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Determining method and device for search space in narrowband system

A search space and determination method technology, applied in the field of communication, can solve the problem that the control channel search space structure is not suitable for NB-IoT narrowband system

Inactive Publication Date: 2017-06-30
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method and device for determining a search space in a narrowband system, to at least solve the problem that the control channel search space structure in the LTE system in the related art is not applicable to the NB-IoT narrowband system with only one PRB in the frequency domain bandwidth question of needs

Method used

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  • Determining method and device for search space in narrowband system
  • Determining method and device for search space in narrowband system
  • Determining method and device for search space in narrowband system

Examples

Experimental program
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Effect test

Embodiment 1

[0229] This optional embodiment is aimed at the manner in which the search space continuously occupies subframes or subframe sets.

[0230] At this time, candidate sets of different repetition times in the search space correspond to the same starting subframe in the time domain. At this time, the base station side configures the repeated set {R1, R2, R3, R4} or only configures R4, and the rest are multiplied by the factor k, such as k=1 / 2, 1 / 4, 1 / 8, etc. The aggregation level can be fixed, or different aggregation level sets can be determined according to different coverage types. For example, at this time, the base station configures the USS starting subframe of the terminal through RRC to be located in the first subframe of period C=640ms, and at the subframe position of 10*SFN+subframeindex mod 640=0. At this time, the coverage type is medium coverage type, and Rmax=R4=32 is configured. At this time, the remaining R3-R1 are determined to be 16, 8, and 4 by factors k=1 / 2, 1...

Embodiment 2

[0241] This optional embodiment is aimed at the manner in which the search space continuously occupies subframes or subframe sets.

[0242] At this time, the candidate sets with different repetition times in the search space are not all corresponding to the same start subframes in the time domain, and the candidate sets corresponding to the non-maximum number of repetitions have multiple start subframes in the search space. At this time, the base station side configures the repeated set {R1, R2, R3, R4} or only configures R4, and the rest are multiplied by the factor k, such as k=1 / 2, 1 / 4, 1 / 8, etc. The aggregation level can be fixed, or different aggregation level sets can be determined according to different coverage types. For example, at this time, the base station configures the USS starting subframe of the terminal through RRC to be located in the first subframe of period C=640ms, and at the subframe position of 10*SFN+subframe index mod 640=0. At this time, the coverag...

Embodiment 3

[0252] This optional embodiment is aimed at the manner in which the search space continuously occupies subframes or subframe sets. And the search space configured in different scenarios is different.

[0253] Among them, in the Inband scenario, there are many unavailable REs (Legacy PDCCH, CRS, etc.), which support a relatively large AL. In the standalone / guardband scenario, an aggregation level including AL=1 is supported. For example: Inband scenario supports AL=2, 4, 8, 16, and standalone / guardband scenario supports AL=1, 2, 4, 8.

[0254] The configuration method is the same as implementation 1 or 2.

[0255] Use different AL sets for different coverage levels, use different R sets determined by Rmax, the starting subframes of different Rs are the same, and the total number of candidate sets is not greater than the number of blind detection times for a single subframe in Legacy LTE.

[0256] Among them, when the search space is determined by continuously occupying subfra...

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Abstract

The invention provides a determining method and device for a search space in a narrowband system. The method comprises the steps that a terminal detects the search space in which a narrowband downlink control channel is located, wherein the search space takes R sub-frames or a sub-frame set as a unit in a time domain, the search space takes a whole narrowband or M subcarriers in the narrowband as the unit in a frequency domain, an R and M value set is a positive integer, the sub-frame set comprises X sub-frames, and an X value is a fixed value or is configured by a base station. Through application of the method and the device, the problem that in related technologies, the structures of the search spaces of the control channels in an LTE (Long Term Evolution) system are not applicable to demands of an NB-IoT (Narrowband Internet of Things) narrowband system of which frequency domain bandwidth has only one PRB (Physical Resource Block) is solved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for determining a search space in a narrowband system. Background technique [0002] Machine Type Communication (MTC for short) is also called Machine to Machine (M2M for short), and NarrowBand Internet of Things (NB-IoT for short) is currently the main application form of the Internet of Things. . This type of communication system is usually characterized by a narrower bandwidth, such as 1.4MHz, 200kHz, etc., compared with a Long Term Evolution (LTE) system; a large number of user terminals or equipment (User Equipment, UE for short), including Traditional handheld terminals, machines, sensor terminals, etc.; have coverage improvement requirements, including coverage improvement of 15dB or 20dB. [0003] At present, there are three working scenarios in the NB-IoT system: In-band located in the frequency band of the LTE system, guard-band located in the gua...

Claims

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Application Information

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IPC IPC(8): H04W4/00H04W48/12H04L5/00
CPCH04L5/0053H04W4/70H04W48/12
Inventor 石靖戴博夏树强袁弋非方惠英李书鹏陈宪明
Owner ZTE CORP
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