Uplink BWP Switching Delay Compensation for Timing Advance
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Solution Overview
Problem
Current 3GPP New Radio (NR) specifications do not adequately address timing requirements for bandwidth part (BWP) switching in uplink (UL) communications, leading to confusion and potential inefficiencies due to the lack of separation between UL and downlink (DL) BWP switching delay requirements.
Innovation Solution
The proposed solution involves separating the BWP switching delay requirements for UL and DL communications, taking into account the timing advance (TA) for UL transmissions. This includes adjusting the BWP switching delay to compensate for the TA value and allowing for additional time slots based on the subcarrier spacing (SCS) and existing margins in the delay requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If BWP switching delay requirements are not separated for UL and DL communications, then the specifications are simpler, but the timing accuracy and communication efficiency deteriorate
Solution Approach 1:
The patent segments the BWP switching delay requirement into separate requirements for uplink and downlink communications. Specifically, it defines TBWPswitchDelayUL for uplink and TBWPswitchDelayDL for downlink, allowing each to be optimized independently according to their respective timing characteristics and requirements.
2Reliability
If BWP switching delay does not compensate for timing advance, then the calculation is simpler, but the switching accuracy and reliability worsen
Solution Approach 1:
The patent applies preliminary action by compensating for the timing advance value before determining the BWP switching delay. The formula TBWPswitchDelayUL = max(0, TBWPswitchDelay - TA) pre-adjusts the delay requirement by subtracting the timing advance compensation, ensuring that the UE has sufficient time to complete the switching while accounting for the uplink timing adjustment.
Data Source
AI summary
A device of a New Radio (NR) User Equipment (UE), a system, a method and a machine-readable medium. The device includes a radio frequency (RF) interface and processing circuitry coupled to the RF interface. The processing circuitry is to: cause communication with a NR evolved Node B (gNodeB) on a first bandwidth part (BWP); determine a BWP switching delay for an uplink (UL) communication from the UE to the gNodeB, the BWP switching delay based on a timing advance (TA) for the UL communication; encode the UL communication for transmission to the gNodeB; switch from the first BWP to a second BWP at an expiration of the BWP switching delay; and cause transmission of the UL communication on the second BWP.