CN103905322B - A kind of method and apparatus for realizing data transfer via PTN - Google Patents
A kind of method and apparatus for realizing data transfer via PTN Download PDFInfo
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Abstract
It is an object of the invention to provide a kind of method and apparatus for realizing data transfer via PTN.Specifically, the Model of network traffic according to corresponding to PTN, configuration packet buffer unit；Determine the reading interval information of the buffering packets in buffering of packets device, wherein, buffering packets will be transmitted between BBU and RRU；According to interval information is read, corresponding buffering packets are read from buffering of packets device, for being transmitted between BBU and RRU.Compared with prior art, the present invention passes through configuration packet buffer unit, and the reading interval information of the buffering packets in determination buffering of packets device, with according to reading interval information, corresponding buffering packets are read from buffering of packets device, for being transmitted between BBU and RRU, realize the read access time interval of buffering packets in self-adaptative adjustment buffering of packets device, while the delay and jitter that PTN network causes is eliminated, avoid the spilling and underflow of buffering of packets device, it is ensured that the stability of network system.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a technique for implementing data transmission via a PTN.
Background
In a new RAN (Radio Access Network) architecture, it is a new technical trend to apply a public Network, such as a PTN (Packet Transport Network), instead of a private optical Network. However, using a public network will cause network transmission delay (delay) and jitter (jitter). For example, on an Ir interface, the Ir service is a Time-critical service, and if a network diagram based on iroptn (Ir over ptn) shown in fig. 1 is adopted to connect a BBU (Building Base Band Unit) and an RRU (Remote Radio Unit) instead of the Ir interface, where PTP (Precision Time Protoco1) is an accurate clock protocol and sync e is a synchronous ethernet, performance degradation will be caused if a de-jitter solution is not adopted in the RAN network. The conventional debouncing method has the following disadvantages: consume a large amount of buffer memory, longer transfer delay, have no protection against buffer overflow (overflow) and underflow (underflow), etc.
Disclosure of Invention
The invention aims to provide a method and equipment for realizing data transmission through a PTN.
According to an aspect of the present invention, a method for enabling data transmission via a PTN is provided, wherein the method comprises the steps of:
x configuring a grouping buffer device according to a network flow model corresponding to the PTN;
wherein, the method also comprises:
b, determining reading interval information of a buffer packet in the packet buffer device, wherein the buffer packet is transmitted between the BBU and the RRU;
c, reading the corresponding buffer packet from the packet buffer device according to the reading interval information so as to transmit the buffer packet between the BBU and the RRU.
According to another aspect of the present invention, there is also provided a data transmission apparatus for enabling data transmission via a PTN, wherein the data transmission apparatus includes:
the configuration device is used for configuring the grouping buffer device according to the network flow model corresponding to the PTN;
wherein, this data transmission equipment still includes:
an interval determining device, configured to determine read interval information of a buffered packet in the packet buffering device, where the buffered packet is to be transmitted between the BBU and the RRU;
and the reading device is used for reading the corresponding buffer packet from the packet buffer device according to the reading interval information so as to transmit the buffer packet between the BBU and the RRU.
According to still another aspect of the present invention, there is also provided a base station, wherein the base station comprises the data transmission apparatus for implementing data transmission via the PTN according to the aforementioned another aspect of the present invention.
According to yet another aspect of the present invention, there is also provided a BBU device, wherein the BBU device comprises a data transmission device for implementing data transmission via a PTN according to the aforementioned another aspect of the present invention.
According to still another aspect of the present invention, there is also provided an RRU device, wherein the RRU device includes a data transmission device for implementing data transmission via a PTN according to another aspect of the present invention.
Compared with the prior art, the method and the device have the advantages that the packet buffer device is configured, the reading interval information of the buffer packets in the packet buffer device is determined, the buffer packets are transmitted between the BBU and the RRU, the corresponding buffer packets are read from the packet buffer device according to the reading interval information and are transmitted between the BBU and the RRU, the reading time interval of the buffer packets in the packet buffer device is adjusted in a self-adaptive mode, delay and jitter caused by the PTN are eliminated, meanwhile, overflow and underflow of the packet buffer device are avoided, the method and the device can be realized through software without adding extra hardware, delay and jitter caused by the PTN are eliminated in a simple and effective mode, and the stability of a network system and high service quality of the system are guaranteed.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 shows a schematic diagram of a network in the prior art, which is based on iroptn (Ir over ptn) instead of Ir interface to connect BBU and RRU;
FIG. 2 illustrates a schematic diagram of an apparatus for enabling data transmission via a PTN in accordance with an aspect of the present invention;
fig. 3 shows a schematic diagram of an apparatus for enabling data transmission via a PTN according to a preferred embodiment of the present invention;
FIG. 4 illustrates a flow diagram of a method for enabling data transmission via a PTN in accordance with another aspect of the subject invention;
fig. 5 shows a flowchart of a method for implementing data transmission via a PTN according to a preferred embodiment of the present invention.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Fig. 2 shows a data transmission device 1 for data transmission via a PTN according to an aspect of the present invention, wherein the data transmission device 1 comprises configuration means 11, interval determination means 12 and reading means 13. Specifically, the configuration device 11 configures a packet buffer device according to a network traffic model corresponding to the PTN; the interval determining device 12 determines the read interval information of the buffered packets in the packet buffering device, wherein the buffered packets are to be transmitted between the BBU and the RRU; the reading device 13 reads the corresponding buffer packet from the packet buffer device according to the reading interval information, so as to transmit the buffer packet between the BBU and the RRU. Here, the data transmission device 1 includes, but is not limited to, any electronic product that implements data transmission through PTN in a communication system, such as BBU and RRU that implement data transmission through IroPTN, such as a base station, and the like. Here, the PTN includes, but is not limited to, a PTN subsystem, etc. with RAN as a PTN network element. Here, the base station refers to a device, such as an eNB base station, which connects a fixed part and a radio part in a mobile communication system and connects to a mobile station by radio transmission over the air. Here, the RAN refers to a part of a network in which fixed subscribers are all or partially wirelessly connected to a switch. Here, the PTN is an optical transport network architecture designed for burstiness of packet service traffic and requirements of statistical multiplexing transmission between an IP service and an underlying optical transport medium, and supporting multi-service provision with the packet service as a core. It will be understood by those skilled in the art that the above-described data transmission device 1, base station, RAN and PTN are only examples, and other existing or future data transmission devices 1 or base stations or RAN or PTN may be applied to the present invention, and are included in the scope of the present invention and are incorporated herein by reference.
