[0023] The present invention will be further described below in conjunction with the description of the drawings and the specific embodiments.
[0024] In the present invention, based on the train number, the cell type covered on the train running route is a linear cell, so the driving direction is fixed, and the train number is combined to perform predictive wireless channel allocation. Specifically, since the route traveled by each train is fixed, a list of the cells passed along by each train within the network-side control range can be stored in the network-side database according to the train number. When a train is about to depart, it needs to register the train number in the network, and the network side can know the cell that the train will pass along the way based on the train number.
[0025] Such as figure 1 As shown, a wireless channel allocation method based on cellular cells along trains includes the following steps:
[0026] (1) Train number registration step S1, the mobility management device on the train sends a request to register the train number to the network side, and the network side obtains the train number;
[0027] (2) Step S2 of compiling a list of neighborhoods along the line: the network side compiles and numbers a list of neighborhoods along the train running line according to the train number and pre-stored data of the neighborhoods along the line;
[0028] (3) Foresee the upcoming train number. Step S3, the mobility management equipment on the train periodically sends train-related information to the network side during the traveling process, and obtains the time required to reach the next cell by processing the related information. When the time is less than a certain set time threshold, the network side sends a message to the next cell base station to inform it that it is ready to reserve channel resources to serve the upcoming train passengers, and at the same time use the obtained information to count the previous two railway lines The amount of reserved resources of the cellular cell is fed back to the next cell to notify it to reserve reasonable channel resources to avoid waste;
[0029] (4) The base station reserves resources. In step S4, the base station of the next cell recovers the wireless resources in the cell according to the relevant information updated by the train cycle and the pre-stored cell data along the line, and reserves the mobile station to provide services for the train. The amount of reserved wireless resources is determined by the feedback of the reservation information of the previous two railway cells along the line;
[0030] (5) The base station recovers wireless resources. Step S5. When the train leaves the cell for a certain period of time, the cell base station recovers the wireless resources reserved for the train to provide normal communication services for the users of the cell. At the same time, the neighboring cell base stations pass through the overlapping area. The relay station recycles the lent resources;
[0031] (6) Train number cancellation step S6, when the train arrives at the station, the train number cancellation is performed, and the new network-side resource allocation method is no longer applicable after the train number cancellation.
[0032] As a further improvement of the above method, it also includes the following steps:
[0033] (1) The cell user tries to access the step. The user in the cell where the train is about to pass has a communication requirement and sends an access request message to the cell base station;
[0034] (2) The channel borrowing step of the adjacent cell. Since the channel recovery serves the users on the train, the base station of the cell feeds back the information that the channel resource of the cell is full for the cell user, and the cell user tries to send the message to the relay station adjacent to the cell and the surrounding non-railway cell. An access request is made and the feedback information of the base station of the cell is sent to the relay station at the same time. After receiving the access request and the feedback information of the base station, the relay station applies for short-term radio resources from the base station of the adjacent cell.
[0035] As a further improvement of the above method, in the train number registration step, when the train is about to depart, the train movement management device sends a request to register the train number to the network side; the network side returns a confirmation message of successful registration to the train movement management device, If the confirmation message is not received within a certain time limit, the mobile management device continues to send the registration request until the confirmation message from the network side is received.
[0036] As a further improvement of the above method, the train movement management equipment is a train movement station that integrates a GPS, a transceiver and an information collection device.
[0037] As a further improvement of the above method, the train travel related information in (3) includes: train travel speed, train location, distance to the next cell, train number and stop information, and information obtained by trains in the previous two railway cell cells The amount of wireless resources, etc.
[0038] As a further improvement of the above method, in the step of reserving resources by the base station, it is proposed that the priority of users on the train is higher than that of cell users.
[0039] Below, take the T9 train as an example, combined with figure 1 , 2 3. Explain the general flow of wireless channel allocation in the cellular cells along the railway.
[0040] Reference figure 1 , 2 And 3.
[0041] Step 1T9 before the departure of the train, the train mobile station completes the registration of the train number.
[0042] Step 2 The network side compiles a list of communities along the train operation. Assuming that 26 cells are passed along the way, these 26 cells are numbered. When the train mobile station establishes communication in cell 1, the network side sends information such as the upcoming train to the base station of cell 2 according to the compiled list of the cells along the train operation.
[0043] Step 3 Assuming that the T9 train moves from cell 2 to cell 3, the mobility management equipment on the train periodically sends train driving information to the network side during the traveling process, including train speed, train location, and distance to the next cell , Train times and stop information, and the amount of wireless resources obtained by the trains in the cell cells along the previous two railways. Through calculating and processing the data, the time required to reach the cell 3 is obtained. When this time is less than a certain set time threshold, the network side sends a message to the cell 3 base station to inform it that it is ready to reserve channel resources to serve passengers on the upcoming T9 train. At the same time, the amount of information reserved for cell 1 and cell 2 is counted and fed back to cell 3 to notify them to reserve reasonable channel resources. The network side recovers the wireless resources in the cell according to the relevant information updated on the train cycle and the pre-stored cell data along the line, and reserves the mobile station for the train to provide services. Wherein, the amount of reserved radio resources is determined by feedback of the reservation information of cell 1 and cell 2. User 6 in cell 3 has a communication requirement and sends an access request message to cell 3 base station; because the channel is recovered to serve the train mobile station, cell 3 base station feeds back information that the channel resource is full for the user in this cell, and cell 3 user tries to communicate with the cell The relay station 5 adjacent to the cellular cell along the non-railway makes an access request and sends feedback information of the cell base station to the relay station 5 at the same time. After receiving the access request and the feedback information of the base station, the relay station 5 applies for short-term wireless resources to the neighboring cell base station 4 not along the railway line to provide temporary communication services for the cells along the train line. When the train leaves the cell 3 for a certain period of time, the cell 3 base station recovers the wireless resources reserved for the train, and provides normal communication services for users in the cell. At the same time, the base station 4 of the neighboring cell not along the railway line recovers the lent resources through the relay station 5 of the overlap area.
[0044] Step 4 When the T9 train arrives at the station, the train mobile station will cancel the train number. After logging off, the new network-side resource allocation method is no longer applicable.
[0045] The above is a detailed introduction to a new wireless channel allocation method based on the cell along the train provided by the present invention. Specific embodiments are used in this article to explain the principle and implementation of the present invention. The description of the above embodiments is only for help Understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and the scope of application. In summary, the content of this specification should not be construed as limiting the present invention.
