WO2016058316A1 - 通过光通道传输单元信号发送、接收信号的方法及装置 - Google Patents
通过光通道传输单元信号发送、接收信号的方法及装置 Download PDFInfo
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- WO2016058316A1 WO2016058316A1 PCT/CN2015/073817 CN2015073817W WO2016058316A1 WO 2016058316 A1 WO2016058316 A1 WO 2016058316A1 CN 2015073817 W CN2015073817 W CN 2015073817W WO 2016058316 A1 WO2016058316 A1 WO 2016058316A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
Definitions
- the present invention relates to the field of communications, and in particular, to a method and a device for transmitting and receiving signals through an optical channel transmission unit signal.
- OTN Optical Transport Network
- Various other signals besides, such as SDH signals, Ethernet signals, Fibre channel signals, various Packet signals, and the like.
- the OTUk signal is composed of OTUk frames.
- the remaining part of the OTUk frame after the OTUk overhead is removed is called the optical channel data unit ODUk frame.
- the remaining part of the ODUk frame after the ODUk overhead is removed is called the optical channel payload unit OPUk frame, and the OPUk frame is removed from the OPUk frame.
- the remaining part after the overhead is called OPUk payload.
- the OPUk payload can be used to install a non-OTN signal or multiple low-speed ODUi (i ⁇ k) signals.
- the signal composed of ODUk frames is called ODUk signal.
- Figure 1 shows the relationship between OTUk frames and ODUk frames, OPUk frames, and OPUk payloads.
- the mapping methods used by the non-OTN signal to the OPUk payload are mainly AMP (Asynchronous Mapping Procedure), BMP (Bit-synchronous Mapping Procedure) and GMP. (Generic Mapping Procedure), in which the use of BMP is very limited, that is, the OTUk and non-OTN signal rates are required to be fully synchronized and the rate ratios are in a specific relationship.
- AMP and GMP do not require OTUk and non-OTN signal rate synchronization, especially It is GMP, which is the main method for loading non-OTN signals or low-speed ODUi signals (i ⁇ k) into OTUk.
- the existing optical transport network signal definitions specify various Packet signals through GFP-F.
- the (Frame mapped Generic Framing procedure) map is loaded into ODUflex (GFP) and loaded into the time slot of OPUk.
- a plurality of low-speed ODUi (i ⁇ k) signals are loaded into the OPUk by dividing the OPUk payload into n time slots, and then loading the ODUi into one of the OPUk payloads or Among multiple time slots, time slots are implemented by interleaving bytes.
- the OPUk payload is a 4-row, 3808-byte byte block with column numbers from 17 to 3824 (the first 17 columns correspond to OTUk overhead, ODUk overhead, and OPUk overhead). The row number ranges from 1 to 4.
- a small box in Figure 2 represents One byte, the OPUk payload area of an OPUk frame is composed of 4*3808 bytes, arranged in 4 rows and 3808 columns as shown in FIG.
- Figure 2 shows the case where the OPUk payload is divided into 4 slots by byte interleaving, that is, in column 3808, starting from column 17, a group of 4 adjacent bytes, 4 in each group
- the bytes are divided into 4 different time slots TS1, TS2, TS3, TS4, that is, 4 consecutive bytes starting from column 17 respectively represent 4 time slots, so that all 4*3808 bytes in the OPUk payload It is divided into 4 time slots, named TS1, TS2, TS3, TS4, respectively.
- the OPU4 payload in the OTU4 of the 100G rate is divided into 80 time slots. Since the minimum ODUk in the optical transport network is ODU0 and the rate is 1.25G, it is theoretically said that the OPUk payload in all rate OTUk frames should be divided into 1.25G granular time slots, so that the ODU0 can be loaded most efficiently.
- the OTUk rate is high, for example, the OTU4 rate is 100G, dividing the time slot according to the 1.25G granularity will result in a large number of time slots. For example, the OPU4 payload of the OTU4 needs to be divided into 80 time slots, and too many time slots result in multiple low speeds.
- ODUi(i ⁇ k) is very difficult to implement when loading OTUk.
- Embodiments of the present invention provide a method and an apparatus for transmitting and receiving signals through an optical channel transmission unit signal, so as to reduce the difficulty in realizing the division of multiple subspaces by OPUk.
- an embodiment of the present invention provides a method for transmitting a signal by using an optical channel transmission unit, including:
- a low-speed ODUi signal or a non-OTN signal is loaded into a logical channel in the OPUk payload; a low-speed ODUi signal or a non-OTN signal is loaded into one of the logical channels; and each of the logical channels is loaded with at most one of the low-speed ODUi Signal or non-OTN signal;
- the logical channel is composed of a logical channel unit, where the logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead; the logical channel unit overhead includes at least the number of the logical channel; All of the space in the logical channel unit payload is used to load the low speed ODUi signal or the non-OTN signal; all contents of the OPUk payload belong to each logical channel;
- Loading a low-speed ODUi signal or a non-OTN signal into a logical channel in the OPUk payload means: loading a low-speed ODUi signal or a non-OTN signal into a logical channel unit payload located in the OPUk payload;
- the method further includes:
- the logical channel unit overhead is loaded into one or more of an OPUk overhead, an ODUk overhead, and an OPUk payload.
- one of the logical channel units occupies one OPUk frame, where a logical channel unit payload of the logical channel unit occupies an OPUk payload, and a logical channel unit overhead of the logical channel unit occupies an OPUk overhead, or an ODUk overhead, Or part of the OPUk payload.
- one of the logical channel units occupies a part of an OPUk frame, wherein a logical channel unit payload of the logical channel unit occupies a part of an OPUk payload; a logical channel unit overhead of the logical channel unit occupies an OPUk overhead, Or part of the ODUk overhead, or OPUk payload.
- occupying a part of an OPUk frame by one of the logical channel units means:
- a logical channel unit payload in one of the logical channel units occupies one row in the OPUk payload,
- the logical channel unit overhead of the logical channel unit occupies one row in the OPUk overhead.
- the method further includes:
- the OPUk payload calculate the sum X of the bandwidths of all logical channel unit payloads for loading the low speed ODUi signal or the non-OTN signal, if X plus the logical channel unit overhead that may exist in the OPUk payload.
- the sum of the occupied bandwidths Y is smaller than the bandwidth of the OPUk payload, and the special logical channel unit payload is filled in the bandwidths other than X and Y in the bandwidth of the OPUk payload.
- the step of loading the low-speed ODUi signal or the non-OTN signal into the logical channel in the OPUk payload further includes:
- the length of time T is calculated by the number of reference clocks, and the reference clock refers to a clock obtained by dividing the OTUk signal clock.
- the embodiment of the invention further provides a method for receiving a signal by using an optical channel transmission unit signal, including:
- a low speed ODUi signal or a non-OTN signal is recovered from the logical channel.
- the logical channel is composed of a logical channel unit, where the logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead; the logical channel unit overhead includes at least the number of the logical channel; All of the space in the logical channel unit payload is used to load the low speed ODUi signal or the non-OTN signal; all contents of the OPUk payload belong to each logical channel;
- Recovering the low speed ODUi signal or the non-OTN signal from the logical channel includes:
- a low speed ODUi signal or a non-OTN signal is recovered from the logical channel unit payload located in the OPUk payload according to the logical channel unit overhead.
- the method further includes:
- the rate adjustment overhead is that the number of bytes received by the transmitting end is the logical channel.
- An embodiment of the present invention further provides an apparatus for transmitting a signal by using an optical channel transmission unit, including:
- a loading module configured to load a low speed ODUi signal or a non-OTN signal into a logical channel in the OPUk payload; a low speed ODUi signal or a non-OTN signal is loaded into one of the logical channels; each of the logical channels is loaded One of the low speed ODUi signals or non-OTN signals;
- a framing module configured to combine the OPUk payload with an OPUk overhead, an ODUk overhead, and an OTUk overhead to form an OTUk frame;
- a sending module configured to send an OTUk signal consisting of the OTUk frame.
- the logical channel is composed of a logical channel unit, where the logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead; the logical channel unit overhead includes at least the number of the logical channel; All of the space in the logical channel unit payload is used to load the low speed ODUi signal or the non-OTN signal; all contents of the OPUk payload belong to each logical channel;
- the loading module loading the low-speed ODUi signal or the non-OTN signal into the logical channel in the OPUk payload means that the loading module loads the low-speed ODUi signal or the non-OTN signal to the logical channel unit payload located in the OPUk payload.
- the load module is further configured to load the logical channel unit overhead into one or more of an OPUk overhead, an ODUk overhead, and an OPUk payload.
- the loading module is further configured to: after loading the low-speed ODUi signal or the non-OTN signal into the logical channel in the OPUk payload, calculate, in the OPUk payload, all of the signals for loading the low-speed ODUi or non- The sum of the bandwidths of the logical channel unit payloads of the OTN signal X; if the sum of the bandwidth Y occupied by the logical channel unit overhead that may exist in the X plus OPUk payload is less than the bandwidth of the OPUk payload, then the OPUk payload The bandwidth of the special logical channel unit is filled in the bandwidth other than X and Y.
- the loading module is further configured to calculate, when the low-speed ODUi signal or the non-OTN signal is loaded into the logical channel in the OPUk payload, the number of received bytes is the logical channel unit payload byte.
- the time length T of the low-speed ODUi signal or the non-OTN signal, and the time length T is used as the rate adjustment overhead of the corresponding logical channel when the low-speed ODUi signal or the non-OTN signal is loaded into the logical channel.
- the time length T is calculated by the number of reference clocks, and the reference clock refers to a clock obtained by dividing the OTUk signal clock.
