CN102932854A - Method and device for switching transmission modes - Google Patents
Method and device for switching transmission modes Download PDFInfo
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- CN102932854A CN102932854A CN2011102260654A CN201110226065A CN102932854A CN 102932854 A CN102932854 A CN 102932854A CN 2011102260654 A CN2011102260654 A CN 2011102260654A CN 201110226065 A CN201110226065 A CN 201110226065A CN 102932854 A CN102932854 A CN 102932854A
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Abstract
The invention discloses a method and a device for switching transmission modes. The method comprises the steps of: determining to carry out switching on the transmission modes by an MAC (Media Access Control); sending a transmission mode switching request to an RRC (Radio Resource Control), wherein the transmission mode switching request is used for requesting the RRC to carry out transmission mode reassortment on UE (User Equipment); and carrying out the transmission mode switching by the MAC according to a reassortment completion notice from the RRC, wherein the reassortment completion notice is used for indicating the completion of the reassortment of the transmission modes of the UE.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of transmission mode switching method and device.
Background technology
Defined 8 kinds of downlink patterns in Long Term Evolution (Long-Term Evolution is referred to as LTE) Release 9 agreements, wherein transmission mode (Transmission Mode is referred to as TM) 1 is single port port0 emission; TM2 is diversity mode; The main transmission plan of TM3 is the large Cyclic Delay Diversity (Cyclic Delay Diversity is referred to as CDD) that postpones; The main transmission plan of TM4 is Closed-Loop Spatial Multiplexing; The main transmission plan of TM5 is MU-MlMO; TM6 is the individual layer precoding; The main transmission plan of TM7 is single current beam shaping (Beamforming is referred to as BF), namely adopts single port port5 emission; TM8 supports double-current BF, namely adopts port7 and port8 emission, comprises in addition single current BF, namely adopts port7 or port8 emission.Need to prove that TM3～TM8 inside except main transmission plan, also comprises the transmit diversity transmission plan.Table 1 has provided transmission plan and corresponding Downlink Control Information (Downlink Control Information is referred to as DCI) form thereof that different transmission mode comprises.
The transmission plan that each transmission mode of table 1 comprises and corresponding DCI form thereof
In the environment of reality, can be according to different scenes and the adaptive selection transmission mode of channel condition, thus obtain best user's throughput and improve power system capacity.In the LTE system, subscriber equipment (User Equipment, referred to as UE) switching between transmission mode needs mutual Radio Resource control (Radio Resource Control, referred to as RRC) signaling, namely when UE switches to another kind of transmission mode from a kind of transmission mode, need to carry out reprovision to the transmission mode of this UE by RRC, after the UE reprovision was finished, new transmission mode just can come into force.
But, not yet define the switching that how to trigger between transmission mode in the correlation technique.
Summary of the invention
How to trigger the problem of the switching between transmission mode and propose the present invention for not yet defining in the correlation technique, for this reason, main purpose of the present invention is to provide a kind of transmission mode switching method and device, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of transmission mode switching method.
Transmission mode switching method according to the present invention comprises: MAC determines to carry out the switching of transmission mode; MAC sends the transmission mode handover request to RRC, and wherein the transmission mode handover request is used for request RRC carries out transmission mode to UE reprovision; MAC carries out the switching of transmission mode according to finish notice from the reprovision of RRC, and wherein reprovision is finished and notified the reprovision of the transmission mode that is used to indicate UE to finish.
Preferably, after MAC determined to carry out the switching of transmission mode, said method also comprised: adopt the scheduling of DCI1A transmit diversity between MAC and the UE.
Preferably, before MAC sent the transmission mode handover request to RRC, said method also comprised: judge whether exist non-DCI1A to retransmit between MAC and the UE; If judged result is yes, wait for then that non-DCI1A retransmits to adopt after this non-DCI1A retransmits, carry out again the operation that sends the transmission mode handover request, otherwise the directly operation of execution transmission transmission mode handover request.
