CN103929233A - Hybrid multi-system radio remote unit (RRU) and method of transmitting time division (TD) signals thereof - Google Patents
Hybrid multi-system radio remote unit (RRU) and method of transmitting time division (TD) signals thereof Download PDFInfo
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Abstract
The invention discloses a radio remote unit (RRU) and a method of transmitting time division (TD) signals thereof. After a DAU in the RRU receives downlink signals of multiple communication systems, TD signals are converted into corresponding downlink base frames, and the downlink base frames carrying corresponding time delay parameters are forwarded to the DRU in the RRU connected with the downlink base frames; and after the DRU receives the downlink base frames with the time delay parameters, a downlink cache time delay value of the TD signals in the DRU is calculated, and radio transmission is carried out after air interfaces of the TD signals after frame decoding are aligned in the DRU. In the multi-system RRU, the DAU converts TD signals into corresponding downlink base frames after the downlink signals of multiple communication systems are received and time delay adjustment of the downlink TD signals is carried out by each DRU in the RRU according to the time delay parameters, alignment of air interfaces of TD signals and receiving and sending in the radio part can be ensured, and transmission of the TD signal and signals of other communication systems in the same RRU can be realized.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of method of mixing multi-modulation scheme Remote Radio Unit and transmission time division signal thereof.
Background technology
At present, along with the arrival in 3G epoch and the upgrading of the communication technology, within very long a period of time, all can there is the network coexisted situation of 3G network and 2G, if dispose a set of complete equipment for every kind of standard, can bring Cost Problems and project plan problem, multi-mode radio frequency extension unit (RRU) system can meet the demand that operator makes full use of existing 2G standard macro station resource, can increase the development trend of 3G standard power system capacity again, solve networking cost and project plan, the problems such as addressing, can increase the coverage of WLAN in addition, for operator provides the mixed mulch solution of multi-modulation scheme.
For a multimode RRU system that comprises TD signal, because TD signal is time-multiplexed, to TD signal, control in time has strict requirement, if will cause communication failure to control launch time of TD signal is bad; Therefore quite important to the delay operation of TD signal.In order to realize the alignment of eating dishes without rice or wine of TD signal in radio frequency part, need to do accurate time delay adjustment to the RRU system of every one-level, guarantee that IQ data are in the alignment transmitting-receiving of eating dishes without rice or wine.If eated dishes without rice or wine, do not line up, will there will be signal to be cut off, power amplifier output abnormality, finally causes communication to go wrong.
For a multimode RRU system that comprises TD signal, when actual deployment, will inevitably occur that this RRU is by the leading problem of managing or being dominated management by the BBU of other standards (as GSM) of TD BBU.If with the leading management of TD BBU, will carry out upgrading to the old equipment of existing deployment so, this is obviously unfavorable.Therefore for compatible existing equipment, the management of multimode RRU system should be dominated by old equipment, and TD BBU is auxiliary, and in the multimode RRU system that comprises TD signal, the signal of other standards of take is main reference, and TD signal it is adjusted relatively.Thus, TD signal can carry out necessary adjustment along with the state of BBU of other standard signals or the change of the state of multimode RRU itself; Due to TD BBU can not be as the RRU of single standard independent direct management multimode RRU, before so the general method of directly being measured the downstream signal buffer memory that calculates and arrange each single standard RRU by BBU for the multimode RRU system of the current this TD of comprising signal by inapplicable, reason is that the descending TD signal in multimode RRU system can be adjusted along with the change of the state of other standards BBU or the state of multimode RRU itself, if the excessive situation that just there will be downstream signal to be cut away by switch of adjusting range, causes communication abnormality.
Summary of the invention
The embodiment of the present invention provides a kind of mixing multi-modulation scheme Remote Radio Unit (RRU, Radio Remote Unit) and transmission time-division (TD, Time Division) method of signal, in order to realize the time delay of automatically adjusting descending TD signal in multimode RRU, guarantee the alignment transmitting-receiving of eating dishes without rice or wine of descending TD signal.
