CN102055571B - Transmission method of data packets, communication equipment and communication system - Google Patents
Transmission method of data packets, communication equipment and communication system Download PDFInfo
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Abstract
The invention discloses a transmission method of data packets, communication equipment and a communication system. The transmission method is characterized in that the current scheduling window length is regulated in accordance with the number of data packets to be sent and previously received feedback information; transmitting the data packets in accordance with the regulated scheduling window length, so that the scheduling window length can vary with the wireless channel quality, i.e., when the wireless channel quality is good, the scheduling window length is increased to save wireless resources, and when the wireless channel quality is poor, the scheduling window length is reduced to avoid repeatedly transmitting a group of data packets, thus reducing the transmission delay and realizing the purpose of effectively utilizing the wireless resources.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data packet transmission method, a communication device, and a communication system.
Background
Hybrid automatic repeat Request (HARQ) adopts an Error control method based on Forward Error Correction (FEC) and automatic repeat Request (ARQ) to reduce the Error rate of the system to ensure the quality of service.
Common HARQ protocols include stop-and-wait, back-off N-step, and selective repeat. In these three protocols, each data packet needs to be fed back with an Acknowledgement (ACK) or a Negative Acknowledgement (NACK), and in order to save radio resources, the prior art proposes to feed back a plurality of data packets with one ACK or NACK.
For example, in a Long Term evolution time Division Duplex (LTE TDD) system in the prior art, the length of a scheduling window may be 1, 2, 3, or 4 subframes, that is, data packets in 1, 2, 3, or 4 subframes correspond to one ACK or NACK feedback, where ACK or NACK information corresponding to data packets in one or more subframes may be sent in a bundling or multiplexing (multiplexing) manner, and in ACK or NACK bundling, ACK or NACK feedback corresponding to multiple subframes forms ACK or NACK information with a size of 1bit (bit) through logic and operation for transmission; in ACK or NACK multiplexing, an ACK or NACK feedback contains information of size N or 2N bits (bits), where N is the number of subframes in a scheduling window. The feedback time of the ACK or NACK of the uplink and downlink data packets is fixed and is determined by different TDD uplink and downlink proportions.
In the course of research and practice on the prior art, the inventors of the present invention found that, in the prior art, the size of the scheduling window is fixed or specified, and ACK/NACK feeds back each data packet or an ACK or NACK feeds back a group of data packets in the scheduling window in a bundled or multiplexed manner, neither the former nor the latter considers the influence of the quality of the wireless channel on the retransmission of the data packet feedback, which also leads to a problem: if the former scheme is adopted, when the wireless channel quality is good, the success rate of data packet transmission is very high, so that if each data packet is required to be fed back by ACK or NACK once, the wireless resources are wasted, and if the latter scheme is adopted, when the channel quality is poor, because the error rate of data packet transmission is very high, if a plurality of data packets are fed back by ACK or NACK again, the repeated retransmission of a group of data packets may be caused, thereby causing the increase of transmission delay, that is, the prior art cannot effectively utilize the wireless resources.
Disclosure of Invention
Embodiments of the present invention provide a data packet transmission method, a communication device, and a communication system, so that the length of a scheduling window can be adaptively adjusted along with the change of the quality of a wireless channel, thereby achieving the purpose of effectively utilizing wireless resources.
A method for transmitting a data packet, comprising:
adjusting the length of a current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, wherein the length of the scheduling window is greater than or equal to the minimum unit of the length of one scheduling window and less than or equal to the maximum length of the scheduling window;
and transmitting the data packet according to the adjusted length of the scheduling window.
A communication device, comprising:
the adjusting unit is used for adjusting the length of the current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, wherein the length of the scheduling window is more than or equal to the minimum unit of the length of one scheduling window and less than or equal to the length of the maximum scheduling window;
and the transmission unit is used for transmitting the data packet according to the length of the scheduling window adjusted by the adjusting unit.
A communication system, comprising:
the sending end communication equipment is used for adjusting the length of a current scheduling window according to the number of data packets waiting to be sent and feedback information sent by the receiving end communication equipment received last time, wherein the length of the scheduling window is more than or equal to the minimum unit of the length of one scheduling window and less than or equal to the maximum scheduling window length, and the data packets are sent to the receiving end communication equipment according to the adjusted length of the scheduling window;
and the receiving end communication equipment is used for receiving the data packet sent by the sending end communication equipment and sending the feedback message to the sending end communication equipment.
The embodiment of the invention adjusts the length of the current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, and then transmits the data packets according to the adjusted length of the scheduling window, so that the length of the scheduling window can be changed along with the change of the quality of a wireless channel, namely, when the quality of the wireless channel is good, the length of the scheduling window is increased to save wireless resources, and when the quality of the wireless channel is poor, the length of the scheduling window is reduced to avoid the repeated retransmission of a group of data packets, and the transmission delay is reduced, thereby realizing the purpose of effectively utilizing the wireless resources.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method provided in one embodiment of the present invention;
fig. 2 is a schematic diagram illustrating adjustment of the length of the scheduling window in the method according to the embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the adjustment of the length of the scheduling window when all data packets in the scheduling window are retransmitted in an error manner according to the embodiment of the present invention;
fig. 4 is a schematic diagram illustrating adjustment of the length of the uplink scheduling window when all data packets after an erroneous data packet in the erroneous scheduling window are retransmitted in the method according to the embodiment of the present invention;
fig. 5 is a schematic diagram illustrating adjustment of the length of the downlink scheduling window when all data packets after an erroneous data packet in the erroneous scheduling window are retransmitted in the method according to the embodiment of the present invention;
fig. 6 is a schematic diagram illustrating adjustment of the length of the downlink scheduling window during retransmission of an erroneous data packet in the erroneous scheduling window in the method according to the embodiment of the present invention;
fig. 7 is a schematic structural diagram of a communication device provided in an embodiment of the present invention;
fig. 8 is another schematic structural diagram of a communication device provided in an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a data packet transmission method, communication equipment and a communication system. The following are detailed below.