- An embodiment of the present invention further provides an apparatus for receiving a signal by using an optical channel transmission unit signal, including:
- a receiving module configured to receive an OTUk signal to obtain an OTUk frame
- Decomposing a module configured to decompose the OTUk frame to obtain a logical channel
- the recovery module is configured to recover a low speed ODUi signal or a non-OTN signal from the logical channel.
- the logical channel is composed of a logical channel unit, where the logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead; the logical channel unit overhead includes at least the number of the logical channel; All of the space in the logical channel unit payload is used to load the low speed ODUi signal or the non-OTN signal; all contents of the OPUk payload belong to each logical channel;
- the recovery module recovers a low speed ODUi signal or a non-OTN signal from the logical channel.
- the recovery module obtains a logical channel unit overhead from one or more of an OPUk overhead, an ODUk overhead, and an OPUk payload; and recovers from a logical channel unit payload located in an OPUk payload according to the logical channel unit overhead Low speed ODUi signal or non-OTN signal.
- the device further includes:
- Extracting a module configured to extract a rate adjustment overhead from the logical channel unit overhead
- the recovery module is further configured to adjust the cost of the low-speed ODUi signal or the non-OTN signal according to the rate adjustment overhead, the reference clock, and the logical channel unit payload byte number; the rate adjustment overhead refers to the sender receiving the word.
- the number of sections is the length of time T used by the low-speed ODUi signal or the non-OTN signal of the logical channel unit payload byte number, and the time length T is calculated by the number of the reference clocks;
- the OTUk signal clock is divided by the divided clock.
- An embodiment of the present invention further provides a computer readable storage medium, where the storage medium stores a computer program, the computer program includes program instructions, when the program instruction is executed by a device that transmits a signal through an optical channel transmission unit signal,
- the apparatus can perform the above method of transmitting a signal through an optical channel transmission unit signal.
- the embodiment of the present invention further provides a computer readable storage medium, where the storage medium stores a computer program, the computer program includes program instructions, when the program instruction is executed by a device that receives a signal through an optical channel transmission unit signal,
- the apparatus can perform the above method of receiving a signal through an optical channel transmission unit signal.
- Embodiments of the present invention relate to a completely new implementation manner of an optical transport network.
- non-OTN signals refer to signals other than OTUk and ODUk
- ODUi i ⁇ k
- the method of loading into the OPUk payload is improved, and after the improvement described in the embodiment of the present invention, the OPUk payload partition can be realized with a lower hardware cost in the optical transport network signal having a rate of 100 G or more, and
- the bandwidth of the subspace obtained by dividing the OPUk payload is an arbitrary value smaller than the OPUk payload bandwidth, so that multiple ODUis can be more efficiently and simply loaded into the optical transport network signal without substantially changing the existing light.
- Signal junction of the transmission network signal Structure is an arbitrary value smaller than the OPUk payload bandwidth
- the embodiment of the present invention further provides a new non-OTN signal or a low-speed ODUi signal (i ⁇ k) loaded into the OPUk payload (note, the meaning of loading into the OPUk payload and loading into the OTUk is the same because the OPUk payload It is a method of frame-based mapping procedure (FMP), which is part of OTUk, which reduces the hardware implementation difficulty of mapping and demapping of non-OTN signals and ODUi signals into OPUk.
- FMP frame-based mapping procedure
- the hardware cost required to implement this method is lower, and the clock recovery effect when the non-OTUk or low-speed ODUi signal is recovered after OTUk transmission and then recovers the non-OTUk or low-speed ODUi signal is basically the same as GMP.
- AMP AMP
- the logic channel-based OPUk payload space division scheme provided by the embodiment of the present invention and the above FMP mapping can reduce the hardware implementation difficulty, so that the OTUC signal of the OTN signal larger than 100G under the existing hardware condition can also support the 1.25G granularity.
- the method for dividing an OPUk payload based on a logical channel includes the following manners: the time slot mode divides the OPUk payload space, and the manner in which the non-OTUk or the low-speed ODUi is loaded into the time slot in the OPUk payload or the OPUk payload by using the AMP and the GMP mapping.
- the OPUk logical channel occupies one whole frame or a part of an entire frame (for example, one line) in the high-speed OPUk
- the logical channel of the OPUk payload is processed inside the chip, which corresponds to one logical cycle corresponding to one logical channel.
- the instant sub-multiplexing mode there is no need to perform the complex conversion of the space division to the time division and then the space division.
- multiple time slots correspond to one clock cycle, that is, the space division multiplexing mode, and it is necessary to perform the space division to the time division and then to the time division.
- the complex conversion of space division results in high hardware implementation cost, and directly causes the time slot of the OTUk signal larger than 100G to be smaller than the granularity of less than 10G, and the logical channel under the present invention can ensure that the time slot of the OTUk signal larger than 100G is smaller than Or equal to 1.25G granularity, reducing the difficulty of OPUk partitioning multiple subspaces, ensuring that OTN signals greater than 100G can achieve more subspace partitioning with a comparable or lower hardware cost.
- the subspace obtained by the slot-based subspace partitioning method is a fixed bandwidth, and does not support the flexible bandwidth.
- the embodiment of the present invention uses the logical channel to divide the OPUk.
- the bandwidth of the subspace obtained after the payload space is a flexible bandwidth, that is, the bandwidth of a certain logical channel may be any value that does not exceed the OPUk payload bandwidth, and the subspace obtained by dividing the OPUk payload according to the slot in the existing standard is
- the rigid bandwidth, that is, the subspace bandwidth is an integer multiple of the slot bandwidth.
- the subspace bandwidth obtained by dividing the subspace by OPUk must be an integer multiple of 1.25G, so that some ODUi signals are loaded in the subspace. Since the bandwidth of the ODUi is slightly higher than the integer multiple of 1.25G, there may be a waste of bandwidth of nearly one time slot bandwidth. Flexible bandwidth can further increase bandwidth utilization, and in theory can squeeze out the space of each bit in the OPUk payload.
- FIG. 1 is a schematic diagram of a frame structure of an OTUk
- FIG. 2 is a schematic diagram of dividing an OPUk payload into four time slots in a conventional optical transmission standard
- FIG. 3 is a schematic flow chart of a method for transmitting a signal by using an optical channel transmission unit according to an embodiment of the present invention
- FIG. 4 is a schematic diagram of logical channel division according to an embodiment of the present invention.
- Embodiments of the present invention provide a method for transmitting a signal by using an optical channel transmission unit signal, such as As shown in Figure 3, it includes:
- a low-speed ODUi signal or a non-OTN signal is loaded into a logical channel in the OPUk payload; a low-speed ODUi signal or a non-OTN signal is loaded into one of the logical channels; and each of the logical channels is loaded with at most one of the low-speed ODUi Signal or non-OTN signal;
- the generation method gives a new subspace division scheme in the optical transport network, wherein the optical transport network signal is also called OTUk (k is an integer, different k values represent different signal rates) signals, and is composed of OTUk frames.
- the OTUk frame is composed of OTUk overhead, ODUk overhead, OPUk overhead and OPUk payload.
- the ODUk overhead plus OPUk overhead plus OPUk payload constitutes the ODUk frame
- the OPUk overhead plus the OPUk payload constitutes the OPUk frame
- the OPUk payload can be used as a whole space.
- each logical channel has A logical channel number, which can identify different logical channels according to the logical channel number.
- the bandwidth of each logical channel can be any value less than or equal to the OPUk payload bandwidth, and a special logical channel is used as the rate filling channel; a low-speed ODUi (i ⁇ k) signals or non-OTN signals can only be loaded into one logical channel.
- Each logical channel can only be equipped with one low-speed ODUi (i ⁇ k) signal or non-OTN signal.
- the logical channel is composed of a logical channel unit, where the logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead; the logical channel unit overhead includes at least a logical channel number, and the logical channel number can be used to identify different a logical channel unit; the logical channel unit overhead is located in an OPUk overhead or an ODUk overhead or an OPUk payload; the logical channel unit payload is located in an OPUk payload, and all contents of the OPUk payload belong to each logical channel. All of the space in the logical channel unit payload is used to hold the low speed ODUi (i ⁇ k) signal or non-OTN signal.
- the loading of the low-speed ODUi signal or the non-OTN signal into the logical channel in the OPUk payload means: loading the low-speed ODUi signal or the non-OTN signal into the logical channel unit payload located in the OPUk payload;
- the method may further include:
- the logical channel unit overhead is loaded into one or more of an OPUk overhead, an ODUk overhead, and an OPUk payload.
- one of the logical channel units may occupy one OPUk frame, where the logical channel unit payload occupies an OPUk payload, and the logical channel unit overhead occupies an OPUk overhead, or an ODUk overhead, or a part of an OPUk payload.
- one of the logical channel units may occupy a part of an OPUk frame, where the logical channel unit payload occupies a part of the OPUk payload; the logical channel unit overhead occupies an OPUk overhead, or an ODUk overhead, or a part of an OPUk payload .
- a possible case where one of the logical channel units occupies a part of an OPUk frame is: a logical channel unit payload in the logical channel unit occupies one row in an OPUk payload, and correspondingly, the logical channel The logical channel unit overhead in a cell occupies one row in the OPUk overhead.
- the special logical channel functions to achieve rate filling.
- the loading of the low-speed ODUi signal or the non-OTN signal into the logical channel in the OPUk payload may further include: in an OPUk payload, all of the low-speed ODUi (i ⁇ k) signals or non-OTNs for loading the described
- the sum of the bandwidths of the logical channel unit payloads of the signal or non-OTN signal is the bandwidth difference between
- the sum of the bandwidths of all the logical channel unit payloads for loading the low-speed ODUi signal or the non-OTN signal, plus the bandwidth of the special logical channel unit payload, plus all that may be included in the OPUk payload The bandwidth occupied by the logical channel unit overhead is exactly equal to the bandwidth occupied by the OPUk payload.
