CN104135352A - Communication system and method using dynamic time division duplex configuration mechanism - Google Patents
Communication system and method using dynamic time division duplex configuration mechanism Download PDFInfo
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Abstract
The invention relates to a communication system and method using a dynamic time division duplex (TDD) configuration mechanism. The present disclosure proposes implementing the dynamic TDD mechanism by imposing a restriction to dynamic TDD configurations to adhere to a set of allowable dynamic TDD configurations. The uplink and downlink HARQ timing reference configurations could be derived from the set of allowable dynamic TDD configurations. The set of allowable TDD configurations, the uplink HARQ timing reference configuration and the downlink HARQ timing reference configuration could be derived based on specific rules. The maximum number of downlink HARQ processes for TDD would follow the downlink HARQ timing reference configuration.
Description
Technical field
The present invention be directed to communication system and the method for using dynamic time division duplex (dynamic time division duplex, TDD) configuration mechanism.
Background technology
The theme of " for the further enhancing (Further Enhancements to LTE Time Division Duplex (TDD) for Downlink-Uplink (DL-UL) Interference Management and Traffic Adaptation) of the LTE time division duplex (TDD) of down link-up link (DL-UL) interference management and adaptive-flow " has been agreed the job as the research project of 3GPP the 11st edition and 3GPP the 12nd edition.3GPP RAN1 and RAN4 work group have carried out the Performance Evaluation to various deployment scenario.Show, can in Long Term Evolution (LTE) time division duplex (TDD) system, dynamically reconfigure and improve to a great extent average cell throughout by permission.
TDD scheme is disposed providing in the situation that not needing a plurality of frequency spectrum resource flexibly.Current, LTETDD will distribute by providing down link-up link (DL-UL) configuration (as shown in table 1 below) of seven kinds of different semi-static configurations to realize asymmetric D L-UL, and these distribution can provide 40% to 90% DL subframe.
Table 1
More particularly, the DL-UL of these seven kinds of different semi-static configurations is configured in the left column of table 1 and carries out index and be numbered 0 to 6.In the present invention, DL-UL configuration is also called TDD configuration or TDD DL-UL configuration.For each TDD configuration, the subframe of radio frame will be configured to downlink subframe, uplink sub-frames or special subframe, and the top line of table 1 is shown the index of subframe numbering.Therefore,, in order to be down link and the uplink time slot with given number by radio frame configurations, enode b (eNB) will send in described UL-DL configuration in system information (SI).
For instance, if network has experienced heavy downlink traffic, eNB can determine TDD configuration 5 so, and described TDD configuration 5 will be sent to UE (subscriber equipment) and provide 8 downlink time slots and 1 uplink time slot by each radio frame.Yet, if heavy downlink traffic flip-flop is heavy uplink traffic, eNB may not can change TDD configuration immediately so, but must pass on described variation by revising system information, and can only occur revising boundary for the modification of the system information of traditional UE.This will mean, it will be semi-static but not dynamic via SI, changing to reconfigure TDD configuration, and may not mate instantaneous delivery situation.
Compare with changing system information program, the known technology that dynamically reconfigures is carried out TDD by the cycle that needs much shorter and is reconfigured.Assessment in corresponding research project reconfigures to present significant performance benefits by realize TDD DL-UL based on adaptive-flow in small cell, as " for the further enhancing (Further enhancements to LTE Time Division Duplex (TDD) for Downlink-Uplink (DL-UL) interference management and traffic adaptation) of the LTE time division duplex (TDD) of down link-up link (DL-UL) interference management and adaptive-flow " (3GPP TR38.828, V11.0.0, in June, 2012) mentioned, described document is incorporated herein by reference for the object of definition.And, showing, dynamic signaling mechanism will surpass the mechanism of using changing system information program.
Also for the object defining, can be according to " physical channel and modulation (Physical Channels and Modulation) " (3GPP TS36.211, V11.0.0, in September, 2012), " physical layer procedures (Physical Layer Procedures) " (3GPP TS.213, V11.0.0, in September, 2012) and " medium access control (MAC) protocol specification) (Medium Access Control (MAC) protocol specification) " (3GPP TS36.321) carry out definition of T DD frame structure, DL-UL configuration and UL-HARQ sequential relationship, described document is all incorporated herein by reference for the object of definition.
Yet, to TDD DL-UL, configuration has different understanding by causing the novel UE that does not dynamically reconfigure traditional UE of ability and have this ability with dynamic technique, to reconfigure TDD configuration, because traditional UE must follow changing system information program, and novel UE can reconfigure TDD DL-UL configuration via control the dynamic signaling mechanism such as (RRC) signaling such as physical layer signaling, medium access control (MAC) signaling or radio resource.This can cause various problems potentially, comprises the problem by UE measures and mixed automatic repeat request (HARQ) operation causes.
HARQ is called as widely used transmission technology in modern wireless communication systems.HARQ operated originally by resend identical duplicate or another redundancy version of original transmitted when there is error of transmission.Receiver then combines previous impaired transmission and the transmission resending.In LTE TDD system, because the difference of DL-UL subframe is distributed and comes individually and the feedback information of differently definition indication error of transmission and corresponding sequential relationship between again transmitting for each in described 7 kinds of configurations.Yet TDD configuration flip-flop can cause traditional UE and have the HARQ operation interference between the novel UE that dynamically reconfigures ability.
And, dynamically reconfiguring not only throwing into question between the novel UE that dynamically reconfigures ability and may cause interference between novel UE with having at traditional UE of TDD configuration, may depend on that because novel UE the TDD dynamically selecting configures and has different HARQ with reference to sequential for up link and both downlink.In addition, TDD configuration dynamically reconfigures and will also in the soft buffer management process of novel UE, throw into question.
