CN104936235A - Method of supporting double connections in wireless communication system and equipment thereof - Google Patents
Method of supporting double connections in wireless communication system and equipment thereof Download PDFInfo
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Abstract
The invention provides a method of supporting double connections in a wireless communication system and equipment thereof. The method comprises the step of executing one or more motions at user equipment so as to process previous transmission of an old special cell under the condition that the old special cell is changed into a new special cell. By using the method and the equipment of the invention, the previous transmission on the old special cell can be effectively processed.
Description
Technical field
Disclosure relate generally to wireless communication system.More specifically, the disclosure relates to the method and apparatus in the wireless communication system supporting dual link.
Background technology
According to 3GPP Release12(" R12 ") specification, " dual link " (" dualconnectivity " or be reduced to " DC ") refers to that subscriber equipment (" UE ") will keep being connected with macro base station (" MeNB ") and small base station (" SeNB ") in wireless communications simultaneously, wherein macro base station can provide a main plot (" Pcell ") and small base station can provide one or more auxiliary community (" Scell "), as shown in Figure 1.According to the current RAN2 about dual link, there is the particular cell (SPcell) that is configured for SeNB.During this SPcell life cycle, it will remain on state of activation and primary responsibility is used for physical uplink control channel (" the PUCCH ") transmission of subscriber equipment.In same SeNB, SPcell not remains unchanged but can change, such as, when SPcell generation occasional service overload or when being temporarily in poor wireless transmission environments.In this case, this SPcell or be called that another Scell that old SPcell will convert conventional Scell and SeNB to will be configured to new SPcell to continue the transmission of PUCCH, and this transfer process to be namely SPcell change process.
Although the Pcell based on (" the HO ") process of switching that 3GPP Rel10/11 has defined in carrier aggregation (" CA ") changes, this Pcell changes process can not be used for SPcell change.In Rel10/11CA, Pcell is responsible for many items, such as mobile management and radio jink failure (" RLF ") etc., and therefore HO process is deferred in Pcell change.But in 3GPP R12DC, SPcell only comprises PUCCH transmission and therefore the change of SPcell can be considered to similar with reshuffling of lower layer protocol parameter in mode.In other words, SPcell changes and changes the identical mode of process by not taking with the Pcell defined in Rel10/11.
Therefore, the solution about the precedent transmission how processed on old SPcell is needed.
Summary of the invention
In order to some technical problems mentioned above solving, an aspect of the present disclosure provides a kind of method supporting to use in the cordless communication network of the dual link of subscriber equipment and macro base station and small base station, wherein said small base station at least comprises a particular cell of the physical uplink control channel transmission being configured for described subscriber equipment, described method is included in and occurs from old particular cell to the change of new particular cell, perform one or more action at described subscriber equipment place to process the precedent transmission of described old particular cell.
In one embodiment, the one or more actions wherein performed at described subscriber equipment place relate to the uplink synchronization state of described old particular cell.
In one embodiment, the method comprises stopping timing advance timer further and determines that the uplink synchronisation of described old particular cell is invalid.
In another embodiment, described method comprises the state checking timing advance timer further, in response to described timing advance timer still in operation, determines that the uplink synchronisation of described old particular cell is effective; And to stop in particular cell change process in response to described timing advance timer or to expire, determine that the uplink synchronisation of described old particular cell is invalid.
In another execution mode, described method comprises further in response to completing particular cell reconfiguration course, restarts timing advance timer and determines that the uplink synchronisation of described old particular cell is effective.
In one embodiment, described method comprises further based on the instruction from base station to timing advance timer executable operations, to determine that the uplink synchronisation of described old particular cell is effective or invalid based on described operation.
In another embodiment, the one or more actions wherein performed at described subscriber equipment place relate to the activation relative to described subscriber equipment or the deactivation status of described old particular cell.
In yet, described method comprises further and determines that described old particular cell is in described state of activation relative to described subscriber equipment and starts community packet data inactivity timer.
In one embodiment, described method comprises further and determines that described old particular cell is in described deactivation status relative to described subscriber equipment.
In yet, described method comprises further and determines that described old particular cell is in described activation or deactivation status relative to described subscriber equipment based on the instruction from base station.
In one embodiment, the one or more actions wherein performed at described subscriber equipment place relate to the previous downlink transmission of described old particular cell.
In yet, wherein said old particular cell is in state of activation relative to described subscriber equipment, described method comprise further following in one: be released in ongoing DL HARQ process on described old particular cell and discharge all relevant DL HARQ buffers; Keep described DL HARQ process and relevant buffer until corresponding downlink transmission is correctly received; After particular cell change process, receive downlink scheduling signaling in response on described old particular cell, the information of the downlink transmission newly received and buffering is merged; And after particular cell change process, receiving new downlink transmission in response to from described small base station, release comes from the information of the buffering of described old particular cell.
In another embodiment, wherein said old particular cell is in deactivation status relative to described subscriber equipment, and described method comprises all DL HARQ buffers and down link hybrid automatic repeat request processes that discharge for described old particular cell further; And wait for that described small base station dispatches new transmission.
In yet, the one or more actions wherein performed at described subscriber equipment place relate to the previous uplink transmission of described old particular cell.
In another embodiment, wherein said previous uplink transmission comprises up link uplink control information transmission, described method comprise further following in one: in response to the uplink random access procedure completed on described new particular cell, trigger the described up link uplink control information transmission on described old particular cell; In response to the uplink random access procedure completed on described old particular cell, trigger the described up link uplink control information transmission on described old particular cell, wherein said uplink random access procedure is used for the uplink synchronisation between described subscriber equipment and described small base station; In response to the up link uplink control information transmission on described new particular cell, trigger the described up link uplink control information transmission on described old particular cell; Receive first dispatch in response on described new particular cell, trigger the described up link uplink control information transmission on described old particular cell; In response to receiving dispatch or in response to the dispatch received about described old particular cell, trigger the described up link uplink control information transmission on described old particular cell on described old particular cell; And in response to receiving the instruction coming from base station and transmit in medium access control control unit, trigger the described up link uplink control information transmission on described old particular cell.
