CN109217991B - Terminal overload processing method, terminal, base station and computer storage medium - Google Patents

Terminal overload processing method, terminal, base station and computer storage medium Download PDF

Info

Publication number
CN109217991B
CN109217991B CN201710538425.1A CN201710538425A CN109217991B CN 109217991 B CN109217991 B CN 109217991B CN 201710538425 A CN201710538425 A CN 201710538425A CN 109217991 B CN109217991 B CN 109217991B
Authority
CN
China
Prior art keywords
base station
harq buffer
nack
harq
ack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710538425.1A
Other languages
Chinese (zh)
Other versions
CN109217991A (en
Inventor
柯颋
胡丽洁
侯雪颖
童辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
Original Assignee
China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Mobile Communications Group Co Ltd, China Mobile Communications Ltd Research Institute filed Critical China Mobile Communications Group Co Ltd
Priority to CN201710538425.1A priority Critical patent/CN109217991B/en
Publication of CN109217991A publication Critical patent/CN109217991A/en
Application granted granted Critical
Publication of CN109217991B publication Critical patent/CN109217991B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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]
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling

Abstract

The invention discloses a processing method for terminal overload, a terminal, a base station and a computer storage medium, wherein the method comprises the following steps: a terminal (UE) receives a base station configuration signaling, and the UE reports the size of a downlink hybrid automatic repeat request (DL HARQ) buffer area according to the scheduling of the base station configuration signaling.

