CN104135352B - Use the communication system and method for the duplexing configuration mechanism of dynamic Time Division - Google Patents
Use the communication system and method for the duplexing configuration mechanism of dynamic Time Division Download PDFInfo
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Abstract
The present invention be directed to the communication system and method using duplexing (TDD) configuration mechanism of dynamic Time Division.The present invention is disclosed by implementing the dynamic TDD mechanism to the dynamic TDD configuration impulsive constraints to attach to permission dynamic TDD configuration sets.Up-link and the configuration of downlink HARQ timing reference can be exported from the permission dynamic TDD configuration sets.The permission TDD configuration sets, uplink HARQ timing reference configuration and downlink HARQ timing reference configuration can be exported based on specific rules.Maximum number for TDD downlink HARQ process will comply with the downlink HARQ timing reference configuration.
Description
Technical field
The present invention be directed to use duplexing (dynamic time division duplex, the TDD) configuration machine of dynamic Time Division
The communication system and method for system.
Background technology
" it is used for the LTE time division duplexs (TDD) of downlink-uplink (DL-UL) interference management and adaptive-flow
Further enhance (Further Enhancements to LTE Time Division Duplex (TDD) for Downlink-
Uplink (DL-UL) Interference Management and Traffic Adaptation) " theme be agreed
It is used as 3GPP the 11st edition research project and 3GPP the 12nd edition job.3GPP RAN1 and RAN4 work group have entered
The Performance Evaluation gone to various deployment scenarios.It has been shown that can be by allowing in Long Term Evolution (LTE) time division duplex (TDD)
Enter Mobile state in system to be reconfigured to considerably improve average ceU throughput.
TDD schemes will provide flexible deployment in the case where not needing multiple frequency spectrum resources.Currently, LTETDD will pass through
There is provided the seven kinds of different downlink-uplink (DL-UL) being semi-statically configured configurations (as shown in table 1 below) not right to realize
Claim DL-UL distribution, and these distribution can provide 40% to 90% DL subframe.
Table 1
More specifically, this seven kinds different DL-UL being semi-statically configured configurations are indexed simultaneously in the left column of table 1
And numbering is 0 to 6.In the present invention, DL-UL configurations are also known as TDD configurations or TDD DL-UL configurations.Match somebody with somebody for every TDD
Put, the subframe of radio frame will be configured as downlink subframe, uplink sub-frames or special subframe, and the top row of table 1
Show the index of subframe number.Therefore, in order to by radio frame configurations be with certain number of downlink and up-link
Time slot, enode b (eNB) will send one in the UL-DL configurations in system information (SI).
For example, if network has gone through heavy downlink traffic, then eNB can determine that TDD configurations 5,
The TDD configurations 5 will be sent to UE (user equipment) and provide 8 downlink time slots and 1 by each radio frame
Uplink time slot.If however, suddenly change is heavy uplink traffic to heavy downlink traffic, then
ENB may not change TDD configurations immediately, and have to be by modification system information to pass on the change, and for passing
The modification of system UE system information can only change boundary.This will imply that, match somebody with somebody via SI changes to reconfigure TDD
It will be semi-static rather than dynamic to put, and may mismatch instantaneous delivery situation.
Compared with changing system information program, it is known that dynamic reconfigure technology the cycle of much shorter will be needed to carry out
TDD is reconfigured.Assessment in corresponding research project based on adaptive-flow in small cell by realizing TDD DL-UL
It is reconfigured to that significant performance benefits are presented, such as " is used for downlink-uplink (DL-UL) interference management and flow certainly
The LTE time division duplexs (TDD) of adaptation further enhance (Further enhancements to LTE Time Division
Duplex(TDD)for Downlink-Uplink(DL-UL)interference management and traffic
Adaptation) " (TR38.828, V11.0.0,2012 years June of 3GPP) is mentioned, and the document comes for the purpose of definition
It is incorporated herein by reference.And, it has been shown that dynamic signaling mechanism will surpass using changing system information program
Mechanism.
Also, can be according to " physical channel and modulation (Physical Channels and for the purpose of definition
Modulation) " (TS36.211, V11.0.0,2012 years Septembers of 3GPP), " physical layer procedures (Physical Layer
Procedures) " (TS.213, V11.0.0,2012 years Septembers of 3GPP) and " medium plan (MAC) protocol specification)
(Medium Access Control (MAC) protocol specification) " (3GPP TS36.321) defines tdd frame
Structure, DL-UL configurations and UL-HARQ sequential relationships, the document are herein incorporated by reference this for the purpose of definition
Wen Zhong.
However, TDD configurations are reconfigured using dynamic technique will cause the not dynamic traditional UE for reconfiguring ability
There is different understanding to TDD DL-UL configurations with the new UE for possessing this ability, because tradition UE must comply with system information
Reprogramming, and new UE is possible to via such as physical layer signaling, medium access control (MAC) signaling or radio resource control
The dynamic signaling mechanism such as system (RRC) signaling configure to reconfigure TDD DL-UL.This can potentially result in various problems, comprising
The problem of being caused by UE measurements and mixed automatic repeat request (HARQ) operation.
HARQ is referred to as widely used transmission technology in modern wireless communication systems.HARQ is by occurring error of transmission
When resend the identical duplicate or another redundancy version of original transmitted and operated originally.Receiver then will be previously impaired
The transmission transmitted and resend is combined.In LTE TDD systems, institute is directed to by the different distribution of DL-UL subframes
State each in 7 kinds of configurations and indicate that the feedback information of error of transmission is transmitted again with corresponding to define individually and differently
Between sequential relationship.However, TDD configurations suddenly change can cause traditional UE with reconfiguring the new UE of ability with dynamic
Between HARQ operation interference.
Moreover, the dynamic of TDD configurations is reconfigured not only in traditional UE with reconfiguring the new of ability with dynamic
Throw into question and may be interfered between new UE between UE, because new UE is likely to be dependent on what is be dynamically selected
TDD is configured and for up-link and both downlink be there are different HARQ to refer to sequential.In addition, the dynamic weight of TDD configurations
New configuration will also throw into question in new UE soft buffer management process.