More particularly, with dynamic technique, reconfigure TDD configuration and will when UE experiences HARQ process, affect the soft buffer management of described UE.Software buffer management during DL HARQ process can be described as briefly: for each subframe that wherein downlink transmission occurs between UE and base station, UE is received in payload from the transmission block of base station and is associated in DL HARQ information.UE will follow based on downlink transmission be new transmission or old transmission and according to log-likelihood ratio (Log-Likelihood Ratio, LLR) information, described payload is stored in buffer or with the payload combination being previously stored in buffer.UE will then respond with ACK or NACK based on being stored in the decoded result of the payload that receives in buffer.About setting relevant detailed discussion with soft buffer, please refer to quoted passage provided above.And UL HARQ will work in a similar manner.
Yet, the unsteadiness of the soft buffer that the dynamic change of TDD configuration causes the flip-flop that causes potentially being configured by TDD.Maximum number (the M of the DL-HARQ process for TDD in the typical LTE communication system of table 2 explanation
dL-HARQ).
| TDD UL/DL configuration | The maximum number of HARQ process |
| 0 | 4 |
| 1 | 7 |
| 2 | 10 |
| 3 | 9 |
| 4 | 12 |
| 5 | 15 |
| 6 | 6 |
Table 2
The in the situation that of Frequency Division Duplexing (FDD) (FDD) system, current 8 of the every Serving cells that are defined as of the maximum of downlink HARQ process.The in the situation that of TDD system, can find out, the maximum number of every community HARQ process is not constant, and will change according to the current TDD UL/DL configuration set in the SI of serving BS.The in the situation that of down link, the maximum number of DL-HARQ process will affect UE and configure the mode that soft buffer (soft buffer) is set.This means that soft buffer is set will also be needed dynamically to reconfigure when TDD configuration is dynamically changed.Therefore, soft buffer is set in UE the unexpected change before reacting if having time will be caused being previously stored in the loss of the data in soft buffer.
In addition, support that the pith of downlink channel dependence scheduling is channel status reporting.Channel status reporting offers eNB by UE, and eNB can make scheduling decision based on described channel status reporting.The channel status reporting of one type is non-periodic channel state report.At network, when being included in the channel status request flag of uplink scheduling in authorizing and clearly asking, send aperiodicity channel status reporting.Use dynamic technique to reconfigure TDD configuration and will in aperiodicity channel status reporting, cause sequential logic mismatch.
Traditional UE (before the 12nd edition) is according to challenge referred to above and to reconfigure technology incompatible with dynamic TDD DL-UL, may need new design to avoid the potentially conflicting between traditional UE and novel UE (the 12nd edition and thereafter version).And new design is by the potentially conflicting that need to solve between novel UE owing to the mispairing of HARQ sequential and the problem relevant with soft buffer management.
Summary of the invention
Therefore, the present invention be directed to the communication system of using dynamic time division duplex (TDD) configuration mechanism.
According to one exemplary embodiment, the present invention discloses a kind of communication system, and it comprises at least the reflector of (but being not limited to) transmission data, the receiver of reception data, and the processor that is coupled to described reflector and described receiver.Described processor will be configured for use in: from predetermined TDD configuration set, select current time division duplex (time division duplex, TDD) configuration; Send described current TDD configuration via described reflector after, based on described current TDD configuration, select dynamic TDD configuration; From described predetermined TDD configuration set, determine that down link mixes request (downlink hybrid automatic request automatically, DL-HARQ) timing reference configuration, the downlink subframe of wherein said DL-HARQ timing reference configuration is the superset of each TDD configuration of the permission set of dynamic TDD configuration, and each downlink subframe that wherein dynamically the described permission set of TDD configuration comprises described current TDD configuration may not configure by TDD by one or more that are selected from that the described dynamic TDD configuration of described permission set do not reconfigure to uplink sub-frames; And implement HARQ process by following the reference sequential of described DL-HARQ timing reference configuration.
According to one in one exemplary embodiment, the present invention discloses a kind of communication system, and it comprises: for receive the module of current time division duplex (TDD) configuration from predetermined TDD configuration set, for receive the module of dynamic TDD configuration based on described current TDD configuration receive described current TDD configuration via described receiver after, for determining that from described predetermined TDD configuration set down link mixes request (downlink hybrid automatic request automatically, DL-HARQ) module of timing reference configuration, the downlink subframe of wherein said DL-HARQ timing reference configuration is the superset that each TDD of the permission set of dynamic TDD configuration configures, each downlink subframe that wherein dynamically the described permission set of TDD configuration comprises described current TDD configuration may not configure by TDD by one or more that are selected from that the described dynamic TDD configuration of described permission set do not reconfigure to uplink sub-frames, and for implement the module of HARQ process by following the reference sequential of described DL-HARQ timing reference configuration.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing to be described in detail below.
Accompanying drawing explanation
The schematic diagram of line when Fig. 1 is the UL HARQ for seven kinds of TDD configurations in explanation LTE communication system.
Fig. 2 A is that explanation is according to the flow chart of the technology in order to definite dynamic TDD configuration set of permission corresponding to each current TDD configuration of one exemplary embodiment of the present invention.
Fig. 2 B is that the flow chart of the technology of the dynamic TDD configuration set of permission configuring corresponding to each current TDD is determined in explanation according to the another kind of one exemplary embodiment of the present invention.
Fig. 2 C is the flow chart that may combine that the technology of Fig. 2 A and Fig. 2 B is used in explanation.
Fig. 3 explanation is according to definite UL HARQ timing reference configuration, the configuration of DL HARQ timing reference and the M of one exemplary embodiment of the present invention
dL_HARQthe program of parameter.
Fig. 4 explanation is according to the disclosed dynamic TDD configuration mechanism of the angle from base station of one exemplary embodiment of the present invention.
Fig. 5 is that explanation is according to the disclosed dynamic TDD configuration mechanism of the angle from UE of one exemplary embodiment of the present invention.
Embodiment
With detailed reference to one exemplary embodiment of the present invention, the example is illustrated in the accompanying drawings.All may part, same reference numbers at accompanying drawing with in describing in order to refer to same or similar part.
