CN101292456A - Varied transmission time intervals for wireless communication system - Google Patents
Varied transmission time intervals for wireless communication system Download PDFInfo
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- CN101292456A CN101292456A CNA2006800391579A CN200680039157A CN101292456A CN 101292456 A CN101292456 A CN 101292456A CN A2006800391579 A CNA2006800391579 A CN A2006800391579A CN 200680039157 A CN200680039157 A CN 200680039157A CN 101292456 A CN101292456 A CN 101292456A
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Abstract
Embodiments describe a varied transmission time interval in wireless communication system. According to some embodiments is a method for assigning a transmission time interval. The method can include measuring a channel condition and/or a data rate of packet communicated by at least one wireless device. Based in part on the data rate and/or channel condition information, a determination can be made whether to schedule a long transmission time interval or a short transmission time interval to the packet. A long transmission time interval can be scheduled if the channel condition is poor and/or there is a low data rate. A short transmission time interval can be scheduled if the channel condition is good and/or the data rate is high or fast. The method can be repeated for multiple wireless devices. Also included is an alternative interlacing structure that supports both long transmission time intervals and short transmission time intervals.
Description
The cross reference of related application
The application's case is advocated the priority of the 60/711st, No. 145 U.S. Provisional Application case that is entitled as " varied transmission time intervals that is used for wireless communication system " of application on August 24th, 2005, and the full text of described application case is incorporated this paper by reference into.
Technical field
Below describe substantially about cordless communication network, and more particularly about being used for various (varied) Transmission Time Interval size of multi-user radio system forward link and rl transmission.
Background technology
No matter the user may be in what position (for example, family, office, journey are medium) at special time, and many users use the wireless network connected system to communicate.When improving portability and convenience, radio communication device become more and more littler and power from strength to strength to satisfy user's needs.The user has found to comprise many purposes of the radio communication device of cellular phone, PDA(Personal Digital Assistant) and its analog.
Exemplary wireless communication network (for example, adopt frequency division, timesharing and demal technology) comprise that one or more that one or more base stations that cover local are provided and can transmit and receive data in described covering local move (for example, wireless) user's set.Exemplary base station can transmit simultaneously be used to broadcast, a plurality of data flow of multicast and/or unicast services, wherein data flow is can be according to the concern of user's set and the stream of the independent data that receive.
Various factors can influence the efficient and the performance of radio communication.For instance, betiding the amount that covers interior business of local or data communication can reduce data transmission period and produce interference.Data rate also can influence the restriction that radio communication and total treating capacity can be subjected to the link layer transmission rate.Under the situation of limited transmission rate, exemplary packet (packet) size is relatively little, and needs the decoding horsepower of appropriateness.Should be used for the transmission packets time interval can be depending on messaging parameter or factor and difference.For instance, some grouping should utilize the short transmission time interval, and other groupings should utilize more the longer transmission time interval to improve radio communication.
Described based on preamble, (for example) is used for providing the technology of the duration in the short transmission time interval can help to realize the peak value treating capacity to the machine of accessing terminal with good channel condition.Almost simultaneously, can wait until in having that the user of bad channel conditions provides the longer transmission time interval.In addition, the short transmission time interval and longer transmission between the time interval flexible allocation of bandwidth resources cut apart the transmission that can be of value in the multi-user radio system.
Summary of the invention
The simplification summary that hereinafter presents one or more embodiment is to provide the basic comprehension to some aspect of described embodiment.This summary is not for the exhaustive overview of one or more embodiment and is not the scope of wishing the main or key element of the described embodiment of identification or describing described embodiment.Some notion that the sole purpose of this summary is to present in simplified form described embodiment is with as the prelude in greater detail that will present after a while.
Be characterized as a kind of method of assigning Transmission Time Interval according to one.Described method comprises the channel conditions of the grouping that measurement is communicated by letter by at least one wireless device.Also definite data rate that is associated with described at least one wireless device.Secondly, can be based in part on the channel conditions that detected and determined data rate and make decision to the described packet scheduling longer transmission time interval or the short transmission time interval.For example, if channel conditions is bad and/or have low data rate, can dispatch the longer transmission time interval so.For example, if channel conditions is good and/or data rate is high or fast, can dispatch the short transmission time interval so.For a plurality of wireless devices, can repeat described method.
Be a kind of processors to user's set that are used for assigning a plurality of Transmission Time Intervals according to another embodiment.This system comprises optimizer, and it analyzes the situation of wireless packet and the data rate of described wireless packet.Also comprise scheduler, its scheduled transmission time interval, described Transmission Time Interval was the longer transmission time interval and short transmission one in time interval to grouping.
According to another embodiment is a scheduler, and its dispatched users device is to bandwidth and Transmission Time Interval.Described scheduler can comprise the bandwidth module, and its decision is applied to the bandwidth of each user's set.Described scheduler also can comprise the Transmission Time Interval module, and it sets user's set should have the short transmission time interval or the longer transmission time interval.Described Transmission Time Interval module also can receive and analyze channel condition information and data-rate information.
According to another embodiment is a kind of system of wireless user device to different Transmission Time Intervals that be used to dispatch.Described system can comprise the device of the channel conditions that is used for definite each user's set.Also can comprise the device that is used to support at least two different cross structures in the system.Also can comprise in the system and be used for dispatching the device of Transmission Time Interval separately to each user's set.
Be a kind of computer-readable media according to still another embodiment of the invention, store the computer executable instructions that is used to detect grouped channels situation and definite throughput on it.Computer-readable media can further have and is used to be based in part on the channel conditions that detected and determined data rate and comes the instruction to grouping of dinger's Transmission Time Interval or the short transmission time interval.In another embodiment, if described instruction can comprise the bad or data rate of grouped channels situation slowly then dinger's Transmission Time Interval and/or grouped channels in order or data rate soon then dispatch the short transmission time interval.
