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.

CN101222730AActive Publication Date: 2008-07-16HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2008-07-16

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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.
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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 ...

Examples

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]...