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Method and device for allocating low frequency-band frequency spectrum resources for TDD system

A spectrum resource and allocation device technology, which is applied in the field of allocating low-frequency spectrum resources for a time division duplex system, can solve the problems of destroying the one-to-one correspondence between uplink and downlink carriers, and the system cannot work normally, and achieves the effect of making up for performance loss.

Active Publication Date: 2011-04-20
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

However, since TDD uses time slots to distinguish uplink and downlink transmissions, the TDD carrier will generate cross interference with the adjacent FDD uplink carrier, making the system unable to work normally
In addition, FDD uses asymmetric carrier aggregation, which destroys the traditional one-to-one relationship between uplink and downlink carriers, which will cause many problems. For example, in terms of backward compatibility, traditional FDD users only support fixed uplink and downlink carrier spacing; and For example, in terms of control channels, ACK / NACK signal mapping and random access processes need to be greatly modified.

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Embodiment Construction

[0032] It should be noted that the technical solution of the present invention is based on the use of symmetric carrier aggregation technology in the FDD system, so that the aggregated uplink and downlink carriers can maintain a one-to-one correspondence relationship, that is, the uplink and downlink carriers can maintain both bandwidth and number. unanimous.

[0033] The FDD system uses symmetric carrier aggregation technology in the low frequency band to aggregate uplink carriers (uplink low frequency spectrum resources) and downlink carriers (downlink low frequency spectrum resources) in a symmetrical manner. When the uplink traffic and downlink traffic of the FDD system are asymmetrical, for example, when the downlink traffic of the FDD system is greater than the uplink traffic, all the downlink low-band spectrum resources aggregated by the symmetrical carrier aggregation technology are allocated to the FDD system to transmit downlink data; The aggregated uplink low-band s...

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Abstract

The invention provides a method and a device for allocating low frequency-band frequency spectrum resources occupied by a frequency division duplex (FDD) system for a time division duplex (TDD) system in a communication system. The method comprises the following steps of: firstly, performing symmetric carrier aggregation on the FDD system in a low frequency band to generate aggregated low frequency-band frequency spectrum resources with symmetric uplink and downlink; secondly, determining an uplink traffic volume and a downlink traffic volume of the FDD system; thirdly, allocating the aggregated uplink low frequency-band frequency spectrum resources to the TDD system in partial time slots if the downlink traffic volume of the FDD system is greater than the uplink traffic volume of the FDDsystem, and allocating the resources to the FDD system in the residual time slots; and fourthly, allocating the aggregated downlink low frequency-band frequency spectrum resources to the TDD system in partial time slots if the uplink traffic volume of the FDD system is greater than the downlink traffic volume of the FDD system, and allocating the resources to the FDD system in the residual time slots.

Description

technical field [0001] The present invention relates to a communication system, and in particular to a method and a device for allocating low frequency spectrum resources for a Time Division Duplex (TDD) system in the communication system. Background technique [0002] The B3G mobile communication system will support two modes of frequency division duplex (Frequency Division Duplex, FDD) and time division duplex (Time Division Duplex, TDD). Among them, FDD is transmitted on two separate symmetrical channels, which requires paired spectrum, and uses a guard frequency band to separate uplink and downlink data. When FDD supports symmetrical services, it can make full use of the uplink and downlink spectrum, but when it supports asymmetric services, the spectrum utilization rate will be greatly reduced. TDD is to transmit on the same channel and use time to separate uplink and downlink data. TDD can flexibly configure the frequency spectrum, and can also support asymmetric ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/14H04W72/04
Inventor 梁学俊刘扬段军王泽权李剑
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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