Space-based VDE system channel resource allocation method

Abstract

The invention discloses a space-based VDE system channel resource allocation method, which comprises the following steps of: pre-allocating data channels of a single communication sub-frame according to allocated time slot mapping configuration of a VDE system; the space-based VDE and the terminal measure uplink and downlink signals respectively to complete channel quality monitoring; and the space-based VDE selects a to-be-allocated terminal according to the service index, selects a specified rate model according to the channel quality, completes the channel resource allocation of the terminal in the configured data channel, and executes a subsequent service data interaction process. According to the method, stable access of the terminal can be effectively guaranteed, and the service quality of system services can be improved.

Description

Technical Field

[0001] The present invention relates to the field of channel resource allocation methods, and more particularly to a space-based VDE system channel resource allocation method. Background Art

[0002] The Automatic Identification System (AIS), an early-introduction radiocommunication technology, has played a vital role in maritime communications. However, with the increasing demand for data communications, AIS has increasingly faced challenges with frequency band congestion and insufficient data transmission capacity, making it unable to meet the demands of modern maritime communications. Against this backdrop, the International Telecommunication Union (ITU) proposed the Very High Frequency Data Exchange System (VDES) concept after the 2012 World Radiocommunication Conference (WRC-12). This concept was subsequently finalized by 162 member states and 136 international organizations and groups at the 2015 World Radiocommunication Conference (WRC-15). The key feature of VDES technology lies in its multi-functional integration and optimization. It ensures the core functions of AIS—vessel identification and position reporting—while also prioritizing the transmission of this critical information by dedicating dedicated frequency bands.

[0003] Space-based VDE is a key component of the VDES system. It enables ship-to-satellite data exchange via low-orbit satellites. Combined with intersatellite link technology, it enables data exchange at any time across global waters. In space-based VDE systems, with the increase in maritime traffic and the diversification of communications services, the efficient allocation of channel resources has become a pressing issue. Summary of the Invention

[0004] At present, the VDES technical standard does not provide a channel resource allocation strategy for a space-based VDE system. Different resource allocation strategies will greatly affect the access stability and service quality of the system. In order to overcome the deficiencies in the existing technology, the present invention provides a channel resource allocation method for a space-based VDE system, which can not only effectively ensure stable terminal access, but also improve the service quality of the system business.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical solutions adopted to solve the technical problems are as follows: A space-based VDE system channel resource allocation method pre-allocates data channels for a single communication subframe according to a time slot mapping configuration already allocated by the VDE system; the space-based VDE and a terminal respectively measure uplink and downlink signals to complete channel quality monitoring; the space-based VDE selects a terminal to be allocated according to a service index, selects a specified rate model according to the channel quality, completes channel resource allocation for the terminal in the configured data channel, and executes subsequent service data interaction processes.

[0006] Furthermore, the time slot mapping configuration refers to the space-based VDE system dividing 1 minute into 2250 time slots to form 1 communication frame. communication subframes, each of which contains an ASC, DSCH, RAC and several DC channels; there are a total of 6 communication frequencies, and the time slot mapping configuration of each frequency follows the same configuration; the DC channel is used for uplink and downlink service data interaction, and user channel resource allocation is completed by the resource allocation frame of the ASC channel.

[0007] Furthermore, the data channel is pre-allocated to a single communication subframe. DC channels, of which the number of downlink DC channels used is The number of uplink DC channels used is indivual( ), the uplink data channel includes High priority and Low priority data channels ( + ), the data channel needs to be pre-set.

[0008] Furthermore, the pre-setting refers to The DC channels are pre-set with corresponding numbers according to the downlink data channels, uplink low priority DC channels and uplink high priority DC channels.

[0009] Furthermore, the channel quality monitoring refers to measuring the signal of the receiving channel, wherein the downlink channel quality refers to the measurement of the signal transmitted by the terminal to the space-based VDE, and the uplink channel quality refers to the measurement of the signal transmitted by the space-based VDE to the terminal; the measurement content includes the signal-to-noise ratio, the noise floor of the receiving channel, and the interference situation.

