In-band perception method based on LTE frequency domain guard band

A guard band and frequency domain technology, applied in the field of in-band sensing based on the LTE frequency domain guard band, can solve the problems of large changes, high cognitive radio costs, and changes in the LTE system frame structure, and achieve the effect of small impact.

Inactive Publication Date: 2013-07-03
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the QP-based method is the most direct sensing algorithm, due to setting several subframes as QP, the LTE system frame structure changes, and a series of impacts caused by transmission interruption (such as HARQ retransmission and feedback signaling changes, etc. ), making the cost of introducing cognitive radio into the LTE system based on the QP method too high, and the changes to the existing standards are too large, so this method is not a very practical solution

Method used

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  • In-band perception method based on LTE frequency domain guard band
  • In-band perception method based on LTE frequency domain guard band
  • In-band perception method based on LTE frequency domain guard band

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Embodiment 1

[0025] This embodiment provides an in-band sensing method based on the LTE frequency domain guard band, which introduces cognitive radio technology into the LTE system, and then uses the inter-system guard band to measure the energy of primary users to achieve in-band sensing. application scenarios such as figure 1 As shown, the scenario where the LTE system and the TV broadcasting system coexist, in this scenario, the UE works in the authorized frequency band allocated by itself on the one hand, and on the other hand, opportunistically uses the spectrum of the TV system through carrier aggregation to improve the data transmission of the UE ability.

[0026] The in-band sensing method based on the LTE frequency domain guard band described in this embodiment specifically includes two processes of energy detection and energy feedback on the guard band. The LTE system bandwidth includes two parts of bandwidth, one part is the transmission bandwidth, and the other part exists as ...

Embodiment 2

[0038] This embodiment provides an in-band sensing method based on the LTE frequency domain guard frequency band, assuming that the frame structure of the guard subcarrier of the synchronization channel in the LTE system applied is as follows image 3 As shown, the synchronization channel in the LTE system is composed of a primary synchronization signal PSS and a secondary synchronization signal SSS. The PSS and the SSS each occupy the central 62 subcarriers of different OFDM symbols, and 5 empty subcarriers are reserved at both ends of the 62 subcarriers as redundancy for system frequency deviation.

[0039] In the above application scenario, the content of the in-band sensing method based on the LTE frequency domain protection frequency band described in this embodiment is: after the downlink receiver of the LTE system receives the downlink signal, after carrier frequency offset compensation, the protection Except for the noise component, there is no other signal on the subc...

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Abstract

The invention provides an in-band perception method based on an LTE (Long Term Evolution) frequency domain guard band, which comprises the steps that: whether a master user signal and a non-LTE secondary user signal exist is comprehensively analyzed and judged according to energy on the intersystem guard band fed back by a user; if only leakage energy and receiver noise are available on the intersystem guard band, the master user signal or the non-LTE secondary user signal does not exist, or else, the master user signal or the non-LTE secondary user signal exists. According to the in-band perception method based on the LTE frequency domain guard band, a data transmission situation of a master user on a perception band can be perceived, data transmission situations of other non-LTE secondary users can also be perceived, a frame structure is not changed, and the influence on the existing LTE system protocol is minimum.

Description

technical field [0001] The invention belongs to the technical field of mobile communication and relates to a sensing method, in particular to an in-band sensing method based on LTE frequency domain guard frequency band. Background technique [0002] The development of wireless communication technology, on the one hand, makes the frequency allocation of the newly introduced wireless transmission system more and more difficult, especially after the introduction of home base station and carrier aggregation technology in the 3GPP LTE system, it is even more difficult to satisfy a large number of spectrum allocations. On the other hand, some existing systems, such as TV systems, have very low frequency spectrum utilization efficiency. For this reason, the frequency domain sensing technology is proposed, and its purpose is to allow the system with tight spectrum utilization to opportunistically perceive and use the spectrum of the system with low spectrum utilization. In spectrum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00
CPCH04W16/14
Inventor 贾国庆杨秀梅胡宏林李海涛朱厚道雷海鹏
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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