In one embodiment, wherein said previous uplink transmission comprises up link upstream data information transmission, and described old particular cell is in state of activation, described method comprise further following in one: discharge all ongoing uplink hybrid automatic repeat request process relevant to described old particular cell and uplink hybrid automatic repeat request buffer; And suspend all ongoing uplink hybrid automatic repeat request process relevant to described old particular cell and all uplink hybrid automatic repeat request buffers retained for the uplink hybrid automatic repeat request process receiving Negative Acknowledgement, one of so that below performing: in response to being successfully linked into described new particular cell, restart the ul transmissions on described old particular cell; In response to successfully receiving the first dispatch from described new particular cell, the non-self-adapting restarted on described old particular cell retransmits; Receive first uplink signalling in response on described old particular cell, restart the uplink hybrid automatic repeat request process of all time-outs on described old particular cell; In response to the uplink random access procedure completed on described old particular cell, trigger the described up link upstream data information transmission on described old particular cell, wherein said uplink random access procedure is used for the uplink synchronisation between described subscriber equipment and described small base station; And in response to receiving the uplink signalling be associated with the uplink hybrid automatic repeat request process suspended on described old particular cell, restart the uplink hybrid automatic repeat request process of the described time-out on described old particular cell.
In another embodiment, wherein in from described old particular cell to the change process of described new particular cell, described method comprises the described old particular cell of release.Here, described release movement can be such as in particular cell (radio resource control RRC) change process, subscriber equipment carries out corresponding action based on receiving the instruction coming from small base station, such as subscriber equipment discharges old particular cell according to instruction, or according to indicating the particular cell keeping this old, namely do not discharge this old particular cell.
In yet, the described old particular cell of described release comprises following at least one item: discharge all up link ascending control informations relevant to described old particular cell and configure; Discharge all upstream or downstream hybrid automatic repeat request processes relevant to described old particular cell; And all upstream or downstream mixed automatic repeat request buffers that release is relevant to described old particular cell.
In one embodiment, wherein said previous uplink transmission comprises up link upstream data information transmission, and described old particular cell is in unactivated state, described method comprises the release all ongoing uplink hybrid automatic repeat request process relevant to described old particular cell and uplink hybrid automatic repeat request buffer further.
Another aspect of the present disclosure provides a kind of equipment supporting to use in the cordless communication network of the dual link of subscriber equipment and macro base station and small base station, wherein said small base station at least comprises a particular cell of the physical uplink control channel transmission being configured for described subscriber equipment, described equipment comprises: performance element, for when occurring from old particular cell to the change of new particular cell, perform one or more action at described subscriber equipment place to process the precedent transmission of described old particular cell.
Another aspect of the present disclosure provides a kind of subscriber equipment for performing said method.
Utilize the method and apparatus according to many aspects of the present disclosure and execution mode, the problem of the precedent transmission how processing old particular cell under dual link framework can be solved well, possibility in further raising dual link wireless transmission and reliability, and also improve efficiency of transmission.
Accompanying drawing explanation
According to the detailed description of the illustrative embodiments below in conjunction with accompanying drawing, above and other object of the present disclosure, Characteristics and advantages will become obvious, in the accompanying drawings:
Fig. 1 is the diagram of the dual link framework schematically shown according to disclosure execution mode;
Fig. 2 schematically shows the sequential chart that the UL control information (" UCI ") that automatically restarts on old SPcell according to the subscriber equipment of disclosure execution mode transmits;
Fig. 3 schematically shows the diagram being used to indicate medium education (" the MAC ") control unit (" CE ") of subscriber equipment execution UCI transmission according to disclosure execution mode;
Fig. 4 schematically shows to restart the sequential chart of the UL transmission of subscriber equipment on old SPcell according to the message 2 or 4 that utilizes of disclosure execution mode;
Fig. 5 is the sequential chart that the first dispatch of utilization on new SPcell (such as, scheduling grant (" grant ")) schematically shown according to disclosure execution mode restarts the UL transmission on old SPcell;
Fig. 6 schematically shows the sequential chart that the first scheduling grant received on old SPcell according to the utilization of disclosure execution mode restarts the UL transmission on old SPcell;
Fig. 7 schematically shows the sequential chart that the corresponding scheduling grant received on old SPcell according to the utilization of disclosure execution mode restarts corresponding UL hybrid automatic repeat-request (" the HARQ ") process on old SPcell;
Fig. 8 is the flow chart of the method schematically shown according to disclosure execution mode; And
Fig. 9 is the block diagram of the equipment used in the wireless communication system of support dual link schematically shown according to disclosure execution mode.
Embodiment
The disclosure proposes the multiple solutions about the precedent transmission how processing old SPcell in multiple illustrative embodiments.Particularly, the disclosure proposes to be used for changing at SPcell four kinds of execution modes that process completes the UL synchronous regime of the old SPcell of reprocessing, three kinds of execution modes that process completes the activation/deactivation state of the old SPcell of reprocessing are changed at SPcell, UE code of conduct/solution that previous down link (" DL ") transmits is processed according to old SPcell activation/deactivation state, how automatically to restart the UL UCI(" UCI " on old SPcell) transmit and guarantee the five kinds of synchronous execution modes between SeNB and UE in this type of ULUCI transmission, and how to process five kinds of execution modes synchronous between SeNB and UE when previous UL physical uplink link shared channels (" PUSCH ") transmits and guarantees the automatic UL PUSCH transmission on old SPcell.
As previously mentioned, after SPcell change process, old SPcell has been transformed into a conventional Scell.In the modified Cheng Qian of this SPcell, the SPcell that this is old certainly exists UL transmission, such as UL PUSCH(such as UL HARQ process transmission) transmission, UL UCI transmission, such as UL detection reference signal (" SRS "), UL CQI (" CQI "), precoding matrix indicators (" PMI ") and order instruction (" RI ") transmit etc.In addition, due to before SPcell reconfiguration course, this old SPcell is always in state of activation, and therefore packet data inactivity timer sCellDeactivationTimer in community does not run.Given this, the disclosure it is also proposed about the corelation behaviour of UE after SPcell reconfiguration course suitably to process the precedent transmission of old SPcell.