[0010] Furthermore, the service index refers to the terminal resource allocation based on parameter type and the corresponding weights The product and sum of can be expressed as , parameter types include priority ( ), User Type ( ), waiting time ( ), data size ( ), channel quality ( ), , where T represents the parameter type set , , N represents the number of parameter types.

[0011] Furthermore, the priority refers to the priority definition of the "Priority and messagesize" field in the resource request frame in the technical standard, "0" represents low priority and "15" represents the highest priority.

[0012] Furthermore, the designated rate model refers to a preset rate modulation model selected according to uplink and downlink channel quality and service level.

[0013] Furthermore, the service level refers to throughput priority, reliability priority and balanced mode, which can be achieved by selecting rate modulation models with high reception sensitivity, low reception sensitivity and medium reception sensitivity from the optional rate modulation model list.

[0014] Furthermore, the rate modulation model refers to the modulation parameters of the signal modulation mode, symbol rate, and coding rate specified in different LinkIDs in the technical standard.

[0015] Furthermore, the channel resource allocation refers to notifying the terminal of logical channel resources according to the pre-allocated data channel. The data channel allocation principle follows the left-to-right allocation for downlink addressing services and the right-to-left allocation for uplink addressing services.

[0016] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: While current standards do not yet provide a specific method for allocating channel resources in a space-based VDE system, the present invention's method is scientific, rational, and easy to implement, effectively improving system access stability and service quality. Based on the characteristics of a space-based VDE system, the present invention proposes a method for allocating channel resources in a space-based VDE system. Configured time slot mappings are broadcast via satellite, and terminals receive the corresponding time slot mapping configurations and send resource requests on designated logical channels. Based on channel monitoring data and the resource allocation process, the space-based VDE system allocates logical channels to the terminals and executes the final service data exchange process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings: Figure 1 is a flow chart of a space-based VDE system channel resource allocation method according to the present invention; Figure 2 This is an example diagram of the time slot mapping configuration in the present invention; Figure 3 This is an example diagram of logical channel pre-allocation in the present invention; Figure 4 This is a flow chart of channel resource allocation in the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] like Figure 1 As shown, this embodiment discloses a channel resource allocation method for a space-based VDE system. According to the time slot mapping configuration already allocated by the VDE system, a data channel for a single communication subframe is pre-allocated. The space-based VDE and the terminal respectively measure the uplink and downlink signals to complete channel quality monitoring. The space-based VDE selects the terminal to be allocated based on the service index, selects a specified rate model based on the channel quality, completes channel resource allocation for the terminal in the configured data channel, and executes the subsequent service data interaction process.

[0020] Furthermore, the time slot mapping configuration refers to the space-based VDE system dividing 1 minute into 2250 time slots to form 1 communication frame. communication subframes, each of which contains an ASC, DSCH, RAC and several DC channels; there are a total of 6 communication frequencies, and the time slot mapping configuration of each frequency follows the same configuration; the DC channel is used for uplink and downlink service data interaction, and user channel resource allocation is completed by the resource allocation frame of the ASC channel.

[0021] The data channel is pre-allocated to a single communication subframe. DC channels, of which the number of downlink DC channels used is The number of uplink DC channels used is indivual( ), the uplink data channel includes High priority and Low priority data channels ( + ), the data channel needs to be pre-set.

[0022] The presetting refers to The DC channels are pre-set with corresponding numbers according to the downlink data channels, uplink low priority DC channels and uplink high priority DC channels.

[0023] The channel quality monitoring refers to the measurement of the signal of the receiving channel, among which the downlink channel quality refers to the measurement of the signal transmitted by the terminal to the space-based VDE, and the uplink channel quality refers to the measurement of the signal transmitted by the space-based VDE to the terminal; the measurement content includes the signal-to-noise ratio, the noise floor of the receiving channel, the interference situation, etc.