Specifically, the configuration device 11 configures the packet buffer device according to the network traffic model corresponding to the PTN. Herein, the network traffic model includes, but is not limited to, a normal distribution model (normal distribution model), an LRD (long coherent distribution model), and the like. For example, assume that the network traffic model corresponding to the packet transport network PTN1 is based on a normal distribution model, which conforms to a gaussian function as shown in the following formula (1):
where μ is the mean and σ2For variance, the configuring device 11 may first determine the variance σ corresponding to the packet transport network PTN1 normal distribution model according to the system delay/jitter requirement, such as delay/jitter index information of PTN access node delay/jitter < 150us/15us, PTN aggregation node delay/jitter < 100us/10us, end-to-end delay/jitter < 4ms/1ms, etc. for Ir service system2E.g. variance σ2Positively correlated with the magnitude of delay/jitter; then, based on the variance σ2Size of (b) and system information such as system BLER (Block Error Rate) such as BLER < 10 for Ir service systems-7Determining packet buffering means, said packet buffering means as determined comprising 10 data packets, each data packet having header information of 16 bits, payload information of 262 bits, wherein the size of a data packet corresponds to its data packet format.
Preferably, the configuration device 11 may further determine, according to a network traffic model corresponding to the PTN, buffering configuration information of the packet buffering device; then, the packet buffer is configured according to the cache configuration information. Here, the buffering configuration information includes, but is not limited to, information about the number of buffering devices, the size of the buffering devices, such as the number of data packets that can be accommodated and the size of the data packets, threshold information that determines how fast the data packets are read from the buffering devices, and the like. For example, assume that the network traffic model corresponding to the packet transport network PTN1 is a normal distribution model, which conforms to the gaussian function shown in the above formula (1), and the BLER of the current Ir service system is less than 10-7The configuration device 11 may first determine the variance σ corresponding to the normal distribution model of the PTN1 according to the delay/jitter requirement of the system2(ii) a Then, based on the variance σ2Size and system information such as system BLER e.g. BLER < 10 for Ir service systems-7The determined buffering configuration information of the packet buffer electronic de-jitter buffer1 comprises 10 data packets, each data packet has header information of 16bit and payload information of 262bit, wherein the size of the data packet corresponds to the format of the data packet; then, the configuration device 11 configures the packet buffer device elastic de-jitter ring 1 according to the buffer configuration information.
It will be understood by those skilled in the art that the above-described manner of configuring the packet buffering means is merely exemplary, and other manners of configuring the packet buffering means, now known or hereafter developed, such as may be suitable for use with the present invention, are also included within the scope of the present invention and are hereby incorporated by reference.
The interval determining means 12 determines read interval information of a buffered packet in the packet buffering means, wherein the buffered packet is to be transmitted between the BBU and the RRU. Specifically, the interval determination means 12 first statistically determines a desired time interval between adjacent buffered packets in the packet buffering means by, for example, a reception time interval between adjacent buffered packets in a plurality of consecutive buffered packets transmitted via the PTN; then, according to the expected time interval and the receiving time average value corresponding to the adjacent buffering packets in the same buffering packet window transmitted by the PTN, the initial reading interval information of the buffering packets in the packet buffering device is adjusted to obtain the reading interval information.
For example, assuming that the packet buffer determined by the configuration determining device 11 is an elastic de-jitter ring buffer1 which can accommodate 10 packets (packets) with size of 278 bits, and assuming that the time elapsed from the reception of the first packet1 to the continuous reception of the 101 th packet101 by the elastic de-jitter ring buffer1 is 0.1ms, that is, the total of the reception time intervals between adjacent buffered packets in the 101 consecutive buffered packets is 0.1ms, the interval determining device 12 can calculate the expected time interval t between adjacent buffered packets in the multiple consecutive packets by the following formula (2)s：
Wherein,representing the sum of the receiving time intervals from the t (i) th packet to the t (i + n +1) th packet, i.e., the adjacent buffered packets in n +1 consecutive packets, if the interval determining device 12 calculates the elas from 0.1ms from the time when the first packet1 is received to the time when the 101 th packet101 is continuously received according to the elastic de-jitter ring buffer1 by the above formula (2)t is the desired time interval between adjacent buffer packets in tic de-jitter ring 1s0.1ms/100 ═ 1 us; then, the interval determination device 12 adjusts the initial reading interval information of the buffered packets in the packet buffer device according to the expected time interval and the receiving time average value corresponding to the adjacent buffered packets in the same buffered packet window transmitted by the PTN, to obtain the read interval information, for example, in the above example, assuming that the initial read interval information of the buffered packet in the elastic de-jitter ring buffer1 is T, while elastic de-jitter ring buffer1 after every 500 packets are received, i.e., the buffered packet window N is 500, it is necessary to determine the adjustment information for the initial read interval information T, such as whether the buffered packet needs to be read fast, or there is a need to slow down reading of buffered packets or to maintain the existing buffered packet read rate, the interval determining means 12 may determine the receive time average by the following equation (3):
wherein N is the buffered packet window, which may be predetermined or determined by a dynamic moving average algorithm, for example, determined by a moving window of a moving average, and assuming that the packet buffer apparatus elastic de-jitter in the buffer1 has a time of 0.25ms from the time of receiving the kth packet to the time of pushing forward to the kth-499 packet, that is, the time required for receiving the 500 packets, the interval determination apparatus 12 may determine the average value of the receiving time as t (k) by the above equation (3)average0.25ms/500 us/0.5 us; next, the interval determination means 12 adjusts initial read interval information of the buffered packets in the packet buffering means according to the expected time interval in combination with the reception time average value by the following formula (4) to obtain the read interval information:
Δt(k)＝t(k)average-ts(4)
for example, in the following example, the interval determining means 12 obtains Δ T (k) — 0.5us-1us ═ 0.5us according to the above equation (4), which indicates that the reading rate of the buffered packets in the packet buffering means elastic de-jitter ring buffer1 is increased, and assuming that the initial reading interval information T of the buffered packets in the packet buffering means elastic de-jitter ring buffer1 is 2us, the reading interval information of the buffered packets in the packet buffering means elastic de-jitter ring buffer1 determined by the interval determining means 12 is T- | Δ T | (k) | — (1.5 us; for another example, if the interval determination device 12 obtains Δ T (k) 0.5us according to the above equation (4), which indicates that the reading rate of the buffered packets in the packet buffer elastic de-jitter ring 1 becomes slow, the interval determination device 12 determines that the reading interval information of the buffered packets in the packet buffer elastic de-jitter ring 1 is T + | Δ T (k) | 2.5 us.