Preferably, after MAC sends the transmission mode handover request to RRC, said method also comprises: MAC does not receive RRC to the response of described transmission mode handover request within the predefined time, and wherein RRC comprises that to the response of described transmission mode handover request RRC accepts described transmission mode handover request or RRC does not accept described transmission mode handover request; Keep former transmission mode between MAC and the UE.
Preferably, after RRC sent the transmission mode handover request, said method also comprises: MAC received the first reprovision failure notification from RRC, and wherein the first reprovision failure notification is used to indicate RRC and does not accept the transmission mode handover request at MAC; Keep former transmission mode between MAC and the UE.
Preferably, after MAC sends the transmission mode handover request to RRC, said method also comprises: MAC receives the second reprovision failure notification from RRC, and it is overtime that wherein the second reprovision failure notification is used to indicate reprovision failure or the RRC transmission mode reprovision of transmission mode of UE; Keep former transmission mode between MAC and the UE.
Preferably, according to finishing from the reprovision of RRC after notice carries out the switching of transmission mode, said method also comprises at MAC: MAC start-up period timer, wherein periodical timer is used for triggering MAC and determines whether again to carry out the judgement that transmission mode is switched.
To achieve these goals, according to a further aspect of the invention, provide a kind of transmission mode switching device shifter.
Transmission mode switching device shifter according to the present invention is applied to MAC, comprising: determination module is used for determining to carry out the switching of transmission mode; Sending module is used for sending the transmission mode handover request to radio resource control RRC, and wherein the transmission mode handover request is used for request RRC carries out transmission mode to user equipment (UE) reprovision; Handover module is used for carrying out the switching of transmission mode according to finish notice from the reprovision of RRC, and wherein reprovision is finished and notified the reprovision of the transmission mode that is used to indicate UE to finish.
Preferably, said apparatus also comprises: processing module, be used for and UE between adopt the scheduling of DCI1A transmit diversity.
Preferably, said apparatus also comprises: judge module is used for judging whether exist non-DCI1A to retransmit between MAC and the UE; Retransmission module is used in the situation that judged result is yes, non-DCI1A is retransmitted adopt this non-DCI1A to retransmit; Scheduler module is used for sending the transmission mode handover request after non-DCI 1A retransmits again.
The present invention sends the transmission mode handover request by MAC and triggers switching between transmission mode, and then finish notice by MAC according to reprovision and carry out the switching of transmission mode, thereby the problems referred to above have been solved, and can improve the synchronism of transmission mode between MAC and the UE, reduce the asynchronous packet loss that causes of transmission mode.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the transmission mode switching method of the embodiment of the invention;
Fig. 2 is the flow chart of transmission mode switching method according to the preferred embodiment of the invention;
Fig. 3 is the structured flowchart according to the transmission mode switching device shifter of the embodiment of the invention;
Fig. 4 is the structured flowchart one of according to the preferred embodiment of the invention transmission mode switching device shifter;
Fig. 5 is the structured flowchart two of according to the preferred embodiment of the invention transmission mode switching device shifter.
Embodiment
Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
The invention provides a kind of transmission mode switching method.Fig. 1 is the flow chart according to the transmission mode switching method of the embodiment of the invention, as shown in Figure 1, comprises that following step S102 is to step S106.
Step S102, MAC determine to carry out the switching of transmission mode.
Step S104, MAC sends the transmission mode handover request to RRC, and wherein the transmission mode handover request is used for request RRC carries out transmission mode to UE reprovision.
Step S106, MAC carries out the switching of transmission mode according to finish notice from the reprovision of RRC, and wherein reprovision is finished and is notified the reprovision of the transmission mode that is used to indicate UE to finish.
In the correlation technique, not yet how definition triggers the switching between transmission mode.In the embodiment of the invention, MAC sends the transmission mode handover request and triggers switching between transmission mode, and then MAC finishes notice according to reprovision and carries out the switching of transmission mode, thereby the problems referred to above have been solved, and can improve the synchronism of transmission mode between MAC and the UE, reduce the asynchronous packet loss that causes of transmission mode.