In a word, after completing SPcell change process, for old SPcell, the disclosure is intended to the problem at least solved below:
Problem 1: up (UL) synchronous (" the SYN ") state how processing old SPcell;
How problem 2: after UE side completes SPcell change process, process or determine the activation/deactivation state of old SPcell; And
Problem 3: the previous UL/DL transfer of data and the ULUCI transmission that how to process old SPcell.
problem 1. processes the solution of old SPcell UL SYN
In order to ensure after SPcell change process correctly and suitably carry out UL transmission, should identify or determine the UL SYN state of old SPcell, correctly to guide the subsequent operation of UE on old SPcell.For this reason, the disclosure proposes four illustrative embodiments below, and it will cause different UE behaviors:
Execution mode 1: when SPcell has configured, UE stops timing advance timer (" TAT ") and then the UL synchronous regime of old SPcell is considered as invalid, namely thinks UE and old SPcell uplink asynchronous;
Execution mode 2:SPcell changes process does not affect the current TAT timer run, and UE will check this timer state after its side completes SPcell change process, and
if TAT still in operation, then confirms UE and old SPcell uplink synchronous;
alternatively, if TAT stops/expires during SPcell reconfiguration course, then UE and old SPcell UL are synchronously regarded as invalid, namely determine that UE and old SPcell is up and asynchronous.
Execution mode 3: complete after SPcell reshuffles, UE restart TAT timer and confirm UE up with old SPcell be synchronous;
Execution mode 4:SeNB controls to increase extra instruction in (" RRC ") message at the radio resource that MeNB transmits to UE, to indicate UE to perform corresponding action, such as, stops TAT timer or keeps this timer or restart timer etc.
According to the execution mode of the above-mentioned discussion of the disclosure, for execution mode 1, change after process completes at SPcell, if for the TAT timer of old SPcell still in operation, then UE will stop this timer and think that old SPcell UL synchronous regime is by no longer valid.Then, UE will not perform any UL transmission until obtain new timing advance (" TA ") on this old SPcell.Such as, be in identical timing advance group (" TAG ") if this old SPcell is in new SPcell, then UE thinks that the UL of this new SPcell is also synchronously invalid.For this reason, before starting any UL transmission on new SPcell, UE is by synchronous with the UL of new SPcell for execution.Correspondingly, if it is synchronous to obtain new UL at new SPcell, such as based on the up PRACH process of competing or the up PRACH process exempting from competition, then the UL synchronous regime of UE on old SPcell also will automatically restart, thus UL transmission can restart.On the other hand, if old SPcell is in the TAG different from new SPcell, then after SPcell change process, SeNB will know that the uplink synchronous of UE at old SPcell is invalid.For this reason, SeNB will trigger new uplink random access procedure (or being called up PRACH process in this application) on old SPcell, synchronous with the UL of old SPcell to obtain, thus can restart the UL transmission on old SPcell.
In R10/R11, when being triggered Pcell by HO process and changing process, the TAT timer of all TAG of source eNB all will be released.Comparatively speaking, for the execution mode 2 that the disclosure is advised, its SPcell changes the TAT operation that process does not affect old SPcell.That is, when UE side joint receives SPcell change order, UE can not stop or discharging this timer as defined in R10.On the contrary, the TAT timer of the SPcell that UE military order is old continues to run.After UE side completes SPcell change process, UE will check TAT state:
if TAT timer is still in operation, then UE thinks that old SPcell UL is synchronous still effective.If old SPcell is in the TAG identical with new SPcell, then UE will think that with the uplink synchronous of new SPcell be also effective.Therefore, there is no need on new SPcell, perform up PRACH process, unless SeNB requires that UE does like this;
if TAT timer expires during SPcell change process, then UE can think that it is synchronous with the UL of old SPcell no longer valid.Now, SeNB can detect this situation based on the corresponding TAT timer state of himself and determine that UE is synchronously invalid at the UL of old SPcell.Then, SeNB or can trigger UE and performs the up PRACH process on old SPcell, or makes UE decide when to regain synchronous with the UL of old SPcell based on the PRACH process of competing.
For execution mode 3, after completing SPcell change process, no matter old the TAT timer what state of SPcell, UE will restart the TAT timer of old SPcell.Then, the uplink sync status on old SPcell can be determined.In SeNB side, if uplink sync status on old SPcell detected and bad, such as based on the subsequent upstream transmission on old SPcell, then SeNB by the up PRACH process on old SPcell of triggering again to improve UE and old SPcell UL synchronous regime.From this point, execution mode 3 is for realizing UE and old SPcell uplink synchronous is very effective.
Can comprise by changing RRC information at SPcell behavior or the action that instruction carrys out control UE for execution mode 4, SeNB.Such as, after SPcell change process, SeNB can indicate UE to perform the new up PRACH process on old SPcell.Then, in UE side, UE will to determine or to know that the UL of old SPcell has synchronously been regarded as invalid.Therefore, UE can not perform any UL transmission on old SPcell, until regain synchronous with the UL on old SPcell.On the other hand, SeNB also can require that UE runs to keep TAT, and then changes after process completes at SPcell, can perform in UE side as in execution mode 2 the operation rules that defines.
In a word, four execution modes that the disclosure is above-mentioned proposed can cause or obtain different UE behaviors, and also ensure that the operation of UE on old SPcell can be performed correctly.
how problem 2. processes the activation/deactivation state of old SPcell
Specify according to current R12DC, SPcell always will be in state of activation, therefore during the life cycle of SPcell, should not there is the community packet data inactivity timer (" CellDeactivationTimer ") of operation.Then, this old SPcell converts a conventional Scell to.And for a conventional Scell, it should have different activation/deactivation states, and should have timer CellDeactivationTimer to be associated with this old SPcell.
In view of above-mentioned, disclosure suggestion three execution modes below process the activation/deactivation state how processing old SPcell after SPcell process change:
Execution mode 1: keep old SPcell to be state of activation;
Execution mode 2: keep old SPcell to be deactivation status; And
Execution mode 3: based on the SeNB be included in SPcell change RRC information
Order determine SPcell be in activation or deactivation status.