Description

Terminal overload processing method, terminal, base station and computer storage medium
Technical Field
The present invention relates to a terminal processing technology, and in particular, to a method for processing overload of a terminal (UE), a UE, a base station, and a computer storage medium.
Background
A Long Term Evolution (LTE) system supports a Downlink (DL) Hybrid Automatic Repeat reQuest (HARQ) retransmission mechanism. Specifically, if the UE receives a data packet sent by the base station but cannot demodulate correctly, the UE may store the received erroneous data packet in a HARQ soft buffer (DL HARQ soft buffer). Then, the UE feeds back packet loss retransmission (NACK) information to the base station, requesting the base station to retransmit the data. After receiving the retransmission data sent by the base station, the UE combines the newly received retransmission data packet with the old data packet in the DL HARQ soft buffer, so as to obtain a data packet more reliable than the single decoding, which is called as a "soft combining" process. The combined data packet is then decoded. If the decoding fails, the process of requesting retransmission and then carrying out soft combination is repeated.
Therefore, the DL HARQ soft buffer is mainly used for buffering DL data packets that have been determined to have failed demodulation, and DL data packets that may have failed demodulation (i.e. are being demodulated and have not yet obtained demodulation results).
In the LTE system, the UE determines the DL HARQ soft buffer Size according to the maximum number of DL HARQ processes supported by the system, the maximum DL Transport Block Size (TBS) supported by the UE, and the maximum DL Transport stream number. In short, the DL HARQ soft buffer size is equal to the number of DL HARQ processes supported by the system maximum × the maximum number of DL TBSs supported by the UE × the maximum number of DL transmission streams.
In the LTE system, under a normal condition, the actual utilization rate of the DL HARQ buffer is low, and a large resource waste phenomenon exists. In order to solve the problem of resource waste, in the related art, a terminal autonomously determines how to manage its DL HARQ buffer. However, this carries the risk of DL HARQ buffer overload. If overload occurs, the UE cannot receive and store more HARQ process data, so that a serious short-time packet loss phenomenon occurs. In the related art, there is no effective solution to the problem of how to avoid the overload of the UE soft buffer.
Disclosure of Invention
In view of the above, embodiments of the present invention are to provide a method for handling UE overload, a UE, a base station, and a computer storage medium, which at least solve the problems in the prior art.
The technical scheme of the embodiment of the invention is realized as follows:
the method for processing the terminal overload comprises the following steps:
a terminal UE receives a base station configuration signaling;
and the UE reports the size of the DL HARQ buffer according to the scheduling of the base station configuration signaling.
In the foregoing solution, the base station configuring signaling includes: at least one of Radio Resource Control (RRC) signaling, system message, and Downlink Control Information (DCI) signaling.
In the above scheme, the reporting, by the UE, the DL HARQ buffer size includes:
and the UE reports the DL HARQ buffer area size as an attribute of the UE capability of the UE to a base station.
In the above scheme, the method further comprises:
and the UE receives the scheduling of the base station according to the service condition of the base station to the DL HARQ buffer area.
In the foregoing solution, the service condition of the DL HARQ buffer estimation is specifically realized by the following formula:
m+α×n；
wherein m is the bit number of all NACK process caches; alpha is a ratio coefficient of values in the interval of [0, 1 ]; n is the number of buffered bits of all processes which have not fed back ACK/NACK.
In the above scheme, when α is 0, the base station estimates that all processes that have not fed back ACK/NACK may be ACK;
when alpha is 1, the base station estimates that all processes which do not feed back ACK/NACK are possible to be NACK;
when α is 0.1, the base station estimates that 10% of the processes for which ACK/NACK has not been fed back may be NACK.
The base station determines the maximum schedulable new transmission data based on the size of the DL HARQ buffer and the estimated use condition of the DL HARQ buffer, and the method is specifically realized by the following formula:
X＝Y-Y1；
wherein X is newly transmitted data which can be scheduled maximally; y is DL HARQ buffer size; y1 is the usage of DL HARQ buffer prediction.
For example, Y is not 1000 Kbit; for a given value of α, the base station estimates that the DL HARQ buffer has used 800Kbit, and then the base station can schedule newly transmitted data of 1000-.
Of course, the base station may schedule retransmission data of multiple processes this time.
In the above scheme, the UE receives the scheduling of the base station according to the estimated use condition of the DL HARQ buffer by the base station.
The method for processing the terminal overload comprises the following steps:
a base station issues a base station configuration signaling;
the base station schedules the terminal UE according to the base station configuration signaling;
and the base station receives the size of the DL HARQ buffer reported after the UE responds to the scheduling.
In the above scheme, the method further comprises:
when the base station executes the scheduling, the service condition of a DL HARQ buffer area at the UE side is estimated;
the estimating of the use condition of the DL HARQ buffer at the UE side is specifically realized by the following formula:
m+α×n；
wherein m is the bit number of all NACK process caches; alpha is a ratio coefficient of values in the interval of [0, 1 ]; n is the number of buffered bits of all processes which have not fed back ACK/NACK.
In the above scheme, the base station determines the maximum schedulable new transmission data based on the size of the DL HARQ buffer and the estimated use condition of the DL HARQ buffer, and is specifically implemented by the following formula:
X＝Y-Y1；
wherein X is newly transmitted data which can be scheduled maximally; y is DL HARQ buffer size; y1 is the usage of DL HARQ buffer prediction.
For example, Y is not 1000 Kbit; for a given value of α, the base station estimates that the DL HARQ buffer has used 800Kbit, and then the base station can schedule newly transmitted data of 1000-.
Of course, the base station may schedule retransmission data of multiple processes this time.
In the above scheme, the method further comprises:
when the base station schedules new transmission, whether the UE side is in an overload state or not is predicted according to the estimated use condition of the DL HARQ buffer area so as to schedule the UE; wherein the content of the first and second substances,
when α is 1, the usage of the DL HARQ buffer prediction is as follows: if the DL HARQ buffer area is in a full load state, the base station schedules retransmission data for the UE;
when α is 0, the usage of the DL HARQ buffer prediction is as follows: if the DL HARQ buffer is not in a full load state, the base station schedules new transmission data for the UE;
when alpha is more than or equal to 0 and less than or equal to 1, the predicted use condition of the DL HARQ buffer is as follows: and if the DL HARQ buffer is not in a full load state, the base station schedules new transmission data for the UE.
The method for processing the terminal overload comprises the following steps:
determining that the DL HARQ buffer is overloaded;
the UE feeds back predefined DL HARQ buffer overload status on pre-configured acknowledgement information (ACK/NACK) resources.
In the foregoing solution, the predefined DL HARQ buffer overload status includes:
and the UE does not feed back ACK/NACK information on the pre-configured ACK/NACK resources.
In the foregoing solution, the predefined DL HARQ buffer overload status includes:
and the UE feeds back a bit combination with a predefined format on the pre-configured ACK/NACK resource.
In the foregoing solution, the predefined DL HARQ buffer overload status includes:
and when the ACK/NACK information is transmitted on the corresponding resource of the uplink control channel of at least one slot (slot), the UE feeds back a bit combination with a predefined format on the predefined slot.
In the foregoing solution, the predefined DL HARQ buffer overload status includes:
and when the ACK/NACK information is transmitted on the corresponding resource of the uplink control channel of at least one slot, the UE feeds back an abnormal ACK/NACK information format.
In the above scheme, the method further comprises: after the UE feeds back the predefined DL HARQ buffer overload status on the pre-configured ACK/NACK resources,
the UE receives the scheduling of the base station according to a first scheduling signaling sent by the base station;
the UE reports first information;
the first information includes: at least one of DL HARQ buffer overload phenomenon confirmation information, ACK/NACK feedback information of all or part of HARQ processes and HARQ process number updating reporting information which can be supported by the UE to the maximum.
In the above scheme, the method further comprises: after the UE feeds back the predefined DL HARQ buffer overload status on the pre-configured ACK/NACK resources,
the UE expects to receive a first scheduling signaling sent by a base station in a first time window.
A computer-readable storage medium of an embodiment of the present invention, on which a computer program is stored, is characterized in that the computer program, when executed by a processor, implements the steps of the method according to any one of the above schemes.
A terminal according to an embodiment of the present invention includes:
a memory for storing a computer program capable of running on the processor;
a processor for performing the steps of the method according to any of the previous solutions when running the computer program.
A base station according to an embodiment of the present invention includes:
a memory for storing a computer program capable of running on the processor;
a processor for performing the steps of the method according to any of the previous solutions when running the computer program.
The method for processing the UE overload comprises the following steps: and the UE receives the base station configuration signaling, and reports the size of the DL HARQ buffer area according to the scheduling of the base station configuration signaling.
By adopting the embodiment of the invention, the UE reports the size of the DL HARQ buffer area through the scheduling executed by the base station configuration signaling sent by the base station, thereby preventing the overload of the soft buffer area and avoiding the overload problem of the UE soft buffer area.
Drawings
FIG. 1 is a flowchart illustrating a method according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method implementation according to a second embodiment of the present invention.
Detailed Description
The following describes the embodiments in further detail with reference to the accompanying drawings.
The LTE system supports DL HARQ retransmission mechanisms. Specifically, if the UE receives a data packet sent by the base station but cannot demodulate correctly, the UE will store the received erroneous data packet in a HARQ soft buffer. Then, the UE feeds back NACK information to the base station, and requests the base station to retransmit the data. After receiving the retransmission data sent by the base station, the UE combines the newly received retransmission data packet with the old data packet in the DL HARQ soft buffer, so as to obtain a data packet more reliable than the single decoding, which is called as a "soft combining" process. The combined data packet is then decoded. If the decoding fails, the process of requesting retransmission and then carrying out soft combination is repeated. Therefore, the DL HARQ soft buffer is mainly used for buffering DL data packets that have been determined to have failed demodulation, and DL data packets that may have failed demodulation (i.e. are being demodulated and have not yet obtained demodulation results).
In an LTE system, UE determines the size of a DL HARQ soft buffer according to the maximum DL HARQ process number supported by the system, the maximum DL TBS supported by the UE and the maximum DL transmission stream number. In short, the DL HARQ soft buffer size is equal to the number of DL HARQ processes supported by the system maximum × the maximum number of DL TBSs supported by the UE × the maximum number of DL transmission streams. Note that in the LTE system, the UE informs the base station of its maximum supported DL TBS through a terminal capability reporting mechanism.
In particular, in the LTE system, the maximum number of supported DL HARQ processes used by each UE is the same.
Note that in one aspect, the DL HARQ buffer size affects the terminal cost, i.e. the larger the DL HARQ buffer size, the higher the terminal cost. On the other hand, in most cases, the actual usage load of the DL HARQ buffer of the UE is generally low.
Obviously, a UE will only use a full DL HARQ buffer if all DL HARQ processes fail demodulation and each DL HARQ process schedules the maximum DL TBS resource and the maximum number of DL transmission streams. In other cases, the DL HARQ buffer is not full.
In particular, the UE is not always able to schedule the maximum DL TBS resource in general, and the base station generally schedules transmission resources according to a 10% block error rate (BLER) target, so typically only 10% of HARQ processes will fail demodulation.
In summary, in the LTE system, in general, the actual utilization rate of the DL HARQ buffer is low, and a large waste phenomenon exists.
In order to solve the problem of resource waste of DL HARQ buffers, when designing a 5G next generation (NR) system, many mainstream companies tend to let a terminal manufacturer autonomously determine how to manage its DL HARQ buffers, and let a UE autonomously report its maximum number of DL HARQ processes supported, and allow its allocated DL HARQ buffer size to be less than < the maximum number of DL HARQ processes supported by the UE × the maximum number of DL TBS supported by the UE × the maximum number of DL transmission streams. Note that in NR systems, different UEs are allowed to support different maximum DL HARQ process numbers.
A possible calculation method of the size of the DL HARQ buffer area comprises the following steps: the DL HARQ buffer size is k × the number of DL HARQ processes supported by the UE maximum × the DL TBS supported by the UE maximum × the maximum number of DL transport streams. Where k < <1, for example, k is 0.2.
However, comparing the DL HARQ buffer size calculation methods in the LTE system and the NR system, it can be found that: the DL HARQ buffer size calculation method in the LTE system is too conservative, and the DL HARQ buffer is configured according to the worst case (all processes NACK and all processes maximum TBS transmission), so there is a large resource waste phenomenon in the general case.
The new approach in NR systems may present a DL HARQ buffer overload risk. For example, the terminal manufacturer does not set k to 0.2. In a typical case of 10% BLER and non-full TBS data transmission, the actual DL HARQ buffer load for the UE may be less than 50%. However, when the UE channel environment is suddenly poor (e.g. large occlusion occurs), the NACK process is increased sharply, resulting in a sudden burst of DL HARQ buffer. At this time, the UE cannot receive and store more HARQ process data, and a serious short-time packet loss phenomenon occurs.
For the overload problem, the embodiments of the present invention can effectively avoid the overload problem through a mechanism for preventing and reporting the overload phenomenon of the DL HARQ buffer, and the specific description is as follows.
The first embodiment is as follows: and reporting the size of the DL HARQ buffer area through the UE, and preventing the overload phenomenon of the DL HARQ buffer area.
As shown in fig. 1, a method for processing terminal overload according to an embodiment of the present invention includes:
step 101, the UE receives a base station configuration signaling.
And step 102, reporting the size of the DL HARQ buffer area by the UE according to the scheduling of the base station configuration signaling.
