Method for realizing cross-zone handoff in TD-SCDMA multi-frequency point cell

A TD-SCDMA, handover technology, applied in the field of handover, can solve the problems of co-frequency interference, communication interruption in the handover area, and the inability of TD-SCDMA network to use soft handover technology, so as to ensure communication quality and avoid co-frequency. the effect of interference

Inactive Publication Date: 2010-05-12
ZTE CORP
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AI Technical Summary

Problems solved by technology

However, in the case of co-frequency networking (adjacent cells use the same frequency point for communication), co-frequency interference still exists in the business time slots in the overlapping coverage areas of adjacent cells. serious
Although TD-SCDMA uses CDMA technology in time slots, due to the limited spread spectrum gain in each time slot, and TDD system requires strict synchronization of uplink and downlink, TD-SCDMA network cannot use soft handover technology
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.

Method used

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  • Method for realizing cross-zone handoff in TD-SCDMA multi-frequency point cell
  • Method for realizing cross-zone handoff in TD-SCDMA multi-frequency point cell
  • Method for realizing cross-zone handoff in TD-SCDMA multi-frequency point cell

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Embodiment Construction

[0037] The present invention assumes that the TD-SCDMA multi-frequency point cell system configures mutually orthogonal wireless resources for the outer areas of adjacent cells, which are called handover reserved resources hereinafter. The mutual orthogonality means that the handover reserved resources or time slots or frequency points of adjacent cells are staggered from each other.

[0038] Taking the cellular network organized by TD-SCDMA multi-frequency cells as an example, the implementation of the handover method proposed by the present invention in conjunction with time slot scheduling will be described in detail below.

[0039] like Figure 6 shown. In a multi-frequency point cell system, the handover reserved resources can be unified on the same carrier, or can be allocated on different carriers. The number of specific reserved resources needs to be flexibly configured according to the requirements of the switching traffic. In this embodiment, it is assumed that th...

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Abstract

A method to realize interval switch in TD-SCDMA multi-frequent dot section is disclosed, the terminal station detects the receiving power of P-CCPCH in service section and adjacent sections, and evaluates the signal-to-noise ratio of service channel based on the receiving power of P-CCPCH; and decide to switch according to the state of signal-to-noise ratio. The invention uses the characteristicsof TD-SCDMA multi-frequent dot section, and the wireless source of TD-SCDMA is divided by time, and the co-frequency interference are produced on the boundary of honeycomb section, it can reduce the co-frequency interference effectively to ensure the communication quality when the mobile user does interval switch.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a handover method in a TD-SCDMA 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 the terminal stations 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 user terminal stations. [0003] figure 2 A typical cellular wireless communication system architecture is given. A typical wireless cellular communication system usually includes a base station system (inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/04H04W36/30H04W36/06
Inventor 吴岩巍
Owner ZTE CORP
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