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Method and system for improving downlink feedback capability of TDD system

A capability and feedback information technology, applied in the field of communication, can solve the problems of not utilizing the potential of the dedicated downlink spectrum feedback channel, limiting the system throughput, and further improving the support capability of high-speed mobile terminals, so as to improve throughput, improve support capabilities, and reduce Effects of Scheduling Latency

Inactive Publication Date: 2008-07-02
ZTE CORP
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In the prior art, the cycle T0 of the wireless frame limits the feedback frequency of the system closed-loop work. For example, the transmission of power control commands, the cycle of wireless resource scheduling, and the feedback of channel state information are all limited by the cycle T0 of the wireless frame, which limits the throughput of the system. Further improvement in capacity and support for high-speed mobile terminals
The current dual-mode terminals use TDD spectrum and FDD spectrum in a relatively independent manner, and have not utilized the potential of dedicated downlink spectrum as a feedback channel

Method used

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  • Method and system for improving downlink feedback capability of TDD system
  • Method and system for improving downlink feedback capability of TDD system
  • Method and system for improving downlink feedback capability of TDD system

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Embodiment Construction

[0032] In the present invention, the "two-way spectrum" refers to the spectrum used in two directions, that is, the spectrum is used for uplink transmission and downlink transmission in a time-division manner, and the unpaired spectrum used in the existing TDD system is a two-way spectrum;

[0033] The narrow concept of the "uplink unidirectional spectrum" is the spectrum used only to transmit uplink signals, for example, the uplink spectrum used by the frequency division duplex (FDD: Frequency Division Duplex) system is the uplink unidirectional spectrum; "uplink unidirectional spectrum "The broad concept refers to the frequency spectrum that can be used for uplink transmission during the downlink time slot in the TDD system radio frame. For example, two TDD systems A and B use two-way spectrum work. The uplink and downlink time slots of B are staggered in time, so that the uplink time slot of wireless frame A corresponds to the downlink time slot of wireless frame B, then the...

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Abstract

The invention relates to a feedback method for increasing downlink ability in a time division duplex system, which comprises the following steps: step 1, a terminal receives signals of a base station on bidirectional spectrum, which is used for receiving business data or control information; step 2, the terminal sends feedback information to the base station on uplink unidirectional spectrum. The invention can remarkably increase the power control frequency of the downlink in a TDD system and can remarkably reduce the scheduling delay of the TDD system. Furthermore, the invention effectively increases the throughput of the downlink in the TDD system and increases the supporting ability of the TDD system to a high-speed mobile terminal. The invention has the advantages of channel reciprocity and simple terminal structure on one hand, on the other hand has an FDD system with small closed ring control delay and a TDD downlink system which supports high-speed mobile advantage.

Description

technical field [0001] The invention relates to the communication field, in particular to a feedback method and system for improving the downlink capability of a TDD (Time Division Duplex) system. Background technique [0002] The existing TDD system uses unpaired two-way spectrum 101 for uplink and downlink two-way communication in a time-division manner, such as figure 1 shown. f1-f2 in the figure is the frequency spectrum width used bidirectionally by the TDD system (referred to as bidirectional frequency spectrum here). In this unpaired frequency spectrum 101, the public broadcasting signal, control signal, and service signal of the system are all based on the radio frame cycle Work alternately. The period T0 of the wireless frame is generally 10ms, or 5ms. The period T0 of the wireless frame is further subdivided into two types of time slots: uplink and downlink. The uplink time slot includes synchronization time slot and business time slot, while the downlink time sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04Q7/38
Inventor 刁心玺陈冠
Owner ZTE CORP
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