More specifically, TDD configurations are reconfigured using dynamic technique will be when UE undergoes HARQ procedure described in influence
UE soft buffer management.During DL HARQ procedures software buffers management can be briefly described for：For wherein descending chain
Payload is received in the transmission block from base station and is associated by each subframe that road transmission occurs between UE and base station, UE
In DL HARQ information.UE will be next based on downlink transmission be new transmission or old transmission and according to log-likelihood ratio (Log-
Likelihood Ratio, LLR) information by the payload store in a buffer or with being previously stored in a buffer
Payload is combined.UE responds the decoded result for receiving payload for being next based on storing in a buffer with ACK
Or NACK.It is discussed in detail on relevant with soft buffer setting, refer to quotation provided above.Moreover, UL HARQ will be with
Similar fashion works.
However, the dynamic change of TDD configurations will potentially result in the soft buffer that the suddenly change that is configured by TDD is caused
Unstability.Table 2 illustrates the maximum number (M of the DL-HARQ processes for TDD in typical LTE communication systemDL-HARQ)。
| TDD UL/DL are configured | The maximum number of HARQ procedure |
| 0 | 4 |
| 1 | 7 |
| 2 | 10 |
| 3 | 9 |
| 4 | 12 |
| 5 | 15 |
| 6 | 6 |
Table 2
In the case of FDD (FDD) system, the maximum of downlink HARQ process is currently defined as every service
Cell 8.It can be seen that in the case of a tdd system, be not constant per the maximum number of cell HARQ procedure, and will be according to clothes
Be engaged in base station SI in current TDD UL/DL configuration sets and change.In case of a downlink, DL-HARQ processes are most
Big figure will influence UE to configure the mode that soft buffer (soft buffer) sets.This means dynamically changed when TDD configurations
When, soft buffer setting will be also required to dynamically reconfigure.Therefore, soft buffer is set in UE and will have time to react it
Preceding unexpected change will cause the loss of data that is previously stored in soft buffer.
In addition, the pith for supporting the scheduling of downlink channel dependence is channel status reporting.Channel status reporting
ENB is supplied to by UE, and eNB can make scheduling decision based on the channel status reporting.A type of channel status reporting
It is non-periodic channel state report.Channel state request flag in network included in uplink scheduling by means of authorizing
And during clear request, deliver aperiodicity channel status reporting.Reconfiguring TDD configurations using dynamic technique will be in aperiodicity
Sequential logic mismatch is caused in channel status reporting.
Traditional UE (before the 12nd edition) reconfigures skill according to challenge referred to above with dynamic TDD DL-UL
Art is incompatible, it may be necessary to which new design avoids the potentially conflicting between traditional UE and new UE (the 12nd edition and thereafter version).
Moreover, new design is by the problem of need to solve to be attributed to the mispairing of HARQ sequential and be relevant with soft buffer management between new UE
Potentially conflicting.
The content of the invention
Therefore, the present invention be directed to the communication system using duplexing (TDD) configuration mechanism of dynamic Time Division.
According to one exemplary embodiment, the present invention discloses a kind of communication system, and it sends data comprising at least (but not limited to)
Transmitter, receive the receivers of data, and be coupled to the processor of the transmitter and the receiver.The processor
It will be configured for use in：Current time division duplex (time division duplex, TDD) is selected to match somebody with somebody from predetermined TDD configuration sets
Put；Configured after the current TDD configurations are sent via the transmitter based on the current TDD configurations selection dynamic TDD；
Downlink hybrid automatic request (downlink hybrid automatic are determined from the predetermined TDD configuration sets
Request, DL-HARQ) timing reference configuration, wherein the downlink subframe of DL-HARQ timing references configuration is dynamic
The superset of the every TDD configurations for allowing set of TDD configurations, wherein the described of dynamic TDD configurations allows set to include described work as
Each downlink subframe of preceding TDD configurations is not reconfigured by being configured selected from the dynamic TDD for allowing set
To one or more possible TDD configurations of uplink sub-frames；And configured by following the DL-HARQ timing references
Reference sequential and implement HARQ procedure.
One in one exemplary embodiment, the present invention discloses a kind of communication system, and it is included：For from predetermined TDD
Configuration set receives the module of current time division duplex (TDD) configuration；For matching somebody with somebody via the receiver reception current TDD
The module of dynamic TDD configurations is received after putting based on the current TDD configurations；For being determined from the predetermined TDD configuration sets
The configuration of downlink hybrid automatic request (downlink hybrid automatic request, DL-HARQ) timing reference
Module, wherein the downlink subframe of DL-HARQ timing references configuration, which is dynamic TDD configuration, allows each of set
The superset of TDD configurations, wherein each downlink for allowing set to include the current TDD configurations of dynamic TDD configurations
Subframe is not by selected from one or one for allowing the dynamic TDD configurations of set and reconfiguring to uplink sub-frames
May TDD configurations more than individual；And for implementing HARQ by following the reference sequential of the DL-HARQ timing references configuration
The module of process.
For the features described above and advantage of the present invention can be become apparent, special embodiment below, and it is detailed to coordinate accompanying drawing to make
Carefully it is described as follows.
Brief description of the drawings
Fig. 1 is the schematic diagram of line when illustrating the UL HARQ for being used for seven kinds of TDD configuration in LTE communication system.
Fig. 2A be illustrate according to an exemplary embodiment of the invention to determine to correspond to permitting for each current TDD configuration
Perhaps the flow chart of the technology of dynamic TDD configuration sets.
Fig. 2 B are to illustrate that another determination according to an exemplary embodiment of the invention is configured corresponding to each current TDD
Allow the flow chart of the technology of dynamic TDD configuration sets.
Fig. 2 C are the flow charts for illustrating to combine using one of Fig. 2A and Fig. 2 B technology.
Fig. 3 illustrate according to an exemplary embodiment of the invention determination UL HARQ timing references configuration, DL HARQ sequential
Reference configuration and MDL_HARQThe program of parameter.
Fig. 4 illustrates the dynamic TDD configuration mechanisms disclosed in the angle from base station according to an exemplary embodiment of the invention.
Fig. 5 is to illustrate the dynamic TDD configuration mechanisms disclosed in the angle from UE according to an exemplary embodiment of the invention.
