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Scheduling request transmission supporting high doppler

一种调度请求、多普勒效应的技术，应用在移动通信领域，达到高性能、大化复用容量的效果

Inactive Publication Date: 2010-09-08
NOKIA NETWORKS OY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means: It is difficult (or even impossible) to provide sufficient performance for the 360km / h case when using an on-off keying based SR mechanism

Method used

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  • Scheduling request transmission supporting high doppler
  • Scheduling request transmission supporting high doppler
  • Scheduling request transmission supporting high doppler

Examples

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Embodiment Construction

[0073] Following the teachings of its first embodiment, a method for limiting the actual SF in the block domain to an even number N (ie 6) even though there are N+1 (eg 7) symbols in the original spreading sequence is shown such that The way to arrange block-level spread spectrum method. In the scheme of the present invention, block spreading is performed using spreading sequences of length N.

[0074] Obtain a spreading sequence of length N+1 blocks by repeating a predefined block among N spreading blocks

[0075] • A consequence of this arrangement is that partial orthogonality, which is a property of spreading sequences of even length, can be provided for an odd number of blocks.

[0076] Note that orthogonal multiplexing over N+1 symbols has been achieved without reducing the amount of energy transmitted.

[0077] The above scheme will provide improved performance at high Doppler (reduced intersymbol interference between different block codes). The performance improveme...

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Abstract

Block spreading generating partial orthogality is applied for the uplink control channel for E-UTRA. For instance, a problem of maximizing the multiplexing capacity leads to numerology causing odd-length sequences which do not have the favorable property of even-length sequences (partial orthogonality). The consequence of this is poor performance in cases of high Doppler effects. Maximal multiplexing capacity is taught without loss of performance at high Doppler by modifying an earlier scheduling request (SR) scheme. The earlier SR multiplexing scheme has a number of parallel SR resources per slot equal to 12*7=84. In one example, the spreading factor of block spreading is changed to an even number, e.g., from 7 to 6. This enables usage of the partial orthogonality properties of CAZAC sequences and as a result inter-code interference in the case of high Doppler is reduced. Other ways to generate partial orthogonality are shown with similar results.

Description

technical field [0001] The present invention relates to mobile communications, and more particularly to better supporting communications with mobile devices in high speed motion. Background technique [0002] abbreviation [0003] 3GPP Third Generation Partnership Project [0004] CDM code division multiplexing [0005] CAZAC Constant Amplitude Zero Autocorrelation [0006] CP cyclic prefix [0007] E-UTRAN Enhanced UTRAN [0008] FDMA frequency division multiple access [0009] LTE Long Term Evolution [0010] OOK on-off keying [0011] Q quadrature [0012] RACH random access channel [0013] RR resource request [0014] SF spreading factor [0015] SNR signal to noise ratio [0016] SR Scheduling Request [0017] TTI transmission time interval [0018] UL uplink [0019] UTRAN Universal Terrestrial Radio Access Network [0020] UL SR Uplink Scheduling Request [0021] ZC Zadoff-Chu [0022] The present invention arose out of the background of research an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J13/02H04L5/02
CPCH04L5/023H04J13/00H04L1/1671H04B1/69H04L5/02H04L25/03006H04L27/2613H04L1/1893H04L5/0055H04W72/12
Inventor K·胡利K·帕朱科斯基E·蒂罗拉
Owner NOKIA NETWORKS OY
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