Summary of the invention
In view of this; The technical problem that the present invention solves provides a kind of method that is used to indicate transmission mode of multicast service; Indicating the transmission mode of multicast service clearly, thereby make subscriber equipment (UE) carry out corresponding subsequent processing according to the transmission mode of multicast service.
Another technical problem that the present invention will solve provides a kind of device that is used to indicate transmission mode of multicast service, and the counting/polling method and apparatus of corresponding multicast service.
For this reason, technical scheme provided by the invention is following:
A kind of transmission indicating means of multicast service comprises:
The indication information of transmission mode of multicast service is added into control messages; Said transmission mode of multicast service comprises: SFN and single sub-district PTM;
Through control channel said control messages is sent to UE.
Preferably, said multicast service is that MBMS is professional.
Preferably, said control messages is a system message, and said control channel is basic BCCH (P-BCCH) or dynamic broadcast control channel (D-BCCH).
Preferably, said control messages is the MBMS control messages, and said control channel is multicast control channel (MCCH).
The transmission indicating means of another kind of multicast service comprises:
The pairing parameter of each transmission mode is broadcast to the UE in the sub-district;
Initiate said multicast service by the pairing parameter of the transmission mode of multicast service.
Preferably, said multicast service is that MBMS is professional.
Preferably, said parameter comprises the Radio Resource that transmission MBMS control messages is adopted;
On the pairing Radio Resource of transmission mode that MBMS adopts, send the MBMS control messages.
Wherein, said Radio Resource comprises: time slot and/or frequency location, or code channel resource.
Preferably, said parameter comprises specific sign (ID);
The pairing specific ID of transmission mode so that MBMS adopts is dispatched said MBMS business.
Based on said method, the present invention also proposes a kind of transmission indicating device of multicast service, comprising:
The indication information adding device is used for the indication information of transmission mode of multicast service is added into control messages; Said transmission mode of multicast service comprises: SFN and single sub-district PTM; With
The control messages transmitting element is used for through control channel said control messages being sent to user equipment (UE).
Preferably, said multicast service is that MBMS is professional.
Preferably, said control messages is a system message, and said control channel is P-BCCH or D-BCCH.
Preferably, said control messages is the MBMS control messages, and said control channel is MCCH.
The transmission indicating device of another kind of multicast service comprises:
The parameter radio unit is used for the pairing parameter of each transmission mode is broadcast to UE; With
Indicating member is used for initiating said multicast service by the pairing parameter of transmission mode that multicast service adopts.
Preferably, said multicast service is that MBMS is professional.
Preferably, said parameter comprises the Radio Resource that transmission MBMS control messages is adopted;
Indicating member sends the MBMS control messages on the pairing Radio Resource of transmission mode that MBMS adopts.
Wherein, said Radio Resource comprises: time slot and/or frequency location, or code channel resource.
Preferably, said parameter comprises specific I D;
It is professional that the pairing specific ID of transmission mode that indicating member adopts with MBMS is dispatched said MBMS.
A kind of counting/polling method comprises:
When initiating multicast service, the indication information of transmission mode of multicast service is added the into control messages of said multicast service; Said transmission mode of multicast service comprises: SFN and single sub-district PTM;
Through control channel said control messages is sent to user equipment (UE), notice UE begins the counting/polling process;
When said multicast service was SFN SFN transmission mode, after the counting/polling response of receiving UE, notice UE stopped the counting/polling response, finishes the counting/polling process;
When said multicast service is the point-to-multipoint PTM transmission mode of single sub-district, set up Radio Resource control connection RRC with the UE that responds, finish the counting/polling process.
Preferably, said multicast service is multimedia broadcast/group broadcast service MBMS, and said control channel is multicast control channel MCCH.
Preferably, the response of the counting/polling of UE is: with the professional corresponding lead code of said MBMS.
Preferably professional unique corresponding in, said lead code, perhaps professional corresponding to all MBMS with said MBMS.
A kind of counting/polling method comprises:
When initiating multicast service, confirm the pairing parameter of transmission mode of said multicast service;
By the control messages that said parameter is sent said multicast service, notifying user equipment UE begins the counting/polling process;
When said multicast service was SFN SFN transmission mode, after the counting/polling response of receiving UE, notice UE stopped the counting/polling response, finishes the counting/polling process;
When said multicast service is the point-to-multipoint PTM transmission mode of single sub-district, set up Radio Resource control connection RRC with the UE that responds, finish the counting/polling process.
