Method and system for CDMA system terminal to realize remote switch under TDD
A system terminal and long-distance technology, which is applied in the transmission system, code division multiplexing system, electrical components, etc., can solve the problems that have not been raised, and achieve the effect of increasing the probability of successful switching
Inactive Publication Date: 2008-06-04
BEIJING XINWEI TELECOM TECH
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Problems solved by technology
Apparently, the prior art and related literature only provide a principled description of the criteria that the system should follow when selecting handovers, and do not propose a method for maximizing the use of system resources and how to use system resources to support more distant base stations. Especially for the CDMA system under TDD, how to realize the optimization and adjustment of system resources to support the handover between farther base stations under the comprehensive consideration of various situations is not proposed
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[0051] The specific implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0052] Before elaborating the present invention in detail, a brief description of the hard handover process of the CDMA system will be given below. Among them, the conditions for handover to occur are: between disjoint base station (BS) sets (that is, between different CDMA operators), between different active sets, between different frequency bands, between different frequency points, or between different CDMA operators. between frame offsets. The main workflow is as follows:
[0053] Step 1: BS and mobile terminal (MS) communicate on the original traffic channel; when the mobile switching center of BS decides to let MS search different active sets on the same frequency or the same active set on different frequencies, send a message with A message of parameters such as activation set power (that is, a candidate frequency sear...
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The invention relates to a switch method for realizing long-distance switch of a CDMA system terminal under TDD and s system thereof. The method includes the processes: an MDM judges whether the terminal supports the long-distance switch or not; the MDM searches and monitors adjacent frequency base stations in the range of added synchronous searching; the MDM calculates the distance between the current terminal and the adjacent frequency base stations according to monitoring results of the adjacent frequency base stations; an MCU selects a target base station which needs to be switched according to the monitoring results of the adjacent frequency base stations and the distance between the current terminal and the adjacent frequency base stations; the MDM selects a distance mode and access parameters to access the target base station according to the distance between the current terminal and the target base station. The system consists of the MDM and the MCU which respectively has a switch-control unit, wherein, the switch-control unit of the MDM includes an adjacent frequency monitoring module, a power estimation module and a distance calculation module. By adopting the invention, the existing system resource can be effectively utilized; the adjacent frequency base stations realizing the current terminal can be effectively searched for and used.
Description
technical field [0001] The present invention relates to a handover method and system for a terminal in a CDMA system to realize long-distance handover, in particular to a handover method and a system for a terminal in a TDD system to realize long-distance handover. Background technique [0002] In the CDMA system under TDD, for example, the handover of the SCDMA system is initiated by the terminal, and the handover mode is hard handover. In the CDMA system under TDD, whether the terminal itself actively selects a better base station or is forced to select a base station, it must go through the signal monitoring phase of the current base station, the search and monitoring phase of adjacent frequency base stations, and the handover phase. During the handover process, the base station plays an auxiliary role. The structure of the handover system for the normal handover of CDMA system terminals under TDD is as follows: figure 1 As shown, in the signal monitoring stage, the mic...
Claims
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Login to View More IPC IPC(8): H04Q7/38H04J13/02H04W36/08H04B1/707H04W36/18H04W56/00
Inventor周殿清吉亚平梁敏李天新
OwnerBEIJING XINWEI TELECOM TECH