CN116015562A - Retransmission data control method based on wireless channel quality - Google Patents

Abstract

The present invention relates to the technical field of wireless communication, in particular to a retransmission data control method based on wireless channel quality, setting parameter retransmission control rate, retransmission times control threshold, retransmission control raising step size, retransmission control decreasing step size, The number of retransmissions reduces the threshold and the number of retransmissions raises the threshold; and then adjusts the maximum number of retransmissions by judging whether the MCS in the timer is in a steady state and setting parameters, that is, the maximum number of retransmissions can be controlled according to the quality of the channel to achieve Adaptive adjustment of the maximum number of retransmissions. Therefore, the present invention can reduce the waste of air interface resources and ensure the effectiveness of data transmission by adaptively adjusting the maximum number of retransmissions.

Description

A retransmission data control method based on wireless channel quality

technical field

The invention relates to the technical field of wireless communication, in particular to a method for controlling retransmission data based on wireless channel quality.

Background technique

In 5G communication, two frequency bands are mainly used at present, namely FR1 (sub6Ghz) and FR2 (millimeter wave), no matter which one is mainly controlled by the MAC (MediumAccessControl, media access control) layer harq ( Hybridautomaticrepeatrequest (hybrid automatic repeat request) mechanism for processing, that is, through harq with soft merge, the received error data packet is stored in a harqbuffer, and is merged with the subsequent received retransmission data packet to obtain more reliable , and then decode the data packet, if it still fails, repeat the retransmission, and then perform soft merging.

Scheduling user DCI (DownlinkControlInformation, downlink control information) will carry NDI (NewDataIndicator, new data indication), indicating whether the same harq process ID is currently a new transmission (NDI reversal) or retransmission (NDI is not reversed); UL retransmission Different RVs (redundantversion, redundancy version) are used, and the RV is determined by DCI0.

At present, whether it is FR1 or FR2, general manufacturers can set the maximum number of downlink and uplink retransmissions by themselves. Regardless of the quality of the channel, if the set maximum number of retransmissions fails, the retransmission will fail. When the channel condition is poor , For example, MCS (Modulation and coding scheme, modulation and coding scheme) has dropped to 0, and most of the last few retransmission services still failed, especially when doing large traffic services at this time, the RB occupation will be relatively large, and retransmission has Higher scheduling priority, the last few retransmissions are equivalent to occupying a lot of air interface resources and still invalid scheduling, resulting in a lot of waste of air interface resources; when the MCS is stable at other orders (MCS>0), it may occasionally occur 4 times All retransmissions, that is, the data transmission still fails, and the validity of the data transmission of the air interface at this time cannot be guaranteed. Based on this, the setting of the maximum number of retransmissions does not take into account the quality of the channel, which causes a waste of air interface resources and cannot guarantee the effectiveness of data transmission. The number of transmissions can be controlled to reduce the waste of air interface resources and ensure the effectiveness of data transmission.

Contents of the invention

In order to solve the problem that the above-mentioned setting of the maximum number of retransmissions does not take into account the quality of the channel, resulting in a waste of air interface resources and the effectiveness of data transmission cannot be guaranteed, the purpose of the present invention is to provide a retransmission based on wireless channel quality Data transmission control method, the adopted technical scheme is as follows:

Set the retransmission control rate, retransmission times control threshold, retransmission control increase step size, retransmission control decrease step size, retransmission times reduction threshold and retransmission times increase threshold;

Determine whether the MCS in the timer is in a steady state;

When the MCS is in a steady state, enable the measurement of the maximum number of retransmissions, and record the current retransmission control rate and MCS;

If the current retransmission control rate is greater than the retransmission times control threshold and the MCS is greater than 0, then the value of the retransmission times adjustment step plus the retransmission control increase step; if the MCS is equal to 0, retransmit The value of the times adjustment step minus the retransmission control reduction step;

If the current retransmission control rate is less than or equal to the retransmission times control threshold, the value of the retransmission times adjustment step size is subtracted from the retransmission control step size reduction; and so on, when the retransmission times adjustment step size value When the threshold for reducing the number of retransmissions is reached, the maximum number of retransmissions for the set number is reduced; when the value of the adjustment step of the number of retransmissions reaches the threshold for increasing the number of retransmissions, the maximum number of retransmissions for the set number is increased;

When the MCS is not in a steady state, the timer is cleared to 0, the retransmission times measurement is cleared to 0, and the retransmission times adjustment step is cleared to 0.

Preferably, the retransmission control rate is the proportion of retransmissions in a certain number of packets when the number of retransmissions is the maximum number of retransmissions.

Preferably, the retransmission times control threshold, the retransmission control increase step size, the retransmission control decrease step size, the retransmission times reduction threshold and the retransmission times increase threshold can all be configured according to the manufacturer.

