# 8.5.2 CDMA DL Power Control Methodology (VOICE ONLY)

Figure 193 presents the dependency between the condition of a user in the network (the so called geometry), mobile speed and soft handover state of the <span data-highlighted="true" data-vc="highlighted-text"><span class="_kqswh2mm"><span class="_5pioz8co _189e1dm9 _1il9buyh _19lc184f _d0altlke" data-testid="definition-highlighter">UE</span></span></span> that are needed to map a particular link quality to the channel power requirement.

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/jnFOKHkyatSTdyAf-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/jnFOKHkyatSTdyAf-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-nba9nh" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="241" data-vc="media-single" data-width="730" data-width-type="pixel" id="bkmrk-figure-193%3A-power-co"><div class="css-ej9os6"><div data-alt="" data-collection="contentId-493217" data-context-id="493217" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="235" data-id="21c3bbf6-e960-49d5-92b5-00ed31f6816f" data-node-type="media" data-renderer-start-pos="242" data-type="file" data-width="730"><div class="_2rko18qm _vchhusvi _kqswh2mm _ect4ttxp _p12f1osq _c71l1osq _1bsb1qmm _4t3ine4n _1hlmd0i9 _1rquusvi _eg541i5c _mts3kb7n _1ntskb7n _yfmhtlke _5sb1v00u new-file-experience-wrapper" data-media-vc-wrapper="true" data-testid="media-card-view" id="bkmrk-figure-193%3A-power-co-1"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="93.png" data-test-progress="1" data-test-source="remote" data-test-status="complete" data-testid="media-file-card-view"><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper">![](blob:https://ecowiki.atlassian.net/9edd11b7-8a7d-4cf2-88dd-47386888d284#media-blob-url=true&id=21c3bbf6-e960-49d5-92b5-00ed31f6816f&collection=contentId-493217&contextId=493217&width=730&height=235&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 193: Power Control Module (high level)**</div></div></div></div></div></div>All these factors determine the appropriate mapping of a particular link quality to the channel power requirement. For example, stationary users may require less power than moving users to attain the same link quality. Similarly, users connected to several <span data-highlighted="true" data-vc="highlighted-text"><span class="_kqswh2mm"><span class="_5pioz8co _189e1dm9 _1il9buyh _19lc184f _d0altlke" data-testid="definition-highlighter">BS</span></span></span>’s at the same time (soft handover) may require less power than users connected to a single <span data-highlighted="true" data-vc="highlighted-text">BS</span> to achieve the same link quality. Furthermore, users in favorable locations (high geometry) may again require less power than users that are in unfavorable locations (low geometry). Hence, link level data includes different mappings (look up tables) between link quality and required power for different mobile speeds, geometries and soft handover states. Furthermore, in order to remove the dependency on the total <span data-highlighted="true" data-vc="highlighted-text">BS</span> power (may vary from system to system), the power requirements are reported as normalized power fractions (fraction of the total <span data-highlighted="true" data-vc="highlighted-text">BS</span> power).

Consequently, the link level data is used in modelling power control in a variety of conditions such as different mobile speeds, geometrical user distributions, soft handover characteristics and amplifier output power ratings. In <span data-highlighted="true" data-vc="highlighted-text"><span class="_kqswh2mm"><span class="_5pioz8co _189e1dm9 _1il9buyh _19lc184f _d0altlke" data-testid="definition-highlighter">CDMA</span></span></span> Downlink, the link level is a function of Ec/Ior.