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Method for scheduling user equipment in wireless communication network and a base station

A wireless communication network and user equipment technology, applied in the field of dispatching user equipment and base stations in the wireless communication network, can solve the problems of not providing the second type of interference protection, in-phase and quadrature imbalance, affecting signals, etc.

Active Publication Date: 2013-02-06
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first type of interference is usually caused by phase noise, frequency offset and channel time selectivity, which affects adjacent band signals
However, the power of the interference typically decays with frequency separation
The second type of interference is usually caused by in-phase and quadrature (IQ) imbalances, which affect the signal at the image band
However, the proposed arrangement does not provide protection against the second type of interference defined above in the context of OFDM subcarriers

Method used

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  • Method for scheduling user equipment in wireless communication network and a base station
  • Method for scheduling user equipment in wireless communication network and a base station
  • Method for scheduling user equipment in wireless communication network and a base station

Examples

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Embodiment Construction

[0022] image 3 A wireless communication network 8 (eg a WCDMA / LTE network) is shown comprising a network entity 10 (eg a base station 10 ) comprising one or more processing circuits 12 . The processing circuit 12 is configured to schedule a plurality of user equipments (UEs) 14 (shown as UE1...N) in a manner that mitigates intra-cell interference. More specifically, the processing circuit 12 schedules the UEs 14 based on their received signal power density, which can be expressed as:

[0023] D u = g u P max u W u Formula 1)

[0024] Among them, D u is the maximum achievable received signal power density of the uth UE14, g u is the (estimated) path gain of the uth UE14, P max u is the known or estimated maxi...

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Abstract

According to methods and apparatus taught herein, user equipments (UEs) in a wireless communication network are scheduled based on determining received signal power densities for a plurality of UEs to be scheduled, allocating UEs to scheduling intervals based on a sorting of their received signal power densities, and assigning UEs in the same scheduling interval to mirror frequency bands within an available frequency spectrum according to the sorting. For example, UEs to be scheduled are assigned to a given scheduling interval in rank order of their received signal power densities until the scheduling interval is fully allocated. Remaining UEs are assigned in rank order to one or more other scheduling intervals, and the process may be repeated or otherwise carried out on an ongoing basis. Such an allocation scheme tends to minimize both adjacent frequency and mirror frequency interferences between UEs scheduled in the same interval.

Description

technical field [0001] The present invention relates generally to serving multiple user equipment (UE), such as cellular radiotelephones, pagers, and other wireless communication devices, and in particular to Aspect manages UE. Background technique [0002] In the Long Term Evolution (LTE) process of the Universal Mobile Telecommunications System (UMTS), the transmission signals in the downlink and uplink are based on Orthogonal Frequency Division Multiplexing (OFDM) and Single Carrier Frequency Division Multiple Access (SC- FDMA). In an idealized situation, such uplink transmission signals from different UEs are orthogonal and do not interfere with each other at the network receiver(s), eg at multiple base station receivers. [0003] However, due to various flaws in transmitter and receiver implementations and time selectivity of fading channels, orthogonality cannot be maintained in practice, and signals from different UEs leak out of predetermined frequency bands and in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/36
CPCH04L5/023H04L27/2608H04W72/1231H04L5/006H04L5/0062H04L27/364H04W72/542
Inventor 郑荣富A·富鲁斯卡D·许M·卡兹米A·西蒙森P·斯基勒马克
Owner TELEFON AB LM ERICSSON (PUBL)