It will be understood by those skilled in the art that the above-mentioned manner of determining the read interval information of the buffered packets in the packet buffering means is only an example, and other existing or later-occurring manners of determining the read interval information of the buffered packets in the packet buffering means, such as may be applicable to the present invention, are also included in the scope of the present invention and are herein incorporated by reference.
It will be understood by those skilled in the art that the disclosed method for eliminating delay and jitter caused by PTN network can also be applied to the situation of eliminating delay and jitter with larger delay and jitter, such as IP network, and therefore, should be included in the scope of the present invention and is incorporated herein by reference.
It should be understood by those skilled in the art that the above-mentioned manner for determining the read interval information according to the performance index information of data transmission between the BBU and the RRU is only an example, and other existing or future manners for determining the read interval information according to the performance index information of data transmission between the BBU and the RRU, such as being applicable to the present invention, should also be included in the scope of the present invention, and is included herein by reference.
The reading device 13 reads the corresponding buffer packet from the packet buffer device according to the reading interval information, so as to transmit the buffer packet between the BBU and the RRU. For example, the reading device 13 reads the corresponding buffer packet from the packet buffer device elastic de-jitter buffer1 according to the reading interval information, such as T- | Δ T (k) | 1.5us, determined by the interval determining device 12, for transmission between the BBU and the RRU.
The various devices of the data transmission device 1 are constantly in operation. Specifically, the configuration device 11 configures the packet buffer device continuously according to the network traffic model corresponding to the PTN; the interval determining means 12 continuously determines the read interval information of the buffered packets in the packet buffering means, wherein the buffered packets are to be transmitted between the BBU and the RRU; the reading device 13 continuously reads the corresponding buffer packet from the packet buffer device according to the reading interval information, so as to transmit the buffer packet between the BBU and the RRU. It will be understood by those skilled in the art that "continuously" means that the respective devices of the data transmission apparatus 1 continuously perform the configuration of the packet buffer device, the determination of the reading interval information, and the reading of the buffered packet, respectively, until the data transmission apparatus 1 stops the configuration of the packet buffer device for a longer time.
Fig. 3 shows a schematic diagram of an apparatus for implementing data transmission via a PTN according to a preferred embodiment of the present invention, wherein the data transmission apparatus 1 comprises a configuration device 11 ', an interval determination device 12', and a reading device 13 ', wherein the interval determination device 12' comprises a desired determination unit 121 'and an interval determination unit 122'. Specifically, the configuration device 11' configures a packet buffer device in the PTN according to a network traffic model corresponding to the PTN; the expectation determining unit 121' determines an expectation time interval between buffered packets in the packet buffering means; the interval determining unit 122' determines the reading interval information corresponding to the buffered packets in the packet buffering device according to the expected time interval; the reading device 13' reads the corresponding buffer packet from the packet buffer device according to the reading interval information, so as to transmit the buffer packet between the BBU and the RRU. Here, the configuration device 11 'and the reading device 13' are the same as or similar to the corresponding devices in the embodiment of fig. 2, and for the sake of brevity, are not described again and are included herein by reference.
Specifically, the expectation determining unit 121' determines an expectation time interval between adjacent buffered packets in the packet buffering means. For example, assuming that the packet buffer determined by the configuration determining device 11 'is an elastic de-jitter ring buffer1 which can accommodate 10 packets (packets) with size of 278 bits, and assuming that the time elapsed from the reception of the first packet1 to the continuous reception of the 101 th packet101 by the elastic de-jitter ring buffer1 is 0.1ms, that is, the total receiving time interval between adjacent buffered packets in the 101 consecutive buffered packets is 0.1ms, the expectation determining unit 121' may obtain the expected time interval t between adjacent buffered packets in the multiple consecutive packets by the first calculation of the above formula (2)s' -0.1 ms/100 ═ 1 us; the elastic-jitter ring buffer1 continues to receive packets, and assuming that the time elapsed from the reception of the first packet1 to the continuous reception of the 201 th packet201 is 0.15ms, that is, the total of the reception time intervals between adjacent buffered packets in the 201 consecutive buffered packets is 0.15ms, the expectation determining unit 121' may calculate again the expectation time interval t between adjacent buffered packets in the consecutive packets according to the above formula (2)sWhen "— 0.15ms/200 ═ 0.75us, the expectation determination unit 121' may determine t, which is an average value of the expected time intervals calculated twices＝(ts′+ts"/2 ═ 0.875us is the desired time interval.