The UE side DL HARQ buffer overload phenomenon may occur in the NR system. Although the DL HARQ buffer overload phenomenon is a small probability behavior, it may have a large impact on the UE data transmission capability if no additional processing is performed. By adopting the embodiment of the invention, the probability of sending overload is reduced by reporting the size of the buffer area. In other words, the prevention mechanism of the embodiment of the present invention is used to reduce the occurrence probability of the DL HARQ buffer overload phenomenon, and avoid causing a greater impact on the communication system.
In an embodiment of the present invention, the base station configuring signaling includes: at least one of RRC signaling, system messages, and DCI signaling. It can be seen that the base station can configure the UE to report its DL HARQ buffer size through at least one of RRC signaling, system message, and DCI signaling, and the UE reports its DL HARQ buffer size after receiving the base station configuration signaling.
In an embodiment of the present invention, the reporting, by the UE, the size of the DL HARQ buffer includes: and the UE reports the DL HARQ buffer area size as an attribute of the UE capability of the UE to a base station.
In an embodiment of the present invention, the base station may avoid the overload problem of the DL HARQ buffer at the UE side through a scheduling mechanism. Specifically, when the base station performs scheduling, the service condition of a DL HARQ buffer area at the UE side is estimated, and the UE receives the scheduling of the base station according to the estimated service condition of the DL HARQ buffer area by the base station.
In an embodiment of the present invention, the usage of the estimated DL HARQ buffer is specifically realized by the following formula:
the bit number of all NACK processes is plus alpha multiplied by the bit number of all processes which do not feed back ACK/NACK; wherein alpha is a ratio coefficient of values in the interval of [0, 1 ].
In an embodiment of the present invention, when the ratio coefficient α is 0, it represents the optimistic estimation, that is, the base station guesses that all processes that have not fed back ACK/NACK may be ACK; when the ratio α is 1, it represents the most pessimistic estimation, i.e. the bs guesses that all processes that have not fed back ACK/NACK may be NACK; when the ratio coefficient α is 0.1, it represents a typical estimation that the base station guesses that 10% of the processes that have not fed back ACK/NACK may be NACK. In general, the ratio coefficient α should be a certain coefficient greater than 0 and smaller than 1.
In an embodiment of the present invention, the receiving, by the UE, scheduling of the base station according to the estimated use condition of the DL HARQ buffer by the base station includes: when the base station schedules new transmission, the possible occupation condition of the DL HARQ buffer area of the UE side is considered, and the overload problem of the DL HARQ buffer area of the UE side is avoided. For example, when the UE side DL HARQ buffer size is 300000 bits, if the base station finds that the number of bits buffered for all NACK progresses is 100000 bits, the number of bits buffered for all processes that have not fed back ACK/NACK is 200000 bits.
When the ratio coefficient α is 1, the usage of the DL HARQ buffer prediction is as follows: and the DL HARQ buffer area is in a full load state, and the UE receives retransmission data scheduled by the base station for the DL HARQ buffer area. In this case, the base station predicts that the UE side DL HARQ buffer is full. At this time, the base station will only send the retransmission data to the UE, and will not schedule new transmission data until receiving ACK feedback.
When the ratio coefficient α is 0, the usage of the DL HARQ buffer prediction is: and the DL HARQ buffer is not in a full-load state, and the UE receives new transmission data scheduled by the base station. In this case, the base station predicts that 200000 bits are still free for the UE side DL HARQ buffer. Therefore, the base station may schedule the UE to receive new transmission data, and the new transmission data is less than or equal to 200000 bits.
When alpha is more than or equal to 0 and less than or equal to 1, the predicted use condition of the DL HARQ buffer is as follows: and the DL HARQ buffer is not in a full-load state, and the UE receives new transmission data scheduled by the base station. In this case, the base station predicts that the UE side DL HARQ buffer is still free for 200000(1- α) bits to be available. Therefore, the base station may schedule the UE to receive new transmission data, and the new transmission data is less than or equal to 200000(1- α) bit.
In a specific implementation of the above embodiment, when α is 1, the base station makes pessimistic estimation on possible occupancy of the DL HARQ buffer on the UE side. At this time, the UE side will not suffer from the DL HARQ buffer overload problem. However, if there are more processes on the UE side that have not fed back ACK/NACK (e.g. DL is more and UL is less, and the UE has no chance to feed back ACK/NACK), the scheduling on the base station side will be too cautious, and the data transmission rate of the UE will be reduced.
On the contrary, when α ≠ 1, there is a certain probability that the DL HARQ buffer overload problem on the UE side always occurs due to the determination error.
In addition, in the first embodiment, the base station completely controls the usage of the DL HARQ buffer on the UE side, and the UE side lacks the implementation freedom.
A computer-readable storage medium of an embodiment of the invention, on which a computer program is stored, is characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any of the above embodiments.
A terminal according to an embodiment of the present invention includes: a memory for storing a computer program capable of running on the processor; and a processor for performing the steps of the method according to any one of the preceding embodiments when the computer program is run.
A terminal according to an embodiment of the present invention includes:
a receiving unit, configured to receive a base station configuration signaling;
and the reporting unit is used for reporting the size of the DL HARQ buffer area according to the scheduling of the base station configuration signaling.
In an embodiment of the present invention, the base station configuring signaling includes: at least one of radio resource control, RRC, signaling, system message, and downlink control information, DCI, signaling.
In an implementation manner of the embodiment of the present invention, the reporting unit is further configured to: and reporting the DL HARQ buffer area size as an attribute of the UE capability of the DL HARQ buffer area to a base station.
In an implementation manner of the embodiment of the present invention, the terminal further includes: and the scheduling receiving unit is used for receiving the scheduling of the base station according to the estimated use condition of the DL HARQ buffer area by the base station.
In an embodiment of the present invention, the usage of the estimated DL HARQ buffer is specifically realized by the following formula:
the bit number of all NACK processes is plus alpha multiplied by the bit number of all processes which do not feed back ACK/NACK; wherein alpha is a ratio coefficient of values in the interval of [0, 1 ].
In an embodiment of the present invention, the following conditions are included:
when α is 0, all processes that have not fed back ACK/NACK may be ACKs;
when α is 1, all processes that have not fed back ACK/NACK may be NACK;
when α is 0.1, 10% of the processes that have not fed back ACK/NACK may be NACK.
In an embodiment of the present invention, the scheduling receiving unit is further configured to receive scheduling of the base station according to a usage situation of the DL HARQ buffer estimated by the base station, where the scheduling includes the following situations:
when α is 1, the usage of the DL HARQ buffer prediction is as follows: the DL HARQ buffer area is in a full load state, and the UE receives retransmission data scheduled for the DL HARQ buffer area by the base station;
