Method and arrangement for communication using a dynamic transmission parameter

A technology of dynamic parameters and transmission schemes, applied in the direction of adjustment of transmission mode, transmission modification based on link quality, transmission system, etc., can solve problems such as performance degradation, and achieve the effect of increasing data rate, avoiding waste, and flexible complexity

Active Publication Date: 2015-12-23
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for many UEs not experiencing large delay spread, this long CP degrades performance

Method used

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  • Method and arrangement for communication using a dynamic transmission parameter
  • Method and arrangement for communication using a dynamic transmission parameter
  • Method and arrangement for communication using a dynamic transmission parameter

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[0032] Because there is an additional cost associated with using an extended CP, such a CP should only be used when it is suitable or required in terms of channel conditions. But even in cells where some UEs need extended CP, there are typically many UEs for which extended CP does not provide benefit. These UEs will actually achieve better performance if the carrier operates with a normal CP. But the use of normal CP will make the carrier useless for UEs with large time dispersion.

[0033] This document proposes a solution that is applicable eg in connection with a new carrier type NCT, eg when transmission is mandatory in such NCT only in subframes 0 and 5.

[0034]In the following, an example will be described where it is assumed that transmission is mandatory in certain LTE subframes. In order to link to the assumed properties of NCT, mandatory transmissions are taken in subframes 0 and 5 of an LTE frame in the example below. However, this should only be seen as an exam...

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Abstract

Base station and User Equipment (UE) and methods to be performed therein for communication using a dynamic transmission parameter. The method to be performed in a base station comprises scheduling of transmission resources to a UE in an OFDM symbol associated with a dynamic parameter value. The base station is assumed to be associated with a carrier where a radio frame comprises at least one OFDM symbol associated with a fixed parameter value and at least one OFDM symbol associated with a dynamic parameter value, where the parameter is a cyclic prefix, CP, or a subcarrier spacing, [delta]f. The method further comprises determining a value of the parameter based on a characteristic of a radio link associated with the UE, and applying the determined value of the parameter when communicating with the UE in the scheduled transmission resources.

Description

technical field [0001] The techniques suggested herein generally relate to communication between two nodes in a wireless communication system using dynamic transmission parameters. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a downlink modulation format used in the 3GPP Long Term Evolution (LTE) standard. with duration T u The OFDM symbol of consists of many subcarriers, each with Δf=1 / T u subcarrier spacing. Number of subcarriers N c and the subcarrier spacing determine the total transmission bandwidth of the OFDM signal, which can be approximated as BW≈Nc×Δf. In order to maintain subcarrier orthogonality in time dispersed channels, each OFDM symbol is used with duration T cp The cyclic expansion of to add prefixes. The total duration of the OFDM symbol then becomes T tot = T u +T cp . In principle, the cyclic prefix (CP) length should cover the maximum length of the expected time dispersion of the channel. However, CP repre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/26
CPCH04L1/0006H04L27/2666H04L27/2607H04W72/542
Inventor P.弗伦格E.埃里克森
Owner TELEFON AB LM ERICSSON (PUBL)
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