Preferably, the expectation determining unit 121' may further statistically determine the expectation time interval according to a reception time interval between adjacent buffered packets of a plurality of consecutive buffered packets transmitted via the PTN. For example, assuming that the packet buffer determined by the configuration determining device 11 'is an elastic de-jitter ring buffer1 which can accommodate 10 packets (packets) with size of 278 bits, and assuming that the time elapsed from the reception of the first packet1 to the continuous reception of the 101 th packet101 by the elastic de-jitter ring buffer1 is 10ms, that is, the sum of the reception time intervals between adjacent buffered packets in the 101 continuous buffered packets is 0.1ms, the determining unit 121' is expected to pass the above-mentioned public bufferEquation (2) calculates a desired time interval t between adjacent buffered packets in the plurality of consecutive packetssIf the time from the reception of the first packet1 to the continuous reception of the 101 th packet101 according to the elastic de-jitter ring buffer1 is 0.1ms, the expected time interval between adjacent buffer packets in the elastic de-jitter ring buffer1, i.e., ts＝0.1ms/100＝1us。
It will be appreciated by those skilled in the art that the above-described manner of determining the desired time interval is merely exemplary, and that other existing or future manners of determining the desired time interval, such as may be applicable to the present invention, are intended to be within the scope of the present invention and are hereby incorporated by reference.
Next, the interval determination unit 122' determines, according to the expected time interval, read interval information corresponding to the buffered packets in the packet buffer. For example, assume that the desired time interval determined by the desired determination unit 121' is tsThe interval determining unit 122 'adjusts the initial read interval information of the buffered packets in the packet buffering device according to the expected time interval and the receiving time average value corresponding to the adjacent buffered packets within the same buffered packet window transmitted by the PTN, so as to obtain the read interval information, for example, assuming that the initial read interval information of the buffered packets in the elastic de-jitter ring buffer1 is T, and the elastic de-jitter ring buffer1 needs to determine the adjustment information of the initial read interval information T after every 500 packets are received, i.e., the buffered packet window N is 500, such as whether the buffered packets need to be read fast or slow down, or the existing buffered packet reading rate is maintained, the interval determining unit 122' may first determine the receiving time average value through the above formula (3), assuming that the time required for the packet buffer elastic de-jitter ring 1 to push forward to the k-499 th packet from the reception of the k-th packet is 0.25ms, the interval determination unit 122' can determine the reception time average value as t (k) by the above equation (3)average＝0.25ms/500＝0.5us；Then, the interval determining unit 122 ' adjusts the initial read interval information of the buffered packets in the packet buffering means according to the expected time interval and the receiving time average value by the above formula (4) to obtain the read interval information, for example, the interval determining unit 122 ' obtains Δ T (k) — 0.5us-0.875us — -0.375us according to the above formula (4), which indicates that the read rate of the buffered packets in the packet buffering means elastic de-jitter buffer1 is faster, and assuming that the initial read interval information T of the buffered packets in the packet buffering means elastic de-jitter buffer1 is 2us, the read interval information of the buffered packets in the packet buffering means elastic de-jitter buffer1 determined by the interval determining unit 122 ' is T- | Δ T (k) | 1.625 us; for another example, if the interval determining unit 122 'obtains Δ T (k) ═ 0.375us according to the above equation (3), which indicates that the reading rate of the buffered packets in the packet buffer apparatus elastic de-jitter ring 1 becomes slow, the reading interval information of the buffered packets in the packet buffer apparatus elastic de-jitter ring buffer1 determined by the interval determining unit 122' is T + | Δ T (k) | 2.375 us.
Preferably, the interval determining unit 122' may further determine, according to the buffered packet window, a receiving time average value corresponding to an adjacent buffered packet transmitted via the PTN within the same buffered packet window; then, according to the expected time interval and in combination with the average value of the receiving time, the reading interval information corresponding to the buffered packets in the packet buffer device is determined.
For example, assuming that the initial reading interval information of the buffered packet in the elastic de-jitter ring buffer1 is T, and after every 500 packets are received, i.e. the buffered packet window N is 500, the adjustment information of the initial reading interval information T needs to be determined, such as whether the buffered packet needs to be read faster, or the buffered packet needs to be read slower, or the existing buffered packet reading rate needs to be maintained, the interval determining unit 122' can determine the receiving time average value by the above formula (3), and assuming that the packet buffering device elastic de-jitter ring buffer1 pushes forward from the k-th packet receivedThe time required for the k-499 th packet is 0.25ms, the interval determining unit 122' can determine the reception time average value as t (k) through the above equation (3)average＝0.25ms/500＝0.5us。
Next, the interval determining unit 122 ' adjusts the initial read interval information of the buffered packets in the packet buffering device according to the expected time interval and the receiving time average value by the above formula (4) to obtain the read interval information, if the interval determining unit 122 ' obtains Δ T (k) -0.5 us-1 us-0.5 us according to the above formula (4), which indicates that the read rate of the buffered packets in the packet buffering device elastic de-jitter buffer1 is faster, and if the initial read interval information T of the buffered packets in the packet buffering device elastic de-jitter buffer1 is 2us, the read interval information of the buffered packets in the packet buffering device elastic de-jitter buffer1 determined by the interval determining unit 122 ' is T- | Δ T (k) | 1.5 us; for another example, if the interval determining unit 122 'obtains Δ T (k) ═ 0.5us according to the above equation (4), which indicates that the reading rate of the buffered packets in the packet buffer apparatus elastic de-jitter ring 1 becomes slow, the reading interval information of the buffered packets in the packet buffer apparatus elastic de-jitter ring 1 determined by the interval determining unit 122' is T + | Δ T (k) | 2.5 us.
Fig. 4 illustrates a flow diagram of a method for enabling data transmission via a PTN in accordance with another aspect of the subject innovation.
