CN111884775A - HARQ transmission device and method based on shared cache - Google Patents
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H04L1/0061—Error detection codes
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Abstract
The invention discloses a HARQ transmission device and method based on shared cache, the method comprises the following steps: s1, the scheduling module schedules a retransmission or a new transmission according to the current feedback information and the buffer of the service data waiting to be sent; s2, the sending module sends data according to the instruction of the scheduling module; s3, the demodulation module decodes the received sending data and buffers the soft bit into the soft bit buffer module; s4, the soft bit buffer module sends the new transmission and retransmission soft bit received in the HARQ Process to the decoding module for decoding; s5, the decoding module informs the feedback module of the decoding result, if the decoding module succeeds in decoding, the soft bit cache module is informed to clear all cache bits of the corresponding HARQ Process, and the soft bit cache module informs the feedback module of the current cache state information; and S6, the feedback module constructs feedback information according to the input of the decoding module and the soft bit buffer module and feeds the feedback information back to the scheduling module. The method can effectively save hardware cost, match different service data models and adapt to different non-ideal retransmission time delays.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a HARQ transmission device and method based on shared cache.
Background
Distributed wireless communication systems are a major trend and trend in the development of wireless communication technology today. Especially in 5G communication system, in order to save hardware cost and increase software flexibility, a distributed scheme with different cuts is adopted. The BBU of the 5G access network is reconfigured into three functional entities, CU (Centralized Unit), DU (distributed Unit), RU (Remote/Radio Unit), and so on. In the current mainstream segmentation scheme option7.2, the CU device processes the functions of the radio higher layer protocol stack, such as the RRC layer, the PDCP layer, and the like, and even can support part of the core network functions to sink to the access network, thereby meeting the higher requirements of the future communication network on emerging services, such as video, network shopping, and virtual/augmented reality, for network delay. The DU device mainly handles part of the physical layer functions and layer 2 functions with high real-time requirements, such as a scheduler, etc., and the RU includes a radio frequency module and part of the physical layer functions.
Between DU and RU, a connection is made via FH (FrountHaul, fronthaul). Different FH schemes cause different delays between the DU and the RU. In some cases, these unstable and possibly significant delays can have a significant impact on the scheduler located in the DU, especially making HARQ (Hybrid Automatic repeat request) more challenging. After the HARQ technology is adopted, if a certain transmission fails, the receiving side needs to buffer the soft bit information sent this time, wait for the next retransmission of the same data, combine the same with the received retransmission data, and decode again. Since the time delay from the scheduler to the RU is large in the non-ideal FH, a long time is required to wait between the new transmission and the retransmission of the data, so that a large amount of memory is required by the receiving side to buffer the received data bits. If the receiving end is a terminal device and a chip design is adopted, the memory capacity of the receiving end is limited by the cost, the area and the power consumption of the chip and cannot be infinitely increased.
At present, the HARQ policy in 4G and 5G is to divide the memory into different HARQ processes with the same size. And each time data transmission occupies an idle HARQ Process, when the decoding of a receiving end fails, storing the soft bits waiting for combination in a buffer corresponding to the HARQ Process, and combining the soft bits when retransmission comes until the decoding is successful or the HARQ is overtime.
Although this is simple and the signaling overhead is small, for the distributed system, when the delay over FH is increased, the requirement for the number of HARQ processes increases sharply, and especially for the 5G high frequency system with a short transmission interval, the transmission time interval is 0.125ms at the subcarrier interval of 120KHz, at this time, the delay of 3ms corresponds to 24 transmission intervals, and for one FDD system, 24 HARQ processes need to be added.
Since the buffer of each HARQ Process needs to be reserved according to the size of the maximum possible transmission data block, when a large amount of HARQ processes are needed, the efficiency of uniformly dividing the buffers according to different HARQ processes is very low. Especially when the user has continuous packet transmission, the division method will bring a lot of waste of buffer memory. This causes a drastic increase in chip cost and design complexity on the terminal side.