The first embodiment,
A method for transmitting a data packet, comprising: adjusting the length of a current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, and transmitting the data packets according to the adjusted length of the scheduling window; the length of the scheduling window is greater than or equal to the minimum unit of the length of one scheduling window and less than or equal to the length of the maximum scheduling window. As shown in fig. 1, the specific process is as follows:
101. adjusting the length of a current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, wherein the length of the scheduling window is more than or equal to 1 and less than or equal to the length of the maximum scheduling window; where 1 refers to a minimum unit of a scheduling window length, such as a subframe or frame, etc. For example:
if the last received feedback information is an ACK message, rounding up the quotient of the number of data packets to be transmitted and the number of data packets transmitted in the minimum unit of each scheduling window length to obtain a first numerical value, adding at least one minimum unit of the scheduling window length to the current scheduling window length to obtain a second numerical value, for example, adding 1 to the number of continuously transmitted subframes/frames in the current scheduling window length to obtain a second numerical value, and taking the minimum value of the first numerical value and the second numerical value as the adjusted scheduling window length;
if the last received feedback information is a NACK message, rounding up the quotient of the number of data packets to be transmitted and the number of data packets transmitted in the minimum unit of each scheduling window length to obtain a first numerical value, reducing the current scheduling window length by at least one minimum unit of the scheduling window length to obtain a third numerical value, for example, halving the number of continuously transmitted subframes/frames in the current scheduling window length to obtain a third numerical value, and taking the minimum value of the first numerical value and the third numerical value as the adjusted scheduling window length.
Wherein, rounding up a certain number means taking the first integer greater than or equal to the number, for example, if rounding up 4.2, the number obtained is 5, and if rounding up 4, the number obtained is 4; similarly, rounding a number down refers to taking the first integer less than or equal to the number, e.g., rounding down to 4.7 would result in a number of 4, rounding down to 4 would result in a number of 4, and so on.
The following examples are described in further detail as follows:
assuming that the minimum unit of the length of the scheduling window is a subframe or a frame, L (more than or equal to 1) data packets can be transmitted in each subframe or frame, the number of consecutive subframes (or frames) in the scheduling window at the previous time is W (n), the number of data packets to be transmitted is m, the number of consecutive subframes (or frames) in the next scheduling window is W (n +1), and the length of the maximum scheduling window is Wmax(t), then:
if the feedback information is an ACK message
If the feedback information is a NACK message, then
Wherein, 1. ltoreq. W (n). ltoreq.Wmax(t), after reaching the minimum scheduling window 1, if still receiving the NACK information, keeping the length of the scheduling window at the moment as 1; similarly, when the maximum scheduling window W is reachedmaxAfter (t), if ACK information is still received, keeping the length of the scheduling window at the moment as Wmax(t)。
Wherein the maximum scheduling window length Wmax(t) can be determined according to the following method, as follows:
(1) acquiring a current Channel Quality Indicator (CQI);
for example, a current channel quality indication sample point reported by a receiving terminal performs weighted average on the received current channel quality indication sample point to obtain a current channel quality indication; or,
and receiving a current channel quality indicator reported by the terminal, wherein the current channel quality indicator is obtained by the terminal by performing weighted average on a measured current channel quality indicator sample point.
The following were used:
assuming that the length of the weighted-average current channel quality indicator sample point is K, the weighted-average channel quality indicator is: p (n) ═ aK-1p(n-K+1)+aK-2p(n-K+2)+...+a0p(n)
Where p (n-K), K-1, K-2, 0 is K channel quality indicator sample points, p (n) is the current channel quality indicator obtained after weighted averaging, aK-1，aK-2...a0As the weighting coefficient, the weighting coefficient satisfies aK-1+aK-2+...+a0＝1。
(2) Determining the length of the current maximum scheduling window according to the current channel quality indication;
for example, the corresponding relation table between the channel quality indicator and the maximum scheduling window length maintained by the base station is searched according to the current channel quality indicator, and the current maximum scheduling window length is determined.
That is, if the channel changes slowly or substantially constantly during a period of time, the maximum scheduling window length is fixed and constant, and when the channel quality indicates that the current channel has changed greatly from before, the updated maximum scheduling window length can be obtained by table lookup.
102. Transmitting the data packet according to the adjusted length of the scheduling window; for example:
and if the last received feedback information is an ACK message, transmitting a new data packet according to the adjusted scheduling window length.
If the last received feedback information is a NACK message, retransmitting the data packet according to the adjusted scheduling window length, for example, retransmitting in any one of the following manners:
(1) retransmitting all data packets within the error scheduling window length according to the adjusted scheduling window length;
(2) and retransmitting the first error data packet in the error scheduling window length and all data packets behind the error data packet according to the adjusted scheduling window length, wherein the NACK message needs to carry an error data packet identifier, so that the error data packet can be determined according to the error data packet identifier.
(3) And retransmitting error data packets in the error scheduling window length according to the adjusted scheduling window length, wherein the NACK message needs to carry error data packet identification, so that the error data packets can be determined according to the error data packet identification.
It should be noted that, in the embodiment of the present invention, the adjustment range for the length of the scheduling window is as follows: it should be understood that, in the specific implementation, the adjustment range of the scheduling window length may be determined according to a preset strategy.
