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Downlink control information transmission method and apparatus

A technology of control information and transmission method, applied in the field of communication, can solve the problems of low capability, affecting DCI acquisition and downlink data reception, unable to obtain PCFICH channel information, etc.

Active Publication Date: 2014-05-07
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the UE obtains the PCFICH value by detecting the PCFICH channel mapped on the full frequency band; however, with the development of LTE technology, in the evolution version after Release 11, a low-capability UE may be supported. The UE only supports narrowband data processing capabilities, that is, it can only receive data in part of the frequency domain, which will cause the UE to be unable to obtain information about the PCFICH channel (for example, the frequency domain where the PCFICH channel resource is located is not within the capability of the UE), and then It is impossible to know the position of PDCCH or ePDCCH in the subframe, which further affects the acquisition of DCI and the reception of downlink data

Method used

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  • Downlink control information transmission method and apparatus
  • Downlink control information transmission method and apparatus

Examples

Experimental program
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Embodiment 1

[0074] figure 2 It is a schematic flowchart of an embodiment of a method for transmitting downlink control information in the present invention. The method in this embodiment is executed by a terminal, such as figure 2 As shown, the method may include:

[0075] 101. Receive downlink control information from a base station at a first predetermined time domain position in a predefined first subframe;

[0076] Wherein, the downlink control information is the PDCCH or ePDCCH carried in the first subframe. The PDCCH or ePDCCH occupies a predetermined time domain position of a subframe in the time domain, and occupies a certain frequency band in the frequency domain, and is used to transmit the downlink control information. The predetermined time domain position in a subframe indicates a preset time period in the subframe in this embodiment and subsequent embodiments, and it occupies a specific period of time in the subframe.

[0077]In an example, the first subframe is 1 ms, a...

Embodiment 2

[0087] image 3 It is a schematic flowchart of another embodiment of the method for transmitting downlink control information in the present invention. The method in this embodiment is executed by the base station, such as image 3 As shown, the method may include:

[0088] 201. Send downlink control information to the terminal at a first predetermined time domain position in a predefined first subframe, where the downlink control information is used to indicate to the terminal the communication resources used by the physical downlink shared channel;

[0089] Wherein, the predefined first subframe or the first predefined time domain position, for example, may be information specified in the standard and known to both the base station and the terminal, and at this time may be referred to as the predefined first physical location. The control format is determined, and the terminal will receive the downlink control information at the corresponding time domain position in the pre...

Embodiment 3

[0094] In the method for transmitting downlink control information provided in this embodiment, the predefined first subframe is a subframe located at a predetermined time domain position in a frame, or a subframe located at a predetermined time domain position in a frame within a set of multiple subframes.

[0095] For example, the predefined first subframe and the first predetermined time domain position may be determined according to a predefined first physical control format, and the predefined first physical control format means that the The method clearly stipulates in the standard that a certain subframe or a set of subframes is predefined in each frame, and any subframe in the certain subframe or set of subframes is sent to the low-capability For the UE, the above subframe is called the first subframe. And, the time domain position where the PDCCH or ePDCCH carrying the downlink control information is located is set based on the first predetermined time domain positio...

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Abstract

The invention provides a downlink control information transmission method and a downlink control information transmission apparatus. The method comprises the following steps that: downlink control information is received from a base station at a first predetermined time-domain position in a first predefined sub frame; and downlink data loaded on a physical downlink shared channel from the base station according to the indication of the downlink control information. With the downlink control information transmission method and apparatus of the invention adopted, user equipment (UE) can obtain the downlink control information without relying on PCFICH detection.

Description

technical field [0001] The present invention relates to communication technology, in particular to a method and device for transmitting downlink control information. Background technique [0002] In the Long Term Evolution (LTE for short) system, when the base station sends downlink data to the terminal, it will schedule time-frequency domain resources to carry the downlink data, such as transmitting the Physical Downlink Shared Channel (Physical Downlink Shared Channel) in a certain subframe. , referred to as: PDSCH), carry the downlink data on the PDSCH channel; at the same time, the base station will also transmit the Physical Downlink Control Channel (Physical Downlink Control Channel, referred to as: PDCCH) in this subframe, and the PDCCH is used to carry downlink control information (Downlink Control Information, DCI for short), the DCI includes, for example, the resource location of the downlink data on the PDSCH channel, the modulation and coding scheme used, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
CPCH04W72/23
Inventor 夏金环柯柏安吕永霞
Owner HUAWEI TECH CO LTD
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