IAB-MT Frequency Error Requirement Discussion

Background information and discussions on defining absolute or relative frequency error requirements for IAB-MT in relation to parent throughput, implementation impact, and test configurations. Various viewpoints and concerns were raised regarding the impact on parent IAB node throughput, synchronization sources, and frequency accuracy performance. Papers analyzing the system impact of frequency errors were referenced, highlighting potential constraints and considerations for network performance when using IAB-MT as a synchronization source. The problem definition and proposed way forward for IAB-MT frequency error requirements were also outlined.

• IAB-MT
• Frequency Error
• Requirement
• Synchronization Source
• Network Impact

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Presentation Transcript

1. 3GPP TSG-RAN WG4 Meeting # 94-e-Bis Draft R4-2005489 Electronic Meeting, 20 30 Apr., 2020 WF for IAB WF for IAB- -MT frequency error MT frequency error requirement requirement CATT

2. Background (1/2) IAB-MT frequency error requirement was discussed for several meetings. There were different views if absolute or relative frequency error requirement should be defined for IAB-MT. The followings were considered in order to make the decision. Synchronization source Impact to parent throughput Implementation impact Test configuration

3. Background (2/2) There were some discussions related to IAB parent throughput and the synchronization source for IAB-DU (parent node or IAB- MT). Some company showed concerns on the following issues. With setting relative frequecy error of 0.1ppm on IAB-MT, companies does not see the parent IAB node throughput impact anymore. When IAB-MT is used as sychronization source in a child IAB, the child IAB absolute frequency accuracy performance (0.05ppm for WA IAB-MT and 0.1ppm for MR/LA IAB-MT) need to be investigated considering the below conditions: IAB-MT relative frequency error is 0.1ppm Parent IAB absolute frequency error is 0.05ppm or 0.1ppm

4. Background- system impact Several papers [1]-[4] identify the impact of the parent IAB node thoughput impact when IAB-MT relative freqeuncy error exceeding 0.1ppm. Paper [4] further analysis that the absolute frequency error of child IAB-MT will contrain to 0.0075ppm when considering the parent IAB absolute frequency error s worst case and subject to no-impact on parent IAB node throughput. Paper [3] further analysis that when IAB-MT is used as synchornization source, the IAB-MT frequeqncy error will be bounded with IAB-DU absolute frequency error and thus the contrains in [4] still exist but not as tight as 0.0075ppm if the parent IAB can notify the child IAB in advance when its own frequency error plus IAB-MT tracking errro approach/exceed the child IAB-DU absolute frequency error.

5. Background Problem definition: With setting relative frequecy error of 0.1ppm on IAB-MT, companies does not see the parent IAB node throughput impact anymore. when IAB-MT is used as sychronization source in a child IAB, the child IAB absolute frequency accuracy performance (0.05ppm for WA IAB-MT and 0.1ppm for MR/LA IAB-MT) need to be investigated considering the below conditions: IAB-MT relative frequency error is 0.1ppm Parent IAB absolute frequency error is 0.05ppm or 0.1ppm

6. Way Forward IAB-MT frequency error requirement is defined as relative requirement as +/-0.1 PPM relative to received signal from parent. Test case configuration should be implementation agnostic and further discussion on test aspect can happen during conforming testing phase. Companies are encouraged to provide opinions on potential network impact when IAB-MT is used as synchronization source according to problem definition in previous slide.

7. Reference [1] R4-2003311, Discussion of IAB-MT frequency error requirement , CATT [2] R4-2004151, frequency error requirement for IAB , ZTE [3] R4-2004167, IAB-MT Frequency error , Ericsson [4] R4-2001431, TP to TR 38.xxx IAB-Node Frequency error requirements in FR2 , Nokia, Nokia Shanghai Bell [5] R4-2000278 OTA transmit signal quality for IAB-MT , Samsung [6] R4-1912288, [IAB] Discuss IAB frequency error , Huawei