As can be seen from the above, in the embodiment, the length of the current scheduling window is adjusted according to the number of data packets waiting to be sent and the feedback information received last time, and then the data packets are transmitted according to the adjusted length of the scheduling window, so that the length of the scheduling window can be changed along with the change of the quality of the wireless channel, that is, when the quality of the wireless channel is good, the length of the scheduling window is increased to save wireless resources, and when the quality of the wireless channel is poor, the length of the scheduling window is decreased to avoid the repeated retransmission of a group of data packets, and the transmission delay is decreased, thereby achieving the purpose of effectively utilizing the wireless resources.
Example II,
This embodiment will be described in further detail by way of example according to the method described in embodiment one.
First, it is necessary to maintain an uplink and downlink channel quality indicator and a maximum scheduling window length W at the base station sidemaxAnd (t) the corresponding relation table enables the uplink and the downlink to dynamically select the maximum scheduling window length according to the current channel quality. The maximum scheduling window length W if the channel changes slowly or substantially unchanged over a period of timemax(t) fixed; if the channel quality indication shows that the current channel quality is greatly changed compared with the previous channel quality, searching a corresponding relation table according to the channel quality indication to obtain the updated maximum scheduling window length Wmax(t)。
And secondly, synchronous ACK/NACK feedback is adopted for the uplink and the downlink, namely, the feedback information is sent after a fixed time delay after a scheduling window. The length of each scheduling window may be adaptively adjusted according to the number m of data packets waiting to be transmitted and a linear Increase exponential Decrease (AIMD) manner, that is, according to the number of data packets waiting to be transmitted and the last received feedback information, for example:
assuming that L (more than or equal to 1) data packets can be transmitted in each subframe (or frame), the number of consecutive subframes (or frames) in the scheduling window at the previous time is w (n), the number of data packets to be transmitted is m, and the number of consecutive subframes (or frames) in the next scheduling window is w (n +1), then:
if the feedback information is an ACK message, the number of continuously transmitted sub-frames or the number of frames in the scheduling window may be added by 1 to be used as a second value, and the number of data packets waiting to be transmitted and each sub-frame may be addedThe quotient of the number of data packets sent in the frame is rounded up to be used as a first numerical value, the minimum value of the first numerical value and the second numerical value is used as the length of the adjusted scheduling window, and the length is expressed by a formula:
if the feedback information is NACK message, the number of subframes or frames continuously transmitted in the scheduling window may be halved and rounded down as a third value, the quotient of the number of packets waiting to be transmitted and the number of packets transmitted in each subframe/frame is rounded up as a first value, and the minimum value of the first value and the third value is taken as the adjusted scheduling window length, which is expressed by a formula:
wherein, the length of the scheduling window is more than or equal to 1 and less than or equal to the maximum scheduling window length, namely, W is more than or equal to 1 and less than or equal to W (n)max(t) wherein 1 and Wmax(t) are the minimum and maximum number of consecutive transmission subframes (or frames) in the current scheduling window, respectively. After the minimum scheduling window length 1 is reached, if NACK feedback is still received, the scheduling window length is kept to be 1; similarly, when the maximum scheduling window length W is reachedmaxAfter (t), if ACK feedback is still received, keeping the length of the scheduling window as Wmax(t)。
Fig. 2 is a schematic diagram illustrating the adjustment of the length of the scheduling window, which shows the process of dynamically adjusting the length of the scheduling window according to the ACK message or the NACK message when the transmitting end always has data packets to transmit: after receiving the ACK message, the sending end adds 1 to the next scheduling window length, otherwise, if receiving the NACK message, the length of the scheduling window is halved, where D in fig. 2 represents a data packet subframe or frame.
As will be exemplified below.
Maximum scheduling window length Wmax(t) adaptive adjustment
(1) Downlink transmission
In a downlink transmission process, a terminal measures a downlink pilot signal to obtain downlink channel quality, and periodically or aperiodically reports the measurement result to a base station, where the reported measurement result may be a current channel quality indication obtained by direct measurement, or a channel quality indication obtained by performing weighted average on a current channel quality indication sample point obtained by measurement at a terminal side, and if the reported measurement result is the current channel quality indication, the terminal side needs to perform weighted average according to a previously received channel quality indication sample point.
Assuming that the length of the sample point of the weighted average is K, the channel quality indicator after weighted average is shown as follows:
p(n)＝aK-1p(n-K+1)+aK-2p(n-K+2)+...+a0p(n)
where p (n-K), K-1, K-2, 0 is K channel quality indicator sample points, p (n) is the current channel quality indicator obtained after weighted averaging, aK-1，aK-2...a0As the weighting coefficient, the weighting coefficient should satisfy aK-1+aK-2+...+a0＝1。
After obtaining the weighted-average channel quality indicator, the base station can search the channel quality indicator and the maximum scheduling window length W according to the weighted-average channel quality indicatormaxAnd (t) obtaining the maximum scheduling window length which should be adopted by the current downlink.
(2) Uplink transmission
In an uplink transmission process, a base station measures an uplink pilot signal sent by a terminal side, obtains an uplink channel quality indicator after weighted average in the same way as a downlink, and then searches 'the channel quality indicator and the maximum scheduling window length W' according to the uplink channel quality indicator after weighted averagemaxThe correspondence table "obtains the maximum scheduling window length that should be used for the current uplink, which may specifically refer to the description in the downlink transmission, and is not described herein again.