Disclosure of Invention
The invention provides a device and a method for carrying out HARQ transmission by utilizing a shared cache technology among HARQ processes to solve the technical problems, which can effectively save hardware cost, match different service data models and adapt to different non-ideal retransmission time delays.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a HARQ transmission device based on shared buffer comprises a receiving module and a transmitting module,
the receiving module comprises a demodulation module, a decoding module, a soft bit buffer module and a feedback module,
a demodulation module for demodulating the received signal into soft bit information and outputting it to a decoding module;
a decoding module, configured to perform decoding processing on all soft bit information of the currently received HARQ Process, including newly transmitted soft bits and soft bits received in each retransmission and combined, and output an indication of decoding success or failure, where if the decoding success indicates that the soft bit cache module releases all soft bits corresponding to the HARQ Process, and after decoding, output a decoding result to the feedback module;
a soft bit buffer module: the device is used for caching the received soft bit information at the current sending time according to the number of the HARQ Process sent at this time, all the HARQ processes share all the storage space, when the transmission is retransmission, repeated bits are merged and updated, the bits transmitted for the first time are stored, when a decoding module needs to decode a certain HARQ Process, all the soft bits corresponding to the HARQ Process are output to the decoding module for decoding, and meanwhile, the current cache occupation condition is output to the feedback module.
The feedback module is used for feeding back the decoding result and the residual available buffer bit number to the sending module according to the currently received decoding result of the decoding module and the occupation condition of the buffer;
the sending module comprises a sending module and a scheduling module,
the sending module is used for sending signals according to the HARQ information scheduled by the scheduling module;
the scheduling module is used for performing HARQ scheduling according to the received feedback information, when the decoding result of a certain HARQ Process is information of a successful state, calculating the idle available bit number Q of a receiving module cache, the bit size B of a data cache to be sent in the sending module and the bit number C of an air interface which can be borne in the sending interval, taking the minimum value in Q, B, C as N, and scheduling a newly-transmitted HARQ Process containing N information bits; when receiving the information that the decoding result of a certain HARQ Process is in an unsuccessful state, calculating the number Q of idle available bits and the number P of check bits meeting the requirement of a target bit error rate cached by a receiving module, taking the number C of bits which can be carried by an air interface in the sending interval as N, and scheduling the retransmission HARQ Process containing N check bits, wherein the minimum value in Q, P, C is N.
A transmission method based on the transmission device comprises the following steps:
s1, the scheduling module schedules a retransmission or a new transmission according to the current feedback information and the buffer of the service data waiting to be sent;
s2, the sending module sends data according to the instruction of the scheduling module;
s3, the demodulation module decodes the received sending data and buffers the soft bit into the soft bit buffer module;
s4, the soft bit buffer module sends the new transmission and retransmission soft bit received in the HARQ Process to the decoding module for decoding;
s5, the decoding module informs the feedback module of the decoding result, if the decoding module succeeds in decoding, the soft bit cache module is informed to clear all cache bits of the corresponding HARQ Process, and the soft bit cache module informs the feedback module of the current cache state information;
and S6, the feedback module constructs feedback information according to the input of the decoding module and the soft bit buffer module and feeds the feedback information back to the scheduling module.
Further technical solution is that step S1 specifically includes the following steps: when receiving the information that the decoding result of a certain HARQ Process is in a successful state, calculating the number Q of idle available bits of a receiving module cache, the bit size B of a data cache waiting to be sent in a sending module and the bit number C of an air interface capable of bearing in the sending interval, taking the minimum value in Q, B, C as N, and scheduling a newly-transmitted HARQ Process containing N information bits; when receiving the information that the decoding result of a certain HARQ Process is in an unsuccessful state, calculating the number Q of idle available bits and the number P of check bits meeting the requirement of a target bit error rate cached by a receiving module, taking the number C of bits which can be carried by an air interface in the sending interval as N, and scheduling the retransmission HARQ Process containing N check bits, wherein the minimum value in Q, P, C is N.
Compared with the prior art, the invention has the following beneficial effects: the method can effectively save hardware cost, match different service data models and adapt to different non-ideal retransmission time delays.
Drawings
Fig. 1 is a schematic diagram of a distributed 5G base station;
fig. 2 is a schematic diagram of a shared buffer based HARQ transmission apparatus according to the present invention;
FIG. 3 is a flow chart of the processing between the modules of the present invention;
FIG. 4 is a process flow diagram of a scheduling module.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a distributed 5G base station, which is composed of 1 central unit, 4 extension units and 32 remote units. 4 expansion units are connected to the central unit, while 8 remote units are connected to each expansion unit. All remote units are configured as 1 cell. The forward transmission uses a passive optical network PON network, and generally, the delay of the forward transmission is 1.5ms to 2 ms.