when α is 0, the usage of the DL HARQ buffer prediction is as follows: the DL HARQ buffer is not in a full load state, and the UE receives new transmission data scheduled for the DL HARQ buffer by the base station;
when alpha is more than or equal to 0 and less than or equal to 1, the predicted use condition of the DL HARQ buffer is as follows: and the DL HARQ buffer is not in a full-load state, and the UE receives new transmission data scheduled by the base station.
Correspondingly, in a first embodiment, on the base station side, the method includes: a base station issues a base station configuration signaling; the base station schedules the terminal UE according to the base station configuration signaling; and the base station receives the size of a downlink hybrid automatic repeat request (DL HARQ) buffer reported after the UE responds to the scheduling.
In an implementation manner of the embodiment of the present invention, the method further includes: and when the base station executes the scheduling, estimating the use condition of a DL HARQ buffer area at the UE side.
The estimating of the usage of the DL HARQ buffer at the UE side is specifically implemented by the following formula:
the bit number of all NACK processes is plus alpha multiplied by the bit number of all processes which do not feed back ACK/NACK;
wherein alpha is a ratio coefficient of values in the interval of [0, 1 ].
In an implementation manner of the embodiment of the present invention, the method further includes:
when the base station schedules new transmission, whether the UE side is in an overload state or not is predicted according to the estimated use condition of the DL HARQ buffer area so as to schedule the UE; wherein the content of the first and second substances,
when α is 1, the usage of the DL HARQ buffer prediction is as follows: if the DL HARQ buffer area is in a full load state, the base station schedules retransmission data for the UE;
when α is 0, the usage of the DL HARQ buffer prediction is as follows: if the DL HARQ buffer is not in a full load state, the base station schedules new transmission data for the UE;
when alpha is more than or equal to 0 and less than or equal to 1, the predicted use condition of the DL HARQ buffer is as follows: and if the DL HARQ buffer is not in a full load state, the base station schedules new transmission data for the UE.
A computer-readable storage medium of an embodiment of the invention, on which a computer program is stored, is characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any of the above embodiments.
A base station according to an embodiment of the present invention includes: a memory for storing a computer program capable of running on the processor; and a processor for performing the steps of the method according to any one of the preceding embodiments when the computer program is run.
A base station according to an embodiment of the present invention includes:
a signaling issuing unit, configured to issue a base station configuration signaling;
the scheduling unit is used for scheduling the terminal UE according to the base station configuration signaling;
and the receiving unit is used for receiving the size of a downlink hybrid automatic repeat request (DL HARQ) buffer reported by the UE after responding to the scheduling.
In an embodiment of the present invention, the scheduling unit is further configured to estimate a usage condition of a DL HARQ buffer at the UE side when the base station performs the scheduling. The estimating of the usage of the DL HARQ buffer at the UE side is specifically implemented by the following formula:
the bit number of all NACK processes is plus alpha multiplied by the bit number of all processes which do not feed back ACK/NACK;
wherein alpha is a ratio coefficient of values in the interval of [0, 1 ].
In an embodiment of the present invention, the scheduling unit is further configured to predict whether the UE side is in an overload state according to a predicted use condition of the DL HARQ buffer when the base station schedules a new transmission, so as to schedule the UE; wherein the content of the first and second substances,
when α is 1, the usage of the DL HARQ buffer prediction is as follows: if the DL HARQ buffer area is in a full load state, the base station schedules retransmission data for the UE;
when α is 0, the usage of the DL HARQ buffer prediction is as follows: if the DL HARQ buffer is not in a full load state, the base station schedules new transmission data for the UE;
when alpha is more than or equal to 0 and less than or equal to 1, the predicted use condition of the DL HARQ buffer is as follows: and if the DL HARQ buffer is not in a full load state, the base station schedules new transmission data for the UE.
Example two:
in view of the above problems of the first embodiment, the second embodiment focuses on: and a UE side reporting mechanism after the overload phenomenon of the DL HARQ buffer area of the UE occurs. It is determined that overload has occurred and rapid recovery is required.
It should be noted that: the second embodiment can be used as a complementary mechanism of the embodiment 1 only when α ≠ 1, and can also independently work without depending on the embodiment 1.
As shown in fig. 2, a method for processing terminal overload according to an embodiment of the present invention includes:
step 201, UE determines that the DL HARQ buffer area is overloaded;
step 202, the UE feeds back the predefined DL HARQ buffer overload status on the preconfigured ACK/NACK resource.
The UE side DL HARQ buffer overload phenomenon may occur in the NR system. Although the DL HARQ buffer overload phenomenon is a small probability behavior, it may have a large impact on the UE data transmission capability if no additional processing is performed. By adopting the reporting mechanism of the embodiment of the invention, the system can quickly recover from the overload problem of the DL HARQ buffer at the UE side, thereby avoiding causing more influence on the communication system. In each specific implementation of this embodiment, the method includes: when determining that the DL HARQ buffer is transmitted in an overload state, the UE feeds back a predefined DL HARQ buffer overload state on the pre-configured ACK/NACK resource and several specific indication methods thereof. And the base station receives the behavior of the UE after the UE reports the overload phenomenon of the DL HARQ buffer area, and the like.
In an implementation manner of the second embodiment of the present invention, the predefined DL HARQ buffer overload state includes: and the UE does not feed back ACK/NACK information on the pre-configured ACK/NACK resources.
And the base station regards the behavior that the UE does not feed back the ACK/NACK information on the pre-configured ACK/NACK resource as a possible DL HARQ buffer overload phenomenon reporting event. For example, for each HARQ process, the base station configures the feedback resource of 1bit ACK/NACK information in advance. When the overload phenomenon of the DL HARQ buffer area does not occur, the UE feeds back ACK/NACK information on the pre-configured ACK/NACK resource; and when the overload phenomenon of the DL HARQ buffer area is confirmed, the UE does not feed back the ACK/NACK information on the pre-configured ACK/NACK resources.
In an implementation manner of the second embodiment of the present invention, the predefined DL HARQ buffer overload state includes: and the UE feeds back a bit combination with a predefined format on the pre-configured ACK/NACK resource. For example, for each HARQ process, the base station configures feedback resources of 2-bit ACK/NACK information in advance, and defines a certain bit combination (e.g., bit combination 1,1 represents DL HARQ buffer overload status) to represent DL HARQ buffer overload status. When confirming that the DL HARQ buffer overload phenomenon occurs, the UE feeds back a predefined DL HARQ buffer overload state (e.g. bit combination 1,1) on the preconfigured ACK/NACK resource.
In an implementation manner of the second embodiment of the present invention, the predefined DL HARQ buffer overload state includes: and when the ACK/NACK information is transmitted on the corresponding resource of the uplink control channel of at least one slot, the UE feeds back a bit combination with a predefined format on the predefined slot.
