CN105792236A - Delay acquisition method and device, baseband unit and communication system - Google Patents
Delay acquisition method and device, baseband unit and communication system Download PDFInfo
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- CN105792236A CN105792236A CN201410829277.5A CN201410829277A CN105792236A CN 105792236 A CN105792236 A CN 105792236A CN 201410829277 A CN201410829277 A CN 201410829277A CN 105792236 A CN105792236 A CN 105792236A
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Abstract
The invention provides a delay acquisition method and device, a baseband unit and a communication system. The method comprises the steps of calculating a positive delay of each remote radio unit RRU in a bidirectional ring network link; calculating a negative delay of each RRU in the bidirectional ring network link according to the positive delay; sending the negative delay to the corresponding RRU; and obtaining the negative delay reported by each RRU after the bidirectional ring network link is converted. By adopting the method provided by the invention, before the ring network is converted, the negative delay corresponding to each RRU is obtained according to the positive delay of each RRU in the bidirectional ring network link and is sent to the corresponding RRU, in this way, after the ring network is converted, each RRU can report the pre-obtained negative delay to a BBU, thereby saving the time necessary for the BBU to detect/obtain the time after the link conversion, the conversion can be completed quickly, and the conversion time of each RRU in a ring network mode is greatly shortened.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of based on the time delay acquisition methods in the looped network two-way link of CPRI agreement foundation, device, Base Band Unit and communication system.
Background technology
Using CPRI (CommonPublicRadioInterface, general common radio-frequency interface) agreement sets up in communication system, as used the BBU (BuildingBasebandUnit of CPRI protocol networking, Base Band Unit) and multistage RRU (RadioRemoteUnit, Remote Radio Unit) it is sequentially connected with in the looped network two-way link formed, switching time for RRU at different levels requires more and more higher, and in the art, the time delay that RRU at different levels carry out RRU at different levels according to the flow process that CPRI agreement specifies after link switchover completes obtains, there is time delay in acquisition, looped network is caused to switch speed slow.
Therefore, how to provide a kind of time delay acquiring technology that can be rapidly completed time delay technology after looped network is switched, be those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
The invention provides a kind of time delay acquisition methods, device, Base Band Unit and communication system, it is possible to improve the time delay of RRU at different levels after looped network is switched and obtain speed, and then just can quickly calculate and switch rear reverse optical fiber time delay.
The invention provides the time delay acquisition methods of a kind of looped network two-way link, in one embodiment, comprising: obtain the forward time delay of each radio frequency remote unit RRU in looped network two-way link；The reverse time delay of each RRU in looped network two-way link is obtained according to forward time delay；Reverse time delay is sent to corresponding RRU；After looped network two-way link is switched, obtain each RRU reverse time delay reported.
Further, above-described embodiment, obtaining in looped network two-way link before the reverse time delay of each RRU according to forward time delay, also includes: determine the empty breakpoint of looped network two-way link according to RRU progression in looped network two-way link, obtains the reverse time delay of empty breakpoint；The step of the reverse time delay of each RRU in looped network two-way link is obtained particularly as follows: extend to forward time delay during according to empty breakpoint reverse to obtain the reverse time delay of each RRU in looped network two-way link according to forward time delay.
Further, according to RRU progression in looped network two-way link, above-described embodiment determines that the step of empty breakpoint of looped network two-way link includes: when RRU progression is even number, the RRU of the half progression number being connected with BBU main light port swings to BBU main light port, BBU is swung to from Guang Kou with the RRU of the BBU half progression number being connected from light mouth, when RRU progression is odd number, the round up RRU of number of the half progression being connected with BBU main light port swings to BBU main light port, rounds downwards the RRU of number with BBU from the half progression that light mouth is connected and swings to BBU from Guang Kou；It is defined as empty breakpoint with swinging to the BBU optical fiber from the RRU of light mouth by connecting the RRU swinging to BBU main light port.
Further, in above-described embodiment according to empty breakpoint reverse time extend to forward time delay and obtain the reverse time delay step of each RRU in looped network two-way link and include: according to from the reverse time delay obtaining each RRU with the order of connection of the RRU to the RRU being connected with BBU of empty breakpoint joint successively.