For execution mode 1, after SPcell change process completes, old SPcell will be considered to be in state of activation.But, should " activation " state be only temporarily " activation ", and be different from previous " always state of activation ".Then, after completing SPcell change process, when old SPcell is considered to state of activation, UE automatically should start corresponding sCellDeactivationTimer timer.At this timer to after date, UE will think that the state of activation relative to this UE of this old SPcell should be stopped and then automatically enter into unactivated state.Can find out, this brand-new UE behavior can be considered to the mode based on being run the RRC information triggered by timer sCellDeactivationTimer.
For execution mode 2, after UE completes SPcell change process, old SPcell will be considered to be in unactivated state.Then, UE should discharge all corresponding mixed automatic repeat request (" HARQ ") process, thus causes loss of data and follow-up redundant retransmission.This execution mode uses SPcell to change RRC information and triggers the old SPcell of UE deexcitation, therefore can be regarded as the Scell deactivating operation that RRC triggers, and this does not specify in R10/R11.Because in previous version, activate or deexcitation be controlled by medium access control (" MAC ") control unit (" CE ") but not controlled by RRC process.
To change to the instruction made new advances in RRC information at SPcell, to guide UE behavior for execution mode 3, SeNB.Such as, if it is deexcitation that SeNB indicates UE to be remained by old SPcell relative to described UE, then UE should perform the new operation of definition in execution mode 1.On the other hand, if the SPcell that SeNB order UE deexcitation is old, then UE will perform the new operation defined in execution mode 2.
In a word, that no matter takes in above-mentioned three kinds of execution modes is any, and UE will guarantee that it performs correctly suitable operation after completing SPcell change process.
how problem 3. processes the previous DL transmission of old SPcell
This problem relates to for after SPcell change process, for old SPcell activation/deactivation state, namely takes which execution mode in problem 2:
SeNB in execution mode 1 in problem 2 or execution mode 3 is provided in RRC information to the situation of state of activation instruction, after SPcell change process completes, old SPcell will remain on state of activation.For this situation, present disclosure proposes UE behavior/operation below:
UE safeguards continuing and suspends the ongoing DLHARQ process on old SPcell;
Further, UE continues to keep corresponding DL harq buffer device, until data are correctly received;
UE waits for the further DL dispatch (such as permitting (" grant ")) of SeNB to restart or to be released in these the DLHARQ processes suspended on this old SPcell;
After SPcell change process, UE will restart the DL transmission of the SeNB detected on old SPcell automatically, thus UE knows the DL HARQ process of the time-out how processed on old SPcell.Such as,
if by sending relevant DL to UE on old SPcell, SeNB permits that performing DL HARQ retransmits, then the DL recently received transmits to the information combination cushioned in corresponding buffer to transmit by UE;
on the other hand, if the DL that UE receives as new transmission permits, then UE will be released in the information cushioned in corresponding harq buffer device, and the DL received transmission is considered as new transmission.
Alternatively, if take the execution mode 2 in problem 2, or take the execution mode 3 in problem 2 but SeNB requires the SPcell that UE deexcitation is old, then UE will all DL harq buffer devices of release and wait for that SeNB dispatches new transmission.
In a word, based on each execution mode that the disclosure is above-mentioned, the previous DL transmission can finding out on old SPcell will change after process completes at SPcell and will be treated correctly.
how problem 4. processes the previous UL transmission of old SPcell
As mentioned above, in the modified Cheng Qian of SPcell, old SPcell exists UL transmission certainly, such as physical uplink link sharing information (" PUSCH "), PUCCH and UL UCI transmission, comprise SRS, CQI/PMI/RI feedback etc.Then, change after process completes at SPcell, need to determine if process existing UL HARQ operation, how and when to restart UE and automatically perform UL UCI transmission etc.These problems also relate in problem 2 and problem 1 taking which execution mode.
Described in problem 2, when taking execution mode 2, the SPcell that the RRC process trigger deactivation that SPcell changes is old, UE are by all previous UL HARQ operation of release, and stop all ongoing UL UCI transmission, and do not consider the UL synchronous regime of old SPcell.
On the other hand, if take the execution mode 1 in problem 3, namely after SPcell change process, old SPcell will keep state of activation, then need to determine if the UL UCI processed on old SPcell and UL HARQ process, as discussed below.In order to simplified characterization, suppose that the UL of SPcell old after SPcell change process synchronously will keep.Otherwise, after the UL restarting old SPcell is synchronous, will execution mode below be considered:
how problem 4.1 restarts UL UCI transmission after SPcell change process
For UL transmission, crucial problem is, when UE will perform UL transmission, must guarantee that eNB and UE is synchronous, thus the UL that eNB can receive from UE to transmit.In R10/R11, such as the UL UCI transmission of UL SRS/PMI/RI/CQI etc. is configured by RRC information.Then, eNB will know when UE will perform these UL and transmit, such as, reshuffled message based on UL RRC information.But in R12DC scene, this strategy is by no longer valid, because RRC agreement is only positioned at MeNB side, and SeNB does not know when MeNB receives RRC and reshuffled message.That is, SeNB is difficult to know when these automatic UL UCI transmission will start, and therefore SeNB is difficult to and unlikely on old SPcell, receives UL UCI transmission.In order to solve this problem, the disclosure proposes execution mode below:
Triggering UE is restarted the UL UCI transmission on old SPcell when completing up PRACH process on new SPcell by execution mode 1:UE.Similarly, UE also can perform up PRACH process and triggers the UL UCI transmission restarted on old SPcell according to completing on old SPcell;
When execution mode 2:UE starts to carry out UL UCI transmission on new SPcell, triggering UE is restarted on old SPcell the UL UCI transmission of automation;
Execution mode 3: will the UL UCI transmission of UE on old SPcell be triggered when receiving first dispatch (such as, permitting) on new SPcell.That is, triggering UE is restarted UL UCI transmission by the transfer of data first on new SPcell on old SPcell;
Execution mode 4: receive dispatch or receive when indicating the dispatch of old SPcell transmission triggering UE to come to perform UL UCI transmission at old SPcell on old SPcell.That is, triggering is restarted UL UCI transmission by the transfer of data first on old SPcell on old SPcell;
Execution mode 5: design new MAC CE, thus SeNB can ask UE to perform the UL UCI transmission on old SPcell by this MAC CE;
Execution mode 6: indicate UE to perform UL UCI transmission on old SPcell by the activation/deactivation MAC CE coming from SeNB.For this execution mode, no matter which kind of state old SPcell is in, if SeNB wishes that UE starts UL UCI transmission on old SPcell, then SeNB will send the activation/deactivation MAC CE of instruction " activation " state downwards.And at UE side place, when receiving this first MAC CE, UE will automatically restart the UL UCI transmission on old SPcell.This execution mode is similar to the execution mode 5 that wherein UE behavior is controlled by SeNB, but difference is that execution mode 6 employs activation/deactivation MAC CE for this purpose.
