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Realizing FDD capability by leveraging existing TDD technology

A scheduling table and cellular communication system technology, applied in the field of realizing FDD capability by adjusting the existing TDD technology, can solve a large number of problems, time-consuming and laborious debugging process, WiMAX mode only supports TDD communication, etc., to reduce costs and reduce terminal costs Effect

Inactive Publication Date: 2013-12-04
ALCATEL-LUCENT USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The FDD option as described in 802.16e requires a time-consuming and labor-intensive commissioning process, and if this option is to be implemented, it will require a lot of effort and time to define and develop the system as it is very different from the current WAVE1 and WAVE2 WiMAX Time Division Duplex (TDD) mode
[0002] Therefore, the main disadvantage of the traditional WiMAX mode is that it only supports TDD communication

Method used

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  • Realizing FDD capability by leveraging existing TDD technology
  • Realizing FDD capability by leveraging existing TDD technology
  • Realizing FDD capability by leveraging existing TDD technology

Examples

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Embodiment Construction

[0020] The present invention relates to a method and apparatus for adapting existing TDD ASICs, software and infrastructure to provide FDD communication capability by switching 802.16e defined WiMAX TDD carriers between two transmission frequency bands in a frame, thereby enabling TDD carriers as semi Duplex FDD carrier work.

[0021] Although the present invention is directed to, and thus described with specific reference to, the field of cellular communications, it will be appreciated that the present invention may also be useful in other fields and applications. For example, the present invention may be used in communication devices, gaming devices, or other devices where it is desired to increase frequency reuse, reduce collisions, and the like.

[0022] Referring now to the drawings, which are shown for illustrative purposes only and are not intended to limit the claimed subject matter, figure 1 Illustrated is a system providing frequency division duplex (FDD) communicat...

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Abstract

Systems and methods are disclosed for using two TDD carriers in the same paired spectrum by offsetting the DL and UL transmissions in frequency to cause the TDD carriers to behave as two half-duplex FDD carriers. DL and UL transmission and reception periods are predefined such that only one of the TDD carriers is transmitting on the DL at any instant in time while the other TDD carrier is transmitting on the UL.

Description

Background technique [0001] As background, the existing conventional Worldwide Interoperability for Microwave Access (WiMAX) mode does not support Frequency Division Duplex (FDD) communication protocols. The 802.16e standard mentions the FDD option, but this FDD option in 802.16e requires a completely new frame structure (eg, ASIC and software). The FDD option as described in 802.16e requires a time-consuming and labor-intensive commissioning process, and if this option is to be implemented, it will require a lot of effort and time to define and develop the system as it is very different from the current WAVE1 and WAVE2 WiMAX Time Division Duplex (TDD) mode. [0002] Therefore, the main disadvantage of the traditional WiMAX mode is that it only supports TDD communication. In many new frequency bands (eg AWS and 700MHZ in the US), TDD technology is basically limited because these are paired frequency bands and want to support FDD technology. [0003] There remains a need in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26
CPCH04W84/042H04B7/2615H04L5/14H04W72/1257H04W72/535
Inventor J·M·格雷比尔J·P·西摩
Owner ALCATEL-LUCENT USA INC