.The temporary variable " DRC TEMP " that base station 100 can randomly generate based on using method 600 in the step 510 of Fig. 5 A is determined the alternate data rate.
" DRC_TEMP " is to use a state variable of the method storage of thread 600, and can represent a different value during each time slot.The method of thread 600 (Fig. 6 A) can be carried out at each time slot, and generates variable " DRC_TEMP ".This means that the value of " DRC_TEMP " is maintained and upgrade at each time slot.Thread 600 is initialised in step 602, and determines whether that in step 502 existing DRC value is wiped free of.If determine that this DRC value is wiped free of, then the alternate data rate in the step 510 of Fig. 5 A can be reduced the value " DRC_TEMP " (step 606) of being stored.If there is not forward link transmissions (step 512 of Fig. 5 A), then the alternate data rate is stored in (step 610) in the memory.
If determine that in step 502 DRC is not wiped free of, then in step 608, this state variable is reset, and promptly " DRC_TEMP " is set to the DRC value that receives at this time slot.Thus, base station 110 with good grounds prescriptive procedure that uses in conjunction with above-mentioned " known to last " scheme or the options that change the alternate data rate based on this nonce " DRC_TEMP " of being similar to.
In step 510 (referring to Fig. 5 A), use the value of in thread 600, determining possibly than scheme determines that alternate data is more reliable based on " known to last ", because it has considered that satisfying DRC in step 508 (referring to Fig. 5 A) wipes the required time delay of criterion.
As a kind of alternative of in step 506, using " minimum available " or " known to last " DRC value, method 500 can at first be relaxed be used to determine whether to take place the threshold value that DRC wipes in step 502, utilizes this threshold value of relaxing to reappraise this DRC value then.This can realize to generate the most possible DRC value by reducing the DRC erase threshold.More specifically, the DRC erase threshold is lowered, and generates single effective DRC value until base station 110.The DRC value of gained becomes the alternative DRC value in the step 510 as a result, and this value is mapped to the alternate data rate subsequently.
To discuss to a kind of alternative of in step 510, determining the alternate data rate in conjunction with Fig. 7 A now.Use this scheme, the alternate data rates of being determined by base station 110 depend on that whether forward link transmissions is fail success decoding (receiving NAK) or the successfully re-transmission of the packet of decoding (receiving ACK) of subscriber station 114.Referring to Fig. 7 A, base station 110 receives DRC feedback 501, and determines whether to have taken place ACK/NAK in step 702 and wipe.Whether think that ACK/NAK message is wiped free of the evaluation that for example can be depending on this ACK/NAK message, such as base station 110 decodabilities or with comparison or any method that other can be conceived of predetermined example, pattern, agreement, signal strength threshold.
If 110 determine that current ACK/NAK message is wiped free of in step 702 base station, then an alternate data rate is determined in base station 110 in as the above step of describing in conjunction with Fig. 5 A 510.That is base station 110 uses " minimum available " or " known to last " DRC value to determine the alternate data rate.Alternatively, base station 110 can be determined " minimum available " or " last known to " DRC value and it is mapped to the alternate data rate.Scheme is come or definite replacement data rate or definite DRC value if " known to last " used in base station 110, and then it can be passed in time and reduce data transfer rate (or DRC value) to promote the probability of successful forward link signal transmission.As a kind of replacement of " minimum available " or " last known to " scheme, base station 110 can be relaxed and has been used to determine whether to take place the threshold value that DRC wipes.Under any circumstance, in case determined the alternate data rate in step 510 base station 110, it promptly use this alternate data rate in one or more signal transmission of subscriber station 114, promptly turns back to the step 506 among Fig. 5 A.
If 110 determine that current ACK/NAK message is not wiped free of in step 702 base station, then ACK/NAK message is regarded as effectively and is processed.In step 704, base station 110 determines that this message is ACK message or NAK message.In response to NAK message, 110 reduce the current data rate in step 706 base station, and use the data transfer rate of this reduction in the forward link transmissions next time of subtend subscriber station 114, and turn back to the step 506 among Fig. 5 A.Base station 110 can use the prescriptive procedure to determine alternate data rate (or DRC value) to reduce the current data rate with being similar in conjunction with " known to last " scheme.
