CN114143384A - CPRI and ECPRI protocol data fusion transmission method - Google Patents
CPRI and ECPRI protocol data fusion transmission method Download PDFInfo
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Abstract
The invention relates to a CPRI and ECPRI protocol data fusion transmission method, which comprises the following steps: step S1: the method comprises the steps of obtaining CPRI protocol data of 4G signals and ECPRI protocol data of 5G signals in real time, wherein in a CPRI synchronous transmission protocol, data transmission is transmitted by taking a data block as a unit, and in an ECPRI asynchronous transmission protocol, data transmission is transmitted by dividing bits into small groups; step S2: according to the judgment of the signal priority, the hysteresis degree of the 4G signal and the 5G signal is balanced, the CPRI protocol data of the 4G signal and the ECPRI protocol data of the 5G signal are fused, and the transmission resources are applied to the maximum extent on the basis of balancing the transmission efficiency of the two protocol data. The invention adopts 5G +4G dual-mode base station equipment, can simultaneously forward CPRI and ECPRI protocol data in the transmission bandwidth of a 10G optical module, saves forward bandwidth resources, reduces the construction cost of a 5G +4G network, improves the transmission efficiency, and maximally applies transmission resources on the basis of balancing the transmission efficiency of the two protocol data.
Description
Technical Field
The application relates to the technical field of communication protocols, in particular to a data fusion transmission method of CPRI and ECPRI protocols.
Background
With the development of a 5G communication network, the carrier bandwidth and the number of antennas are greatly increased, the data volume transmitted between a BBU and an RRU is rapidly increased, meanwhile, the 5G network and a 4G network are constructed in a co-station manner, more and more situations exist when a 5G +4G dual-mode base station device is used, the current high-speed optical module cannot give consideration to the dual-mode transmission data flow of the 5G +4G, the separate transmission cost is high, the 5G network communication protocol mainly adopts ECPRI, the 4G network communication protocol mainly adopts CPRI, and the two protocols are incompatible, so that the data transmission efficiency between the 5G +4G dual-mode base station device is low and the cost is high.
Disclosure of Invention
Aiming at the problems, the invention provides a method for fusing and transmitting CPRI (common public radio interface) and ECPRI (Internet protocol redundancy protocol), which mainly adopts a CPRI and ECPRI protocol data merging and transmitting technology, can realize data transmission between 5G +4G dual-mode base station equipment in a 10G transmission bandwidth, shares forward transmission resources, improves transmission efficiency, reduces transmission cost and ensures the transmission cost at the same time, and comprises the following steps:
step S1: the method comprises the steps of obtaining CPRI protocol data of 4G signals and ECPRI protocol data of 5G signals in real time, wherein in a CPRI synchronous transmission protocol, data transmission is transmitted by taking a data block as a unit, and in an ECPRI asynchronous transmission protocol, data transmission is transmitted by dividing bits into small groups;
step S2: according to the judgment of the signal priority, the hysteresis degree of the 4G signal and the 5G signal is balanced, the CPRI protocol data of the 4G signal and the ECPRI protocol data of the 5G signal are fused, and the transmission resources are applied to the maximum extent on the basis of balancing the transmission efficiency of the two protocol data.
Has the advantages that:
(1) the invention adopts 5G +4G dual-mode base station equipment, can simultaneously forward transfer CPRI and ECPRI protocol data in the transmission bandwidth of a 10G optical module, saves forward transfer bandwidth resources, reduces the construction cost of a 5G +4G network and improves the transmission efficiency.
(2) The invention fuses the ECPRI of 5G and the CPRI protocol data of 4G, and applies transmission resources to the maximum extent on the basis of balancing the transmission efficiency of the two protocol data.
Drawings
Fig. 1 is a schematic diagram of a data frame structure of a CPRI interface protocol of a 4G network base station in a CPRI and ECPRI protocol data fusion transmission method provided by the present invention.
Fig. 2 is a schematic diagram of a data frame structure of an ECPRI interface protocol of a 5G network base station in a CPRI and ECPRI protocol data fusion transmission method provided by the present invention.