A kind of method of transmitting time-division TD signal in multi-modulation scheme radio frequency remote unit RRU of mixing that the embodiment of the present invention provides, comprising:
Multi-modulation scheme Digital Access control unit DAU in RRU receives the downstream signal of multiple communication standard, according to the unified base frame format of using of described multiple communication standard, descending base frame corresponding to TD signal wherein convert to, and be transmitted to the far end radio frequency extension unit DRU in connected RRU carry corresponding delay parameter in described descending base frame after;
Described DRU carries after the descending base frame of delay parameter in reception, according to described delay parameter, the down buffer storage time delay value of calculating TD signal in described DRU, and according to the described down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in described DRU.
A kind of mixing multi-modulation scheme radio frequency remote unit RRU that the embodiment of the present invention provides, comprising: multi-modulation scheme Digital Access control unit DAU and connected far end radio frequency extension unit DRU;
Described DAU, for receiving the downstream signal of multiple communication standard, according to the unified base frame format of using of described multiple communication standard, descending base frame corresponding to TD signal wherein convert to, and be transmitted to the far end radio frequency extension unit DRU in connected RRU carry corresponding delay parameter in described descending base frame after;
Described DRU, for carrying after the descending base frame of delay parameter in reception, according to described delay parameter, the down buffer storage time delay value of calculating TD signal in described DRU, and according to the described down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in described DRU.
The beneficial effect of the embodiment of the present invention comprises:
A kind of method of mixing multi-modulation scheme radio frequency remote unit RRU and transmission TD signal thereof that the embodiment of the present invention provides, DAU in RRU is after receiving the downstream signal of multiple communication standard, according to the unified base frame format of using of multiple communication standard, descending base frame corresponding to TD signal wherein convert to, and be transmitted to the DRU in connected RRU carry corresponding delay parameter in descending base frame after; DRU carries in reception after the descending base frame of delay parameter, according to delay parameter, calculates the down buffer storage time delay value of TD signal in DRU, and according to the down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in DRU.Due in this multi-modulation scheme RRU, DAU is after receiving the downstream signal of multiple communication standard, can according to the unified base frame format of using of multiple communication standard, descending base frame corresponding to TD signal wherein convert to, and the time delay adjustment of descending TD signal each DRU in RRU adjusts according to delay parameter, guarantee to realize in radio frequency part the alignment transmitting-receiving of eating dishes without rice or wine of TD signal, realized the signal that transmits TD signal and other communication standard in same RRU.And, in same RRU, transmit the signal of multiple communication standard, can effectively reduce network O&M cost, realize multi-modulation scheme multi-service unified planning.
Accompanying drawing explanation
The structural representation of the RRU that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of the host-host protocol that Fig. 2 uses for the RRU networking that the embodiment of the present invention provides;
The transmission time sequence figure of signal in the RRU that Fig. 3 provides for the embodiment of the present invention;
The transmission time sequence figure of the 5ms frame head of TD signal in the RRU that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the method for the mixing multi-modulation scheme radio frequency remote unit RRU that the embodiment of the present invention is provided and transmission TD signal thereof is described in detail.
A kind of method of transmitting time-division TD signal in multi-modulation scheme radio frequency remote unit RRU of mixing that the embodiment of the present invention provides, comprising:
DAU in RRU receives the downstream signal of multiple communication standard, according to the unified base frame format of using of multiple communication standard, descending base frame corresponding to TD signal wherein convert to, and carry corresponding delay parameter in descending base frame after, be transmitted to the far end radio frequency extension unit DRU in connected RRU;
This DRU carries in reception after the descending base frame of delay parameter, according to delay parameter, calculates the down buffer storage time delay value of TD signal in DRU, and according to the down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in DRU.
The method of transmitting TD signal in the above-mentioned RRU embodiment of the present invention being provided below by instantiation is elaborated.
The networking mode of the RRU that Fig. 1 provides for the embodiment of the present invention, can find out, DAU receives downstream signal and the corresponding delay parameter from unlike signal source by optical fiber or cable, such as: TD BBU, GSM BBU or GSM coupled antenna, WLAN etc.Wherein, the host-host protocol schematic diagram that RRU networking is as shown in Figure 2 used is known, between TD BBU and DAU, be by Ir protocol transmission data, and in RRU inside, be by CPRI protocol transmission data, therefore, DAU, after receiving the downstream signal of different systems, can convert thereof into consolidation form, to transmit in RRU.