Embodiment
With detailed reference to the one exemplary embodiment of the present invention, the example is illustrated in the accompanying drawings.All possible parts, phase
With reference marker in the accompanying drawings and the description to refer to same or similar part.
Currently, TDD LTE are by providing seven kinds of different asymmetric D L-UL being semi-statically configured to realize radio frame
Frame is distributed.In 3GPP is the 12nd edition, dynamic TDD configurations (eIMTA) are introduced, to cause base station can be based on traffic conditions come dynamically
Configure or reconfigure TDD configurations.The present invention relates to reconfigure functional single carrier LTE with dynamic TDD DL-UL
TDD system.In such systems, being configured or reconfigured TDD configurations using dynamic technique will reconfigure in not dynamic
Traditional UE of ability and possessing between dynamic reconfigures the new UE of ability throws into question, because tradition UE will be to current TDD
DL-UL configurations have the understanding different from new UE, because legacy system does not support dynamic to reconfigure feature.Cause
And, there will be various problems, most notably to UE measurement and HARQ operation it is related the problem of.Matched somebody with somebody when using dynamic TDD
When putting mechanism, traditional UE (the 11st edition or its version previous) will face various problems.
One problem can with the case where some DL subframes are dynamically changed into UL subframe tradition UE have not
Correct DL signaling qualities measurement result is related.If some DL subframes are dynamically changed into UL subframe, then measurement
As a result it will be likely to incorrect.More specifically, downlink reference signal incites somebody to action generally adjoint downlink, and up
Link reference signal will be generally with up-link.Current LTE standard is also indicated that, it is necessary to which tradition UE is performed in all DL subframes
It is signal quality measured.Therefore, when downlink subframe dynamically is switched into uplink sub-frames, shortage is dynamically weighed
Traditional UE of the ability of new configuration TDD sub-frame configurations still may perform downlink signal quality measurement, simply using being used for
Up-link and the reference signal for being intended for reconfiguring the new UE of ability with dynamic TDD.By using incorrect
Reference signal, traditional UE will be likely to obtain it is incorrect signal quality measured.
Another problem is related by traditional UE UL HARQ transmissions and again transmission, is occurring what is transmit/transmitted again
In the case that subframe has been dynamically altered for DL subframe, the transmission and again transmission may interfere with new UE.Problems
The systematic function and dispatching flexibility in the TDD system reconfigured with dynamic DL-UL can be had a strong impact on.In other words, such as
Fruit UL HARQ occur in the subframe for be changed to DL subframe, then UL HARQ will disturb new UE.
Another problem as previously mentioned will be relevant with the unexpected destruction that soft buffer is set.As previously mentioned, when
When TDD UL/DL configurations are dynamically reconfigured, soft buffer setting will correspondingly be changed based on the information that table 2 is provided.
When the unexpected change of soft buffer setting, the UE that dynamic TDD reconfigures ability is supported not have time to make necessary tune
It is whole, and therefore may for good and all lose the data being stored in soft buffer.
Another problem is relevant by the sequential logic mismatch with new UE in aperiodicity CSI report.Because aperiodicity CSI
The sequential of report is configured depending on TDD, therefore new UE will report CSI having changed into the subframe of downlink.
Dynamic herein is reconfigured it is meant that by using such as physical layer signaling, MAC layer signaling or RRC signaling
Fast signaling mechanism is implemented to reconfigure；And be used for reconfiguring for traditional UE and rely on using routine SIB transmission, it is in modification
New reconfigure is passed on after cycle.This will imply, when new UE is configured dynamically as new TDD configurations, tradition
UE still can change the TDD configurations of cycle implementation acquiescence for current SI, until changing described in next SI modifications cycle
Untill TDD is configured.
In view of foregoing problems, it is clear that can not be new dynamically to reconfigure by fast signalling in unrestricted mode
UE TDD configurations, so the present invention discloses a kind of dynamic TDD configuration mechanisms, it configures to dynamic TDD/to reconfigure mechanism strong
Plus some rules or constraint.Therefore, the present invention will provide UE and base station with dynamic TDD signaling mechanisms, the dynamic TDD letters
Mechanism is made to match somebody with somebody based on the current TDD DL-UL configuration settings for traditional UE for new UE appropriate dynamic TDD UL-DL
Put, the associated HARQ sequential for new UE will be set, and the associated soft buffer set for new UE is set.
The specific general of the present invention is illustrated by being described by Fig. 1 to Fig. 5, table 3, table 4 and the correspondence explanation to be supplied to these accompanying drawings
Read and embodiment.
Fig. 1 is the schematic diagram of line when illustrating the UL HARQ for being used for seven kinds of TDD configuration in LTE communication system, and Fig. 1
By the inventive concepts to illustrate the present invention.In the TDD system for LTE, it will come real in the way of different from FDD system
HARQ is applied, the ACK/NACK message in response to the transmission in subframe in FDD system will occur with relatively-stationary interval.So
And, for TDD system, the ACK/NACK message in response to the transmission in subframe will not occur with fixed intervals, and this is due to
Uplink sub-frames and downlink subframe with variable number are configured for different TDD.In general, when under use
Uplink subframe is received during down link data, will be sent out using next uplink sub-frames of at least four subframes are left
ACK/NACK is sent, vice versa.The delay of four subframes is due to caused by the processing delay of receiving terminal.
For example, for simplicity, using configuration 4, as UE, that first is sent on the subframe number 2 in frame N is up
During link content, same UE will receive corresponding ACK/NACK at frame N subframe number 8.Similarly, when the son in frame N
When the second up-link content is sent in frame number 3, corresponding ACK/NACK will be received at frame N subframe number 9.When UE exists
At subframe number 8 receive ACK/NACK signalings when, UE will at frame N+1 subframe number 2 send it is corresponding transmit again, with this
Analogize.