Further, obtaining the step of the reverse time delay of each RRU in looped network two-way link according to forward time delay and including in above-described embodiment: when during by forward, the forward optical-fiber time-delay of Yanzhong corresponding levels RRU and higher level RRU or BBU is defined as reverse Yanzhong corresponding levels RRU and higher level RRU or BBU reverse optical fiber time delay；The vertical shift Toffset (reversely) of the descending input signal in the RRU time delay of Yanzhong and up output signal when the vertical shift Toffset (forward) of the descending input signal in Yanzhong RRU time delay and up output signal is defined as reverse during by forward；Downstream signal input and output time delay TBdelayDL (reversely) in the RRU time delay of Yanzhong when downstream signal input and output time delay TBdelayDL (forward) in Yanzhong RRU time delay is defined as reverse during by forward；The frame head deviation N (reversely) of the upward signal input and output in Yanzhong RRU time delay time reverse is: Toffset (reversely) the ÷ 3.84*1000 of uplink optical fibers time delay (the reversely)-corresponding levels RRU of the Toffset (reversely)+and higher level RRU of downlink optical fiber time delay (the reversely)+higher level RRU of the TBdelayDL (reversely)+and higher level RRU of N (the reversely)=corresponding levels RRU of RRU at the corresponding levels；RRU, after looped network two-way link is switched, reports the N value to be: the N (reversely) of RRU at the corresponding levels rounds up value；Time reverse, upward signal input and output time delay TBdelayUL (reversely) in Yanzhong RRU time delay is: TBdelayUL (reversely)=[N (reversely) of the value-corresponding levels RRU that rounds up of the N (reversely) of RRU at the corresponding levels] ÷ 1000*3.84；RRU is after looped network two-way link is switched, and the TBdelayUL value reported is: the TBdelayUL (reversely) of RRU at the corresponding levels.
The invention provides the time delay acquisition device of a kind of looped network two-way link, in one embodiment, comprising: processor, for obtaining the forward time delay of each radio frequency remote unit RRU in looped network two-way link；The reverse time delay of each RRU in looped network two-way link is obtained according to forward time delay；Communication module, for sending reverse time delay to corresponding RRU, after looped network two-way link is switched, obtains each RRU reverse time delay reported.
Further, the processor in above-described embodiment is additionally operable to, obtaining in looped network two-way link before the reverse time delay of each RRU according to forward time delay, determine the empty breakpoint of looped network two-way link according to RRU progression in looped network two-way link, obtain the reverse time delay of empty breakpoint；Extend to forward time delay during according to empty breakpoint reverse and obtain the reverse time delay of each RRU in looped network two-way link.
Further, processor in above-described embodiment is specifically for when RRU progression is even number, the RRU of the half progression number being connected with BBU main light port swings to BBU main light port, BBU is swung to from Guang Kou with the RRU of the BBU half progression number being connected from light mouth, when RRU progression is odd number, the round up RRU of number of the half progression being connected with BBU main light port swings to BBU main light port, rounds downwards the RRU of number with BBU from the half progression that light mouth is connected and swings to BBU from Guang Kou；It is defined as empty breakpoint with swinging to the BBU optical fiber from the RRU of light mouth by connecting the RRU swinging to BBU main light port.
Further, the processor in above-described embodiment is specifically for according to from the reverse time delay obtaining each RRU with the order of connection of the RRU to the RRU being connected with BBU of empty breakpoint joint successively.
Further, the processor in above-described embodiment is specifically for the reverse optical fiber time delay of Yanzhong when the forward optical-fiber time-delay of Yanzhong is defined as reverse during by forward；The vertical shift Toffset (reversely) of the descending input signal in the RRU time delay of Yanzhong and up output signal when the vertical shift Toffset (forward) of the descending input signal in Yanzhong RRU time delay and up output signal is defined as reverse during by forward；Downstream signal input and output time delay TBdelayDL (reversely) in the RRU time delay of Yanzhong when downstream signal input and output time delay TBdelayDL (forward) in Yanzhong RRU time delay is defined as reverse during by forward；The frame head deviation N (reversely) of the upward signal input and output in Yanzhong RRU time delay time reverse is: Toffset (reversely) the ÷ 3.84*1000 of uplink optical fibers time delay (the reversely)-corresponding levels RRU of the Toffset (reversely)+and higher level RRU of downlink optical fiber time delay (the reversely)+higher level RRU of the TBdelayDL (reversely)+and higher level RRU of N (the reversely)=corresponding levels RRU of RRU at the corresponding levels；Time reverse, upward signal input and output time delay TBdelayUL (reversely) in Yanzhong RRU time delay is: TBdelayUL (reversely)=[N (reversely) of the value-corresponding levels RRU that rounds up of the N (reversely) of RRU at the corresponding levels] ÷ 1000*3.84.
The invention provides a kind of Base Band Unit, it includes time delay acquisition device provided by the invention.
The invention provides a kind of communication system, it includes Base Band Unit provided by the invention and multistage RRU, and multistage RRU is sequentially connected with by CPRI interface, forms looped network two-way link with Base Band Unit.
Beneficial effects of the present invention:
Scheme provided by the invention, before looped network is switched, forward time delay according to RRU at different levels in looped network two-way link obtains the reverse time delay that each RRU is corresponding, and send it to the RRU of correspondence, so, after looped network is switched, the reverse time delay that RRU at different levels just can will obtain before, BBU is reported particularly in the N value and TBdelayUL value that can send change after link switchover, save BBU and detect/obtain the N value after link switchover and TBdelayUL value required time, can be rapidly completed and switch, the switching time of RRU at different levels under looped network pattern there is great shortening, the switching performance of RRU at different levels under looped network pattern is also had greatly improved.