(II) adaptive adjustment of scheduling window
In the downlink transmission process, the base station adjusts the length of the current scheduling window by waiting for the number of data packets to be sent and the feedback information received last time, such as ACK (acknowledgement) message or NACK (negative acknowledgement) message real-time information;
in the uplink transmission process, the terminal adjusts the length of the current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, such as ACK (acknowledgement) message or NACK (negative acknowledgement) message real-time information, then requests uplink resources from the base station, and then the base station allocates the number of continuous uplink transmission subframes or frames to the terminal, wherein the value cannot exceed the length of the current maximum scheduling window.
Three feedback retransmission schemes will be described below respectively according to different feedback retransmission mechanisms. In the schemes, the minimum scheduling unit is assumed to be a subframe, the processing delay for feeding back the ACK message or the NACK message after the scheduling window is fixed to one subframe, and meanwhile, it is assumed that one data packet can be transmitted in each subframe. It should be noted that, in practical applications, if multiple data packets are scheduled in one subframe at the same time, error retransmission can be performed by respectively identifying each data packet, which may specifically refer to the prior art and is not described herein again.
(1) Retransmitting all data packets in the error scheduling window
As shown in fig. 3, ACK messages or NACK messages are fed back with 1bit, downlink ACK messages or NACK messages distinguish different transmitting ends by a bitmap or different orthogonal codes, and uplink ACK messages or NACK messages distinguish different receiving ends by using different resource regions or different orthogonal codes.
After receiving the data packets sent by the sending end, the receiving end decodes and caches each data packet, and when all the data packets are received completely, if no error data packet is found, the ACK message is fed back after processing delay, that is, in this embodiment, the ACK message is fed back after a subframe is left behind a scheduling window, and after receiving the ACK message, the sending end adjusts the length of the scheduling window to send a new data packet.
If the receiving end detects that the transmission error occurs in the data packet with error, such as the data packet 4 in fig. 3, the receiving end feeds back a NACK message. Because the NACK message has only 1bit size and is not enough to indicate an error data packet, the sending end needs to adjust the length of the scheduling window to retransmit all data packets in the error scheduling window after receiving the NACK message, and then a group of data packets originally sent in one scheduling window may not be transmitted in the same scheduling window due to the change of the scheduling window.
For example, as shown in fig. 3, after receiving NACK, the transmitting end adjusts the length of the scheduling window, and decreases the length of the scheduling window from w (n +1) ═ 3 to w (n +2) ═ 1, then a set of packets 3, 4, and 5 that were originally continuously transmitted will be transmitted in two scheduling windows w (n +2) and w (n +3), respectively, that is, the packet 3 is transmitted in the scheduling window w (n +2), and the packets 4 and 5 are transmitted in the scheduling window w (n + 3). And after the retransmission is finished, continuing to transmit the new data packet.
(2) Retransmitting the first error data packet in the error scheduling window and the data packet after the error data packet
Unlike the scheme (1) in which all data packets in the scheduling window are retransmitted, in the scheme (2), if the receiving end detects the first erroneous data packet, the receiving end immediately stops receiving the subsequent data packets, and simultaneously feeds back a NACK message after processing the delay, and the NACK message carries the identifier of the first erroneous data packet. After receiving the NACK message, the sending end stops sending the data packet that has not been completed, obtains the identification of the data packet with error from the received NACK message, adjusts the length of the scheduling window (the specific adjustment method can refer to the foregoing description), retransmits all the first data packet with error in the scheduling window with error and the data packet after the data packet with error, and continues sending the new data packet after the retransmission is completed.
Since the error feedback may occur anywhere within a scheduling window, a real-time allocation of feedback resources is used for the uplink NACK message and the downlink NACK message. The following were used:
downlink NACK message: different terminals are distinguished through a group of orthogonal codes, if an error data packet is detected, downlink resources are allocated to downlink NACK messages in real time by the base station, and error data packet identifications of the different terminals are modulated through different orthogonal code sequences and then fed back to the terminals in the form of NACK information. As shown in fig. 4, the original uplink scheduling window is w (n) ═ 6, the base station detects the error data packet 2 in the second subframe, and after the processing delay of one subframe, feeds back the NACK message carrying the identifier of the error data packet to the terminal in the fourth subframe. And after receiving the NACK message, the terminal stops transmitting the data packet in the original scheduling window, readjusts the length of the scheduling window to be w (n +1) to be 3, and retransmits the error data packet from the error data packet, namely the data packet 2 and transmits the data packet which is not transmitted completely.
Uplink NACK message: referring to fig. 5, an original uplink scheduling window is w (n) ═ 5, the terminal detects an error data packet in a second subframe, for example, after detecting that a data packet 2 has an error, the terminal requests uplink resources from the base station in a fourth subframe through processing delay of one subframe, and sends a NACK message carrying an error data packet identifier to the base station in a sixth subframe through processing delay of one subframe, the base station stops sending the data packet in the original scheduling window after receiving the NACK message, readjusts the length of the scheduling window to w (n +1) ═ 2, and starts to retransmit the error data packet from the error data packet, that is, the data packet 2, and sends the data packet that is not sent. Compared with the downlink, the uplink NACK message can be fed back only after requesting uplink resources, so that a resource request delay is introduced.
If there is no transmission error, the ACK message is fed back after the processing delay.
(3) Retransmitting faulty data packets within a faulty scheduling window
In the scheme (3), the feedback information is sent after the end of the scheduling window, if no error data packet is detected, an ACK message is fed back, and if an error data packet is detected, a NACK message is fed back, wherein the NACK message needs to carry all data packet identifiers with errors in transmission.