Specifically, in step S1, the data transmission device 1 configures a packet buffer according to the network traffic model corresponding to the PTN; in step S2, the data transmission apparatus 1 determines read interval information of a buffered packet in the packet buffer, where the buffered packet is to be transmitted between the BBU and the RRU; in step S3, the data transmission device 1 reads the corresponding buffer packet from the packet buffer apparatus according to the read interval information, so as to transmit the corresponding buffer packet between the BBU and the RRU. Here, the data transmission device 1 includes, but is not limited to, any electronic product that implements data transmission through PTN in a communication system, such as BBU and RRU that implement data transmission through IroPTN, such as a base station, and the like. Here, the PTN includes, but is not limited to, a PTN subsystem, etc. with RAN as a PTN network element. Here, the base station refers to a device, such as an eNB base station, which connects a fixed part and a radio part in a mobile communication system and connects to a mobile station by radio transmission over the air. Here, the RAN refers to a part of a network in which fixed subscribers are all or partially wirelessly connected to a switch. Here, the PTN is an optical transport network architecture designed for burstiness of packet service traffic and requirements of statistical multiplexing transmission between an IP service and an underlying optical transport medium, and supporting multi-service provision with the packet service as a core. It will be understood by those skilled in the art that the above-described data transmission device 1, base station, RAN and PTN are only examples, and other existing or future data transmission devices 1 or base stations or RAN or PTN may be applied to the present invention, and are included in the scope of the present invention and are incorporated herein by reference.
Specifically, in step S1, the data transmission device 1 configures a packet buffer in the PTN according to the network traffic model corresponding to the PTN. Here, the network traffic model includes, but is not limited to, a normal distribution model (normal distribution model), an LRD (long range dependent distribution model), and the like. For example, assume that the network traffic model corresponding to the packet transport network PTN1 is a normal distribution model, which conforms to a gaussian function as shown in the following equation (5):
where μ is the mean and σ2For variance, in step S1, the data transmission device 1 may first determine the variance σ corresponding to the packet transport network PTN1 normal distribution model according to the system delay/jitter requirement, such as delay/jitter of PTN access node < 150us/15us, delay/jitter of PTN aggregation node < 100us/10us, end-to-end delay/jitter < 4ms/1ms, etc. for Ir service system2E.g. variance σ2And delayThe magnitude of the delay/jitter is positively correlated; then, based on the variance σ2Size of (b) and system information such as system BLER (Block error Rate) such as BLER < 10 for Ir service systems-7Determining packet buffering means, said packet buffering means as determined comprising 10 data packets, each data packet having header information of 16 bits, payload information of 262 bits, wherein the size of a data packet corresponds to its data packet format.
Preferably, in step S1, the data transmission device 1 may further determine the buffering configuration information of the packet buffering apparatus according to the network traffic model corresponding to the PTN; then, the packet buffer is configured according to the cache configuration information. Here, the buffering configuration information includes, but is not limited to, information about the number of buffering devices, the size of the buffering devices, such as the number of data packets that can be accommodated and the size of the data packets, threshold information that determines how fast the data packets are read from the buffering devices, and the like. For example, assume that the network traffic model corresponding to the packet transport network PTN1 is a normal distribution model, which conforms to the gaussian function shown in the above formula (5), and the BLER of the current Ir service system is less than 10-7Then, in step S1, the data transmission device 1 may first determine the variance σ corresponding to the normal distribution model of the packet transport network PTN1 according to the system delay/jitter requirement2(ii) a Then, based on the variance σ2Size and system information such as system BLER e.g. BLER < 10 for Ir service systems-7The determined buffering configuration information of the packet buffer electronic de-jitter buffer1 comprises 10 data packets, each data packet has header information of 16bit and payload information of 262bit, wherein the size of the data packet corresponds to the format of the data packet; then, in step S1, the data transfer device 1 configures the packet buffer apparatus elastic de-jitter ring 1 by buffering the configuration information.
It will be understood by those skilled in the art that the above-described manner of configuring the packet buffering means is merely exemplary, and other manners of configuring the packet buffering means, now known or hereafter developed, such as may be suitable for use with the present invention, are also included within the scope of the present invention and are hereby incorporated by reference.
In step S2, the data transmission apparatus 1 determines read interval information of a buffered packet in the packet buffer, wherein the buffered packet is to be transmitted between the BBU and the RRU. Specifically, in step S2, the data transmission device 1 first statistically determines a desired time interval between adjacent buffered packets in the packet buffering means by, for example, the reception time interval between adjacent buffered packets in a plurality of consecutive buffered packets transmitted via the PTN; then, according to the expected time interval and the receiving time average value corresponding to the adjacent buffering packets in the same buffering packet window transmitted by the PTN, the initial reading interval information of the buffering packets in the packet buffering device is adjusted to obtain the reading interval information.