For execution mode 1, the time point when UE completes the up PRACH process on new SPcell is by for the UL UCI transmission of synchronous UE and SeNB on old SPcell.Such as, for the PRACH process avoiding competing, after transmission message 2, SeNB knows that UE restarts to perform UL UCI transmission on old SPcell by after certain time period (such as 4 milliseconds).And in UE side, after receive message 2 on new SPcell, UE restarts to perform UL UCI transmission on old SPcell by after certain time period (such as 4 milliseconds).Again such as, for the PRACH process based on competition, the transmission of message 4 is used as the synchronous UL UCI transmission of UE and SeNB on old SPcell of time point.That is, after receiving message 4, UE restarts UL UCI transmission by after 4 milliseconds on old SPcell, shown by the execution mode 1 in Fig. 2.
For execution mode 2, when UE starts to perform the UL UCI transmission on new SPcell, no matter be by which kind of execution mode triggered, UE will automatically start to carry out its UL UCI transmission on old SPcell, and this it will be appreciated that when UE will start the UL UCI transmission on new SPcell for SeNB.Then, execution mode 2, SeNB also will be known when UE will start the UL UCI transmission on old SPcell.That is, synchronous in the UL UCI transmission of UE and SeNB on old SPcell.This synchronization scenario can see the execution mode 2 shown in Fig. 2.
For execution mode 3, when UE receives dispatch on new SPcell, UE will utilize this reception as time point to restart its UL UCI transmission on old SPcell.Reason be SeNB know UE when on new SPcell receiving scheduling signaling and therefore SeNB will know that when UE will start its UL UCI transmission on old SPcell.That is, the reception of the dispatch on new SPcell is used as synchronous UE and SeNB to perform UL UCI transmission at old SPcell.See shown in the execution mode 3 in Fig. 2, new SPcell receives 4 milliseconds after first PDCCH, and UE performs UL UCI transmission by old SPcell.
For execution mode 4, when receiving dispatch on old SPcell or receive indicate transmit on old SPcell dispatch time, UE will restart its UL UCI transmission on old SPcell.Reason and execution mode 3 similar because SeNB knows when will receive the dispatch being directed to old SPcell and therefore SeNB also should know when UE will restart the UL UCI transmission on old SPcell.See shown by the execution mode 4 in Fig. 2,4 milliseconds after the first PDCCH that old SPcell receives, UE carries out UL UCI transmission by old SPcell.
Above-mentioned execution mode 1-4 relates to the automatism of UE, and difference is that each execution mode has different UL UCI transmission and triggers benchmark or reference.However, SeNB also can order UE to perform UL UCI transmission, as execution mode 5 advise.This is similar to R10, and wherein UL UCI transmission is triggered by RRC process.That is, can think that R10/R11UL UCI transmission is asked based on RRC process by eNB.Comparatively speaking, in R12DC, owing to not having RRC agreement at SeNB place, disclosure suggestion SeNB carrys out order UE by MAC CE and restarts the UL UCI transmission on old SPcell.For this reason, the disclosure proposes a kind of new MAC CE, and this MAC CE has fairly simple form.Such as, this MAC CE only comprises MAC CE sub-header and is not followed by MAC CE payload (data division), and sub-header is only a byte, i.e. R/R/E/LCID, as in Fig. 3 shown by last point, the Logic Channel Identifier (" LCID ") that wherein definition one is new, is used to indicate UE and will performs UL UCI transmission.Alternatively, as in Fig. 3 shown by next part, can comprise the MAC CE payload of a byte at this MAC CE, its instruction UE should perform UL UCI transmission on which community.Which is effective and simple, because there is MAC entity in SeNB.By above-mentioned execution mode, the disclosure can obtain as in R10/R11 by RRC information to trigger the identical performance of UL UCI transmission.
For execution mode 6, SeNB activation/deactivation MAC CE for triggering UE to restart the UL UCI transmission on old SPcell.Therefore, the present disclosure defines new UE behavior: after completing SPcell change process, first activation/deactivation MAC CE will trigger UE and perform UL UCI transmission.
In a word, above-mentioned execution mode 1-6 restarts UL UCI transmission for guiding UE on old SPcell is feasible.Especially, execution mode 5 ensure that UE and SeNB Complete Synchronization in ensuing UL UCI transmission, thus reaches the performance similar with R10/R11.
how problem 4.2 restarts UL PUSCH transmission after SPcell change process
As noted above, another major issue changes after process completes how to process the previous ongoing UL PUSCH transmission (that is, transfer of data) on old SPcell at SPcell.This problem is with after performing SPcell change process, and the execution mode how processing UL synchronous on old SPcell in problem 1 is relevant, and the execution mode of the activation/deactivation state how processing old SPcell in problem 2 is relevant.If take the execution mode 2 in problem 2 or take execution mode 3 but the SPcell asking deexcitation old by SeNB, then UE should discharge all ongoing UL HARQ processes and also discharge all relevant harq buffer device information.
On the other hand, if think that old SPcell is in state of activation after SPcell change process, then the disclosure suggestion operation performed below processes and perform previous ongoing UL PUSCH on old SPcell.The UL that discussion below confirms UE and old SPcell based on hypothesis is synchronous.