Preferably, owing to can transmit the signal of multiple types in RRU, therefore, DAU is after converting TD signal to corresponding descending base frame, also the descending CPRI base frame of TD signal and base frame such as GSM signal can be carried out to frame aligns, and, can calculate the downlink frame alignment time delay value producing in this process, for calculating descending TD signal time delay, the DRU in follow-up RRU prepares.
DAU is when being forwarded to connected DRU by the descending base frame of the downstream signal of various standards by optical fiber, also can in this descending base frame, carry corresponding delay parameter, this delay parameter is that the form with the User Defined control word of CPRI agreement is carried in descending base frame.Particularly, this delay parameter can comprise the Timing Advance obtaining from TD BBU, DAU self calculates and down forwards time delay value and forwarded upstream time delay value, the downlink frame alignment time delay value in DAU, and the Optical Fiber Transmission time delay value between TD BBU and DAU etc. at the inner TD signal of DAU.
The DRU being connected with DAU is after receiving the descending base frame that carries above-mentioned delay parameter, can separate frame to the descending base frame of various standards, recover corresponding TD signal, GSM signal or WLAN signal etc., and other time delay values of measuring according to the delay parameter carrying in descending base frame and DRU self, calculate the down buffer storage time delay value of TD signal in this DRU, thereby and according to this down buffer storage time delay value, TD signal is carried out to the alignment of eating dishes without rice or wine that buffer memory is realized signal.
While there is the situation of multistage DRU cascade in RRU, from DAU, receive the DRU of descending base frame, the DRU being directly connected by optical fiber with DAU, by said method, TD signal is carried out after buffer memory radio frequency sends, also can judge whether to exist next stage DRU, when judgement exists next stage DRU, after the delay parameter carrying in the descending base frame that renewal receives, be transmitted to next stage DRU;
From upper level DRU, receive the DRU of descending base frame, can be according to the delay parameter after the renewal of carrying in the descending base frame receiving, the down buffer storage time delay value of calculating TD signal in DRU at the corresponding levels, and according to this down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in DRU at the corresponding levels; And, when judgement exists next stage DRU, be transmitted to next stage DRU after upgrading the delay parameter carrying in descending base frame, until afterbody DRU.
Particularly, the DRU at different levels in RRU can be used following formula to calculate the down buffer storage time delay value BUF_dl of TD signal in DRU at the corresponding levels
1:
BUF_dl
1=Timing Advance-F
1-L
1-M
1-F
2-L
2-M
2;
Wherein, F
1for the Optical Fiber Transmission time delay value between TD BBU and DAU; F
2for the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels; M
1for the downlink frame alignment time delay value in DAU; M
2downlink processing time delay value for TD signal in DRU at the corresponding levels; L
1for the time delay value that down forwards at the inner TD signal of DAU; L
2for TD signal in all DRU between DAU and DRU at the corresponding levels, down forward time delay value sum.
Particularly, above-mentioned calculating down buffer storage time delay value BUF_dl
1formula in each delay parameter of using, the circular of the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels be utilize number of patent application for 200710030518.X in disclosed method, be not repeated; And being the mode combining by signal winding and hardware testing, downlink processing time delay value measures.
Particularly, when in RRU as shown in Figure 3, each DRU is to next stage DRU converting downlink base frame, that upgrades TD signal in all DRU between DAU and DRU at the corresponding levels in delay parameter down forwards time delay value sum, and the time delay value that down forwards being about in DRU at the corresponding levels joins this and down forwards in time delay value sum.
Preferably, because upward signal and the downstream signal of TD signal adopts same frequency, need to distinguish uplink and downlink signal by time-multiplexed mode.Therefore, in the descending base frame that DAU forms, also will comprise descending 5ms frame head, the ad-hoc location that in descending base frame, the descending 5ms frame head of TD signal is put into descending base frame with a form of setting character issues.
The setting the character whether ad-hoc location of the descending base frame that each DRU can receive by detection comprises the descending 5ms frame head that represents TD signal recovers descending 5ms frame head.And according to the descending 5ms frame head recovering, calculate the up-downgoing switching over point of DRU at the corresponding levels, and after radio frequency transmission downstream signal, the up-downgoing switching over point that utilization calculates switches to reception upward signal, to guarantee the switching over point of radio frequency mouth and aliging of up-downgoing TD signal.
Further, in RRU, the transmitting procedure of upward signal specifically comprises:
Each DRU in RRU can be according to the delay parameter carrying in the descending base frame receiving, the up caching delay value of calculating TD signal in DRU at the corresponding levels, and according to the up caching delay value calculating, the TD signal of receiving, after buffer memory converts up base frame to, is transmitted to next stage DRU or connected DAU;
Next stage DRU receives the up base frame that upper level DRU sends, and after the up base frame frame with changing in DRU at the corresponding levels aligns, is transmitted to next stage DRU or connected DAU;
The up base frame solution frame that DAU sends connected DRU is to be transmitted to corresponding TD BBU of base station after TD signal.
Particularly, in DRU at different levels, can use following formula to calculate the up caching delay value BUF_ul of TD signal in DRU at the corresponding levels
1:
BUF_ul
1=Timing Advance-F
1-F
2-M
3-M
4-L
3-L
4;
Wherein, F
1for the Optical Fiber Transmission time delay value between TD BBU and DAU; F
2for the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels; L
3for the forwarded upstream time delay value at the inner TD signal of DAU; L
4forwarded upstream time delay value sum for TD signal in all DRU between DAU and DRU at the corresponding levels; M
3up processing delay value for TD signal in DRU at the corresponding levels; M
4uplink frame alignment time delay value sum for TD signal in all DRU between DAU and DRU at the corresponding levels.
Particularly, the up caching delay value of above-mentioned calculating BUF ul
1formula in each delay parameter of using up processing delay value and downlink processing time delay value similar, be also that the mode combining by signal winding and hardware testing measures.
In the specific implementation, frame that may not be strict due to the upward signal possibility of the DRU of the superior and the subordinate reception aligns, in order to make the alignment of eating dishes without rice or wine of the upward signal strict guarantee TD signal that DRU at different levels that TD BBU receives send, just need to be when next stage DRU receives the up base frame of upper level DRU transmission, after aliging, the up base frame frame with changing in DRU at the corresponding levels is transmitted to next stage DRU or connected DAU, the alignment of eating dishes without rice or wine when guaranteeing that the upward signal of DRU at different levels sends to TD BBU, and the operation of frame alignment can produce uplink frame alignment time delay value in DRU at different levels.
Particularly, in RRU as shown in Figure 3, the up base frame that DRU3 generates all can produce uplink frame alignment time delay value and forwarded upstream time delay value when the forwarding through DRU2 and DRU1, and the up base frame that DRU2 generates can produce corresponding uplink frame alignment time delay value and forwarded upstream time delay value when the forwarding through DRU1, can find out that uplink frame alignment time delay value and the forwarded upstream time delay value of the up base frame experience that each DRU generates is different.Like this, when each DRU forwards up base frame to next stage DRU, upgrade forwarded upstream time delay value sum and the uplink frame alignment time delay value sum of TD signal in all DRU between DAU and DRU at the corresponding levels in delay parameter, the forwarded upstream time delay value and the uplink frame alignment time delay value that are about in DRU at the corresponding levels join respectively in this forwarded upstream time delay value sum and uplink frame alignment time delay value sum.
Particularly, the up base frame that next stage DRU sends upper level DRU aligns with the up base frame frame of changing in DRU at the corresponding levels, by following manner, realizes:
Each DRU, according to the setting character carrying in the descending base frame receiving, generates the up 5ms frame head of TD signal, and up base frame upper level DRU being sent according to the up 5ms frame head generating aligns with the up base frame frame of changing in DRU at the corresponding levels.
Particularly, after the setting character that each DRU carries in receiving descending base frame, determine that the time delay through T_offset is up 5ms frame head; As can be seen from Figure 4, T_offset can be by following computing formula:
T_offset=2 * Timing Advance-Tdl-Tul;
Wherein, Tdl is the descending overall delay value between BBU and DRU at the corresponding levels; Tul is the up overall delay value between BBU and DRU at the corresponding levels.
Based on same inventive concept, the embodiment of the present invention also provides a kind of mixing multi-communication standard radio frequency remote unit RRU, because the principle that this Remote Radio Unit is dealt with problems is similar to the method for transmitting TD signal in aforementioned a kind of RRU, therefore the enforcement of this Remote Radio Unit can, referring to the enforcement of method, repeat part and repeat no more.
A kind of mixing multi-communication standard radio frequency remote unit RRU that the embodiment of the present invention provides, comprising: DAU and connected DRU;
This DAU, for receiving the downstream signal of multiple communication standard, according to the unified base frame format of using of multiple communication standard, descending base frame corresponding to TD signal wherein convert to, and carry corresponding delay parameter in descending base frame after, be transmitted to the far end radio frequency extension unit DRU in connected RRU;
This DRU, for carrying after the descending base frame of delay parameter in reception, according to delay parameter, calculate the down buffer storage time delay value of TD signal in DRU, and according to the down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in DRU.
Further, while there is multistage DRU in RRU, from DAU, receive the DRU of descending base frame, also when there is next stage DRU in judgement, be transmitted to next stage DRU after upgrading the delay parameter carrying in the descending base frame receiving;
From upper level DRU, receive the DRU of descending base frame, also for the delay parameter after the renewal of carrying according to descending base frame, the down buffer storage time delay value of calculating TD signal in DRU at the corresponding levels, and according to this down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in DRU at the corresponding levels; And, when judgement exists next stage DRU, be transmitted to next stage DRU after upgrading the delay parameter carrying in descending base frame.
Further, the DRU at different levels in RRU, specifically for being used following formula to calculate the down buffer storage time delay value BUF_dl of TD signal in DRU at the corresponding levels
1:
BUF_dl
1=Timing Advance-F
1-L
1-M
1-F
2-L
2-M
2;
Wherein, F
1for the Optical Fiber Transmission time delay value between TD BBU and DAU; F
2for the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels; M
1for the downlink frame alignment time delay value in DAU; M
2downlink processing time delay value for TD signal in DRU at the corresponding levels; L
1for the time delay value that down forwards at the inner TD signal of DAU; L
2for TD signal in all DRU between DAU and DRU at the corresponding levels, down forward time delay value sum.
Further, each DRU in RRU, also for the setting character carrying according to the descending base frame receiving, calculate the up-downgoing switching over point of DRU at the corresponding levels, and after radio frequency transmission downstream signal, the up-downgoing switching over point that utilization calculates switches to reception upward signal, the setting character of the descending 5ms frame head that wherein, this setting character is the TD signal that carries in descending base frame.
Further, while there is multistage DRU in RRU, each DRU in RRU, the delay parameter for carrying according to the descending base frame receiving also, the up caching delay value of calculating TD signal in DRU at the corresponding levels, and according to the up caching delay value calculating, the TD signal of receiving, after buffer memory converts up base frame to, is transmitted to next stage DRU or connected DAU;
Next stage DRU, the up base frame also sending for receiving upper level DRU is transmitted to next stage DRU or connected DAU after the up base frame frame with changing in DRU at the corresponding levels aligns;
This DAU is to be also transmitted to corresponding TD BBU of base station after TD signal for the up base frame solution frame that connected DRU is sent.
Further, the DRU at different levels in RRU, specifically for being used following formula to calculate the up caching delay value BUF_ul of TD signal in DRU at the corresponding levels
1:
BUF_ul
1=Timing Advance-F
1-F
2-M
3-M
4-L
3-L
4;
Wherein, F
1for the Optical Fiber Transmission time delay value between TD BBU and DAU; F
2for the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels; L
3for the forwarded upstream time delay value at the inner TD signal of DAU; L
4forwarded upstream time delay value sum for TD signal in all DRU between DAU and DRU at the corresponding levels; M
3up processing delay value for TD signal in DRU at the corresponding levels; M
4uplink frame alignment time delay value sum for TD signal in all DRU between DAU and DRU at the corresponding levels.
