Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multicast Single frequency network subframe structure in mobile broadband system and transmitting method thereof

A multicast single-frequency, mobile broadband technology, applied in multi-frequency code systems, orthogonal multiplexing systems, multiplexing communications, etc., can solve problems such as waste of resources, improve reception performance, and enhance anti-interference. effect of ability

Inactive Publication Date: 2008-05-21
ZTE CORP
View PDF0 Cites 45 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause a blank time of 720 samples in length between the OFDM symbols of the first two unicast short CPs and the subsequent OFDM symbols of other multicast long CPs in the multicast SFN subframe, resulting in resource waste of
The same problem exists for other bandwidths or sampling frequencies

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
  • Multicast Single frequency network subframe structure in mobile broadband system and transmitting method thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0057] Frame structure 1 (as shown in Figure 2): the length of the subframe is 1 ms, including 12 OFDM symbols, wherein the first two symbols (#0, #1) are unicast symbols, and the first two symbols of the existing unicast subframe The CP length configurations of the two symbols are consistent. The following 10 symbols (#2-#11) are multicast multicast symbols, and the CP of these 10 symbols can have 1 or 2 lengths.

[0058] Several specific parameter configurations of frame structure 1:

[0059] Using a sampling frequency of 30.72MHz, the idle time length is 512*2-160-144=720 samples, and the following typical time slot configurations can be had:

[0060] Configuration A1: The 720 free sample points are evenly distributed to the long CP of the following 10 unicast multicast symbols (#2-#11), so that the CP length of each unicast multicast symbol is 512+72= 588 samples, specifically:

[0061] Symbol #0: the symbol length is 2048 samples, and the CP length is 160 samples;

[...

no. 2 example

[0086] Frame structure 2 (as shown in Figure 3): the length of the subframe is 1 ms, including 12 OFDM symbols, wherein the first two symbols (#0, #1) are unicast symbols, and the first two symbols of the existing unicast subframe The CP length configurations of the two symbols are consistent. The first unicast symbol (#0) and / or the second unicast symbol (#1) also contains a cyclic suffix. The following 10 multicast multicast symbols (#2-#11) have the same CP length or may have one or two lengths as in the first embodiment.

[0087] Several specific parameter configurations of frame structure 2:

[0088] Configuration B1: Assign the free 720 samples to the second unicast symbol (#1) as its cyclic suffix, specifically:

[0089] Symbol #0: the symbol length is 2048 samples, and the CP length is 160 samples;

[0090] Symbol #1: the symbol length is 2048 samples, the CP length is 144 samples, and the cyclic suffix length is 720 samples;

[0091] Symbols #2-#11: the symbol lengt...

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 sub-frame structure of a Multicast Single Frequency Network as well as a sending method in a mobile broadband system. The invention can avoid waste of resources caused by blank sampling points in the sub-frame of the Multicast Single Frequency Network. Every single sub-frame of the Multicast Single Frequency Network comprises a plurality of OFDM symbols. The method comprises that the following steps: increasing the length of the OFDM symbols circulation and / or adding the suffix of the OFDM symbols circulation while node B structures downstream MBSFN sub-frame, so as to ensure data exist in all samples of the MBSFN sub-frames; the node B sends the well-structured sub-frames of MBSFN to each terminal.

Description

technical field [0001] The invention relates to a mobile broadband system, in particular to a multicast single frequency network subframe structure in a 3GPP LTE system and a sending method thereof. Background technique [0002] With the development of mobile communication systems, the data transmission rate is required to be higher and higher, so the application of parallel multi-carrier multiple access technology in mobile communication systems is imperative. Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) is a common multi-carrier modulation technology, which is suitable for high-speed data transmission on broadband channels with severe frequency selective fading caused by multipath transmission. , and can use Fast Fourier Transform (FFT: Fast FourierTransform) to realize the modulation and demodulation of the baseband signal, thus having the advantages of low cost of the transceiver. In the future broadband wireless communic...

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
IPC IPC(8): H04L27/26H04J11/00
Inventor 夏树强杨扬
Owner ZTE CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com