Embodiments of the present invention have at least the following beneficial effects:

The present invention sets the retransmission control rate, the retransmission times control threshold, the retransmission control raising step size, the retransmission control reducing step size, the retransmission times reduction threshold and the retransmission times raising threshold. Adjust the maximum number of retransmissions so that the maximum number of retransmissions can be adaptively adjusted according to the channel quality, which provides an effective guarantee for data transmission in FR1 and FR2 multi-user scenarios or poor signal quality scenarios, ensuring the effectiveness of data transmission At the same time, the resource usage of the air interface is also saved, and the scheduling resources can be fully utilized. Specifically, when the channel quality is extremely poor (MCS=0), the air interface resource occupation is saved, and the scheduling resources are fully utilized; when the channel quality is good ( MCS≥1), ensuring the validity of data transmission without wasting air interface resources.

Description of drawings

In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Apparently, the appended The drawings are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a flow chart of an embodiment of a method for controlling retransmission data based on wireless channel quality in the present invention.

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, below in conjunction with the accompanying drawings and preferred embodiments, the solution proposed according to the present invention, its specific implementation, structure, features and effects are described in detail described as follows. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures or characteristics of one or more embodiments may be combined in any suitable manner.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention.

Please refer to FIG. 1, which shows a flow chart of a method for controlling retransmission data based on wireless channel quality provided by an embodiment of the present invention. The method includes the following steps:

Step 1. Set the retransmission control rate, the retransmission times control threshold, the retransmission control increase step size, the retransmission control decrease step size, the retransmission times reduction threshold and the retransmission times increase threshold.

The retransmission control rate (retransmissions controls radtio, RCR) is the proportion of retransmissions in a certain number of packets when the number of retransmissions is the maximum number of retransmissions. For example, currently the maximum number of retransmissions is configured as n times, and the number of retransmissions n times within 100 packets accounts for m%, then the retransmission control rate is m%; the retransmission control rate is a parameter at the UE (user equipment, user equipment) level .

The retransmissions controls threshold (RCH) is set to adjust the threshold value of the retransmissions, similar to the Bler threshold, the retransmissions control threshold can be configured according to the manufacturer, and the retransmissions adjustment step is adjusted after the retransmissions control threshold is reached. Long; RCH is a parameter at the base station level.

Preferably, the retransmission times control threshold, the retransmission control increase step size, the retransmission control decrease step size, the retransmission times reduction threshold and the retransmission times increase threshold can all be configured according to the manufacturer.

In this embodiment, the base station is configured with 4 cells, and the maximum uplink and downlink retransmission times of each cell is set to 4 times by the base station, which supports 256Qamtable. The control raising step is 1, the retransmission control decreasing step is 1, the retransmission times reduction threshold is -5, the retransmission times raising threshold is 5, each cell has 2 UEs (user equipment, user equipment), two The UE access is at the middle point and the extreme point respectively, and the two UE identities of the cell 1 are 61 and 125 respectively. As other implementation modes, the implementer can set the retransmission times control threshold, the retransmission control increase step size, the retransmission control decrease step size, the retransmission times reduction threshold and the retransmission times increase threshold according to the actual situation.

In the above embodiment, by setting the parameters retransmission control rate, retransmission times control threshold, retransmission control increase step size, retransmission control decrease step size, retransmission times reduction threshold and retransmission times increase threshold, the maximum retransmission rate can be achieved. The purpose of adaptive adjustment of the number of times is to avoid that in 5GFR1 and FR2, the data error correction process is implemented by the MAC layer through the harq mechanism, and the retransmission will not adjust the MCS. The maximum number of retransmissions during retransmission is generally set by Manufacturers set their own settings, and failure to make adaptive adjustments will cause a lot of waste of air interface resources and the effectiveness of air interface data transmission cannot be guaranteed.

Step 2. Determine whether the MCS in the timer is in a steady state. When the MCS is in a steady state, start the measurement of the maximum number of retransmissions, and record the current retransmission control rate and MCS; if the current retransmission control rate is greater than the retransmission The number of times control threshold, and when MCS is greater than 0, the value of the retransmission times adjustment step plus the retransmission control lifting step; if the MCS is equal to 0, the retransmission times adjustment step value minus the retransmission control Reduce the step size; if the current retransmission control rate is less than or equal to the retransmission times control threshold, then the value of the retransmission times adjustment step minus the retransmission control reduces the step size; and so on, when the retransmission times adjustment step When the long value reaches the threshold for reducing the number of retransmissions, reduce the maximum number of retransmissions for the set number; when the value of the adjustment step of the number of retransmissions reaches the threshold for increasing the number of retransmissions, increase the maximum number of retransmissions for the set number; When the MCS is not in a steady state, the timer is cleared to 0, the retransmission times measurement is cleared to 0, and the retransmission times adjustment step is cleared to 0.

MCS means that the base station tells the terminal what modulation mode and coding rate the PDSCH channel transmitted by the base station uses, or what modulation mode 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: after the timer expires, judge whether the value of the MCS is stable at a fixed value and does not change; if the timer expires, the value of the MCS is stable at a fixed value. If the fixed value does not change, it is determined that the MCS in the timer is in a steady state; for example, after the timer expires, the value of the MCS is stable at 0 and does not change, which means that the MCS is in a steady state, and the MCS is stable at 0; if After the timer expires and the value of the MCS changes, it is determined that the MCS in the timer is not in a steady state.

