CN116015562A - Retransmission data control method based on wireless channel quality - Google Patents
Retransmission data control method based on wireless channel quality Download PDFInfo
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Abstract
The invention relates to the technical field of wireless communication, in particular to a retransmission data control method based on wireless channel quality, which comprises the steps of setting a parameter retransmission control rate, a retransmission times control threshold, a retransmission control lifting step length, a retransmission control reducing step length, a retransmission times reducing threshold and a retransmission times lifting threshold; and then, by judging whether the MCS in the timer is in a steady state or not and adjusting the maximum retransmission times together with the set parameters, the maximum retransmission times can be controlled according to the quality of the channel, and the self-adaptive adjustment of the maximum retransmission times is realized.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a retransmission data control method based on wireless channel quality.
Background
In 5G communication, two frequency bands, FR1 (sub 6 Ghz) and FR2 (millimeter wave) are mainly used at present, whichever is mainly processed by a hybrid automatic repeat request (harq) mechanism of a MAC (medium access control) layer in terms of data loss errors, that is, a received error data packet is stored in a harqbuffer through the harq with soft combining, and is combined with a subsequently received retransmission data packet to obtain a more reliable data packet, then the data packet is decoded, and if the data packet fails, retransmission is repeated, and soft combining is performed.
In the Downlink Control Information (DCI), the downlink control information (dl) carries NDI (New DataIndicator, new data indication) to indicate whether the current retransmission (NDI is flipped) or the retransmission (NDI is not flipped) is performed under the same harq process ID; UL retransmission uses a different RV (redundancy version) and RV is determined by DCI 0.
At present, the manufacturer can set up the maximum downlink and uplink retransmission times by himself, no matter the quality of the channel, if the set maximum retransmission times are failed, namely the retransmission is failed, when the channel condition is bad, for example, the MCS (modulation and coding scheme) has fallen 0, the last several times of retransmission service still has most failures, especially for the large traffic service at this time, the RB occupation is larger, the retransmission has higher scheduling priority, the last several times of retransmission is equivalent to occupying a large amount of air interface resources and is also ineffective scheduling, thus causing a large amount of air interface resource waste; when MCS is stabilized at other orders (MCS > 0), 4 retransmissions may occasionally occur, i.e. the data transmission is still failed, and the data transmission effectiveness of the air interface is not guaranteed. Based on this, the setting of the maximum retransmission times does not consider the quality of the channel, and the effectiveness of the data transmission cannot be ensured while the waste of the air interface resources is caused, so a technology is needed to control the maximum retransmission times according to the quality of the channel, so as to achieve the purposes of reducing the waste of the air interface resources and ensuring the effectiveness of the data transmission.
Disclosure of Invention
In order to solve the problem that the channel quality is not considered in the setting of the maximum retransmission times, and the effectiveness of data transmission cannot be guaranteed while the waste of air interface resources is caused, the invention aims to provide a retransmission data control method based on wireless channel quality, and the adopted technical scheme is as follows:
setting a retransmission control rate, a retransmission times control threshold, a retransmission control lifting step length, a retransmission control reducing step length, a retransmission times reducing threshold and a retransmission times lifting threshold;
judging whether the MCS in the timer is in a steady state or not;
when the MCS is in a steady state, starting the measurement of the maximum retransmission times, and recording the current retransmission control rate and the MCS;
if the current retransmission control rate is greater than the retransmission times control threshold and the MCS is greater than 0, adding the retransmission times adjustment step length to the retransmission control lifting step length; if the MCS is equal to 0, subtracting the retransmission control reduction step length from the value of the retransmission number adjustment step length;
if the current retransmission control rate is smaller than or equal to the retransmission times control threshold, subtracting the retransmission control reduction step length from the value of the retransmission times adjustment step length; similarly, when the value of the retransmission number adjustment step reaches the retransmission number reduction threshold, the maximum retransmission number of the set number is reduced; when the value of the retransmission times adjustment step length reaches a retransmission times lifting threshold, increasing the maximum retransmission times of the set times;
when the MCS is not in a steady state, the timer clears 0, the retransmission times measure clear 0, and the retransmission times adjust the step length clear 0.