For example, assuming that the packet buffer device determined by the data transmission apparatus 1 in step S1 is an elastic de-jitter ring buffer1 which can accommodate 10 packets (packets) with size of 278 bits, and assuming that the time elapsed from the reception of the first packet1 to the continuous reception of the 101 th packet101 by the elastic de-jitter ring buffer1 is 0.1ms, that is, the total receiving time interval between adjacent buffered packets in the 101 consecutive buffered packets is 0.1ms, in step S2, the data transmission apparatus 1 may calculate the expected time interval t between adjacent buffered packets in the multiple consecutive packets by the following formula (6)s：
Wherein,representing the sum of the reception time intervals between adjacent buffered packets from the t (i) th packet to the t (i + n +1) th packet, i.e., n +1 consecutive packets, as in step S2, the data transmission apparatus 1 receives the t (i) th packet from the reception thereof according to the elastic de-jitter ring buffer1 by the above equation (6)The time elapsed from the time when one packet1 received the 101 st packet101 in succession is 0.1ms, and the expected time interval between adjacent buffer packets in elastic de-jitter in buffer1, t, is calculateds0.1ms/100 ═ 1 us; then, in step S2, the data transmission apparatus 1 adjusts the initial read interval information of the buffered packets in the packet buffer according to the expected time interval and the receiving time average value corresponding to the adjacent buffered packets within the same buffered packet window transmitted via the PTN, to obtain the read interval information, for example, in the above example, assuming that the initial read interval information of the buffered packet in the elastic de-jitter ring buffer1 is T, while elastic de-jitter ring buffer1 after every 500 packets are received, i.e., the buffered packet window N is 500, it is necessary to determine the adjustment information for the initial read interval information T, if it is desired to speed up reading the buffered packets, or to slow down reading the buffered packets, or to maintain the existing read rate of the buffered packets, in step S2, the data transmission device 1 may determine the reception time average value by the following equation (7):
where N is the buffered packet window, which may be predetermined or determined by a dynamic moving average algorithm, such as determined by a moving window of moving average, and assuming that the time required for the packet buffer elastic de-jitter in the buffer1 to push forward to the k-499 th packet from the time of receiving the k-th packet, i.e., to receive the 500 packets, is 0.25ms, in step S2, the data transmission apparatus 1 may determine the average value of the receiving time as t (k) by the above equation (7)average0.25ms/500 us/0.5 us; next, in step S2, the data transmission device 1 adjusts the initial read interval information of the buffered packets in the packet buffer by the following formula (8) in conjunction with the reception time average value according to the desired time interval to obtain the read interval information:
Δt(k)＝t(k)average-ts(8)
for example, in step S2, the data transfer device 1 obtains Δ T (k) — 0.5us-1us — -0.5us according to the above formula (8), which indicates that the read rate of the buffered packets in the packet buffer elastic de-jitter buffer1 is faster, and if the initial read interval information T of the buffered packets in the packet buffer elastic de-jitter buffer1 is 2us, the read interval information of the buffered packets in the packet buffer elastic de-jitter buffer1 determined by the data transfer device 1 is T- | Δ T (k) | 1.5us in step S2; for another example, if in step S2, the data transfer device 1 obtains Δ T (k) ═ 0.5us according to the above equation (8), which indicates that the read rate of the buffered packets in the packet buffer apparatus elastic de-jitter ring buffer1 becomes slow, then in step S2, the read interval information of the buffered packets in the packet buffer apparatus elastic de-jitter ring buffer1 determined by the data transfer device 1 is T + | Δ T (k) | 2.5 us.
It will be understood by those skilled in the art that the above-mentioned manner of determining the read interval information of the buffered packets in the packet buffering means is only an example, and other existing or later-occurring manners of determining the read interval information of the buffered packets in the packet buffering means, such as may be applicable to the present invention, are also included in the scope of the present invention and are herein incorporated by reference.
It will be understood by those skilled in the art that the disclosed method for eliminating delay and jitter caused by PTN network can also be applied to the situation of eliminating delay and jitter with larger delay and jitter, such as IP network, and therefore, should be included in the scope of the present invention and is incorporated herein by reference.
It should be understood by those skilled in the art that the above-mentioned manner for determining the read interval information according to the performance index information of data transmission between the BBU and the RRU is only an example, and other existing or future manners for determining the read interval information according to the performance index information of data transmission between the BBU and the RRU, such as being applicable to the present invention, should also be included in the scope of the present invention, and is included herein by reference.
In step S3, the data transmission device 1 reads the corresponding buffer packet from the packet buffer apparatus according to the read interval information, so as to transmit the corresponding buffer packet between the BBU and the RRU. For example, in step S3, the data transmission device 1 reads the corresponding buffer packet from the packet buffer apparatus elastic de-jittering buffer1 according to the read interval information such as T- | Δ T (k) | 1.5us determined in step S2 for transmission between the BBU and the RRU.
The data transmission device 1 is continuously operated between the various steps. Specifically, in step S1, the data transmission device 1 continuously configures a packet buffer in the PTN according to the network traffic model corresponding to the PTN; in step S2, the data transmission apparatus 1 continuously determines the read interval information of the buffered packet in the packet buffer, where the buffered packet is to be transmitted between the BBU and the RRU; in step S3, the data transmission device 1 continuously reads the corresponding buffered packet from the packet buffer according to the read interval information, so as to transmit the buffered packet between the BBU and the RRU. It will be understood by those skilled in the art that "continuously" means that the respective steps of the data transmission apparatus 1 are continuously performing the configuration of the packet buffer, the determination of the reading interval information, and the reading of the buffered packet, respectively, until the data transmission apparatus 1 stops the configuration of the packet buffer for a longer time.
Fig. 5 shows a flowchart of a method for implementing data transmission via a PTN according to a preferred embodiment of the present invention.
Wherein, the data transmission apparatus 1 includes step S1 ', step S2', and step S3 ', wherein the step S2' includes step S21 'and step S22'. Specifically, in step S1', the data transmission device 1 configures a packet buffer in the PTN according to a network traffic model corresponding to the PTN; in step S21', the data transmission apparatus 1 determines a desired time interval between buffered packets in the packet buffering means; in step S22', the data transmission device 1 determines, according to the expected time interval, read interval information corresponding to the buffered packets in the packet buffering means; in step S3', the data transmission device 1 reads the corresponding buffer packet from the packet buffer apparatus according to the read interval information, so as to transmit the corresponding buffer packet between the BBU and the RRU. Here, the contents of step S1 'and step S3' are the same as or similar to the contents of the corresponding steps in the embodiment of fig. 4, and are not repeated for brevity and are included herein by reference.