Referring to fig. 6, an original uplink scheduling window is w (n) ═ 4, after a receiving end receives all data packets 1, 2, 3, and 4 in the scheduling window, it detects that a data packet 3 is in error, so that the receiving end feeds back a NACK message carrying an error data packet identifier to a sending end after a processing delay of a subframe, after the sending end receives the NACK message, it obtains all error data packet identifiers, the sending end adjusts the length of the next scheduling window to w (n) ═ 2, and then performs error data packet retransmission and new data packet transmission according to the adjusted length of the scheduling window, that is, retransmits the data packet 3 and sends a new data packet 5.
It should be noted that, because only the error data packet is retransmitted at this time, the receiving end needs to reorder the retransmitted data packet and the buffered data packet, which are received successfully, and then send the reordered data packet to the upper layer for processing; in addition, the base station may allocate a resource feedback NACK message to each terminal in uplink or downlink, so that different data packet identifiers may be distinguished at the transmitting end and the receiving end through a bitmap or different orthogonal code sequences, which may be referred to in the prior art specifically and is not described herein again.
It should be further noted that the sending end in the embodiment of the present invention may be a terminal or a base station, and the receiving end may also be a terminal or a base station, for example, when performing uplink transmission, the sending end is a terminal and the receiving end is a base station, and when performing downlink transmission, the sending end is a base station and the receiving end is a terminal.
As can be seen from the above, in the embodiment, a corresponding relation table between the channel quality indicator and the maximum scheduling window length is maintained at the base station side, and after the current channel quality indicator is obtained, the maximum scheduling window length is determined by looking up the table, so that a larger maximum scheduling window length can be adopted when the channel quality is good and a smaller maximum scheduling window length can be adopted when the channel quality is poor, and then the scheduling window is adjusted in real time within the maximum scheduling window length range according to the channel quality to effectively utilize the wireless resources;
during specific implementation, the length of the current scheduling window can be adjusted according to the number of data packets waiting for transmission and the feedback information received last time, and then the data packets are transmitted according to the adjusted length of the scheduling window, so that the length of the scheduling window can be changed along with the change of the quality of the wireless channel, namely when the quality of the wireless channel is good, the length of the scheduling window is increased to save wireless resources, when the quality of the wireless channel is poor, the length of the scheduling window is reduced to avoid repeated retransmission of a group of data packets, and transmission delay is reduced, thereby achieving the purpose of effectively utilizing the wireless resources.
Example III,
In order to better implement the above method, an embodiment of the present invention further provides a communication device accordingly, as shown in fig. 7, the communication device includes an adjusting unit 301 and a transmitting unit 302;
an adjusting unit 301, configured to adjust a length of a current scheduling window according to the number of data packets waiting to be sent and feedback information received last time, where the length of the scheduling window is greater than or equal to a minimum unit of the length of the scheduling window and less than or equal to a maximum length of the scheduling window;
a transmission unit 302, configured to transmit a data packet according to the scheduling window length adjusted by the adjustment unit 301.
As shown in fig. 7, the communication apparatus may further include an acquisition unit 303 and a determination unit 304;
an obtaining unit 303, configured to obtain a current channel quality indication;
a determining unit 304, configured to determine a current maximum scheduling window length according to the current channel quality indicator obtained by the obtaining unit 303.
In this case, the length of the scheduling window adjusted by the adjusting unit 301 is equal to or greater than the minimum unit of one scheduling window length and equal to or less than the maximum scheduling window length determined by the determining unit 304.
Wherein, the acquiring unit 303 comprises a first receiving subunit 3031 and a first calculating subunit 3032;
a first receiving subunit 3031, configured to receive a current channel quality indication sample point reported by a terminal;
a first calculating sub-unit 3032, configured to perform weighted average on the current channel quality indication sample point received by the first receiving sub-unit 3031, to obtain a current channel quality indication.
Alternatively, as shown in fig. 8, the obtaining unit 303 may specifically be a second receiving subunit 3033;
a second receiving subunit 3033, configured to receive a current channel quality indicator reported by the terminal, where the current channel quality indicator is obtained by the terminal by performing weighted average on a measured sample point of the current channel quality indicator.
At this time, the determining unit 304 is configured to determine the current maximum scheduling window length according to the current channel quality indication calculated by the first calculating subunit 3032 or after the weighted average received by the second receiving subunit 3033.
As shown in fig. 7 and 8, the adjusting unit 301 may further include a first adjusting subunit 3011 and a second adjusting subunit 3012;
a first adjusting subunit 3011, configured to, when the last received feedback information is an ACK acknowledgment message, round up a quotient of the number of packets to be sent and the number of packets sent in the minimum unit of each scheduling window length to obtain a first value, increase the current scheduling window length by at least one minimum unit of the scheduling window length, for example, add 1 to subframes/frames continuously sent in the current scheduling window length to obtain a second value, and take a minimum value of the first value and the second value as the adjusted scheduling window length;
a second adjusting subunit 3012, configured to, when the feedback information received last time is an NACK not acknowledge message, round a quotient of the number of data packets to be sent and the number of data packets sent in the minimum unit of each scheduling window length upwards as a first value, reduce the current scheduling window length by at least one minimum unit of the scheduling window length, for example, reduce the number of subframes/frames continuously sent in the current scheduling window length by half and round the number downwards to obtain a third value, and take the minimum value of the first value and the third value as the adjusted scheduling window length.
In this case, the scheduling window lengths adjusted by the first adjusting unit 3011 and the second adjusting unit 3012 are greater than or equal to 1 and less than or equal to the maximum scheduling window length determined by the determining unit 304, where 1 refers to the minimum unit of one scheduling window length.
