Control information transmitting method and apparatus

A technology for controlling information and transmission methods, applied in the field of communication, can solve problems such as no effective solutions, and achieve the effect of rational use

Inactive Publication Date: 2015-07-29
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] For the above-mentioned problems existing in related technologies, there is no effective solution at present

Method used

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  • Control information transmitting method and apparatus
  • Control information transmitting method and apparatus
  • Control information transmitting method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0145] According to the downlink control channel type, aggregation level, and downlink control information type, the base station determines the search space in scenarios with coverage enhancement requirements, and its detection complexity is not greater than the maximum number of blind detection times (or blind detection complexity) in a single subframe.

[0146] When the downlink control channel is the PDCCH, the corresponding candidate set is extended by using the existing aggregation level and using only one simplified DCI format. When the downlink control channel is the EPDCCH, the existing aggregation level is used while only one simplified DCI format is used, and the corresponding candidate set is extended when the number of PRBs is extended. At the same time, the EPDCCH uses a set and the number of PRBs is configured as 6. It adopts a distributed transmission method, uses subframes 1, 2, 3, 4, 6, 7, 8, and 9 in the radio frame, and the OFDM start symbol is the same as t...

Embodiment 2

[0158] According to the downlink control channel type, aggregation level, and downlink control information type, the base station determines the search space in scenarios with coverage enhancement requirements, and the number of candidate sets is the same as the number of single subframe candidate sets.

[0159] When the downlink control channel is PDCCH, use the high aggregation level (including the expanded aggregation level) and the existing DCI format to extend the corresponding candidate set. The extension method is as follows:

[0160] Mode A: Remove candidate sets with low aggregation levels and expand candidate sets with high aggregation levels.

[0161] Way B: remove the candidate set with low aggregation level and at the same time expand the candidate set with high aggregation level and expand the new candidate set with higher aggregation level.

[0162] An example of one of the search spaces is given, as shown in Table 4 but not limited to Table 4.

[0163] Table 4...

Embodiment 3

[0167] According to the downlink control channel type, aggregation level, and downlink control information type, the base station determines the search space in scenarios with coverage enhancement requirements, and its detection complexity is the same as that of single subframe blind detection (or the maximum number of blind detection times).

[0168] When the downlink control channel is PDCCH, use a high aggregation level (including expanded aggregation level) and a simplified DCI format to extend the corresponding candidate set. The extension method is as follows:

[0169] Mode A: Remove candidate sets with low aggregation levels and expand candidate sets with high aggregation levels.

[0170] Way B: remove the candidate set with low aggregation level and at the same time expand the candidate set with high aggregation level and expand the new candidate set with higher aggregation level.

[0171] An example of one of the search spaces is given, as shown in Table 5 but not lim...

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Abstract

Provided are a method and device for transmitting control information. The method comprises: when control information is transmitted repeatedly, according to pre-set information, determining a search space, wherein the number y of candidate sets of a downlink control channel in the search space satisfies one of the following conditions: being not greater than the number of candidate sets of a single sub-frame, and being between the number of candidate sets of the single sub-frame and N times the number of candidate sets of the single sub-frame, where N represents the number of times of the control information being transmitted repeatedly; and transmitting the control information in a resource corresponding to the search space. By means of the technical solution provided in the present invention, the technical problems in the related art of unreasonable usage of an aggregation level and the like when a control channel transmits the control information repeatedly under the scenario of coverage enhancement are solved, thereby achieving the effects of reasonably using the search space during the repeat transmission of the control information and blind detection under the scenario of coverage enhancement.

Description

technical field [0001] The present invention relates to the communication field, in particular to a control information transmission method and device. Background technique [0002] Machine Type Communication (MTC for short) User Equipment (User Equipment or Terminal for short), also known as Machine to Machine (M2M for short) user communication equipment, is currently the main application of the Internet of Things form. In recent years, more and more mobile operators Suppliers choose LTE / LTE-A as the evolution direction of broadband wireless communication systems. MTC multi-type data services based on LTE / LTE-A will also be more attractive. [0003] The existing LTE / LTE-A system performs transmission based on dynamic scheduling of each subframe, that is, each subframe can transmit a different control channel. [0004] A physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) and an enhanced physical downlink control channel (Enhanced Physi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/18
CPCH04L5/0053
Inventor 石靖戴博夏树强李新彩刘锟方惠英
Owner ZTE CORP
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