For realizing aforementioned and relevant purpose, one or more embodiment comprise hereinafter will describe comprehensively and claims in the specific feature of pointing out.The certain illustrative aspect of one or more embodiment of the following description and drawings set forth in detail.Yet these aspects only illustrate the seldom part in the adoptable multiple mode of the principle of a plurality of embodiment, and described embodiment wishes to comprise all described aspects and its equipollent.
Description of drawings
Fig. 1 explanation is according to the wireless communication system of a plurality of embodiment that this paper presented.
Fig. 2 explanation is according to the multi-address radio communication system of one or more embodiment.
Fig. 3 explanation is used for the system of the varied transmission time intervals size of multi-user radio system forward link and reverse link.
Fig. 4 explanation utilizes the system of the varied transmission time intervals size of channel conditions and other messaging parameters.
Fig. 5 explanation is used to assign different user to arrive the flow chart of the method for different Transmission Time Intervals.
Fig. 6 explanation has six staggered short transmission time intervals.
Fig. 7 explanation has three staggered longer transmission time intervals.
Fig. 8 explanation has cutting apart flexibly of the staggered resource of mixing.
Fig. 9 illustrates the H-ARQ transmission time sequence.
Figure 10 explanation is used to expand the H-ARQ cross structure of transmitting continuous time appointment.
Figure 11 is the flow chart that is used to transmit the method for forward link data packets.
Figure 12 is the flow chart that is used to transmit the method for reverse link data packets.
Figure 13 illustrates the wireless communications environment that can combine with multiple systems as herein described and method and use.
Embodiment
Now various embodiment are described referring to accompanying drawing.In the following description, for purpose of explanation, state that multiple specific detail is to provide the thorough to one or more aspects.Yet, may be obvious that, described embodiment can put into practice there is no under the situation of these specific detail.In other cases, show that with the block diagram form well-known construction and device is to help to describe these embodiment.
As used in the present application, term " assembly ", " system " and its similar terms wish to indicate the entity relevant with computer, and it can be combination, software or the executory software of hardware, firmware, hardware and software.For instance, assembly can be handling procedure, processor, object that (but being not limited to) move, can carry out thing, execution thread, program and/or computer on processor.As an illustration, application program of moving on calculation element and described calculation element all can be assembly.One or more assemblies can reside in a handling procedure and/or the execution thread, and assembly can and/or be distributed between two or more computers on a computer.In addition, can carry out these assemblies by the multiple computer-readable media that stores plurality of data structures on it.These assemblies can be for example according to the signal with one or more packets (for example, from the data of an assembly, another assembly in described assembly and this machine system, the distributed system passes through signal interaction by signal interaction and/or via network (for example internet) and other system) communicate via this machine and/or teleprocessing program.
Now referring to graphic, Fig. 1 explanation is according to the wireless communication system 100 of a plurality of embodiment that this paper presented.System 100 can comprise one or more access points 102, its reception, transmission, repetition ... wireless communication signals arrives each other and/or arrive one or more mobile devices 104.Access point 102 can be represented the interface between a wireless system 100 and the cable network (not shown).
Each access point 102 can comprise transmitter chain and receiver chain, and wherein each can comprise with the signal transmission again and receive a plurality of assemblies (for example, processor, modulator, multiplexer, demodulator, demultiplexer, antenna etc.) that are associated.Mobile device 104 can be other appropriate device of (for example) cellular phone, smart phone, laptop computer, hand held communicator, hand held calculation element, satelline radio, global positioning system, PDA and/or communication on wireless system 100.In wireless system 100, can make existence and transmission system 100 information of knowing wireless system 100 from the cyclical transmission of the small data packets (so-called beacon) of access point 102.But described beacon of mobile device 104 sensings and the wireless connections of attempting to be established to access point 102 and/or arriving other mobile devices 104.
System 100 helps to dispatch varied transmission time intervals (TTI) and arrives one or more users that use mobile device 104 so that adapt to communication channel and network condition.System 100 can detect automatically, receives and/or infer that channel conditions, bandwidth, data rate and/or a plurality of other messaging parameters decide best still short TTI the best of long TTI for transfer of data.
The assembly that is positioned at mobile device 104 can for example install 104 decoding capability in conjunction with one or more access point 102 operations to help to monitor the ability of mobile device 104.Perhaps or in addition, access point 102 can detect this information and under the situation of a plurality of messaging parameters of considering to comprise the traffic carrying capacity in the network separately packet be dispatched to the best TTI duration.
Fig. 2 is the explanation according to the multi-address radio communication system of one or more embodiment of the present invention.Illustrated is the system 200 that can comprise the WLAN that is associated with wired local area network (LAN).Access point 102 can be communicated by letter with mobile device 104.Access point 102 is connected to Ethernet hub or the interchanger 202 of LAN.Ethernet hub 202 can be connected to one or more electronic installations 204, and it can comprise personal computer, peripheral unit (for example, facsimile machine, copying machines, printer, scanner etc.), server and its analog.Ethernet hub 202 can be connected to router two 06, and its transmission of data packets is to modulator-demodulator 208.But modulator-demodulator 208 transmission of data packets are to Wide Area Network (WAN) 210, for example internet.Single, the simple network configuration of system's 200 explanations.The many additional configuration that comprise the system 200 of alternative electronic devices are possible.Although with reference to LAN explanation and described system 200, might system 200 can be individually or utilization simultaneously comprise the other technologies of WWAN and/or WPAN.
Fig. 3 explanation is used for the various TTI size or the system of duration 300 of multi-user radio system forward link and rl transmission.System 300 comprises the access point 302 and the machine 304 that accesses terminal.Should be appreciated that, easy though system 300 can comprise an above access point 302 and/or the machine 304 that accesses terminal more than for what explain, one in each situation only is described.