Further, each DRU in RRU, specifically for according to the setting character carrying in the descending base frame receiving, generate the up 5ms frame head of TD signal, and up base frame upper level DRU being sent according to the up 5ms frame head generating aligns with the up base frame frame of changing in DRU at the corresponding levels.
Further, each DRU in RRU, after the setting character carrying in receiving descending base frame, determines that the time delay through T_offset is up 5ms frame head; Wherein, T_offset is by following computing formula:
T_offset=2 * Timing Advance-Tdl-Tul;
Wherein, Tdl is the descending overall delay value between BBU and DRU at the corresponding levels; Tul is the up overall delay value between BBU and DRU at the corresponding levels.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention and can realize by hardware, and the mode that also can add necessary general hardware platform by software realizes.Understanding based on such, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
A kind of method of mixing multi-communication standard radio frequency remote unit RRU and transmission TD signal thereof that the embodiment of the present invention provides, DAU in RRU is after receiving the downstream signal of multiple communication standard, according to the unified base frame format of using of multi-communication standard, descending base frame corresponding to TD signal wherein convert to, and be transmitted to the DRU in connected RRU carry corresponding delay parameter in descending base frame after; DRU carries in reception after the descending base frame of delay parameter, according to delay parameter, calculates the down buffer storage time delay value of TD signal in DRU, and according to the down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in DRU.Due in this multi-modulation scheme RRU, DAU is after receiving the downstream signal of multiple communication standard, can according to the unified base frame format of using of multi-communication standard, descending base frame corresponding to TD signal wherein convert to, and the time delay adjustment of descending TD signal each DRU in RRU adjusts according to delay parameter, guarantee to realize in radio frequency part the alignment transmitting-receiving of eating dishes without rice or wine of TD signal, realized the signal that transmits TD signal and other communication standard in same RRU.And, in same RRU, transmit the signal of multiple communication standard, can effectively reduce network O&M cost, realize multi-modulation scheme multi-service unified planning.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (16)
1. mix a method of transmitting time-division TD signal in multi-modulation scheme radio frequency remote unit RRU, it is characterized in that, comprising:
Multi-modulation scheme Digital Access control unit DAU in RRU receives the downstream signal of multiple communication standard, according to the unified base frame format of using of described multiple communication standard, descending base frame corresponding to TD signal wherein convert to, and be transmitted to the far end radio frequency extension unit DRU in connected RRU carry corresponding delay parameter in described descending base frame after;
Described DRU carries after the descending base frame of delay parameter in reception, according to described delay parameter, the down buffer storage time delay value of calculating TD signal in described DRU, and according to the described down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in described DRU.
2. the method for claim 1, is characterized in that, while there is multistage DRU in RRU, also comprises:
From DAU, receive the DRU of descending base frame, when judgement exists next stage DRU, after the delay parameter carrying in the descending base frame that renewal receives, be transmitted to next stage DRU;
From upper level DRU, receive the DRU of descending base frame, according to the delay parameter after the renewal of carrying in descending base frame, the down buffer storage time delay value of calculating TD signal in DRU at the corresponding levels, and according to this down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in DRU at the corresponding levels; And, when judgement exists next stage DRU, be transmitted to next stage DRU after upgrading the delay parameter carrying in descending base frame.
3. method as claimed in claim 2, is characterized in that, the DRU at different levels in RRU, according to the descending base frame receiving, calculate the down buffer storage time delay value of TD signal in DRU at the corresponding levels, specifically comprise:
Each DRU in RRU is used following formula to calculate the down buffer storage time delay value BUF_dl of TD signal in DRU at the corresponding levels
1:
BUF_dl
1=Timing Advance-F
1-F
1-M
1-F
2-L
2-M
2;
Wherein, F
1for the Optical Fiber Transmission time delay value between TD BBU and DAU; F
2for the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels; M
1for the downlink frame alignment time delay value in DAU; M
2downlink processing time delay value for TD signal in DRU at the corresponding levels; L
1for the time delay value that down forwards at the inner TD signal of DAU; L
2for TD signal in all DRU between DAU and DRU at the corresponding levels, down forward time delay value sum.
4. the method as described in claim 1-3 any one, is characterized in that, also comprises: the setting character of the descending 5ms frame head of TD signal in described descending base frame;
Described method, also comprises:
Each DRU calculates the up-downgoing switching over point of DRU at the corresponding levels according to the described setting character carrying in the descending base frame receiving, and after radio frequency transmission downstream signal, utilizes the up-downgoing switching over point calculating to switch to reception upward signal.
5. method as claimed in claim 4, is characterized in that, while there is multistage DRU in RRU, also comprises:
Each DRU in RRU is according to the delay parameter carrying in the descending base frame receiving, the up caching delay value of calculating TD signal in DRU at the corresponding levels, and according to the described up caching delay value calculating, the TD signal of receiving, after buffer memory converts up base frame to, is transmitted to next stage DRU or connected DAU;
Next stage DRU receives the up base frame that upper level DRU sends, and after the up base frame frame with changing in DRU at the corresponding levels aligns, is transmitted to next stage DRU or connected DAU;
The up base frame solution frame that described DAU sends connected DRU is to be transmitted to corresponding TD BBU of base station after TD signal.
6. method as claimed in claim 5, is characterized in that, the DRU at different levels in RRU determine the up caching delay value of TD signal in DRU at the corresponding levels, specifically comprise:
DRU at different levels are used following formula to calculate the up caching delay value BUF_ul of TD signal in DRU at the corresponding levels
1:
BUF_ul
1=Timing Advance-F
1-F
2-M
2-M
4-L
3-L
4;
Wherein, F
1for the Optical Fiber Transmission time delay value between TD BBU and DAU; F
2for the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels; L
3for the forwarded upstream time delay value at the inner TD signal of DAU; L
4forwarded upstream time delay value sum for TD signal in all DRU between DAU and DRU at the corresponding levels; M
3up processing delay value for TD signal in DRU at the corresponding levels; M
4uplink frame alignment time delay value sum for TD signal in all DRU between DAU and DRU at the corresponding levels.
7. method as claimed in claim 5, is characterized in that, the up base frame that next stage DRU sends upper level DRU aligns with the up base frame frame of changing in DRU at the corresponding levels, specifically comprises:
Each DRU, according to the described setting character carrying in the descending base frame receiving, generates the up 5ms frame head of TD signal, and up base frame upper level DRU being sent according to the up 5ms frame head generating aligns with the up base frame frame of changing in DRU at the corresponding levels.
8. method as claimed in claim 7, is characterized in that, each DRU, according to the described setting character carrying in the descending base frame receiving, generates the up 5ms frame head of TD signal, specifically comprises:
After the described setting character that each DRU carries in receiving descending base frame, determine that the time delay through T_offset is up 5ms frame head; Wherein, T_offset is by following computing formula:
T_offset=2 * Timing Advance-Tdl-Tul;
Wherein, Tdl is the descending overall delay value between BBU and DRU at the corresponding levels; Tul is the up overall delay value between BBU and DRU at the corresponding levels.
9. mix a multi-modulation scheme radio frequency remote unit RRU, it is characterized in that, comprising: multi-modulation scheme Digital Access control unit DAU and connected far end radio frequency extension unit DRU;
Described DAU, for receiving the downstream signal of multiple communication standard, according to the unified base frame format of using of described multiple communication standard, descending base frame corresponding to TD signal wherein convert to, and be transmitted to the far end radio frequency extension unit DRU in connected RRU carry corresponding delay parameter in described descending base frame after;
Described DRU, for carrying after the descending base frame of delay parameter in reception, according to described delay parameter, the down buffer storage time delay value of calculating TD signal in described DRU, and according to the described down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in described DRU.
