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System and method of modulation and coding scheme adjustment for a LTE shared data channel

A technology for sharing data channels and coding schemes, which is applied in the field of modulation and coding scheme adjustments for long-term evolution shared data channels, and can solve problems such as reducing the reliability of control information and limiting scheduling flexibility

Inactive Publication Date: 2015-06-17
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology

The proposed TBS modification thus reduces control information reliability and limits scheduling flexibility for retransmissions
Furthermore, for allocations with a small number of radio blocks, the proposed modified algorithm is ineffective in rate-adjusting

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  • System and method of modulation and coding scheme adjustment for a LTE shared data channel
  • System and method of modulation and coding scheme adjustment for a LTE shared data channel
  • System and method of modulation and coding scheme adjustment for a LTE shared data channel

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Embodiment Construction

[0037] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

[0038] The present invention is a system and method for modulation and coding scheme adjustment of an LTE shared data channel. The present invention modifies the existing method of modulation order determination by index biasing. The offset is designed to be the actual number of OFDM symbols N OS When it is less than a predetermined threshold (for example, 11), increase the modulation order, and at N OS The modulation order is reduced above a predetermined threshold (eg, 11).

[0039] According to the LTE system specification 3GPP technical ...

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Abstract

A system, method and node for modulation and coding scheme adjustment for a Long Term Evolution (LTE) shared Data Channel. The method determines an actual number of orthogonal frequency division multiplexing (OFDM) symbols, NOS utilized for the shared Data Channel. A modulation order for transmission of data on the shared Data Channel is increased when the actual number of OFDM symbols NOS is less than 11 and decreased when NOS is more than 11. A modulation and coding scheme field (IMCS) of a downlink control information of the shared Data Channel may also be determined. If 0≰IMCS+11−NOS≰28, the modulation order is modified by utilizing a factor of (IMCS+11−NOS) in a standardized modulation scheme. If it is determined that IMCS+11−NOS<0, the modulation order is set to Quadrature Phase Shift Keying (QPSK). If it is determined that IMCS+11−NOS>28, the modulation order is set to 64 Quadrative Amplitude Modulation (64QAM).

Description

[0001] Related Application Cross Reference [0002] This application claims the benefit of US Provisional Application 61 / 088408, filed August 13, 2008, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to communication networks. More specifically but not limitedly, the present invention relates to systems and methods for modulation and coding scheme adjustment for Long Term Evolution (LTE) shared data channels. Background technique [0004] Fast link adaptation to fading channel conditions is employed in modern wireless communications (eg, Universal Mobile Telecommunications System (UMTS), LTE and future evolutions) to enhance system throughput capabilities as well as user experience and quality of service. Crucial to the work of fast link adaptation is the timely update of the channel conditions fed back from the receiver to the transmitter. Feedback can take the form of various correlations that can suppor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L1/00
CPCH04L1/0005H04L1/0003H04L1/0011H04L1/0026H04L5/0007H04L5/0044H04L5/0058
Inventor 郑荣富胡旸
Owner TELEFON AB LM ERICSSON (PUBL)
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