Fig. 3 is a schematic diagram of 4G CPRI protocol data in a CPRI and ECPRI protocol data fusion transmission method provided by the present invention.
Fig. 4 is a schematic diagram of compressing and merging CPRI and ECPRI protocol data in a method for fusion transmission of CPRI and ECPRI protocol data according to the present invention.
Detailed Description
In order to make the invention more comprehensible to those skilled in the art, the invention is described below with reference to the following embodiments and the accompanying drawings, in which reference is made to fig. 1 to 4.
In order to realize the content, the invention designs a method for fusing and transmitting CPRI and ECPRI protocol data, which comprises the following steps:
step S1: the method comprises the steps of obtaining CPRI protocol data of 4G signals and ECPRI protocol data of 5G signals in real time, wherein in a CPRI synchronous transmission protocol, data transmission is transmitted by taking a data block as a unit, and in an ECPRI asynchronous transmission protocol, data transmission is transmitted by dividing bits into small groups;
the purpose of the step is to obtain CPRI protocol data and eCPRI protocol data transferred between 5G +4G dual-mode base station equipment.
It should be noted that, currently, the common use of the base station device of the 4G network is the CPRI interface protocol, and the data frame structure is shown in fig. 1. The CPRI protocol is a protocol for synchronous transmission, and the frame structure of forwarding data is fixed and is a timing transmission. In the CPRI synchronous transmission protocol, data is transmitted in units of data blocks, each data block is composed of a series of words, and these data blocks are called data frames.
It should be noted that the data frame stores valid information, and the longer the bit of the valid information is, the larger the buffer area required for buffering data is, which limits the size of a data frame. In addition, the larger the data frame, the longer the continuous time it takes to occupy the transmission medium. In the process of synchronous transmission, the receiving party needs to wait for the data to finish other operations.
The current 5G network base station equipment commonly uses the ECPRI interface protocol, and the data frame structure is shown in fig. 2. The ECPRI protocol is an asynchronous transmission protocol, and the frame structure of forwarding data is variable and non-timing. In the protocol for ECPRI asynchronous transmission, the transmission of data is transmitted in groups of bits, which may be 1 character of 8 bits or longer. The sender can send these groups of bits at any time, while the receiver never knows when they will arrive; during an asynchronous transmission the receiver may perform other operations during the transmission.
Step S2: according to the judgment of the signal priority, the hysteresis degree of the 4G signal and the 5G signal is balanced, the CPRI protocol data of the 4G signal and the ECPRI protocol data of the 5G signal are fused, and transmission resources are applied to the maximum extent on the basis of balancing the transmission efficiency of the two protocol data;
the purpose of this step is to insert the ECPRI protocol data of the non-timed asynchronous transmission into the CPRI protocol data of the timed synchronous transmission, and the ECPRI and the CPRI share the forwarding resource of 10G. In order to fully utilize the forward transmission resources, the invention fuses the ECPRI of 5G and the CPRI protocol data of 4G, and the transmission resources are applied to the maximum extent on the basis of balancing the transmission efficiency of the two protocol data.
It should be noted that, in the process of transmitting CPRI protocol data of 4G alone (synchronous transmission): let data frame be A, adjacent data frame Ai，Ai+1The time interval between them is the same, denoted as T0(ii) a Data frame AiWherein the transmitted data is Ti-1+T0Erasing the acquired CPRI protocol data within a time period, wherein Ti-1Indicating the transmission of data frame Ai-1The time required.
In the course of the separate transmission of the 5G ECPRI protocol data (asynchronous transmission): when data S needing to be transmitted is acquired, the data can be transmitted to a receiving end after a start bit and a stop bit are respectively inserted into the front end and the rear end of the data.