Preferably, after MAC determined to carry out the switching of transmission mode, said method also comprised: adopt the scheduling of DCI1A transmit diversity between MAC and the UE.
Consider that all transmission modes between MAC and the UE all support DCI 1A, this preferred embodiment has carried out conservative processing to transmission mode in the reciprocal process of transmission mode hand off signaling, namely adopts the scheduling of DCI1A transmit diversity.Like this, can guarantee in the reciprocal process of transmission mode hand off signaling, the transmission between MAC and the UE can be because of the not inconsistent of transmission mode packet loss, thereby can improve the reliability of transmission.
In addition, the DCI1A transmit diversity scheduling of adopting between MAC and the UE can last till that receiving the UE reprovision finishes before the notice.
Preferably, before MAC sent the transmission mode handover request to RRC, said method also comprised: judge whether exist non-DCI1A to retransmit between MAC and the UE; If judged result is yes, wait for then that non-DCI1A retransmits to adopt after this non-DCI1A retransmits, carry out again the operation that sends the transmission mode handover request, otherwise the directly operation of execution transmission transmission mode handover request.
Consider and to exist non-DCI1A to retransmit between MAC and the UE, this preferred embodiment has been postponed to RRC and has been sent the transmission mode handover request, namely before sending the transmission mode handover request, still adopt this non-DCI1A to retransmit for non-DCI1A re-transmission, then adopt DCI1A to transmit for new biography.Like this, that both can avoid that non-DCI1A retransmits in the reciprocal process of transmission mode hand off signaling loses, can guarantee again transmission between MAC and the UE can be because of the not inconsistent of transmission mode packet loss, thereby can further improve the reliability of transmission.
Be in for a long time uncertain state for fear of the transmission mode between MAC and the UE, thereby improve the reliability of transmission, the present invention also provides three kinds of processing modes, to finish as early as possible this uncertain state.Be described in greater detail below in conjunction with example 1 to example 3.
Example 1:MAC arranges the protection timer, if MAC does not receive that RRC to the response of described transmission mode handover request, then keeps former transmission mode within the time of this protection timer indication.
This example 1 consider RRC may because of busy have little time to process the transmission mode handover request and to described transmission mode handover request without any response; wait for that RRC feeds back reprovision and finishes in the process of notice thereby cause MAC to be in for a long time; this preferred embodiment can be according to predefined set of time protection timer; if should protect timer expiry, then MAC will finish waiting process and enter normal processes.Like this, can avoid the transmission mode between MAC and the UE to be in for a long time uncertain state, thereby improve the reliability of transmission.
Example 2:MAC receives the first reprovision failure notification from RRC, and wherein the first reprovision failure notification is used to indicate RRC and does not accept the transmission mode handover request; Keep former transmission mode between MAC and the UE.
This example 2 considers that RRC is owing to the reason of configuration may not accepted the transmission mode handover request, in this preferred embodiment when MAC receives that RRC does not accept reprovision failure notification that the transmission mode handover request causes, meeting end as early as possible is because the uncertain state of the transmission mode that causes alternately of transmission mode hand off signaling, keep the original transmission mode of this UE, enter normal flow process.
Example 3:MAC receives the second reprovision failure notification from RRC, and it is overtime that wherein the second reprovision failure notification is used to indicate reprovision failure or the RRC transmission mode reprovision of transmission mode of UE; MAC and RRC carry out abnormality processing.
Consider that UE might unsuccessfully or owing to DCCH loses cause RRC transmission mode reprovision overtime by reprovision, be UE reprovision failure for the first situation, UE can initiate to rebulid connection request, namely again initiates random access, and this moment, MAC also can enter random access procedure; Namely to lose the RRC transmission mode reprovision that causes overtime owing to DCCH for the second situation, this moment, RRC can't determine also UE whether finish by reprovision, RRC tackles this situation and does abnormality processing, and as again the UE transmission mode being carried out reprovision, MAC can temporarily keep original transmission mode constant.