[0024] The service index refers to the parameter type based on which the terminal resources are allocated. and the corresponding weights The product and sum of can be expressed as , parameter types include priority ( ), User Type ( ), waiting time ( ), data size ( ), channel quality ( )wait, , where T represents the parameter type set , , N represents the number of parameter types.

[0025] The priority refers to the priority definition of the "Priority and message size" field in the resource request frame in the technical standard, "0" represents low priority and "15" represents the highest priority.

[0026] The designated rate model refers to a preset rate modulation model selected according to uplink and downlink channel quality and service level.

[0027] The service levels refer to throughput priority, reliability priority and balanced mode, which can be achieved by selecting rate modulation models with high reception sensitivity, low reception sensitivity and medium reception sensitivity from the optional rate modulation model list.

[0028] The rate modulation model refers to the modulation parameters such as signal modulation mode, symbol rate, coding rate, etc. specified in the technical standard for different LinkIDs.

[0029] The channel resource allocation refers to notifying the terminal of logical channel resources according to the pre-allocated data channel. The data channel allocation principle follows the left-to-right allocation for downlink addressing services and the right-to-left allocation for uplink addressing services.

[0030] Specific working principle: This embodiment provides a space-based VDE system channel resource allocation method, referring to the VDES technical standard ITU-R M.2092-1 (hereinafter referred to as the "technical standard"), including the following steps: First, configure the time slot mapping that has been allocated by the VDE system, such as REF _Ref31234 \h Figure 2Two examples of time slot mapping configuration schemes are given. A one-minute communication frame is divided into 2250 time slots. The communication frame includes BBSC (Bulletin Boarding Signaling Channel), ASC (Announcement Signaling Channel), DC (Data up or down Channel), DSCH (Data acknowledgement Signaling Channel), RAC (Random Access Signaling Channel), and GS (Guard Slot) logical channels. The examples show schemes with three and six communication subframes. The time slot mapping configuration scheme must comply with the requirements of the technical standard.

[0031] Secondly, such as REF _Ref29531 \h Figure 3 An example of pre-allocation of data channels for a single communication subframe is realized. The space-based VDE system has a total of 6 communication frequencies (frequency F1 to frequency F6). Each communication subframe contains DC channels, marked as , F is the frequency number, N is the DC number (for example, frequency 1 is marked as DC_1-1 to DC_1-6), each DC channel supports uplink or downlink, reserved downlink data channels, Uplink data channels, of which Uplink data channels need to be set high-priority data channels, reserved in advance for high-priority users, and When any DC is assigned an uplink service, all frequencies of the DC with this number will be assigned an uplink service. When any DC is assigned a downlink service, all frequencies of the DC with this number will be assigned a downlink service.

[0032] Then, in the process of channel resource allocation, allocation is performed based on the service index, such as REF _Ref8639 \h Figure 4 As shown, the service index Is the only basis for resource allocation, is the parameter type and the corresponding weights The product and sum of the parameters include priority ( ), User Type ( ), waiting time ( ), data size ( ), channel quality ( )wait, , where T represents the parameter type set , , M indicates the parameter type based on; service priority refers to the priority definition of the "Priority and message size" field in the resource request frame in the technical standard. "0" indicates general priority, and "15" indicates the highest priority. Rate model selection is based on the relationship between the reception threshold values ​​of different rate modulation models and the current channel quality. The uplink rate modulation models in the standard include LinkIDs 20 to 24, and downlink LinkIDs 25 to 29 and 32 to 34. The reception threshold values ​​of different LinkIDs can be pre-set. The same channel quality may have multiple LinkIDs that meet the conditions, so a service level needs to be set to ensure service quality. Service level refers to throughput priority, reliability priority, and balanced mode. These can be achieved by selecting rate modulation models with high reception threshold values, low reception sensitivity, and medium reception threshold values ​​from the rate modulation models that meet the conditions, respectively. Service level can be pre-set.

