CSIT collection method, cross-layer scheduling algorithm, and its system and equipment

A technology for user terminal equipment and base stations, which is applied in the communication between multiple stations, radio/induction link selection arrangement, selection device, etc., which can solve the requirement of delay in maintaining real-time services and guarantee QoS of different types of services at the same time. requirements and other issues, to achieve the effects of improving delay performance and delay jitter performance, improving spectrum utilization, and reducing signaling overhead.

Active Publication Date: 2008-07-16
HUAWEI TECH CO LTD
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problem to be solved by the present invention is to provide a CSIT collection method, a cross-layer scheduling algorithm based on the CSIT collection method and its system and equipment in the OFDM system, so as to solve the problem of how to effectively collect CSIT without processing in the prior art, and the inability to Guarantee the QoS requirements of different business types at the same time in the OFDM system, especially the lack of delay requirements that cannot maintain real-time services

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
  • CSIT collection method, cross-layer scheduling algorithm, and its system and equipment
  • CSIT collection method, cross-layer scheduling algorithm, and its system and equipment
  • CSIT collection method, cross-layer scheduling algorithm, and its system and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The implementation of the present invention will be further described in detail below in conjunction with the drawings and examples.

[0047] In the WRAN system, at the CPE side, 2048 subcarriers are divided into 32 subchannels. In order to collect channel state information of sub-channels, Embodiment 1 of the CSIT collection method of the present invention defines two kinds of channel state information exchange messages between BS and CPE: CSIT collection configuration message CSI-REQ-CFG and CSIT feedback message CSI- FED (CSIT Feedback Message, CSIT Feedback Message).

[0048] Table 1

[0049] Format

size

Remark

CSI_REQ_CFG_Message_Format(){

CSIT collects configuration messages

Management Message Type

8 bits

Manage message types

Nc

7 bits

Best subchannel to request feedback

quantity

Delta

X bits

Absolute maximum CSIT estimate

Difference

}

[0050]...

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

The invention discloses a CSIT acquisition method, a cross-layer scheduling algorithm and a system and a device thereof. The CSIT acquisition method of the invention comprises that: CPE utilizes a pilot signal sent by BS to make channel estimation to all sub-channels; when a specific event happens, the CPE sends CSIT feedback information to the BS according to CSIT estimation values. The CSIT acquisition method of the invention has the advantages of low signaling cost and high timeliness. The cross-layer scheduling algorithm of the invention utilizes the CSIT acquisition method of the invention to acquire CSIT information, takes scheduling modes such as DFS, power distribution and self-adapting of MCS, etc. into account entirely, can guarantee QoS demands of different service types simultaneously, in particular can improve time delay performance and time delay jitter performance of different service types at the same time, and improves the utilization rate of frequency spectrums. The system and the device of the invention can support blended data, voice and / video services.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a CSIT (Channel State Information at Transmitter, transmitter channel state information) collection method in an OFDM (Orthogonal Frequency Division Multiple, Orthogonal Frequency Division Multiplexing) system, and a cross-layer based on the CSIT collection method Scheduling algorithms and their systems and devices. Background technique [0002] In the functional requirements of the current IEEE 802.22 specification draft, it is stipulated that the WRAN system must be able to provide services supporting mixed data, voice and / or video through QoS (Quality of Service, Quality of Service). Considering this feature, in the current IEEE 802.22 standard draft, there are four types of services, namely UGS (Unsolicited Grant Service, unsolicited grant service), rtPS (Real-time Polling Service, real-time polling service), nrtPS (Non-real- time Polling Service, non-real-time ...

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 Applications(China)
IPC IPC(8): H04Q7/34H04B7/26
Inventor 许树荣刘坚能王锐吕林军
Owner HUAWEI TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap