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Control channel formulation in OFDM systems

A technology for control channel and data allocation, applied in the field of communication systems, can solve problems such as infeasible interference randomization, and achieve the effects of good interference randomization and good frequency diversity performance

Active Publication Date: 2010-12-08
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if these two fields are fixed, interference randomization is not feasible to make them prevent persistent interference

Method used

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  • Control channel formulation in OFDM systems
  • Control channel formulation in OFDM systems
  • Control channel formulation in OFDM systems

Examples

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Embodiment Construction

[0056] In short, existing schemes are deficient in that they fail to provide frequency diversity and interference randomization for each case of interest across multiple different cells of an OFDM system. An alternative is to interleave the mini-CCEs individually for each OFDM symbol. In such a case, if three OFDM symbols are used to transmit PHICH, PCFICH, and PDCCH, then three different symbol group permutations can be used to obtain measures of interference randomization and frequency diversity. Example interleaving and cyclic shifting patterns that result in relatively good frequency diversity and interference randomization when used on a per OFDM symbol basis are described herein below in particular with respect to the first and second embodiments.

[0057] The following example provides an explanation of why interleaving and cyclic shift patterns are chosen with a certain degree of care. This example relates to a control channel for an LTE system with four transmit ante...

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Abstract

Control channel information is formulated for transmission in orthogonal frequency division multiplexing (OFDM) systems. In an example embodiment, a method entails formulating control channel information for a transmitting device operating in an OFDM system in which a control channel spans n OFDM symbols, with n being an integer. The method includes acts of allocating, creating, and mapping. Control channel data is allocated to at least one set of resource element groups. At least one order for the set of resource element groups is created in accordance with one or more permutation mechanisms that involve at least one interleaving sequence having a low cross-correlation property. The set of resource element groups is mapped to resource elements of the n OFDM symbols of the control channel responsive to the order that is created using the permutation mechanism(s). The permutation mechanisms may include interleaving sequence(s) and / or cyclic shift(s).

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This US non-provisional patent application claims the benefit of preference from US provisional patent application 60 / 983372, filed October 29, 2007, entitled "Control Channel Symbol Permutation with Interference Randomization and OFDM Symbol Partitioning." US Provisional Patent Application 60 / 983372 is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to communication systems, and in particular, but by way of example only, to the formulation of control channel transmissions in Orthogonal Frequency Division Multiplexing (OFDM) systems. Background technique [0004] Many specialized terms and abbreviations are used in the field of communication technology. Reference is made to at least some of the following terms and abbreviations in the following text, such as in the background and / or description sections. Accordingly, the following terms and abbreviatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/0053
Inventor K·莫尔纳J-F·程S·帕克瓦尔
Owner TELEFON AB LM ERICSSON (PUBL)
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