The transmission efficiency of two protocol data can be influenced when inserting the ECPRI protocol data of the non-timed asynchronous transmission into the CPRI protocol data of the timed synchronous transmission to complete the data compression and combination, so the invention focuses on how to utilize the forward transmission resource to the maximum extent while balancing the transmission efficiency of the two signals. The detailed process of compressing and merging two protocol data is as follows:
a) it should be noted that, the CPRI protocol data of 4G is collected at any time and transmitted at regular time, while the ECPRI protocol data of 5G is generated at irregular time and transmitted at any time. As shown, CPRI protocol data frame A of 4GiTransmitted is a time period Ti-1+T0(i-1) when the clock is at Ti-1+T0(i-1) at time, data frame A is obtained according to the collected informationi(ii) a Wherein T isi-1CPRI protocol data frame A for representing transmission 4Gi-1The time required; t is0(i-1) is data frame Ai-1And AiThe time interval therebetween;
b) to maximize the utilization of forward resources, at Ti-1+T0(i-1) the 5G EPRI protocol data collected in the time period will be in the time period T in priority0(i-1) transmission, due to the sporadic generation of the ECPRI protocol data of 5G, cannot be ensured in the time period T0(i-1) can be completely transmitted, and the ECPRI protocol data of the 5G signal which is not completely transmitted is recorded as ECPRI protocol data
c) So far, the CPRI protocol data frame A of 4G is obtainediAnd a time period T0(i-1) ECPRI protocol data of 5G signal not completely transmitted
d) CPRI protocol data frame A for 4GiElapsed time TiAfter the transmission is finished, and obtaining a time period TiECPRI protocol data S of internally generated 5G signalsiNote that, the data SiIs a time period TiProduced at random, SiFrom a plurality of sub-data segments s*Composition of the kth sub-data segment
The sound generation time is
e) When 4G data frame AiAfter the transmission is finished, the 4G signal entering time is T0At this point, the transmission of 5G ECPRI protocol data is started. It should be noted that the 5G ECPRI protocol data includes: time period T0(i-1) ECPRI protocol data of 5G signal not completely transmitted
Time period TiInternally generated SiIn a time period T0Also generates 5G data
Three parts;
f) first, ECPRI protocol data of 5G signal is assumed
SiAnd
and after all the data are transmitted, 4G data are transmitted: then the time T' when the ECPRI protocol data of the 5G signal is completely transmitted is obtained according to the transmitted data amount, and the time and the 4G interval time T are calculated0Difference of (2)
The ReLU is a common activation function, and is not described herein again. The difference can be reflectedIn data frame AiThe degree of delay of transmission of 5G data to transmission of 4G signals; the larger the value is, the larger the hysteresis degree of signal transmission is, and the transmission of the 4G signal becomes slower;
g) in parallel, obtaining a degree of hysteresis in the transmission of 5G data
Wherein the content of the first and second substances,
representing data
Middle k sub-data segments
At the moment of generation of (t)kRepresenting data
Middle k sub-data segments
The time of the real-time transmission is,
is shown in data frame AiThe larger the value of the hysteresis degree of the 5G signal transmission, the larger the hysteresis degree of the 5G signal is represented;
h) in order to ensure the balance of the lags of the 4G signal and the 5G signal in the process of data compression combination, the signal priority is firstly judged:
wherein the content of the first and second substances,
represents the sum of the hysteresis degrees of 4G data generated in the history transmission process,
is shown in data frame AiThe predicted 4G data lag degree under the ECPRI protocol data of the priority transmission 5G signal;
respectively representing the sum of the hysteresis degrees of the 5G data generated in the history transmission process and the data frame AiThe predicted 5G data lag degree under the ECPRI protocol data of the priority transmission 5G signal; gamma is an adjusting coefficient and is used for adjusting the proportional relation of the hysteresis degrees of two protocol data, according to prior, 5G has higher requirement on the transmission speed, so the hysteresis degree of 5G data transmission is required to be lower than that of 4G data, and the invention takes gamma as 1.5;
i) when alpha is less than or equal to 1, the 5G signal is delayed seriously, and then the data frame AiThe 5G signal should be transmitted preferentially: at the moment, 5G ECPRI protocol data is transmitted
Merge into data frame AiThen, the data frame A is transmitted synchronouslyi，Ai+1Interval of time T between0(i) Is T'; therefore, the compression algorithm is utilized to calculate the time delay T' -T required by the insertion of PTP packet data (1588 PTP packet with Ethernet packet for synchronization)0And writing the time delay into the data, and the receiver receives the synchronous data and simultaneously according to the original synchronous time T + (T' -T)0) Processing is carried out to ensure clock synchronization among base station equipment;
j) when alpha > 1 indicates that the 4G signal lags more seriously, then in data frame AiThe 4G signal should be transmitted preferentially: at the moment, 5G ECPRI protocol data is transmitted
Is segmented into segments at time T0Data that can be transmitted and cannot be transmitted at time T05G ECPRI protocol data with internal completion transmission
The first transmission of the ECPRI protocol data of the 5G part simultaneously guarantees that the 4G signal has no hysteresis and cannot be transmitted at the time T05G ECPRI protocol data with internal completion transmission
In data frame Ai+1Time T of0(i +1) priority transmission;
k) so far, the compression and combination of the CPRI protocol data of the 4G signal and the protocol data of the 5G signal are completed, and the forwarding resources are utilized to the maximum extent on the basis of balancing the transmission efficiency of the two protocol data.