Execution mode 1: although after SPcell change process completes, old SPcell is retained as state of activation, UE is by UL harq buffer devices all with release for all ongoing ULHARQ processes of release;
Execution mode 2:UE maintains and suspends all ongoing UL HARQ processes.In addition, UE will keep all UL harq buffer devices being directed to the HARQ process receiving NACK before this.After the UL PRACH process that UE successfully completes on new SPcell, UE automatically will restart UL transmission (non-self-adapting HARQ retransmits) on old SPcell;
Execution mode 3: be similar to execution mode 2, UE and maintain and suspend all ongoing UL HARQ processes.In addition, UE will keep all UL harq buffer devices being directed to the HARQ process receiving NACK before this.Successfully complete after new SPcell receives first dispatch at UE, the UL non-self-adapting automatically restarted on old SPcell retransmits by UE;
Execution mode 4: be similar to execution mode 2, UE and maintain and suspend all ongoing UL HARQ processes.In addition, UE will keep all UL harq buffer devices being directed to the HARQ process receiving NACK before this.But be different from execution mode 2, UE and should wait for the further UL dispatch coming from SeNB, to restart UL retransmitting or discharge these UL harq buffer devices preserved.That is, the first UL dispatch old SPcell received will restart the UL HARQ process operation of all time-outs of UE.
Execution mode 5: being similar to execution mode 2, UE will keep being directed to all UL harq buffer devices of the HARQ process of previously received NACK.But be different from execution mode 2, UE and should wait for the further UL dispatch coming from SeNB, retransmit to restart UL or discharge corresponding ULHARQ buffer.That is, the UL dispatch old SPcell received only will restart corresponding UL HARQ process operation.If do not receive corresponding UL dispatch, then UE should continue the HARQ process suspending other.
For execution mode 1, after completing SPcell change process, even if old SPcell is still in state of activation, UE discharges all ongoing UL harq buffer devices.Therefore, this execution mode will cause unnecessary redundant retransmission but have the advantage of relative simplicity.
For execution mode 2, safeguard UL harq buffer device and ongoing UL HARQ process.After UE completes up PRACH process on new SPcell, by the UL HARQ process for those previously received NACK, the non-self-adapting UL HARQ automatically started on old SPcell retransmits UE.For this execution mode, the reception of message 2 or message 4 will be used as the time point of the UL transmission of synchronous SeNB and UE on old SPcell, as shown in Figure 4.
For execution mode 3, it is similar to execution mode 2, and difference is when receiving first dispatch on new SPcell, and UE retransmits restarting its UL non-self-adapting HARQ on old SPcell.That is, the first dispatch on new SPcell will be used as the time point of the UL HARQ re-transmission of synchronous SeNB and UE on old SPcell, as shown in Figure 5.
Its UL HARQ operation will not be restarted, until receive first dispatch on old SPcell for execution mode 4, UE.For this execution mode, only a dispatch will restart the UL HARQ process of all current hang.Such as, after UE performs corresponding UL HARQ transmission based on the UL license received in TTI i, permit even without receiving further UL, the UL HARQ continuing to perform non-self-adapting in follow-up TTI retransmits by UE, as shown in Figure 6.
For execution mode 5, UE by maintenance with safeguard all ongoing UL HARQ processes.UE can not restart the UL HARQ process suspended, until receive corresponding UL dispatch on old SPcell.That is, when receiving UL dispatch on old SPcell, UE will only restart corresponding UL HARQ process, but continue to keep other UL HARQ to suspend.This means that a UL dispatch only will restart a UL HARQ process, this is obviously different from execution mode 4.As shown in Figure 7, suppose that first dispatch is associated with UL HARQ process i, then the dispatch received by basis is performed adaptive re-transmission or performs new transmission by UE, and restarts ULHARQ process.In next TTI, owing to not receiving corresponding dispatch, continuation is suspended UL HARQ process i+1 by UE, as in figure indicated by " X ".In follow-up TTI, owing to again receiving dispatch, UE will restart UL HARQ process i+2 and the adaptive retransmission performed indicated by the dispatch received or new transmission further, and identical process is undertaken continuing.Should be understood that process here represents that i, i+1, i+2 or i+n etc. are only exemplary, and n can get suitable value according to the difference of original bench mark position.
In a word, execution mode 1-5 is feasible for the ULHARQ process restarting to suspend on old SPcell, because SeNB and UE synchronously should restart on the time point of UL transmission as UE on old SPcell.
Fig. 8 schematically shows the flow chart of the method 800 according to embodiment of the present disclosure.As previously mentioned, the method 800 uses in the cordless communication network of dual link supporting subscriber equipment and macro base station and small base station, exemplary wireless communications network as shown in Figure 1.As shown in Figure 8, method 800 starts from step S801, and proceed to step S802, at this step place, when occurring from old particular cell to the change of new particular cell, perform one or more action at described subscriber equipment place to process the precedent transmission of described old particular cell.Then, method 800 terminates in step S803 place.
In one embodiment, the one or more actions wherein performed at described subscriber equipment place relate to the UL synchronous regime of described old particular cell.
In one embodiment, the method 800 comprises the UL stopping timing advance timer and determine described old particular cell is further synchronously invalid.
In another embodiment, described method 800 comprises the state checking timing advance timer further, in response to described timing advance timer still in operation, determines that the UL of described old particular cell is synchronously effective; And to stop in particular cell change process in response to described timing advance timer or to expire, determine that the UL of described old particular cell is synchronously for invalid.
In another execution mode, described method 800 comprises further in response to completing particular cell reconfiguration course, restarts timing advance timer and determines that the UL of described old particular cell is synchronously effective.
In one embodiment, described method 800 comprises further based on the instruction from base station to timing advance timer executable operations, to determine that the UL of described old particular cell is synchronously for effective or invalid based on described operation.
In another embodiment, the one or more actions wherein performed at described subscriber equipment place relate to the activation relative to described subscriber equipment or the deactivation status of described old particular cell.
In yet, described method 800 comprises further and determines that described old particular cell is in described state of activation relative to described subscriber equipment and starts community packet data inactivity timer.
In one embodiment, described method 800 comprises further and determines that described old particular cell is in described deactivation status relative to described subscriber equipment.
In yet, described method 800 comprises further and determines that described old particular cell is in described activation or deactivation status relative to described subscriber equipment based on the instruction from base station.
In one embodiment, the one or more actions wherein performed at described subscriber equipment place relate to the previous downlink transmission of described old particular cell.
