Cross-zone handover method for time division synchronous CDMA multi-frequency-point cell cellular network

Abstract

The invention discloses a handover method in a time division synchronous code division multiple access multi-frequency cell cellular network, comprising the following steps: configuring the wireless resources of each cell into two types of handover reserved resources and non-handover reserved resources, And make the handover reserved resources of adjacent cells orthogonal to each other; when the terminal communicates on the handover reserved resources of the serving cell, if it detects that the signal-to-noise ratio of the received signal in the neighboring cell is better than that of the serving cell, it will report the message to the base station of the serving cell ; The base station of the serving cell instructs the user to switch to the handover reserved resources of the adjacent cell, the adjacent cell becomes the serving cell of the terminal, the original serving cell becomes the adjacent cell, and the handover is completed. The invention can effectively reduce the same-frequency interference level at the edge of the cell, thereby ensuring the communication quality of the mobile user in the handover process.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a handover method in a time division synchronous code division multiple access multi-frequency cell cellular network. Background technique [0002] Cellular networking is the most common networking method for wireless communication. The network topology is as follows: figure 1 shown. Because the network topology resembles a honeycomb structure, it is named cellular network. Each cellular unit in the cellular network represents the coverage area of ​​a base station transceiver, and mobile terminals in this area can establish a wireless communication link with the base station. Multiple transceivers form a network to achieve continuous coverage of an area and provide ubiquitous and continuous wireless communication services for mobile terminals of users. [0003] figure 2 A typical cellular wireless communication system architecture is given. A typical wireless cellular ...

AI Technical Summary

Problems solved by technology

However, in the case of co-frequency networking (neighboring cells use the same frequency point for communication), co-frequency interference still exists in the service time slots of overlapping coverage areas of adjacent cells, and the more cells with overlapping coverage, the greater the co-frequency interference. serious

Although TD-SCDMA adopts CDMA technology in time slots, the application of soft handover technology in TD-SCDMA networks is limited due to the limited spread spectrum gain in each time slot, and the TDD system requires strict synchronization of uplink and downlink.

Therefore, in a wireless network composed of multi-frequency cells, the same-frequency interference received by service time slots at the cell border will seriously affect the communication quality of mobile users, and even cause communication interruption in the handover area.

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