Preferably, said multicast service is multimedia broadcast/group broadcast service MBMS.
Preferably, said parameter comprises the Radio Resource that transmission MBMS control messages is adopted;
On the pairing Radio Resource of transmission mode that MBMS adopts, send the MBMS control messages.
Wherein, said Radio Resource comprises: time slot and/or frequency location, or code channel resource.
Preferably, said parameter comprises specific I D;
The pairing specific ID of transmission mode so that MBMS adopts is dispatched said MBMS business.
A kind of counting/polling device comprises:
The information adding device is used for when initiating multicast service, and the indication information of transmission mode of multicast service is added the into control messages of said multicast service; Said transmission mode of multicast service comprises: SFN and single sub-district PTM;
First message elements is used for through control channel said control messages being sent to user equipment (UE), and notice UE begins the counting/polling process;
First counting unit is used for when said multicast service is SFN SFN transmission mode, and after the counting/polling response of receiving UE, notice UE stops the counting/polling response, finishes the counting/polling process; With
Second counting unit is used for when said multicast service is the point-to-multipoint PTM transmission mode of single sub-district, sets up Radio Resource control connection RRC with the UE that responds, and finishes the counting/polling process.
Preferably, said multicast service is multimedia broadcast/group broadcast service MBMS, and said control channel is multicast control channel MCCH.
A kind of counting/polling device comprises:
Parameter is confirmed the unit, is used for when initiating multicast service, confirming the pairing parameter of transmission mode of said multicast service;
Second message elements is used for sending by said parameter the control messages of said multicast service, and notifying user equipment UE begins the counting/polling process;
The 3rd counting unit is used for when said multicast service is SFN SFN transmission mode, and after the counting/polling response of receiving UE, notice UE stops the counting/polling response, finishes the counting/polling process;
The 4th counting unit is used for when said multicast service is the point-to-multipoint PTM transmission mode of single sub-district, sets up Radio Resource control connection RRC with the UE that responds, and finishes the counting/polling process.
Preferably, said multicast service is multimedia broadcast/group broadcast service MBMS.
Preferably, said parameter comprises the Radio Resource that transmission MBMS control messages is adopted;
Second message elements sends the MBMS control messages on the pairing Radio Resource of transmission mode that MBMS adopts.
Wherein, said Radio Resource comprises: time slot and/or frequency location, or code channel resource.
Preferably, said parameter comprises specific I D;
It is professional that the pairing specific ID of transmission mode that second message elements adopts with MBMS is dispatched said MBMS.
The methods of the transmission mode of explicit and two kinds of indications of implicit expression multicast service are provided in the present invention.Explicit method is: the indication information of transmission mode of multicast service is added into control messages, through control channel said control messages is sent to UE.The method of implicit expression is: the pairing parameter of each transmission mode is broadcast to UE, and initiates the counting/polling process of said multicast service by the pairing parameter of the transmission mode of multicast service.When adopting explicit method, UE can directly learn that according to the indication information in the control messages transmission mode of multicast service is that SFN still is single sub-district PTM.When adopting implicit method, UE can obtain the corresponding transmission mode of this parameter according to said parameter, thereby learns the transmission mode of multicast service indirectly.Those skilled in the art utilize method provided by the invention can realize the indication of the transmission mode of multicast service easily.
Embodiment
In the present invention, the transmission indicating means of multicast service can be divided into two kinds of explicit and implicit expression.
A kind of explicit method comprises: in the control signaling, increase indication information, to indicate the transmission mode of multicast service clearly.For example: can in the control signaling, increase the indicating bit of 1 bit (bit), when said indicating bit " was put 1 ", the transmission mode of expression multicast service was SFN; When said indicating bit " was put 0 ", the transmission mode of expression multicast service was single sub-district PTM.Like this, UE just can learn that according to indication information in the control signaling transmission mode of multicast service is that SFN still is single sub-district PTM.