Preferably, the retransmission control rate is a frequency ratio when the number of retransmissions in a certain number of packets is the maximum number of retransmissions.
Preferably, the retransmission times control threshold, the retransmission control lifting step length, the retransmission control reducing step length, the retransmission times reducing threshold and the retransmission times lifting threshold can be configured according to manufacturers.
The embodiment of the invention has at least the following beneficial effects:
the invention sets the parameter retransmission control rate, the retransmission times control threshold, the retransmission control lifting step length, the retransmission control reducing step length, the retransmission times reducing threshold and the retransmission times lifting threshold, and utilizes the set parameter and the channel quality to jointly adjust the maximum retransmission times, so that the maximum retransmission times can be adaptively adjusted according to the channel quality, the data transmission is effectively ensured in FR1 and FR2 multi-user scenes or in scenes with poor signal quality, the resource utilization of an air interface is also saved while the effectiveness of the data transmission is ensured, and the scheduling resource can be fully utilized, in particular, when the channel quality is extremely poor (MCS=0), the air interface resource occupation is saved, and the scheduling resource is fully utilized; when the channel quality is good (MCS is more than or equal to 1), the effectiveness of data transmission is ensured on the premise of not wasting air interface resources.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions and advantages of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an embodiment of a retransmission data control method based on wireless channel quality according to the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention to achieve the preset purpose, the following detailed description of the specific embodiments, structures, features and effects thereof according to the present invention is given with reference to the accompanying drawings and the preferred embodiments. In the following description, different "one embodiment" or "another embodiment" means that the embodiments are not necessarily the same. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Referring to fig. 1, a flowchart of a retransmission data control method based on wireless channel quality according to an embodiment of the present invention is shown, and the method includes the following steps:
step 1, setting a retransmission control rate, a retransmission times control threshold, a retransmission control lifting step length, a retransmission control reducing step length, a retransmission times reducing threshold and a retransmission times lifting threshold.
The Retransmission Control Ratio (RCR) is a number of times when the number of retransmissions is the maximum number of retransmissions within a certain number of packets. For example, the current maximum retransmission times are configured as n times, the number of times of retransmission n times in 100 packets is m%, and then the retransmission control rate is m%; the retransmission control rate is a parameter of a UE (user equipment) level.
A retransmission number control threshold (RCH) is set as a threshold for adjusting the retransmission number, and is similar to a ber threshold, the retransmission number control threshold can be configured by a manufacturer according to the manufacturer, and the adjustment step length of the retransmission number is adjusted after the retransmission number control threshold is reached; RCH is a base station level parameter.
Preferably, the retransmission times control threshold, the retransmission control lifting step length, the retransmission control reducing step length, the retransmission times reducing threshold and the retransmission times lifting threshold can be configured according to manufacturers.
In this embodiment, the base station configures 4 cells, the maximum uplink and downlink retransmission times of each cell are set to 4 times, 256 qamtables are supported, the uplink and downlink Bler threshold is set to 10%, the retransmission times control threshold is set to 5%, the retransmission control lifting step length is 1, the retransmission control reducing step length is 1, the retransmission times reducing threshold is-5, the retransmission times lifting threshold is 5, each cell has 2 UEs (user equipment), two UEs are accessed at the midpoint and the very poor point, and the two UE identifiers of the cell 1 are 61 and 125, respectively. As other embodiments, the practitioner may set the retransmission times control threshold, the retransmission control lifting step length, the retransmission control reducing step length, the retransmission times reducing threshold and the retransmission times lifting threshold according to the actual situation.
In the above embodiment, by setting the parameter retransmission control rate, the retransmission number control threshold, the retransmission control lifting step length, the retransmission control reducing step length, the retransmission number reducing threshold and the retransmission number lifting threshold, the purpose of adaptively adjusting the maximum retransmission number is achieved, which avoids the problems that in 5GFR1 and FR2, the data error correction processing is implemented by the MAC layer through the harq mechanism, the retransmission does not adjust the MCS, the setting of the maximum retransmission number is generally set by the manufacturer, and the failure of adaptively adjusting causes a large amount of air interface resource waste and the data transmission effectiveness of the air interface cannot be ensured.