10. Remote Radio Unit as claimed in claim 9, it is characterized in that, while there is multistage DRU in RRU, from DAU, receive the DRU of descending base frame, also when there is next stage DRU in judgement, be transmitted to next stage DRU after upgrading the delay parameter carrying in the descending base frame receiving;
From upper level DRU, receive the DRU of descending base frame, also for the delay parameter after the renewal of carrying according to descending base frame, the down buffer storage time delay value of calculating TD signal in DRU at the corresponding levels, and according to this down buffer storage time delay value calculating, the TD signal of separating after frame is eated dishes without rice or wine to carry out radio frequency transmission after alignment in DRU at the corresponding levels; And, when judgement exists next stage DRU, be transmitted to next stage DRU after upgrading the delay parameter carrying in descending base frame.
11. Remote Radio Unit as claimed in claim 10, is characterized in that, the DRU at different levels in described RRU, specifically for being used following formula to calculate the down buffer storage time delay value BUF_dl of TD signal in DRU at the corresponding levels
1:
BUF_dl
1=Timing Advance-F
1-L
1-M
1-F
2-L
2-M
2;
Wherein, F
1for the Optical Fiber Transmission time delay value between TD BBU and DAU; F
2for the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels; M
1for the downlink frame alignment time delay value in DAU; M
2downlink processing time delay value for TD signal in DRU at the corresponding levels; L
1for the time delay value that down forwards at the inner TD signal of DAU; L
2for TD signal in all DRU between DAU and DRU at the corresponding levels, down forward time delay value sum.
12. Remote Radio Unit as described in claim 9-11 any one, it is characterized in that, each DRU in described RRU, also for the setting character carrying according to the descending base frame receiving, calculate the up-downgoing switching over point of DRU at the corresponding levels, and after radio frequency transmission downstream signal, the up-downgoing switching over point that utilization calculates switches to reception upward signal, wherein, and the setting character of the descending 5ms frame head that described setting character is the TD signal that carries in descending base frame.
13. Remote Radio Unit as claimed in claim 12, it is characterized in that, while there is multistage DRU in RRU, each DRU in RRU, the delay parameter for carrying according to the descending base frame receiving also, calculates the up caching delay value of TD signal in DRU at the corresponding levels, and according to the described up caching delay value calculating, the TD signal of receiving, after buffer memory converts up base frame to, is transmitted to next stage DRU or connected DAU;
Next stage DRU, the up base frame also sending for receiving upper level DRU is transmitted to next stage DRU or connected DAU after the up base frame frame with changing in DRU at the corresponding levels aligns;
Described DAU is to be also transmitted to corresponding TD BBU of base station after TD signal for the up base frame solution frame that connected DRU is sent.
14. Remote Radio Unit as claimed in claim 13, is characterized in that, the DRU at different levels in RRU, specifically for being used following formula to calculate the up caching delay value BUF_ul of TD signal in DRU at the corresponding levels
1:
BUF_ul
1=Timing Advance-F
1-F
2-M
3-M
4-L
3-L
4;
Wherein, F
1for the Optical Fiber Transmission time delay value between TD BBU and DAU; F
2for the Optical Fiber Transmission time delay value between DAU and DRU at the corresponding levels; L
3for the forwarded upstream time delay value at the inner TD signal of DAU; L
4forwarded upstream time delay value sum for TD signal in all DRU between DAU and DRU at the corresponding levels; M
3up processing delay value for TD signal in DRU at the corresponding levels; M
4uplink frame alignment time delay value sum for TD signal in all DRU between DAU and DRU at the corresponding levels.
15. Remote Radio Unit as claimed in claim 13, it is characterized in that, each DRU in RRU, specifically for the described setting character carrying in the basis descending base frame receiving, generate the up 5ms frame head of TD signal, and up base frame upper level DRU being sent according to the up 5ms frame head generating aligns with the up base frame frame of changing in DRU at the corresponding levels.
16. Remote Radio Unit as claimed in claim 15, is characterized in that, each DRU in RRU, after the described setting character carrying in receiving descending base frame, determines that the time delay through T_offset is up 5ms frame head; Wherein, T_offset is by following computing formula:
T_offset=2 * Timing Advance-Tdl-Tul;
Wherein, Tdl is the descending overall delay value between BBU and DRU at the corresponding levels; Tul is the up overall delay value between BBU and DRU at the corresponding levels.
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