Here, the transmission behavior of the ACK/NACK information on the uplink control channel resource of at least one slot is similar to an ACK/NACK feedback mechanism based on channel selection in the LTE system.
In the channel selection mapping table shown in table 1, the DL HARQ buffer overload state is explicitly defined. For example, when the UE is in
Figure BDA0001341229870000142
When the combination of 0bit and 0bit is sent on the resource, the phenomenon of DL HARQ buffer overload occurs on the UE side.
Figure BDA0001341229870000141
TABLE 1
In an implementation manner of the second embodiment of the present invention, the predefined DL HARQ buffer overload state includes: and when the ACK/NACK information is transmitted on the corresponding resource of the uplink control channel of at least one slot, the UE feeds back an abnormal ACK/NACK information format.
And the base station takes the action of feeding back the abnormal ACK/NACK information format on the pre-configured ACK/NACK resource by the UE as a possible DL HARQ buffer overload phenomenon reporting event.
Here, the transmission behavior of the ACK/NACK information on the uplink control channel resource of at least one slot is similar to an ACK/NACK feedback mechanism based on channel selection in the LTE system.
In the channel selection mapping table shown in table 2, the DL HARQ buffer overload state is not defined.
When the UE confirms that the phenomenon of DL HARQ buffer overload occurs, the UE selects a certain abnormal ACK/NACK information format for feedback.
For example, in Table 2, the UE is in
Figure BDA0001341229870000151
The feedback bit combination 1,1 on the resource (denoted as state 1) represents that the UE has received DL data in all the preconfigured 3 DL subframes and can demodulate correctly.
If the base station does not send DL data for the UE in the second subframe configured in advance, the UE should not feed back the state 1.
In this embodiment, if the UE confirms that the DL HARQ buffer overload phenomenon occurs and the UE confirms that DL data is not received in the second subframe configured in advance, the UE selects feedback state 1 in order to indicate that the DL HARQ buffer overload state occurs.
After the base station receives the UE feedback, since the base station determines that the DL data is not sent to the UE in the second subframe configured in advance, the UE should not feed back the state 1 in the normal flow. Therefore, the base station can understand that, in this context, state 1 belongs to an abnormal ACK/NACK information format. The base station further regards the behavior of the abnormal ACK/NACK information format (such as state 1 in this context) fed back by the UE on the pre-configured ACK/NACK resource as a possible DL HARQ buffer overload phenomenon reporting event.
Figure BDA0001341229870000152
TABLE 2
In an implementation manner of the second embodiment of the present invention, the method further includes: after the UE feeds back the predefined DL HARQ buffer overload state on the pre-configured acknowledgement information ACK/NACK resource, the UE receives the scheduling of the base station according to a first scheduling signaling sent by the base station, and the UE reports first information. In other words, after receiving that the UE feeds back the predefined DL HARQ buffer overload status on the preconfigured ACK/NACK resource, the base station schedules the UE to feed back the first information through the first scheduling signaling, where the first information includes: at least one of DL HARQ buffer overload phenomenon confirmation information, ACK/NACK feedback information of all or part of HARQ processes, and HARQ process number updating reporting information which can be supported by the UE to the maximum.
In an implementation manner of the second embodiment of the present invention, the updating of the report information by the maximum number of HARQ processes that can be supported by the UE means that the UE notifies the base station to update the maximum number of HARQ processes that can be supported by the UE.
In an implementation manner of the second embodiment of the present invention, after receiving the first scheduling signaling, the UE may report the first information.
In an implementation manner of the second embodiment of the present invention, the method further includes: after the UE feeds back the predefined DL HARQ buffer overload state on the pre-configured acknowledgement information ACK/NACK resource, the UE expects to receive a first scheduling signaling sent by a base station in a first time window. Note that after the UE feeds back the predefined DL HARQ buffer overload status on the preconfigured ACK/NACK resource, the UE may prepare the first information fed back later in advance without waiting for the first scheduling signaling, so as to shorten the time interval between the time of reporting the DL HARQ buffer overload status and the time of feeding back the first information later.
A computer-readable storage medium of an embodiment of the invention, on which a computer program is stored, is characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any of the above embodiments.
A terminal according to an embodiment of the present invention includes: a memory for storing a computer program capable of running on the processor; and a processor for performing the steps of the method according to any one of the preceding embodiments when the computer program is run.
A terminal according to an embodiment of the present invention includes:
an overload determining unit, configured to determine that the DL HARQ buffer is overloaded;
and the feedback unit is used for feeding back the overload state of the predefined DL HARQ buffer area on the pre-configured ACK/NACK resources.
In an embodiment of the present invention, the predefined DL HARQ buffer overload state includes: and the UE does not feed back ACK/NACK information on the pre-configured ACK/NACK resources.
In an embodiment of the present invention, the predefined DL HARQ buffer overload state includes: and the UE feeds back a bit combination with a predefined format on the pre-configured ACK/NACK resource.
In an embodiment of the present invention, the predefined DL HARQ buffer overload state includes: and when the ACK/NACK information is transmitted on the corresponding resource of the uplink control channel of at least one slot, the UE feeds back a bit combination with a predefined format on the predefined slot.
In an embodiment of the present invention, the predefined DL HARQ buffer overload state includes: and when the ACK/NACK information is transmitted on the corresponding resource of the uplink control channel of at least one slot, the UE feeds back an abnormal ACK/NACK information format.
In an implementation manner of the embodiment of the present invention, the method further includes: after the UE feeds back a predefined DL HARQ buffer overload state on a pre-configured acknowledgement information ACK/NACK resource, the UE receives the scheduling of the base station according to a first scheduling signaling sent by the base station; the UE reports first information;
in an implementation manner of the embodiment of the present invention, the first information includes: at least one of DL HARQ buffer overload phenomenon confirmation information, ACK/NACK feedback information of all or part of HARQ processes and HARQ process number updating reporting information which can be supported by the UE to the maximum.
In an implementation manner of the embodiment of the present invention, the method further includes: after the UE feeds back the predefined DL HARQ buffer overload status on the pre-configured ACK/NACK resources,
the UE expects to receive a first scheduling signaling sent by a base station in a first time window.
The integrated module according to the embodiment of the present invention may also be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as an independent product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
Correspondingly, the embodiment of the present invention further provides a computer storage medium, in which a computer program is stored, where the computer program is used to execute the processing method for UE overload according to the embodiment of the present invention.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (12)