Step 2, judging whether the MCS in the timer is in a steady state, when the MCS is in the steady state, starting the measurement of the maximum retransmission times, and recording the current retransmission control rate and the MCS; if the current retransmission control rate is greater than the retransmission times control threshold and the MCS is greater than 0, adding the retransmission times adjustment step length to the retransmission control lifting step length; if the MCS is equal to 0, subtracting the retransmission control reduction step length from the value of the retransmission number adjustment step length; if the current retransmission control rate is smaller than or equal to the retransmission times control threshold, subtracting the retransmission control reduction step length from the value of the retransmission times adjustment step length; similarly, when the value of the retransmission number adjustment step reaches the retransmission number reduction threshold, the maximum retransmission number of the set number is reduced; when the value of the retransmission times adjustment step length reaches a retransmission times lifting threshold, increasing the maximum retransmission times of the set times; when the MCS is not in a steady state, the timer clears 0, the retransmission times measure clear 0, and the retransmission times adjust the step length clear 0.
The MCS refers to what modulation scheme and coding rate the base station tells the terminal what the PDSCH channel transmitted by the base station uses, or what modulation scheme and coding rate the terminal should use when transmitting the PUSCH channel.
Specifically, the method for judging whether the MCS in the timer is in a steady state is as follows: judging whether the value of the MCS is stable at a fixed value and not changed after the timer is overtime, and judging that the MCS in the timer is in a stable state if the value of the MCS is stable at a fixed value and not changed after the timer is overtime; for example, after the timer times out, the value of the MCS is stable at 0 and is not changed, which indicates that the MCS is in a stable state and the MCS is stable at 0; if the value of the MCS changes after the timer is overtime, the MCS in the timer is judged not to be in a steady state.
The initial value of the retransmission number adjustment step is 0, and the change of the retransmission number adjustment step is divided into 2 cases, namely, the 1 st change case: the value of the retransmission times adjustment step length is added with the retransmission control lifting step length; 2 nd variation: the retransmission control reduction step length is subtracted from the value of the retransmission number adjustment step length.
When the MCS is in a steady state, starting the measurement of the maximum retransmission times, and recording the current retransmission control rate and the MCS; if the current retransmission control rate is greater than the retransmission times control threshold and the MCS is greater than 0, adding the retransmission control lifting step length to the value of the retransmission times adjustment step length, and corresponding to the 1 st change condition of the retransmission times adjustment step length.
When the MCS is in a steady state, starting the measurement of the maximum retransmission times, and recording the current retransmission control rate and the MCS; and if the current retransmission control rate is greater than the retransmission times control threshold and the MCS is equal to 0, subtracting the retransmission control reduction step length from the value of the retransmission times adjustment step length, and corresponding to the 2 nd change condition of the retransmission times adjustment step length.
When the MCS is in a steady state, starting the measurement of the maximum retransmission times, and recording the current retransmission control rate and the MCS; and if the current retransmission control rate is smaller than or equal to the retransmission times control threshold, subtracting the retransmission control reduction step length from the value of the retransmission times adjustment step length, and corresponding to the 2 nd change condition of the retransmission times adjustment step length.
Further, when the value of the retransmission number adjustment step reaches the retransmission number reduction threshold, the maximum retransmission number of the set number is reduced; and when the value of the retransmission times adjustment step length reaches the retransmission times lifting threshold, increasing the maximum retransmission times of the set times.
In this embodiment, the UE125 performs the normal data service at the very bad point, obtains the MCS of the point, and stabilizes the MCS to 0 in the timer, where the bler threshold is about 30%.
The measurement statistics UE125 counts the number of retransmissions when the MCS is stable to 0, if the 4-retransmission duty ratio reaches 5%, that is, the retransmission control rate reaches the retransmission control threshold, the value of the retransmission number adjustment step is-1, and since the initial value of the retransmission number adjustment step is 0, the value of the retransmission number adjustment step is-1 at this time, when the value of the retransmission number adjustment step is-5, the retransmission number is reduced by 1, and then the retransmission number is 3, the maximum retransmission number maintained for this UE is changed to 5, and the maximum retransmission number corresponding to the reduction of the set number is 1, and in this embodiment, the value of the set number is 1.