- the logical channel unit overhead is not located in the OPUk payload, and the bandwidth occupied by all logical channel unit overheads that may be included in the OPUk payload is zero.
- the step of loading the low-speed ODUi signal or the non-OTN signal into the logical channel in the OPUk payload may further include: calculating the foregoing low speed that the number of received bytes is the number of bytes of the logical channel unit payload
- the time length T used by the ODUi (i ⁇ k) signal or the non-OTN signal, and the time length T is used as the rate adjustment overhead of the corresponding logical channel when the low-speed ODUi (i ⁇ k) signal or the non-OTN signal is loaded into the logical channel. , put into the logical channel unit overhead.
- the length of time T is calculated by measuring the number of reference clocks, where the reference clock refers to a clock obtained by dividing the OTUk signal clock.
- the method of dividing OPUi into n time slots is adopted, and the time slots are implemented by using byte interleaving, in OPUk.
- the rate is low and the number of time slots is small, the hardware implementation requires little cost.
- the OPUk rate is high, for example, the OPU4 rate is about 100 Gbps.
- the time slot needs to be divided into 80 time slots according to 1.25G particles.
- the slot division is also implemented in the manner of inter-byte interpolation, that is, starting from the first byte of the OPUk payload, 80 consecutive bytes are respectively used as 80 slots, and the subsequent consecutive 80 bytes are still used as 80 slots.
- One time slot that is, two consecutive bytes of a certain time slot are separated by 80 bytes in the OPUk payload, and the highest clock rate inside the chip is realized when the time slot processing in the OPUk payload is implemented inside the chip.
- it is only about 700MHz, so the 100G OPU4 payload is actually composed of a clock of about 700MHz plus a data signal of about 20 bytes wide, so that 20 clocks of data will appear simultaneously in one clock cycle, which is quite equivalent in chip processing.
- space division multiplexing that is, not to be processed The same content on different signal lines within one clock cycle, which causes the chip to increase the difficulty of processing time slots.
- the embodiment of the invention can achieve 20 bytes of data in one clock cycle all belong to one logical channel, so the processing of the logical channel can be realized by a set of hardware time-sharing processing, which is equivalent to time division multiplexing, which will greatly Simplify the implementation of hardware.
- most chips need to convert different time slots in one clock cycle into one time slot corresponding to one time slot, that is, space-divided time-division, and then turn to The space division finally forms the OPUk payload. If the time slot division of the OPUk payload can be realized in a time division manner, the mutual conversion of the above time division and the space division can be removed, thereby saving a large amount of processing resources inside the chip.
- the method for realizing OPUk space division by using a logical channel in the embodiment of the present invention can make OPUk payload processing directly corresponds to time division processing, eliminating the need for complex time division and space division conversion.
- the concept of a logical channel is introduced in an OPUk frame, that is, a transmission bandwidth corresponding to an OPUk payload is divided into n sub-bandwidths by logical channels (that is, the OPUk payload is divided into multiple sub-spaces), and each The actual bandwidth of the sub-bandwidth may be any value less than the OPUk payload bandwidth, and the bandwidth of all n sub-bandwidths is less than or equal to the OPUk payload bandwidth.
- the logic channel is used to install low-speed ODUi or non-OTN signals.
- a logic channel must be installed with only one low-speed ODUi or one non-OTN signal.
- the logical channel in the present invention is equivalent to the time slot of the OPUk payload defined in the existing optical transmission standard, but the bandwidth corresponding to the logical channel in the embodiment of the present invention is flexible and can be less than the OPUk payload bandwidth. Any value, while the bandwidth of the time slot in the existing standard is a fixed value.
- the logical channel is identified by the logical channel number, and the logical channel number of the logical channel loaded with the non-OTN signal or the low-speed ODUi signal is an integer greater than 1 and less than M, and M is a fixed value, which may be according to OPUk.
- the payload bandwidth and the minimum value of the desired logical channel bandwidth are determined.
- the logical channel numbered 0 is a special logical channel, which is specifically used to implement rate padding.
- the logical channel numbered 0 is named IDLE channel, and its function is similar to IDLE in the Ethernet MAC frame. frame.
- the logical channel is composed of a plurality of logical channel units, each logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead, and the logical channel unit payload is used to be loaded into the OPUk payload.
- the non-OTN signal or the ODUi (i ⁇ k) signal is located in the OPUk payload; the logical channel unit overhead is used to maintain the management logical channel, and the content includes at least the logical channel number and the rate adjustment overhead, wherein the rate adjustment overhead is generated by the FMP mapping
- the logical channel number is used to identify different logical channels, and the logical channel unit overhead is located in the OPUk or ODUk overhead or OPUk payload.
- All bandwidth of the OPUk payload is fully occupied by the logical channel unit payload of each logical channel and the logical channel unit overhead that may exist in the OPUk payload, that is, all bytes of the OPUk payload belong to the logical channel of a certain logical channel.
- the multiple logical channel unit payloads that make up a logical channel are not necessarily next to each other in the OPUk payload.
- one logical channel unit is composed of one OPUk frame, that is, one logical channel
- the logical channel unit payload of the track unit corresponds to the OPUk payload in one OPUk frame
- the logical channel unit overhead corresponds to the partial OPUk overhead in the OPUk frame
- the individual bytes in the OPUk overhead need to be reserved for the logical channel unit overhead.
- the OPUk frame is continuously transmitted.
- Each OPUk frame corresponds to one logical channel unit, and each logical channel unit is identified by a logical channel number.
- the multiframe alignment signal MFAS values of consecutive three frames of OTUk frames respectively correspond to 0.
- which logical channel belongs to an OPUk frame adopts an on-demand allocation manner, that is, when there are m ODUis (i ⁇ k) to load the OPUk payload, first allocate a logical channel to each ODUi. No. Different ODUis must be assigned different logical channel numbers. The logical channel number will become the identifier for identifying these ODUis in the OPUk payload.
- the number of bytes received by an ODUi reaches 15232, it depends on whether the current OPUk frame is idle. The received 15232 bytes of this ODUi are loaded into the 15232 bytes in the current OPUk frame. If the current OPUk frame is being loaded with the ODUi, it waits until the OPUk frame is idle, so that the bandwidth of the OPUk payload is greater than m. The bandwidth of the ODUi, then the m ODUis can always be loaded into the OPUk payload in an appropriate manner. If an OPUk frame is idle and there is really no ODUi waiting to be loaded into the OPUk payload, then the OPUk frame is The logical channel number is set to 0, this O The PUk frame corresponds to the IDLE channel.
- the logical channel unit is composed of one OPUk frame.
- each ODUi must buffer 4*3808 bytes of a logical channel unit payload before loading OPUk. In the frame, this may require at least n buffers of 4*3808 bytes.
- this buffer is large, which leads to the hardware implementation cost. Because the buffer is too large, it increases the delay of processing ODUi. Big.
- the present invention provides another embodiment, that is, the logical channel unit is composed of a part of the OPUk frame, for example, one row in the OPUk frame is used as a logical channel unit, that is, each logical channel unit payload is occupied.
- the OTUk frame no longer maintains the 4 rows and 4080 columns specified by the current standard, but instead consists of one frame consisting of M rows and N columns, and the logical channel unit is composed of one OPUk frame or a part of the OPUk frame. In special cases, some of the logical channel unit overhead may also be located somewhere in the OPUk payload.
- the clock frequency information must also be saved, so that when the non-OTUk or ODUi signal is recovered from the logical channel of the OPUk payload, It can recover its clock frequency at the same time to ensure its clock transmission.
- both the AMP and the GMP can record the clock frequency information through the rate adjustment overhead.
- the embodiment of the present invention must also provide a similar method. For this reason, the FMP mapping is proposed in this embodiment of the present invention. The frequency transparency of OTUk and low-speed ODUi after OTUk transmission.
- the OTUk clock needs to be divided into Fm as a reference clock, where Fm is an integer, according to the OTUk clock.
- the number Cm then put the received B-byte signal into the corresponding logical channel unit payload in an idle OPUk frame, and put the Cm value into the logical channel unit in the OPUk overhead or the ODUk overhead or the OPUk payload.
- the OTUk clock, Fm, B, and Cm values can be recovered in this low speed clock signal or a non-OTN ODUi signal, and clock recovery effect substantially equivalent to AMP and GMP mapping.
- the embodiment of the invention further provides a method for receiving a signal by using an optical channel transmission unit signal, including:
- a low speed ODUi signal or a non-OTN signal is recovered from the logical channel.
- the logical channel is composed of logical channel units, and the logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead; the logical channel unit overhead includes at least a logical channel number; and the logical channel unit payload All of the space in the space is used to install the low-speed ODUi signal or non-OTN signal; all contents of the OPUk payload belong to each logical channel;
- Recovering the low speed ODUi signal or the non-OTN signal from the logical channel includes:
- a low speed ODUi signal or a non-OTN signal is recovered from the logical channel unit payload located in the OPUk payload according to the logical channel unit overhead.
- the method can also include:
- the rate adjustment overhead is that the number of bytes received by the transmitting end is the logical channel.
- the embodiment of the present invention further provides an apparatus for transmitting a signal by using an optical channel transmission unit, including a processor, a program storage device, and a data storage device, and further comprising:
- a loading module adapted to load a low speed ODUi signal or a non-OTN signal into a logical channel in the OPUk payload; a low speed ODUi signal or a non-OTN signal is loaded into one of the logical channels; each of the logical channels is loaded One of the low speed ODUi signals or non-OTN signals;
- a framing module configured to combine the OPUk payload with an OPUk overhead, an ODUk overhead, and an OTUk overhead to form an OTUk frame;
- a sending module configured to send an OTUk signal consisting of the OTUk frame.