Current, TDD LTE is by providing seven kinds of different semi-static configurations to realize the asymmetric D L-UL sub-frame allocation of radio frame.In 3GPP the 12nd edition, introduce dynamic TDD configuration (eIMTA), so that base station can dynamically configure or reconfigure TDD configuration based on traffic conditions.The present invention relates to have dynamic TDD DL-UL and reconfigure functional single carrier LTE TDD system.In this type systematic, with dynamic technique, configuring or reconfigure TDD configuration will throw into question dynamically not reconfiguring traditional UE of ability and have between the novel UE that dynamically reconfigures ability, because traditional UE will have the understanding different from novel UE to current TDD DL-UL configuration, this is because legacy system is not supported dynamically to reconfigure functional.Thereby, will there is various problems, be apparent that most to UE measurement and HARQ and operate relevant problem.When using dynamic TDD configuration mechanism, traditional UE (the 11st edition or its before version) will face various problems.
Problem can to have incorrect DL signaling quality measurements relevant to traditional UE in the situation that some DL subframes dynamically being changed into UL subframe.If some DL subframe is dynamically changed into UL subframe, measurement result will be likely incorrect so.More particularly, downlink reference signal will be followed down link conventionally, and uplink reference signals will be followed up link conventionally.Current LTE standard is also pointed out, needs traditional UE executive signal mass measurement in all DL subframes.Therefore, when downlink subframe dynamically being switched to uplink sub-frames, the traditional UE that lacks the ability that dynamically reconfigures TDD sub-frame configuration may, still carrying out downlink signal quality measurement, just be used for up link and the set reference signal that reconfigures the novel UE of ability for having dynamic TDD.By using incorrect reference signal, traditional UE will probably obtain incorrect signal quality measured.
Another problem is by the UL HARQ transmission to traditional UE and transmission is relevant again, in the situation that the subframe of transmit/transmission again has been dynamically altered the subframe for DL, described transmission and again transmission can be disturbed novel UE.Problems can have a strong impact on systematic function and the dispatching flexibility having in the TDD system that dynamic DL-UL reconfigures.In other words, if UL HARQ occurs in the subframe that is changed to DL subframe, UL HARQ will disturb novel UE so.
Another problem is relevant by the Sudden failure of setting with soft buffer as previously mentioned.As previously mentioned, when TDD UL/DL configuration dynamically reconfigures, soft buffer is set the information providing based on table 2 and is correspondingly changed.When soft buffer is set change suddenly, the UE that supports dynamic TDD to reconfigure ability may have no time to make necessary adjustment, and therefore may for good and all lose the data that are stored in soft buffer.
Another problem is by relevant with the sequential logic mismatch of novel UE in aperiodicity CSI report.Because the sequential of aperiodicity CSI report depends on TDD configuration, therefore novel UE will report CSI in the subframe changing to down link.
Dynamically reconfiguring and meaning herein, by being used fast signalling mechanism such as physical layer signaling, MAC layer signaling or RRC signaling to implement to reconfigure; And rely on for reconfiguring of traditional UE, use conventional SIB transmission, it passes on new reconfiguring after the modification cycle.This will imply, when novel UE is dynamically configured to new TDD configuration, traditional UE can still implement the TDD configuration of acquiescence for the current SI modification cycle, until change described TDD configuration in the next SI modification cycle.
In view of foregoing problems, the TDD that obviously can not dynamically reconfigure novel UE by fast signalling in unrestricted mode configures, so the present invention discloses a kind of dynamic TDD configuration mechanism, it configures/reconfigures mechanism to dynamic TDD and forces some rule or constraint.Therefore, the present invention will provide UE and the base station with dynamic TDD signaling mechanism, described dynamic TDD signaling mechanism is the suitably dynamically TDD UL-DL configuration for novel UE by the current TDD DL-UL configuration setting based on for traditional UE, by the HARQ sequential that is associated of setting for novel UE, and set setting for the soft buffer of being associated of novel UE.To Fig. 5, table 3, table 4 and the corresponding declarative description to these accompanying drawings to be supplied, illustrate concrete concept of the present invention and embodiment by Fig. 1.
The schematic diagram of line when Fig. 1 is the UL HARQ for seven kinds of TDD configurations in explanation LTE communication system, and Fig. 1 will be in order to illustrate inventive concepts of the present invention.In the TDD system for LTE, will implement HARQ to be different from the mode of FDD system, the ACK/NACK message in response to the transmission in subframe in FDD system will occur with relatively-stationary interval.Yet, for TDD system, in response to the ACK/NACK message of the transmission in subframe, will with fixed intervals, not occur, this is owing to having uplink sub-frames and the downlink subframe of variable number for different TDD configurations.In general, when carrying out receiving downlink data by downlink subframe, will send ACK/NACK with the next uplink sub-frames that leaves at least four subframes, vice versa.The delay of four subframes is that the processing delay due to receiving terminal causes.
For instance, for simplicity, adopt configuration 4, while sending the first up link content in the subframe numbering 2 of UE in frame N, same UE receives corresponding ACK/NACK by numbering 8 places in the subframe of frame N.Similarly, while sending the second up link content in the subframe numbering 3 in frame N, by numbering 9 places in the subframe of frame N, receive corresponding ACK/NACK.When UE is when subframe is numbered 8 places' reception ACK/NACK signaling, UE will number in the subframe of frame N+1 2 places and send corresponding transmission again, by that analogy.
In view of Fig. 1, will understand basis of the present invention from following reasoning.According to Fig. 1, will notice if DL subframe is dynamically altered the subframe for UL, so traditional UE is by for described former thereby obtain incorrect DL channel quality measurement.Yet, if UL subframe is dynamically altered the subframe for DL, will can there is not problem so.Reason is that when UE should send to serving BS by uplink data by controlling for the serving BS of UE.By controlling UE, in the time slot identical with the novel UE of receiving downlink data, do not send uplink data, will problem can not occur.And when the UL of traditional UE HARQ occurs in the subframe of dynamically changing into DL subframe for novel UE, the UL HARQ of traditional UE will disturb the DL of novel UE.