It should be noted that the initial value of the retransmission times adjustment step size is 0, and the change of the retransmission times adjustment step size is divided into two cases, namely, the first change case: the value of the retransmission times adjustment step size plus Increase the step size of the upper retransmission control; the second change: the value of the retransmission times adjustment step size minus the retransmission control decrease step size.

When the MCS is in a steady state, enable the measurement of the maximum number of retransmissions, and record the current retransmission control rate and MCS; if the current retransmission control rate is greater than the retransmission times control threshold, and the MCS is greater than 0, retransmit The value of the number of times adjustment step plus the retransmission control uplift step corresponds to the first change of the retransmission times adjustment step.

When the MCS is in a steady state, enable the measurement of the maximum number of retransmissions, and record the current retransmission control rate and MCS; if the current retransmission control rate is greater than the retransmission times control threshold, when MCS is equal to 0, the The value of the adjustment step size minus the retransmission control reduction step size corresponds to the second change of the retransmission times adjustment step size.

When the MCS is in a steady state, open the measurement of the maximum number of retransmissions, and record the current retransmission control rate and MCS; if the current retransmission control rate is less than or equal to the retransmission times control threshold, the retransmission times adjustment step The value minus the retransmission control reduces the step size, which also corresponds to the second change of the retransmission times adjustment step size.

Further, when the value of the retransmission times adjustment step reaches the retransmission times reduction threshold, reduce the maximum number of retransmissions set times; when the retransmission times adjustment step size reaches the retransmission times increase threshold, increase Set the maximum number of retransmissions.

In this embodiment, UE 125 performs ordinary data services at a very poor point, obtains the MCS at this point, and the MCS is stable at 0 within the timer, and the Bler threshold is about 30%.

Measure and count the number of retransmissions of UE125 when the MCS is stable at 0. If the proportion of retransmissions reaches 5%, that is, the retransmission control rate reaches the retransmission times control threshold, the value of the retransmission times adjustment step size is - 1. Since the initial value of the retransmission times adjustment step is 0, the retransmission times adjustment step size is -1 at this time. When the retransmission times adjustment step size is -5, the retransmission times are reduced 1 time, then the number of retransmissions at this time is 3 times, and the maximum number of retransmissions maintained by the UE is changed to 5, which corresponds to reducing the maximum number of retransmissions from the set number of times to 1. The value of the set number of times in this embodiment is 1, as other implementations, the implementer also adjusts the value of the set times according to the actual situation.

It should be noted that, if the number of retransmissions of UE61 is reduced to 3 times, the maximum number of retransmissions maintained by the UE is changed to the statistics of 3 times of retransmissions.

In this embodiment, UE61 performs ordinary data services at the midpoint, obtains the MCS at this point, and the MCS is in a steady state within the timer, for example, the MCS is stable at 12, and the Bler threshold fluctuates between 5% and 10%.

Measure and count the retransmission times of UE61 when the MCS is stable at 12. If the retransmission times reach 4 times and the proportion reaches 5%, that is, the retransmission control rate reaches the retransmission times control threshold, then the retransmission times adjustment step size is taken as Value +1, if the proportion of retransmission times reaching 4 times does not reach 5%, then the value of the retransmission times adjustment step is -1, and so on, when the retransmission times adjustment step size reaches 5, this The number of retransmissions of the UE is increased by 1 to retransmit 5 times, that is, the value of the maximum number of retransmissions is 5; when the value of the retransmission times adjustment step reaches -5, the number of retransmissions -1 means 3 retransmissions , that is, the value of the maximum number of retransmissions is 3. Among them, the value of the maximum number of retransmissions has a maximum value and a minimum value. In this embodiment, the maximum value is set to 6, and the minimum value is set to 3. In the specific operation process, the implementer can adjust the maximum value and the minimum value according to the actual situation. The value of the value.

In this embodiment, if the number of retransmissions of UE61 reaches 5 times, the maximum number of retransmissions maintained by the UE is changed to the statistics of 5 retransmissions.

It is judged that the priority of the fifth retransmission of the UE61 user is lowered, that is, the scheduling priority is retransmission>new transmission>5th and 6th retransmissions, so as to ensure that the traffic of other users is stable during multi-user scheduling.

It should be noted that a retransmission data control method based on wireless channel quality proposed by the present invention sets parameters, namely the retransmission control rate, the retransmission times control threshold, the retransmission control raising step size, and the retransmission control reducing step size, The number of retransmissions reduces the threshold and the number of retransmissions raises the threshold; the maximum number of retransmissions is adjusted by using the set parameters and the channel quality, so that the maximum number of retransmissions can be adaptively adjusted according to the channel quality, which can be further guaranteed when MCS>0 For the data transmission reliability of the UE, when MCS=0, air interface resources are wasted due to multiple invalid retransmissions at extreme points.

The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still implement the foregoing embodiments Modifications to the technical solutions recorded in the examples, or equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of each embodiment of the application, and should be included in the scope of the technical solutions of the embodiments of the application. within the scope of protection.

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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