Scheduling Request Selection for Multi-Scheduler Wireless Uplink
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Solution Overview
Problem
In wireless communication systems with inter-base station carrier aggregation, the exchange of information among base stations is limited by backhaul delay and overhead, necessitating improved mechanisms for user equipment (UE) to efficiently communicate and manage multiple schedulers from different base stations for effective uplink scheduling.
Innovation Solution
The UE monitors SR triggering events, selects base stations based on predefined criteria and algorithms, performs logical channel prioritization, and manages SRs with bearer-binding configurations to ensure efficient communication with multiple schedulers, including sending SR failure indications and re-associating logical channels to different base stations as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE communicates with multiple schedulers from different base stations, then uplink scheduling flexibility and efficiency are improved, but device complexity increases due to additional coordination functions required
Solution Approach 1:
The patent segments the scheduling request mechanism by introducing separate SR triggering events for different base stations and implementing independent SR procedures for each scheduler. The UE maintains separate SR configurations and triggering conditions for each base station, allowing independent management of scheduling requests to different schedulers without requiring complex cross-coordination logic.
Solution Approach 2:
The patent applies preliminary action by pre-configuring SR associations with base stations before actual data transmission. The network configures SR triggering conditions and base station associations in advance, so when uplink data arrives, the UE can immediately determine which base station to contact based on pre-established rules, avoiding real-time decision complexity.
2Reliability
If base stations exchange information among themselves, then coordinated scheduling is improved, but backhaul delay and overhead increase
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine which base station should handle its scheduling requests based on pre-configured associations and local measurements. Instead of requiring base stations to exchange scheduling information through backhaul links, each base station independently manages its own SR reception and processing, eliminating the need for inter-base-station communication for SR coordination.
3Reliability
If the UE sends SR to multiple base stations, then scheduling reliability is improved, but message overhead increases
Solution Approach 1:
The patent introduces dynamic SR transmission behavior where the UE adaptively selects which base station to send SR to based on current buffer status, logical channel priorities, and pre-configured associations. The SR transmission target is not fixed but dynamically determined based on real-time conditions, allowing the system to send SR to multiple base stations when necessary while avoiding redundant transmissions when a single base station can handle the request.
Data Source
AI summary
Apparatus and method are provided to enhance scheduling request to multiple schedulers with inter base station carrier aggregation. In one novel aspect, the UE monitors and detects one or more SR triggering event. The UE selects one or more base stations based on predefined criteria and sends the SR to the selected one or more base stations. In one embodiment, at least one radio bearer of the UE is associated with multiple cell groups (CGs) in different base stations with association priorities. The association priorities may be configured by the network, derived based on predefined UE configurations, derived from load information received by the UE, or derived from radio measurements. In one novel aspect, the UE upon detecting SR failure triggered on a triggering radio bearer, sends SR failure indication to a RRC layer or associates the triggering radio bearer with a different base station.