In view of above theoretical foundation, the present invention discloses a kind of dynamic TDD configuration mechanism, its follow in following three kinds of criterions at least one or more than one, because the suitable relation between need to configuring for the dynamic TDDDL-UL configuration of novel UE and the TDD DL-UL of current configuration.(1) the TDD configuration of current configuration that need to be based on for traditional UE for the dynamic TDD configuration of novel UE.(2) situation of needs being avoided the UL HARQ of traditional UE occur in being dynamically reconfigured for the subframe of DL subframe for novel UE, so that the UL HARQ of traditional UE will can not disturb the DL of novel UE.(3) need to avoid DL subframe to be dynamically reconfigured for the situation of UL subframe.By following above-mentioned criterion, when base station dynamically configures or reconfigures subframe for the novel UE that has dynamic TDD and reconfigure ability, the new dynamic TDD configuration of described three criterions of meeting of novel UE will for example, be selected to be identified in base station from TDD configuration set (set of Fig. 1).Therefore, aforementioned criteria will define the permission set of dynamic TDD configuration in order to the current TDD configuration defining according to the SI for traditional UE as sending from base station.
Fig. 2 A is the flow chart that dynamic TDD configuration suitable various definite logics by whether are determined in explanation to Fig. 2 C.Fig. 2 A is the flow chart that logic is determined in explanation first, and described definite logic can be applicable to have for different objects novel UE and the base station of dynamic TDD configuration mechanism.In step S411, by acquiescence, TDD configures configuration-system.Default configuration can be the dynamic TDD configuration of previous configuration, or default configuration can be the current TDD configuration that traditional UE is used.In step S412, will determine that whether a kind of dynamic TDD configuration is by the interference causing between the UL HARQ transmission of traditional UE and the DL transmission of novel UE.If so, in step S413, will abandon described dynamic TDD configuration so, and can determine new dynamic TDD configuration.If can not disturb, in step S414, acquiescence sub-frame configuration will be changed into described dynamic TDD configuration so in step S412.
Fig. 2 B is the flow chart that logic is determined in explanation second, and described definite logic can be applicable to have for different objects novel UE and the base station of dynamic TDD configuration mechanism.In step S421, by acquiescence, TDD configures configuration-system.Default configuration can be the dynamic TDD configuration of previous configuration, or default configuration can be the current TDD configuration that traditional UE is used.In step S422, will determine whether described dynamic TDD configuration will cause that DL subframe is dynamically altered the situation for UL subframe.If so, in step S423, acquiescence subframe can not be changed into this dynamic TDD configuration so, because may need to determine new dynamic TDD configuration.In step S424, if described dynamic TDD configuration will can not cause that DL subframe is dynamically altered the situation for UL subframe, so novel UE will replace acquiescence TDD to configure to transmit and receive data with described dynamic TDD configuration.And described dynamic TDD configuration will belong to permission set, or in other words, be regarded as appropriate dynamic TDD configuration.It should be noted that, independently definite logic of application drawing 2A and Fig. 2 B.
Fig. 2 C is that of definite logic of Fig. 2 A and Fig. 2 B may combine.In step S431, by acquiescence, TDD configures configuration-system.Default configuration can be the dynamic TDD configuration of previous configuration, or default configuration can be the current TDD configuration that traditional UE is used.In step S432, will determine that whether a kind of dynamic TDD configuration is by the interference causing between the UL HARQ transmission of traditional UE and the DL transmission of novel UE.If so, in step S433, will abandon described dynamic TDD configuration so, and can determine new dynamic TDD configuration.If can not disturb, in step S434, will determine whether described dynamic TDD configuration will cause that DL subframe is dynamically altered the situation for UL subframe so in step S432.If so, in step S435, acquiescence subframe can not be changed into this dynamic TDD configuration so, because may need to determine new dynamic TDD configuration.In step S434, if described dynamic TDD configuration will can not cause that DL subframe is dynamically altered the situation for UL subframe, so novel UE will replace acquiescence TDD to configure to transmit and receive data with described dynamic TDD configuration.And described dynamic TDD configuration will belong to permission set, or in other words, be regarded as appropriate dynamic TDD configuration.It should be noted that, it will be understood by those skilled in the art that step S432 and S433 can exchange with step S434 and S435, will produce identical result because first implemented Fig. 2 A or first implemented Fig. 2 B before Fig. 2 B before implementing Fig. 2 A.
By following Fig. 2 A to definite logic of Fig. 2 C, can derive the dynamic TDD configuration set of permission corresponding to each current TDD configuration according to one exemplary embodiment of the present invention.The TDD configuration of the form based on Fig. 1, can come for each the definite TDD of the permission configuration set in seven kinds of TDD configurations of Fig. 1 to definite logic of Fig. 2 C by following Fig. 2 A.This type of result can gather for the form shown in table 3, described form is shown definite result of application drawing 2A and Fig. 2 B, and described form can be stored in base station and novel UE, so that base station and novel UE can be by determining with described form whether a kind of dynamic TDD configuration is appropriate or allows.
| TDD configuration | Allow dynamic TDD configuration set Bi |
| 0 | 0 |
| 1 | 1,2,4,5 |
| 2 | 2,5 |
| 3 | 3,4,5 |
| 4 | 4,5 |
| 5 | 5 |
| 6 | 6 |
Table 3
It should be noted that if use the incompatible replacement Fig. 1 of different TDD config sets, those skilled in the art still can follow principle of the present invention to produce different forms by following three aforementioned criteria that Fig. 2 A implemented to definite logic of Fig. 2 C so.
Hereinafter the derivation of the form of table 3 will further be illustrated.For the ease of explaining, the set that is delivered to the current TDD configuration of traditional UE with signal can be by i; { 0,1,2,3,4,5,6} represents i ∈, and it is complete current TDD configuration set as shown in Figure 1.Because dynamically TDD configuration will be based on current TDD configuration i, institute can be based on i cause B for the appropriate dynamic TDD configuration set of each current TDD configuration of novel UE
irepresent.