As shown in fig. 7 and 8, the transmission unit 302 may include a first transmission subunit 3021 and a second transmission subunit 3022;
a first transmitting subunit 3021, configured to transmit a new data packet according to the length of the scheduling window adjusted by the first adjusting subunit 3011 when the last received feedback information is an ACK message;
a second transmitting subunit 3022, configured to, when the last received feedback information is a NACK message, retransmit all data packets in the length of the error scheduling window according to the length of the scheduling window adjusted by the second adjusting subunit 3012, or retransmit a first error data packet in the length of the error scheduling window and all data packets after the error data packet according to the length of the scheduling window adjusted by the second adjusting subunit 3012, or retransmit an error data packet in the length of the error scheduling window according to the length of the scheduling window adjusted by the second adjusting subunit 3012.
It should be noted that, in the above scheme, if all data packets within the length of the scheduling window with errors are not retransmitted, the NACK message needs to carry an error data packet identifier, so that the error data packet can be determined according to the error data packet identifier.
The communication device may specifically be a base station or a terminal, for example, in uplink transmission, the communication device serving as a sending end may be the terminal, and the communication device serving as a receiving end may be the base station, and in downlink transmission, the communication device serving as the sending end may be the base station, and the communication device serving as the receiving end may be the terminal.
The specific implementation of each unit can refer to the foregoing method embodiments, and is not described herein again.
As can be seen from the above, the adjusting unit 301 in the communication device of this embodiment may adjust the length of the current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, and then the transmitting unit 302 transmits the data packets according to the adjusted length of the scheduling window, so that the length of the scheduling window may change along with the change of the quality of the wireless channel, that is, when the quality of the wireless channel is good, the length of the scheduling window is increased to save wireless resources, and when the quality of the wireless channel is poor, the length of the scheduling window is decreased to avoid the repeated retransmission of a group of data packets, and reduce the transmission delay, thereby achieving the purpose of effectively utilizing the wireless resources.
Example four,
Correspondingly, an embodiment of the present invention further provides a communication system, as shown in fig. 9, the communication system may include a sending-end communication device 401 and a receiving-end communication device 402;
the sending-end communication device 401 is configured to adjust the length of a current scheduling window according to the number of data packets waiting to be sent and feedback information sent by the receiving-end communication device 402 received last time, where the length of the scheduling window is greater than or equal to the minimum unit of the length of one scheduling window and less than or equal to the maximum length of the scheduling window, and send the data packets to the receiving-end communication device 402 according to the adjusted length of the scheduling window;
the receiving-end communication device 402 is configured to receive the data packet sent by the sending-end communication device 401, and send a feedback message to the sending-end communication device 401.
The sending-end communication device 401 is further configured to obtain a current channel quality indicator, and determine a current maximum scheduling window length according to the current channel quality indicator. For example:
the sending end communication equipment 401 receives a current channel quality indication sample point reported by a terminal, performs weighted average on the received current channel quality indication sample point to obtain a current channel quality indication, then searches a corresponding relation table of the channel quality indication and the maximum scheduling window length maintained by a base station according to the current channel quality indication, and determines the current maximum scheduling window length; or,
a sending end communication device 401 receives a current channel quality indication reported by a terminal, searches a corresponding relation table of the channel quality indication and the maximum scheduling window length maintained by a base station according to the current channel quality indication, and determines the current maximum scheduling window length; the current channel quality indication reported by the terminal is obtained by the terminal performing weighted average on the measured current channel quality indication sample points.
The method of weighted average can be specifically referred to the previous embodiment, and is not described herein again.
Specifically, the sending-end communication device 401 is further configured to, when the last received feedback information is an ACK acknowledgment message, round up a quotient of the number of packets to be sent and the number of packets sent in the minimum unit of each scheduling window length to obtain a first value, increase the current scheduling window length by at least one minimum unit of the scheduling window length, for example, add 1 to a number of subframes/frames continuously sent in the current scheduling window length to obtain a second value, and take a minimum value of the first value and the second value as the adjusted scheduling window length; when the last received feedback information is a NACK not confirmed message, rounding up the quotient of the number of data packets to be transmitted and the number of data packets transmitted in the minimum unit of each scheduling window length to a first value, reducing the current scheduling window length by at least one minimum unit of the scheduling window length, for example, rounding down the subframe/frame number continuously transmitted in the current scheduling window length by half to obtain a third value, and taking the minimum value of the first value and the third value as the adjusted scheduling window length. The following were used:
it is assumed that L (≧ 1) data packets can be transmitted in each subframe or frame, the number of consecutive subframes (or frames) in the scheduling window at the previous time is W (n), the number of data packets to be transmitted is m, the number of consecutive subframes (or frames) in the next scheduling window is W (n +1), the maximum scheduling window length is Wmax(t), then:
if the feedback information is an ACK message
If the feedback information is a NACK message, then
Wherein, 1. ltoreq. W (n). ltoreq.Wmax(t), after reaching the minimum scheduling window 1, if still receiving the NACK information, keeping the length of the scheduling window at the moment as 1; similarly, when the maximum scheduling window W is reachedmaxAfter (t), if ACK information is still received, keeping the length of the scheduling window at the moment as Wmax(t)。
Specifically, the sending-end communication device 401 is further configured to transmit a new data packet according to the adjusted scheduling window length when the last received feedback information is an ACK message; retransmitting all data packets in the error scheduling window length according to the adjusted scheduling window length when the last received feedback information is NACK information; or retransmitting the first error data packet in the error scheduling window length and all data packets after the error data packet according to the adjusted scheduling window length, or retransmitting the error data packet in the error scheduling window length according to the adjusted scheduling window length, it should be noted that, in the above scheme, if not retransmitting all data packets in the error scheduling window length, then the NACK message needs to carry the error data packet identifier, so that the error data packet can be determined according to the error data packet identifier, in the latter two retransmission schemes, at this time, in addition to retransmitting the error data packet, a new data packet can also be transmitted in the adjusted scheduling window. For details, reference may be made to embodiment two, which is not described herein again.