In yet, wherein said old particular cell is in state of activation relative to described subscriber equipment, described method comprise further following in one: be released in ongoing DL HARQ process on described old particular cell and discharge all relevant DL HARQ buffers; Keep described DL HARQ process and relevant buffer until corresponding downlink transmission is correctly received; After particular cell change process, receive downlink scheduling signaling in response on described old particular cell, the information of the downlink transmission newly received and buffering is merged; And after particular cell change process, receiving new downlink transmission in response to from described small base station, release comes from the information of the buffering of described old particular cell.
In another embodiment, wherein said old particular cell is in deactivation status relative to described subscriber equipment, and described method comprises all DL HARQ buffers and down link hybrid automatic repeat request processes that discharge for described old particular cell further; And wait for that described small base station dispatches new transmission.
In yet, the one or more actions wherein performed at described subscriber equipment place relate to the previous UL transmission of described old particular cell.
In another embodiment, wherein said previous UL transmission comprises UL UCI transmission, described method comprise further following in one: in response to the UL random access procedure completed on described new particular cell, trigger the described UL UCI transmission on described old particular cell; In response to the UL random access procedure completed on described old particular cell, trigger the described UL UCI transmission on described old particular cell, the UL that wherein said UL random access procedure is used between described subscriber equipment and described small base station is synchronous; In response to the UL UCI transmission on described new particular cell, trigger the described UL UCI transmission on described old particular cell; Receive first dispatch in response on described new particular cell, trigger the described UL UCI transmission on described old particular cell; In response to receiving dispatch or in response to the dispatch received about described old particular cell, trigger the described UL UCI transmission on described old particular cell on described old particular cell; And in response to receiving the instruction coming from base station and transmit in medium access control control unit, trigger the described UL UCI transmission on described old particular cell.
In one embodiment, wherein said previous UL transmission comprises UL upstream data information transmission, and described old particular cell is in state of activation, described method comprise further following in one: discharge all ongoing UL hybrid automatic repeat request process relevant to described old particular cell and UL hybrid automatic repeat-request buffer; And suspend all ongoing UL hybrid automatic repeat request process relevant to described old particular cell and all UL hybrid automatic repeat-request buffers retained for the UL hybrid automatic repeat request process receiving Negative Acknowledgement, one of so that below performing: in response to being successfully linked into described new particular cell, restart the UL transmission on described old particular cell; In response to successfully receiving the first dispatch from described new particular cell, the non-self-adapting restarted on described old particular cell retransmits; Receive first UL signaling in response on described old particular cell, restart the UL hybrid automatic repeat request process of all time-outs on described old particular cell; In response to the UL random access procedure completed on described old particular cell, trigger the described UL upstream data information transmission on described old particular cell, the UL that wherein said uplink random access procedure is used between described subscriber equipment and described small base station is synchronous; And in response to receiving the UL signaling be associated with the UL hybrid automatic repeat request process suspended on described old particular cell, restart the UL hybrid automatic repeat request process of the described time-out on described old particular cell.
In another embodiment, wherein in from described old particular cell to the change process of described new particular cell, described method comprises the described old particular cell of release.As previously mentioned, release here can be receive the instruction coming from small base station, thus subscriber equipment can discharge old particular cell according to this instruction.Additionally, subscriber equipment also can comply with the particular cell that this instruction keep this old.
In yet, the described old particular cell of described release comprises following at least one item: discharge all UL UCIs relevant to described old particular cell and configure; Discharge all upstream or downstream hybrid automatic repeat request processes relevant to described old particular cell; And all upstream or downstream mixed automatic repeat request buffers that release is relevant to described old particular cell.
In one embodiment, wherein said previous UL transmission comprises UL upstream data information transmission, and described old particular cell is in unactivated state, described method comprises the release all ongoing UL hybrid automatic repeat request process relevant to described old particular cell and UL hybrid automatic repeat-request buffer further.
Fig. 9 is the block diagram of the equipment 900 used in the wireless communication system of support dual link schematically shown according to disclosure execution mode.As previously mentioned, this equipment 900 is used in the cordless communication network of the dual link supporting subscriber equipment and macro base station and small base station, and wherein said small base station at least comprises a particular cell of the physics UL control channel transmission being configured for described subscriber equipment.As shown in Figure 9, described equipment 900 comprises: performance element 901, for when occurring from old particular cell to the change of new particular cell, perform one or more action at described subscriber equipment place to process the precedent transmission of described old particular cell.It should be understood that equipment 900 here can be implemented as subscriber equipment or its part, and can be configured to perform according to method 800 illustrated in fig. 8 and multiple execution mode thereof.That is, another aspect of the present disclosure provides a kind of UE for performing said method 800.
To sum up, by reference to the accompanying drawings each execution mode of the present disclosure is described in detail.It will be appreciated by those skilled in the art that embodiment of the present disclosure can be realized by hardware, software, firmware, module or its combination, also can embody the disclosure in computer program set on the signal bearing medium for any suitable data treatment system.This signal bearing medium can be transmission medium or the recordable media for machine sensible information, comprises magnetizing mediums, light medium or other suitable media.The example of recordable media comprises: the disk in hard disk drive or floppy disk, the CD for CD-ROM drive, tape, and those skilled in the art's other media thinkable.One skilled in the art would recognize that the suitable communication devices with suitable programmed device all can perform the step of the disclosure method as embodied in program product.
It should be noted that to make the disclosure be easier to understand, description above eliminates to be known for a person skilled in the art and may to be required some ins and outs more specifically for realization of the present disclosure.
Although disclosed particular implementation of the present disclosure, it will be appreciated by those skilled in the art that and can make a change for specific execution mode and spirit and scope of the present disclosure can not be departed from.Therefore, the disclosure is not limited to specific execution mode, and claims comprise any and all such application, amendment and execution mode within the scope of the disclosure.
Claims (21)
1. one kind in the method supporting to use in the cordless communication network of the dual link of subscriber equipment and macro base station and small base station, wherein said small base station at least comprises a particular cell of the physical uplink control channel transmission being configured for described subscriber equipment, and described method comprises:
When occurring from old particular cell to the change of new particular cell, perform one or more action at described subscriber equipment place to process the precedent transmission of described old particular cell.