Optimizer 308 can be configured to communicating by letter and/or two or more communications between the machine of accessing terminal between optimization access point 302 and the machine of accessing terminal 304.Optimizer 308 can utilize about the information of channel conditions, bandwidth, grouping size, data rate and other parameters and come optimized communication.This information can be sent to scheduler 310.Optimizer 308 can further be supported at least two different cross structures or two different types of appointments.
In general, because short TTI is the means that realize high pickup processing amount, the therefore short TTI duration can be of value to the machine that accesses terminal with good communication situation.Perhaps, long TTI can be used for being in the user of medium or bad channel conditions.In dynamically supporting two types user's system, can provide bandwidth resources cutting apart flexibly or replace cross structure between short and long TTI.
The machine 304 that accesses terminal can comprise decoder 312 and the validator 314 that is used to confirm.Signal that decoder 312 decodable codes are received and/or the packet in it are to handle.Validator 314 can adopt the affirmation technology in conjunction with the ACK/NACK agreement.In other embodiments, the machine 304 that accesses terminal can comprise that memory (not shown) and processor (not shown) handle and/or stored information to allow the machine that accesses terminal.
The machine 304 that accesses terminal can be reported its ability, and it comprises decoder size and the treatable object of just decoding.This information can be transferred to access point 302, for example when the machine of accessing terminal 304 is connected to system 300, and periodically or continuously when the machine of accessing terminal 304 is associated with system 300.Utilize this information, access point 302 can determine the machine of accessing terminal 304 for strong or a little less than the machine that accesses terminal.For instance, access point 302 can be dispatched the big bandwidth in 304 1 big channel packet of the machine of accessing terminal.If channel causes traffic congestion or changes lentamente, then it can have benefited from being used for the bigger TTI of channel estimating, because it can keep certain quantity of energy to be used for channel estimating.Shorter TTI allows the better processing time.Therefore, for dissimilar communication (for example, sound, data, image, video etc.), access point 302 can be depending on described particular channel and dispatches bigger TTI or shorter TTI with the optimization of communicating by letter.
Fig. 4 explanation utilizes the system 400 of the varied transmission time intervals size of channel conditions and other messaging parameters.System 400 comprises the access point 402 that carries out radio communication with the machine 404 that accesses terminal.Access point 402 can comprise optimizer 406 and scheduler 408.The machine 404 that accesses terminal can comprise decoder 410, and signal that its decodable code received and/or the packet in it are to handle.The machine 404 that accesses terminal also can comprise validator 412, and it can adopt the affirmation technology in conjunction with the ACK/NACK agreement.Should be appreciated that it can be the functional blocks of the function that expression implemented by processor, software or its combination (for example, firmware).
Should be appreciated that, though hereinafter with reference access point 402 discuss, in other embodiments, can carry out functional and be sent to access point 402 by the machine of accessing terminal 404.Optimizer 406 can comprise channel conditions module 414 and data rate module 416.Channel conditions module 414 can be configured to analyze channel situation.Channel conditions can comprise parameter, for example the data volume of reception/transmission etc. in the network traffic, network.Data rate module 416 can be configured to determine the data rate of current communication and/or the best data rate of specific communications.
Retransmit among the embodiment at some, scheduler 408 can add an extra bits to FLAM or RLAM, to be used to represent to be used for the cross structure of specific cluster.LAM will index to same group of hop-ports, but now be applied to one group of bigger physical frame.Scheduler 408 guarantee extraly this LAM not with may conflict mutually by issued a little earlier other LAM, especially have under the situation of different cross structures at those other LAM.
In view of example system mentioned above and that show, providing can be according to the method for one or more aspects enforcements.Though for the easy purpose of explaining, method showed and be described as sequence of operations (or mac function), but should be appreciated that and recognize, described method is not subjected to the restriction of order of operation, because some operation can be different from the order that this paper shows and describe and takes place and/or take place simultaneously with other operations according to these methods.In addition, it is necessary according to the method for one or more aspects of announcement embodiment to be not that all illustrated operations can be enforcement.Should be appreciated that, can implement a plurality of operations so that carry out be associated with described operation functional by software, hardware or its combination or any other appropriate device (for example, device, system, handling procedure, assembly).Should also be clear that some aspect that described operation only is used in simplified form this paper being described and is presented and can these aspects be described by an operation littler and/or more big figure.In addition, be not that the operation of all explanations can be that to implement following method necessary.Be understood by those skilled in the art that and recognize that method alternately is expressed as a series of state or the incidents of being mutually related in for example state diagram.
The flow chart of the method 500 that Fig. 5 explanation is used to assign different user to arrive different Transmission Time Intervals.Method 500 starts from 502 places, detects and measure the channel conditions of the grouping of being communicated by letter by at least one wireless device herein.Depend on the multiple standards that comprises the business in the wireless network, channel conditions can be bad or good.At 504 places, determine the data rate that is associated with channel.Data rate can be the factor of the amount of position to be communicated by letter or data.Described method continuation is based in part on the channel conditions that is detected at 506 places and determined data rate is made dinger's Transmission Time Interval or the short transmission time interval arrives the decision of dividing into groups.If, can dispatch the longer transmission time interval so if channel conditions is bad and/or data rate is low.If channel conditions is good and/or data rate is high, can dispatch the short transmission time interval so.Should be appreciated that, can analyze an above wireless device grouping and assign Transmission Time Interval according to method 500.For instance, can analyze a plurality of groupings and can be included in the alternative cross structure this further discussion hereinafter.
In certain embodiments, send Channel Assignment message at 508 places.Should be appreciated that Channel Assignment is optional.This Channel Assignment message can provide the information about the cross structure of wanting of specific cluster.According to some embodiment, can add an extra bits to FLAM or RLAM to represent this kind structure.For forward link transmission, can send Channel Assignment and the described Channel Assignment of transmission on forward link simultaneously before the forward link transmitted in packets or substantially.For rl transmission, can send Channel Assignment and before the reverse link transmitted in packets, on forward link, transmit described Channel Assignment.For fear of the conflict between the dissimilar appointments, for instance, whole bandwidth can be divided into two parts, and each part is used for the appointment of each type.
Fig. 6 explanation has six staggered short transmission time intervals.Specifically, illustrated is six staggered forward link and the reverse link structures that have identical traffic and retransmission delay on each interface.Multiple access system can be simultaneously communicated by letter with a plurality of terminating machines on forward link and reverse link.Forward link (or down link) refer to from the base station or access point to the communication of terminating machine.Reverse link (or up link) refers to from the terminating machine to the base station or the communication link of access point.Transmitted in packets and processing time line for single forward link/reverse link interface now will be described.
In the structure of 602 places, top of figure explanation access point, it has six staggered forward link and reverse link structures, is labeled as 1,2,3,4,5 and 6.The structure of the machine that accesses terminal is described at 604 places, bottom of figure, and it has six staggered forward link and reverse link structures, is labeled as A, B, C, D, E and F.Should be appreciated that, have two packets that have six staggered forward links and reverse link structure though the access point 602 and the machine 604 that accesses terminal all are illustrated as, can have more or less packet and/or can exist and interlock with the more or less of described structurally associated connection.
On forward link, access point 602 is in the encoded forward link grouping of 606 places transmission.This expression has the first short TTI of the duration of TTI 1 place explanation.Access terminal machine 604 decoding forward links grouping and coding and transmission reverse link confirm, for confirmationly successfully receives last forward link transmission or hybrid automatic repetitive requests (H-ARQ) retransmits.Confirm can be affirmation technology in conjunction with the ACK/NACK agreement.Expression TTI B, TTI C and TTI D 608 during decoding and the transmission that reverse link is confirmed takes place.During TTI 2, TTI 3 that represents in 610 places and the TTI 4 by access point 602 decoding forward link ACK and carry out subsequently forward link transmission or the coding that retransmits of H-ARQ.
On reverse link, the encoded reverse link grouping of transmission during the TTIA that access point 602 is represented in 612 places.614 places be labeled as 2,3 and 4 TTI during, decoding reverse link grouping and send forward link and confirm.Confirm to confirm successfully to receive last rl transmission or H-ARQ re-transmission.At 616 places, decoding forward link ACK and coding RL transmission or H-ARQ subsequently retransmits.
Should be appreciated that itself can equally repeat this process as described.Each transmission cycle can be attended by the chance of transmission one Channel Assignment message.For forward link transmission, can send Channel Assignment and the described Channel Assignment of transmission on forward link simultaneously before the forward link transmitted in packets or substantially by access point 602.For rl transmission, in the system that comprises centralized (access point) reverse link scheduler, can send Channel Assignment and before the reverse link transmitted in packets, on forward link, transmit described Channel Assignment.Especially true in some quadrature reverse link connecting system.Should be appreciated that the initial reverse link assignment of the machine that accesses terminal can be used for based in the reverse link connecting system of competing, for example DS-CDMA.
Now referring to Fig. 7, illustrated for having three staggered longer transmission time intervals and illustrated in particular three staggered forward links and reverse link structure on each interface, having identical traffic and retransmission delay.Three staggered markings of access point 702 are 1,2 and 3, and three staggered markings of the machine 704 that accesses terminal are A, B and C.In this figure, the twice of the duration that first transmission of TTI duration or forward link/reverse link grouping and its H-ARQ subsequently retransmit for the TTI duration among the Fig. 6 that is above discussed is big.
On forward link, access point 702 transmits encoded forward link grouping during a TTI at 706 places.During 708, decode forward link grouping and further encode and transmit reverse link and confirm of the machine 704 that accesses terminal.Utilize validator to transmit the successful reception of last forward link transmission or H-ARQ re-transmission.Confirm can be affirmation technology in conjunction with the ACK/NACK agreement.Utilize system's transferring ACK on two PHY frames of longer TTI as described, the instantaneous power requirement that can save ACK in this way.At 716 places, decoding forward link ACK and the execution forward link transmission subsequently or the decoding of H-ARQ re-transmission.In certain embodiments, during forward link transmission, can send Channel Assignment and the described Channel Assignment of transmission on forward link simultaneously before the forward link transmitted in packets or substantially by access point 702.
On reverse link, 712 or TTI " A " during, by the encoded reverse link grouping of the machine transmission of accessing terminal.At 714 places, grouping of decoding reverse link and transmission forward link are confirmed so that confirm the successful reception that last rl transmission or H-ARQ retransmit.During 716, decoding forward link ACK and coding RL transmission or H-ARQ subsequently retransmits.In certain embodiments, during rl transmission, can send Channel Assignment by access point 702.Having in the system of centralized reverse link scheduler before the reverse link transmitted in packets on forward link transmission (for example) assigns.Usually, this is the situation in most of quadrature reverse link connecting systems.Reverse link assignment can be used for based in the reverse link connecting system of competing, for example DS-CDMA.
Fig. 7 and Fig. 8 explanation receive the situation of forward link and rl transmission on single face as the user.In general, the machine of accessing terminal a plurality of a plurality of groupings on staggered that to be scheduled.A plurality of groupings can be corresponding to different H-ARQ processes.In addition, being assigned to the forward link of the identical machine that accesses terminal and reverse link interface need not to aim in time.
Fig. 8 explanation has cutting apart flexibly of mixing resource staggered or alternately cross structure.The time interval of the machine 804 that accesses terminal is showed in the time interval of the top displaying access point 802 of figure and the bottom of figure.The user of short TTI can be expressed as A and B, and the user of long TTI can be expressed as C, D, E and F.The length of long TTI is approximately two double-lengths of short TTI and transferring ACK on two PHY frames.Alternately cross structure can be supported the user of link budgetary constraint system.For fear of replace conflicting in cross structure and the two kinds of dissimilar appointments at this, whole bandwidth can be divided into two parts.Each part can be specifically designed to each class and assign.Should be appreciated that the described mode that avoids conflict and can utilize additive method to avoid the conflict of two classes between assigning only for example purposes.