If the number of retransmissions of the UE61 is reduced to 3, the maximum number of retransmissions maintained for this UE is changed to a count of 3 retransmissions.
In this embodiment, the UE61 performs the normal data service in the middle point bit, obtains the MCS of the point bit, and in the timer, the MCS is in a steady state, for example, the MCS is stabilized to be 12, and the bler threshold fluctuates between 5% and 10%.
Measuring and counting retransmission times when the MCS of the UE61 is stabilized to be 12, if the retransmission times reach 5% of the duty ratio of 4 times, namely, the retransmission control rate reaches the retransmission times control threshold, the retransmission times adjust the value +1 of the step length, if the retransmission times reach less than 5% of the duty ratio of 4 times, the value-1 of the retransmission times adjust the step length, and the like, and when the value of the retransmission times adjust the step length reaches 5, the retransmission times of the UE are increased by 1 time and are retransmitted for 5 times, namely, the value of the maximum retransmission times is 5; when the value of the retransmission times adjustment step length reaches-5, the retransmission times-1 are 3 times of retransmission, namely the value of the maximum retransmission times is 3. The maximum retransmission number has a maximum value and a minimum value, in this embodiment, the maximum value is set to 6, the minimum value is set to 3, and in a specific operation process, an implementer can adjust the values of the maximum value and the minimum value according to actual conditions.
In this embodiment, if the number of retransmissions of the UE61 reaches 5, the maximum number of retransmissions maintained for this UE is changed to a count of 5 retransmissions.
And judging that the priority of the 5 th retransmission of the UE61 user is reduced, namely, the scheduling priority is retransmission > 5 th and 6 th retransmission, and ensuring the flow stability of other users during multi-user scheduling.
The invention provides a retransmission data control method based on wireless channel quality, which is characterized in that parameters, namely a retransmission control rate, a retransmission times control threshold, a retransmission control lifting step length, a retransmission control reducing step length, a retransmission times reducing threshold and a retransmission times lifting threshold are set; and the maximum retransmission times are regulated by utilizing the set parameters and the channel quality together, so that the maximum retransmission times can be adaptively regulated according to the channel quality, the data transmission reliability of the UE can be further ensured when the MCS is more than 0, and the air interface resource waste caused by repeated invalid retransmission at the extremely bad point is ensured when the MCS is=0.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the scope of the embodiments of the present application, and are intended to be included within the scope of the present application.
Claims (3)
1. A retransmission data control method based on wireless channel quality, the method comprising the steps of:
setting a retransmission control rate, a retransmission times control threshold, a retransmission control lifting step length, a retransmission control reducing step length, a retransmission times reducing threshold and a retransmission times lifting threshold;
judging whether the MCS in the timer is in a steady state or not;
when the MCS is in a steady state, starting the measurement of the maximum retransmission times, and recording the current retransmission control rate and the MCS;
if the current retransmission control rate is greater than the retransmission times control threshold and the MCS is greater than 0, adding the retransmission times adjustment step length to the retransmission control lifting step length; if the MCS is equal to 0, subtracting the retransmission control reduction step length from the value of the retransmission number adjustment step length;
if the current retransmission control rate is smaller than or equal to the retransmission times control threshold, subtracting the retransmission control reduction step length from the value of the retransmission times adjustment step length; similarly, when the value of the retransmission number adjustment step reaches the retransmission number reduction threshold, the maximum retransmission number of the set number is reduced; when the value of the retransmission times adjustment step length reaches a retransmission times lifting threshold, increasing the maximum retransmission times of the set times;
when the MCS is not in a steady state, the timer clears 0, the retransmission times measure clear 0, and the retransmission times adjust the step length clear 0.
2. The retransmission data control method based on wireless channel quality according to claim 1, wherein the retransmission control rate is a number of times when the number of retransmissions in a certain number of packets is the maximum number of retransmissions.
3. The method for controlling retransmission data based on wireless channel quality according to claim 1, wherein the retransmission times control threshold, the retransmission control lifting step length, the retransmission control reducing step length, the retransmission times reducing threshold and the retransmission times lifting threshold are all configured by the manufacturer.
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