CN111884775B - HARQ transmission device and method based on shared buffer - Google Patents
HARQ transmission device and method based on shared buffer Download PDFInfo
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- CN111884775B CN111884775B CN202010679406.2A CN202010679406A CN111884775B CN 111884775 B CN111884775 B CN 111884775B CN 202010679406 A CN202010679406 A CN 202010679406A CN 111884775 B CN111884775 B CN 111884775B
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- 238000013499 data model Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 5
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Classifications
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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
- 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
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
- H04L1/0063—Single parity check
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
Abstract
The invention discloses a HARQ transmission device and method based on shared buffer, the method comprises the following steps: s1, a scheduling module schedules a retransmission or a new transmission according to current feedback information and a buffer memory of service data waiting to be transmitted; s2, the first sending module sends data according to the instruction of the scheduling module; s3, the demodulation module decodes the received sent data and caches the soft bits into the soft bit cache module; s4, the soft bit buffer module sends the soft bits received so far in the corresponding HARQ Process to the decoding module for decoding; s5, the decoding module informs the feedback module of the decoding result, if the decoding module is successful in decoding, the soft bit buffer module is informed to clear all buffer bits of the corresponding HARQ Process, and the soft bit buffer module informs the feedback module of the current buffer state information; s6, a 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 business 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. Particularly in a 5G communication system, in order to save hardware cost and increase software flexibility, a distributed scheme with different segmentation ports is adopted. The basic processing Unit BBU of the 5G access network is reconfigured into three functional entities, i.e., CU (Centralized Unit), DU (Distributed Unit), RU (Remote Unit). In the mainstream segmentation scheme Option 7.2 at present, CU equipment processes wireless high-layer protocol stack functions, such as an RRC layer, a PDCP layer and the like, and even can support a part of core network functions to sink to an access network, so that higher requirements of a future communication network on emerging services such as video and network purchase and virtual/augmented reality on network delay are met. The DU device mainly processes part of physical layer functions and layer 2 functions with higher real-time requirements, such as a scheduler and the like, and the RU comprises a radio frequency module and part of physical layer functions.
Between DU and RU, connection is made through FH (FrountHaul). Because of the different FH schemes, different delays are incurred between the DU and RU. In some cases, these instabilities and possibly quite significant delays can have a considerable impact on the scheduler located in the DU, especially with respect to HARQ (Hybrid Automatic Repeat reQuest, hybrid adaptive retransmission). After the HARQ technology is adopted, if a certain transmission fails, the receiving side needs to buffer the soft bit information sent at the time, wait for the next retransmission of the same data, combine the received retransmission data and re-decode. Since in non-ideal FH the delay between scheduler and RU is large, a long wait time is required between new transmission and retransmission of data, so that the receiving side needs a lot of memory to buffer the received data bits. If the receiving end is a terminal device and adopts a chip design, the memory capacity is limited by the cost, the area and the power consumption of the chip, and the unlimited growth is impossible.
The current strategy for HARQ in 4g,5g is to divide the memory into different HARQ processes of the same size. And each time the data transmission occupies an idle HARQ Process, when decoding of a receiving end fails, soft bits waiting for combination are stored in a buffer corresponding to the HARQ Process, and the soft bits are combined when retransmission arrives until the decoding is successful or the HARQ is overtime.
Although this is simple and has small signaling overhead, the requirement for the number of HARQ processes increases dramatically when the delay on FH increases for a distributed system, and particularly for a 5G high frequency system with a short transmission interval, the transmission time interval is 0.125ms at a subcarrier interval of 120KHz, and the delay of 3ms corresponds to 24 transmission intervals, so that 24 HARQ processes need to be increased for one FDD system.
Since the buffer of each HARQ Process needs to be reserved according to the maximum possible size of the transmission data block, when a huge amount of HARQ processes are needed, the buffer is very inefficient in uniformly dividing the buffer according to different HARQ processes. This division will lead to a significant waste of buffering, especially when the user has a continuous packet transmission. This causes a sharp rise 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 buffer technology among HARQ processes, 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 above purpose, the technical scheme adopted by the invention is as follows:
an 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,
the demodulation module is used for demodulating the received signal into soft bit information and outputting the soft bit information to the decoding module;
the decoding module is used for decoding all soft bit information of the HARQ Process which is currently received, including newly transmitted soft bits and received soft bits after retransmission each time, outputting an indication of success or failure of decoding, and indicating the soft bit buffer module to release all soft bits corresponding to the HARQ Process after the decoding is successful, and outputting a decoding result to the feedback module after the decoding is completed;
soft bit buffer module: and the decoding module is used for outputting all the soft bits corresponding to the HARQ Process to the decoding module for decoding when decoding the HARQ Process, and outputting the current buffer occupation condition 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 decoding result of the currently received decoding module and the buffer occupancy;
the transmission module comprises a first transmission module and a scheduling module,
the first sending module is used for sending signals according to the HARQ information scheduled by the scheduling module;
the scheduling module is used for carrying out HARQ scheduling according to the received feedback information, when receiving the information that the decoding result of a certain HARQ Process is in a successful state, calculating the available bit number Q of the buffer memory of the receiving module, the bit size B in the data buffer memory waiting to be transmitted in the first transmitting module and the bit number C which can be borne by an air interface in the transmission interval, taking the minimum value in Q, B, C as N, and scheduling a new transmission 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 bits available for caching idle by a receiving module and the number P of check bits meeting the requirement of a target error rate, taking the minimum value in Q, P, C as N of the number C of bits which can be borne by an air interface at the sending interval, and scheduling the retransmission HARQ Process containing N check bits.
The transmission method based on the transmission device comprises the following steps:
s1, a scheduling module schedules a retransmission or a new transmission according to current feedback information and a buffer memory of service data waiting to be transmitted;
s2, the first sending module sends data according to the instruction of the scheduling module;
s3, the demodulation module decodes the received sent data and caches the soft bits into the soft bit cache module;
s4, the soft bit buffer module sends the soft bits received so far in the corresponding HARQ Process to the decoding module for decoding;
s5, the decoding module informs the feedback module of the decoding result, if the decoding module is successful in decoding, the soft bit buffer module is informed to clear all buffer bits of the corresponding HARQ Process, and the soft bit buffer module informs the feedback module of the current buffer state information;
s6, a 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 further technical scheme is that the step S1 specifically comprises 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 bits available for the buffer storage of a receiving module, the bit size B in a data buffer to be transmitted in a first transmitting module and the bit number C which can be borne by an air interface in the transmission interval, taking the minimum value in Q, B, C as N, and scheduling a new transmission 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 bits available for caching idle by a receiving module and the number P of check bits meeting the requirement of a target error rate, taking the minimum value in Q, P, C as N of the number C of bits which can be borne by an air interface at the sending interval, and scheduling the retransmission HARQ Process containing N check bits.
Compared with the prior art, the invention has the following beneficial effects: the method can effectively save hardware cost, match different business 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 HARQ transmission device based on shared buffer according to the present invention;
FIG. 3 is a flow chart of the process between the modules of the present invention;
fig. 4 is a process flow diagram of a scheduling module.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of 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 extension units are connected to the central unit, while each extension unit is connected to 8 remote units. All remote units are configured as 1 cell. The forward transmission uses a passive optical network PON network, and typically, the delay is 1.5ms to 2ms.
Referring to fig. 2, fig. 2 is a schematic diagram of a shared buffer based HARQ transmission device of 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,
the demodulation module is used for demodulating the received signal into soft bit information and outputting the soft bit information to the decoding module;
the decoding module is used for decoding all soft bit information of the HARQ Process which is currently received, including newly transmitted soft bits and received soft bits after retransmission each time, outputting an indication of success or failure of decoding, and indicating the soft bit buffer module to release all soft bits corresponding to the HARQ Process after the decoding is successful, and outputting a decoding result to the feedback module after the decoding is completed;
soft bit buffer module: and the decoding module is used for outputting all the soft bits corresponding to the HARQ Process to the decoding module for decoding when decoding the HARQ Process, and outputting the current buffer occupation condition 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 decoding result of the currently received decoding module and the buffer occupancy;
the transmission module comprises a first transmission module and a scheduling module,
the first sending module is used for sending signals according to the HARQ information scheduled by the scheduling module;
the scheduling module is used for carrying out HARQ scheduling according to the received feedback information, when receiving the information that the decoding result of a certain HARQ Process is in a successful state, calculating the available bit number Q of the buffer memory of the receiving module, the bit size B in the data buffer memory waiting to be transmitted in the first transmitting module and the bit number C which can be borne by an air interface in the transmission interval, taking the minimum value in Q, B, C as N, and scheduling a new transmission 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 bits available for caching idle by a receiving module and the number P of check bits meeting the requirement of a target error rate, taking the minimum value in Q, P, C as N of the number C of bits which can be borne by an air interface at the sending interval, and scheduling the retransmission HARQ Process containing N check bits.
The first transmission module may employ LDPC (low density parity check code) coding and phase amplitude quadrature modulation using an OFDM (orthogonal frequency division multiplexing) waveform that may be transmitted.
The demodulation module is a receiving module with the capability of receiving OFDM (orthogonal frequency division multiplexing) waveforms and judging signals subjected to phase amplitude orthogonal modulation as soft bits.
The soft bit buffer module can be a memory management system on software, manages different soft bits according to different HARQ processes, and can statistically output the buffer which is currently occupied or available. And may release the cache according to the direction of the decoding module.
The decoding module can complete decoding of LDPC and perform CRC (cyclic redundancy check) to output whether the decoding is successful or failed.
The feedback module decides feedback information according to the current number of idle bits which can be buffered by the soft bit buffer 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 indicating the first transmitting module to transmit again.
The transmission method based on the transmission device comprises the following steps:
s1, a scheduling module schedules a retransmission or a new transmission according to current feedback information and a buffer memory of service data waiting to be transmitted;
s2, the first sending module sends data according to the instruction of the scheduling module;
s3, the demodulation module decodes the received sent data and caches the soft bits into the soft bit cache module;
s4, the soft bit buffer module sends the soft bits received so far in the corresponding HARQ Process to the decoding module for decoding;
s5, the decoding module informs the feedback module of the decoding result, if the decoding module is successful in decoding, the soft bit buffer module is informed to clear all buffer bits of the corresponding HARQ Process, and the soft bit buffer module informs the feedback module of the current buffer state information;
s6, a 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, 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 bits available for the buffer storage of a receiving module, the bit size B in a data buffer to be transmitted in a first transmitting module and the bit number C which can be borne by an air interface in the transmission interval, taking the minimum value in Q, B, C as N, and scheduling a new transmission 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 bits available for caching idle by a receiving module and the number P of check bits meeting the requirement of a target error rate, taking the minimum value in Q, P, C as N of the number C of bits which can be borne by an air interface at the sending interval, and scheduling the retransmission HARQ Process containing N check bits.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. An HARQ transmission device based on shared buffer is characterized by comprising a receiving module and a sending module,
the receiving module comprises a demodulation module, a decoding module, a soft bit buffer module and a feedback module,
the demodulation module is used for demodulating the received signal into soft bit information and outputting the soft bit information to the decoding module;
the decoding module is used for decoding all soft bit information of the HARQ Process which is currently received, including newly transmitted soft bits and received soft bits after retransmission each time, outputting an indication of success or failure of decoding, and indicating the soft bit buffer module to release all soft bits corresponding to the HARQ Process after the decoding is successful, and outputting a decoding result to the feedback module after the decoding is completed;
soft bit buffer module: the decoding module is used for decoding the HARQ Process, outputting all soft bits corresponding to the HARQ Process to the decoding module for decoding, and outputting the current buffer occupation condition 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 decoding result of the currently received decoding module and the buffer occupancy;
the transmission module comprises a first transmission module and a scheduling module,
the first sending module is used for sending signals according to the HARQ information scheduled by the scheduling module;
the scheduling module is used for carrying out HARQ scheduling according to the received feedback information, when receiving the information that the decoding result of a certain HARQ Process is in a successful state, calculating the available bit number Q of the buffer memory of the receiving module, the bit size B in the data buffer memory waiting to be transmitted in the first transmitting module and the bit number C which can be borne by an air interface in the transmission interval, taking the minimum value in Q, B, C as N, and scheduling a new transmission 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 bits available for caching by a receiving module and the number P of check bits meeting the requirement of a target bit error rate, taking the minimum value in Q, P, C as N, and scheduling the retransmission HARQ Process containing N check bits;
the first transmitting module uses an Orthogonal Frequency Division Multiplexing (OFDM) waveform capable of transmitting OFDM and adopts low density check code (LDPC) coding and phase amplitude quadrature modulation;
the demodulation module is a receiving module which is capable of receiving the Orthogonal Frequency Division Multiplexing (OFDM) waveform and judging the signal subjected to phase amplitude orthogonal modulation as soft bits;
the soft bit buffer module is a memory management system on software, stores and manages different soft bits according to different HARQ processes, can count and output the buffer which is currently occupied or available in idle, and can release the buffer according to the instruction of the decoding module;
the decoding module is used for finishing the decoding of LDPC, performing cyclic redundancy check CRC, and outputting whether the decoding is successful or failed;
the feedback module is used for determining feedback information according to the current cacheable idle bit number of the soft bit caching module and the output of the decoding module;
the scheduling module is used for receiving the feedback information, performing HARQ scheduling according to the received feedback information, and indicating the first transmitting module to transmit again.
2. A transmission method based on the transmission device according to claim 1, characterized by comprising the steps of:
s1, a scheduling module schedules a retransmission or a new transmission according to current feedback information and a buffer memory of service data waiting to be transmitted;
s2, the first sending module sends data according to the instruction of the scheduling module;
s3, the demodulation module decodes the received sent data and caches the soft bits into the soft bit cache module;
s4, the soft bit buffer module sends the soft bits received so far in the corresponding HARQ Process to the decoding module for decoding;
s5, the decoding module informs the feedback module of the decoding result, if the decoding module is successful in decoding, the soft bit buffer module is informed to clear all buffer bits of the corresponding HARQ Process, and the soft bit buffer module informs the feedback module of the current buffer state information;
s6, a 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. A transmission method according to claim 2 based on the transmission device according to claim 1, characterized in that step S1 comprises 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 bits available for the buffer storage of a receiving module, the bit size B in a data buffer to be transmitted in a first transmitting module and the bit number C which can be borne by an air interface in the transmission interval, taking the minimum value in Q, B, C as N, and scheduling a new transmission 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 bits available for caching idle by a receiving module and the number P of check bits meeting the requirement of a target error rate, taking the minimum value in Q, P, C as N of the number C of bits which can be borne by an air interface at the sending interval, and scheduling the retransmission HARQ Process containing N check bits.
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| CN202010679406.2A CN111884775B (en) | 2020-07-15 | 2020-07-15 | HARQ transmission device and method based on shared buffer |
| 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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| Publication number | Publication date |
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| WO2022012032A1 (en) | 2022-01-20 |
| CN111884775A (en) | 2020-11-03 |
| JP2022544728A (en) | 2022-10-21 |
| JP7304013B2 (en) | 2023-07-06 |
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