In certain embodiments, can support to retransmit structure (can be two cross structures) to FLAM or RLAM by adding an extra bits, wherein FLAM or RLAM represent the cross structure of wanting of specific cluster.LAM indexes for same group of hop-ports, and also can be applied to one group of bigger physical frame.Scheduler can guarantee that LAM does not conflict mutually with the LAM that early sends, and especially has under the situation of different cross structures at LAM.For instance, this can realize for together using with cross structure alternately by laying in one group of channel tree nodes.
The CDM control channel can puncture to be assigned to has alternately some tone of the channel of cross structure.In six cross structures of routine, for instance, the CDM control channel punctures the whole channel of not assigning.For FDD, the transfer of data in the FLAM hint frame 0 to 5 in the frame 0.Acknowledge on the RL in frame 8 and 9 (ACK) and in frame 12 to 17 data retransmission.
Be this disclosure of complete understanding, now lack TTI and select to compare with long TTI.This relatively supposes all the fixing re-transmission time in both cases.Utilize the short TTI duration, may realize the short relatively air interface stand-by period.(for example, scheduler) target is to finish transmitted in packets so that when most of times need not the H-ARQ re-transmission, the minimizing of stand-by period was especially meaningful in a TTI when scheduler.
Utilize the short TTI duration, the work period of professional transmission is short with respect to the long TTI duration.This means each staggered required data processing (decoding, scheduling and coding) speed and compares lower with the long TTI duration.Supposing for two kinds are selected needs the identical spectrum efficiency and the H-ARQ of minimal amount to transmit decoded packet, for identical spectrum efficiency and appointment size, compare with the long TTI duration, the short TTI duration produces littler grouping size (number of information bit).
Compare with the long TTI duration, the short TTI duration can cause more interlocking of big figure.Each interlocks can be attended by corresponding forward link/The function of backward power control, for example the chance of forward link/reverse link channel assignment and forward link/reverse link ACK.Therefore, the number of forward link/The function of backward power control section is bigger for short TTI selects.In addition, the sequential of these control channels depends on staggered separately sequential, has therefore reduced the benefit of the statistical multiplexing and/or the combined coding of these control channels.In some cases, there is restriction in the granularity to the division of resources between attainable minimum control consumption and control and the business.The higher control expense of the selection of these short TI duration of factor hint.
It is professional and can be useful equally to FL (for example, OFDMA TDD) that the block dancing mode is generally used for RL in the orthogonal system (for example, OFDMA and LFDMA).Single TTI can comprise one or more (TDM) blocks continuously.In the block dancing mode, can carry out channel and Interference Estimation at each block partly based on dedicated pilot (for example, placing in this block).For the machine that accesses terminal of slow variation (walking), channel estimating performance depends on the number that the pilot tone on the frequency range that block and total pilot energy cross over is trooped.Therefore, the longer TTI duration helps to reduce pilot-frequency expense under the situation of no performance loss.Therefore, the long TTI duration causes slowly changing the better link efficiency of channel.What deserves to be mentioned is when selecting long TTI during the duration, for fast-changing channel, do not have basic link performance loss.
The high data rate machine of accessing terminal with good channel condition tends to receive big Channel Assignment (with regard to each staggered number of tones), so that utilize spectral efficient and can realize high data rate.For have the very machine that accesses terminal of two-forty at the link layer place, total treating capacity can be subjected to the restriction of air interface turnaround time.Therefore, the interface stand-by period is important in the low latitude, and it need be lacked the TTI duration, assign size and spectral efficient to reduce the load of picking up of TX/RX data processing (for example, decoding) greatly.Low relatively control expense (because appointment and ACK expense are not in proportion with appointment) is represented in the big appointment of each machine that accesses terminal.At last, the accuracy of channel estimation that high s/n ratio (SNR) is located is improved, and the link performance of therefore short TTI duration loses really not so key.Generally speaking, lack high data rate that TTI selects to be suitable for the to be in good channel condition machine that accesses terminal.
For have low data rate and in wait until the machine that accesses terminal of bad channel conditions, total treating capacity can be subjected to the restriction of link layer transmission rate, does not therefore use strict stand-by period requirement.Because limited transmission rate, the exemplary packet size is relatively little, thereby causes the appropriate requirement to decoding horsepower.Therefore, a little sudden processing of tolerable.Generally speaking, it is not extremely important for the machine that accesses terminal of medium channel quality to lack the key benefits of TTI duration.Yet, suppose that each staggered link budget reduced with the TTI duration, for the machine that accesses terminal that is in bad channel conditions, the short TTI duration can cause very little grouping size.Therefore the physical loss that little grouping size (about 100 and littler) causes coding gain further damages the machine that accesses terminal that is in bad channel conditions.With regard to link efficiency, it is of value to the FDM user who is in bad channel conditions.Therefore, a plurality of users can dispatch on same interlocking, and increase each staggered control expense by this.In this case, the number (relevant with the increase of TTI duration) that reduces to interlock helps to reduce expense.At last, the machine of accessing terminal that is in bad channel conditions can have benefited from the increase of the link layer performance that occurs with the long TTI duration.
Fig. 9 illustrates the H-ARQ transmission time sequence.Forward link and reverse link data transmission are all supported H-ARQ.In processing time in order to locate at access point (AP) and the machine of accessing terminal (AT) to provide relevant, six cross structures can be used for forward link and reverse link with H-ARQ.Should be appreciated that, can utilize more or still less frame and six cross structures only for purpose for example.Show the transmission time sequences that are associated in forward link staggered with six at 902 places, and the situation of showing reverse link at 904 places.Other staggered sequential are identical, the PHY frame of similar number but all transmission all are shifted.This cross structure is ignored the existence of superframe preface, for example, as the superframe preface be not present on the forward link and on reverse link, do not prolong as a PHY frame as PHY frame layer transmission time sequence takes place.
