Method and device for feeding downlink data

A technology of downlink data and feedback unit, which is applied in the direction of using the return channel for error prevention/detection, wireless communication, electrical components, etc., and can solve the problems of downlink data feedback and uplink subframes that cannot be fully and effectively utilized

Inactive Publication Date: 2013-03-27
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the downlink HARQ RTT delay of the UE is only limited by the TDD configuration of the PCell, that is, even if the TDD configuration of the SCell has more uplink subframes than the TDD configuration of the PCell, the downlink data cannot be transmitted through the uplink subframes of the SCell Feedback, therefore, in the existing multi-carrier system, the uplink subframes in the aggregated serving cells cannot be fully and effectively utilized

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  • Method and device for feeding downlink data
  • Method and device for feeding downlink data
  • Method and device for feeding downlink data

Examples

Experimental program
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Embodiment 1

[0046] This embodiment provides a downlink data feedback method. In this embodiment, according to the service requirements of the UE, the base station configures one PCell and at least one SCell for the UE. The operation flow of the downlink data feedback method described in this embodiment is as follows: figure 2 As shown, it mainly includes the following steps:

[0047] Step 201: the base station judges whether to configure uplink control channel resources for the SCell according to the TDD configuration of the UE's PCell and SCell, and configures the uplink control channel resources for the SCells that need to be configured with uplink control channel resources;

[0048] Specifically, in this step, the base station can complete the configuration of the SCell uplink control channel resources by generating radio resource control (RRC) signaling including the SCell uplink control channel resource configuration information and sending it to the UE. In this embodiment, the ab...

Embodiment 2

[0083] This embodiment provides another downlink data feedback method. In this embodiment, according to the service requirements of the UE, the base station configures one PCell and at least one SCell for the UE. The operation flow of the downlink data feedback method described in this embodiment is as follows: Figure 4 As shown, it mainly includes the following steps:

[0084] Step 401: the base station configures uplink control channel resources for the SCell;

[0085] In this step, the base station generates RRC signaling including the SCell uplink control channel resource configuration information, and sends it to the UE. In this embodiment, the above-mentioned uplink control channel resources refer to uplink subframes used for downlink data feedback, such as PUCCH. At this time, the base station can jointly complete the configuration of the PUCCH through the two messages of PhysicalConfigDedicated and RRCConnectionReconfiguration.

[0086] Step 402: When the UE perfo...

Embodiment 3

[0111] This embodiment also provides a downlink data feedback method. In this embodiment, according to the service requirements of the UE, the base station configures one PCell and at least one SCell for the UE. The operation flow of the downlink data feedback method described in this embodiment is as follows: Figure 6 As shown, it mainly includes the following steps:

[0112] Step 200: The base station judges whether uplink control channel resources have been configured for other serving cells (PCell or other SCells) having the same TDD configuration as the SCell, and if so, determines that it is not necessary to configure uplink control channel resources for the SCell; otherwise, Execute step 201;

[0113] Step 201: the base station judges whether to configure uplink control channel resources for the SCell according to the TDD configuration of the UE's PCell and SCell, and configures the uplink control channel resources for the SCells that need to be configured with uplin...

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Abstract

The invention provides a method for feeding downlink data. The method includes that a base station judges whether uplink control channel resources are required to be configured for secondary cells SCell or not according to a time division duplex (TDD) configuration of a primary cell PCell and the secondary cells SCell of user equipment (UE), and configures the uplink control channel resources for the secondary cells SCell required to be configured with the uplink control channel resources; the UE judges whether the base station configures the uplink control channel resources for the secondary cells SCell or not when the downlink data are fed, and the downlink data are fed via the uplink control channel resources if the base station configures the uplink control channel resources for the secondary cells SCell; and the downlink data are fed by uplink control channel resources which are configured for the primary cell PCell by the base station if the base station does not configure the uplink control channel resources for the secondary cells SCell. The invention further provides a device for implementing the method. The method and the device have the advantages that a round-trip time (RTT) delay of a downlink hybrid automatic retransmission request of a system can be greatly shortened, and the performance of the system and the user experience are improved.

Description

technical field [0001] The present invention relates to Time Division Duplex (TDD, Time Division Duplex) Carrier Aggregation (CA, Carrier Aggregation) technology, in particular to a downlink data feedback method and device in a multi-carrier system with different TDD configurations. Background technique [0002] In the Long Term Evolution (LTE) system and previous wireless communication systems, there is only one carrier under one base station, and the maximum bandwidth of one carrier in the LTE system is 20 megahertz (MHz). In the improved LTE (LTE-A, LTE Advanced) system, the peak rate of the system is greatly improved compared with LTE, and it is required to reach 1 gigabit / second (Gbps) in the downlink and 500 megabits / second (Mbps) in the uplink. However, if a base station only uses a carrier with a maximum bandwidth of 20MHz, it cannot meet the above peak rate requirement. Therefore, the LTE-A system needs to expand the bandwidth available to the terminal, thus introd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04L1/18
Inventor 陆扬刘柳李明菊陈岚
Owner NTT DOCOMO INC
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