1. A method for processing terminal overload is characterized in that the method comprises the following steps:
a terminal UE receives a base station configuration signaling;
the UE reports the size of a DLHARQ buffer according to the scheduling of the base station configuration signaling;
the method further comprises the following steps:
the UE receives the scheduling of the base station according to the estimated use condition of the DL HARQ buffer area by the base station;
the service condition of the base station for estimating the DL HARQ buffer is specifically realized by the following formula:
m+α×n；
wherein m is the bit number of all NACK process caches; alpha is a ratio coefficient of values in the interval of [0, 1 ]; n is the number of buffered bits of all processes which have not fed back ACK/NACK.
2. The method of claim 1, wherein reporting the DL HARQ buffer size by the UE comprises:
and the UE reports the DL HARQ buffer area size as an attribute of the UE capability of the UE to a base station.
3. A method for processing terminal overload is characterized in that the method comprises the following steps:
a base station issues a base station configuration signaling;
the base station schedules the terminal UE according to the base station configuration signaling;
the base station receives the size of a downlink hybrid automatic repeat request (DL HARQ) buffer area reported by the UE after responding to the scheduling;
the method further comprises the following steps:
when the base station executes the scheduling, the service condition of a DL HARQ buffer area at the UE side is estimated;
scheduling the UE based on the estimated use condition of the DL HARQ buffer at the UE side;
the estimating of the use condition of the DL HARQ buffer at the UE side is specifically realized by the following formula:
m+α×n；
wherein m is the bit number of all NACK process caches; alpha is a ratio coefficient of values in the interval of [0, 1 ]; n is the number of buffered bits of all processes which have not fed back ACK/NACK.
4. The method of claim 3, further comprising:
the base station determines the maximum schedulable new transmission data based on the size of the DL HARQ buffer and the estimated use condition of the DL HARQ buffer, and the method is specifically realized by the following formula:
X＝Y-Y1；
wherein X is newly transmitted data which can be scheduled maximally; y is DL HARQ buffer size; y1 is the usage of DL HARQ buffer prediction.
5. A method for processing terminal overload is characterized in that the method comprises the following steps:
the terminal UE determines that the DL HARQ buffer area is overloaded;
the UE feeds back a predefined DLHARQ buffer overload state on a pre-configured ACK/NACK resource;
the method further comprises the following steps: after the UE feeds back the predefined DL HARQ buffer overload status on the pre-configured ACK/NACK resources,
the UE receives the scheduling of the base station according to a first scheduling signaling sent by the base station;
the UE reports first information;
the first information includes: at least one of DL HARQ buffer overload phenomenon confirmation information, ACK/NACK feedback information of all or part of HARQ processes and HARQ process number updating reporting information which can be supported by the UE to the maximum.
6. The method of claim 5, wherein the predefined DL HARQ buffer overload status comprises:
and the UE does not feed back ACK/NACK information on the pre-configured ACK/NACK resources.
7. The method of claim 5, wherein the predefined DL HARQ buffer overload status comprises:
and the UE feeds back a bit combination with a predefined format on the pre-configured ACK/NACK resource.
8. The method of claim 5, wherein the predefined DL HARQ buffer overload status comprises:
and when the ACK/NACK information is transmitted on the corresponding resource of the uplink control channel of at least one slot, the UE feeds back a bit combination with a predefined format on the predefined slot.
9. The method of claim 5, wherein the predefined DL HARQ buffer overload status comprises:
and when the ACK/NACK information is transmitted on the corresponding resource of the uplink control channel of at least one slot, the UE feeds back an abnormal ACK/NACK information format.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 2, or according to any one of claims 3 to 4, or according to any one of claims 5 to 9.
11. A terminal, characterized in that the terminal comprises:
a memory for storing a computer program capable of running on the processor;
a processor for performing the steps of the method according to any one of claims 1 to 2 or 5 to 9 when running the computer program.
12. A base station, characterized in that the base station comprises:
a memory for storing a computer program capable of running on the processor;
a processor for performing the steps of the method according to any one of claims 3 to 4 when running the computer program.
CN201710538425.1A 2017-07-04 2017-07-04 Terminal overload processing method, terminal, base station and computer storage medium Active CN109217991B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710538425.1A CN109217991B (en) 2017-07-04 2017-07-04 Terminal overload processing method, terminal, base station and computer storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710538425.1A CN109217991B (en) 2017-07-04 2017-07-04 Terminal overload processing method, terminal, base station and computer storage medium

