Control-less Response Message Segmentation for Coverage Enhancement
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving contention-based access response messages, particularly in coverage gaps where resource overhead is high due to repeated transmissions, leading to resource waste and reduced coverage for machine-type communication devices like smart meters.
Innovation Solution
The method involves selecting a group of radio resources for repeated transmission of control-less response message blocks, determining a starting point based on recent transmission parameters, and using repetition numbers and frequency locations to decode candidate response messages, allowing UEs to efficiently detect intended messages without control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated transmission is used to bridge coverage gaps, then coverage enhancement is achieved, but resource overhead increases significantly
Solution Approach 1:
The response message transmission is segmented into multiple repetition instances. Each repetition transmits the same response message content but can be received and decoded independently by UEs. This segmentation allows the network to achieve coverage enhancement through multiple transmissions while enabling UEs to stop decoding after successfully receiving one instance, thereby reducing overall resource overhead and energy consumption.
2Reliability
If response messages are transmitted with control information under repeated transmission, then message delivery reliability improves, but resource waste increases
Solution Approach 1:
The invention extracts and removes the control information from the repeated response message transmissions. Instead of including control information in each repetition, the response messages are transmitted as control-less blocks. UEs determine which response messages are intended for them based on pre-configured rules and their own identification, eliminating the need for redundant control information in each repetition and significantly reducing resource waste.
3Adaptability or versatility
If response messages are targeted for different types of UEs within a cell, then service diversity is supported, but transmission efficiency decreases due to repeated transmissions
Solution Approach 1:
The invention applies local quality by providing different response message formats and structures tailored to different UE types and service requirements within the same cell. Response messages can be customized with specific content and characteristics appropriate for each UE type (e.g., MTC, NB-IoT, normal LTE), while still using the same efficient control-less repeated transmission mechanism. This maintains service diversity without sacrificing transmission efficiency.
Data Source
AI summary
Methods and apparatus for obtaining a response message for CB access uplink transmission are disclosed. In one novel aspect, UE performs a CB access uplink transmission, selects a first group of radio resources for one or more candidate control-less response message blocks with corresponding transmission repetition number, retrieves and decodes one candidate response message block corresponds to one sub-group of resources in the first group of radio resources and determines if the candidate response message is intended for the UE. In one embodiment, the UE obtains the candidate response message by determining one or more repetition number and obtaining corresponding sub-group of resources from the starting point(s). In another embodiment, the UE determines one or more frequency locations to obtain the candidate response message. In yet another embodiment, the UE selects a second group of radio resources if no response message is detected within the first group of radio resources.