And then above-mentioned example 1 to example 3 can also be used in combination mutually, to realize the complete preservation to MAC.Wherein, when example 1 during as composite component, if MAC receives above-mentioned the first reprovision failure notification, MAC can also stop this protection timer, finishes hand off signaling reciprocal process between transmission mode.
Preferably, according to finishing from the reprovision of RRC after notice carries out the switching of transmission mode, said method also comprises at MAC: MAC start-up period timer, wherein periodical timer is used for triggering MAC and determines whether again to carry out the judgement that transmission mode is switched.
Consider the unsteadiness of the status transmission between MAC and the UE, periodically determine whether again to carry out the judgement that transmission mode is switched by MAC in this preferred embodiment, thereby can guarantee that MAC and UE are according to different scenes and channel condition, select as far as possible the transmission mode be more suitable for, and then obtain best user's throughput and improve power system capacity.
Be described in detail below in conjunction with the implementation procedure of preferred embodiment to the embodiment of the invention.
This preferred embodiment has been described transmission mode switching method.Suppose that transmission mode switches the employing cycle and judge, this cycle judges to adopt periodical timer T1timer and initial value is set and is T1, and wherein the value of T1 is generally second grade.The protection timer is T3timer and initial value is set is T3, and wherein the value of T3 need to be processed time of transmission mode handover request and RRC and MAC interactive interfacing time according to RRC and determines.
Fig. 2 is the flow chart of transmission mode switching method according to the preferred embodiment of the invention, as shown in Figure 2, comprises that following step S202 is to step S212.
S202, the MAC judgement need to be carried out switching between pattern.Wherein, if MAC judgement transmission mode is compared with original transmission mode do not change, namely do not need to switch, then flow process finishes.
S204, MAC reports TM handover request (being above-mentioned transmission mode handover request) to RRC.
Preferably, before reporting, MAC can judge whether this UE exists non-DCI1A retransmission process.If there is no, then directly report the TM handover request to RRC, and starting protection timer T3timer=T3; If exist; then need MAC to postpone and report the TM handover request to RRC; finish just to report the TM handover request to RRC until wait for all non-DCI1A retransmission process of this UE; and while starting protection timer T3timer=T3, all new biographies of this UE all adopt the DCI1A scheduling in waiting for the complete process of non-DCI1A re-transmission.
S206, RRC sends RRC reprovision signaling to UE.
Preferably, before RRC sends RRC reprovision signaling, can not accept above-mentioned TM handover request if RRC judges, then tell to the failure of MAC transmission mode reprovision by interface, and process ends.
S208, UE sends the RRC reprovision to RRC and finishes signaling.
S210, RRC informs that by interface the MAC reprovision finishes, then the new transmission mode of base station end this moment comes into force.
Need to prove, before RRC informed, MAC can wait for the interface notice of RRC always.And then before RRC informed, also there were following several possibilities in MAC.
1) begins the transmission mode of UE is carried out the notice (being the TM handover request notice that RRC accepts MAC) of reprovision if MAC has received RRC, can stop protecting timer T3timer.
2) if MAC has received the transmission mode reprovision failure notification of RRC, then keep original transmission mode, switch the reprovision signalling interactive process between pattern and finish, carry out normal flow process.
3) transmission mode of UE is carried out the notice of reprovision if MAC waits for RRC always, until T3timer is overtime, then hand off signaling reciprocal process finishes between pattern, enters normal flow process.
Preferably, after MAC reports the TM handover request to RRC, until receiving the TM reprovision of RRC, finishes between notice day MAC, and can the scheduling of mandatory adoption DCI1A transmit diversity for the new biography of this UE.
S212 is restarted T1timer=T1, and the initialization relevant information.