Publications (2)

Publication Number Publication Date
CN109217991A CN109217991A (en) 2019-01-15
CN109217991B true CN109217991B (en) 2021-10-26

Family

ID=64992830

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710538425.1A Active CN109217991B (en) 2017-07-04 2017-07-04 Terminal overload processing method, terminal, base station and computer storage medium

Country Status (1)

Country Link
CN (1) CN109217991B (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1972177A (en) * 2006-11-29 2007-05-30 北京邮电大学 Method of jointly fixing automatic request retransmission and scheduling algorithm based on terminal feedback
CN101237241A (en) * 2007-01-31 2008-08-06 大唐移动通信设备有限公司 A method and system for realizing mixed automatic request re-transfer processing and channel decoding
CN101388756A (en) * 2007-09-11 2009-03-18 大唐移动通信设备有限公司 Data package transmission method and apparatus
CN101494530A (en) * 2008-01-21 2009-07-29 中兴通讯股份有限公司 Method for distributing and using mixing automatic retransmission request data outburst buffer zone
CN101795185A (en) * 2004-11-03 2010-08-04 三星电子株式会社 In broadband wireless access communication system using multi, be used to launch/system and method for receiving hybrid automatic repeat request buffer capability information
CN101932019A (en) * 2009-06-19 2010-12-29 中兴通讯股份有限公司 Method, terminal and network system for reporting buffer status report
CN102461049A (en) * 2009-04-28 2012-05-16 英特尔公司 Harq buffer management and feedback design for a wireless system
CN102549959A (en) * 2009-09-16 2012-07-04 英特尔公司 Method and system to increase the throughput of a hybrid automatic repeat request (HARQ) protocol
CN104349461A (en) * 2013-07-26 2015-02-11 电信科学技术研究院 BSR reporting method, uplink resource allocation method and equipment thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101795185A (en) * 2004-11-03 2010-08-04 三星电子株式会社 In broadband wireless access communication system using multi, be used to launch/system and method for receiving hybrid automatic repeat request buffer capability information
CN1972177A (en) * 2006-11-29 2007-05-30 北京邮电大学 Method of jointly fixing automatic request retransmission and scheduling algorithm based on terminal feedback
CN101237241A (en) * 2007-01-31 2008-08-06 大唐移动通信设备有限公司 A method and system for realizing mixed automatic request re-transfer processing and channel decoding
CN101388756A (en) * 2007-09-11 2009-03-18 大唐移动通信设备有限公司 Data package transmission method and apparatus
CN101494530A (en) * 2008-01-21 2009-07-29 中兴通讯股份有限公司 Method for distributing and using mixing automatic retransmission request data outburst buffer zone
CN102461049A (en) * 2009-04-28 2012-05-16 英特尔公司 Harq buffer management and feedback design for a wireless system
CN101932019A (en) * 2009-06-19 2010-12-29 中兴通讯股份有限公司 Method, terminal and network system for reporting buffer status report
CN102549959A (en) * 2009-09-16 2012-07-04 英特尔公司 Method and system to increase the throughput of a hybrid automatic repeat request (HARQ) protocol
CN104349461A (en) * 2013-07-26 2015-02-11 电信科学技术研究院 BSR reporting method, uplink resource allocation method and equipment thereof

Also Published As

Publication number Publication date
CN109217991A (en) 2019-01-15

Similar Documents

Publication Publication Date Title
US10727982B2 (en) Controlling communication of data between devices supporting multiple retransmission protocol processes
EP2286537B1 (en) Increasing reliability of hybrid automatic repeat request protocol
US9532352B2 (en) Method and apparatus for incremental-redundancy HARQ process
JP5420769B2 (en) Method and apparatus for avoiding mobile station transmission of duplicate event-based polled acknowledgments
CN101843026B (en) Methods and apparatus for processing error control messages in wireless communication system
EP2567482B1 (en) Method and system of transfering data in a carrier aggregation environment
JP4473317B2 (en) Cognitive flow control based on channel quality conditions
EP2165449B1 (en) Semi-persistent resource allocation method for uplink transmission in wireless packet data systems
EP2340630B1 (en) Efficient transmission and reception of feedback data and user data
EP2168385B1 (en) Avoiding collisions between semi-persistent allocation and dynamic allocation in radio access networks
KR20200021542A (en) Communication devices, systems, and methods for communication using feedback
JP2011517150A (en) Control of data transmission based on HARQ in a wireless communication system
EP2341685A1 (en) Method and apparatus for scheduling an acknowledgement in a wireless communication system
CN108886436B (en) Radio network node, wireless device and methods performed therein
JP2008547344A (en) Apparatus and method for H-ARQ in a wireless communication system
CN101366194A (en) Device and method in mobile communication network
CN111193578A (en) Method and system for triggering HARQ-ACK feedback information and method and system for sending HARQ-ACK feedback information
US20110151883A1 (en) Method for communicating in a network, a secondary station and a system therefor
JP2009004890A (en) Retransmission control method and controller
EP3378178B1 (en) Toggling based indicator of reception success
CN109217991B (en) Terminal overload processing method, terminal, base station and computer storage medium
JP4906750B2 (en) Mobile station and communication control method
WO2018191863A1 (en) Method and device for data transmission
CN111213410A (en) Indicating UE capability with short TTI
WO2022082748A1 (en) Hybrid automatic repeat request method, semi-persistent scheduling method, and communication apparatus

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant