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Method for improving service efficiency of special leader sequence and terminal switching method

A preamble sequence and terminal technology, applied in connection management, wireless communication, electrical components, etc., can solve the problems of reduced terminal handover success rate, protocol failure, asynchrony, etc., and achieve the effect of improving terminal handover success rate and improving use efficiency.

Inactive Publication Date: 2009-11-04
ZTE CORP
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Problems solved by technology

[0012] The above method requires a condition that the SFNs of the source cell and the target cell are synchronized, but in actual applications, the SFNs of the target cell and the source cell may not be synchronized, and the terminal no longer reads the SFN of the target cell during the handover process, so Use the SFN of the target cell to limit the effective use time of the dedicated preamble allocated by the target cell, which may lead to the failure of the agreement between the two parties and reduce the success rate of terminal handover

Method used

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  • Method for improving service efficiency of special leader sequence and terminal switching method
  • Method for improving service efficiency of special leader sequence and terminal switching method
  • Method for improving service efficiency of special leader sequence and terminal switching method

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Embodiment Construction

[0028] The dedicated preamble is a scarce resource in the LTE system. In the method of the present invention, during the handover process of the terminal from the source cell to the target cell, the target cell sets the dedicated preamble and the effective duration of using the dedicated preamble for the terminal. The effective duration is calculated from the first time the terminal sends a random access preamble message in the target cell. The timer T2 is introduced into the terminal and the target cell to control the effective use time of the dedicated preamble, so that the time when the terminal stops using the preamble is synchronized with the time when the target cell releases the preamble used by the terminal, thereby improving the use efficiency of the dedicated preamble and the terminal switching success rate.

[0029] Such as image 3 As shown, the method for the terminal to switch using a dedicated preamble specifically includes the following steps:

[0030] Step 3...

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Abstract

The invention discloses a method for improving the service efficiency of a special leader sequence, comprising the following steps: when a terminal switches from a source cell to a target cell, the target cell sets the special leader sequence and a valid time length using the special leader sequence; the terminal uses the special leader sequence during the period of the valid time length to launch random access in the target cell; and the valid time length is calculated when the terminal firstly launches the random access leader message in the target cell. The method ensures that the time for the terminal to stop using the leader sequence is synchronous with the time for the target cell to release the leader sequence used by the terminal, thereby improving the service efficiency of the leader sequence and the terminal switch success ratio.

Description

technical field [0001] The present invention relates to a long term evolution (LTE, Long Term Evolution) mobile communication system, in particular to a method for improving the use efficiency of a dedicated preamble sequence and a terminal switching method. Background technique [0002] Such as figure 1 As shown, the LTE system mainly includes: a core network CN (Core Network) and an evolved universal terrestrial radio access network E_UTRAN (Evolved Universal Terrestrial RadioAccess Network), and the core network mainly includes: a mobile management entity (MME, Mobility Management Entity) / service gateway S-GW (Serving GateWay): The evolved universal terrestrial wireless access network is composed of evolved node B (eNodeB). The core network and the access network are interconnected through the S1 interface. The interface is interconnected and interoperable. The core network is responsible for interconnection with other communication systems, bearer management, authentic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/08H04W74/08H04W76/06
Inventor 张现周杜忠达
Owner ZTE CORP
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