The principle of follow procedures S412, it may be noted that during all UL HARQ, line repeats for each radio frame except TDD configuration 0 and 6, and described radio frame is 10 milliseconds.By the TDD configuration for i=0 or i=6 dynamically being changed into different TDD configurations by the interference causing between the UL HARQ transmission of traditional UE and the DL transmission of novel UE, because can observe from Fig. 1, during UL HARQ, line does not repeat in the same manner between each group radio frame.Therefore, B
0={ 0} and B
6={ 6}.This will mean, when current TDD is configured to the configuration 0 for traditional UE, dynamically TDD configuration can not change and should remain on 0.When current TDD is configured to the configuration 6 for traditional UE, dynamically TDD configuration can not change and should remain on 6.Therefore, by following separately definite logic of Fig. 2 A, as i=0 respectively, 1,2,3,4,5,6 o'clock, B
0={ 0}, B
1={ 1,2,3,4,5}, B
2={ 1,2,3,4,5}, B
3={ 1,2,3,4,5}, B
4={ 1,2,3,4,5}, B
5={ 1,2,3,4,5} and B
6={ 6}.
Avoid traditional UE to there is incorrect DL measurement result the principle of follow procedures S422, so that will avoid DL subframe to be dynamically altered the situation for UL subframe.Thereby set B i consists of its superset in configuration i TDD configuration DL subframe forms.Therefore, by following separately the principle of Fig. 2 B, when i=0, B
0=0,1,2,3,4,5,6}, and when i=1, B
1=1,2,4,5}, and when i=2, B
2=2,5}, and when i=3, B
3=3,4,5}, and when i=4, B
4=4,5}, and when i=5, B
5=5}, and when i=6, B
6={ 1,2,3,4,5,6}.
If need to meet the criterion of Fig. 2 A and Fig. 2 B, the content that table 3 is shown is so the result of combination that is definite logic of Fig. 2 A and Fig. 2 B, and this type of combination can be definite logic of Fig. 2 C.In order to meet the criterion of Fig. 2 A, when i=0 or 6, B
0={ 0} or B
6={ 6}.In order to meet the criterion of Fig. 2 B, when i=1, B
1=1,2,4,5}, and when i=2, B
2=2,5}, and when i=3, B
3=3,4,5}, and when i=4, B
4=4,5}, and when i=5, B
5={ 5}.The above results will gather for table 3.
When the derivation of i=1,2,3, table 34 and 5 time will further provide with following these examples.Referring to the explanation of Fig. 1, suppose that current TDD is configured to configure 1, configure so 2 and will belong to permission TDD configuration set.Reason is that the DL subframe of configuration 1 is subframe 0,4,5 and 9, and the DL subframe of configuration 2 is subframes 0,3,4,5,8,9.Because subframe 0,4,5 and 9 is subsets of subframe 0,3,4,5,8,9, so after being switched to configuration 2, any DL subframe of configuration 1 can dynamically not changed into UL subframe.Configuration 4 and 5 is also so, and wherein, after being switched to configuration 5, any DL subframe of configuration 1 can dynamically not changed into UL subframe.Note that for configuration 3, from configure 1 be switched to configuration 3 after, DL subframe numbering 4 will be switched to UL subframe; Therefore, configuration 3 does not belong to the dynamic TDD configuration set of configuration 1.And, mention, for current TDD, configure the situation of 1 o'clock, eliminated the possibility that is switched to configuration 0 or 6, because if configuration 1 is switched to any in configuration 0 and 6, UL HARQ will occur in the subframe changing into DL subframe so, so that the UL HARQ of traditional UE will disturb the HARQ of novel UE.
For another example, the configuration 5 of observation Fig. 1.Because the configuration 5 in all configurations of Fig. 1 has maximum DL subframes, so can not make to configure 5 in the situation that not making at least one DL subframe be switched to UL subframe, be switched to another configuration.Therefore for configuring 5 the dynamic TDD configuration of permission subset, will be, only configuration 5.Because those skilled in the art can derive by following above-mentioned principle and example the permission subset of other configuration, so will no longer be recycled and reused for the derivation of other configuration.
Therefore, the form of table 3 has in the memory that dynamic TDD configured/reconfigured the novel UE of ability and the serving BS of novel UE being stored in.When the TDD configuration of novel UE must dynamically be adjusted in base station due to the needs of network traffics, the dynamic TDD configuration for novel UE is selected by the dynamic TDD configuration set of permission of each the current TDD configuration from corresponding to for traditional UE in base station.For instance, if be 3 for the current TDD configuration of traditional UE, so according to table 3, dynamically TDD configuration can only be configuration 3,4 or 5.If the current TDD configuration for traditional UE is 0,5 or 6, to substantially not allow dynamic TDD to reconfigure so, for example, until current TDD configuration is changed into different current TDD configurations (configuring 1,2,3 and 4) via the variation in SI.
Should note, in alternate embodiment, replace to use to be stored in the look-up table in memory, the definite logic that is the form of numeral or analog circuit can be in order to determine that the permission whether a kind of dynamic TDD configuration belong to the current TDD configuration based on being used by traditional UE gathers.
Above-described embodiment operates relevant backward compatibility problem by solution with UE measurement and HARQ between traditional UE and novel UE.Yet the dynamic switching of TDD configuration also will cause problem between novel UE, reason is with relevant with the interruption of soft buffer management for the HARQ sequential logic mismatch of novel UE as previously mentioned.Therefore, in order to solve described problem, by the dynamic TDD configuration set definition of the permission with respect to will be described in more detail below UL HARQ timing reference U
i, DL HARQ timing reference D
ithe maximum number M of He Mei community DL HARQ process
dL_HARQ.Described solution can be expressed as series of steps by Fig. 3.
In step S501, can use the technology of being described by Fig. 2 A, Fig. 2 B or Fig. 2 C and its corresponding written description obtain may TDD configuration for each the dynamic TDD configuration set of permission, and one may be illustrated by table 3 by final result, table 3 is shown the dynamic TDD configuration set of the permission B for TDD configuration i
i, wherein, for LTE communication system, be conventionally the integer between 0 to 7; Yet, at the predetermined TDD allocation list of the Fig. 1 for LTE communication system, in future, can be more than 7 any integers by change in the situation that.The result for being produced by Fig. 2 A or Fig. 2 B allow dynamic TDD configuration set to be not limited to table 3, because also can be used in this step.