Accompanying drawing explanation
The flow chart of the time delay acquisition methods that Fig. 1 provides for first embodiment of the invention；
The schematic diagram of the time delay acquisition device that Fig. 2 provides for second embodiment of the invention；
The structure chart of the communication system that Fig. 3 provides for third embodiment of the invention；
Fig. 4 be in third embodiment of the invention communication system switch after frame head sequential chart；
Fig. 5 is the structure chart of communication system in fourth embodiment of the invention；
The flow chart of the time delay acquisition methods that Fig. 6 provides for fourth embodiment of the invention.
Detailed description of the invention
Now in conjunction with the mode of accompanying drawing the present invention made by detailed description of the invention and further annotate explanation.
Forward time delay involved by the application refers to when looped network two-way link is switched, the time delay of RRU at different levels, after reverse time delay refers to that looped network two-way link is switched, and the time delay of RRU at different levels；The application completes the acquisition of reverse time delay before switching, if so looped network is switched, RRU at different levels just can quick obtaining time delay (reverse time delay), various adjustment after completing to switch, shorten switching time.
First embodiment:
The flow chart of the time delay acquisition methods that Fig. 1 provides for first embodiment of the invention, as shown in Figure 1, in the present embodiment, time delay acquisition methods provided by the invention comprises the following steps:
S101: calculate the forward time delay of each radio frequency remote unit RRU in looped network two-way link；
S102: according to the reverse time delay of each RRU in forward time-delay calculation looped network two-way link；
S103: reverse time delay is sent to corresponding RRU；
S104: after looped network two-way link is switched, obtains each RRU reverse time delay reported；After such BBU just can quickly finish link switchover, the reverse optical fiber time delay of RRU at different levels.
In certain embodiments, embodiment illustrated in fig. 1 before according to the reverse time delay of each RRU in forward time-delay calculation looped network two-way link, also includes: determine the empty breakpoint of looped network two-way link according to RRU progression in looped network two-way link, calculates the reverse time delay of empty breakpoint；According to the step of the reverse time delay of each RRU in forward time-delay calculation looped network two-way link particularly as follows: extend to the reverse time delay of each RRU in forward time-delay calculation looped network two-way link during according to empty breakpoint reverse.
In certain embodiments, according to RRU progression in looped network two-way link, above-described embodiment determines that the step of empty breakpoint of looped network two-way link includes: when RRU progression is even number, the RRU of the half progression number being connected with BBU main light port swings to BBU main light port, BBU is swung to from Guang Kou with the RRU of the BBU half progression number being connected from light mouth, when RRU progression is odd number, the round up RRU of number of the half progression being connected with BBU main light port swings to BBU main light port, rounds downwards the RRU of number with BBU from the half progression that light mouth is connected and swings to BBU from Guang Kou；It is defined as empty breakpoint with swinging to the BBU optical fiber from the RRU of light mouth by connecting the RRU swinging to BBU main light port.
In certain embodiments, in above-described embodiment according to empty breakpoint reverse time extend to the reverse time delay step of each RRU in forward time-delay calculation looped network two-way link and include: according to from the reverse time delay calculating each RRU with the order of connection of the RRU to the RRU being connected with BBU of empty breakpoint joint successively.
In certain embodiments, including according to the step of the reverse time delay of each RRU in forward time-delay calculation looped network two-way link in above-described embodiment: when during by forward, the forward optical-fiber time-delay of Yanzhong corresponding levels RRU and higher level RRU or BBU is defined as reverse Yanzhong corresponding levels RRU and higher level RRU or BBU reverse optical fiber time delay；The vertical shift Toffset (reversely) of the descending input signal in the RRU time delay of Yanzhong and up output signal when the vertical shift Toffset (forward) of the descending input signal in Yanzhong RRU time delay and up output signal is defined as reverse during by forward；Downstream signal input and output time delay TBdelayDL (reversely) in the RRU time delay of Yanzhong when downstream signal input and output time delay TBdelayDL (forward) in Yanzhong RRU time delay is defined as reverse during by forward；The frame head deviation N (reversely) of the upward signal input and output in Yanzhong RRU time delay time reverse is: Toffset (reversely) the ÷ 3.84*1000 of uplink optical fibers time delay (the reversely)-corresponding levels RRU of the Toffset (reversely) of downlink optical fiber time delay (the reversely)+higher level RRU of the TBdelayDL (reversely) of the N (reversely) of these corresponding levels RRU=corresponding levels RRU+and higher level RRU+and higher level RRU；RRU, after looped network two-way link is switched, reports the N value to be: the N (reversely) of RRU at the corresponding levels rounds up value；Time reverse, upward signal input and output time delay TBdelayUL (reversely) in Yanzhong RRU time delay is: TBdelayUL (reversely)=[N (reversely) of the value-corresponding levels RRU that rounds up of the N (reversely) of RRU at the corresponding levels] ÷ 1000*3.84；RRU is after looped network two-way link is switched, and the TBdelayUL value reported is: the TBdelayUL (reversely) of RRU at the corresponding levels.
