Method and system for improving uplink feedback capability of TDD system

Abstract

The invention relates to a method for increasing feedback capacity of an uplink of a time division duplex system, which includes the following steps: step 1 within an uplink time slot of a wireless frame on a bidirectional spectrum in the time division duplex system and on the bidirectional spectrum, a terminal sends signals to a base station; step 2 within a time slot of a wireless frame on a downlink unidirectional spectrum which is corresponding to the uplink time slot in the time division duplex system and on the downlink unidirectional spectrum, the terminal receives feedback information sent by the base station. The invention can allow the feedback delay of the time division duplex system to be smaller than a period of a wireless frame, thus shortening the delay of power control, channel information feedback and dynamic dispatching on the uplink in the time division duplex system and greatly increasing the throughout capacity of the uplink in the time division duplex system as well as the support capacity for a high-speed mobile terminal. By adopting the invention, the time division duplex system keeps the inherent advantages and further has the advantages of small delay for closed loop control in an FDD system and support of high-speed movement.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and a system for improving the uplink feedback 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, and its working method is as follows 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 slo...

AI Technical Summary

Problems solved by technology

[0007] In the existing TDD system, the period T0 of the wireless frame limits the feedback frequency of the system closed-loop work. For example, the issuing and scheduling period of the power control command is limited by the period T0 of the wireless frame, so that the TDD system can control the high-speed mobile terminal. The support capability and system delay are not as good as the FDD system

The disadvantage of introducing a spectrum structure of a dedicated downlink broadcast spectrum in addition to the spectrum of the existing cellular mobile communication system is that the newly introduced dedicated downlink spectrum and the spectrum of cellular mobile communication work in a relatively independent manner, and the dedicated downlink spectrum cannot be used as a Potential for Feedback Channels

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