A kind of method of implicit expression comprises: the corresponding relation of setting up each transmission mode and some wireless parameter; When network side is initiated certain multicast service; Can confirm corresponding wireless parameter according to the transmission means of this multicast service, utilize the wireless parameter of said correspondence to initiate said multicast service.For example, can utilize specific Radio Resource (time slot and/or frequency location, or code channel resource) to send multicast service control message.Like this, UE just can learn that the transmission mode of relevant multicast service is SFN or single sub-district PTM according to the Radio Resource at said control messages place.
Again for example, can also utilize specific dispatch id scheduling multicast service.Like this, UE just can learn that the transmission mode of the multicast service that is scheduled is SFN or single sub-district PTM according to said specific dispatch id.
For making those skilled in the art understand the present invention better, be example with the MBMS business below, specify in conjunction with the transmission indicating means of 1 pair of a kind of multicast service provided by the invention of embodiment, Fig. 1 is the flow chart of this method.
In step 11, each MBMS is professional, and the indication information of each MBMS traffic transmission pattern adds into system message.
Suppose to have 4 kinds of MBMS business, traffic ID is respectively MBMS_A, MBMS_B, MBMS_C and MBMS_D, and corresponding transmission mode is respectively SFN, single sub-district PTM, single sub-district PTM and SFN.Can be by the corresponding relation shown in table 1-1 or the 1-2, indication information each MBMS is professional, that reach each MBMS traffic transmission pattern adds into system message.
Table 1-1
Traffic ID |
Indication information |
MBMS_A |
1 |
MBMS_B |
0 |
MBMS_C |
0 |
MBMS_D |
1 |
Table 1-2
1001 |
MBMS_A |
MBMS_B |
MBMS_C |
MBMS-D |
Can find out that each MBMS indication information professional, that reach each MBMS traffic transmission pattern is explicit corresponding relation in table 1-1; And in table 1-2, each MBMS indication information professional, that reach each MBMS traffic transmission pattern is the corresponding relation of implicit expression.
No matter be explicit correspondence or implicit expression correspondence, UE can learn each MBMS traffic transmission pattern after receiving system message.When network side was initiated certain MBMS business, UE just can confirm its transmission mode according to the professional ID of this MBMS, and correspondingly carries out subsequent process.
In step 12, broadcast said system message through BCCH.
Said BCCH includes but not limited to: P-BCCH or D-BCCH.
Can find out that embodiment 1 is through a kind of method indication MBMS traffic transmission mode of demonstration.In embodiment 1,, can make UE confirm each MBMS traffic transmission pattern through the clear and definite indication information of system message broadcasting.In practical application, can not indicate yet, but when initiating certain MBMS business, carry out independent indication to this business through system message.Fig. 2 shows the flow process of this method.
In step 21, initiating MBMS when professional, when promptly initiating the counting/polling process, the indication information of this traffic transmission pattern is added into MBMS control messages.
In step 22, the MBMS control messages is sent to UE through MCCH.
Can find out, though embodiment 2 also is through explicit method indication MBMS traffic transmission mode, be not to utilize system message but utilize the professional control messages of MBMS.Like this, an indication information that needs to add said MBMS business gets final product in the MBMS control messages, all adds into MBMS control messages and need not indication information each MBMS is professional, that reach each MBMS traffic transmission pattern.
Embodiment 1 is to adopt explicit method indication MBMS traffic transmission mode with embodiment 2, further specifies below in conjunction with the indicating means of 3 pairs of implicit expression of embodiment.Fig. 3 shows the flow process of this method.
In step 31, the Radio Resource that the pairing transmission of each transmission mode MBMS control messages is adopted is broadcast to UE.
Owing to adopt MCCH to send the MBMS control messages, therefore, the Radio Resource that said transmission MBMS control messages is adopted is the Radio Resource at MCCH channel place just, comprises the time slot and the territory frequency location of MCCH channel, or code channel resource.
For example, confirm that it is SFN that MCCH channel on the odd number subframe is implicitly indicated corresponding M BMS traffic transmission pattern, and the MCCH channel on the even number subframe implicitly to indicate corresponding M BMS traffic transmission pattern be single sub-district PTM.
After UE receives broadcasting through P-BCCH channel or D-BCCH channel, just can confirm corresponding MBMS traffic transmission pattern according to the Radio Resource at MCCH channel place.