Need to prove, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
The embodiment of the invention provides a kind of transmission mode switching device shifter, and this transmission mode switching device shifter can be applied to MAC, and is used for realizing above-mentioned transmission mode switching method.Fig. 3 is the structured flowchart according to the transmission mode switching device shifter of the embodiment of the invention, as shown in Figure 3, comprises determination module 31, sending module 32 and handover module 33.The below is described in detail its structure.
Determination module 31 is used for determining to carry out the switching of transmission mode; Sending module 32 is connected to determination module 31, is used for sending the transmission mode handover request to RRC, and wherein the transmission mode handover request is used for request RRC carries out transmission mode to UE reprovision; Handover module 33 is connected to sending module 32, is used for carrying out the switching of transmission mode according to finish notice from the reprovision of RRC, and wherein reprovision is finished and notified the reprovision of the transmission mode that is used to indicate UE to finish.
In the correlation technique, not yet how definition triggers the switching between transmission mode.In the embodiment of the invention, sending module 32 sends the transmission mode handover request and triggers switching between transmission mode, and then handover module 33 is finished notice according to reprovision and is carried out the switching of transmission mode, thereby the problems referred to above have been solved, and can improve the synchronism of transmission mode between MAC and the UE, reduce the asynchronous packet loss that causes.
Fig. 4 is the structured flowchart one of according to the preferred embodiment of the invention transmission mode switching device shifter, and as shown in Figure 4, said apparatus also comprises: processing module 34, be connected to determination module 31, be used for and UE between adopt the scheduling of DCI1A transmit diversity.
Consider that all transmission modes between MAC and the UE all support DCI 1A, this preferred embodiment has carried out conservative processing to transmission mode in the reciprocal process of transmission mode hand off signaling, namely adopts processing module 34 to carry out the scheduling of DCI1A transmit diversity.Like this, can guarantee in the reciprocal process of transmission mode hand off signaling, the transmission between MAC and the UE can be because of the not inconsistent of transmission mode packet loss, thereby can improve the reliability of transmission.
Fig. 5 is the structured flowchart two of according to the preferred embodiment of the invention transmission mode switching device shifter, and as shown in Figure 5, said apparatus also comprises judge module 35, retransmission module 36 and scheduler module 37, and the below is described in detail its structure.
Whether judge module 35 is connected to determination module 31, be used for judging existing non-DCI1A to retransmit between MAC and the UE; Retransmission module 36 is connected to judge module 35, and the judged result that is used at judge module 35 is in the situation that is, non-DCI1A is retransmitted adopt this non-DCI1A to retransmit; Scheduler module 37 is connected to sending module 32 and retransmission module 36, is used for sending the transmission mode handover request after non-DCI1A retransmits again.
Consider and to exist non-DCI1A to retransmit between MAC and the UE, this preferred embodiment has been postponed to RRC and has been sent the transmission mode handover request, namely before sending the transmission mode handover request, still adopt these non-DCI1A to retransmit by retransmission module 36 for non-DCI 1A re-transmission, then adopt DCI1A to transmit for new biography.Like this, that both can avoid that non-DCI1A retransmits in the reciprocal process of transmission mode hand off signaling loses, can guarantee again transmission between MAC and the UE can be because of the not inconsistent of transmission mode packet loss, thereby can further improve the reliability of transmission.
Need to prove, the transmission mode switching device shifter of describing among the device embodiment is corresponding to above-mentioned embodiment of the method, and its concrete implementation procedure had been carried out detailed description in embodiment of the method, do not repeat them here.
In sum, according to the abovementioned embodiments of the present invention, a kind of transmission mode switching method and device are provided.The present invention sends the transmission mode handover request by MAC and triggers switching between transmission mode, and then finish notice by MAC according to reprovision and carry out the switching of transmission mode, how definition triggers the problem of the switching between transmission mode thereby can solve in the correlation technique not yet, and can guarantee transmission mode between MAC and the UE synchronously.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a transmission mode switching method is characterized in that, comprising:
Media access control MAC determines to carry out the switching of transmission mode;
Described MAC sends the transmission mode handover request to radio resource control RRC, and wherein said transmission mode handover request is used for asking described RRC user equipment (UE) to be carried out the reprovision of described transmission mode;
Described MAC carries out the switching of described transmission mode according to finish notice from the reprovision of described RRC, and wherein said reprovision is finished and notified the reprovision of the described transmission mode that is used to indicate described UE to finish.
