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Handover method applied to high-speed railway

A high-speed railway and high-speed rail technology, applied in electrical components, wireless communication, etc., can solve problems such as easy drop-offs, and achieve the effect of improving the success rate of switching

Inactive Publication Date: 2011-12-14
TD TECH COMM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the previous findings of the same-frequency handover test of the high-speed rail system, the power control mechanism can use the closed-loop mechanism to reduce the uplink and downlink transmission power to a stable level after tens of milliseconds after switching to the target cell. It is easy to drop calls when switching between multiple users

Method used

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  • Handover method applied to high-speed railway
  • Handover method applied to high-speed railway

Examples

Experimental program
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Effect test

Embodiment 1

[0040] This embodiment is applicable to the scenario of inter-frequency handover, that is, the source cell and the target cell are inter-frequency cells.

[0041] In this embodiment, when the network side judges that the first N users who are in the front position in a row of high-speed rail need to switch, a switch command is sent to the N users, so that the switch between the N users maintains the preset At the same time, it decides to initiate blind switching to other subsequent users, that is, to initiate switching commands to these blind switching users, and to keep the preset switching execution interval between blind switching users. Of course, a handover execution interval also needs to be maintained between the first blind handover user and the last user among the N users. Here, the network side can infer the order of the user's location based on the frequency offset reported by the user or the order of switching to the new path (PATH). time interval execution. figu...

Embodiment 2

[0047] This embodiment is applicable to the scenario of inter-frequency handover, that is, the source cell and the target cell are inter-frequency cells.

[0048]This embodiment does not optimize the decision-making mechanism for initiating handover in the existing high-speed rail system (that is, according to the existing technology, it is determined whether to handover the corresponding UE according to the measurement report reported by each UE), and it is only mandatory to ensure that all handover commands are in the interference mode. It is issued before the lift, and the preset switching execution interval is maintained between the switching of each user. If the switching execution interval is not reached, the switching execution will be postponed.

[0049] In this embodiment, since the time interval for each UE to report a measurement report is uncontrollable, the total switching time of the whole vehicle is longer than that in Embodiment 1.

Embodiment 3

[0051] This embodiment is applicable to a scenario of same-frequency handover, that is, the source cell and the target cell are same-frequency cells.

[0052] In order to minimize the time for users to interfere with each other before and after handover between the source cell and the target cell during the handover process of the group, all users are required to handover at the same time in this embodiment. The specific implementation methods can be as follows:

[0053] For example: when the RNC receives the measurement report reported by the first user, according to the collected user speed and the time sequence of changing PATH, calculate the location center of the user who is the most front user and the user who is the last user. Set the time point Tho of the switching zone, and then issue switching commands to all users, and set the ACTIVATION TIME in all switching commands to Tho, and all switching commands are issued before the interference has not yet risen.

[0054] ...

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Abstract

The present invention provides a handover method applied to high-speed railways. The method is applicable to the scene of inter-frequency handover. The method includes: when the network side judges that the first N users in the front position of the high-speed railway need to be handed over, Send switching commands to these N users, keep the preset switching execution interval between the switching of these N users, and initiate blind switching to other users in the high-speed rail, so that the switching of each user maintains the The preset handover execution interval, in the present invention, all handover commands are issued before the disturbance is raised. The present invention also provides another high-speed railway switching method suitable for different-frequency switching scenarios, and two high-speed railway switching methods suitable for same-frequency switching scenarios. Applying the invention can improve the handover success rate of users in high-speed railways.

Description

technical field [0001] The invention relates to high-speed railway communication system technology, in particular to a switching method applied to high-speed railway. Background technique [0002] In the high-speed railway communication system, when users switch, because they are in the same train, the switching will occur intensively. In this way, the success rate of switching is not easy to guarantee. Therefore, it is necessary to study the problem of user group switching. [0003] According to previous tests, the inventor of the present application found the following problems: [0004] The UE handed over to the target cell uses open-loop power control. At this time, the user must be at the edge of the cell, causing the UE to transmit with high power; high-speed rail recommends using hard handover, and Node B also uses high-power transmission for accessing users; after handover After that, the uplink and downlink transmit power can be reduced only through closed-loop pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/10H04W36/28H04W36/32
Inventor 张力强王健康朱向华李国栋赵渊王伟华
Owner TD TECH COMM TECH LTD
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