An essential architectural characteristic of XR clients is the reliance on a functional split between a set of composite pre-renderers that are implemented as parts of a presentation engine and a set of post-rendering operations implemented on an End Device prior to final output. Split rendering may be a necessity if the End Device is power constrained or limited in computational power. However, split rendering is not precluded from other End Devices that do not have such constraints. A discussion of relevant split rendering scenarios is provided in TR 26.865, together with general design guidelines for immersive audio split rendering systems and specific design constraints and performance requirements for split rendering solutions for the 3GPP IVAS codec [3]. The latter are the basis for defining the ISAR baseline solutions as specified in TS 26.249 and as realized in the split rendering feature of the IVAS codec [3], [10], [11].

This TR presents a characterization of the ISAR split rendering solutions specified in TS 26.249 in terms of audio quality performance and technical properties. The characterization is done for the ISAR baseline solution that is defined as a feature of the IVAS codec.

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