Method and system for inducting outer feedback in TDD aerial interface

Abstract

The invention discloses a method for introducing outer zone feedback into a time division duplex air interface. The method comprises the following processes: an air interface structures a service channel on a first unpaired spectrum which is used in a time-division manner in two directions, and the air interface structures a feedback channel and/or a control channel on a second unpaired spectrum which is used in a time-division manner in two directions. In addition, a system which corresponds to the method is also provided. The air interface has the advantages of reserving the channel reciprocity of TDD, the flexibility of downlink and uplink services and the like; in addition, the air interface has various advantages brought by the low feedback latency of half-duplex FDD. In particular, when the air interface is applied to the double layer and double frequency wireless access network, the capability of supporting a high-speed mobile terminal of a micro-cell wireless contact can be improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and system for introducing external feedback into a time-division duplex air interface. Background technique [0002] The duplex mode is one of the characteristics that distinguish the traditional wireless system, and it is also a major factor that determines the basic capabilities of the wireless system. Many performances of the system are closely related to the duplex mode adopted, for example, the flexibility of the system to use spectrum, the terminal and The complexity of the base station, the ability to use channel information, the ability to form a network, the ability to communicate between networks, and the ability to support the mobile speed of the terminal. [0003] There are mainly three types of duplexing methods used in existing communication systems: pure Time Division Duplex (TDD for short) methods, such as TD-SCDMA systems; pure Frequency Division D...

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Problems solved by technology

However, it has the following disadvantages: when the coverage area is too large, the spectrum utilization efficiency is lower than that of the FDD method; and it is not as good as the FDD method in supporting high-speed mobile

However, it has the following disadvantages: it needs paired spectrum, which brings difficulties in spectrum planning; it is difficult to use the channel reciprocity feature, which makes the design of smart antennas more difficult; and the use of uplink and downlink spectrum is not enough to support asymmetric services flexible

[0015] The hybrid FDD of frequency band switching given by WINNER D2.5 v1.0 has the following disadvantages: Although the channel reciprocity characteristic of TDD is retained, it does not have the flexibility of spectrum use when TDD supports asymmetric services

In addition, this duplex method has the following disadvantages: like pure TDD, it will generate inter-band and intra-band interference when the system loses strict synchronization; and like pure FDD, it will require terminals and base stations to use complex Diplexer

However, its pure TDD duplex mode has the inherent disadvantage that the feedback delay is less than the wireless frame period; and its half-duplex mode does not have the flexibility of spectrum use when TDD supports asymmetric services

[0017] In short, the basic disadvantages of the existing hybrid duplex technology are: either the limitation of the TDD frame structure on the feedback delay still exists; or the limitation of FDD in the ability to support asymmetric services still exists

There is a lack of a duplex method that not only retains the channel reciprocity of TDD, the flexibility of uplink and downlink services, and the simplicity of duplexers, but also has the low feedback delay of FDD.

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