2. method according to claim 1, the one or more actions wherein performed at described subscriber equipment place relate to the uplink synchronization state of described old particular cell.
3. method according to claim 2, comprises further:
Stop timing advance timer; And
Determine that the uplink synchronisation of described old particular cell is invalid.
4. method according to claim 2, comprises further:
Check the state of timing advance timer;
In response to described timing advance timer still in operation, determine that the uplink synchronisation of described old particular cell is effective; And
Stop in particular cell change process in response to described timing advance timer or expire, determining that the uplink synchronisation of described old particular cell is invalid.
5. method according to claim 2, comprises further:
In response to completing particular cell reconfiguration course, restarting timing advance timer and determining that the uplink synchronisation of described old particular cell is effective.
6. method according to claim 2, comprises further:
Based on the instruction from base station to timing advance timer executable operations, to determine that the uplink synchronisation of described old particular cell is effective or invalid based on described operation.
7. method according to claim 1, the one or more actions wherein performed at described subscriber equipment place relate to the activation relative to described subscriber equipment or the deactivation status of described old particular cell.
8. method according to claim 7, comprises further:
Determine that described old particular cell is in described state of activation relative to described subscriber equipment; And
Start community packet data inactivity timer.
9. method according to claim 7, comprises further:
Determine that described old particular cell is in described deactivation status relative to described subscriber equipment.
10. method according to claim 7, comprises further:
Determine that described old particular cell is in described activation or deactivation status relative to described subscriber equipment based on the instruction from base station.
11. methods according to claim 1, the one or more actions wherein performed at described subscriber equipment place relate to the previous downlink transmission of described old particular cell.
12. methods according to claim 11, wherein said old particular cell is in state of activation relative to described subscriber equipment, described method comprise further following in one:
Be released in ongoing DL HARQ process on described old particular cell and discharge all relevant DL HARQ buffers;
Keep described DL HARQ process and relevant buffer until corresponding downlink transmission is correctly received;
After particular cell change process, receive downlink scheduling signaling in response on described old particular cell, the information of the downlink transmission newly received and buffering is merged; And
After particular cell change process, receive new downlink transmission in response to from described small base station, release comes from the information of the buffering of described old particular cell.
13. methods according to claim 11, wherein said old particular cell is in deactivation status relative to described subscriber equipment, and described method comprises further:
Discharge all DL HARQ buffers for described old particular cell and down link hybrid automatic repeat request processes; And
Wait for that described small base station dispatches new transmission.
14. methods according to claim 1, the one or more actions wherein performed at described subscriber equipment place relate to the previous uplink transmission of described old particular cell.
15. methods according to claim 14, wherein said previous uplink transmission comprises up link uplink control information transmission, described method comprise further following in one:
In response to the uplink random access procedure completed on described new particular cell, trigger the described up link uplink control information transmission on described old particular cell;
In response to the uplink random access procedure completed on described old particular cell, trigger the described up link uplink control information transmission on described old particular cell, wherein said uplink random access procedure is used for the uplink synchronisation between described subscriber equipment and described small base station;
In response to the up link uplink control information transmission on described new particular cell, trigger the described up link uplink control information transmission on described old particular cell;
Receive first dispatch in response on described new particular cell, trigger the described up link uplink control information transmission on described old particular cell;
In response to receiving dispatch or in response to the dispatch received about described old particular cell, trigger the described up link uplink control information transmission on described old particular cell on described old particular cell; And
In response to receiving the instruction coming from base station and transmit in medium access control control unit, trigger the described up link uplink control information transmission on described old particular cell.
16. methods according to claim 14, wherein said previous uplink transmission comprises up link upstream data information transmission, and described old particular cell is in state of activation, described method comprise further following in one:
Discharge all ongoing uplink hybrid automatic repeat request process relevant to described old particular cell and uplink hybrid automatic repeat request buffer; And
One of suspend all ongoing uplink hybrid automatic repeat request process relevant to described old particular cell and all uplink hybrid automatic repeat request buffers retained for the uplink hybrid automatic repeat request process receiving Negative Acknowledgement, so that below performing:
In response to being successfully linked into described new particular cell, restart the ul transmissions on described old particular cell;
In response to successfully receiving the first dispatch from described new particular cell, the non-self-adapting restarted on described old particular cell retransmits;
Receive first uplink signalling in response on described old particular cell, restart the uplink hybrid automatic repeat request process of all time-outs on described old particular cell;
In response to the uplink random access procedure completed on described old particular cell, trigger the described up link upstream data information transmission on described old particular cell, wherein said uplink random access procedure is used for the uplink synchronisation between described subscriber equipment and described small base station; And
In response to receiving the uplink signalling be associated with the uplink hybrid automatic repeat request process suspended on described old particular cell, restart the uplink hybrid automatic repeat request process of the described time-out on described old particular cell.
17. methods according to claim 1, wherein in from described old particular cell to the change process of described new particular cell, described method comprises the described old particular cell of release.
18. methods according to claim 17, the described old particular cell of wherein said release comprises following at least one item:
Discharge all up link ascending control informations relevant to described old particular cell to configure;
Discharge all upstream or downstream hybrid automatic repeat request processes relevant to described old particular cell; And
Discharge all upstream or downstream mixed automatic repeat request buffers relevant to described old particular cell.
19. methods according to claim 14, wherein said previous uplink transmission comprises up link upstream data information transmission, and described old particular cell is in unactivated state, described method comprises the release all ongoing uplink hybrid automatic repeat request process relevant to described old particular cell and uplink hybrid automatic repeat request buffer further.
20. 1 kinds at the equipment supporting to use in the cordless communication network of the dual link of subscriber equipment and macro base station and small base station, wherein said small base station at least comprises a particular cell of the physical uplink control channel transmission being configured for described subscriber equipment, and described equipment comprises:
Performance element, for when occurring from old particular cell to the change of new particular cell, performs one or more action to process the precedent transmission of described old particular cell at described subscriber equipment place.
21. 1 kinds for performing the subscriber equipment of the method according to any one of claim 1-19.
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