The sending-end communication device 401 and the receiving-end communication device 402 may specifically be any one of the communication devices provided in the embodiments of the present invention.
As can be seen from the above, after the sending-end communication device 401 in the communication system of this embodiment obtains the current channel quality indication, determine the maximum scheduling window length according to the obtained current channel quality indication, so that a larger maximum scheduling window length can be adopted when the channel quality is good and a smaller maximum scheduling window length can be adopted when the channel quality is poor, then adjust the current scheduling window length in real time according to the number of data packets waiting to be sent and the feedback information received last time within the maximum scheduling window length range, transmit data packets according to the adjusted scheduling window length, so that the scheduling window length can be changed along with the change of the radio channel quality, that is, when the radio channel quality is good, increase the scheduling window length to save radio resources, and when the radio channel quality is poor, decrease the scheduling window length to avoid the repeated retransmission of a group of data packets, the transmission delay is reduced, thereby achieving the purpose of effectively utilizing wireless resources.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
The foregoing describes in detail a data packet transmission method, a communication device, and a communication system provided in the embodiments of the present invention, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the foregoing embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (14)
1. A method for transmitting a data packet, comprising:
adjusting the length of a current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, wherein the length of the scheduling window is greater than or equal to the minimum unit of the length of one scheduling window and less than or equal to the maximum length of the scheduling window;
transmitting the data packet according to the adjusted length of the scheduling window;
wherein, the adjusting the length of the current scheduling window according to the number of the data packets waiting to be sent and the feedback information received last time comprises:
if the last received feedback information is an Acknowledgement (ACK) message, rounding up the quotient of the number of data packets to be transmitted and the number of data packets transmitted in the minimum unit of each scheduling window length to obtain a first numerical value, increasing the length of the current scheduling window by at least one minimum unit of the length of the scheduling window to obtain a second numerical value, and taking the minimum value of the first numerical value and the second numerical value as the length of the adjusted scheduling window;
and if the last received feedback information is a non-acknowledgement (NACK) message, rounding up the quotient of the number of the data packets waiting to be transmitted and the number of the data packets transmitted in the minimum unit of each scheduling window length to be a first numerical value, reducing the length of the current scheduling window by at least one minimum unit of the length of the scheduling window to obtain a third numerical value, and taking the minimum value of the first numerical value and the third numerical value as the length of the adjusted scheduling window.
2. The method of claim 1, further comprising:
acquiring a current channel quality indication;
and determining the length of the current maximum scheduling window according to the current channel quality indication.
3. The method of claim 2, wherein the obtaining the current channel quality indication comprises:
receiving a current channel quality indication sample point reported by a terminal, and performing weighted average on the received current channel quality indication sample point to obtain a current channel quality indication; or,
and receiving a current channel quality indicator reported by the terminal, wherein the current channel quality indicator is obtained by the terminal by performing weighted average on a measured current channel quality indicator sample point.
4. The method of claim 2, wherein determining the current maximum scheduling window length according to the current channel quality indication comprises:
and searching a corresponding relation table of the channel quality indication and the maximum scheduling window length maintained by the base station according to the current channel quality indication, and determining the current maximum scheduling window length.
5. The method of claim 1, wherein the transmitting the data packet according to the adjusted scheduling window length comprises:
and if the last received feedback information is an ACK message, transmitting a new data packet according to the adjusted length of the scheduling window.
6. The method of claim 1, wherein the transmitting the data packet according to the adjusted scheduling window length comprises:
if the last received feedback information is NACK information, then
Retransmitting all data packets within the error scheduling window length according to the adjusted scheduling window length; or,
retransmitting a first error data packet in the error scheduling window length and all data packets behind the error data packet according to the adjusted scheduling window length, wherein the NACK message carries an error data packet identifier; or,
and retransmitting error data packets within the error scheduling window length according to the adjusted scheduling window length, wherein the NACK message carries the error data packet identification.
7. A communication device, comprising:
the adjusting unit is used for adjusting the length of the current scheduling window according to the number of data packets waiting to be sent and the feedback information received last time, wherein the length of the scheduling window is more than or equal to the minimum unit of the length of one scheduling window and less than or equal to the length of the maximum scheduling window;
the transmission unit is used for transmitting the data packet according to the length of the scheduling window adjusted by the adjusting unit;
the adjusting unit comprises a first adjusting subunit and a second adjusting subunit;
a first adjusting subunit, configured to, when the last received feedback information is an ACK acknowledgment message, round up a quotient of the number of packets to be sent and the number of packets sent in the minimum unit of each scheduling window length to obtain a first numerical value, increase the current scheduling window length by at least one minimum unit of the scheduling window length to obtain a second numerical value, and obtain a minimum value of the first numerical value and the second numerical value as an adjusted scheduling window length;
and the second adjusting subunit is used for rounding up the quotient of the number of the data packets to be transmitted and the number of the data packets transmitted by the minimum unit of each scheduling window length to obtain a first numerical value, reducing the current scheduling window length by at least one minimum unit of the scheduling window length to obtain a third numerical value, and taking the minimum value of the first numerical value and the third numerical value as the adjusted scheduling window length.