Thus, the present invention has been completed.
Claims (4)
1. A CPRI and ECPRI protocol data fusion transmission method is characterized by comprising the following steps:
step S1: the method comprises the steps of obtaining CPRI protocol data of 4G signals and ECPRI protocol data of 5G signals in real time, wherein in a CPRI synchronous transmission protocol, data transmission is transmitted by taking a data block as a unit, and in an ECPRI asynchronous transmission protocol, data transmission is transmitted by dividing bits into small groups;
step S2: according to the judgment of the signal priority, the hysteresis degree of the 4G signal and the 5G signal is balanced, the CPRI protocol data of the 4G signal and the ECPRI protocol data of the 5G signal are fused, and the transmission resources are applied to the maximum extent on the basis of balancing the transmission efficiency of the two protocol data.
2. The method according to claim 1, wherein said step S1 is configured to obtain CPRI protocol data and ECPRI protocol data transmitted between 5G +4G dual-mode base station devices, the 4G network base station device uses a CPRI interface protocol, a frame structure of CPRI protocol forwarding data is fixed, the 5G network base station device uses an ECPRI interface protocol, and the frame structure of ECPRI protocol forwarding data is variable and non-timed.
3. The CPRI and ECPRI protocol data fusion transmission method according to claim 2, wherein the step S2 is configured to insert the ECPRI protocol data transmitted asynchronously and aperiodically into the CPRI protocol data transmitted synchronously and aperiodically, the ECPRI and the CPRI share a forwarding resource of 10G, and in the process of transmitting the CPRI protocol data of 4G separately, the data frame is marked as a, and the adjacent data frame a is adjacent to the data frame aiAnd Ai+1The time interval between them is the same, denoted as T0Data frame AiWherein the transmitted data is Ti-1+T0Erasing the acquired CPRI protocol data within a time period, wherein Ti-1Indicating the transmission of data frame Ai-1The time required is the time period T in the process of separately transmitting the ECPRI protocol data of 5G0(i-1) recording ECPRI protocol data of 5G signal not completely transmitted
Time period TiInternally generated SiAnd in the time period T0Similarly, 5G data is generated and recorded as
When the data S needing to be transmitted is acquired, the data can be transmitted to the receiving end after the start bit and the stop bit are respectively inserted into the front end and the rear end of the data.