2. method according to claim 1 is characterized in that, after MAC determined to carry out the switching of transmission mode, described method also comprised: adopt the scheduling of descending control information format DCI1A transmit diversity between described MAC and the described UE.
3. method according to claim 2 is characterized in that, before described MAC sent the transmission mode handover request to RRC, described method also comprised:
Judge whether exist non-DCI1A to retransmit between described MAC and the described UE;
If judged result is yes, wait for then that described non-DCI1A retransmits to adopt after this non-DCI1A retransmits, carry out again the operation that sends described transmission mode handover request, otherwise the directly operation of the described transmission mode handover request of execution transmission.
4. method according to claim 1 is characterized in that, after RRC sent the transmission mode handover request, described method also comprised at described MAC:
Described MAC does not receive described RRC to the response of described transmission mode handover request within the predefined time, wherein said RRC comprises that to the response of described transmission mode handover request described RRC accepts described transmission mode handover request or described RRC does not accept described transmission mode handover request;
Keep former transmission mode between described MAC and the described UE.
5. method according to claim 1 is characterized in that, after RRC sent the transmission mode handover request, described method also comprised at described MAC:
Described MAC receives the first reprovision failure notification from described RRC, and wherein said the first reprovision failure notification is used to indicate described RRC and does not accept described transmission mode handover request;
Keep former transmission mode between described MAC and the described UE.
6. method according to claim 1 is characterized in that, after RRC sent the transmission mode handover request, described method also comprised at described MAC:
Described MAC receives the second reprovision failure notification from described RRC, and it is overtime that wherein said the second reprovision failure notification is used to indicate the transmission mode reprovision of the reprovision failure of described transmission mode of described UE or described RRC;
Keep former transmission mode between described MAC and the described UE.
7. each described method in 6 according to claim 1, it is characterized in that, at described MAC according to finishing from the reprovision of described RRC after notice carries out the switching of described transmission mode, described method also comprises: described MAC start-up period timer, wherein said periodical timer are used for triggering described MAC and determine whether again to carry out the judgement that transmission mode is switched.
8. a transmission mode switching device shifter is applied to media access control MAC, it is characterized in that, comprising:
Determination module is used for determining to carry out the switching of transmission mode;
Sending module is used for sending the transmission mode handover request to radio resource control RRC, and wherein said transmission mode handover request is used for asking described RRC user equipment (UE) to be carried out the reprovision of described transmission mode;
Handover module is used for carrying out the switching of described transmission mode according to finish notice from the reprovision of described RRC, and wherein said reprovision is finished and notified the reprovision of the described transmission mode that is used to indicate described UE to finish.
9. device according to claim 8 is characterized in that, also comprises: processing module, be used for and described UE between adopt the scheduling of descending control information format DCI1A transmit diversity.
10. device according to claim 9 is characterized in that, also comprises:
Judge module is used for judging whether exist non-DCI1A to retransmit between described MAC and the described UE;
Retransmission module is used in the situation that judged result is yes, described non-DCI1A is retransmitted adopt this non-DCI1A to retransmit;
Scheduler module is used for sending described transmission mode handover request after described non-DCI1A retransmits again.
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| US20060035642A1 (en) * | 2004-08-16 | 2006-02-16 | M-Stack Limited | Method for maintaining transparent mode radio bearers in a radio access network |
| CN101989873A (en) * | 2009-08-07 | 2011-03-23 | 大唐移动通信设备有限公司 | Method and device for transmitting uplink control channel |
| CN101998429A (en) * | 2009-08-13 | 2011-03-30 | 大唐移动通信设备有限公司 | Method and equipment for indicating and acquiring CCE (Control Channel Element) aggregation length in carrier aggregation system |
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