- the logical channel is composed of logical channel units, and the logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead; the logical channel unit overhead includes at least a logical channel number; and the logical channel unit payload All of the space in the space is used to install the low-speed ODUi signal or non-OTN signal; all contents of the OPUk payload belong to each logical channel;
- the loading module loading the low-speed ODUi signal or the non-OTN signal into the logical channel in the OPUk payload means that the loading module loads the low-speed ODUi signal or the non-OTN signal to the logical channel unit payload located in the OPUk payload. in;
- the load module may be further adapted to load the logical channel unit overhead into one or more of an OPUk overhead, an ODUk overhead, and an OPUk payload.
- the loading module may be further configured to: after loading the low-speed ODUi signal or the non-OTN signal into the logical channel in the OPUk payload, calculate the OPUk payload, all used to install the low-speed ODUi signal or non-OTN
- the sum of the bandwidths of the logical channel unit payloads of the signals X; the bandwidth Y occupied by the logical channel unit overhead that may exist in the X plus OPUk payload is less than the bandwidth of the OPUk payload, in the bandwidth of the OPUk payload
- the special logical channel unit payload is filled in the bandwidth other than X and Y.
- the loading module may be further configured to calculate, when the low-speed ODUi signal or the non-OTN signal is loaded into the logical channel in the OPUk payload, the number of bytes received is the number of bytes of the logical channel unit payload.
- the time length T used by the low-speed ODUi signal or the non-OTN signal, and the time length T is used as the rate adjustment overhead of the corresponding logical channel when the low-speed ODUi signal or the non-OTN signal is loaded into the logical channel.
- the time length T is calculated by the number of reference clocks, and the reference clock refers to a clock obtained by dividing the OTUk signal clock.
- the embodiment of the present invention further provides an apparatus for receiving a signal by using an optical channel transmission unit signal, including a processor, a program storage device, and a data storage device, and further includes:
- a receiving module configured to receive an OTUk signal and obtain an OTUk frame
- a decomposition module configured to decompose the OTUk frame to obtain a logical channel
- the recovery module is adapted to recover a low speed ODUi signal or a non-OTN signal from the logical channel.
- the logical channel is composed of logical channel units, and the logical channel unit is composed of a logical channel unit payload and a logical channel unit overhead; the logical channel unit overhead includes at least a logical channel number; and the logical channel unit payload All of the space in the space is used to install the low-speed ODUi signal or non-OTN signal; all contents of the OPUk payload belong to each logical channel;
- the recovering module recovering the low speed ODUi signal or the non-OTN signal from the logical channel means:
- the recovery module obtains a logical channel unit overhead from one or more of an OPUk overhead, an ODUk overhead, and an OPUk payload; and recovers from a logical channel unit payload located in an OPUk payload according to the logical channel unit overhead Low speed ODUi signal or non-OTN signal.
- the apparatus may further include an extraction module adapted to extract a rate adjustment overhead from the logical channel unit overhead;
- the recovery module may be further configured to adjust a cost of the low-speed ODUi signal or the non-OTN signal according to the rate adjustment overhead, the reference clock, and the logical channel unit payload byte number;
- the rate adjustment overhead is that the sending end receives the
- the number of bytes is the length of time T used by the low-speed ODUi signal or the non-OTN signal of the logical channel unit payload byte number, and the time length T is calculated by the number of the reference clock;
- the reference clock refers to The OTUk signal clock is divided by a clock.
- the technical solution provided by the embodiment of the present invention is to install a low-speed ODUi signal or a non-OTN signal into a logical channel in an OPUk payload, and install at most one low-speed ODUi signal or non-OTN signal in each logical channel, and store the OPUk payload.
- Adding OPUk overhead, ODUk overhead and OTUk overhead to form an OTUk frame and then transmitting it can reduce the difficulty of OPUk partitioning multiple subspaces.
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Abstract
一种通过光通道传输单元信号发送、接收信号的方法和装置；发送方法包括：将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中；一个低速ODUi信号或非OTN信号装到一个所述逻辑通道中；每个所述逻辑通道中最多装一个所述低速ODUi信号或非OTN信号；将所述OPUk净荷加上OPUk开销、ODUk开销和OTUk开销组成OTUk帧；发送所述OTUk帧组成的OTUk信号。本发明实施例能够降低OPUk划分多个子空间的实现难度。
Description
本发明涉及通信领域，尤其涉及一种通过光通道传输单元信号发送、接收信号的方法及装置