4. The method for converged transmission of CPRI and ECPRI protocol data according to claim 3, wherein the step of compressing and combining the CPRI protocol data and the ECPRI protocol data comprises the following steps:
a) CPRI protocol data frame A of 4GiTransmitted is a time period Ti-1+T0(i-1) when the clock is at Ti-1+T0(i-1) at the time of the timing,obtaining data frame A according to the collected informationiWherein T isi-1CPRI protocol data frame A for representing transmission 4Gi-1Required time, T0(i-1) is data frame Ai-1And AiThe time interval therebetween;
b) at Ti-1+T0(i-1) the 5G EPRI protocol data collected in time is preferentially in time period T0(i-1) inner transmission, recording ECPRI protocol data of 5G signal which is not completely transmitted as ECPRI protocol data
c) Obtaining CPRI protocol data frame A of 4GiAnd a time period T0(i-1) ECPRI protocol data of 5G signal not completely transmitted
d) CPRI protocol data frame A for 4GiElapsed time TiAfter the transmission is finished, and obtaining a time period TiECPRI protocol data S of internally generated 5G signalsi；
e) In 4G data frame AiAfter the transmission is finished, the 4G signal entering time is T0When the transmission of the 5G ECPRI protocol data is started;
f) ECPRI protocol data for 5G signals
SiAnd
after all the data are transmitted, 4G data are transmitted, the time T' when the ECPRI protocol data of the 5G signal are completely transmitted is obtained according to the transmitted data quantity, and the time and the 4G interval time T are calculated0Difference of (2)
The calculation method comprises the following steps:
g) obtaining a degree of hysteresis for transmission of 5G data
The calculation method comprises the following steps:
wherein the content of the first and second substances,
representing data
Middle k sub-data segments
At the moment of generation of (t)kRepresenting data
Middle k sub-data segments
The time of the real-time transmission is,
is shown in data frame AiThe larger the value of the hysteresis degree of the 5G signal transmission, the larger the hysteresis degree of the 5G signal is represented;
h) in order to ensure the balance of the lags of the 4G signal and the 5G signal in the process of data compression combination, the signal priority is firstly judged by the following method:
wherein the content of the first and second substances,
represents the sum of the hysteresis degrees of 4G data generated in the history transmission process,
is shown in data frame AiThe degree of the 4G data lag predicted under the ECPRI protocol data of the priority transmission 5G signal,
and
respectively representing the sum of the hysteresis degrees of the 5G data generated in the history transmission process and the data frame AiThe delay degree of the 5G data is predicted under the ECPRI protocol data of which the 5G signal is transmitted preferentially, and gamma is an adjusting coefficient and is used for adjusting the proportional relation of the delay degrees of the two protocol data;
i) when alpha is less than or equal to 1, the 5G signal is delayed seriously, and then the data frame AiShould transmit the 5G signal with priority, and then transmit the 5G ECPRI protocol data
MergingTo data frame AiThen, the data frame A is transmitted synchronouslyi,Ai+1Interval of time T between0(i) For T ', a compression algorithm is used to calculate the time delay T' -T required for PTP packet data insertion0And writing the time delay into the data, and the receiver receives the synchronous data and simultaneously according to the original synchronous time T + (T' -T)0) Processing is carried out to ensure clock synchronization among base station equipment;
j) when alpha is>1 indicates that the 4G signal lags more seriously, then in data frame AiShould transmit the 4G signal with priority, and then transmit the 5G ECPRI protocol data
Is segmented into segments at time T0Data that can be transmitted and cannot be transmitted at time T05G ECPRI protocol data with internal completion transmission
The first transmission of the ECPRI protocol data of the 5G part simultaneously guarantees that the 4G signal has no hysteresis and cannot be transmitted at the time T05G ECPRI protocol data with internal completion transmission
In data frame Ai+1Time T of0(i +1) priority transmission;
k) so far, the compression and combination of the CPRI protocol data of the 4G signal and the protocol data of the 5G signal are completed, and the forwarding resources are utilized to the maximum extent on the basis of balancing the transmission efficiency of the two protocol data.
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Country or region after: China Address after: 518103 Room 101, building C4, Zone C, Fuhai international science and Technology Park, Zhancheng community, Fuhai street, Bao'an District, Shenzhen, Guangdong Province Applicant after: Shenzhen Jiaxian Communication Technology Co.,Ltd. Address before: 518000 Room 101, building C4, Zone C, Fuhai international science and Technology Park, Zhancheng community, Fuhai street, Bao'an District, Shenzhen, Guangdong Province Applicant before: Shenzhen Jiaxian communication equipment Co.,Ltd. Country or region before: China |
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