For forward link, the appointment that arrives forward link PHY frame k is applied to and contains the staggered of forward link PHY frame k, and in the forward link transmission of confirming on the reverse link PHY frame k+3 on the forward link PHY frame k.The H-ARQ that is associated with transmission in starting from PHY frame k retransmits and betides among the PHY frame k+6n, and wherein n is for retransmitting index, n=0, and 1 ....This frame structure provides the H-ARQ of about 5.5ms to retransmit the stand-by period and in processing time of the 1.8ms at AT and AP place (2 PHY frames).
For reverse link, the appointment that arrives forward link PHY frame k is applied to and contains the staggered of reverse link PHY frame k+2, and in the rl transmission of confirming on the forward link PHY frame k+2 on the reverse link PHY frame k.The HARQ that is associated with transmission in starting from PHY frame k retransmits and betides among the PHY frame k+6n, and wherein n is for retransmitting index, n=0, and 1 ....
This frame structure provides the processing time of the 2.7ms (3 PHY frames) at the processing time of the 0.9ms (1 PHY frame) that the H-ARQ of 5.5ms retransmits stand-by period and AT place and AP place.The processing time that reduces at the AT place is suitable for reverse link, separates mediation data packet coding/modulation because AT only needs to carry out to assign, and anticipates promptly than packet rectification simple task more.
Now referring to Figure 10, illustrated is the H-ARQ cross structure that is used to expand transmitting continuous time appointment.Should be appreciated that example disclosed herein only is example and can exists than the more or less frame of those frames of showing and describing in the drawings.Except that H-ARQ cross structure mentioned above, provide the transmitting continuous time of expansion to assign.Described appointment can be expanded transmission and can change transmission time sequence and corresponding A CK transmission with respect to appointment illustrated among all figure above on a plurality of PHY frames.Expand transmitting continuous time and assign applicable to the user who is subjected to link budget constraint, described user can have benefited from the coding transmission of longer transmission on the duration more.Expand transmitting continuous time appointment and can cause resource assignment and standard to assign afoul potential possibility, and access node (AN) answers management resource to assign to prevent described conflict.
For the forward link of 1002 places on figure top explanation, the transmitting continuous time of expansion that arrives forward link PHY frame k assigns and be applied to contain the staggered of forward link PHY frame k to k+5.In the forward link transmission of confirming on the reverse link PHY frame k+8 to k+9 on the forward link PHY frame k to k+5.The HARQ that is associated with the transmission that starts from PHY frame k retransmits and starts from PHY frame k+12n, and wherein n is the re-transmission index, n=0, and 1 ....Frame structure 1002 provides the H-ARQ of 11ms to retransmit the stand-by period and in the processing time of the machine of accessing terminal (AT) with the 1.8ms (2 PHY frames) at access node place.
Now referring to the reverse link of 1004 places of figure bottom explanation, the transmitting continuous time of expansion that arrives forward link PHY frame k assigns and is applied to contain the staggered of reverse link PHY frame k+3 to k+9.In the rl transmission of confirming on the reverse link PHY frame k+12 on the reverse link PHY frame k+3 to k+9.The HARQ that is associated with the transmission that starts from PHY frame k retransmits and starts from PHY frame k+12n, and wherein n is the re-transmission index, n=0, and 1 ....This frame structure 1004 provides the H-ARQ of 11ms to retransmit the stand-by period and the processing time of the 2.7ms (3 PHY frames) at the processing time of the 1.8ms (2 PHY frames) at the machine place that accesses terminal and access node place.
Figure 11 is the flow chart of the method 1100 of transmission forward link data packets.Described method starts from 1102, is divided into groups by access point coding forward link at this.Described encoded grouping is transferred to the machine of accessing terminal subsequently.The machine that accesses terminal receives the described forward link grouping and the described grouping of decoding at 1104 places.If successfully decode described grouping, the so described machine coding reverse link that accesses terminal confirms that (ACK) confirms the successful reception of described forward link transmission (or hybrid automatic repetitive requests (H-ARQ) retransmits).Be transferred to access point at 1106 ACK of place.Receive reverse link ACK and access point decoding forward link ACK at 1108 places by access point.At 1110 places, access point next forward link transmission (or H-ARQ retransmit) of encoding subsequently.
In other embodiments, each transmission cycle can be attended by the chance of transmission one Channel Assignment message.For forward link transmission, send Channel Assignment at 1112 places and (or substantially simultaneously) described Channel Assignment of transmission on forward link before the forward link transmitted in packets.It should be noted that with dash lines show block 1112 to represent that it serves as optional.
Figure 12 is the flow chart of the method 1200 of transmission reverse link data packets.Described method starts from 1202, in this coding reverse link grouping.Can carry out this coding by access point.Described encoded grouping further is transferred to the destination that can be the machine of accessing terminal.Described encoded reverse link grouping receives and decodes at 1204 places.If successfully receive and decoded packet (last rl transmission or H-ARQ retransmit), confirm (ACK) at 1206 places coding and transmission forward link so.For example can carry out coding and the transmission that forward link is confirmed by the machine that accesses terminal.At 1208 places, (for example) receives forward link and confirms at the access point place.At 1210 places, next rl transmission of encoding (or H-ARQ retransmits).
In other embodiments, transmission cycle should be attended by the chance of transmission one Channel Assignment message.In these embodiments, before the encoded reverse link grouping of 1202 places transmission, send Channel Assignment at 1212 places.Can on forward link, transmit this Channel Assignment.Channel Assignment is useful in the system with centralized (access point) reverse link scheduling with being transmitted in.Particularly useful in quadrature reverse link connecting system.It should be noted that the initial reverse link assignment of the machine of accessing terminal can be used for the reverse link connecting system based on competition, for example direct sequence CDMA (DS-CDMA).