In view of Fig. 1, the basis of the present invention will be understood from following reasoning.According to Fig. 1, if it will be noted that DL subframe is by dynamic
UL subframe is changed on ground, then traditional UE will obtain incorrect DL channel quality measurements for the reason for having been described above.So
And, if UL subframe is dynamically altered for DL subframe, then will not occur problem.Reason is that UE serving BS will be controlled
When uplink data should be sent to serving BS by UE.By controlling UE not with receiving the new of down link data
Uplink data is sent in UE identical time slots, will not occur problem.Moreover, when tradition UE UL HARQ are for new
When type UE is dynamically changed to occur in the subframe of DL subframe, traditional UE UL HARQ will disturb new UE DL.
In view of above theoretical foundation, the present invention discloses a kind of dynamic TDD configuration mechanisms, it is followed in following three kinds of criterions
At least one or more than one, because will be required for new UE dynamic TDDDL-UL configurations and the TDD DL- being currently configured
Appropriate relation between UL configurations.(1) the dynamic TDD configurations for new UE will be needed based on being currently configured for traditional UE
TDD configuration.(2) it will need to avoid traditional UE UL HARQ to be dynamically reconfigured for DL subframe for new UE
Subframe in the situation that occurs, to cause traditional UE UL HARQ to will not interfere with new UE DL.(3) it will need to avoid DL
Subframe is dynamically reconfigured for the situation of UL subframe.By following above-mentioned criterion, when base station is for possessing dynamic TDD again
When the new UE of allocative abilities is dynamically configured or reconfigured subframe, base station will be from TDD configuration sets (such as the set of Fig. 1)
It is middle to be selected to determine the new dynamic TDD configurations for meeting three criterions for new UE.Therefore, aforementioned criteria will
To according to defining dynamic TDD configurations such as the current TDD configurations defined in the SI for tradition UE sent from base station
Allow set.
Fig. 2A to Fig. 2 C be illustrate to determine dynamic TDD configure by whether the flow chart of appropriate various determination logics.Fig. 2A
It is the flow chart for illustrating the first determination logic, and the determination logic can be applied to that there is dynamic TDD to match somebody with somebody for different purposes
Put both new UE and base station of mechanism.In step S411, system is configured with acquiescence TDD configurations.Default configuration can be for first
The dynamic TDD configurations of preceding configuration, or default configuration can the current TDD configurations used in tradition UE., will in step S412
Determine a kind of dynamic TDD configuration whether by the interference between the UL HARQ transmissions for causing traditional UE and new UE DL transmission.Such as
It is really, then in step S413 that will abandon the dynamic TDD configurations, and can determine that new dynamic TDD configurations.If
It will not be disturbed in step S412, then in step S414, acquiescence sub-frame configuration will be changed into the dynamic TDD and matched somebody with somebody
Put.
Fig. 2 B are the flow charts for illustrating the second determination logic, and the determination logic can be applied to tool for different purposes
There are both new UE and base station of dynamic TDD configuration mechanisms.In step S421, system is configured with acquiescence TDD configurations.Acquiescence
Configuration can configure for the dynamic TDD previously configured, or default configuration can the current TDD configurations used in tradition UE.In step
In rapid S422, by determine the dynamic TDD configurations whether by cause DL subframe to be dynamically altered for UL subframe situation.If
It is, then in step S423, it is impossible to which acquiescence subframe is changed into this dynamic TDD configuration, because may be it needs to be determined that new
Dynamic TDD configurations.In step S424, if the dynamic TDD configurations will not cause DL subframe to be dynamically altered for UL
The situation of subframe, then new UE will use the dynamic TDD configurations to replace acquiescence TDD configurations to send and receive data.And
And, the dynamic TDD configurations, which will belong to, allows set, or in other words, is considered as appropriate dynamic TDD configurations.It should be noted that
Can independently application drawing 2A and Fig. 2 B determination logic.
Fig. 2 C are that Fig. 2A be combined with a possibility of Fig. 2 B determination logic.In step S431, with acquiescence TDD configuration come
Configuration system.Default configuration can configure for the dynamic TDD previously configured, or default configuration can be current used in tradition UE
TDD is configured.In step S432, will determine a kind of dynamic TDD configuration whether will cause traditional UE UL HARQ transmissions with it is new
Interference between UE DL transmission.If it is then in step S433, the dynamic TDD configurations will be abandoned, and can determine that
New dynamic TDD configurations.If will not be disturbed in step S432, then in step S434, the dynamic will be determined
TDD configuration whether by cause DL subframe to be dynamically altered for UL subframe situation.If it is then in step S435, no
Acquiescence subframe can be changed into this dynamic TDD to configure, because may be it needs to be determined that new dynamic TDD is configured.In step S434
In, if the dynamic TDD configurations will not cause DL subframe to be dynamically altered the situation for UL subframe, then new UE will
Acquiescence TDD configurations are replaced to send and receive data using the dynamic TDD configurations.Moreover, the dynamic TDD configurations will belong to
Allow set, or in other words, be considered as appropriate dynamic TDD configurations.It should be noted that it will be understood by those skilled in the art that step
Rapid S432 and S433 can be exchanged with step S434 and S435, because implementing Fig. 2A first before Fig. 2 B or before Fig. 2A is implemented
Identical result will be produced by implementing Fig. 2 B first.
By following Fig. 2A to Fig. 2 C determination logic, can export according to an exemplary embodiment of the invention correspond to it is every
The permission dynamic TDD configuration sets of one current TDD configurations.The TDD configurations of form based on Fig. 1, can be by following Fig. 2A to figure
2C determination logic allows TDD configuration sets come each determination being directed to during Fig. 1 seven kinds of TDD are configured.One such result
Can collect can store for the form shown in table 3, the result of the determination of form displaying application drawing 2A and Fig. 2 B, and the form
In both base station and new UE, to cause both base station and new UE to determine a kind of dynamic by using the form
Whether TDD configurations are appropriate or allow.
| TDD is configured | Allow dynamic TDD configuration sets Bi |
| 0 | 0 |
| 1 | 1,2,4,5 |
| 2 | 2,5 |
| 3 | 3,4,5 |
| 4 | 4,5 |
| 5 | 5 |
| 6 | 6 |
Table 3
If it should be noted that replacing Fig. 1 using different TDD configuration sets, then those skilled in the art can still follow this
The principle of invention by following three aforementioned criterias that Fig. 2A to Fig. 2 C determination logic implemented to produce different forms.
