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Sending method and base station of downlink control information

A technology for controlling information and control channels, applied in wireless communication, space transmit diversity, electrical components, etc., can solve problems such as limited coverage performance of low-cost receiving antennas, high overhead, and lack of support for spatial multiplexing

Inactive Publication Date: 2013-07-24
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] Low-cost MTC UEs with limited receiving antennas will suffer from reduced coverage performance in the LTE system, and low-cost MTC UEs will not all use the above-mentioned numerous DCI formats and corresponding transmissions because they do not support spatial multiplexing, MIMO and other technologies. model
In addition, considering the enhancement of coverage performance, even if some of the existing DCI formats can be applied to low-cost MTC UEs, it will cause excessive overhead.
[0027] Aiming at the limited coverage performance of MTC UEs with low-cost receiving antennas in the LTE system, and then designing a suitable information transmission process for low-cost MTC UEs, no effective solution has been proposed so far

Method used

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  • Sending method and base station of downlink control information
  • Sending method and base station of downlink control information
  • Sending method and base station of downlink control information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0476] When the eNB sends system information to the UE, it only uses the PDSCH to carry the information and does not indicate it through the PDCCH.

[0477] The system information is carried in the PDSCH and sent in subframes 0 and 5. QPSK modulation is used. The TBS used is one of k types. It occupies 2 RBs of bandwidth in the full bandwidth, and the transmission mode of transmit diversity is adopted.

[0478] When receiving the public information, the UE performs blind detection in subframes 0 and 5. The UE detects whether the RNTI scrambled by the CRC attached to the message is the information sent to itself. In the search space within the entire bandwidth, the UE performs blind detection in units of 2 RB, and sequentially detects the number {1, 2} in the 6 RBs. , {3, 4}, {5, 6} RBs are detected in the third group, and then k TBSs are detected in RB numbers {5, 6}.

Embodiment 2

[0480]When the eNB sends public information to the UE, it only uses the PDSCH to carry the information and does not indicate it through the PDCCH.

[0481] The public information is carried in the PDSCH, sent in subframes 0 and 5, using QPSK modulation, using one of k types of TBS, occupying 2 RBs of the predefined bandwidth of 4 RBs, and adopting the transmission mode of transmit diversity .

[0482] When receiving the public information, the UE performs blind detection in subframes 0 and 5. The UE detects whether the RNTI scrambled by the CRC attached to the message is information sent to itself, and then performs blind detection in units of 2 RB in the search space within the predefined bandwidth.

[0483] For embodiment 1, the modulation method that can be adopted can also be other such as BPSK, 16QAM etc. besides QPSK; The occupied RB can be 1, 2, 3, 4, 5, 6 RB or more but less than 50RB; Blind detection RB There may be various combinations of time, and a combination of...

Embodiment 3

[0486] When the eNB sends public information to the UE, it uses the PDSCH to carry the information and indicates it through the DCI carried by the PDCCH.

[0487] The public information is carried in the PDSCH and sent in subframes 0 and 5, using QPSK modulation, using one of k types of TBS, occupying the bandwidth of 1 RB in the full bandwidth of 6RB, and adopting the transmission mode of transmit diversity.

[0488] When receiving the public information, the UE performs blind PDCCH detection in subframes 0 and 5. The UE detects whether the RNTI scrambled by the CRC attached to the message is the information sent to itself, and then performs blind detection and detection of DCI Format 1A according to the CCE aggregation level in the public search space within the full bandwidth, and then obtains the DCI in the PDSCH after obtaining the DCI public information.

[0489] At this time, the configuration of the transmission mode is:

[0490]

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Abstract

The invention provides a sending method of downlink control information. A base station transmits public information or user proprietary information to user equipment through a physical downlink shared channel (PDSCH), indication is conducted through the downlink control information (DCI) which is carried by a control channel, and the bandwidth which is occupied by the PDSCH is smaller than a system bandwidth. The invention further provides the base station.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a kind of downlink control applicable in LTE / LTE-A (Long Term Evolution / Long Term Evolution Advance, long term evolution / advanced long term evolution) system and its evolution system Information transmission method and base station. Background technique [0002] MTC (Machine Type Communication, MTC User Equipment, referred to as MTC UE), also known as M2M (Machine to Machine, machine to machine, referred to as M2M) user communication equipment, is the main application form of the Internet of Things at this stage . Low power consumption and low cost are important guarantees for its large-scale application. At present, M2M technology has been supported by internationally renowned manufacturers such as NEC, HP, CA, Intel, IBM, AT&T, and recognized by mobile operators in various countries. Currently, M2M devices deployed in the market are mainly based on the GSM (Glob...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W72/12H04B7/06
CPCH04W72/042H04W72/04H04W72/23
Inventor 石靖戴博夏树强方惠英李新彩
Owner ZTE CORP
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