Second embodiment:
The schematic diagram of the time delay acquisition device that Fig. 2 provides for second embodiment of the invention, as shown in Figure 2, in the present embodiment, time delay acquisition device 2 provided by the invention includes processor 21 and communication module 22, wherein,
Processor 21 is for obtaining the forward time delay of each radio frequency remote unit RRU in looped network two-way link；The reverse time delay of each RRU in looped network two-way link is obtained according to forward time delay；
Communication module 22, for sending reverse time delay to corresponding RRU, after looped network two-way link is switched, obtains each RRU reverse time delay reported.
In certain embodiments, processor 21 in embodiment illustrated in fig. 2 is additionally operable to before according to the reverse time delay of each RRU in forward time-delay calculation looped network two-way link, determine the empty breakpoint of looped network two-way link according to RRU progression in looped network two-way link, calculate the reverse time delay of empty breakpoint；The reverse time delay of each RRU in forward time-delay calculation looped network two-way link is extended to during according to empty breakpoint reverse.
In certain embodiments, processor 21 in embodiment illustrated in fig. 2 is specifically for when RRU progression is even number, the RRU of the half progression number being connected with BBU main light port swings to BBU main light port, BBU is swung to from Guang Kou with the RRU of the BBU half progression number being connected from light mouth, when RRU progression is odd number, the round up RRU of number of the half progression being connected with BBU main light port swings to BBU main light port, rounds downwards the RRU of number with BBU from the half progression that light mouth is connected and swings to BBU from Guang Kou；It is defined as empty breakpoint with swinging to the BBU optical fiber from the RRU of light mouth by connecting the RRU swinging to BBU main light port.
In certain embodiments, the processor 21 in embodiment illustrated in fig. 2 is specifically for according to from the reverse time delay calculating each RRU with the order of connection of the RRU to the RRU being connected with BBU of empty breakpoint joint successively.
In certain embodiments, the processor 21 in embodiment illustrated in fig. 2 is specifically for the reverse optical fiber time delay of Yanzhong when the forward optical-fiber time-delay of Yanzhong is defined as reverse during by forward；The vertical shift Toffset (reversely) of the descending input signal in the RRU time delay of Yanzhong and up output signal when the vertical shift Toffset (forward) of the descending input signal in Yanzhong RRU time delay and up output signal is defined as reverse during by forward；Downstream signal input and output time delay TBdelayDL (reversely) in the RRU time delay of Yanzhong when downstream signal input and output time delay TBdelayDL (forward) in Yanzhong RRU time delay is defined as reverse during by forward；The frame head deviation N (reversely) of the upward signal input and output in Yanzhong RRU time delay time reverse is:: Toffset (reversely) the ÷ 3.84*1000 of uplink optical fibers time delay (the reversely)-corresponding levels RRU of the Toffset (reversely)+and higher level RRU of downlink optical fiber time delay (the reversely)+higher level RRU of the TBdelayDL (reversely)+and higher level RRU of N (the reversely)=corresponding levels RRU of RRU at the corresponding levels；Time reverse, upward signal input and output time delay TBdelayUL (reversely) in Yanzhong RRU time delay is: TBdelayUL (reversely)=[N (reversely) of the value-corresponding levels RRU that rounds up of the N (reversely) of RRU at the corresponding levels] ÷ 1000*3.84.
The invention provides a kind of Base Band Unit, it includes time delay acquisition device provided by the invention.
The invention provides a kind of communication system, it includes Base Band Unit provided by the invention and multistage RRU, and multistage RRU is sequentially connected with by CPRI interface, forms looped network two-way link with Base Band Unit.
3rd embodiment:
Securing mechanism provided by the present invention is mainly carried out annotating illustrating by the present embodiment, specific as follows:
In conjunction with in Fig. 3 shown in (A), the implication of the parameter involved by the application being illustrated:
T12 is the optical-fiber time-delay of downlink, T34 is the optical-fiber time-delay of up-link, T14 is that up-downgoing connects signal frame-frequency side-play amount, Toffset is the vertical shift of descending input signal RB2 and up output signal RB3 in RRU, TBdelayDL is downstream signal time delay of RB2 and RB1 in RRU, TBdelayDL is upward signal time delay of RB4 and RB3 in RRU, N is the deviation of the frame header position at the upward signal RB3 place frame header position relative to RB4, and the unit of N is basic frame (1/3.84Mhz)；
In conjunction with in Fig. 3 shown in (B), by the optical-fiber time-delay measurement procedure of forward, it is possible to obtain the latency measurement parameter values such as TBdelayDL (RRU1 forward), TBdelayDL (RRU2 forward), T12 forward, Toffset (RRU2 forward), T34 forward, TbdelayUL (RRU1 forward), TbdelayUL (RRU2 forward), N (RRU1 forward), N (RRU2 forward)
When switching, in reverse latency measurement parameter such as Fig. 3 of RRU at different levels shown in the dotted arrow of (B)；RRU switch after reverse time delay frame head sequential chart as shown in Figure 4:
Below equation can be obtained in conjunction with Fig. 3 and Fig. 4:
N (RRU2 is reverse)+Toffset (RRU2 is reverse)=TBdelayDL (RRU2 is reverse)+T12 (reversely)+Toffset (RRU1 is reverse)+T34 (reversely)+TBdelayUL (RRU2 is reverse)；Further, can be derived from:
N (RRU2 is reverse)-TBdelayUL (RRU2 is reverse)=TBdelayDL (RRU2 is reverse)+T12 (reversely)+Toffset (RRU1 is reverse)+T34 (reversely)-Toffset (RRU2 is reverse)；
Due to T12 reversely=T12 forward, T34 reversely=T34 forward, and T12 forward, T34 forward are given value, Toffset (RRU1 is reverse), TBdelayDL (RRU2 is reverse), Toffset (RRU2 is reverse) are fixed value, corresponding forward value is identical, and obtains；
And the integral multiple that N (RRU2 is reverse) is 1/3.84Mhz, TBdelayUL (RRU2) is reversed the value less than 1/3.84Mhz；Then can know by inference:
N (RRU2 is reverse)=[TBdelayDL (RRU2 is reverse)+T12 (reversely)+Toffset (RRU1 is reverse)+T34 (reversely)-Toffset (RRU2 is reverse)] ÷ 3.84*1000；Owing to the actual N value unit reported is 3.84Mhz, so the actual N value that reports is: the value that rounds up of N (RRU2 is reverse)；
TBdelayUL (RRU2 is reverse)=[value-N (RRU2 is reverse) that rounds up of N (RRU2 is reverse)] ÷ 1000*3.84；Unit: ns.
4th embodiment:
In conjunction with concrete application example the present invention done and further annotate explanation, in this embodiment it is assumed that BBUR and 5 RRU forms looped network two-way link, as shown in Figure 5, the definition of various parameters is identical with the 3rd embodiment, and empty breakpoint is the optical fiber after No. 3 RRU and No. 4 RRU；It will be appreciated from fig. 6 that in the present embodiment, time delay acquisition methods provided by the invention comprises the following steps:
S601:BBU initiates the optical-fiber time-delay measurement procedure in main light port, calculates RRU1, RRU2, RRU3 optical-fiber time-delay on first-selected light mouth；Specifically include procedure below:
Calculate the fiber lengths of RRU1:
T12 (No. 1 RRU forward)=T34 (No. 1 RRU forward)=[T14 (BBU light mouth 0)-Toffset (No. 1 RRU forward)]/2；
T12 (1)=T12 (No. 1 RRU forward), T34 (1)=T34 (No. 1 RRU forward)
Calculate the fiber lengths of RRU2:
T12 (No. 2 RRU forwards)=[T14 (BBU light mouth 0)+N (No. 1 RRU forward) Toffset (No. 2 RRU forwards)+TBdelayDL (No. 1 RRU forward) TBdelayUL (No. 1 RRU forward)]/2；
T34 (No. 2 RRU forwards)=[T14 (BBU light mouth 0)+N (No. 1 RRU forward) Toffset (No. 2 RRU forwards)-TBdelayDL (No. 1 RRU forward)+TBdelayUL (No. 1 RRU forward)]/2；
T12 (2)=T12 (No. 2 RRU forwards)-T12 (No. 1 RRU forward)-TBdelayDL (No. 1 RRU forward)；
T34 (2)=T34 (No. 2 RRU forwards)-T34 (No. 1 RRU forward) [N (No. 1 RRU forward)-TBdelayUL (No. 1 RRU forward)]；
Calculate the fiber lengths of RRU3:
T12 (No. 3 RRU forwards)=[T14 (BBU light mouth 0)+N (No. 1 RRU forward)+N (No. 2 RRU forwards)-Toffset (No. 3 RRU forwards)+TBdelayDL (No. 1 RRU forward)+TBdelayDL (No. 2 RRU forwards)-TBdelayUL (No. 1 RRU forward)-TBdelayUL (No. 2 RRU forwards)]/2；
T34 (No. 3 RRU forwards)=[T14 (BBU light mouth 0)+N (No. 1 RRU forward)+N (No. 2 RRU forwards)-Toffset (No. 3 RRU forwards)-TBdelayDL (No. 1 RRU forward)-TBdelayDL (No. 2 RRU forwards)+TBdelayUL (No. 1 RRU forward)+TBdelayUL (No. 2 RRU forwards)]/2；
T12 (3)=T12 (No. 3 RRU forwards) T12 (No. 2 RRU forwards) TBdelayDL (No. 2 RRU forwards)；
T34 (3)=T34 (No. 3 RRU forwards) T34 (No. 2 RRU forwards) [N (No. 2 RRU forwards)-TBdelayUL (No. 2 RRU forwards)]；
