Method for base station to transmit feedback signals to the terminal in time division duplex system

Abstract

A downlink signal transmission method used in a time division duplex system comprises the following processing: a transmitting device of the time division duplex system selects a downlink transmitting frequency spectrum used for downlink transmission; a base station selects part frequency spectrum from the downlink transmitting frequency spectrum to send a feedback signal used in the uplink in a two-way frequency spectrum to a terminal; moreover, the terminal acquires relevant information of the part frequency spectrum in the downlink transmitting frequency spectrum used to send the feedback signal to the terminal, and receives the feedback signal according to relevant information. The downlink signal transmission method can reduce the hardware complexity of the prior TDD system in supporting broadcast service and also provides a feedback path for the uplink of the TDD system at the same time, thereby improving the uplink throughput and the support capability on a high speed mobile terminal of the TDD system.

Description

technical field [0001] The present invention relates to the communication field, and more particularly, relates to a method for a base station to send a feedback signal to a terminal, which is especially suitable for a TDD (Time Division Duplex, Time Division Duplex) system using two frequency spectrums. Background technique [0002] In the technical report 25.913 given by the 3G technical specification organization 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP), "Requirements for Evolved Universal Telecommunication Radio Access (UTRA) and Evolved Universal Radio Access Network (Section 8.2 of "Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN)" determines the following principles for the flexibility of spectrum use: the system should support providing the same or different content transmission on a set of resource sets , this group of resource sets includes: Radio Band Resources (Radio Band Resources, RBR), power, adaptive sche...

AI Technical Summary

Problems solved by technology

[0008] However, there are still the following disadvantages in the related art: (1) The period T0 of the wireless frame limits the feedback frequency of the system closed-loop work. It not only limits the system throughput, but also limits the further improvement of the system's ability to support high-speed mobile terminals; (2) The baseband and channel resources of the existing TDD system support uplink and downlink at each frequency point Designed, however, most of the resources occupied by broadcast services are downlink resources. When the existing uplink and downlink resources designed in two-way communication are configured for broadcasting, it will result in the uplink baseband processing resources configured on the broadcast frequency point and the waste of uplink radio frequency channel resources; (3) the existing dual-mode mobile phone technology has only realized two independent standards (i.e. GSM and TD-SCDMA two standards), which can only coexist in the same terminal, but do not The in-depth coordination and integration of the two standards have not been realized

[0009] Although Ericsson (R1-062268) proposed "dedicated MBMS carrier using public transmission waveform" for the FDD system, if it is directly applied to the TDD system, it will cause the uplink interference of the downlink broadcast signal to the TDD system

[0010] At present, there is no technical solution that can take into account both the throughput of the TDD system and the ability of the TDD system to support mobile terminals.

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