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
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  • 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 oth

Method used

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  • 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...

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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

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Application Information

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IPC IPC(8): H04L27/26H04J11/00
Inventor 夏树强杨扬
Owner ZTE CORP
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