S602:BBU initiates, from the optical-fiber time-delay measurement procedure light mouth, to calculate RRU5, RRU4 optical-fiber time-delay on first-selected light mouth；Specifically include following steps:
Calculate the fiber lengths of RRU5:
T12 (No. 5 RRU forwards)=T34 (No. 5 RRU forwards)=[T14 (BBU light mouth 1) Toffset (No. 5 RRU forwards)]/2；
T12 (6)=T12 (No. 5 RRU forwards), T34 (6)=T34 (No. 5 RRU forwards)；
Calculate the fiber lengths of RRU4:
T12 (No. 4 RRU forwards)=[T14 (BBU light mouth 1)+N (No. 5 RRU forwards) Toffset (No. 4 RRU forwards)+TBdelayDL (No. 5 RRU forwards) TBdelayUL (No. 5 RRU forwards)]/2；
T34 (No. 4 RRU forwards)=[T14 (BBU light mouth 1)+N (No. 5 RRU forwards) Toffset (No. 4 RRU forwards) TbdelayDL (No. 5 RRU forwards)+TBdelayUL (No. 5 RRU forwards)]/2；
T12 (5)=T12 (No. 4 RRU forwards)-T12 (No. 5 RRU forwards) TbdelayDL (No. 5 RRU forwards)；
T34 (5)=T34 (No. 4 RRU forwards)-T34 (No. 5 RRU forwards) [N (No. 5 RRU forwards) TBdelayUL (No. 5 RRU forwards)]；
S603:BBU initiates the optical-fiber time-delay measurement that empty breakpoint goes out in main light port；Specifically include:
Short circuit RRU4；The second line of a couplet light mouth of RRU4 receives CPRI frame head and is looped back to transmission CPRI frame head and the delay value that loopback is arranged, and is set to Toffset initial default value；
S604:BBU initiates the reverse optical fiber latency measurement flow process in main light port, calculates the reverse optical fiber time delay of RRU1, RRU2, RRU3；Specifically include following steps:
Inquiry RRU4 delay parameter: Toffset (No. 4 RRU forwards), TbdelayDL (No. 4 RRU forwards), TBdelayUL (No. 4 RRU forwards), N (No. 4 RRU forwards)；
Computing redundancy optical fiber T12 (4):
T12 (4)=T34 (4)=[N (No. 3 RRU forwards)+Toffset (No. 3 RRU forwards) TBdelayUL (No. 3 RRU forwards) TbdelayDL (No. 3 RRU forwards) Toffset (No. 4 RRU are reverse)]/2
Calculate the reverse time delay of RRU2:
N (No. 2 RRU are reverse)=[TBdelayDL (No. 3 RRU are reverse)+T12 (3)+Toffset (No. 2 RRU are reverse)+T34 (3) Toffset (No. 2 RRU are reverse)] ÷ 3.84*1000；N (No. 2 RRU are reverse) is sent to RRU2, RRU2 after looped network is switched by BBU, reports BBU after being rounded up by N (No. 2 RRU are reverse), and unit is 1/3.84Mhz；
TBdelayUL (No. 2 RRU are reverse)=N (No. 2 RRU are reverse)/3.84-[TBdelayDL (No. 3 RRU are reverse)+T12 (3)+Toffset (No. 2 RRU are reverse)+T34 (3) Toffset (No. 2 RRU are reverse)] ÷ 1000*3.84, unit: ns；
Calculate the reverse time delay of RRU1:
N (No. 1 RRU is reverse)=[TBdelayDL (No. 2 RRU are reverse)+T12 (2)+Toffset (No. 1 RRU is reverse)+T34 (2) Toffset (No. 1 RRU is reverse)] ÷ 3.84*1000；N (No. 1 RRU is reverse) is sent to RRU1, RRU1 after looped network is switched by BBU, reports BBU, unit: 1/3.84Mhz after being rounded up by N (No. 1 RRU is reverse)；
TBdelayUL (No. 1 RRU is reverse)=N (No. 1 RRU is reverse)/3.84-[TBdelayDL (No. 2 RRU are reverse)+T12 (2)+Toffset (No. 1 RRU is reverse)+T34 (2) Toffset (No. 1 RRU is reverse)] ÷ 1000*3.84, unit: ns；
S605:BBU initiates, from the reverse optical fiber latency measurement flow process light mouth, to calculate the reverse optical fiber time delay of RRU5, RRU4；Specifically include following steps:
Inquiry RRU3 delay parameter: Toffset (No. 3 RRU forwards), TbdelayDL (No. 3 RRU forwards), TBdelayUL (No. 3 RRU forwards), N (No. 3 RRU forwards)；
Computing redundancy optical fiber:
The slack result calculated before can directly using, it is also possible to recalculate:
T12 (4)=T34 (4)=[N (No. 4 RRU forwards)+Toffset (No. 4 RRU forwards)-TBdelayUL (No. 4 RRU forwards) TbdelayDL (No. 4 RRU forwards) Toffset (No. 3 RRU are reverse)]/2；
Calculate the reverse time delay of RRU4:
N (No. 4 RRU are reverse)=[TBdelayDL (No. 3 RRU are reverse)+T12 (4)+Toffset (No. 4 RRU are reverse)+T34 (4) Toffset (No. 3 RRU are reverse)] ÷ 3.84*1000；N (No. 4 RRU are reverse) is sent to RRU4, RRU4 after looped network is switched by BBU, reports BBU, unit: 1/3.84Mhz after being rounded up by N (No. 4 RRU are reverse)；
TBdelayUL (No. 4 RRU are reverse)=N (No. 4 RRU are reverse)/3.84-[TBdelayDL (No. 3 RRU are reverse)+T12 (4)+Toffset (No. 4 RRU are reverse)+T34 (4) Toffset (No. 3 RRU are reverse)] ÷ 1000*3.84, unit: ns；
Calculate the reverse time delay of RRU5:
N (No. 5 RRU are reverse)=[TBdelayDL (No. 4 RRU are reverse)+T12 (5)+Toffset (No. 5 RRU are reverse)+T34 (5) Toffset (No. 4 RRU are reverse)] ÷ 3.84*1000；N (No. 5 RRU are reverse) is sent to RRU5, RRU5 after looped network is switched by BBU, reports BBU after being rounded up by N (No. 5 RRU are reverse)；Unit: 1/3.84Mhz；
TBdelayUL (No. 5 RRU are reverse)=N (No. 5 RRU are reverse)/3.84-[TBdelayDL (No. 4 RRU are reverse)+T12 (5)+Toffset (No. 5 RRU are reverse)+T34 (5) Toffset (No. 4 RRU are reverse)] ÷ 1000*3.84, unit: ns；
S606:BBU is extended down to corresponding RRU when sending reverse；
So, after link switchover, the reverse delay parameter of its correspondence just can quickly be sent to BBU, BBU by RRU just can complete the operations such as follow-up frame head adjustment, it is possible to is rapidly completed and switches.
In summary, by the enforcement of the present invention, at least there is following beneficial effect:
Before looped network is switched, forward time delay according to RRU at different levels in looped network two-way link obtains the reverse time delay that each RRU is corresponding, and send it to the RRU of correspondence, so, after looped network is switched, the reverse time delay that RRU at different levels just can will obtain before, BBU is reported particularly in the N value and TBdelayUL value that can send change after link switchover, save BBU and detect/obtain the N value after link switchover and TBdelayUL value required time, can be rapidly completed and switch, the switching time of RRU at different levels under looped network pattern there is great shortening, the switching performance of RRU at different levels under looped network pattern is also had greatly improved.
Below it is only the specific embodiment of the present invention; not the present invention is done any pro forma restriction; every any simple modification, equivalent variations, combination or modification embodiment of above done according to the technical spirit of the present invention, all still falls within the protection domain of technical solution of the present invention.
Claims (12)
1. the time delay acquisition methods of a looped network two-way link, it is characterised in that including:
Calculate the forward time delay of each radio frequency remote unit RRU in described looped network two-way link；
The reverse time delay of each RRU in looped network two-way link according to described forward time-delay calculation；
Described reverse time delay is sent to corresponding RRU；
After described looped network two-way link is switched, obtain each RRU described reverse time delay reported.
2. time delay acquisition methods as claimed in claim 1, it is characterized in that, in looped network two-way link according to described forward time-delay calculation before the reverse time delay of each RRU, also include: determine the empty breakpoint of described looped network two-way link according to RRU progression in described looped network two-way link, calculate the reverse time delay of described empty breakpoint；In described looped network two-way link according to described forward time-delay calculation, the step of the reverse time delay of each RRU is particularly as follows: extend to the reverse time delay of each RRU in looped network two-way link described in described forward time-delay calculation during according to described empty breakpoint reverse.
3. time delay acquisition methods as claimed in claim 2, it is characterized in that, described determine that the step of the empty breakpoint of described looped network two-way link includes according to RRU progression in described looped network two-way link: when described RRU progression is even number, the RRU of the half progression number being connected with BBU main light port swings to described BBU main light port, described BBU is swung to from Guang Kou with the RRU of the BBU half progression number being connected from light mouth, when described RRU progression is odd number, the round up RRU of number of the half progression being connected with BBU main light port swings to described BBU main light port, round downwards the RRU of number with BBU from the half progression that light mouth is connected and swing to described BBU from Guang Kou；It is defined as empty breakpoint with swinging to the described BBU optical fiber from the RRU of light mouth by connecting the RRU swinging to described BBU main light port.
4. time delay acquisition methods as claimed in claim 2, it is characterized in that, described according to described empty breakpoint reverse time extend to the reverse time delay step of each RRU in looped network two-way link described in described forward time-delay calculation and include: according to from the reverse time delay calculating each RRU with the order of connection of the RRU to the RRU being connected with BBU of described empty breakpoint joint successively.
5. the time delay acquisition methods as described in any one of Claims 1-4, it is characterised in that in described looped network two-way link according to described forward time-delay calculation, the step of the reverse time delay of each RRU includes:
During by described forward the forward optical-fiber time-delay of Yanzhong corresponding levels RRU and higher level RRU or BBU be defined as described reverse time Yanzhong corresponding levels RRU and higher level RRU or BBU reverse optical fiber time delay；During by described forward the vertical shift Toffset (forward) of the descending input signal in Yanzhong RRU time delay and up output signal be defined as described reverse time Yanzhong RRU time delay in the vertical shift Toffset (reversely) of descending input signal and up output signal；During by described forward downstream signal input and output time delay TBdelayDL (forward) in Yanzhong RRU time delay be defined as described reverse time Yanzhong RRU time delay in downstream signal input and output time delay TBdelayDL (reversely)；
Described reverse time Yanzhong RRU time delay in the frame head deviation N (reversely) of upward signal input and output be: Toffset (reversely) the ÷ 3.84*1000 of uplink optical fibers time delay (the reversely)-corresponding levels RRU of the Toffset (reversely)+and higher level RRU of downlink optical fiber time delay (the reversely)+higher level RRU of the TBdelayDL (reversely)+and higher level RRU of N (the reversely)=corresponding levels RRU of RRU at the corresponding levels；RRU, after described looped network two-way link is switched, reports the N value to be: the N (reversely) of described RRU at the corresponding levels rounds up value；
Described reverse time Yanzhong RRU time delay in upward signal input and output time delay TBdelayUL (reversely) be: TBdelayUL (reversely)=[N (reversely) of the value-corresponding levels RRU that rounds up of the N (reversely) of RRU at the corresponding levels] ÷ 1000*3.84；RRU is after described looped network two-way link is switched, and the TBdelayUL value reported is: the TBdelayUL (reversely) of described RRU at the corresponding levels.
6. the time delay acquisition device of a looped network two-way link, it is characterised in that including:
Processor, for calculating the forward time delay of each radio frequency remote unit RRU in described looped network two-way link；The reverse time delay of each RRU in looped network two-way link according to described forward time-delay calculation；
Communication module, for sending described reverse time delay to corresponding RRU, after described looped network two-way link is switched, obtains each RRU described reverse time delay reported.
7. time delay acquisition device as claimed in claim 6, it is characterized in that, described processor is additionally operable in looped network two-way link according to described forward time-delay calculation before the reverse time delay of each RRU, determine the empty breakpoint of described looped network two-way link according to RRU progression in described looped network two-way link, calculate the reverse time delay of described empty breakpoint；The reverse time delay of each RRU in looped network two-way link described in described forward time-delay calculation is extended to during according to described empty breakpoint reverse.
8. time delay acquisition device as claimed in claim 7, it is characterized in that, described processor is specifically for when described RRU progression is even number, the RRU of the half progression number being connected with BBU main light port swings to described BBU main light port, described BBU is swung to from Guang Kou with the RRU of the BBU half progression number being connected from light mouth, when described RRU progression is odd number, the round up RRU of number of the half progression being connected with BBU main light port swings to described BBU main light port, rounds downwards the RRU of number with BBU from the half progression that light mouth is connected and swings to described BBU from Guang Kou；It is defined as empty breakpoint with swinging to the described BBU optical fiber from the RRU of light mouth by connecting the RRU swinging to described BBU main light port.
9. time delay acquisition device as claimed in claim 7, it is characterised in that described processor is specifically for according to from the reverse time delay calculating each RRU with the order of connection of the RRU to the RRU being connected with BBU of described empty breakpoint joint successively.
10. the time delay acquisition device as described in any one of claim 6 to 9, it is characterised in that described processor specifically for:
During by described forward the forward optical-fiber time-delay of Yanzhong be defined as described reverse time Yanzhong reverse optical fiber time delay；During by described forward the vertical shift Toffset (forward) of the descending input signal in Yanzhong RRU time delay and up output signal be defined as described reverse time Yanzhong RRU time delay in the vertical shift Toffset (reversely) of descending input signal and up output signal；During by described forward downstream signal input and output time delay TBdelayDL (forward) in Yanzhong RRU time delay be defined as described reverse time Yanzhong RRU time delay in downstream signal input and output time delay TBdelayDL (reversely)；
Described reverse time Yanzhong RRU time delay in the frame head deviation N (reversely) of upward signal input and output be: Toffset (reversely) the ÷ 3.84*1000 of uplink optical fibers time delay (the reversely)-corresponding levels RRU of the Toffset (reversely)+and higher level RRU of downlink optical fiber time delay (the reversely)+higher level RRU of the TBdelayDL (reversely)+and higher level RRU of N (the reversely)=corresponding levels RRU of RRU at the corresponding levels；
Described reverse time Yanzhong RRU time delay in upward signal input and output time delay TBdelayUL (reversely) be: TBdelayUL (reversely)=[N (reversely) of the value-corresponding levels RRU that rounds up of the N (reversely) of RRU at the corresponding levels] ÷ 1000*3.84.
11. a Base Band Unit, it is characterised in that include the time delay acquisition device as described in any one of claim 6 to 10.
12. a communication system, it is characterised in that including Base Band Unit as claimed in claim 11 and multistage RRU, described multistage RRU is sequentially connected with by CPRI interface, form looped network two-way link with described Base Band Unit.
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