[0033] Finally, during logical channel selection for channel resource allocation, downlink services are prioritized on the left DC channel, and uplink services on the right DC channel. During actual allocation, a queue approach can be used to sort uplink and downlink services awaiting channel resource allocation according to their service index, prioritizing uplink services and allocating them from right to left (in descending order of DC numbers). High-priority services are placed on reserved uplink data channels. When the reserved channels are full, other DC channels can be used. Downlink services are then allocated from left to right (in ascending order of DC numbers). Allocated data channels are broadcast to terminals via the ASC channel via resource allocation frames, enabling subsequent service data interaction.

[0034] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for allocating channel resources in a space-based VDE system, characterized by: According to the time slot mapping configuration already allocated by the VDE system, a single communication subframe data channel is pre-allocated; the space-based VDE and the terminal measure the uplink and downlink signals respectively to complete channel quality monitoring; the space-based VDE selects the terminal to be allocated based on the service index, selects the specified rate model based on the channel quality, completes the channel resource allocation of the terminal in the configured data channel, and executes the subsequent business data interaction process.

2. A space-based VDE system channel resource allocation method according to claim 1, characterized in that: The time slot mapping configuration refers to the space-based VDE system dividing 1 minute into 2250 time slots to form 1 communication frame. communication subframes, each of which contains an ASC, DSCH, RAC and several DC channels; there are a total of 6 communication frequencies, and the time slot mapping configuration of each frequency follows the same configuration; the DC channel is used for uplink and downlink service data interaction, and user channel resource allocation is completed by the resource allocation frame of the ASC channel.

3. A space-based VDE system channel resource allocation method according to claim 1, characterized in that: The data channel is pre-allocated to a single communication subframe. DC channels, of which the number of downlink DC channels used is The number of uplink DC channels used is indivual( ), the uplink data channel includes High priority and Low priority data channels ( + ), the data channel needs to be pre-set.

4. A space-based VDE system channel resource allocation method according to claim 3, characterized in that: The presetting refers to The DC channels are pre-set with corresponding numbers according to the downlink data channels, uplink low priority DC channels and uplink high priority DC channels.

5. A space-based VDE system channel resource allocation method according to claim 1, characterized in that: The channel quality monitoring refers to the measurement of the signal of the receiving channel, wherein the downlink channel quality refers to the measurement of the signal transmitted by the terminal to the space-based VDE, and the uplink channel quality refers to the measurement of the signal transmitted by the space-based VDE to the terminal; the measurement content includes the signal-to-noise ratio, the noise floor of the receiving channel, and the interference situation.

6. A space-based VDE system channel resource allocation method according to claim 1, characterized in that: The service index refers to the parameter type based on which the terminal resources are allocated. and the corresponding weights The product and sum of can be expressed as , parameter types include priority ( ), User Type ( ), waiting time ( ), data size ( ), channel quality ( ), , where T represents the parameter type set , , N represents the number of parameter types.

7. A space-based VDE system channel resource allocation method according to claim 6, characterized in that: The priority refers to the priority definition of the "Priority and message size" field in the resource request frame in the technical standard, where "0" indicates low priority and "15" indicates the highest priority.

8. A space-based VDE system channel resource allocation method according to claim 1, characterized in that: The designated rate model refers to a preset rate modulation model selected according to uplink and downlink channel quality and service level.

9. A space-based VDE system channel resource allocation method according to claim 8, characterized in that: The service levels refer to throughput priority, reliability priority and balanced mode, which can be achieved by selecting rate modulation models with high reception sensitivity, low reception sensitivity and medium reception sensitivity from the optional rate modulation model list.

10. A space-based VDE system channel resource allocation method according to claim 8, characterized in that: The rate modulation model refers to the modulation parameters of the signal modulation mode, symbol rate, and coding rate specified in different LinkIDs in the technical standard.

11. A space-based VDE system channel resource allocation method according to claim 1, characterized in that: The channel resource allocation refers to notifying the terminal of logical channel resources according to the pre-allocated data channel. The data channel allocation principle follows the left-to-right allocation for downlink addressing services and the right-to-left allocation for uplink addressing services.

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