Specifically, in step S21', the data transmission device 1 determines a desired time interval between adjacent buffered packets in the packet buffer. For example, assuming that in step S1 ', the packet buffer device determined by the data transmission device 1 is an elastic de-jitter ring buffer1 which can accommodate 10 packets (packets) with the size of 278 bits, and assuming that the time elapsed from the reception of the first packet1 to the continuous reception of the 101 th packet101 by the elastic de-jitter ring buffer1 is 0.1ms, that is, the total of the reception time intervals between adjacent buffered packets in the 101 continuous buffered packets is 0.1ms, in step S21', the data transmission device 1 may obtain the expected time interval t between adjacent buffered packets in the plurality of continuous packets by the above formula (6) for the first calculation in step S21 ″s' -0.1 ms/100 ═ 1 us; assuming that the time elapsed from the reception of the first packet1 to the continuous reception of the 201 th packet201 is 0.15ms, that is, the total of the reception time intervals between the adjacent buffered packets in the 201 consecutive buffered packets is 0.15ms, the data transmission device 1 may recalculate the expected time interval t between the adjacent buffered packets in the consecutive packets according to the above equation (6) in step S21sIf "0.15 ms/200 ═ 0.75us, then in step S21', the data transmission device 1 may average the two calculated expected time intervals, i.e., ts＝(ts′+ts"/2 ═ 0.875us is the desired time interval.
Preferably, in step S21', the data transmission device 1 may further transmit the packet according to one of the adjacent buffered packets in the plurality of consecutive buffered packets transmitted via the PTNA desired time interval, statistically determining the desired time interval. For example, assuming that the packet buffer determined by the configuration determining device 11 'is an elastic de-jitter ring buffer1 which can accommodate 10 packets (packets) with size of 278 bits, and assuming that the time elapsed from the reception of the first packet1 to the continuous reception of the 101 th packet101 by the elastic de-jitter ring buffer1 is 10ms, that is, the total receiving time interval between adjacent buffered packets in the 101 consecutive buffered packets is 0.1ms, in step S21', the data transmission device 1 may calculate the expected time interval t between adjacent buffered packets in the consecutive packets by the above equation (6)sIf the time from the reception of the first packet1 to the continuous reception of the 101 th packet101 is 0.1ms according to the elastic de-jitter ring buffer1, the expected time interval between adjacent buffer packets in the elastic de-jitter ring buffer1, i.e., ts＝0.1ms/100＝1us。
It will be appreciated by those skilled in the art that the above-described manner of determining the desired time interval is merely exemplary, and that other existing or future manners of determining the desired time interval, such as may be applicable to the present invention, are intended to be within the scope of the present invention and are hereby incorporated by reference.
Next, in step S22', the data transmission device 1 determines, according to the desired time interval, read interval information corresponding to the buffered packets in the packet buffering means. For example, it is assumed that in step S21', the desired time interval determined by the data transmission device 1 is ts0.875us, in step S22', the data transmission device 1 adjusts the initial read interval information of the buffered packets in the packet buffer according to the expected time interval and the receiving time average value corresponding to the adjacent buffered packets within the same buffered packet window transmitted via the PTN to obtain the read interval information, for example, assuming that the initial read interval information of the buffered packets in the elastic de-jitter ring buffer1 is T, and the elastic de-jitter ring buffer1 is after every 500 packets are received, i.e., the buffered packetsIf the packet window N is 500 and it needs to determine the adjustment information for the initial read interval information T, such as whether it needs to accelerate the reading of the buffered packet, or to slow down the reading of the buffered packet, or to maintain the existing reading rate of the buffered packet, in step S22 ', the data transmission apparatus 1 may first determine the average value of the receiving time by the above formula (7), and assuming that the time required for the packet buffer apparatus elastic de-jitter ring buffer1 to push forward to the k-499 th packet from the reception of the k-th packet is 0.25ms, in step S22', the data transmission apparatus 1 may determine the average value of the receiving time by the above formula (7) as T (k)average0.25ms/500 us/0.5 us; next, in step S22', the data transmission device 1 combines the reception time average values according to the desired time interval, initial read interval information of the buffered packets in the packet buffering means is adjusted by the above equation (8) to obtain the read interval information, for example, in step S22', the data transfer device 1 obtains Δ T (k) of 0.5us-0.875us of-0.375 us according to the above equation (8), which indicates that the read rate of the buffered packets in the packet buffer elastic de-jitter buffer1 is faster, and it is assumed that the initial read interval information T of the buffered packets in the packet buffer elastic de-jitter buffer1 is 2us, then in step S22', the read interval information of the buffered packets in the packet buffer elastic de-jitter ring 1 determined by the data transmission device 1 is T- | Δ T (k) | 1.625 us; for another example, assuming that in step S22 ', the data transfer apparatus 1 obtains Δ T (k) ═ 0.375us according to the above equation (8), which indicates that the read rate of the buffered packets in the packet buffer apparatus elastic de-jitter ring buffer1 becomes slow, then in step S22', the read interval information of the buffered packets in the packet buffer apparatus elastic de-jitter ring 1 determined by the data transfer apparatus 1 is T + | Δ T (k) | 2.375 us.
Preferably, in step S22', the data transmission device 1 may further determine, according to the buffer packet window, a receiving time average value corresponding to an adjacent buffer packet within the same buffer packet window transmitted via the PTN; then, according to the expected time interval and in combination with the average value of the receiving time, the reading interval information corresponding to the buffered packets in the packet buffer device is determined.