In response to ACK message, in step 708, an alternate data rate is determined in base station 110 in prescribed limit.In this example, this prescribed limit is a minimum value to send the previous used data transfer rate of forward link transmissions to subscriber station 114, and is maximum with the last effectively data transfer rate of DRC value that is received at base station 110.In other words, base station 110 increases to the data transfer rate of forward link transmissions in response to ACK message the maximum of the last effective DRC value that is received corresponding to base station 110.This increasing data rates is used in base station 110 forward link transmissions next time of subtend subscriber station 114 then, and turns back to the step 506 among Fig. 5 A.
The method of above-mentioned Fig. 5 A-7A can add functional module by the related device shown in Fig. 5 A-7B and carry out.In other words, the step 501 shown in Fig. 5 A, 502,504,506,508,510 and 512 adds functional module 1501,1502,1504,1506,1508,1510 and 1512 corresponding to the device shown in Fig. 5 B.Step 602 shown in Fig. 6 A, 502,606,608 and 610 is corresponding to the functional module shown in Fig. 6 B 1602,1502,1606,1608 and 1610.Step 501 shown in Fig. 7 A, 506,510,702,704,706 and 708 adds functional module 1501,1506,1510,1702,1704,1706 and 1708 corresponding to the device shown in Fig. 7 B.
Other embodiment
Although foregoing disclosure shows a plurality of illustrative embodiment, what those skilled in the art will may be obvious that is, can carry out various changes and modification and can not depart from as the scope of the present invention by the claims definition at this.In addition, although key element of the present invention may be to describe or claimed with singulative, plural form is also conceived, unless stated clearly and be defined in singulative.In addition, it will be recognized by those of ordinary skills operating sequence and be and set forth with given certain order so that explain and claimed, but the present invention has conceived the various changes that surmount this type of certain order.
In addition, those of ordinary skill in the related art will be understood that information and signal can use various technology and skill to represent.For example, any data, instruction, order, information, signal, bit, code element and the chip of citation can be represented by voltage, electric current, electromagnetic wave, magnetic field or magnetic particle, light field or light particle, other items or aforesaid combination herein.
In addition, those of ordinary skills can recognize that any illustrative components, blocks described herein, module, circuit, process steps or other function can be implemented as electronic hardware, firmware, computer software or its combination.Recognize this interchangeability of hardware and software, various Illustrative components, piece, module, circuit and step above be to do general the description with the form of its function.This type of function is implemented as the design constraint that hardware or software depend on concrete application and is added on whole system.The technical staff can realize above-mentioned functions by different way at every kind of concrete application, but this type of realizes making a strategic decision should not be interpreted as causing departing from scope of the present invention.
Various illustrative components, blocks, module and the circuit of describing in conjunction with these embodiment disclosed herein can be realized with the combination in any that general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or its are designed to carry out function described herein or carry out.General processor can be a microprocessor, but in alternative, processor can be processor, controller, microcontroller or the state machine of any routine.Processor also can be implemented as the combination of computing equipment, for example, and DSP and the combination of microprocessor, a plurality of microprocessor, one or more microprocessors of cooperating or any other this type of configuration with the DSP core.
The step of the method for describing in conjunction with these embodiment disclosed herein can be embodied directly in hardware, in the software module of being carried out by processor or implement in the two combination.Software module can reside in the storage medium of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, removable dish, CD-ROM or any other form as known in the art.Exemplary storage medium can be coupled to processor so that this processor can from/to this storage medium read/write information.In alternative, storage medium can constitute an integral body with processor.Processor and storage medium can reside among the ASIC.ASIC can reside in the Wireless Telecom Equipment.In alternative, processor and storage medium can be used as discrete assembly and reside in the Wireless Telecom Equipment.
In addition, providing the above explanation to the disclosed embodiments is in order to make any technical staff in this area all can make and use the present invention.Various modifications to these embodiment will be conspicuous for those skilled in the art, and defined herein general principle can be applied to other embodiment and can not depart from the spirit or scope of the present invention.Thus, the present invention is not intended to be defined to shown these embodiment herein, but should be consistent with the scope of the broad sense that meets principle disclosed herein and novel feature.
