Feedback enhanced tdd system and air interface, feedback method and terminal access method

Abstract

The invention discloses a feedback enhanced time division duplex system, comprising at least one base station, at least one terminal, and a bidirectional frequency spectrum and a frequency spectrum for a feedback channel used for communication between the base station and the terminal, wherein the bidirectional frequency spectrum is in a time division duplex manner Spectrum used; the spectrum used for the feedback channel includes at least one of the following: a downlink unidirectional spectrum used for the base station to send feedback signals to the terminal, and an uplink unidirectional spectrum used for the terminal to send feedback signals to the base station. In addition, the invention also discloses a feedback-enhanced air interface, a feedback method, and a terminal access method. By using the present invention, the signal feedback interval can be freed from the limitation of the wireless frame cycle, and the transmission time delay can be reduced and the access speed can be accelerated.

Description

technical field [0001] The present invention relates to the communication field, in particular to an air interface structure and method with an out-of-band feedback channel, in particular to a feedback-enhanced time-division duplex system, a feedback-enhanced air interface, a feedback method, and a feedback-enhanced time-division duplex system. A terminal access method. Background technique [0002] The duplex mode is one of the characteristics that distinguish the traditional wireless system, and it is also a basic factor that determines the basic capabilities of the wireless system. Many performances of the system are closely related to the duplex mode adopted. The above-mentioned performance can be, for example: 1) the system 2) The complexity of terminals and base stations; 3) The ability to use channel information; 4) Networking capabilities; 5) The ability to interoperate between networks; [0003] At present, there are three main duplex modes used in the communicatio...

AI Technical Summary

Problems solved by technology

The main disadvantages of the TDD method are: 1) When the coverage area is too large, the spectrum utilization efficiency is lower than that of the FDD method; 2) It is not as good as the FDD method in supporting high-speed mobile

The main disadvantages of FDD are: 1) It requires paired spectrum, which brings difficulties in spectrum planning; 2) It is difficult to use the channel reciprocity feature, which makes the design of smart antennas more difficult; 3) The use of uplink and downlink spectrum is in support Not flexible enough for asymmetric business

[0014] The disadvantages of the No. 200610171582.5 application titled "A Method for Improving the Uplink Feedback Capability of a Time Division Duplex System" and No. 200610171582.5 titled "A Method for Improving the Downlink Feedback Capability of a Time Division Duplex System" are: From the perspective of TDD system evolution, the feedback enhancement method is discussed, but the method of using the FDD spectrum by the TDD feedback enhanced air interface structure evolved from the FDD system is not given; nor is it clearly stated that the TDD feedback enhanced air interface structure brings simplification to spectrum planning and use.

[0015] Therefore, the disadvantages of the currently used hybrid duplex technology are: 1) the limitation of the TDD frame structure on the feedback delay still exists; 2) the limitation of FDD in the ability to support asymmetric services still exists; 4) does not alleviate the difficulties faced in finding and allocating paired spectrum

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