光传送网(OTN，Optical Transport Network)标准由国际电信联盟(ITU-T)制定，是光传输设备的重要标准，现在几乎所有的长距传输网络都由基于光传送网标准的设备组成。
光传送网有其标准的信号格式光通道传输单元OTUk(k＝1,2,3,4)，OTUk用来装各种非OTN信号或多个低速ODUi(i＝0,1,2,2e,3,4,flex)信号，且ODUi速率比ODUk速率低，以后用低速ODUi(i<k)信号表示比ODUk速率低的ODUi信号；其中非OTN信号指除了OTUk信号、ODUk信号和ODUi信号以外的各种其他信号，例如SDH信号，以太网信号，Fibre channel信号，各种Packet信号等。OTUk信号由OTUk帧组成，OTUk帧中去掉OTUk开销后剩下的部分叫做光通道数据单元ODUk帧，ODUk帧中去掉ODUk开销后剩下的部分叫光通道净荷单元OPUk帧，OPUk帧去掉OPUk开销后剩下的部分叫OPUk净荷，OPUk净荷可用来装一个非OTN信号或多个低速ODUi(i<k)信号，由ODUk帧组成的信号叫ODUk信号。图1为OTUk帧和ODUk帧、OPUk帧和OPUk净荷的关系。
在现有光传送网信号定义中，非OTN信号装到OPUk净荷使用的映射方法主要有AMP(Asynchronous Mapping Procedure，异步映射规程)，BMP(Bit-synchronous Mapping Procedure，比特同步映射规程)和GMP(Generic Mapping Procedure，通用映射规程)，其中BMP的使用有很大限制，即要求OTUk和非OTN信号速率完全同步且速率比值符合特定关系，AMP和GMP不要求OTUk和非OTN信号速率同步，尤其是GMP，是非OTN信号或低速ODUi信号(i<k)装到OTUk中的主要方法。对于非OTN信号中的Packet信号，现有光传送网信号定义中规定各种Packet信号通过GFP-F
(Frame mapped Generic Framing procedure)映射装到ODUflex(GFP)中，再装到OPUk的时隙中。
在现有光传送网的定义中，多个低速ODUi(i<k)信号装到OPUk中的方法是将OPUk净荷划分为n个时隙，然后将ODUi装入OPUk净荷中的一个或多个时隙中，时隙以字节间插的方式实现。OPUk净荷是一个4行3808列的字节块，列号从17到3824(前17列对应OTUk开销、ODUk开销和OPUk开销)，行号从1到4，图2中一个小方框代表一个字节，一个OPUk帧的OPUk净荷区由4*3808个字节组成，排成如图2所示的4行3808列。图2表示OPUk净荷被以字节间插的方式划分为4个时隙时的情况，即在3808列中，从列17开始，相邻的4个字节一组，每组中的4个字节分别划分到4个不同的时隙TS1，TS2，TS3，TS4，即从列17开始连续的4个字节分别表示4个时隙，这样OPUk净荷中的所有4*3808字节被划分为4个时隙，分别命名为TS1，TS2，TS3，TS4，m个时隙可以装一个ODUi(m小于OPUk净荷中的最大时隙数n，图2中n＝4)。
按照现有的光传送网标准G.709-2009，100G速率的OTU4中的OPU4净荷被划分为80个时隙。由于光传送网中最小的ODUk为ODU0，速率为1.25G，这样理论上说所有速率的OTUk帧中的OPUk净荷都应该划分为1.25G粒度的时隙，这样能够最高效的装下ODU0，但当OTUk速率很高时，例如OTU4速率为100G，按照1.25G粒度划分时隙会导致时隙数量很多，例如OTU4的OPU4净荷中需要划分80个时隙，时隙太多导致多个低速ODUi(i<k)在装入OTUk时硬件实现的难度很大。在现在讨论的超100G信号格式OTUCn中(OTUCn相当于OTUk(k>4)，即超过100G速率的OTUk用OTUCn实现，n＝2，4，8，10等大于1的整数)，考虑到现有的硬件水平，OTUCn中的时隙粒度不是1.25G，而是10G，但这样会出现速率小于10G的ODUi装到OTUCn中时浪费空间的现象。
发明内容
本发明实施例提供了一种通过光通道传输单元信号发送、接收信号的方法及装置，以降低OPUk划分多个子空间的实现难度。
为了解决上述问题，本发明实施例提供了一种通过光通道传输单元信号发送信号的方法，包括：
将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中；一个低速ODUi信号或非OTN信号装到一个所述逻辑通道中；每个所述逻辑通道中最多装一个所述低速ODUi信号或非OTN信号；
将所述OPUk净荷加上OPUk开销、ODUk开销和OTUk开销组成OTUk帧；
发送所述OTUk帧组成的OTUk信号。
可选地，所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括所述逻辑通道的编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于每个逻辑通道；
将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中是指：将低速ODUi信号或非OTN信号装到位于OPUk净荷中的逻辑通道单元净荷中；
所述方法还包括：
将所述逻辑通道单元开销装到OPUk开销、ODUk开销和OPUk净荷中的一个或多个中。
可选地，一个所述逻辑通道单元占用一个OPUk帧，其中所述逻辑通道单元的逻辑通道单元净荷占用OPUk净荷，所述逻辑通道单元的逻辑通道单元开销占用OPUk开销、或ODUk开销、或OPUk净荷中的一部分。
可选地，一个所述逻辑通道单元占用一个OPUk帧的一部分，其中所述逻辑通道单元的逻辑通道单元净荷占用OPUk净荷的一部分；所述逻辑通道单元的逻辑通道单元开销占用OPUk开销、或ODUk开销、或OPUk净荷中的一部分。
可选地，一个所述逻辑通道单元占用一个OPUk帧的一部分是指：
一个所述逻辑通道单元中的逻辑通道单元净荷占用OPUk净荷中的一行，
所述逻辑通道单元的逻辑通道单元开销占用OPUk开销中的一行。
可选地，将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中后还包括：
在所述OPUk净荷中，计算所有用于装所述低速ODUi信号或非OTN信号的逻辑通道单元净荷的带宽之和X，如果X加上OPUk净荷中可能存在的逻辑通道单元开销所占用的带宽Y之和小于该OPUk净荷的带宽，则在该OPUk净荷的带宽中X、Y以外的带宽中填补特殊逻辑通道单元净荷。
可选地，将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中的步骤还包括：
计算接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，并将此时间长度T作为所述低速ODUi信号或非OTN信号装入逻辑通道时对应的逻辑通道的速率调整开销，放入所述逻辑通道单元开销中。
可选地，所述时间长度T通过基准时钟的个数计算，所述基准时钟指所述的OTUk信号时钟经过分频后得到的时钟。
本发明实施例还提供了一种通过光通道传输单元信号接收信号的方法，包括：
接收OTUk信号，获得OTUk帧；
将所述OTUk帧分解得到逻辑通道；
从所述逻辑通道中恢复出低速ODUi信号或非OTN信号。
可选地，所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括所述逻辑通道的编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于每个逻辑通道；
从所述逻辑通道中恢复出低速ODUi信号或非OTN信号包括：
从OPUk开销、ODUk开销和OPUk净荷中的一个或多个中获得逻辑通道单元开销；
根据所述逻辑通道单元开销，从位于OPUk净荷中的逻辑通道单元净荷中恢复出低速ODUi信号或非OTN信号。
可选地，所述的方法还包括：
从所述逻辑通道单元开销中提取出速率调整开销；
根据所述速率调整开销、基准时钟和逻辑通道单元净荷字节数，恢复出低速ODUi信号或非OTN信号的时钟；所述速率调整开销是指发送端接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，所述时间长度T通过所述基准时钟的个数计算；所述基准时钟指所述的OTUk信号时钟经过分频后得到的时钟。
本发明实施例还提供了一种通过光通道传输单元信号发送信号的装置，包括：
装载模块，设置为将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中；一个低速ODUi信号或非OTN信号装到一个所述逻辑通道中；每个所述逻辑通道中最多装一个所述低速ODUi信号或非OTN信号；
组帧模块，设置为将所述OPUk净荷加上OPUk开销、ODUk开销和OTUk开销组成OTUk帧；
发送模块，设置为发送所述OTUk帧组成的OTUk信号。
可选地，所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括所述逻辑通道的编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于每个逻辑通道；
所述装载模块将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中是指：所述装载模块将低速ODUi信号或非OTN信号装到位于OPUk净荷中的逻辑通道单元净荷中；
所述装载模块还设置为将所述逻辑通道单元开销装到OPUk开销、ODUk开销和OPUk净荷中的一个或多个中。
可选地，所述装载模块还设置为将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中后，计算所述OPUk净荷中，所有用于装所述低速ODUi信号或非OTN信号的逻辑通道单元净荷的带宽之和X；如果X加上OPUk净荷中可能存在的逻辑通道单元开销所占用的带宽Y之和小于该OPUk净荷的带宽，则在该OPUk净荷的带宽中X、Y以外的带宽中填补特殊逻辑通道单元净荷。
可选地，所述装载模块还设置为在将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中的过程中，计算接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，并将此时间长度T作为所述低速ODUi信号或非OTN信号装入逻辑通道时对应的逻辑通道的速率调整开销，放入所述逻辑通道单元开销中；所述时间长度T通过基准时钟的个数计算，所述基准时钟指所述的OTUk信号时钟经过分频后得的时钟。
本发明实施例还提供了一种通过光通道传输单元信号接收信号的装置，包括：
接收模块，设置为接收OTUk信号，获得OTUk帧；
分解模块，设置为将所述OTUk帧分解得到逻辑通道；
恢复模块，设置为从所述逻辑通道中恢复出低速ODUi信号或非OTN信号。
可选地，所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括所述逻辑通道的编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于每个逻辑通道；
所述恢复模块从所述逻辑通道中恢复出低速ODUi信号或非OTN信号是
指：
所述恢复模块从OPUk开销、ODUk开销和OPUk净荷中的一个或多个里获得逻辑通道单元开销；根据所述逻辑通道单元开销，从位于OPUk净荷中的逻辑通道单元净荷中恢复出低速ODUi信号或非OTN信号。
可选地，所述的装置还包括：
提取模块，设置为从所述逻辑通道单元开销中提取出速率调整开销；
所述恢复模块还设置为根据所述速率调整开销、基准时钟和逻辑通道单元净荷字节数，恢复出低速ODUi信号或非OTN信号的时钟；所述速率调整开销是指发送端接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，所述时间长度T通过所述基准时钟的个数计算；所述基准时钟指所述的OTUk信号时钟经过分频后得的时钟。
