Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for mapping search space of downlink control channel

A technology for controlling channels and search spaces, applied in the field of search space mapping, can solve the problems of not being able to obtain frequency scheduling gains, and achieve the effect of improving performance

Active Publication Date: 2018-01-23
FUJITSU LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the existing search space function is reused, multiple candidate positions are mapped to adjacent subcarriers, for example, 4 candidate positions are mapped to the same resource block, which may limit the experience of all candidate positions for E-PDCCH same channel fading, therefore, frequency scheduling gain cannot be obtained

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for mapping search space of downlink control channel
  • Method and device for mapping search space of downlink control channel
  • Method and device for mapping search space of downlink control channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] An embodiment of the present invention provides a method for mapping a search space of a downlink control channel. figure 1 is the flowchart of the method, please refer to figure 1 , the method includes:

[0042] Step 101: Determine the search space allocated for the downlink control channel (PDCCH) according to the resource allocation method;

[0043] Step 102: Map each candidate position (candidate) of the PDCCH to the time-frequency resource corresponding to the search space at intervals of resource blocks (RB).

[0044]In this embodiment, the PDCCH is used to carry downlink control information (DCI, Downlink Control Information), and is constructed with a control channel element (CCE, Control Channel Element) as the smallest unit. As shown in Table 1, a PDCCH can be composed of L CCEs Composition, the value range of L is 1, 2, 4, 8, which represents the different aggregation levels of PDCCH (aggregation level), these L CCEs may be in M (L) sent at a location.

...

Embodiment 2

[0118] An embodiment of the present invention provides a base station, which is used for mapping a search space of a downlink control channel. Figure 7 For the composition diagram of the base station, please refer to Figure 7 , the base station includes:

[0119] A determining unit 701, which determines the search space allocated for the downlink control channel (PDCCH) according to the resource allocation mode;

[0120] The mapping unit 702 is configured to map each candidate position (candidate) of the PDCCH to the time-frequency resource corresponding to the search space at intervals of resource blocks RB.

[0121] In one embodiment,

[0122] The number M of RBs in the search space allocated by the mapping unit 702 for the PDCCH (RB) Not less than the number M of the candidate positions (L) When , each candidate position of the PDCCH is mapped to different RBs of the time-frequency resource corresponding to the search space.

[0123] In one embodiment,

[0124] The ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Embodiments of the present invention provide a method and device for mapping a search space of a downlink control channel (PDCCH). The method comprises: determining, according to a resource allocation manner, a search space allocated to a PDCCH; and spaced by a resource block (RB), mapping each candidate position (candidate) of the PDCCH to a time-frequency resource corresponding to the search space. According to the method and device in the embodiments of the present invention, different candidates of the PDCCH are mapped to different RBs, so as to obtain a frequency selectivity scheduling gain, thereby improving the performance of the PDCCH.

Description

technical field [0001] The present invention relates to wireless communication technologies, and more specifically, to a mapping method and device for a search space of a downlink control channel in an LTE (Long Term Evolution, long-term evolution) / LTE-A (LTE-Advanced, enhanced long-term evolution) system. Background technique [0002] With the evolution of the EUTRA (Evolved Universal Terrestrial Radio Access, Evolved Universal Terrestrial Radio Access) network, many new scenarios appear, such as heterogeneous networks with the same or different cell IDs. New characteristics of data channel and control channel shall be introduced. For the enhanced PDCCH (Physical Downlink ControlChannel, physical downlink control channel), the following needs to be considered: [0003] Ability to support increased control channel capacity; [0004] Can support frequency domain ICIC (Inter-Cell Interference Coordination, inter-cell interference cancellation technology); [0005] It can im...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04W88/08
CPCH04W72/1263
Inventor 王轶张元涛周华
Owner FUJITSU LTD