Self-adaptive time slot distribution method with high time slot use ratio in satellite network

Abstract

The invention relates to a self-adaptive time slot distribution method with high time slot use ratio in a satellite network, and belongs to the technical field of the resource distribution and wireless access. A frame structure can be dynamically adjusted according to actual network service volume, thereby achieving aims of improving time slot use ratio, improving the successful access probability, and enhancing the system performance. Compared with the prior art, the parameter setting can be performed according to different application scenes through the method disclosed by the invention, thereby enabling the method to be suitable for the satellite network, cellular network, WiFi and WiMax and like network demands, and the good use value is provided.

Description

technical field

[0001] The invention relates to an adaptive time slot allocation method with high time slot utilization in a satellite network. Background technique

[0002] Before the operation of the satellite network, channel resources are allocated to each node in the network in advance according to a certain allocation algorithm. According to allocated resources, there are several methods such as time division multiple access TDMA, frequency division multiple access FDMA, code division multiple access CDMA and space division multiple access SDMA. At present, satellite networks generally adopt the TDMA allocation method.

[0003] Time Division Multiple Access TDMA divides time into periodic time frames, each time frame is divided into several time slots, and then according to a certain time slot allocation principle, each user is allocated one or more time slots. The user sends data in the specified time slot, if the user does not transmit data in the specified time slo...

Examples

Embodiment 1

[0035] Adaptive frame structure such as figure 1 As shown, the entire frame is divided into a static area and a dynamic area.

[0036] Static area: The transmission of services with fixed transmission frequency, high priority or certain QoS requirements is centrally allocated by the central controller, with a maximum length constraint;

[0037] Dynamic area: transmit random services, not assigned by the central controller, and the terminals randomly compete to seize the time slot, with minimum length constraints;

[0038] The central controller will adjust the frame structure as needed according to the actual business type and traffic volume of the network, and broadcast the new frame structure to the network user terminal in the frame structure update cycle, and the network user terminal will use the new frame structure in the next cycle according to the received information. Frame structure transmission service (one update period includes N frames). In order to ensure that...

Embodiment 2

[0049] In order to reduce the complexity and process of updating the entire frame structure and maintain high slot utilization in low network traffic scenarios, the adaptive frame structure is modified as image 3 As shown, it includes three parts: static area, leased area and dynamic area:

[0050] Static zone: transmit services with fixed transmission frequency, high priority or certain QoS requirements, which are centrally allocated by the central controller;

[0051] Dynamic area: transmit random services, not assigned by the central controller, and the terminals randomly compete to seize the time slot;

[0052] Leased area: Any business that meets the transmission requirements can be transmitted, and the central controller will lease the time slots in the leased area to static and dynamic services on demand, that is, when the network traffic is large, static services and random services without transmission time slots The business can apply to the central controller for ...

Embodiment 3

[0073] In order to balance the access requirements of static services and dynamic access, it is necessary to reasonably design the area lengths of the static area and the dynamic area. Set the maximum duration constraint for the static area, denoted as T 静_max , set the minimum duration constraint for the dynamic region, denoted as T 动_min . When T 静_max When the transmission requirements are not met, the traditional method generally sorts the services according to the user terminal priority or service priority, and deletes the services that overflow the service queue length. In this embodiment, the priority of the user terminal and the priority of the service are jointly considered, a queuing utility function is established, and a queue overflow deletion algorithm is given.

[0074] The algorithm firstly gives the utility function for evaluating the time slot allocation index. The larger the value of the utility function is, the higher the priority is; the priority is to a...

technical field

[0001] The invention relates to an adaptive time slot allocation method with high time slot utilization in a satellite network. Background technique

[0002] Before the operation of the satellite network, channel resources are allocated to each node in the network in advance according to a certain allocation algorithm. According to allocated resources, there are several methods such as time division multiple access TDMA, frequency division multiple access FDMA, code division multiple access CDMA and space division multiple access SDMA. At present, satellite networks generally adopt the TDMA allocation method.

[0003] Time Division Multiple Access TDMA divides time into periodic time frames, each time frame is divided into several time slots, and then according to a certain time slot allocation principle, each user is allocated one or more time slots. The user sends data in the specified time slot, if the user does not transmit data in the specified time slo...

Examples

Embodiment 1

[0035] Adaptive frame structure such as figure 1 As shown, the entire frame is divided into a static area and a dynamic area.

[0036] Static area: The transmission of services with fixed transmission frequency, high priority or certain QoS requirements is centrally allocated by the central controller, with a maximum length constraint;

[0037] Dynamic area: transmit random services, not assigned by the central controller, and the terminals randomly compete to seize the time slot, with minimum length constraints;

[0038] The central controller will adjust the frame structure as needed according to the actual business type and traffic volume of the network, and broadcast the new frame structure to the network user terminal in the frame structure update cycle, and the network user terminal will use the new frame structure in the next cycle according to the received information. Frame structure transmission service (one update period includes N frames). In order to ensure that...

Embodiment 2

[0049] In order to reduce the complexity and process of updating the entire frame structure and maintain high slot utilization in low network traffic scenarios, the adaptive frame structure is modified as image 3 As shown, it includes three parts: static area, leased area and dynamic area:

[0050] Static zone: transmit services with fixed transmission frequency, high priority or certain QoS requirements, which are centrally allocated by the central controller;

[0051] Dynamic area: transmit random services, not assigned by the central controller, and the terminals randomly compete to seize the time slot;

[0052] Leased area: Any business that meets the transmission requirements can be transmitted, and the central controller will lease the time slots in the leased area to static and dynamic services on demand, that is, when the network traffic is large, static services and random services without transmission time slots The business can apply to the central controller for ...

Embodiment 3

[0073] In order to balance the access requirements of static services and dynamic access, it is necessary to reasonably design the area lengths of the static area and the dynamic area. Set the maximum duration constraint for the static area, denoted as T 静_max , set the minimum duration constraint for the dynamic region, denoted as T 动_min . When T 静_max When the transmission requirements are not met, the traditional method generally sorts the services according to the user terminal priority or service priority, and deletes the services that overflow the service queue length. In this embodiment, the priority of the user terminal and the priority of the service are jointly considered, a queuing utility function is established, and a queue overflow deletion algorithm is given.

[0074] The algorithm firstly gives the utility function for evaluating the time slot allocation index. The larger the value of the utility function is, the higher the priority is; the priority is to a...

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