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Apparatus and method for efficient inter radio access technology operation

A receiver and frequency bandwidth technology, which is applied in the field of communication systems, can solve the problems of expensive, complex operation between RATs, etc.

Active Publication Date: 2009-04-22
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This two-receiver approach is expensive from a terminal perspective
[0006] Due to the possibility of handover to WCDMA / GSM on the same or adjacent carrier frequencies with different bandwidths, the complexity of inter-RAT operations is expected to be greater with Beyond 3G compared to inter-RAT operations in WCDMA / GSM

Method used

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  • Apparatus and method for efficient inter radio access technology operation
  • Apparatus and method for efficient inter radio access technology operation
  • Apparatus and method for efficient inter radio access technology operation

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Embodiment Construction

[0018] Embodiments of the present invention provide a terminal with a front-end receiver that is operable across a bandwidth that is large enough to cover the entire bandwidth used by the access technology supported by the terminal. For example, in the case of Super 3G (S3G), the front-end receiver should be operable across the entire 20 MHz bandwidth used by the OFDM signal, and therefore be able to receive a bandwidth larger than the bandwidth of GSM (200 kHz) and WCDMA (5 MHz). In this way, the present invention makes it possible to use only a single front-end receiver to perform HO measurement and cell search with respect to one access technology, and at the same time support ongoing operations on another access technology without interruption. Communication session. HO measurement and cell search can also be performed simultaneously on different access technologies and different carrier frequencies, which can reduce the search time.

[0019] FIG. 1A graphically illustrates th...

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PUM

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Abstract

Disclosed is an apparatus, and a method performed by the apparatus, including a terminal with a front end receiver and analog filter (AF) operable throughout a bandwidth that is large enough to cover the total bandwidth used by different access technologies that the terminal supports. The terminal is operable to simultaneously extract from the output of a single front end receiver and AF the carrier frequencies and bandwidths of the different access technologies. This permits cell evaluation activity and an ongoing communication session to be conducted simultaneously with different access technologies on different bandwidths within the bandwidth of the analog filter and without interruption of the communication session.

Description

Technical field [0001] The present invention generally relates to communication systems, and more specifically, to inter-radio access technology (RAT) operation in at least one communication system. Background technique [0002] In the upcoming evolution of cellular standards such as GSM and WCDMA, the use of additional modulation techniques such as Orthogonal Frequency Division Multiplexing (OFDM) may be expected. A proposal called Super 3G or S3G can be seen as an evolution of the 3G WCDMA standard. Super 3G will most likely use OFDM as the modulation technology, and will likely operate at a data rate of up to 100 megabits per second (Mb / s) across a bandwidth spanning between 1.25 MHz and 20 MHz. Therefore, for a smooth migration from the existing radio spectrum of the "old" cellular system to a new high-capacity, high-data-rate cellular system, the user equipment will need to be able to operate on a flexible bandwidth. [0003] Therefore, the evolution of cellular standards wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04B1/28
CPCH04B1/001H04W88/06H04B1/28H04B1/406H04W36/30H04W36/14H04W36/302H04B1/401
Inventor B·林多夫J·尼尔森
Owner TELEFON AB LM ERICSSON (PUBL)
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