It hereinafter will be evident from the derivation of the form of table 3.For the ease of explaining, it is delivered to traditional UE's with signal
The set of current TDD configurations can be by i；I ∈ { 0,1,2,3,4,5,6 } represent that it is complete current TDD configurations as shown in Figure 1
Set.Because dynamic TDD configurations will configure i based on current TDD, institute for new UE each current TDD configure it is appropriate
Dynamic TDD configuration sets can be based on i come by BiRepresent.
Follow procedures S412 principle, it is also important to note that except TDD is with addition to setting to 0 with 6, line is for every during all UL HARQ
Individual radio frame and repetition, the radio frame are 10 milliseconds.By the way that the TDD configurations for i=0 or i=6 are dynamically changed
Configured for different TDD by the interference between the UL HARQ transmissions for causing traditional UE and new UE DL transmission, because can be from Fig. 1
Observe, line is not repeated in the same manner between each group of radio frame during UL HARQ.Therefore, B0={ 0 } and B6={ 6 }.This will
It is meant that current TDD be configured for traditional UE with setting to 0 when, dynamic TDD configuration can not change and should be maintained at 0.Working as
When preceding TDD is configured for traditional UE configuration 6, dynamic TDD, which is configured, can not change and should be maintained at 6.Therefore, by individually abiding by
Fig. 2A determination logic is followed, as respectively i=0, when 1,2,3,4,5,6, B0={ 0 }, B1={ 1,2,3,4,5 }, B2=1,2,
3,4,5 }, B3={ 1,2,3,4,5 }, B4={ 1,2,3,4,5 }, B5={ 1,2,3,4,5 } and B6={ 6 }.
It will comply with step S422 principle to avoid traditional UE that there is incorrect DL measurement results, make it that DL will be avoided
Subframe is dynamically altered the situation for UL subframe.Thus, the TDD that set Bi constitutes its superset by DL subframe in configuration i matches somebody with somebody
Put composition.Therefore, by individually following Fig. 2 B principle, as i=0, B0={ 0,1,2,3,4,5,6 }, as i=1, B1=
{ 1,2,4,5 }, as i=2, B2={ 2,5 }, as i=3, B3={ 3,4,5 }, as i=4, B4={ 4,5 }, as i=5,
B5={ 5 }, and as i=6, B6={ 1,2,3,4,5,6 }.
If both Fig. 2A and Fig. 2 B criterion will be needed to meet, then the content that table 3 is shown will be Fig. 2A and Fig. 2 B
Determination logic combination result, and such combination can be Fig. 2 C determination logic.In order to meet Fig. 2A criterion,
As i=0 or 6, B0={ 0 } or B6={ 6 }.In order to meet Fig. 2 B criterion, as i=1, B1={ 1,2,4,5 }, works as i=2
When, B2={ 2,5 }, as i=3, B3={ 3,4,5 }, as i=4, B4={ 4,5 }, as i=5, B5={ 5 }.The above results
It will collect for table 3.
The derivation of table 3 when i=1,2,3,4 and 5 will be provided further with these following examples.Referring to saying for Fig. 1
It is bright, it is assumed that current TDD is configured to configuration 1, then configuration 2 will belong to permission TDD configuration sets.Reason is the DL subframe of configuration 1
It is subframe 0,4,5 and 9, and the DL subframe of configuration 2 is subframe 0,3,4,5,8,9.Because subframe 0,4,5 and 9 be subframe 0,3,4,
5th, 8,9 subset, so after configuration 2 is switched to, any DL subframe of configuration 1 is all without being dynamically changed to UL subframe.
Configuration 4 and 5 is also in this way, wherein after configuration 5 is switched to, any DL subframe of configuration 1 is all without being dynamically changed to UL
Subframe.It note that for configuration 3, be switched to from configuration 1 after configuration 3, DL subframe numbering 4 will be switched to UL subframe；Cause
This, configuration 3 is not belonging to the dynamic TDD configuration sets of configuration 1.Moreover, it has been noted that for current TDD configuration 1 when in the case of,
Eliminated be switched to set to 0 or 6 possibility, because if configuration 1 be switched to set to 0 with 6 in any one, then
UL HARQ will occur in the subframe for change into DL subframe, to cause traditional UE UL HARQ to disturb new UE HARQ.
For another example, Fig. 1 configuration 5 is observed.Because the configuration 5 in Fig. 1 all configurations has most DL
Frame, so would be impossible to make configuration 5 be switched to another match somebody with somebody in the case where not making at least one DL subframe be switched to UL subframe
Put.Therefore, the permission dynamic TDD configuration subsets for configuring 5 will only be configuration 5.Because those skilled in the art can be by abiding by
Follow above-mentioned principle and example to export the permission subset of other configurations, so will not be repeated again the derivation for other configurations.
Therefore, the form of table 3, which will be stored in, possesses new UE and new UE that dynamic TDD configured/reconfigured ability
In the memory of serving BS.When the TDD that new UE must be dynamically adjusted the need for base station is due to network traffics is configured,
Base station will be selected for new from corresponding to the permission dynamic TDD configuration sets for traditional UE each current TDD configurations
UE dynamic TDD configurations.For example, if the current TDD configurations for traditional UE are 3, then according to table 3, dynamic TDD matches somebody with somebody
It can only be configuration 3,4 or 5 to put.If the current TDD configurations for traditional UE are 0,5 or 6, then will not substantially allow dynamic
TDD is reconfigured, until current TDD configure changed into via the change in SI different current TDD configurations (for example with
Put 1,2,3 and 4) untill.
It should be noted that in alternative embodiments, instead of using the look-up table of storage in memory, in numeral or analog circuit
The determination logic of form can be used to determine whether a kind of dynamic TDD configurations belong to based on the current TDD as used in traditional UE
What is configured allows set.
Above-described embodiment will solve to measure the back compatible relevant with HARQ operation with the UE between tradition UE and new UE
Sex chromosome mosaicism.However, the switching at runtime of TDD configurations will also cause problem between new UE, reason with being used for as previously mentioned
New UE HARQ sequential logic mismatchs are relevant with the interruption of soft buffer management.Therefore, will be relative to general in order to solve described problem
The permission dynamic TDD configuration sets being described in detail below define UL HARQ timing references Ui, DL HARQ timing references DiWith it is every
The maximum number M of cell DL HARQ proceduresDL_HARQ.The solution can be expressed as series of steps by Fig. 3.