本发明实施例还提供一种计算机可读存储介质，所述存储介质存储有计算机程序，该计算机程序包括程序指令，当该程序指令被通过光通道传输单元信号发送信号的设备执行时，使得该设备可执行上述通过光通道传输单元信号发送信号的的方法。
本发明实施例还提供一种计算机可读存储介质，所述存储介质存储有计算机程序，该计算机程序包括程序指令，当该程序指令被通过光通道传输单元信号接收信号的设备执行时，使得该设备可执行上述通过光通道传输单元信号接收信号的方法。
本发明实施例涉及光传送网的一种全新的实现方式，本发明实施例对现有光传送网技术中非OTN信号(非OTN信号指除过OTUk和ODUk以外的信号)和ODUi(i<k)装到OPUk净荷中的方法进行了改进，经过本发明实施例所述的改进后，在大于等于100G速率的光传送网信号中可以用更低的硬件代价实现OPUk净荷划分，并能使得OPUk净荷划分所得的子空间的带宽为小于OPUk净荷带宽的任意值，从而能够使得多个ODUi能够更高效更简单的装到光传送网信号中，同时基本不改变现有的光传送网信号的信号结
构。
本发明实施例还提供了一种新的非OTN信号或低速ODUi信号(i<k)装到OPUk净荷中(注，装到OPUk净荷和装到OTUk的意思是一样的，因为OPUk净荷是OTUk中的一部分)的方法FMP(Frame based Mapping Procedure，基于帧的映射规程)，降低现在非OTN信号和ODUi信号装到OPUk中的映射和解映射的硬件实现难度。和现有的AMP和GMP相比，实现此方式所需的硬件代价更低，同时非OTUk或低速ODUi信号经过OTUk传输后再恢复出非OTUk或低速ODUi信号时的时钟恢复效果基本等同于GMP和AMP。
本发明实施例所提供的基于逻辑通道的OPUk净荷空间划分方案加上上述FMP映射，可以降低硬件实现难度，从而使得现有硬件条件下大于100G的OTN信号OTUCn信号也能支持1.25G粒度的空间划分，同时对于大于100G的OTN信号也可不用采用规划中的OTUCn帧结构，可以仍旧使用现有的OTUk帧结构。
使用本发明实施例基于逻辑通道划分OPUk净荷的方法，以及使用FMP映射实现非OTUk或低速ODUi装入到OPUk净荷的逻辑通道中，和现有光传送网标准中基于字节间插的时隙方式划分OPUk净荷空间，以及使用AMP、GMP映射实现非OTUk或低速ODUi装入到OPUk净荷或OPUk净荷中的时隙中的方式相比，本发明实施例所述方法包括如下优点：
(1)由于OPUk逻辑通道在高速OPUk中占用一个整帧或一个整帧中的一部分(例如1行)，这样在芯片内部处理OPUk净荷的逻辑通道时相当于一个时钟周期对应一个逻辑通道，即时分复用方式，不需要再做空分到时分再到空分的复杂转换，而现有标准下是多个时隙对应一个时钟周期，即空分复用方式，需要做空分到时分再到空分的复杂转换，导致硬件实现代价很高，并且直接导致大于100G的OTUk信号的时隙无法划分到小于10G的粒度，而本发明下的逻辑通道可以保证大于100G的OTUk信号的时隙小于或等于1.25G粒度，降低OPUk划分多个子空间的实现难度，保证大于100G的OTN信号可以用相当或更低的硬件代价实现更多的子空间划分。
(2)现有标准中按照字节间插方式给OTUk划分时隙的方式随着时隙
数量增大导致实现难度非常大，所以现有的大于100G的OTUk信号采用n个100G信号并行实现，即OTUCn方式，使用本发明后，对大于100G的OTUk信号可不用并行方式，仍旧可以使用现有的OTUk帧结构，只需提高OTUk信号的速率即可
(3)修改现在的基于时隙的OPUk净荷子空间划分方式，现在基于时隙的子空间划分方式得到的子空间为固定带宽，不支持柔性带宽；而本发明实施例使用逻辑通道划分OPUk净荷空间后得到的子空间的带宽为柔性带宽，即某个逻辑通道的带宽可以是不超过OPUk净荷带宽的任意值，而现有标准中按照时隙划分OPUk净荷得到的子空间为刚性带宽，即子空间带宽为时隙带宽的整数倍，例如当时隙为1.25G时，OPUk划分子空间所得的子空间带宽必须为1.25G的整数倍，这样在子空间内装入某些ODUi信号时由于ODUi的带宽比1.25G的整数倍稍微高一点，就可能存在将近一个时隙带宽的带宽浪费。柔性带宽可以进一步提高带宽利用率，理论上可以压榨出OPUk净荷中每一个bit的空间。
附图概述
图1是OTUk的帧结构示意图；
图2是现有光传送标准中OPUk净荷划分为4个时隙的示意图；
图3是本发明实施例的一种通过光通道传输单元信号发送信号的方法的流程示意图；
图4是本发明实施例的逻辑通道划分示意图。
本发明的较佳实施方式
下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，如果不冲突，本发明实施例以及实施例中的各个特征可以相互结合，均在本发明的保护范围之内。另外，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
本发明实施例提供了一种通过光通道传输单元信号发送信号的方法，如
图3所示，包括：
将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中；一个低速ODUi信号或非OTN信号装到一个所述逻辑通道中；每个所述逻辑通道中最多装一个所述低速ODUi信号或非OTN信号；
将所述OPUk净荷加上OPUk开销、ODUk开销和OTUk开销组成OTUk帧；
发送所述OTUk帧组成的OTUk信号。
该生成方法给出了一种新的光传送网中的子空间划分方案，其中光传送网信号也叫OTUk(k为整数，不同的k值表示不同的信号速率)信号，由OTUk帧组成，OTUk帧由OTUk开销、ODUk开销、OPUk开销和OPUk净荷组成，其中ODUk开销加OPUk开销加OPUk净荷组成ODUk帧，OPUk开销加OPUk净荷组成OPUk帧，OPUk净荷可以作为一个整体空间用来装一个非OTN信号，也可被划分为多个子空间分别用来装多个低速ODUi(i<k)信号，按照逻辑通道将OPUk净荷划分为一个或多个子空间，每个逻辑通道有一个逻辑通道编号，可按照逻辑通道编号识别不同的逻辑通道，每个逻辑通道的带宽可以是小于或等于OPUk净荷带宽的任意值，同时将某一个特殊逻辑通道作为速率填充通道；一个低速ODUi(i<k)信号或非OTN信号只能装到一个逻辑通道中，每个逻辑通道只能装一个低速ODUi(i<k)信号或非OTN信号。
所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括逻辑通道编号，可通过此逻辑通道编号识别不同的逻辑通道单元；所述逻辑通道单元开销位于OPUk开销或ODUk开销中或OPUk净荷中；所述逻辑通道单元净荷位于OPUk净荷中，OPUk净荷的所有内容都属于各个逻辑通道。逻辑通道单元净荷中的所有空间都用于装所述低速ODUi(i<k)信号或非OTN信号。
所述将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中是指：将低速ODUi信号或非OTN信号装到位于OPUk净荷中的逻辑通道单元净荷中；
所述方法还可以包括：
将所述逻辑通道单元开销装到OPUk开销、ODUk开销和OPUk净荷中的一个或多个里。
可选地，一个所述逻辑通道单元可以占用一个OPUk帧，其中逻辑通道单元净荷占用OPUk净荷，逻辑通道单元开销占用OPUk开销、或ODUk开销、或OPUk净荷中的一部分。
可选地，一个所述逻辑通道单元可以占用一个OPUk帧的一部分，其中逻辑通道单元净荷占用OPUk净荷的一部分；逻辑通道单元开销占用OPUk开销、或ODUk开销、或OPUk净荷中的一部分。
可选地，一个所述逻辑通道单元占用一个OPUk帧的一部分的一种可能情况是：一个所述逻辑通道单元中的逻辑通道单元净荷占用OPUk净荷中的一行，相应地，该逻辑通道单元中的逻辑通道单元开销占用OPUk开销中的一行。实际应用时还存在其它各种可能的实现方式。
所述的特殊逻辑通道的作用为实现速率填充。所述将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中后还可以包括：在一个OPUk净荷中，所有用于装所述的低速ODUi(i<k)信号或非OTN信号的逻辑通道单元净荷的带宽之和X，加上OPUk净荷中可能存在的逻辑通道单元开销所占用的带宽Y的和(即X+Y)，如果X+Y小于该OPUk净荷的带宽，则该OPUk净荷的带宽中X、Y以外的带宽由特殊逻辑通道单元净荷填补；即：所述特殊逻辑通道单元净荷的带宽和所有用于装所述的低速ODUi(i<k)信号或非OTN信号的逻辑通道单元净荷的带宽之和，是OPUk净荷的带宽和可能存在的逻辑通道单元开销所占用的带宽的带宽差。
经过以上处理后，所有用于装所述低速ODUi信号或非OTN信号的逻辑通道单元净荷的带宽之和，加上特殊逻辑通道单元净荷的带宽，加上OPUk净荷中可能包含的所有逻辑通道单元开销所占用的带宽，正好等于OPUk净荷所占用的带宽。
在一种可能的情况中，逻辑通道单元开销不位于OPUk净荷中，此时OPUk净荷中可能包含的所有逻辑通道单元开销所占用的带宽为0。
所述在将所述的低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中的步骤还可以包括：计算接收到字节数量为所述逻辑通道单元净荷字节数的上述低速ODUi(i<k)信号或非OTN信号所用的时间长度T，并将此时间长度T作为上述低速ODUi(i<k)信号或非OTN信号装入逻辑通道时对应的逻辑通道的速率调整开销，放入所述逻辑通道单元开销中。
可选地，所述时间长度T通过测量基准时钟的个数计算，所述基准时钟指所述的OTUk信号时钟经过分频后得的时钟。
下面对本发明的原理进行简单分析：
现有的OTUk帧中的OPUk净荷中，为了能装多个低速ODUi(i<k)，采用将OPUi划分为n个时隙的方式，时隙使用字节间插的方式实现，在OPUk速率较低且时隙数量较少时硬件实现所需的代价不大，但当OPUk速率较高时，例如OPU4速率为100Gbps左右，此时按照1.25G颗粒划分时隙需要划分为80个时隙，而且也是以字节间插的方式实现时隙划分，即从OPUk净荷的第一个字节开始，连续80个字节分别作为80个时隙，后续的连续80个字节仍旧作为80个时隙，也就是说对于某个时隙的连续两个字节在OPUk净荷中间隔80个字节，在芯片内部实现OPUk净荷中的时隙处理时，由于芯片内部的最高时钟速率一般只有700MHz左右，这样100G的OPU4净荷实际是一个700MHz左右的时钟加20字节左右宽的数据信号组成，这样一个时钟周期就会同时出现20个时隙的数据，这在芯片处理上相当于空分复用，即要处理的不同内容在一个时钟周期内的不同信号线上，这会导致芯片处理时隙的难度增大。
本发明实施例能够做到一个时钟周期内的20字节宽度的数据全部属于一个逻辑通道，因此对于逻辑通道的处理就可以用一套硬件分时处理实现，这样相当于时分复用，将大大简化硬件的实现难度。实际上在处理OPU4净荷时，大部分芯片都先需要将一个时钟周期内的不同时隙转换为一个时钟对应一个时隙，也就是空分转时分，在时分情况下处理完成后再转为空分最终形成OPUk净荷，如果OPUk净荷的时隙划分本来就是能够以时分的方式实现，则以上时分和空分的互相转换就可以去掉，从而节省芯片内部大量的处理资源。本发明实施例使用逻辑通道实现OPUk空间划分的方法就能够使得
OPUk净荷处理时直接对应时分处理，不再需要复杂的时分和空分相互转换。
本发明实施例中，在OPUk帧中引入了逻辑通道的概念，即通过逻辑通道将一个OPUk净荷对应的传送带宽分为n个子带宽(也就是将OPUk净荷划分为多个子空间)，每个子带宽的实际带宽可以是小于OPUk净荷带宽的任意值，并且所有n个子带宽的带宽和小于等于OPUk净荷带宽。逻辑通道用来装低速ODUi或非OTN信号，一个逻辑通道必须只能装一个低速ODUi或一个非OTN信号，不允许一个逻辑通道装多个低速ODUi或多个非OTN信号，即逻辑通道和被装入的信号是一一对应的。本发明中的逻辑通道的作用就等同于现有光传送标准中定义的OPUk净荷的时隙，但本发明实施例的逻辑通道对应的带宽是灵活可变的，可为小于OPUk净荷带宽的任意值，而现有标准中的时隙的带宽是固定值。