Referring to fig. 2, fig. 2 is a schematic diagram of a shared buffer based HARQ transmission apparatus according to the present invention, which includes a receiving module and a transmitting module,
the receiving module comprises a demodulation module, a decoding module, a soft bit buffer module and a feedback module,
a demodulation module for demodulating the received signal into soft bit information and outputting it to a decoding module;
a decoding module, configured to perform decoding processing on all soft bit information of the currently received HARQ Process, including newly transmitted soft bits and soft bits received in each retransmission and combined, and output an indication of decoding success or failure, where if the decoding success indicates that the soft bit cache module releases all soft bits corresponding to the HARQ Process, and after decoding, output a decoding result to the feedback module;
a soft bit buffer module: the device is used for caching the received soft bit information at the current sending time according to the number of the HARQ Process sent at this time, all the HARQ processes share all the storage space, when the transmission is retransmission, repeated bits are merged and updated, the bits transmitted for the first time are stored, when a decoding module needs to decode a certain HARQ Process, all the soft bits corresponding to the HARQ Process are output to the decoding module for decoding, and meanwhile, the current cache occupation condition is output to the feedback module.
The feedback module is used for feeding back the decoding result and the residual available buffer bit number to the sending module according to the currently received decoding result of the decoding module and the occupation condition of the buffer;
the sending module comprises a sending module and a scheduling module,
the sending module is used for sending signals according to the HARQ information scheduled by the scheduling module;
the scheduling module is used for performing HARQ scheduling according to the received feedback information, when the decoding result of a certain HARQ Process is information of a successful state, calculating the idle available bit number Q of a receiving module cache, the bit size B of a data cache to be sent in the sending module and the bit number C of an air interface which can be borne in the sending interval, taking the minimum value in Q, B, C as N, and scheduling a newly-transmitted HARQ Process containing N information bits; when receiving the information that the decoding result of a certain HARQ Process is in an unsuccessful state, calculating the number Q of idle available bits and the number P of check bits meeting the requirement of a target bit error rate cached by a receiving module, taking the number C of bits which can be carried by an air interface in the sending interval as N, and scheduling the retransmission HARQ Process containing N check bits, wherein the minimum value in Q, P, C is N.
The transmitting module may use a waveform that can transmit OFDM (orthogonal frequency division multiplexing), employing LDPC (low density check code) coding and phase amplitude quadrature modulation.
The demodulation module is a reception module having the capability of receiving an OFDM (orthogonal frequency division multiplexing) waveform and deciding a phase amplitude quadrature modulated signal as soft bits.
The soft bit buffer module can be a memory management system on software, different soft bits are stored and managed according to different HARQ processes, and currently occupied or available buffers can be statistically output. And may release the buffer as directed by the decode module.
The decoding module can complete decoding of the LDPC, and perform CRC (cyclic redundancy check) to output whether the decoding is successful or failed.
The feedback module determines feedback information according to the current idle bit number which can be cached by the soft bit caching module and the output of the decoding module.
And the scheduling module receives the feedback information and performs HARQ scheduling according to the received feedback information. And instructing the sending module to send again.
A transmission method based on the transmission device comprises the following steps:
s1, the scheduling module schedules a retransmission or a new transmission according to the current feedback information and the buffer of the service data waiting to be sent;
s2, the sending module sends data according to the instruction of the scheduling module;
s3, the demodulation module decodes the received sending data and buffers the soft bit into the soft bit buffer module;
s4, the soft bit buffer module sends the new transmission and retransmission soft bit received in the HARQ Process to the decoding module for decoding;
s5, the decoding module informs the feedback module of the decoding result, if the decoding module succeeds in decoding, the soft bit cache module is informed to clear all cache bits of the corresponding HARQ Process, and the soft bit cache module informs the feedback module of the current cache state information;
and S6, the feedback module constructs feedback information according to the input of the decoding module and the soft bit buffer module and feeds the feedback information back to the scheduling module.
