A method and system for railway communication spectrum sharing based on cognitive base station

A spectrum sharing and cognitive base station technology, applied in the field of railway wireless communication, can solve the problems of passenger communication experience to be improved, waste of spectrum resources, contrary to the current spectrum status, etc., to improve user experience, improve utilization, and reduce delay. Effect

Active Publication Date: 2020-09-15
SUZHOU UNIV
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AI Technical Summary

Problems solved by technology

[0006] First, the existing railway communication is a dedicated communication, and there is a waste of spectrum resources, which is contrary to the increasingly tense spectrum status
[0007] Second, in the existing railway communication environment, in-vehicle communication and passenger communication are independent of each other, and passenger communication experience needs to be improved

Method used

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  • A method and system for railway communication spectrum sharing based on cognitive base station
  • A method and system for railway communication spectrum sharing based on cognitive base station
  • A method and system for railway communication spectrum sharing based on cognitive base station

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Embodiment 1

[0059] Through the above analysis, it is found that the LTE-R system based on RR scheduling not only wastes resources in idle time, but also wastes resources in TTI.

[0060] In order to improve the spectrum utilization rate of the LTE-R system, the present invention proposes to upgrade the LTE-R eNodeB to a C-eNodeB, and defines that the C-eNodeB has the following capabilities: 1. Accurately distinguish between PU and SU service data, ensure PU communication, and ensure Train operation is safe. 2. In the TTI with wasted RBs, allocate the wasted RBs to SU communication. 3. In the TTI where the SU has available RBs, the SU data of different services are processed differently according to the TOS value priority policy, reducing the delay of real-time services.

[0061] In order to reduce the complexity of the system, reduce the penetration loss and the interference of the SU using the LTE-R authorized frequency band to the vehicle-ground communication, the present invention ado...

Embodiment 2

[0068] Figure 5 It is a flow chart of the railway communication spectrum sharing method based on the cognitive base station according to the present invention, and the method includes the following steps:

[0069] Step 1, the current transmission time interval starts;

[0070] Step 2: Cognitive LTE-R base station C-eNodeB traverses all radio bearers, and obtains the number of all active primary users in the current transmission time interval;

[0071] Step 3, C-eNodeB judges whether there is a primary user waiting for scheduling, if so, proceed to step 4, if not, proceed to step 9;

[0072] Step 4: C-eNodeB allocates the same amount of resource blocks to the primary user according to the scheduling policy of average allocation in round-robin training, configures the corresponding downlink scheduling configuration instruction parameters and saves the relevant information of the primary user that has not been served, and waits for the next transmission time interval;

[0073]...

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Abstract

The invention discloses a cognitive base station-based railway communication spectrum sharing method and system. The function of the cognitive base station, cognitive network components and a queue management policy of the cognitive base station are defined. The cognitive base station distinguishes received data at first, and determines that the data is primary user data or secondary user data; the cognitive base station distributes resources to primary users preferentially, and distributes remaining resources to secondary users; and when processing secondary user data, the cognitive base station distributes resources to secondary users with large service type values preferentially, so as to shorten the average receiving time delay of the secondary users with large service type values as much as possible. Due to building of the cognitive wireless network in a dedicated railway communication network, vehicle-ground normal communication is ensured, further, the spectrum resource is usedmore efficiently due to the cognitive base station in the cognitive network, and real-time businesses of passengers are delayed for a shorter time.

Description

technical field [0001] The invention relates to the field of railway wireless communication, in particular to a method and system for sharing frequency spectrum of railway communication based on a cognitive base station. Background technique [0002] In recent years, rail transit has developed rapidly, especially high-speed rail, subway and tram. Studies have shown that the United States has proposed a plan to build high-speed rail, and the total mileage of my country's high-speed rail will exceed 18,000 kilometers by 2020. At present, most railway communication systems use the European Train Control System ETCS technology based on GSM communication, that is, the digital mobile communication system GSM-R. However, the GSM-R data carrying capacity is weak, which cannot meet the development needs of the increasingly vigorous railway business, and cannot provide convenient broadband wireless access services for passengers. [0003] As the current mainstream broadband wireless...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/14H04W28/02
CPCH04W16/14H04W28/0236
Inventor 邓宏宇汪一鸣吴澄陈蓉
Owner SUZHOU UNIV
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