Should be appreciated that Figure 11 and Figure 12 show and description with reference to the user receives forward link and rl transmission on single interlocking situation.In general, each machine of accessing terminal a plurality of a plurality of groupings (corresponding to different H-ARQ processes) on staggered that to be scheduled.In addition, forward link and the reverse link interlace that is assigned to the identical machine that accesses terminal need not to aim in time.
Figure 13 illustrates example wireless communication system 1300.For the purpose of concise and to the point, wireless communication system 1300 is described a base station and a terminating machine.Yet, should be appreciated that system 1300 can comprise an above base station or access point and/or above terminating machine or user's set, wherein additional base stations and/or terminating machine can be identical or different substantially with hereinafter described exemplary base station and terminating machine.In addition, should be appreciated that base station and/or terminating machine can adopt system as herein described and/or method to help radio communication therebetween.
Now, on down link,, transmit (TX) data processor 1310 and receive, format, encode, interlock and modulate (or sign map) business datum and modulation symbol (" data symbol ") is provided at access point 1305 places referring to Figure 13.Symbol modulator 1315 receives and deal with data symbol and frequency pilot sign and symbols streams is provided.Symbol modulator 1315 multiplexed datas and frequency pilot sign and obtain one group of N transmission symbol.Each transmission symbol can be data symbol, frequency pilot sign or signal value of zero.Can in each symbol period, send described frequency pilot sign continuously.But frequency division multiplex (FDM), Orthodoxy Frequency Division Multiplex (OFDM), time division multiplexing (TDM) or the described frequency pilot sign of code division multiplex (CDM).
Transmitter unit (TMTR) 1320 receives and conversion symbol stream is one or more analog signals, and further adjusts the down link signal that (for example, amplification, filtering and increase conversion frequently) described analog signal is suitable for transmitting on wireless channel with generation.Transmit described down link signal to terminating machine via antenna 1325 subsequently.At terminating machine 1330 places, antenna 1335 receives described down link signal and provides the signal that is received to acceptor unit (RCVR) 1340.The signal that signal that acceptor unit 1340 adjustment (for example, amplification, filtering and down conversion) are received and digitlization are adjusted is to obtain sample.Symbol demodulator 1345 obtain N received signals and provide the frequency pilot sign that received to processor 1350 to carry out channel estimating.Symbol demodulator 1345 further receives the frequency response that is used for down link from processor 1350 and estimates, the data symbol that received is carried out data demodulates estimate (estimation that it is the data symbol that transmitted) to obtain data symbol, and provide data symbol to estimate RX data processor 1355, its demodulation (for example, symbol goes mapping), deinterleave and decoded data sign estimation are to restore the business datum of being transmitted.Complementary mutually with the processing that the Symbol modulator 1315 and the TX data processor 1310 at access point 1305 places carry out respectively by the processing that symbol demodulator 1345 and RX data processor 1355 carry out.
On up link, TX data processor 1360 processing service data also provide data symbol.Symbol modulator 1365 receives also multiplexed data and frequency pilot sign, execution modulation and symbols streams is provided.Subsequently, transmitter unit 1370 receives and handles described symbols streams to produce the uplink signal that is transferred to access point 1305 by antenna 1335.
At access point 1305 places, handle described uplink signal to obtain sample from the uplink signal and the acceptor unit 1375 of terminating machine 1330 by antenna 1325 receptions.Symbol demodulator 1380 is handled sample and is provided frequency pilot sign that is received and the data symbol that is used for up link to estimate subsequently.RX data processor 1385 deal with data sign estimation are to restore the business datum by terminating machine 1330 transmission.The active terminating machine of 1390 pairs of each that transmit on up link of processor is carried out channel estimating.
Processor 1390 and 1350 instructs the running at (for example, control, coordination, management etc.) access point 1305 and terminating machine 1330 places respectively.Processor 1390 separately and 1350 can be associated with store program codes and memory of data unit (not shown).Processor 1390 and 1350 also can be carried out calculating respectively and estimate with frequency and impulse response that derivation is used for up link and down link.
For multi-address system (for example, FDMA, OFDMA, CDMA, TDMA etc.), a plurality of terminating machines can transmit on up link simultaneously.For this kind system, can be between the different terminals machine common pilot time frequency band.Can under crossing over the situation of whole running frequency band (may except that band edge), the pilot tone of each terminating machine time frequency band adopt channel estimation technique.This pilot tone time band structure may be that the frequency diversity of each terminating machine of acquisition is needed.Can implement the techniques described herein by several different methods.For instance, these technology can hardware, software or its combination implement.Implement for hardware, the processing unit that is used for channel estimating may be implemented in one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, other are through electronic unit or its combination of design to carry out function described herein.Under the situation of software, embodiment can realize via the module (for example, program, function etc.) of carrying out function as herein described.Software code can be stored in the memory cell and by processor 1390 and 1350 and carry out.
Should be appreciated that embodiment as herein described can be implemented by hardware, software, firmware, middleware, microprogram sign indicating number or its any combination.When system and/or method were implemented with software, firmware, middleware or microprogram sign indicating number, procedure code or sign indicating number section, it can be stored in the machine-readable medium, for example memory module.The sign indicating number section can be represented any combination, data structure or the program statement of process, function, subprogram, program, routine, inferior routine, module, software kit, class or instruction.The sign indicating number section can be coupled to another yard section by transmission and/or reception information, data, independent variable, parameter or memory content.Information, independent variable, parameter, data etc. can be used any proper method transmission, forwarding or the transmission that comprises Memory Sharing, message transmission, token transmission, Network Transmission etc.
For software implementation, can use the module (for example program, function etc.) of carrying out function as herein described to implement the techniques described herein.Software code can be stored in the memory cell and by processor and carry out.Memory cell may be implemented in processor inside or processor outside, and in the case, it can be coupled to processor with communication mode via several different methods known in this technology.