In step S501, it can be used and obtained by Fig. 2A, Fig. 2 B or Fig. 2 C and its correspondence written description technology described
For the permission dynamic TDD configuration sets of each possible TDD configurations, and a possible final result is illustrated that table 3 is opened up by table 3
Show the permission dynamic TDD configuration sets B that i is configured for TDDi, wherein, for LTE communication system for generally between 0 to 7
Integer；However, can be more than 7 in the case where that will change in future for Fig. 1 of LTE communication system predetermined TDD allocation lists
Any integer.Dynamic TDD configuration sets are allowed to be not limited to table 3, because can also be used for this by Fig. 2A or Fig. 2 B results produced
In individual step.
In step S502, it will determine to be used for the UL HARQ timing references configuration U that TDD configures ii.UL therefrom can be passed through
Subframe is BiIn every TDD configuration superset BiSelection TDD is configured and is determined UL HARQ timing references and configure Ui.If deposited
Configured in the multiple TDD for meeting aforementioned criteria, then will be the ginseng the TDD configuration selections of the UL subframe with minimal number
Examine configuration.In general, during the time cycle for TDD configurations i being configured in traditional UE, the UL HARQ for new UE
Sequential will comply with configures U for TDDiThe sequential of definition.
As an example it is assumed that the permission dynamic TDD configurations in the case of tradition UE has been configured for TDD configurations 1
Collection is combined into 1,2,4 and 5 (because table 3 illustrates BI=1=1,2,4,5), this will imply that new UE be possible to Fig. 1 TDD configuration
1st, switch between 2,4 and 5.According to Fig. 1, the UL subframe for configuring 1 is subframe 2,3,6,7 and 8.UL subframe for configuring 2
It is subframe 2,6 and 7.UL subframe for configuring 4 is subframe 2 and 3.UL subframe for configuring 5 is subframe 2.It should be noted that Fig. 1
Special subframe be counted as downlink subframe.In this example, it can be observed that configuration 1 uplink sub-frames 1,2,3,
6th, 7 and 8 be configuration 2,4 and 5 uplink sub-frames superset.In other words, the uplink sub-frames of configuration 2,4 and 5 are to match somebody with somebody
Put 1 subset.Therefore, configuration 1 will be selected to be UI=1When be used for UL HARQ timing references configure TDD configuration.This will meaning
When traditional UE has been configured for TDD configurations 1, the reference sequential for new UE UL HARQ operations will comply with such as Fig. 1
Shown in TDD configuration 1 reference sequential.Other TDD configurations during for i ≠ 1, refer to table 4 below, wherein the 3rd row from left to right
Illustrate implementation steps S502 final result.It should be noted that in this particular instance, UL-HARQ timing references configuration UiIt will pass through
Follow procedures S502 principle and follow for traditional UE current TDD configuration.
Table 4
In step S503, it will determine to be used for the DL HARQ timing references configuration that every TDD is configured.By selection wherein
DL subframe is BiIn every TDD configuration superset TDD configuration and find out for DL HARQ refer to TDD configure Di.If
Configured in the presence of the multiple TDD for meeting aforementioned criteria, then will be DL the TDD configuration selections of the DL subframe with minimal number
HARQ reference configurations.In general, during tradition UE is configured as TDD configurations i time cycle wherein, for new UE's
DL HARQ sequential will comply with configures the sequential that Di is defined for TDD.
As an example it is assumed that the permission dynamic TDD configurations in the case of tradition UE has been configured for TDD configurations 3
Collection is combined into 3,4 and 5 (because table 3 illustrates BI=3=3,4,5), this will imply that new UE be possible to Fig. 1 TDD configure 3,4 and
Switch between 5.According to Fig. 1, the DL subframe for configuring 3 is subframe 0,1,5,6,7,8 and 9.DL subframe for configuring 4 is son
Frame 0,1,4,5,6,7,8 and 9.DL subframe for configuring 5 is subframe 0,1,3,4,5,6,7,8 and 9.It should be noted that special subframe
It has been counted as downlink subframe.In the case of DL, it can be observed from Fig. 1, configuration 5 has most in all TDD configurations
Downlink subframe.Therefore, the downlink subframe 0,1,3,4,5,6,7,8 and 9 of configuration 5 is the downlink of configuration 3 and 4
The superset of subframe.In other words, the uplink sub-frames of configuration 3 and 4 are the subsets of configuration 5.Therefore, configuration 5 will be selected to be UI=1
When be used for UL HARQ timing references configure TDD configuration.This will imply that when tradition UE has been configured for TDD configurations 5
When, the reference sequential for new UE DL HARQ operations will comply with the reference sequential of TDD configurations 5 as shown in Figure 1.It is right
Other TDD configurations when i ≠ 3, refer to table 4, wherein secondary series illustrates implementation steps S503 final result from right to left.
In step S504, the M for new UE will be determined for every TDD configurations iDL_HARQParameter.In general, may be used
Configured and predefined M based on the TDD for being chosen for DL HARQ DiDL_HARQParameter is determined for new UE's
MDL_HARQParameter.In other words, the soft buffer setting for new UE will comply with as defined in the secondary series from right to left in table 4
The setting of DL HARQ timing references configuration.As an example it is assumed that the TDD configurations for traditional UE have been configured as configuration 1, then
According to table 4, for DI=1The timing reference configuration of selection will be TDD configurations 5.Because according to table 2,5 are configured for TDD
MDL_HARQParameter is 15, thus be accordingly used in the new UE soft buffer settings of DL HARQ or MDL_HARQTo be 15.Moreover, because
DI=2,3,4,5All it is 15, thus be accordingly used in the M of i=2,3,4,5DL_HARQParameter is all 15.In addition, because according to table 2, matching somebody with somebody for TDD
Set to 0 the M with 7DL_HARQParameter is 4 and 6 respectively, therefore the M for new UE as i=0 and 7DL_HARQBy respectively 4 and 6.