In step S502, the UL HARQ timing reference configuration U of TDD configuration i will be identified for
i.Can be by being B from UL subframe wherein
iin the B of superset of each TDD configuration
iselect TDD configuration and determine UL HARQ timing reference configuration U
i.If there are a plurality of TDD configurations that meet aforementioned criteria, the TDD configuration with the UL subframe of minimal number will be chosen as to described reference configuration so.In general, during traditional UE is configured the time cycle for TDD configuration i, for the UL HARQ sequential of novel UE, will follow for TDD configuration U
ithe sequential of definition.
For instance, suppose that the dynamic TDD configuration set of permission in the situation when traditional UE has been configured for TDD and configures 1 is 1,2,4 and 5 (because table 3 explanation B
i=1=1,2,4,5), this will mean that novel UE can switch between the TDD of Fig. 1 configuration 1,2,4 and 5.According to Fig. 1, for configuring 1 UL subframe, be subframe 2,3,6,7 and 8.For configuring 2 UL subframe, it is subframe 2,6 and 7.For configuring 4 UL subframe, be subframe 2 and 3.For configuring 5 UL subframe, it is subframe 2.The special subframe that it should be noted that Fig. 1 has been counted as downlink subframe.In this example, can observe, the uplink sub-frames 1,2,3,6,7 and 8 of configuration 1 is the superset of the uplink sub-frames of configuration 2,4 and 5.In other words, the uplink sub-frames of configuration 2,4 and 5 is subsets of configuration 1.Therefore, configuration 1 will be chosen as U
i=1time the configuration of the TDD for UL HARQ timing reference configuration.This will mean when traditional UE has been configured for TDD and configures 1, for the reference sequential of the UL HARQ operation of novel UE, will follow the reference sequential of TDD configuration 1 as shown in Figure 1.Other TDD configuration for i ≠ 1 o'clock, please refer to following table 4, wherein the final result of the 3rd row explanation implementation step S502 from left to right.It should be noted that in this particular instance UL-HARQ timing reference configuration U
ithe current TDD following for traditional UE by the principle of follow procedures S502 is configured.
Table 4
In step S503, the DL HARQ timing reference configuration of each TDD configuration will be identified for.By selecting wherein DL subframe, be B
iin each TDD configuration superset TDD configuration and find out the TDD configuration Di for DL HARQ reference.If there are a plurality of TDD configurations that meet aforementioned criteria, the TDD configuration with the DL subframe of minimal number will be chosen as to DL HARQ reference configuration so.In general, during traditional UE is configured the time cycle into TDD configuration i therein, for the DL HARQ sequential of novel UE, the sequential defining for TDD configuration Di will be followed.
For instance, suppose that the dynamic TDD configuration set of permission in the situation when traditional UE has been configured for TDD and configures 3 is 3,4 and 5 (because table 3 explanation B
i=3=3,4,5), this will mean that novel UE can switch between the TDD of Fig. 1 configuration 3,4 and 5.According to Fig. 1, for configuring 3 DL subframe, be subframe 0,1,5,6,7,8 and 9.For configuring 4 DL subframe, it is subframe 0,1,4,5,6,7,8 and 9.For configuring 5 DL subframe, it is subframe 0,1,3,4,5,6,7,8 and 9.It should be noted that special subframe has been counted as downlink subframe.The in the situation that of DL, can observe from Fig. 1, configuration 5 has maximum downlink subframe in all TDD configurations.Therefore, the downlink subframe 0,1,3,4,5,6,7,8 and 9 of configuration 5 is supersets of the downlink subframe of configuration 3 and 4.In other words, the uplink sub-frames of configuration 3 and 4 is subsets of configuration 5.Therefore, configuration 5 will be chosen as U
i=1time the configuration of the TDD for UL HARQ timing reference configuration.This will mean when traditional UE has been configured for TDD and configures 5, for the reference sequential of the DL HARQ operation of novel UE, will follow the reference sequential of TDD configuration 5 as shown in Figure 1.Other TDD configuration for i ≠ 3 o'clock, please refer to table 4, wherein the final result of secondary series explanation implementation step S503 from right to left.
In step S504, the M of novel UE will be identified for for each TDD configuration i
dL_HARQparameter.In general, can configure and predefined M by the TDD based on for be used for DL HARQ Di through selection
dL_HARQparameter is identified for the M of novel UE
dL_HARQparameter.In other words, for the soft buffer of novel UE, set and will follow the setting of the DL HARQ timing reference configuration defining as the secondary series from right to left at table 4.For instance, suppose to be configured to configure 1 for the TDD configuration of traditional UE, so according to table 4, for D
i=1the timing reference configuration of selecting will configure 5 for TDD.Because according to table 2, for the M of TDD configuration 5
dL_HARQparameter is 15, therefore for the soft buffer of DL HARQ of novel UE, sets or M
dL_HARQto be 15.And, because D
i=2,3,4,5therefore be all 15, for i=2,3,4,5 M
dL_HARQparameter is all 15.In addition, because according to table 2, for the M of TDD configuration 0 and 7
dL_HARQparameter is respectively 4 and 6, therefore the M for novel UE when i=0 and 7
dL_HARQto be respectively 4 and 6.
According to one exemplary embodiment, result shown in table 4 can be known for novel UE and base station, for example table 4 is stored as to look-up table in medium or uses analog or digital circuit enforcement table 4 to make when novel UE receives dynamic TDD and configures/reconfigure signaling command, UE can configure i and know corresponding B based on being configured current TDD for traditional UE
i, U
i, D
iand M
dL_HARQparameter and without extra signaling consumption.Look-up table is not limited to table 4.For another example, the principle by following Fig. 2 B is to select B
i, as i=0 and B
0=during 0,1,2,3,4,5,6}, D
0to be 5 and M
dL_HARQto be 15, and as i=6 and B
6=during 1,2,3,4,5,6}, D
6to be 5 and M
dL_HARQto be 15.