Foregoing comprises the example of one or more embodiment.Certainly, and can not assembly or method be described for the purpose of describing previous embodiment each may make up, but those skilled in the art will appreciate that generally many further combination and the change of a plurality of embodiment are possible.Therefore, the foregoing description wishes to contain all described changes, the modifications and variations in the spirit and scope that belong to the claims of enclosing.In addition, " comprise " that described term " comprises " wishes to be interpreted as inclusive to be similar to the mode understood when term " comprises " as the language of the transition in the claim with regard to the term that is used for execution mode and claims.
Claims (22)
1. method of assigning Transmission Time Interval, it comprises:
Measurement is by the channel conditions of the grouping of at least one wireless device transmission;
Definite data rate that is associated with described at least one wireless device; And
Be based in part on described after testing channel conditions and describedly decide to the described packet scheduling longer transmission time interval or the short transmission time interval through determined data rate.
2. method according to claim 1, it further comprises:
If described channel conditions is bad and have low data rate, dinger's Transmission Time Interval so.
3. method according to claim 1, it further comprises:
If the good and described data rate height of described channel conditions is dispatched the short transmission time interval so.
4. method according to claim 1, it further comprises:
Be emitted in Channel Assignment message waiting for transmission on forward link and the reverse link.
5. method according to claim 1, it further comprises:
Detect the channel conditions of at least one second wireless device;
Definite data rate that is associated with described at least one second wireless device;
Be based in part on described at least one second wireless device described after testing channel conditions and describedly decide to the described at least one second wireless device dinger Transmission Time Interval or the short transmission time interval through determined data rate; And
Transmit the described Transmission Time Interval of described first wireless device substantially simultaneously with the described Transmission Time Interval of described second wireless device.
6. method according to claim 1, it further comprises:
Add an extra bits to indicate the cross structure of described grouping to FLAM or RLAM.
7. processor, its execution are used for assigning to user's set one instruction of a plurality of Transmission Time Intervals, and it comprises:
Optimizer, it analyzes the situation of wireless packet and the data rate of described wireless packet; And
Scheduler, it is to the packet scheduling Transmission Time Interval, and described Transmission Time Interval is the longer transmission time interval and short transmission one in time interval.
8. processor according to claim 7, if described by analysis the bad or described data rate of situation is low, the so described scheduler schedules longer transmission time interval.
9. processor according to claim 7, if described by analysis in order or described data rate height, the so described scheduler schedules short transmission time interval.
10. processor according to claim 7, the further transfer channel assignment messages of described scheduler is to indicate the cross structure of described wireless packet.
11. processor according to claim 10, described Channel Assignment are before the forward link transmitted in packets or meanwhile transmit on forward link substantially.
12. processor according to claim 10, described Channel Assignment transmitted on forward link before the reverse link transmitted in packets.
13. a scheduler, it is to user's set scheduling bandwidth and Transmission Time Interval, and it comprises:
The bandwidth module, its decision is applied to the bandwidth of each user's set; And
The Transmission Time Interval module, it sets described user's set should have the short transmission time interval or the longer transmission time interval.
14. scheduler according to claim 13, further receive channel condition information of described Transmission Time Interval module and data-rate information.
15. scheduler according to claim 14 if the good and described data rate of described channel conditions is fast, is dispatched the short transmission time interval so.
16. scheduler according to claim 14, if the medium and described data rate of described channel conditions is slow, dinger's Transmission Time Interval so.
17. an equipment that is used for dispatching to wireless user device different Transmission Time Intervals, it comprises:
The device that is used for the channel conditions of definite each user's set;
Be used to support the device of at least two different cross structures; And
Be used for dispatching the device of Transmission Time Interval separately to each user's set.
18. equipment according to claim 17, it further comprises:
Be used for transmitting the device of described Transmission Time Interval separately with radio communication.
19. equipment according to claim 17 is based in part on described channel conditions and described data rate, gives the described user's set scheduling short transmission time interval or the longer transmission time interval.
20. a computer-readable media, store on it computer executable instructions with:
Detect the grouped channels situation;
Determine throughput; And
Be based in part on described after testing channel conditions and described, the dinger's Transmission Time Interval or the short transmission time interval through determined data rate.
21. computer-readable media according to claim 20, its further comprise with give an order with:
If the bad or described data rate of described grouped channels is slow, so dinger's Transmission Time Interval.
22. computer-readable media according to claim 20, its further comprise with give an order with:
If the good or described data rate of described packet conditions is fast, dispatch the short transmission time interval so.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110412371.7A CN102523082B (en) | 2005-08-24 | 2006-08-24 | For the method and apparatus of the varied transmission time intervals of wireless communication system |
| CN201510752310.3A CN105337698B (en) | 2005-08-24 | 2006-08-24 | Multiple transmission time intervals for wireless communication systems |
| CN201110412374.0A CN102523083B (en) | 2005-08-24 | 2006-08-24 | For the varied transmission time intervals of wireless communication system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US71114505P | 2005-08-24 | 2005-08-24 | |
| US60/711,145 | 2005-08-24 | ||
| US11/260,932 | 2005-10-27 |
Related Child Applications (5)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100260791A Division CN102082650A (en) | 2005-08-24 | 2006-08-24 | Varied transmission time intervals for wireless communication system |
| CN201110026555XA Division CN102065561A (en) | 2005-08-24 | 2006-08-24 | Varied transmission time intervals for wireless communication system |
| CN201510752310.3A Division CN105337698B (en) | 2005-08-24 | 2006-08-24 | Multiple transmission time intervals for wireless communication systems |
| CN201110412371.7A Division CN102523082B (en) | 2005-08-24 | 2006-08-24 | For the method and apparatus of the varied transmission time intervals of wireless communication system |
| CN201110412374.0A Division CN102523083B (en) | 2005-08-24 | 2006-08-24 | For the varied transmission time intervals of wireless communication system |
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| CN101292456A true CN101292456A (en) | 2008-10-22 |
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| CNA2006800391579A Pending CN101292456A (en) | 2005-08-24 | 2006-08-24 | Varied transmission time intervals for wireless communication system |
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