A method for reducing time slot collisions for satellite user access

Abstract

The application relates to a satellite user access method for reducing time slot conflicts, which is used for adjusting uplink access time slot resources in real time and improving access utilization. Specifically, the system online user proportion, channel resource utilization and time slot conflict proportion are periodically counted, the three statistical data are respectively converted into corresponding factors, the adjustment step factor is determined according to the weighted sum of the three factors, the weighted coefficients of the three factors are dynamically adjusted by a weight factor adjustment mechanism, and finally the uplink access time slot resources are adjusted according to the adjustment step factor.

Description

Technical Field

[0001] This invention belongs to the field of high-throughput satellite communication technology, and specifically relates to a method for reducing time slot conflicts during satellite user access. Background Technology

[0002] Satellite communication boasts advantages such as wide coverage and long communication distance, but it also suffers from significant propagation delays and the inability to easily expand capacity by increasing the number of satellites. Therefore, to fully utilize satellite resources, multiple access methods are typically employed to increase resource utilization. Traditional multiple access methods include Aloha and SA, with Aloha achieving a channel utilization rate of only 18.4%, while slotted Aloha (SA) achieves 36.8%. Later, frame slotted Aloha (FSA) and other methods were proposed to further improve access utilization.

[0003] Neither slotted Aloha (SA) nor frame slotted Aloha (FSA) technologies take into account service factors such as the proportion of online users and uplink channel utilization. Summary of the Invention

[0004] In view of this, the present invention proposes a method for reducing time slot conflicts in satellite user access, which can adjust uplink access time slot resources in real time according to the number of online users, uplink channel utilization, and time slot conflict rate, thereby improving access utilization.

[0005] The specific technical solution is as follows:

[0006] A method for reducing time slot conflicts in satellite user access involves adjusting uplink access time slot resources in real time based on service conditions. The weighting factors for uplink access time slot adjustment are also adjusted in real time based on service conditions. Specifically, this includes periodically calculating the online user ratio (OnLine Ue ratio), radio resource ratio, and slot conflict ratio. These three statistical data are converted into an OnLine Ue ratio factor P1, a radio resource ratio factor P2, and a slot conflict ratio factor P3, respectively. The adjustment step size factor is determined based on the weighted sum of these three factors, where the weighting coefficients are dynamically adjusted by a weighting factor adjustment mechanism. The uplink access time slot resources are then adjusted according to the adjustment step size factor.

[0007] Furthermore, the smaller the proportion of online users, the larger P1 is; the smaller the channel resource utilization, the larger P2 is; the smaller the time slot conflict ratio, the smaller P3 is; the value range of the three factors is (0, 1).

[0008] Furthermore, adjusting uplink access time slot resources based on the adjustment step size factor specifically includes reducing uplink access time slot resources if the adjustment step size factor is less than 1, and increasing uplink access time slot resources if the adjustment step size factor is greater than 1.

[0009] Furthermore, a single scaling of uplink access time slot resources comprises access time slots for n frames, with m access time slots allocated within one frame, where 0 <n≤16,0<m<8。

[0010] Furthermore, the weighting factor adjustment mechanism is as follows:

[0011] When the system channel resource utilization rate is less than 0.3, the channel resource utilization rate factor has the highest weight, while the weights of the system online user ratio factor and the time slot conflict ratio factor decrease. The channel resource utilization rate factor plays a decisive role in the adjustment of uplink access time slot resources.

[0012] When the proportion of online users in the system is greater than 0.8, the weight of the online user proportion factor is the highest, while the weights of the channel resource utilization factor and the time slot conflict proportion factor are reduced. The online user proportion factor plays a decisive role in the adjustment of uplink access time slot resources.

[0013] When the system channel resource utilization rate and the proportion of online users are in other ranges, the weight of the system time slot conflict ratio factor is the highest, while the weights of the channel resource utilization rate factor and the proportion of online users decrease. The time slot conflict factor plays a decisive role in the adjustment ratio of uplink access time slot resources.

[0014] Beneficial effects

[0015] 1. During system operation, the uplink access time slot resources can be adjusted in real time according to network service conditions;

[0016] 2. During system operation, the uplink wireless channel resources can be utilized to the maximum extent according to network service conditions;

[0017] 3. During system operation, the weighting factors of different factors can be adjusted according to network service conditions to meet different service requirements; Attached Figure Description

[0018] Figure 1 Flowchart of the method of the present invention. Detailed Implementation

[0019] 1. Uplink access time slot resource adjustment mechanism

[0020] After the system is running, the initial maximum uplink access time slot resource is first determined, that is, the frame length N and the number of time slots per frame are determined. Then, the online user ratio, channel resource utilization ratio, and time slot conflict ratio are periodically counted. The weighted sum of each factor is calculated based on the three factors and their corresponding weights, and the adjustment step size factor is determined based on the weighted sum.

[0021] Step size adjustment factor calculation: Pstep = W1*P1 + W2*P2 + W3*P3, where P1 is the OnLine User ratio factor, P2 is the radio resource ratio factor, and P3 is the slot conflict ratio factor. Taking P1 as an example, its value is...