本发明实施例中，逻辑通道通过逻辑通道编号识别，装入非OTN信号或者低速ODUi信号的逻辑通道的逻辑通道编号的值为大于1小于M的整数，M为某个固定值，可根据OPUk净荷带宽和期望逻辑通道带宽的最小值来决定。逻辑通道编号为0的逻辑通道为特殊逻辑通道，专门用来实现速率填充，本发明实施例中将逻辑通道编号为0的逻辑通道命名为IDLE通道，其功能类似于以太网MAC帧中的IDLE帧。
本发明实施例中，逻辑通道由多个逻辑通道单元组成，每个逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成，逻辑通道单元净荷用来装需要装到OPUk净荷中的非OTN信号或ODUi(i<k)信号，位于在OPUk净荷中；逻辑通道单元开销用来维护管理逻辑通道，其内容至少包括逻辑通道编号和速率调整开销，其中速率调整开销由FMP映射产生，逻辑通道编号用来识别不同的逻辑通道，逻辑通道单元开销位于OPUk或ODUk开销或OPUk净荷中。OPUk净荷的所有带宽全部被各逻辑通道的逻辑通道单元净荷和可能存在于OPUk净荷中的逻辑通道单元开销占满，即OPUk净荷的所有字节都属于某一个逻辑通道的逻辑通道单元净荷或属于某个逻辑通道单元开销。组成某一个逻辑通道的多个逻辑通道单元净荷在OPUk净荷中不一定紧挨着。
下面举例说明逻辑通道单元和OPUk帧及ODUk帧的对应关系。
例如，可以规定一个逻辑通道单元由一个OPUk帧组成，即一个逻辑通
道单元的逻辑通道单元净荷对应一个OPUk帧中的OPUk净荷，逻辑通道单元开销对应该OPUk帧中的部分OPUk开销，OPUk开销中的个别字节需要留给逻辑通道单元开销使用。OPUk帧是连续发送的，每个OPUk帧对应一个逻辑通道单元，每个逻辑通道单元靠逻辑通道编号识别，例如图4中，连续三帧的OTUk帧的复帧定位信号MFAS值分别对应0，1，2(MFAS是ODUk和OTUk共用的开销，每发一帧MFAS值加1)，由于一个OPUk帧对应一个逻辑通道单元，MFAS＝0,1,2时分别对应逻辑通道2，7，5的逻辑通道单元，此时这三帧中的OPUk净荷的所有字节也分别属于逻辑通道2，7，5的逻辑通道单元净荷。
在本发明实施例中，某个OPUk帧属于哪个逻辑通道采用按需分配的方式，即当有m个ODUi(i<k)需要装入OPUk净荷时，先给每个ODUi分配一个逻辑通道编号，不同的ODUi必须分配不同的逻辑通道编号，逻辑通道号将成为在OPUk净荷中识别这些ODUi的标识，产生OTUk帧的芯片首先要接收这m个ODUi，并不断检查每个ODUi接收的字节数是否达到了15232个(15232＝4*3808，也就是OPUk净荷中的字节数)，如果某个ODUi接收字节数达到了15232，则看当前OPUk帧是否空闲，如果空闲则将接收到的此ODUi的15232字节装入到当前OPUk帧中的15232字节中，如果当前OPUk帧正在装别的ODUi则等待直到OPUk帧有空闲为止，这样只要OPUk净荷的带宽大于m个ODUi的带宽，则m个ODUi最终总能以合适的方式装入OPUk净荷中，如果某个OPUk帧空闲且实在没有某个ODUi在等待装到OPUk净荷中，则将此OPUk帧的逻辑通道编号设置为0，此OPUk帧对应IDLE通道。
上述OPUk净荷中，逻辑通道单元由一个OPUk帧组成，则当需要将n个ODUi映射到OPUk时，由于每个ODUi必须缓冲一个逻辑通道单元净荷的4*3808字节后才能装入OPUk帧中，这样可能需要至少n个4*3808字节的缓冲区，当n很大时这个缓冲区很大，从而导致硬件实现代价因为缓冲区太大而增大，进而导致处理ODUi的延迟增大。为了减少所需的缓冲区，本发明提供另外一个实施例，即逻辑通道单元由OPUk帧中的一部分组成，例如将OPUk帧中的一行作为逻辑通道单元，即每个逻辑通道单元净荷占用
OPUk帧净荷中1行的内容(3808字节)，逻辑通道单元开销占用OPUk开销中1行的内容(2字节)。另一种实施例是OTUk帧不再保持现在标准规定的4行4080列，而是改为一帧由M行N列组成，逻辑通道单元由一个OPUk帧或OPUk帧中的一部分组成。在特殊情况下，逻辑通道单元开销中的一部分也可能位于OPUk净荷中的某个位置。
本发明实施例中，非OTN信号或者低速ODUi信号装入OPUk净荷中的逻辑通道后还必须保存其时钟频率信息，以便在从OPUk净荷的逻辑通道中恢复出此非OTUk或ODUi信号时能够同时恢复出其时钟频率从而保证其时钟透传。在现有标准中，AMP和GMP都可以通过速率调整开销记录其时钟频率信息，本发明实施例也必须提供类似的手段，为此本发明实施例提出了FMP映射，此技术就是为了能够保证非OTUk和低速ODUi在经过OTUk传输后的频率透传性。在本发明实施例所述的FMP映射中，在将非OTUk或低速ODUi装入OPUk净荷时，首先需要将OTUk的时钟做Fm分频后作为基准时钟，其中Fm为一个整数，根据OTUk时钟的频率，Fm的取值一般保证OTUk时钟频率/Fm以后的值为100MHz-2GHz(这个频率范围的具体值由硬件处理能力决定)，例如对于OTU4，Fm值可以取80，OTU4的准确时钟频率为111809973.568kbit/s，也就是约111.8GHz，111.8GHz/80＝1.3975GHz，可将此时钟作为基准时钟，针对非OTUk或低速ODUi信号，统计接收B字节(B为逻辑通道单位净荷字节数，当一个OPUk帧作为逻辑通道单位时，B为OPUk净荷字节数，即4*3808＝15232字节)的以上信号(非OTN信号或者低速ODUi信号)所需的基准时钟的个数Cm，然后将接收到的B字节的以上信号放入一个空闲的OPUk帧中对应的逻辑通道单元净荷中，将Cm值放入OPUk开销或ODUk开销或OPUk净荷中的逻辑通道单元开销中；当从OTUk中恢复出以上非OTN信号或低速ODUi信号时，使用OTUk的时钟、Fm、B和Cm值即可恢复出此非OTN信号或低速ODUi信号的时钟，而且时钟恢复效果基本等同于GMP和AMP映射。
本发明实施例还提供了一种通过光通道传输单元信号接收信号的方法，包括：
接收OTUk信号，获得OTUk帧；
将所述OTUk帧分解得到逻辑通道；
从所述逻辑通道中恢复出低速ODUi信号或非OTN信号。
其中，所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括逻辑通道编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于各个逻辑通道；
从所述逻辑通道中恢复出低速ODUi信号或非OTN信号包括：
从OPUk开销、ODUk开销和OPUk净荷中的一个或多个中获得逻辑通道单元开销；
根据所述逻辑通道单元开销，从位于OPUk净荷中的逻辑通道单元净荷中恢复出低速ODUi信号或非OTN信号。
所述的方法还可以包括：
从所述逻辑通道单元开销中提取出速率调整开销；
根据所述速率调整开销、基准时钟和逻辑通道单元净荷字节数，恢复出低速ODUi信号或非OTN信号的时钟；所述速率调整开销是指发送端接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，所述时间长度T通过所述基准时钟的个数计算；所述基准时钟指所述的OTUk信号时钟经过分频后得的时钟。
相应地，本发明实施例还一种通过光通道传输单元信号发送信号的装置，包括处理器和程序存储设备、数据存储设备，还包括：
装载模块，适用于将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中；一个低速ODUi信号或非OTN信号装到一个所述逻辑通道中；每个所述逻辑通道中最多装一个所述低速ODUi信号或非OTN信号；
组帧模块，适用于将所述OPUk净荷加上OPUk开销、ODUk开销和OTUk开销组成OTUk帧；
发送模块，适用于发送所述OTUk帧组成的OTUk信号。
其中，所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括逻辑通道编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于各个逻辑通道；
所述装载模块将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中是指：所述装载模块将低速ODUi信号或非OTN信号装到位于OPUk净荷中的逻辑通道单元净荷中；
所述装载模块还可以适用于将所述逻辑通道单元开销装到OPUk开销、ODUk开销和OPUk净荷中的一个或多个中。
其中，所述装载模块还可以适用于将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中后，计算所述OPUk净荷中，所有用于装所述低速ODUi信号或非OTN信号的逻辑通道单元净荷的带宽之和X；X加上OPUk净荷中可能存在的逻辑通道单元开销所占用的带宽Y如果小于该OPUk净荷的带宽，则在该OPUk净荷的带宽中X、Y以外的带宽中填补特殊逻辑通道单元净荷。
其中，所述装载模块还可以适用于在将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中的过程中，计算接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，并将此时间长度T作为所述低速ODUi信号或非OTN信号装入逻辑通道时对应的逻辑通道的速率调整开销，放入所述逻辑通道单元开销中；所述时间长度T通过基准时钟的个数计算，所述基准时钟指所述的OTUk信号时钟经过分频后得的时钟。
相应地，本发明实施例还一种通过光通道传输单元信号接收信号的装置，包括处理器、程序存储设备和数据存储设备，还包括：
接收模块，适用于接收OTUk信号，获得OTUk帧；
分解模块，适用于将所述OTUk帧分解得到逻辑通道；
恢复模块，适用于从所述逻辑通道中恢复出低速ODUi信号或非OTN信号。
其中，所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括逻辑通道编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于各个逻辑通道；
所述恢复模块从所述逻辑通道中恢复出低速ODUi信号或非OTN信号是指：
所述恢复模块从OPUk开销、ODUk开销和OPUk净荷中的一个或多个中获得逻辑通道单元开销；根据所述逻辑通道单元开销，从位于OPUk净荷中的逻辑通道单元净荷中恢复出低速ODUi信号或非OTN信号。
所述装置还可以包括提取模块，适用于从所述逻辑通道单元开销中提取出速率调整开销；
所述恢复模块还可以适用于根据所述速率调整开销、基准时钟和逻辑通道单元净荷字节数，恢复出低速ODUi信号或非OTN信号的时钟；所述速率调整开销是指发送端接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，所述时间长度T通过所述基准时钟的个数计算；所述基准时钟指所述的OTUk信号时钟经过分频后得的时钟。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本发明不限制于任何特定形式的硬件和软件的结合。
当然，本发明还可有其他多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明的权利要求的保护范围。
本发明实施例提供的技术方案，通过将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中，每个逻辑通道中最多装一个低速ODUi信号或非OTN信号，并将OPUk净荷加上OPUk开销、ODUk开销和OTUk开销组成OTUk帧，然后进行发送，能够降低OPUk划分多个子空间的实现难度。