According to one exemplary embodiment, the result shown in table 4 can be known for new UE and base station, such as by table 4
The look-up table that is stored as in storage media uses analog or digital circuit implementation table 4 so that when new UE receives dynamic TDD
Configure/when reconfiguring signaling command, UE, which is possible to configure i based on the current TDD for being configured for traditional UE, knows correspondence Bi、
Ui、DiAnd MDL_HARQParameter is without additional signaling overhead.Look-up table is not limited to table 4.For another example, by following Fig. 2 B
Principle to select Bi, as i=0 and B0During={ 0,1,2,3,4,5,6 }, D0To be 5 and MDL_HARQIt will be 15, and work as i=
6 and B6During={ 1,2,3,4,5,6 }, D6To be 5 and MDL_HARQTo be 15.
Fig. 4 illustrates the dynamic TDD configuration mechanisms disclosed in the angle from base station according to an exemplary embodiment of the invention.
In step s 701, base station will use processor to be selected according to current traffic demand from predetermined TDD configuration sets (such as Fig. 1)
Select current TDD configurations.Current TDD configurations will be compatible with traditional UE and can obtained from system information block.In step S702, UE
Processor will be used after current TDD configurations are sent via transmitter based on the current TDD configurations selection dynamic TDD to match somebody with somebody
Put.
In step S703, base station will determine that DL-HARQ timing references are configured from predetermined TDD configuration sets.When determining DL
The criterion of sequence reference configuration is, the downlink subframe of DL-HARQ timing references configuration is that dynamic TDD configurations allow set
The superset of every TDD configurations.It is determined that the criterion for allowing set of dynamic TDD configurations is current from the selection of predetermined TDD configuration sets
The downlink subframe of TDD configurations configures the TDD that is possible to for not reconfiguring to uplink sub-frames.Optionally in step
In S705, UE will be from the selection UL-HARQ timing reference configurations of predetermined TDD configuration sets.Determine the configuration of UL-HARQ timing references
Criterion is that the uplink sub-frames of UL-HARQ timing references configuration are the every TDD configurations for allowing to gather of dynamic TDD configurations
Superset.
In step S704, base station will be implemented by following by the reference sequential of DL-HARQ timing reference configuration definitions
HARQ procedure.Optionally in step S706, base station will determine M by following the configuration of DL-HARQ timing referencesDL_HARQ。
Fig. 5 is to illustrate the dynamic TDD configuration mechanisms disclosed in the angle from UE according to an exemplary embodiment of the invention.
In step S801, UE will receive current TDD configurations from predetermined TDD configuration sets.Current TDD configurations will it is compatible with traditional UE simultaneously
And can be obtained from system information block.In step S802, UE will be after current TDD configurations be received via receiver based on described
Current TDD configurations receive dynamic TDD configurations.
In step S803, UE will determine that DL-HARQ timing references are configured from predetermined TDD configuration sets.Determine DL-HARQ
The criterion of timing reference configuration is, the downlink subframe of DL-HARQ timing references configuration is that dynamic TDD configuration allows set
Every TDD configuration superset.It is determined that the criterion for allowing set of dynamic TDD configurations is worked as from the selection of predetermined TDD configuration sets
The downlink subframe of preceding TDD configurations configures the TDD that is possible to for not reconfiguring to uplink sub-frames.Optionally in step
In rapid S805, UE will be from the selection UL-HARQ timing reference configurations of predetermined TDD configuration sets.Determine that UL-HARQ timing references are configured
Criterion be that the uplink sub-frames of UL-HARQ timing references configuration are that the every TDD for allowing set of dynamic TDD configuration matches somebody with somebody
The superset put.
In step S804, UE will be implemented by following by the reference sequential of DL-HARQ timing reference configuration definitions
HARQ procedure.Optionally in step S806, UE will determine M by following the configuration of DL-HARQ timing referencesDL_HARQ。
In addition, will determine to be used for the aperiodicity channel status reporting timing reference configuration C that TDD configures ii.Can by from
UL subframe is BiIn every TDD configuration superset BiWhen selection TDD is configured and is determined the aperiodicity channel status reporting
Sequence reference configuration Ci.Configured if there is the multiple TDD for meeting aforementioned criteria, then by the UL subframe with minimal number
TDD configuration selections are the reference configuration.
Specifically, the sequential of aperiodicity channel status reporting is similar to the sequential in UL-HARQ programs.Therefore, it is non-
Periodic channel state report timing reference configuration can be identical with UL-HARQ timing reference configurations.
In view of foregoing description, the present invention is suitable to use in a wireless communication system, and can be with will be with traditional UE
The mode of (before LTE is the 12nd edition) back compatible for new UE (LTE the 12nd edition or its after version) dynamically configuration or
Reconfigure TDD DL-UL configurations.Also, new UE can not be associated with HARQ sequential mismatch problem and HARQ is soft
In the case of the unexpected interference of buffer setting, dynamically switch in different time division duplex configurations.
In the present invention, the keyword or term of 3GPP classes are used only as example the inventive concept according to the present invention is presented；
However, the same concept presented in the present invention can be applied to any other system by those skilled in the art, such as
IEEE802.11, IEEE802.16, WiMAX etc..
Base station in the present invention can also include 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), family eNB, grand base
Stand (macro base station), femto base station (pico base station), femto base station (femto base
Station), access point, Home eNodeB, relay station, transponder, intermediate node, middle and/or satellite-based communication base station.
From hardware point, base station can turn comprising at least (but not limited to) transmitter circuit, acceptor circuit, analog (A/D)
Parallel operation, D/A (D/A) converter, process circuit, one or more antenna elements, and the storage media optionally selected.
Transmitter and receiver wirelessly send down link signal and receive uplink signal.Receiver can be included and held
The function element of row operation such as low noise amplification, impedance matching, mixing, frequency reducing, filtering, amplification.Transmitter can be included and held
The function element of row operation such as amplification, impedance matching, mixing, raising frequency, filtering, power amplification.Analog (A/D) or D/A
(D/A) converter be configured to uplink signal processing during from analog signal format be converted to digital signals format and
During down link signal processing analog signal format is converted to from digital signals format.