Use word " exemplary " to represent " playing the effect of example, example or explanation " herein.The embodiment that is described as " exemplary " herein must be interpreted as being better than or surpasses other embodiment.
Claims (54)
1. network entity comprises:
Processor, be configured to based on the transmission data rate of feedback regulation on wireless channel from the base station to described subscriber station from subscriber station, described feedback relates to the situation of described wireless channel, and described processor is further configured when described feedback is damaged determines an alternate data rate at the one or more transmission on the wireless channel from described base station to described subscriber station.
2. network entity as claimed in claim 1 is characterized in that, described processor is further configured:
Determine whether to satisfy the damage criterion.
3. network entity as claimed in claim 2 is characterized in that, described processor is further configured:
If satisfy described damage criterion, then send described alternate data rate on the forward link.
4. network entity as claimed in claim 1 is characterized in that described network entity comprises described base station, and described base station has the transceiver that is configured to support with the wireless channel of described subscriber station.
5. network entity as claimed in claim 1 is characterized in that, described feedback comprises data transfer rate control (DRC) value.
6. network entity as claimed in claim 5 is characterized in that, described DRC value comprise from the combination DRC value of a plurality of base stations of described subscriber station communications.
7. network entity as claimed in claim 5 is characterized in that, described processor is further configured based on one or more criterions determines that described feedback is damaged, and described one or more criterions comprise that DRC wipes.
8. network entity as claimed in claim 7 is characterized in that, described processor is further configured by relaxing determines described alternate data rate to the decoding request of DRC value to eradicate that DRC wipes and the DRC value of gained as a result is mapped to alternative DRC value.
9. network entity as claimed in claim 7 is characterized in that, described one or more criterions further require described DRC wipe with receive from described subscriber board at last known to a minimum time section is arranged between the DRC value.
10. network entity as claimed in claim 9, it is characterized in that described processor is further configured at described DRC and wipes and transmission on the wireless channel of inhibition from described base station to described subscriber station wiped in the last effectively minimum time Duan Shangwei past tense between the DRC value in response to described DRC.
11. network entity as claimed in claim 5 is characterized in that, described processor is further configured by determining to substitute the DRC value and described alternative DRC value is mapped to described alternate data rate to determine described alternate data rate.
12. network entity as claimed in claim 11 is characterized in that, described processor is further configured into the minimum available DRC value of selection as described alternative DRC value.
13. network entity as claimed in claim 11 is characterized in that, described processor be further configured into selection from described subscriber station receive last known to the DRC value as described alternative DRC value.
14. network entity as claimed in claim 5 is characterized in that, described processor is further configured into the minimum available data rate of selection as described alternate data rate.
15. network entity as claimed in claim 5 is characterized in that, described processor be further configured into selection at receive from described subscriber station last known to the data transfer rate of DRC value as described alternate data rate.
16. network entity as claimed in claim 1 is characterized in that, described processor is further configured when described feedback continues by damage the one or more transmission increments ground from described base station to described subscriber station is reduced described alternate data rate.
17. network entity as claimed in claim 1 is characterized in that, described processor is further configured into supervision from the additional feedback of described subscriber station decoding of relating to of described subscriber station from the ability of the transmission of described base station, wherein:
Described processor be configured to described feedback continue to be damaged and described subscriber station can decode transmission the time to the described alternate data rate of the increase of the one or more transmission increments ground from described base station to described subscriber station; And
Described processor is configured to continue to be damaged and described subscriber station reduces described alternate data rate to the one or more transmission increments ground from described base station to described subscriber station can not decode transmission the time in described feedback.
18. network entity as claimed in claim 1 is characterized in that, described processor is further configured when described feedback continues by damage the one or more transformats from described base station to described subscriber station is changed into many packet formats.
19. a base station comprises:
Transceiver is configured to support the wireless channel with subscriber station; And
Processor, be configured to based on data transfer rate from the transmission to the wireless channel of described subscriber station of the feedback regulation of described subscriber station, described feedback relates to the situation of described wireless channel, described processor be further configured based on one or more criterions determine described feedback whether by damage and under the situation that described feedback is damaged at determining an alternate data rate to one or more transmission of described subscriber station.