In step 32, when initiating the MBMS business, when promptly initiating the counting/polling process, confirm to send the Radio Resource of MBMS control messages according to said traffic transmission pattern.
In step 33, send the MBMS control messages at said definite Radio Resource.
After UE receives the MBMS control messages through MCCH, can confirm said MBMS traffic transmission pattern according to the Radio Resource at MCCH place.
In embodiment 3, utilize the Radio Resource at MCCH place implicitly to indicate MBMS traffic transmission pattern.In practical application, also can utilize dispatch id implicitly to indicate MBMS traffic transmission pattern, specify below in conjunction with 4 pairs of these methods of embodiment.Fig. 4 shows the flow process of this method.
In step 41, the pairing specific ID of each transmission mode is broadcast to UE.
Can the pairing specific ID of each transmission mode be broadcast to UE by the corresponding relation shown in the table 2-1.
Table 2-1
Specific ID |
Transmission mode |
ID_1 |
SFN |
ID_2 |
Single sub-district PTM |
[0116]In step 42, when initiating the MBMS business, when promptly initiating the counting/polling process, confirm corresponding specific ID according to said traffic transmission pattern.
In step 43, it is professional to utilize corresponding specific ID to dispatch said MBMS, that is, in the dispatch that sends, with corresponding specific ID as dispatch id.
After UE receives dispatch, can confirm the MBMS traffic transmission pattern that is scheduled according to the specific ID in the dispatch.
Can find out that above-mentioned several embodiment have provided the method for complete indication MBMS traffic transmission pattern.Those skilled in the art should find out, though above-mentioned all embodiment are to be example with the MBMS business, above-mentioned all embodiment are applicable to other multicast service too, repeat no more here.
Based on the method that the foregoing description provided, the present invention also provides a kind of transmission indicating device of multicast service.Fig. 5 is this schematic representation of apparatus, and this device comprises indication information adding device S51 and control messages transmitting element S52.
Indication information adding device S51 can be professional with each MBMS, and the indication information of each MBMS traffic transmission pattern adds into system message.
Suppose to have 4 kinds of MBMS business, traffic ID is respectively MBMS_A, MBMS_B, MBMS_C and MBMS_D, and corresponding transmission mode is respectively SFN, single sub-district PTM, single sub-district PTM and SFN.Indication information adding device S51 can be by the corresponding relation shown in table 1-1 or the 1-2, and indication information each MBMS is professional, that reach each MBMS traffic transmission pattern adds into system message.
Control messages transmitting element S52 broadcasts said system message through BCCH.Said BCCH includes but not limited to: P-BCCH or D-BCCH.
Through the clear and definite indication information of system message broadcasting, can make UE confirm each MBMS traffic transmission pattern.In practical application, can not indicate yet, but when initiating certain MBMS business, carry out independent indication to this business through system message.
When initiating the MBMS business, when promptly initiating the counting/polling process, utilize indication information adding device S51 can the indication information of this traffic transmission pattern be added into MBMS control messages.Control messages transmitting element S52 sends to UE through the MCCH channel with the MBMS control messages.
Device shown in Figure 5 is to adopt explicit method indication MBMS traffic transmission mode, further specifies below in conjunction with device shown in Figure 6 indicating means to implicit expression.
Device shown in Figure 6 comprises parameter radio unit S61 and indicating member S62.
Utilize parameter radio unit S61 can the Radio Resource at the pairing MCCH channel of each transmission mode place be broadcast to UE.
For example, confirm that it is SFN that MCCH channel on the odd number subframe is implicitly indicated corresponding M BMS traffic transmission pattern, and the MCCH channel on the even number subframe implicitly to indicate corresponding M BMS traffic transmission pattern be single sub-district PTM.
After UE receives broadcasting through P-BCCH channel or D-BCCH channel, just can confirm corresponding MBMS traffic transmission pattern according to the Radio Resource at MCCH channel place.
Indicating member S62 is used for initiating said multicast service by the pairing parameter of transmission mode that multicast service adopts.When initiating the MBMS business, when promptly initiating the counting/polling process, indicating member S62 confirms the Radio Resource that the MCCH channel belongs to according to said traffic transmission pattern, and sends the MBMS control messages at said MCCH channel.
