Allocating method and device for control channel data in OFDM systems

A control channel and control channel information technology, which is applied in the field of control channel transmission formulation, can solve the problem of unfeasible interference randomization, and achieve the effect of good interference randomization and good frequency diversity performance

Inactive Publication Date: 2014-09-17
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Allocating method and device for control channel data in OFDM systems
  • Allocating method and device for control channel data in OFDM systems
  • Allocating method and device for control channel data in OFDM systems

Examples

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Embodiment Construction

[0056] In short, existing schemes are deficient since they fail to provide frequency diversity and interference randomization for each scenario of interest across multiple different cells of an OFDM system. An alternative is to interleave mini-CCEs individually for each OFDM symbol. In such cases, if three OFDM symbols are used to transmit PHICH, PCFICH and PDCCH, three different symbol group permutations can be used to obtain interference randomization and measurements of 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, particularly with respect to the first and second embodiments.

[0057] The following example provides an explanation as to why the interleaving and cyclic shifting types should be chosen with some degree of care. This example concerns a control channel for an LTE system with four transmit ant...

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Abstract

Control channel information is formulated for transmission in an Orthogonal Frequency Division Multiplexing (OFDM) system. In an example embodiment, a method entails formulating control channel information for a transmitting device operating in an OFDM system, wherein the control channel spans n OFDM symbols, n being an integer. This method includes the acts of assigning, creating and mapping. Control channel data is allocated to at least one set of resource element groups. At least one order for said set of resource element groups is created according to one or more permutation mechanisms involving at least one interleaved sequence having low cross-correlation properties. Said set of resource element groups is mapped to resource elements of n OFDM symbols of the control channel in response to the order created using the permutation mechanism. Permutation schemes may include interleaved sequences and / or cyclic shifts.

Description

[0001] Cross References to Related Applications [0002] This US nonprovisional patent application claims preferred benefit 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 only by way of example, 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 communications technology field. Reference is made to at least some of the following terms and abbreviations in the text that follows, such as in the Background and / or Description sections. Accordingly, the following terms and abbreviations are d...

Claims

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Application Information

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Patent Type & Authority Patents(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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