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Downlink control channel sending method and receiving method and corresponding device

A technology of control channel and transmission method, which is applied in the field of communication, and can solve the problem that MTC is not applicable to the downlink control channel

Inactive Publication Date: 2014-02-12
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing downlink control channel design scheme is not suitable for MTC technology

Method used

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  • Downlink control channel sending method and receiving method and corresponding device
  • Downlink control channel sending method and receiving method and corresponding device
  • Downlink control channel sending method and receiving method and corresponding device

Examples

Experimental program
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Embodiment 1

[0025] The existing downlink control channels include: PDCCH, PHICH and PCFICH, among them, PCFICH is used to indicate the number of OFDM symbols occupied by PDCCH, and its existence is mainly to meet the dynamic and variable (generally millisecond level) system load requirements of the LTE system , however, for MTC, it is not necessary to use PCFICH to indicate the control resource size of each subframe for the following reasons:

[0026] First of all, MTC technology has very few downlink services. Existing MTC applications (such as meter reading, smart home, etc.) are basically uplink services, and the overhead of downlink control channels has little impact on services;

[0027] Secondly, the MTC business has a strong periodicity, and the change cycle is at least in seconds. Taking meter reading as an example, MTC devices such as water meters and electricity meters will report fixed-bit data at intervals of tens of seconds or longer. Therefore, it is not necessary to indicat...

Embodiment 2

[0049] In the prior art, the DCI formats supported by the PDCCH include: format 0, format 1 / 1A / 1B / 1C / 1D, format 2 / 2A, and format 3 / 3A. Among them, format 0 is used to transmit uplink resource indication information, format 1 / 1A / 1C is used for downlink single codeword resource indication, format 1B / 1D and format 2 / 2A are used for MIMO spatial multiplexing, and format 3 / 3A is used for uplink For power control, however, for MTC, the existing DCI design has the following problems:

[0050] First of all, for MTC, many DCI formats do not need to be supported. Some fields in the PDCCH corresponding to DCI are no longer needed, and the length of the fields needs to be cut. Among them, MTC will no longer use MIMO technology, so format 1B / 1D / 2 / 2A It will no longer be needed. The type of resource allocation method used by format 1 is type 1 or type 2, while the type of resource allocation method used by format 1A and format 1C is type 0. Since MTC uses a narrow bandwidth of 1.4MHz, three...

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Abstract

Disclosed are a method for sending and receiving downlink control channel, and corresponding device thereof. The method for sending downlink control channel includes the following steps: network side device sends the downlink control channel to Machine Type Communication (MTC) device, wherein, the downlink control channels sent to MTC device do not contain Physical Control Format Indicator Channel (PCFICH), said network side device predetermines Orthogonal Frequency Division Multiplexing (OFDM) symbol occupied by Physical Downlink Control Channel (PDCCH) with the MTC device, or said network side device notifies OFDM symbol occupied by PDCCH to the MTC device by broadcasting a system message to the MTC device. The solution in the present invention provides the design scheme of downlink control channel applied in MTC technology.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a method for sending and receiving a downlink control channel, and corresponding equipment. Background technique [0002] Machine-Type Communication (MTC, Machine-Type Communication) refers to a communication method between machines (device-to-device) without human participation. like figure 1 As shown, it is a schematic diagram of the MTC device communication scene in the prior art. Each MTC device communicates with the MTC server through the operator network, and each MTC device can send uplink data to the MTC server, and can also receive downlink data sent by the MTC server. Data is transmitted between the MTC device and the MTC server through the network side device. [0003] The main factor affecting the cost of MTC equipment is the cost of the radio frequency part and the baseband processing part, and the reduction of the bandwidth can greatly reduce the ...

Claims

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Application Information

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IPC IPC(8): H04W52/14H04W72/04H04L27/26
CPCH04W72/04H04W48/10H04W4/70H04W72/23
Inventor 江小威胡南崔春风吴伟民
Owner CHINA MOBILE COMM GRP CO LTD
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