Claims (20)
- 一种通过光通道传输单元信号OTUk发送信号的方法，包括：将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中；一个低速ODUi信号或非OTN信号装到一个所述逻辑通道中；每个所述逻辑通道中最多装一个所述低速ODUi信号或非OTN信号；将所述OPUk净荷加上OPUk开销、ODUk开销和OTUk开销组成OTUk帧；发送所述OTUk帧组成的OTUk信号。
- 如权利要求1所述的方法，其中：所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括所述逻辑通道的编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于每个逻辑通道；将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中是指：将低速ODUi信号或非OTN信号装到位于OPUk净荷中的逻辑通道单元净荷中；所述方法还包括：将所述逻辑通道单元开销装到OPUk开销、ODUk开销和OPUk净荷的一个或多个中。
- 如权利要求2所述的方法，其中：一个所述逻辑通道单元占用一个OPUk帧，其中所述逻辑通道单元的逻辑通道单元净荷占用OPUk净荷，所述逻辑通道单元的逻辑通道单元开销占用OPUk开销、或ODUk开销、或OPUk净荷中的一部分。
- 如权利要求2所述的方法，其中：一个所述逻辑通道单元占用一个OPUk帧的一部分，其中所述逻辑通道单元的逻辑通道单元净荷占用OPUk净荷的一部分，所述逻辑通道单元的逻 辑通道单元开销占用OPUk开销、或ODUk开销、或OPUk净荷中的一部分。
- 如权利要求4所述的方法，其中，所述一个所述逻辑通道单元占用一个OPUk帧的一部分是指：一个所述逻辑通道单元中的逻辑通道单元净荷占用OPUk净荷中的一行，所述逻辑通道单元的逻辑通道单元开销占用OPUk开销中的一行。
- 如权利要求2所述的方法，其中，将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中后还包括：在所述OPUk净荷中，计算所有用于装所述低速ODUi信号或非OTN信号的逻辑通道单元净荷的带宽之和X，如果X加上OPUk净荷中可能存在的逻辑通道单元开销所占用的带宽Y之和小于该OPUk净荷的带宽，则在该OPUk净荷的带宽中X、Y以外的带宽中填补特殊逻辑通道单元净荷。
- 如权利要求2所述的方法，其中，所述将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中的步骤还包括：计算接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，并将此时间长度T作为所述低速ODUi信号或非OTN信号装入逻辑通道时对应的逻辑通道的速率调整开销，放入所述逻辑通道单元开销中。
- 如权利要求7所述的方法，其中：所述时间长度T通过基准时钟的个数计算，所述基准时钟指所述的OTUk信号时钟经过分频后得到的时钟。
- 一种通过光通道传输单元信号接收信号的方法，包括：接收OTUk信号，获得OTUk帧；将所述OTUk帧分解得到逻辑通道；从所述逻辑通道中恢复出低速ODUi信号或非OTN信号。
- 如权利要求9所述的方法，其中：所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括所述逻辑通道的编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于每个逻辑通道；从所述逻辑通道中恢复出低速ODUi信号或非OTN信号包括：从OPUk开销、ODUk开销和OPUk净荷中的一个或多个中获得逻辑通道单元开销；根据所述逻辑通道单元开销，从位于OPUk净荷中的逻辑通道单元净荷中恢复出低速ODUi信号或非OTN信号。
- 如权利要求10所述的方法，还包括：从所述逻辑通道单元开销中提取出速率调整开销；根据所述速率调整开销、基准时钟和逻辑通道单元净荷字节数，恢复出低速ODUi信号或非OTN信号的时钟；所述速率调整开销是指发送端接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，所述时间长度T通过所述基准时钟的个数计算；所述基准时钟指所述的OTUk信号时钟经过分频后得到的时钟。
- 一种通过光通道传输单元信号发送信号的装置，包括：装载模块，设置为将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中；一个低速ODUi信号或非OTN信号装到一个所述逻辑通道中；每个所述逻辑通道中最多装一个所述低速ODUi信号或非OTN信号；组帧模块，设置为将所述OPUk净荷加上OPUk开销、ODUk开销和OTUk开销组成OTUk帧；发送模块，设置为发送所述OTUk帧组成的OTUk信号。
- 如权利要求12所述的装置，其中：所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括所述逻辑通道的编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi 信号或非OTN信号；所述OPUk净荷的所有内容都属于每个逻辑通道；所述装载模块将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中是指：所述装载模块将低速ODUi信号或非OTN信号装到位于OPUk净荷中的逻辑通道单元净荷中；所述装载模块还设置为将所述逻辑通道单元开销装到OPUk开销、ODUk开销和OPUk净荷中的一个或多个中。
- 如权利要求13所述的装置，其中：所述装载模块还设置为将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中后，计算所述OPUk净荷中，所有用于装所述低速ODUi信号或非OTN信号的逻辑通道单元净荷的带宽之和X；如果X加上OPUk净荷中可能存在的逻辑通道单元开销所占用的带宽Y之和小于该OPUk净荷的带宽，则在该OPUk净荷的带宽中X、Y以外的带宽中填补特殊逻辑通道单元净荷。
- 如权利要求13所述的装置，其中：所述装载模块还设置为在将低速ODUi信号或非OTN信号装到OPUk净荷中的逻辑通道中的过程中，计算接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，并将此时间长度T作为所述低速ODUi信号或非OTN信号装入逻辑通道时对应的逻辑通道的速率调整开销，放入所述逻辑通道单元开销中；所述时间长度T通过基准时钟的个数计算，所述基准时钟指所述的OTUk信号时钟经过分频后得的时钟。
- 一种通过光通道传输单元信号接收信号的装置，包括：接收模块，设置为接收OTUk信号，获得OTUk帧；分解模块，设置为将所述OTUk帧分解得到逻辑通道；恢复模块，设置为从所述逻辑通道中恢复出低速ODUi信号或非OTN信号。
- 如权利要求16所述的装置，其中：所述逻辑通道由逻辑通道单元组成，所述逻辑通道单元由逻辑通道单元净荷和逻辑通道单元开销组成；所述逻辑通道单元开销中至少包括所述逻辑通道的编号；所述逻辑通道单元净荷中的所有空间都用于装所述低速ODUi信号或非OTN信号；所述OPUk净荷的所有内容都属于每个逻辑通道；所述恢复模块从所述逻辑通道中恢复出低速ODUi信号或非OTN信号是指：所述恢复模块从OPUk开销、ODUk开销和OPUk净荷中的一个或多个里获得逻辑通道单元开销；根据所述逻辑通道单元开销，从位于OPUk净荷中的逻辑通道单元净荷中恢复出低速ODUi信号或非OTN信号。
- 如权利要求17所述的装置，还包括：提取模块，设置为从所述逻辑通道单元开销中提取出速率调整开销；所述恢复模块还设置为根据所述速率调整开销、基准时钟和逻辑通道单元净荷字节数，恢复出低速ODUi信号或非OTN信号的时钟；所述速率调整开销是指发送端接收到字节数量为所述逻辑通道单元净荷字节数的所述低速ODUi信号或非OTN信号所用的时间长度T，所述时间长度T通过所述基准时钟的个数计算；所述基准时钟指所述的OTUk信号时钟经过分频后得的时钟。
- 一种计算机可读存储介质，所述存储介质存储有计算机程序，该计算机程序包括程序指令，当该程序指令被通过光通道传输单元信号发送信号的设备执行时，使得该设备可执行权利要求1-8任一项的方法。
- 一种计算机可读存储介质，所述存储介质存储有计算机程序，该计算机程序包括程序指令，当该程序指令被通过光通道传输单元信号接收信号的设备执行时，使得该设备可执行权利要求9-11任一项的方法。
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| CN114915375A (zh) * | 2022-04-27 | 2022-08-16 | 烽火通信科技股份有限公司 | 一种业务映射的实现方法和装置 |
| WO2023124341A1 (zh) * | 2021-12-31 | 2023-07-06 | 中兴通讯股份有限公司 | 信号速率处理方法、装置及存储介质 |
| WO2023134508A1 (zh) * | 2022-01-14 | 2023-07-20 | 华为技术有限公司 | 一种光传送网中的业务处理的方法、装置和系统 |
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| CN109962802A (zh) * | 2017-12-26 | 2019-07-02 | 中兴通讯股份有限公司 | 带宽调整方法、装置、系统、传送平面节点及存储介质 |
| CN110830426B (zh) * | 2018-08-13 | 2022-04-08 | 中兴通讯股份有限公司 | 映射开销传送/接收方法、装置、otn设备及存储介质 |
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| JP5644598B2 (ja) * | 2011-03-11 | 2014-12-24 | 富士通株式会社 | 信号多重分離装置及び信号多重収容装置及び信号多重収容・分離装置 |
| WO2012106946A1 (zh) * | 2011-08-16 | 2012-08-16 | 华为技术有限公司 | 一种可变速率信号的处理方法、装置及系统 |
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| CN101247200A (zh) * | 2007-02-15 | 2008-08-20 | 华为技术有限公司 | 一种otu信号的复用/解复用系统及方法 |
| CN101841741A (zh) * | 2009-03-16 | 2010-09-22 | 华为技术有限公司 | 光通道传送单元信号的传输方法和装置 |
| WO2013003612A1 (en) * | 2011-06-30 | 2013-01-03 | Exar Corporation | EFFICIENT METHOD TO EXTRACT A LOWER ORDER (LO) OPTICAL CHANNEL DATA UNIT (ODU)j SIGNAL FROM HIGHER ORDER (HO) OPTICAL CHANNEL TRANSPORT UNIT (OTU)k SIGNAL |
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| CN114915375B (zh) * | 2022-04-27 | 2023-06-09 | 烽火通信科技股份有限公司 | 一种业务映射的实现方法和装置 |
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