R1-2508726
discussion
Evaluation assumption for 6GR air interface
From OPPO
Summary
This OPPO Tdoc for 3GPP RAN1#123 provides evaluation assumptions for 6G Radio, covering antenna modeling, system-level simulations, link budget, traffic models for legacy and AI/ML services, and energy efficiency power models. The document contains 17 proposals and 3 observations across these areas.
Position
OPPO proposes reusing NR evaluation assumptions from 38.802 and Rel-19 channel models for 7-24GHz as the baseline for 6G evaluation, while introducing specific antenna configurations (Tables 1-2) for 7GHz and 15GHz with different device types (IoT, handheld, CPE/FWA). OPPO supports Candidate 1 (MPL) link budget template from TR 38.830, arguing it is more realistic than the TR 38.913 template due to inclusion of antenna gain, cable/connector/body losses, and shadow fading margin. For traffic models, OPPO proposes extending FTP Model 1 with variable packet sizes based on probability distribution and FTP Model 3 with mixed packet sizes per cell (single size per UE) scaled across 3 data rate ranks from 15kbps to 3000kbps. OPPO proposes introducing token communication as a new AI/ML traffic type requiring token-level error identification, packet success rate defined by token error rate within a packet, differentiation of token importance, and performance metrics beyond BLER mapped to downstream service requirements. For NW energy efficiency, OPPO proposes using only BS category 1 from TR 38.864, allowing both static and dynamic power scaling, and defining OFDM-based WUS/WUR LP-TX/LP-RX power models with specific static-to-dynamic distribution ratios. For UE power, OPPO proposes a new 'Deep sleep 2' power state (relative power 0.1, transition energy 5000, transition time 100ms/150ms) and bandwidth adaptation power scaling extension down to 3MHz.
Key proposals
- Proposal 1 (Sec 2.1.1): The above Table 1 and Table 2 can be applied as antenna configurations for 7GHz and 15GHz.
- Proposal 4 (Sec 2.1.2): The evaluation assumptions/scenarios for NR (e.g., in 38.802) can be reused as much as possible.
- Proposal 6 (Sec 2.1.3): Support Candidate 1 (MPL) for the determination of link budget template for RAN1 study.
- Proposal 7 (Sec 2.1.4): For FTP model 1, consider variable packet size for arrived packets, with different probability for different packet sizes.
- Proposal 10 (Sec 2.1.5): A new traffic model for AI service (e.g., token communication) should be introduced in 6G, at least including following aspects: Introduce token communication as a new traffic type for RAN1 evaluation; Introduce token size, token packet size, token packet arrival, token packet success rate, assumptions on token importance.
- Proposal 13 (Sec 2.2.1): For 6GR BS main radio, take TR 38.864 model as baseline BS power model, but only considers BS category 1 for EE study.
- Proposal 16 (Sec 2.2.2): For 6GR eMBB UE, the TR 38.840/ TR 38.869 model is the starting point for UE power model with following: Introducing new power state between Deep-sleep and Ultra Deep-sleep, with power value of 0.1, transition energy as 5000 and the total transition time of 100ms/150ms; Extending power scaling for the bandwidth adaptation low to 3MHz and up to 200MHz, up to 7GHz frequency band; Reusing the scaling for number of PDCCH blind detection; The model further support for low/high capability mode (Mandatory Baseline/Full Functionality set); The power of low/high capability can be defined with scaling factor from high capability.
- Proposal 2 (Sec 2.1.1): For antenna modeling, consider different antenna configurations for different device types, and reuse the antenna modeling method in 38.901 (Rel-19).
- Proposal 3 (Sec 2.1.1): For antenna radiation power pattern, the pattern in 38.901(Rel-19) can be baseline, and further consider practically measured antenna radiation pattern if needed.
- Proposal 5 (Sec 2.1.2): The channel model output of 7-24GHz channel modeling in Rel-19 can be applied for 6G evaluation.
- Proposal 8 (Sec 2.1.4): For FTP model 3, consider mixed packet sizes per cell (single size per UE), with different UE distribution for different packet sizes.
- Proposal 9 (Sec 2.1.4): Consider the packet sizes with traffics scaled from 15kbps to 3000 kbps, with 3 different data rate ranks.
- Proposal 11 (Sec 2.1.5): Regarding the requirement for token communication, at least following aspects should be introduced: Assumptions on downstream service; Downstream service requirement; Transmission requirement to guarantee the service requirement; Requirements for token communication (e.g., for token error rate); Methodology for token error identification.
- Proposal 14 (Sec 2.2.1): For 6GR BS power model, both static and dynamic scaling can be considered, and the possible way to achieve this is given in Proposal 15.
- Proposal 15 (Sec 2.2.1): For OFDM-based WUS/WUR, the following model can be the starting point for BS LP-TX and LP-RX power model. Moreover, 6GR considers, for BS LP-TX, the static and dynamic part distribution ratio is 1:5 or 1:4 as a starting point and considers, for BS LP-RX, the static and dynamic part distribution ratio is 1:2 as the starting point.