20. base station as claimed in claim 19 is characterized in that, described feedback comprises data transfer rate control (DRC) value.
21. base station as claimed in claim 20 is characterized in that, described one or more criterions comprise that DRC wipes.
22. base station as claimed in claim 21 is characterized in that, described processor is further configured by relaxing determines described alternate data rate to the decoding request of DRC value to eradicate that DRC wipes and the DRC value of gained as a result is mapped to alternative DRC value.
23. base station as claimed in claim 21 is characterized in that, described one or more criterions further require described DRC wipe with receive from described subscriber station at last known to a minimum time section is arranged between the DRC value.
24. base station as claimed in claim 23, it is characterized in that described processor is further configured at DRC and wipes and transmission on the wireless channel that is suppressed to described subscriber station wiped in the last effectively minimum time Duan Shangwei past tense between the DRC value in response to described DRC.
25. base station as claimed in claim 19 is characterized in that, described processor is further configured by determining to substitute the DRC value and described alternative DRC value is mapped to the alternate data rate to determine described alternate data rate.
26. base station as claimed in claim 25 is characterized in that, described processor is further configured into the described minimum available DRC value of selection as described alternative DRC value.
27. base station as claimed in claim 25 is characterized in that, described processor be further configured into selection from described subscriber station receive last known to the DRC value as described alternative DRC value.
28. base station as claimed in claim 19 is characterized in that, described processor is further configured into the minimum available data rate of selection as described alternate data rate.
29. base station as claimed in claim 19 is characterized in that, described processor be further configured into selection at receive from described subscriber station last known to the data transfer rate of DRC value as described alternate data rate.
30. base station as claimed in claim 19 is characterized in that, described processor is further configured in described feedback and continues to be reduced described alternate data rate by one or more transmission increments ground of the described subscriber station of damage hour hands subtend.
31. base station as claimed in claim 19 is characterized in that, described processor is further configured into supervision from the additional feedback of described subscriber station decoding of relating to of described subscriber station from the ability of the transmission of described base station, wherein:
Described processor is configured to continue to be damaged and the described alternate data rate of one or more transmission increments ground increase of described subscriber station described subscriber station of subtend can decode transmission the time in described feedback; And
Described processor is configured to continue to be damaged and one or more transmission increments ground of described subscriber station described subscriber station of subtend can not decode transmission the time reduces described alternate data rate in described feedback.
32. base station as claimed in claim 19 is characterized in that, described processor is further configured when described feedback continues by damage and will turns to many packet formats to one or more transformats of described subscriber station.
33. computer-readable medium of implementing instruction repertorie, instruction repertorie can be carried out to realize based on the method from the transmission data rate on the wireless channel of feedback regulation from the base station to the subscriber station of subscriber station by processor, described feedback relates to the situation of described wireless channel, and described method comprises:
Receive the feedback of damage; And
Feedback in response to described damage is determined an alternate data rate at the one or more transmission from described base station to described subscriber station.
34. computer-readable medium as claimed in claim 33, it is characterized in that, described feedback comprises data transfer rate control (DRC) value, and described method further comprises based on one or more criterions determines that described feedback is damaged, and described one or more criterions comprise that DRC wipes.
35. computer-readable medium as claimed in claim 34, it is characterized in that described processor is further configured by relaxing determines described alternate data rate to the decoding request of described DRC value to eradicate described DRC and wipe and the DRC value of gained as a result is mapped to described alternative DRC value.
36. computer-readable medium as claimed in claim 34 is characterized in that, described one or more criterions further require described DRC to wipe and from described subscriber station receive last known to a minimum time section is arranged between the DRC value.
37. computer-readable medium as claimed in claim 33 is characterized in that, described feedback comprises data transfer rate control (DRC) value, and described alternate data rate is determined by selecting an alternative DRC value and described alternative DRC value being mapped to the alternate data rate.
38. computer-readable medium as claimed in claim 37 is characterized in that, described alternative DRC value is minimum available DRC value.
39. computer-readable medium as claimed in claim 37 is characterized in that, described alternative DRC value be from described subscriber station receive last known to the DRC value.