[0022]

[0023]

[0024] The smaller the channel resource utilization, the larger P2; the smaller the time slot conflict ratio, the smaller P3; the value range of the three factors is (0, 1], and the values ​​of P2 and P3 are similar to those of P1.

[0025] P1: When the proportion of online users in the system is close to 1, that is, when the number of terminals accessing the system reaches the rated maximum number of users, regardless of the business situation at this time, for the sake of system stability, the uplink access time slot resources will be greatly reduced to limit the number of users accessing the system from the perspective of access.

[0026] P2: When the system's channel utilization is less than 0.3, the system's air interface channel resource utilization is low. This situation usually indicates that the traffic volume of online users is low. Since the service has a certain continuity, it is understandable that the possibility of a large change in the traffic volume in the future is small. At this time, the uplink access time slot resources can be increased to reduce the probability of time slot conflicts, thereby increasing the probability of user access and reducing the user access latency.

[0027] P3: When the proportion of time slot conflicts increases, it will seriously affect the user's access probability and increase the user access latency. Therefore, it is necessary to increase the uplink access time slot resources.

[0028] 2. Uplink access time slot resource adjustment parameters

[0029] When the adjustment step size factor calculated in step 1 is less than 1, it indicates that uplink access time slot resources need to be reduced; if the adjustment step size factor is greater than 1, it indicates that uplink access time slot resources need to be increased. Therefore, based on the range of the adjustment step size factor, the number of uplink time slots to scale is determined, thereby gradually adjusting the frame length n of the uplink access time slot resources, i.e., scheduling access time slots for n frames at a time, and the number of access time slot resources m in a single frame, i.e., allocating m access time slots in a single frame, where 0 <n≤16,0<m<8。

[0030] 3. Weighting factor adjustment mechanism

[0031] When the system channel resource utilization rate is less than 0.3, the channel resource utilization rate factor has the highest weight, while the weights of the system online user ratio factor and the time slot conflict ratio factor will decrease, thus making the channel resource utilization rate factor play a decisive role in the adjustment of uplink access time slot resources.

[0032] When the proportion of online users in the system is greater than 0.8, the weight of the online user proportion factor is the highest, while the weights of the channel resource utilization factor and the time slot conflict proportion factor will decrease, thus making the online user proportion factor play a decisive role in the adjustment of uplink access time slot resources.

[0033] When the system channel resource utilization rate and the system online user ratio are in other ranges, the weight of the system time slot conflict ratio factor is the highest, while the weights of the channel resource utilization rate factor and the system online user ratio factor will decrease. Thus, the time slot conflict factor plays a decisive role in the adjustment ratio of uplink access time slot resources.

Claims

1. A method for reducing time slot conflicts in satellite user access, characterized in that: Uplink access time slot resources are adjusted in real time according to service conditions; the weighting factors of the uplink access time slot adjustment factors are also adjusted in real time according to service conditions. Specifically, this includes periodically calculating the online user ratio, radio resource ratio, and slot conflict ratio. These three statistical data are converted into the online user ratio factor P1, radio resource ratio factor P2, and slot conflict ratio factor P3, respectively. The adjustment step size factor is determined based on the weighted sum of the three factors, where the weighting coefficients of the three factors are dynamically adjusted by the weighting factor adjustment mechanism. The uplink access time slot resources are adjusted according to the adjustment step size factor. The smaller the proportion of online users, the larger P1; the smaller the channel resource utilization, the larger P2; the smaller the time slot conflict ratio, the smaller P3; the range of the three factors is (0, 1, 2, 3). ， 1]; Adjusting uplink access time slot resources based on the adjustment step size factor specifically includes reducing uplink access time slot resources if the adjustment step size factor is less than 1, and increasing uplink access time slot resources if the adjustment step size factor is greater than 1.

2. The method for reducing time slot conflicts in satellite user access according to claim 1, characterized in that: A single scaling of uplink access time slot resources comprises access time slots for n frames, with m access time slots allocated within one frame, where 0 <n≤16,0<m<8。 3. The method for reducing time slot conflicts in satellite user access according to claim 1, characterized in that: The weight factor adjustment mechanism is as follows: When the system channel resource utilization rate is less than 0.3, the channel resource utilization rate factor has the highest weight, while the weights of the system online user ratio factor and the time slot conflict ratio factor decrease. The channel resource utilization rate factor plays a decisive role in the adjustment of uplink access time slot resources. When the proportion of online users in the system is greater than 0.8, the weight of the online user proportion factor is the highest, while the weights of the channel resource utilization factor and the time slot conflict proportion factor are reduced. The online user proportion factor plays a decisive role in the adjustment of uplink access time slot resources. When the system channel resource utilization rate and the proportion of online users are in other ranges, the weight of the system time slot conflict ratio factor is the highest, while the weights of the channel resource utilization rate factor and the proportion of online users decrease. The time slot conflict factor plays a decisive role in the adjustment ratio of uplink access time slot resources.

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