As shown in fig. 4, step S1 specifically includes the following steps: when receiving the information that the decoding result of a certain HARQ Process is in a successful state, calculating the number Q of idle available bits of a receiving module cache, the bit size B of a data cache waiting to be sent in a sending module and the bit number C of an air interface capable of bearing in the sending interval, taking the minimum value in Q, B, C as N, and scheduling a newly-transmitted HARQ Process containing N information bits; when receiving the information that the decoding result of a certain HARQ Process is in an unsuccessful state, calculating the number Q of idle available bits and the number P of check bits meeting the requirement of a target bit error rate cached by a receiving module, taking the number C of bits which can be carried by an air interface in the sending interval as N, and scheduling the retransmission HARQ Process containing N check bits, wherein the minimum value in Q, P, C is N.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A HARQ transmission device based on shared buffer is characterized in that the device comprises a receiving module and a transmitting module,
the receiving module comprises a demodulation module, a decoding module, a soft bit buffer module and a feedback module,
a demodulation module for demodulating the received signal into soft bit information and outputting it to a decoding module;
a decoding module, configured to perform decoding processing on all soft bit information of the currently received HARQ Process, including newly transmitted soft bits and soft bits received in each retransmission and combined, and output an indication of decoding success or failure, where if the decoding success indicates that the soft bit cache module releases all soft bits corresponding to the HARQ Process, and after decoding, output a decoding result to the feedback module;
a soft bit buffer module: the device is used for caching the received soft bit information at the current sending time according to the number of the HARQ Process sent at this time, all the HARQ processes share all the storage space, when the transmission is retransmission, repeated bits are merged and updated, the bits transmitted for the first time are stored, when a decoding module needs to decode a certain HARQ Process, all the soft bits corresponding to the HARQ Process are output to the decoding module for decoding, and meanwhile, the current cache occupation condition is output to the feedback module.
The feedback module is used for feeding back the decoding result and the residual available buffer bit number to the sending module according to the currently received decoding result of the decoding module and the occupation condition of the buffer;
the sending module comprises a sending module and a scheduling module,
the sending module is used for sending signals according to the HARQ information scheduled by the scheduling module;
the scheduling module is used for performing HARQ scheduling according to the received feedback information, when the decoding result of a certain HARQ Process is information of a successful state, calculating the idle available bit number Q of a receiving module cache, the bit size B of a data cache to be sent in the sending module and the bit number C of an air interface which can be borne in the sending interval, taking the minimum value in Q, B, C as N, and scheduling a newly-transmitted HARQ Process containing N information bits; when receiving the information that the decoding result of a certain HARQ Process is in an unsuccessful state, calculating the number Q of idle available bits and the number P of check bits meeting the requirement of a target bit error rate cached by a receiving module, taking the number C of bits which can be carried by an air interface in the sending interval as N, and scheduling the retransmission HARQ Process containing N check bits, wherein the minimum value in Q, P, C is N.
2. A transmission method based on the transmission apparatus of claim 1, comprising the steps of:
s1, the scheduling module schedules a retransmission or a new transmission according to the current feedback information and the buffer of the service data waiting to be sent;
s2, the sending module sends data according to the instruction of the scheduling module;
s3, the demodulation module decodes the received sending data and buffers the soft bit into the soft bit buffer module;
s4, the soft bit buffer module sends the new transmission and retransmission soft bit received in the HARQ Process to the decoding module for decoding;
s5, the decoding module informs the feedback module of the decoding result, if the decoding module succeeds in decoding, the soft bit cache module is informed to clear all cache bits of the corresponding HARQ Process, and the soft bit cache module informs the feedback module of the current cache state information;
and S6, the feedback module constructs feedback information according to the input of the decoding module and the soft bit buffer module and feeds the feedback information back to the scheduling module.
3. The transmission method according to claim 2, wherein the step S1 specifically includes the following steps: when receiving the information that the decoding result of a certain HARQ Process is in a successful state, calculating the number Q of idle available bits of a receiving module cache, the bit size B of a data cache waiting to be sent in a sending module and the bit number C of an air interface capable of bearing in the sending interval, taking the minimum value in Q, B, C as N, and scheduling a newly-transmitted HARQ Process containing N information bits; when receiving the information that the decoding result of a certain HARQ Process is in an unsuccessful state, calculating the number Q of idle available bits and the number P of check bits meeting the requirement of a target bit error rate cached by a receiving module, taking the number C of bits which can be carried by an air interface in the sending interval as N, and scheduling the retransmission HARQ Process containing N check bits, wherein the minimum value in Q, P, C is N.
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| JP2021543484A JP7304013B2 (en) | 2020-07-15 | 2021-02-03 | HARQ transmission apparatus and transmission method based on shared buffer |
| PCT/CN2021/074969 WO2022012032A1 (en) | 2020-07-15 | 2021-02-03 | Harq transmission apparatus and method based on shared cache |
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| JP2022544728A (en) | 2022-10-21 |
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| JP7304013B2 (en) | 2023-07-06 |
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