40. computer-readable medium as claimed in claim 33 is characterized in that, described alternate data rate is confirmed as described minimum available data rate.
41. computer-readable medium as claimed in claim 33 is characterized in that, described alternate data rate is confirmed as data transfer rate known to the transmission of described subscriber station last.
42. computer-readable medium as claimed in claim 33 is characterized in that, further is included in when feedback continues by damage and will turns to many packet formats to all transformats of described subscriber station.
43. one kind based on the method from the data transfer rate of the transmission on the wireless channel of feedback regulation from the base station to described subscriber station of subscriber station, described feedback relates to the situation of described wireless channel, and described method comprises:
Receive the feedback of damage; And
Feedback in response to described damage is determined an alternate data rate at the one or more transmission from described base station to described subscriber station.
44. method as claimed in claim 43 is characterized in that, further comprises:
Determine whether to satisfy the damage criterion.
45. method as claimed in claim 44 is characterized in that, further comprises:
If satisfy described damage criterion, then send described alternate data rate on the forward link.
46. method as claimed in claim 45 is characterized in that, the described step that satisfies the damage criterion that determines whether comprises:
Determined whether to take place two or more damage feedbacks.
47. method as claimed in claim 45 is characterized in that, the step of described definite alternate data rate comprises:
Select minimum available DRC value; And
Described minimum available DRC value is mapped to a data transfer rate.
48. method as claimed in claim 45 is characterized in that, the step of described definite alternate data rate comprises:
The final data rate that selection obtains from an effective DRC value.
49. one kind based on the device from the transmission data rate on the wireless channel of feedback regulation from the base station to described subscriber station of subscriber station, described feedback relates to the situation of described wireless channel, and described device comprises:
Be used to receive the device of the feedback of damage; And
Be used for determining at one or more transmission the device of an alternate data rate from described base station to described subscriber station in response to the feedback of described damage.
50. as being used to regulate and control the device of data transfer rate as described in the claim 49, it is characterized in that, further comprise:
Be used to determine whether to satisfy the device of damage criterion.
51. as being used to regulate and control the device of data transfer rate as described in the claim 50, it is characterized in that, further comprise:
Be used under the situation that satisfies described damage criterion, sending on the forward link the device of described alternate data rate.
52. as being used to regulate and control the device of data transfer rate as described in the claim 51, it is characterized in that, describedly be used to determine whether that the device that satisfies the damage criterion comprises:
Be used to determine whether to take place the device of two or more damage feedbacks.
53. as being used to regulate and control the device of data transfer rate as described in the claim 51, it is characterized in that, describedly be used for determining that the device of alternate data rate comprises:
Be used to select the device of minimum available DRC value; And
Be used for described minimum available DRC value is mapped to the device of a data transfer rate.
54. as being used to regulate and control the device of data transfer rate as described in the claim 51, it is characterized in that, describedly be used for determining that the device of alternate data rate comprises:
Be used to select the device of the final data rate that obtains from an effective DRC value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64936005P | 2005-02-01 | 2005-02-01 | |
| US60/649,360 | 2005-02-01 | ||
| US11/344,698 | 2006-01-31 |
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| Publication Number | Publication Date |
|---|---|
| CN101138187A true CN101138187A (en) | 2008-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800073400A Pending CN101138187A (en) | 2005-02-01 | 2006-02-01 | Method and apparatus for controlling transmission data rate based on feedback related to channel conditions |
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| Country | Link |
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| EP (1) | EP1844568A2 (en) |
| CN (1) | CN101138187A (en) |
| TW (1) | TW200701811A (en) |
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| US8842606B2 (en) * | 2007-08-31 | 2014-09-23 | Koninklijke Philips N.V. | Enhanced multi-user transmission |
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2006
- 2006-02-01 CN CNA2006800073400A patent/CN101138187A/en active Pending
- 2006-02-01 EP EP06720124A patent/EP1844568A2/en not_active Withdrawn
- 2006-02-03 TW TW095103820A patent/TW200701811A/en unknown
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| EP1844568A2 (en) | 2007-10-17 |
| TW200701811A (en) | 2007-01-01 |
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