For example, assuming that the initial read interval information of the buffered packet in the elastic de-jitter ring buffer1 is T, while elastic de-jitter ring buffer1 after every 500 packets are received, i.e., the buffered packet window N is 500, it is necessary to determine the adjustment information for the initial read interval information T, if it is desired to speed up reading the buffered packets, or to slow down reading the buffered packets, or to maintain the existing read rate of the buffered packets, in step S22', the data transmission device 1 can determine the reception time average value by the above equation (7), assuming that the time required for the packet buffer apparatus elastic de-jitteringbuffer 1 to push forward to the k-499 th packet from the reception of the k-th packet is 0.25ms, the data transmission apparatus 1 may determine the reception time average value as t (k) by the above equation (7) in step S22'.average＝0.25ms/500＝0.5us。
Next, in step S22', the data transmission device 1 combines the reception time average values according to the desired time interval, initial read interval information of the buffered packet in the packet buffering means is adjusted by the above equation (8), to obtain the read interval information, as in step S22', the data transmission device 1 obtains Δ T (k) — 0.5us-1us — -0.5us according to the above equation (8), which indicates that the read rate of the buffered packets in the packet buffer elastic de-jitter ring buffer1 is faster, assuming that the initial read interval information T of the buffered packets in the packet buffer elastic de-jitter ring 1 is 2us, then in step S22', the read interval information of the buffered packets in the packet buffer-jitter ring 1 determined by the data transmission device 1 is T- | Δ T (k) | 1.5 us; for another example, assuming that in step S22 ', the data transfer device 1 obtains Δ T (k) ═ 0.5us according to the above equation (8), which indicates that the read rate of the buffered packets in the packet buffer apparatus elastic de-jitter ring buffer1 becomes slow, then in step S22', the read interval information of the buffered packets in the packet buffer apparatus elastic de-jitter ring buffer1 determined by the data transfer device 1 is T + | Δ T (k) | 2.5 us.
It should be noted that the present invention may be implemented in software and/or in a combination of software and hardware, for example, as an Application Specific Integrated Circuit (ASIC), a general purpose computer or any other similar hardware device. In one embodiment, the software program of the present invention may be executed by a processor to implement the steps or functions described above. Also, the software programs (including associated data structures) of the present invention can be stored in a computer readable recording medium, such as RAM memory, magnetic or optical drive or diskette and the like. Further, some of the steps or functions of the present invention may be implemented in hardware, for example, as circuitry that cooperates with the processor to perform various steps or functions.
In addition, some of the present invention can be applied as a computer program product, such as computer program instructions, which when executed by a computer, can invoke or provide the method and/or technical solution according to the present invention through the operation of the computer. Program instructions which invoke the methods of the present invention may be stored on a fixed or removable recording medium and/or transmitted via a data stream on a broadcast or other signal-bearing medium and/or stored within a working memory of a computer device operating in accordance with the program instructions. An embodiment according to the invention herein comprises an apparatus comprising a memory for storing computer program instructions and a processor for executing the program instructions, wherein the computer program instructions, when executed by the processor, trigger the apparatus to perform a method and/or solution according to embodiments of the invention as described above.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the apparatus claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (13)
1. A method for enabling data transmission via a PTN, wherein the method comprises the steps of:
x, determining parameters of a network flow model corresponding to the PTN according to the system delay/jitter requirement, and configuring a grouping buffer device according to the parameters and system information;
wherein, the method also comprises:
b, determining reading interval information of a buffer packet in the packet buffer device, wherein the buffer packet is transmitted between the BBU and the RRU;
c, reading the corresponding buffer packet from the packet buffer device according to the reading interval information so as to transmit the buffer packet between the BBU and the RRU.
2. The method of claim 1, wherein the step x comprises:
-determining buffering configuration information of the packet buffering means according to a network traffic model corresponding to the PTN;
-configuring said packet buffering means according to said buffering configuration information.
3. The method of claim 1, wherein the step b comprises:
b1 determining a desired time interval between adjacent buffered packets in said packet buffer;
b2 determining the reading interval information corresponding to the buffered packets in the packet buffer device according to the expected time interval.
4. The method of claim 3, wherein the step b1 includes:
-statistically determining said desired time interval from a reception time interval between adjacent buffered packets of a plurality of consecutive buffered packets transmitted via said PTN.
5. The method according to claim 3 or 4, wherein said step b2 comprises:
-determining, from a buffered packet window, a mean value of the reception times corresponding to adjacent buffered packets within the same buffered packet window transmitted via said PTN;
-determining, from said expected time interval and in combination with said average value of the reception times, reading interval information corresponding to buffered packets in said packet buffering means.
6. A data transmission device for enabling data transmission via a PTN, wherein the data transmission device comprises:
the configuration device is used for determining parameters of a network flow model corresponding to the PTN according to the system delay/jitter requirement and configuring the grouping buffer device according to the parameters and the system information;
wherein, this data transmission equipment still includes:
an interval determining device, configured to determine read interval information of a buffered packet in the packet buffering device, where the buffered packet is to be transmitted between the BBU and the RRU;
and the reading device is used for reading the corresponding buffer packet from the packet buffer device according to the reading interval information so as to transmit the buffer packet between the BBU and the RRU.
7. The data transmission apparatus of claim 6, wherein the configuration means is configured to:
-determining buffering configuration information of the packet buffering means according to a network traffic model corresponding to the PTN;
-configuring said packet buffering means according to said buffering configuration information.
8. The data transmission apparatus according to claim 6, wherein the interval determining means comprises:
a desired determination unit for determining a desired time interval between adjacent buffered packets in the packet buffering means;
and the interval determining unit is used for determining the reading interval information corresponding to the buffered packets in the packet buffering device according to the expected time interval.
9. The data transmission device of claim 8, wherein the expectation determination unit is to:
-statistically determining said desired time interval from a reception time interval between adjacent buffered packets of a plurality of consecutive buffered packets transmitted via said PTN.
10. The data transmission device of claim 8 or 9, wherein the interval determination unit is configured to:
-determining, from a buffered packet window, a mean value of the reception times corresponding to adjacent buffered packets within the same buffered packet window transmitted via said PTN;
-determining, from said expected time interval and in combination with said average value of the reception times, reading interval information corresponding to buffered packets in said packet buffering means.
11. A base station, wherein the base station comprises a data transmission apparatus as claimed in any one of claims 6 to 10.
12. A BBU device, wherein the BBU device comprises the data transmission device of any one of claims 6 to 10.
13. An RRU device, wherein the RRU device comprises the data transmission device of any of claims 6 to 10.
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