Process circuit is configured to handle data signal in an exemplary embodiment of the invention and performs proposed side
Mechanism, function, program or the method and step of method.Moreover, process circuit can optionally be couple to memory circuitry to store programming
Code, device configuration, code book (codebook), buffered data or permanent data etc..Example can be used in the function of process circuit
Such as microprocessor, microcontroller, dsp chip, FPGA programmable units are implemented.The function of process circuit also can use independent electricity
Sub-device or IC are implemented, and process circuit also can use hardware or software implementation.
In the present invention, term " user equipment " (UE) can represent various embodiments, and its (such as) can be comprising (but not limiting
In) movement station, advanced movement 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, pager, camera, TV, hand-held
Video game apparatus, music apparatus, wireless senser etc..In some applications, UE can be such as bus, train,
The stationary computer device operated in the mobile environment such as aircraft, ship, automobile.
From hardware point, UE can include at least (but not limited to) transmitter circuit, acceptor circuit, analog (A/D) conversion
Device, D/A (D/A) converter, process circuit, one or more antenna elements, and the memory circuitry optionally selected.
Memory circuitry can store programming code, device configuration, buffered data or permanent data, code book etc..Process circuit may be used also
With hardware or software implementation, and mechanism, function, program and the method and step that will be considered as implementing embodiments of the invention.UE
Each element be functionally similar to control node and therefore will not repeat detailed description to each element.
It is should not be construed as the element in the detailed description of the disclosed embodiment of the present invention, action or instruction to this hair
Be for bright definitely it is crucial or necessary, unless explicitly described.Moreover, as used herein, word " one " can be wrapped
Containing more than one project.If being intended to mean that only one project, then term " single " or similar language will be used.In addition, such as this
Used in text, wish to include institute in the term " in any one " before the list of multiple projects and/or multiple project kinds
State project and/or project kind individually or combine other projects and/or other project kinds " in any one ", " in appoint
What is combined ", " in any number of " and/or " in multiple any combinations ".In addition, as used herein, term " collection
Close " wish to include any quantity project, include zero.In addition, as used herein, term " quantity " is wished comprising any
Quantity, includes zero.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.In addition, unless specifically stated, otherwise claims should not be considered limited to described order or element.
Claims (14)
1. a kind of communication system of the duplexing configuration mechanism of use dynamic Time Division, it is characterised in that including：
Module for selecting current time division duplex configuration from predetermined time division duplex configuration set；
For double based on the current time division duplex configuration selection dynamic Time Division after the current time division duplex configuration is sent
The module of work configuration；
Module for determining the configuration of downlink hybrid automatic request timing reference from the predetermined time division duplex configuration set,
Wherein, the downlink subframe of the downlink hybrid automatic request timing reference configuration is permitting for dynamic Time Division duplex configuration
Perhaps gather each time division duplex configuration superset, wherein, dynamic Time Division duplex configuration it is described allow set include one or
More than one possible time division duplex configuration, wherein each downlink subframe of the current time division duplex configuration is not selected from institute
Stating allows the dynamic Time Division duplex configuration of set to be reconfigured for uplink sub-frames；And
For implementing mixing automatically by following the reference sequential of the downlink hybrid automatic request timing reference configuration
The module of repeat request process.
2. communication system according to claim 1, wherein described allow set to further comprise that one or more can
Can time division duplex configuration, wherein current time division duplex configuration is assigned to the every of mixed automatic repeat request up-link
One subframe is not selected from the dynamic Time Division duplex configuration for allowing set and is reconfigured for downlink subframe.
3. communication system according to claim 1, in addition to：
For the module from the predetermined time division duplex configuration set selection up-link hybrid automatic request timing reference configuration,
Wherein, the uplink sub-frames of the up-link hybrid automatic request timing reference configuration are the institutes of dynamic Time Division duplex configuration
State the superset for each time division duplex configuration for allowing set.
4. communication system according to claim 1, the maximum number of wherein downlink hybrid automatic request is to be based on institute
State the configuration of downlink hybrid automatic request timing reference and define.
5. communication system according to claim 1, in addition to for being via the mechanism compatible with legacy User Equipment
The module of the current time division duplex configuration is sent in system block of information.
6. communication system according to claim 1, if wherein the current time division duplex is configured to 0 or 6, then described
The configuration of downlink hybrid automatic request timing reference is respectively 0 or 6.
7. communication system according to claim 6, if wherein the current time division duplex is configured to 1,2,3,4 or 5, that
The downlink hybrid automatic request timing reference is configured to 5.
8. communication system according to claim 3, wherein up-link hybrid automatic request timing reference configuration with
The current time division duplex configuration is identical.
9. communication system according to claim 3, wherein aperiodicity channel status reporting timing reference configure with it is described
The configuration of up-link hybrid automatic request timing reference is identical.
10. communication system according to claim 4, if wherein the current time division duplex is configured to 1,2,3,4 or 5,
The maximum number of so described downlink hybrid automatic request is 15.
11. a kind of communication means of the communication system described in application claim 1, it is characterised in that including：
When current time division duplex is configured to 1,2,3,4 or 5, a downlink hybrid automatic request timing reference is configured to 5.
12. communication means according to claim 11, in addition to：
The configuration of up-link hybrid automatic request timing reference is identical with the current time division duplex configuration.
13. communication means according to claim 11, in addition to：
Aperiodicity channel status reporting timing reference is configured configures phase with the up-link hybrid automatic request timing reference
Together.
14. communication means according to claim 11, in addition to：
When current time division duplex is configured to 1,2,3,4 or 5, the maximum number of downlink hybrid automatic request is 15.
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| 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 | 2014-03-28 | ||
| US14/228,267 US9755816B2 (en) | 2013-03-28 | 2014-03-28 | Dynamic TDD configuration method and a base station using the same |
| US14/267,908 | 2014-05-01 | ||
| US14/267,908 US9503248B2 (en) | 2013-03-28 | 2014-05-01 | User equipment and base station using dynamic TDD configuration mechanism |
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| Title |
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| Fast uplink-downlink re-configuration with traffic adaptation by PHY layer signaling;SHARP;《3GPP R1-112300，XP050537442》;20110826;全文 * |
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