Methods and devices for uplink load estimation

A technology of upper limit and power, applied in the field of telecommunication network, it can solve the problems of difficult to estimate noise floor, difficult function of uplink channel, no improvement and enhancement, etc., to avoid the effect of calibration

Active Publication Date: 2008-01-09
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the noise floor is more difficult to estimate
Estimates of the noise floor according to the state of the art are usually associated with relatively large uncertainties, which may even be of the same order of magnitude as the entire usable capacity margin
It will therefore be very difficult indeed to achieve enhanced uplink channel functionality without improving the load estimation connected thereto

Method used

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  • Methods and devices for uplink load estimation
  • Methods and devices for uplink load estimation
  • Methods and devices for uplink load estimation

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Embodiment Construction

[0019] This detailed description is introduced with a somewhat in-depth discussion of how load estimation is performed and the problems encountered with prior art solutions in order to reveal their severity.

[0020] Figure 1 depicts a typical signal chain for an RBS. The received broadband signal from the antenna 1 first passes through an analog signal conditioning chain 2 consisting of cables, optical fibers, etc. Variations among the components, together with temperature drift, are such that when the signal enters the receiver 3 the scale factor for this part of the system will have an uncertainty of about 2-3 dB. In the receiver 3, many operations take place. For load estimation, the total received wideband power must be measured at some stage, denoted by 5 in Fig. 1. Furthermore, in this embodiment it is assumed that code power measurements are available at stage 6. The reference point for the estimator is called 4. Figure 1 schematically shows the points in the chain...

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Abstract

An inherent non-observability of the thermal noise power level is circumvented by estimating an upper limit of the thermal noise power level by time evaluations. An instantaneous total received wideband power is measured in a receiver. Preferably, also an instantaneous sum of powers of all links used in the same cell is provided. A quantity (P'), preferably the difference between the instantaneous total received wideband power and the instantaneous sum of powers of all links used in the same cell, is followed (110) during a time period (TLag). A minimum value (PMIN ) of that quantity is then used as an estimate of the thermal noise power level upper limit. Preferably, the time period is configured as a sliding window. An improved determination of noise rise can then be calculated and used for controlling traffic within the cell.

Description

technical field [0001] The present invention relates generally to telecommunication networks and in particular to the field of load estimation in cellular telecommunication networks. Background technique [0002] Wideband Code Division Multiple Access (WCDMA) telecommunication systems have many attractive properties for future development of telecommunication services. A particular technical problem eg in WCDMA and similar systems is the scheduling of the enhanced uplink channel for time intervals where interference conditions are suitable and where there is sufficient capacity in the uplink of the cell in question to support the enhanced uplink channel. It is well known that the existing users of a cell all contribute to the interference level in the uplink of a WCDMA system. This is because all user and common channels of a cell are transmitted in the same frequency band when using CDMA technology. The load of a cell is directly related to the interference level of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04Q7/34H04B1/707H04W24/00H04W52/14
CPCH04W52/146H04B1/707H04B17/0055H04W24/00H04B17/345
Inventor T·威格伦G·皮特斯T·奥斯特曼
Owner TELEFON AB LM ERICSSON (PUBL)
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