Fig. 4 explanation is according to the disclosed dynamic TDD configuration mechanism of the angle from base station of one exemplary embodiment of the present invention.In step S701, current TDD configuration will for example, be selected with processor in base station from predetermined TDD configuration set (Fig. 1) according to present flow rate demand.Current TDD configuration will and can obtain from system information block with traditional UE compatibility.In step S702, UE will select dynamic TDD configuration based on described current TDD configuration with processor send current TDD configuration via reflector after.
In step S703, the configuration of DL-HARQ timing reference will be determined from predetermined TDD configuration set in base station.The criterion of determining the configuration of DL timing reference is that the downlink subframe of DL-HARQ timing reference configuration is the superset that each TDD of the permission set of dynamic TDD configuration configures.The criterion of determining the permission set of dynamic TDD configuration is to select the downlink subframe of current TDD configuration not reconfigure to the likely TDD configuration of institute of uplink sub-frames from predetermined TDD configuration set.Optionally, in step S705, UE will select the configuration of UL-HARQ timing reference from predetermined TDD configuration set.The criterion of determining the configuration of UL-HARQ timing reference is that the uplink sub-frames of UL-HARQ timing reference configuration is the superset that each TDD of the permission set of dynamic TDD configuration configures.
In step S704, HARQ process will be implemented by following by the reference sequential of DL-HARQ timing reference configuration definition in base station.Optionally, in step S706, M will be determined by following the configuration of DL-HARQ timing reference in base station
dL_HARQ.
Fig. 5 is that explanation is according to the disclosed dynamic TDD configuration mechanism of the angle from UE of one exemplary embodiment of the present invention.In step S801, UE will receive current TDD configuration from predetermined TDD configuration set.Current TDD configuration will and can obtain from system information block with traditional UE compatibility.In step S802, UE will receive dynamic TDD configuration based on described current TDD configuration receive current TDD configuration via receiver after.
In step S803, UE will determine the configuration of DL-HARQ timing reference from predetermined TDD configuration set.The criterion of determining the configuration of DL-HARQ timing reference is that the downlink subframe of DL-HARQ timing reference configuration is the superset that each TDD of the permission set of dynamic TDD configuration configures.The criterion of determining the permission set of dynamic TDD configuration is to select the downlink subframe of current TDD configuration not reconfigure to the likely TDD configuration of institute of uplink sub-frames from predetermined TDD configuration set.Optionally, in step S805, UE will select the configuration of UL-HARQ timing reference from predetermined TDD configuration set.The criterion of determining the configuration of UL-HARQ timing reference is that the uplink sub-frames of UL-HARQ timing reference configuration is the superset that each TDD of the permission set of dynamic TDD configuration configures.
In step S804, UE will implement HARQ process by following by the reference sequential of DL-HARQ timing reference configuration definition.Optionally, in step S806, UE will determine M by following the configuration of DL-HARQ timing reference
dL_HARQ.
In addition, the aperiodicity channel status reporting timing reference configuration C of TDD configuration i will be identified for
i.Can be by being B from UL subframe
iin the B of superset of each TDD configuration
iselect TDD configuration and determine described aperiodicity channel status reporting timing reference configuration C
i.If there are a plurality of TDD configurations that meet aforementioned criteria, the TDD configuration with the UL subframe of minimal number will be chosen as to described reference configuration so.
Specifically, the sequential of aperiodicity channel status reporting is similar to the sequential in UL-HARQ program.Therefore, the configuration of aperiodicity channel status reporting timing reference can be identical with the configuration of UL-HARQ timing reference.
In view of aforementioned description content, the present invention is suitable for using in wireless communication system, and can be so that the mode with traditional UE (before LTE the 12nd edition) back compatible is dynamically configured or reconfigure TDD DL-UL configuration for novel UE (LTE the 12nd edition or version after it).And novel UE can be in the situation that be associated with the unexpected interference of HARQ sequential mismatch problem and the soft buffer setting of HARQ, dynamically switching in different time division duplex configurations.
In the present invention, the keyword of 3GPP class or term are only used as example to present according to inventive concept of the present invention; For example, yet the same concept presenting in the present invention can be applied to any other system, IEEE802.11, IEEE802.16, WiMAX etc. by those skilled in the art.
Base station in the present invention also can comprise base station, for example, advanced base station (advanced base station, ABS), base station transceiver system (base transceiver system, BTS), Node B, evolved Node B (eNB), the eNB of family, macro base station (macro base station), femto base station (pico base station), femto base station (femto base station), access point, Home eNodeB, relay station, transponder, intermediate node, centre and/or satellite-based communication base station.
From hardware viewpoint, base station can comprise at least (but being not limited to) transmitter circuit, acceptor circuit, mould/number (A/D) transducer, D/A (D/A) transducer, treatment circuit, one or more antenna elements, and the medium of optionally selecting.Reflector and receiver send down link signal and receiving uplink signal with wireless mode.Receiver can comprise the function element of carrying out operations such as low noise amplification, impedance matching, mixing, frequency reducing, filtering, amplification.Reflector can comprise the function element of carrying out operations such as amplification, impedance matching, mixing, raising frequency, filtering, power amplification.Mould/number (A/D) or D/A (D/A) transducer are configured to from analog signal format, be converted to digital signals format during uplink signal is processed and from digital signals format, are converted to analog signal format during down link signal are processed.
Treatment circuit is configured to mechanism, function, program or the method step of the method that in one exemplary embodiment of the present invention processing digital signal and execution propose.And treatment circuit can optionally be couple to memory circuitry with storage programming code, device configuration, code book (codebook), data through cushioning or permanent data etc.The function for the treatment of circuit can be used programmable units such as microprocessor, microcontroller, dsp chip, FPGA to implement.The function for the treatment of circuit also available independent electronic installation or IC is implemented, and treatment circuit also available hardware or implement software.
In the present invention, term " subscriber equipment " (UE) can represent various embodiment, its (for example) can be including (but not limited to) mobile radio station, advanced mobile radio station (advanced mobile station, AMS), server, client, desktop PC, laptop computer, network computer, work station, personal digital assistant (personal digital assistant, PDA), tablet personal computer (personal computer, PC), scanner, telephone device, beep-pager, camera, TV, handheld video games device, music apparatus, wireless senser etc.In some applications, UE can be the stationary computer device operating in mobile environment such as bus, train, aircraft, ship, automobile.
From hardware viewpoint, UE can comprise at least (but being not limited to) transmitter circuit, acceptor circuit, mould/number (A/D) transducer, D/A (D/A) transducer, treatment circuit, one or more antenna elements, and the memory circuitry of optionally selecting.Memory circuitry can be stored programming code, device configuration, data or permanent data, code book etc. through cushioning.Treatment circuit is available hardware or implement software also, and will be regarded as implementing mechanism, function, program and the method step of embodiments of the invention.The function class of each element of UE is similar to controls node and therefore by the detailed description not repeating each element.
The element, action or the instruction that are used for the detailed description of of the present invention disclosed embodiment should not be construed as for purposes of the invention for definitely crucial or necessary, unless so described clearly.And as used herein, word " " can comprise one to begin a project.If intend to refer to an only project, will use so term " single " or similar language throughout.In addition, as used herein, the term before the list of a plurality of projects and/or a plurality of project kinds " in any " wishes to comprise described project and/or project kind individually or in conjunction with other project and/or other project kind " in any ", " in any combination ", " in any a plurality of " and/or " in a plurality of any combinations ".In addition, as used herein, term " set " wishes to comprise any quantity project, comprises zero.In addition, as used herein, term " quantity " wishes to comprise any quantity, comprises zero.
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.In addition, unless statement especially, claims should not be considered as being limited to described order or element.
Claims (14)
1. use a communication system for dynamic time division duplex configuration mechanism, it is characterized in that, comprising:
For select the module of current time division duplex configuration from predetermined time division duplex configuration set;
For select the module of dynamic time division duplex configuration based on described current time division duplex configuration after sending described current time division duplex configuration;
For determining that from described predetermined time division duplex configuration set down link mixes the module of request timing reference configuration automatically, wherein, the described down link mixing downlink subframe that request timing reference configures is automatically the superset that each time division duplex of the permission set of dynamic time division duplex configuration configures, wherein, dynamically the described permission set of time division duplex configuration comprises that one or more may configure by time division duplex, the described dynamic time division duplex configuration that each downlink subframe of wherein said current time division duplex configuration is not selected from described permission set is reconfigured for uplink sub-frames, and
For mix the reference sequential of request timing reference configuration automatically by following described down link, implement the module of mixed automatic repeat request process.
2. communication system according to claim 1, wherein said permission set further comprises that one or more may configure by time division duplex, and the described dynamic time division duplex configuration that each subframe that is assigned to mixed automatic repeat request up link of wherein said current time division duplex configuration is not selected from described permission set is reconfigured for downlink subframe.
3. communication system according to claim 1, also comprises:
For select up link from described predetermined time division duplex configuration set, mix the module of request timing reference configuration automatically, wherein, the uplink sub-frames that described up link mixing asks timing reference to configure is automatically the superset that each time division duplex of the described permission set of dynamic time division duplex configuration configures.
4. communication system according to claim 1, wherein to mix the maximum number of request be automatically mix request timing reference configuration automatically and define based on described down link to down link.
5. communication system according to claim 1, also comprises and for the mechanism via with legacy user's hardware compatibility, at system information block, sends the module of described current time division duplex configuration.
6. communication system according to claim 1, if wherein described current time division duplex is configured to 0 or 6, so described down link mixes request timing reference configuration automatically and is respectively 0 or 6.
7. communication system according to claim 6, if wherein described current time division duplex is configured to 1,2,3,4 or 5, so described down link mixes request timing reference automatically and is configured to 5.
8. communication system according to claim 3, wherein said up link is mixed request timing reference configuration automatically and is configured identical with described current time division duplex.
9. communication system according to claim 3, wherein the configuration of aperiodicity channel status reporting timing reference mixes request timing reference automatically with described up link and configures identical.
10. communication system according to claim 4, if wherein described current time division duplex is configured to 1,2,3,4 or 5, the maximum number that so described down link mixes request is automatically 15.
11. 1 kinds of application rights require the communication means of the communication system described in 1, it is characterized in that, comprising:
At current time division duplex, being configured to 1,2,3,4 or, one down link at 5 o'clock mixes request timing reference automatically and is configured to 5.
12. communication meanss according to claim 11, also comprise:
It is identical with described current time division duplex configuration that up link is mixed request timing reference configuration automatically.
13. communication meanss according to claim 11, also comprise:
The configuration of aperiodicity channel status reporting timing reference mixes request timing reference automatically with described up link and configures identical.
14. communication meanss according to claim 11, also comprise:
At current time division duplex, be configured to 1,2,3,4 or at 5 o'clock, the maximum number that down link mixes request is automatically 15.
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361818924P | 2013-05-03 | 2013-05-03 | |
| US61/818,924 | 2013-05-03 | ||
| US201361832159P | 2013-06-07 | 2013-06-07 | |
| US61/832,159 | 2013-06-07 | ||
| US14/228,267 US9755816B2 (en) | 2013-03-28 | 2014-03-28 | Dynamic TDD configuration method and a base station using the same |
| US14/228,267 | 2014-03-28 | ||
| US14/267,908 US9503248B2 (en) | 2013-03-28 | 2014-05-01 | User equipment and base station using dynamic TDD configuration mechanism |
| US14/267,908 | 2014-05-01 |
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| CN104135352A true CN104135352A (en) | 2014-11-05 |
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| CN201410183652.3A Expired - Fee Related CN104135352B (en) | 2013-05-03 | 2014-05-04 | Use the communication system and method for the duplexing configuration mechanism of dynamic Time Division |
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| WO2018201710A1 (en) * | 2017-05-02 | 2018-11-08 | 深圳市金立通信设备有限公司 | Hybrid automatic repeat request handoff control method and feedback device |
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