Variable power control step sizes for high speed uplink packet access (HSUPA)

A technology of power control and step size, applied in transmission control/equalization, power management, network traffic/resource management, etc., and can solve problems such as slow link adaptation

Active Publication Date: 2008-06-04
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of whether the Node B or the RNC initially determines the desired power for UE transmission, th

Method used

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  • Variable power control step sizes for high speed uplink packet access (HSUPA)
  • Variable power control step sizes for high speed uplink packet access (HSUPA)
  • Variable power control step sizes for high speed uplink packet access (HSUPA)

Examples

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Embodiment Construction

[0019] As mentioned above, embodiments of the present invention relate to power control in wireless communications. In the above context, where Node B is allowed to use relative grants, some link adaptation speed is definitely lost when the step size is only 1 dB, as is the case in the prior art. For example, if the Node B wants the UE to increase the power by multiple dB, multiple control messages to the UE are required, each commanding it to increase by one step size. The signaling overhead associated with multiple messages compared to one message is an obvious waste of radio resources, so the time delay in the above architecture prevents radio resources from being allocated most efficiently and leads to potentially larger ineffective.

[0020] With reference to Fig. 1, the radio network controller RNC10 is connected on the node B30 (optionally, referred to as base transceiver station BTS here), and the node B is connected on the user equipment UE40 successively through the...

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Abstract

A set of power control step size increments are determined such that at least two step size increments differ from one another. The set is sent to a Mobile Station MS. A first power command to the MS informs of a first power for a uplink data transmission on a radio resource (E-DPDCH). To change power on the same radio resource, an offset is computed, the set of step size increments is accessed to determine which one, or combination of them, yield the offset, and the MS is informed of the second power by a second message that identifies those elements of the set that alone or in combination yield the offset. The MS determines the second power as a function of the first power and the step size increment(s) from the second message.

Description

technical field [0001] The teachings of the present invention relate generally to wireless communication systems, and more particularly to digital wireless communication systems in which wireless transmissions from user equipment (UE) to network nodes are power controlled. Background technique [0002] Generally, three kinds of nodes of a communication system are relevant: the radio network controller RNC, the Node B and the user equipment UE. A Node B is interchangeably called a Base Transceiver Station BTS and a UE is interchangeably called a Mobile Station MS. The RNC and Node B are network elements, but the communication between the UE and the network is not considered as part of it. Typically multiple Node Bs are under the control of one RNC, and typically multiple UEs are under the control of one Node B. Power control is an important feature in any packet-switched wireless system, allowing multiple users to access the system simultaneously. [0003] Included in HSUP...

Claims

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Application Information

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IPC IPC(8): H04B7/005H04L12/56H04W28/18H04W52/14H04W52/16H04W52/22H04W52/36H04W52/54
CPCH04W52/16H04W52/54H04W52/362H04W52/367H04W52/146H04W28/18H04W52/386H04W52/241H04W52/228H04W52/286H04W52/26
Inventor J·威加德K·朗塔-阿奥B·塞比尔
Owner NOKIA TECHNOLOGLES OY
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