After UE receives the MBMS control messages through MCCH, can confirm said MBMS traffic transmission pattern according to the Radio Resource at MCCH place.
Utilize the Radio Resource at MCCH place can implicitly indicate MBMS traffic transmission pattern, but in practical application, also can utilize dispatch id implicitly to indicate MBMS traffic transmission pattern.
Utilize parameter radio unit S61 can the pairing specific ID of each transmission mode be broadcast to UE.
Parameter radio unit S61 can be broadcast to UE with the pairing specific ID of each transmission mode by the corresponding relation shown in the table 2-1.
When initiating the MBMS business; When promptly initiating the counting/polling process; Indicating member S62 can confirm corresponding specific ID according to said traffic transmission pattern, and it is professional to utilize corresponding specific ID to dispatch said MBMS, promptly; In the dispatch that sends, with corresponding specific ID as dispatch id.
After UE receives dispatch, can confirm the MBMS traffic transmission pattern that is scheduled according to the specific ID in the dispatch.
Can find out, can realize indication MBMS traffic transmission pattern through said apparatus.Those skilled in the art should find out, though above-mentioned all devices all are to be example with the MBMS business, above-mentioned all devices are applicable to other multicast service too, repeat no more here.
The present invention also provides a kind of counting/polling method that can indicate transmission mode of multicast service accordingly, is example with the MBMS business still below, and this method is further specified.
Initiate MBMS when professional, the indication information of this MBMS service transmission mode is added into MBMS control messages.
Through MCCH the MBMS control messages is sent to UE, notice UE begins the counting/polling process.
After UE learns MBMS traffic transmission pattern according to indication; If said MBMS traffic transmission pattern is SFN; And UE is interested in this MBMS business, selects when then initiating counting/polling in the base station to carry out the counting/polling response with the professional corresponding lead code of MBMS, and this detailed process comprises:
UE selects one, and the access moment is carried out the counting/polling response with what reserve in the sub-district with the professional corresponding lead code of this MBMS at random;
The base station is upgraded MCCH and is gone up the message of sending after receiving the counting/polling response, and decision order UE stops the counting/polling response;
Base station notice UE stops the counting/polling response.
Subsequently, when carrying out the professional transmission of MBMS, the base station is dispatched UE and is received this MBMS business on MCCH channel or other channel.
Wherein, said lead code can be corresponding one by one with the MBMS SFN business in the sub-district, the professional corresponding same lead code of also can be in the sub-district all MBMS, and this corresponding relation should be in advance by base station notice UE.Adopt this kind lead code, the process of counting/polling has also obtained its corresponding simplified.
After UE learns MBMS traffic transmission pattern according to indication; If said MBMS traffic transmission pattern is single sub-district PTM; And UE is interested in this MBMS business; Then completion need be set up the counting/polling process of Radio Resource control connection (RRC, Radio Resource Control), and this process comprises:
UE selects random access lead code to insert according to the RRC access information that receives;
The base station responds detected random access lead code;
All UE that send this lead code initiate RRC and connect the request of foundation, in this message, comprise contents such as UE IE, MBMS traffic ID;
Connect the request of foundation if there are a plurality of UE to initiate RRC in identical running time-frequency resource position simultaneously, will bump.At this moment, the base station is sent collision and is solved order, and collision has taken place in indication, inserts unsuccessful;
If do not bump, the MBMS configuration information to this UE is sent to UE this moment in the base station, comprises UE ID, feedback RNTI etc.
The another kind of counting/polling method that can indicate transmission mode of multicast service comprises:
When initiating the MBMS business, confirm the pairing parameter of this MBMS traffic transmission pattern;
By the control messages that said parameter is sent said multicast service, notice UE begins the counting/polling process;
When said multicast service was the SFN transmission mode, after the counting/polling response of receiving UE, notice UE stopped the counting/polling response, finishes the counting/polling process;
When said multicast service is single sub-district PTM transmission mode, set up Radio Resource control connection RRC with the UE that responds, finish the counting/polling process.
Wherein, said parameter comprises sends the Radio Resource (time slot and/or frequency location, or code channel resource) that the MBMS control messages is adopted, or specific I D.
When said parameter during, should on the pairing Radio Resource of transmission mode that MBMS adopts, send the MBMS control messages for the Radio Resource that sends the MBMS control messages and adopted.
