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Downlink control information transmission method and device

A technology for controlling information and sending methods, which is applied in the field of wireless communication, and can solve problems such as interference in public search spaces in heterogeneous networks, sending of public information in public search spaces, and inability to solve new carrier types, etc.

Active Publication Date: 2014-04-09
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The design of the public search space in the ePDCCH has not yet been researched. Although the existing technology can use the public search space in the PDCCH area to transmit public information, it still cannot solve the problem of independent operation of the new carrier type (NCT, New Carrier Type). The low cost terminal (Low Cost UE) accesses the large bandwidth system. In these two cases, it may not be possible to use the public search space in the PDCCH area to send public information, and the public search space interference problem in the heterogeneous network cannot be solved.

Method used

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  • Downlink control information transmission method and device

Examples

Experimental program
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Embodiment 1

[0337] In this embodiment, the time-frequency domain is fixed, the aggregation level is fixed, and the transmission mode is fixed. The method for sending downlink control information includes:

[0338]The predefined enhanced public search space is all subframes and all OFDM symbols immediately after the PDCCH in the time domain, and occupies 4 PRB pairs on the two sidebands of the 10MHz system bandwidth in the frequency domain; used when sending downlink control information There are two fixed aggregation levels, 8 and 16, respectively, and the corresponding candidate sets are 4 and 2; when sending downlink control information in the enhanced public search space, the format of ePDCCH carrying downlink control information is Format1C, using distributed mapping, and the distributed eREG alternately selects ports (ports) 107 and 109, and the ePDCCH schedules that the PDSCH carrying public information adopts a DMRS-based transmission mode and uses port7 for transmission.

Embodiment 2

[0340] In this embodiment, the time-frequency domain is fixed, the frequency domain offset is fixed, the aggregation level is fixed, and the transmission mode is fixed. The method for sending downlink control information includes:

[0341] The predefined enhanced public search space is all subframes and all OFDM symbols immediately after the PDCCH in the time domain, occupying 4 PRB pairs mapped at equal intervals in the 10MHz system bandwidth in the frequency domain, and performs frequency domain cyclic shift according to PCI bit; there are two fixed aggregation levels used when sending downlink control information, which are 8 and 16 respectively, and the corresponding candidate sets are 2 and 1; when sending downlink control information in the enhanced public search space, ePDCCH carries downlink control information The format is Format1A, using centralized mapping, and the centralized eREG alternately selects ports 107 and 108, and the used DMRS occupies 24 REs. The ePDCCH ...

Embodiment 3

[0343] In this embodiment, the time domain of the enhanced search space is notified through signaling, the frequency domain is fixed, the aggregation level is fixed, the transmission mode is fixed, and the port is instructed; the method for realizing the sending of downlink control information includes:

[0344] According to the time-frequency position indication signaling carried by PBCH, it is determined that the enhanced search space is part of subframes {1, 2, 3, 4, 6, 7, 8, 9} in the time domain, and the duration of the configuration is notified by carrying 2 bits on PBCH , the period is preferably one of the set {40ms, 80ms, 120ms, 160ms}, using all OFDM symbols immediately after the PDCCH, occupying 4 consecutive PRB pairs at the central frequency point of the 5MHz system bandwidth in the frequency domain; downlink When the aggregation level used for sending control information is N=4 and the cyclic prefix type is extended cyclic prefix, the aggregation level is 8, and t...

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Abstract

The invention discloses a downlink control information transmission method. A base station determines time-domain and frequency-domain positions of an enhanced search space carrying downlink control information and sends the downlink control information in the time-domain and frequency-domain positions. The invention further discloses a downlink control information transmission device. By the adoption of the scheme of the invention, the problem that a search space of a PDCCH region cannot be used for transmitting downlink control information is solved by using an enhanced search space to transmit downlink control information under the situation in which an NCT independently-operated and low-cost terminal is accessed into a large-bandwidth system.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a method and device for transmitting downlink control information. Background technique [0002] The radio frame in the Long Term Evolution (LTE, Long Term Evolution) system and the enhanced LTE (LTE-A, LTE-Advance) system includes Frequency Division Duplex (FDD, Frequency Division Duplex) mode and Time Division Duplex (TDD , Time Division Duplex) mode frame structure. The frame structure of FDD mode is as follows figure 1 As shown, a radio frame of 10 milliseconds (ms) consists of ten subframes (subframes) with a length of 1ms and numbered 0-9, and each subframe consists of two slots (slots) with a length of 0.5ms. The frame structure of TDD mode is as follows figure 2 As shown, a 10ms radio frame is composed of two half frames (half frame) with a length of 5ms, and a half frame includes five subframes with a length of 1ms. In the above two frame structures, for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/00
CPCH04L27/26H04L5/001H04L5/0053H04L27/2602H04W72/23H04W72/30H04W76/27H04L5/14H04L27/2607H04W72/0446
Inventor 石靖戴博苟伟鲁照华夏树强李新彩
Owner ZTE CORP
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