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Cell selection or cell reselection method of a terminal

A technology of cell reselection and cell selection, applied in the direction of nan, electrical components, wireless communication services, etc., can solve the problems of ping-pong and other problems, and achieve the effect of avoiding ping-pong phenomenon

Active Publication Date: 2011-03-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the terminal is triggered to leave the cell because of whether it supports emergency calls, the terminal will soon follow the general cell selection or reselection rules and return to the original cell, resulting in a ping-pong phenomenon

Method used

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  • Cell selection or cell reselection method of a terminal
  • Cell selection or cell reselection method of a terminal
  • Cell selection or cell reselection method of a terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Reference figure 2 and image 3

[0030] In an acceptable cell of E-UTRAN where the terminal in "camp on any cell" resides. The terminal knows that the current cell does not support the IMS emergency call by obtaining the system information of the cell, so the terminal cannot obtain the emergency call service in the current cell. However, the terminal itself supports voice services in the circuit domain, and the current E-UTRAN cell overlaps with the network supporting the radio access technology in the circuit domain, so the terminal cell selects or reselects to CS RAT. After completing cell selection or reselection, if the terminal remains in the "camp on any cell" state in the cell of CS RAT and tries to reselect an acceptable cell of E-UTRAN, the acceptable cell is considered The cell reselection priority of the frequency where it is located is the lowest, which is lower than the cell reselection priority (0-7) stipulated in the specification.

Embodiment 2

[0031] Embodiment two: reference Figure 4

[0032] The application scenarios of the second embodiment are the same as those of the first embodiment, except that the terminal does not support voice services in the circuit domain. In this case, the terminal chooses to obey the general cell selection or reselection rules in the "camp on any cell" state, that is, the terminal will not trigger cell selection or reselection because the cell does not support IMS emergency calls. Behavior.

Embodiment 3

[0033] Embodiment three: reference Figure 5

[0034] In the embodiment, the terminal in "camp on any cell" resides in an acceptable cell of E-UTRAN. The terminal knows that the current cell does not support the IMS emergency call by obtaining the system information of the cell, so the terminal cannot obtain the emergency call service in the current cell. Although the terminal itself supports voice services in the circuit domain, because the signal of the CS RAT cell overlapping with the E-UTRAN cell is too weak to meet the acceptable conditions defined in the specification corresponding to the CS RAT, the terminal Without cell selection or reselection to the cell of the CS RAT, that is, to continue to reside in the current cell of the E-UTRAN.

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Abstract

The invention relates to a cell selection or reselection method between wireless access technologies or in the wireless access technology, in particular to a cell selection or cell reselection method of a terminal, wherein the terminal is in a limited service state and supports a circuit switch domain service, and the current cell of the terminal does not support emergency calls. The cell selection or cell reselection method is characterized by comprising the steps of: carrying out cell selection or cell reselection by the terminal to select a wireless access technological cell supporting the circuit switch domain service; carrying out the cell selection or cell reselection once again by the terminal after the cell selection or cell reselection, if a selectable wireless access technological cell is an acceptable cell, judging that the cell, in which the frequency of the acceptable cell is located, has the lowest priority, and if the selectable wireless access technological cell is a proper cell, submitting to the cell broadcast in a system message of a current resident cell and reselecting priority, by the terminal. By adopting the technical scheme of the invention, the ping-pong phenomenon of the terminal between two wireless access technological cells is avoided.

Description

technical field [0001] The present invention relates to the field of mobile communication technology, in particular to a cell selection and reselection method between radio access technologies or within radio access technologies. Background technique [0002] In a Wideband Code Division Multiple Access (WCDMA) system, emergency calls before Release 9 (Release 9) released by 3GPP are based on Circuit Switch (CS, also referred to as circuit domain) to achieve. Starting from Release 9 of 3GPP, an emergency call based on packet switching domain services has been introduced. More precisely, this new emergency call adopts VoIP (voice over IP) technology, and requires the terminal and the core network to support IMS (Multimedia Subsystem, IP Multimedia Subsystem, referred to as IMS) service. This new emergency call is referred to herein as an IMS emergency call. [0003] Since IMS has not been maturely applied in industry, not all operators support IMS emergency calls. In LTE (...

Claims

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Application Information

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IPC IPC(8): H04W4/22H04W48/20H04W4/90
Inventor 杜忠达王雪飞吴昊黄亚达
Owner ZTE CORP
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