When said parameter was specific I D, it was professional to dispatch said MBMS with the pairing specific ID of transmission mode that MBMS adopts.
Based on the above-mentioned counting/polling method that is used for multicast service, the present invention also provides the counting/polling device that is used for multicast service accordingly.
Fig. 7 shows a kind of counting/polling device that is used for multicast service, and this device comprises: information adding device S71, the first message elements S72, the first counting unit S73 and the second counting unit S74.
When initiating multicast service, information adding device S71 can add the indication information of transmission mode of multicast service the into control messages of said multicast service.The first message elements S72 sends to UE through control channel with said control messages, and notice UE begins the counting/polling process.
Wherein, when multicast service was the MBMS business, said control channel was MCCH.
When said multicast service is the SFN transmission mode, the first counting unit S73 will notify UE to stop the counting/polling response after the counting/polling response of receiving UE, finish the counting/polling process;
When said multicast service is single sub-district PTM transmission mode, the second counting unit S74 will set up RRC with the UE of response and be connected, and finish the counting/polling process.
Fig. 8 shows the counting/polling device that another kind is used for multicast service, and this device comprises: parameter is confirmed cell S 81, the second message elements S82, the 3rd counting unit S83 and the 4th counting unit S84.
When initiating multicast service, utilize parameter to confirm that cell S 81 can confirm the pairing parameter of transmission mode of said multicast service.The second message elements S82 will send the control messages of said multicast service by said parameter, and notice UE begins the counting/polling process.
When said multicast service is the SFN transmission mode, the 3rd counting unit S83 will notify UE to stop the counting/polling response after the counting/polling response of receiving UE, finish the counting/polling process;
When said multicast service is single sub-district PTM transmission mode, the 4th counting unit S84 will set up RRC with the UE of response and be connected, and finish the counting/polling process.
Said multicast service can be but be not limited to the MBMS business.Said parameter comprises sends the Radio Resource (time slot and/or frequency location, or code channel resource) that the MBMS control messages is adopted, or specific I D.
When said parameter during for the Radio Resource that sends the MBMS control messages and adopted, the second message elements S82 will be on the pairing Radio Resource of the transmission mode that MBMS adopts, transmission MBMS control messages.
When said parameter was specific I D, it is professional that the second message elements S82 will dispatch said MBMS with the pairing specific ID of the transmission mode that MBMS adopts.
Those skilled in the art can understand, combine here various exemplary method step that the disclosed embodiments describe and device unit all can electronic hardware, software or the combination of the two realize.In order to be clearly shown that the interchangeability between the hardware and software, more than various exemplary steps and unit are all carried out description generally with its functional form.This functional be to realize or realize depending on the design constraint that certain applications and whole system are realized with software with hardware.Those skilled in the art can be directed against each certain applications, realize in many ways described functional, but the result of this realization should not be construed as and on the contrary deviates from scope of the present invention.
Utilize general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logical device, discrete gate or transistor logic, discrete hardware components or the combination in any among them, can realize or carry out the various exemplary unit that combines embodiment disclosed herein to describe.General processor possibly be a microprocessor, but in another kind of situation, this processor possibly be processor, controller, microcontroller or the state machine of any routine.Processor also possibly be implemented as the combination of computing equipment, for example, and the combination of DSP and microprocessor, a plurality of microprocessor, one or more microprocessor or any other this kind structure that combines the DSP core more.
In conjunction with the step of the described method of above-mentioned disclosed embodiment can directly be presented as hardware, the two combination of the software module carried out by processor or this.Software module possibly be present in the storage media of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, mobile disk, CD-ROM or any other form well known in the art.The coupling of a kind of exemplary storage medium and processor, thus make processor can be from this storage media read message, and can be to this storage media write information.In the replacement instance, storage media is the part of processor.Processor and storage media possibly be present among the ASIC.This ASIC possibly be present in the subscriber station.In a replacement instance, the discrete assembly that processor and storage media can be used as in the subscriber station exists.
According to said disclosed embodiment, can be so that those skilled in the art can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are conspicuous, and the general principles of definition here also can be applied to other embodiment on the basis that does not depart from the scope of the present invention with purport.Above-described embodiment is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.