A performance improvement solution for edge users based on multi-point collaborative CoMP
1. Background of the program
Limited by many factors such as coverage distance/bandwidth/number of antennas/terminal capacity, the interference in the cellular edge area is prominent, and there are generally characteristics such as poor user perception and low spectrum efficiency, and the problem of uneven service quality between the center and the edge is naturally present, which brings many challenges to user experience and network operation and maintenance.
In the early stage, the basic CoMP multipoint collaboration technology has been deployed in some local areas to eliminate interference in the edge area and improve network performance, but there is room for further improvement in performance optimization. For example, FNR macro stations have high interference in multiple cells, and the asymmetric uplink and downlink coverage of macro and micro networks leads to weak coverage or many blind spots in the building, and the combined gain of downlink joint transmission is low due to phase differences.
The current solution is based on the CoMP collaboration technology implemented in the first phase, with the help of macro and micro synergy UL Only TRP (Transmit-Receive Point), uplink joint equalization JE (Joint Equalization), 1+N specifications CoMP JR (Joint Reception), and downlink CJT (Coherent Joint Transmission) and other technologies to evolve to a user-centric, non-inductive mobility network.
This solution is based on the following CoMP synergistic technologies implemented in Phase 1:
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2. Application scenarios and benefits
- Applicable scenarios:
overlapping coverage areas of multiple cells at the same frequency; The uplink PRB utilization rate is less than 30%, and the downlink PRB utilization rate is less than 10%. - Network gain:
Uplink gain: The uplink rate of macro and micro edge users is increased by 20%+, and in FNR mode, high NI interference scenarios suppress interference and improve uplink reception performance.
Downlink revenue: Improves the spectral efficiency and service experience of downlink users, and increases the downlink rate gain of edge users by 20%+ after the function is enabled.
3. Key technologies
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4. Deployment effect
- In the macro and micro scenarios, 3 groups were almost verified after the uplink UL only TRP function was enabled, and the uplink rate gain of the single UE level was 20%~50%.
- After the JE superposition 1+N specification JR function is enabled on the FNR macro station, the single-UE uplink rate gain is 40%+ in high-interference scenarios.
- After the TNR macro station is deployed with the downlink CJT function enabled, two groups of fixed-point verification are carried out, and the downlink rate gain is 20%~35%.
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The KPI benefits after large-scale deployment are as follows:
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5. Technological evolution
At this stage, CoMP collaboration needs to evolve from "cell-centric" to "user-centric" non-inductive mobile networks, and build a user-centric network (U-Net). Through multi-cell deep collaboration and the elimination of interference and handover caused by cell boundaries, the terminal can move freely without perception and ensure the steady-state experience of users. It is necessary to smoothly evolve to 6G, realize the coordination of time-frequency-space-energy domains, and establish a new form of networking.
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