8. The communication device of claim 7, further comprising:
an obtaining unit, configured to obtain a current channel quality indication;
and the determining unit is used for determining the length of the current maximum scheduling window according to the current channel quality indication acquired by the acquiring unit.
9. The apparatus according to claim 8, wherein said acquisition unit comprises:
the first receiving subunit is used for receiving the current channel quality indication sample point reported by the terminal;
and the first calculating subunit is used for performing weighted average on the current channel quality indication sample points received by the first receiving subunit to obtain the current channel quality indication.
10. The communication device according to claim 8, wherein the obtaining unit is specifically:
and the second receiving subunit is configured to receive a current channel quality indicator reported by the terminal, where the current channel quality indicator is obtained by performing, by the terminal, weighted average on a measured current channel quality indicator sample point.
11. The communication device according to claim 7, wherein the transmission unit includes:
the first transmission subunit is configured to transmit a new data packet according to the length of the scheduling window adjusted by the first adjustment subunit when the last received feedback information is an ACK message;
and the second transmission subunit is used for retransmitting all data packets in the error scheduling window length according to the scheduling window length adjusted by the second adjustment subunit when the feedback information received last time is a NACK message, or retransmitting a first error data packet in the error scheduling window length and all data packets behind the error data packet according to the scheduling window length adjusted by the second adjustment subunit, or retransmitting the error data packet in the error scheduling window length according to the scheduling window length adjusted by the second adjustment subunit.
12. A communication system, comprising:
the sending end communication equipment is used for adjusting the length of a current scheduling window according to the number of data packets waiting to be sent and feedback information sent by the receiving end communication equipment received last time, wherein the length of the scheduling window is more than or equal to the minimum unit of the length of one scheduling window and less than or equal to the maximum scheduling window length, and the data packets are sent to the receiving end communication equipment according to the adjusted length of the scheduling window; wherein, the adjusting the length of the current scheduling window according to the number of the data packets waiting to be sent and the feedback information received last time comprises: if the last received feedback information is an Acknowledgement (ACK) message, rounding up the quotient of the number of data packets to be transmitted and the number of data packets transmitted in the minimum unit of each scheduling window length to obtain a first numerical value, increasing the length of the current scheduling window by at least one minimum unit of the length of the scheduling window to obtain a second numerical value, and taking the minimum value of the first numerical value and the second numerical value as the length of the adjusted scheduling window; if the last received feedback information is a non-acknowledgement (NACK) message, rounding up the quotient of the number of data packets waiting to be transmitted and the number of data packets transmitted in the minimum unit of each scheduling window length to obtain a first numerical value, reducing the length of the current scheduling window by at least one minimum unit of the length of the scheduling window to obtain a third numerical value, and taking the minimum value of the first numerical value and the third numerical value as the length of the adjusted scheduling window;
and the receiving end communication equipment is used for receiving the data packet sent by the sending end communication equipment and sending the feedback message to the sending end communication equipment.
13. The communication system of claim 12, further comprising:
the sending-end communication device is further configured to obtain a current channel quality indicator, and determine a current maximum scheduling window length according to the current channel quality indicator.
14. The communication system of claim 12, further comprising:
the sending end communication equipment is also used for transmitting a new data packet according to the adjusted length of the scheduling window when the feedback information received last time is an ACK message; retransmitting all data packets in the error scheduling window length according to the adjusted scheduling window length when the last received feedback information is NACK information; or retransmitting the first error data packet in the error scheduling window length and all data packets behind the error data packet according to the adjusted scheduling window length, or retransmitting the error data packet in the error scheduling window length according to the adjusted scheduling window length.
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| WO2014110781A1 (en) * | 2013-01-18 | 2014-07-24 | Broadcom Corporation | Repetition transmission for downlink control signal |
| CN103780619B (en) * | 2014-01-08 | 2018-02-09 | 深圳市掌玩网络技术有限公司 | Wide area network real-time interactive game synchronization method, apparatus and system |
| EP3295586B1 (en) | 2015-05-14 | 2021-06-30 | Samsung Electronics Co., Ltd. | Method and apparatus for managing contention window in wireless communication system |
| CN109417443B (en) * | 2016-07-27 | 2021-06-01 | Oppo广东移动通信有限公司 | Method for transmitting feedback information, terminal equipment and base station |
| CN107896390B (en) * | 2016-10-04 | 2020-05-26 | 上海朗帛通信技术有限公司 | Method and device for low-delay UE and base station |
| CN114978430B (en) * | 2017-02-06 | 2024-10-15 | 中兴通讯股份有限公司 | Data transmission method and terminal equipment |
| CN106850153B (en) * | 2017-03-27 | 2020-05-22 | 网宿科技股份有限公司 | Data retransmission method and system |
| CN107395325B (en) * | 2017-07-10 | 2020-04-17 | 中国电子科技集团公司第二十八研究所 | Adaptive estimation transmission method serving tactical communication network |
| CN110035017A (en) * | 2018-01-12 | 2019-07-19 | 华为技术有限公司 | A kind of communication means and device |
| CN108496390B (en) * | 2018-04-11 | 2022-09-09 | 北京小米移动软件有限公司 | Data transmission method and device in unauthorized cell, base station and user equipment |
| CN110380818A (en) * | 2019-07-02 | 2019-10-25 | 石春 | A kind of self-adapting regulation method of data packet length |
| CN110351028B (en) * | 2019-07-15 | 2020-11-20 | 联想(北京)有限公司 | Data processing method and device and electronic equipment |
| CN113438180B (en) * | 2021-06-02 | 2022-07-26 | 广联达科技股份有限公司 | Transmission control method, device and equipment for UDP (user Datagram protocol) data packet and readable storage medium |
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