Control Message Validity Period for Wireless Coverage Extension
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless telecommunications systems face challenges in efficiently communicating with terminal devices in coverage-limited locations, particularly in terms of reducing the overall transmission resources needed for control messages, which can lead to increased interference and coordination issues.
Innovation Solution
The method involves a terminal device and base station communication scheme using a validity period for control messages to allocate transmission resources, allowing multiple data messages to be transmitted within that period, thereby reducing the need for repeated control messages and minimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station increases transmission power to improve coverage for terminal devices in coverage-limited locations, then coverage is extended, but interference in neighbouring communication cells increases
Solution Approach 1:
The patent segments the control message transmission by introducing a validity period that spans multiple subframes. Instead of transmitting control messages in every subframe, the system divides the transmission into segments where a single control message remains valid for multiple subframes, thereby reducing the frequency of transmissions and associated interference while maintaining coverage.
Solution Approach 2:
The patent implements periodic action by establishing a validity period for control messages that extends across multiple subframes. Control messages are transmitted periodically rather than continuously, with the validity period determining how long a control message remains effective. This periodic approach reduces transmission frequency and interference while ensuring coverage for terminal devices.
2Reliability
If the base station focuses transmission power into a subset of transmission resources allocated for coverage-limited terminal devices, then coverage is extended, but coordination among base stations becomes more complex
Solution Approach 1:
The patent applies universality by creating a multi-functional control message structure that serves multiple purposes: it allocates resources for current subframe transmissions and simultaneously provides validity information for future subframes. This universal control message reduces the need for separate coordination mechanisms between base stations while extending coverage.
3Reliability
If control messages are transmitted repeatedly to ensure reliable reception for coverage-limited terminal devices, then reliability is improved, but the amount of transmission resources required increases
Solution Approach 1:
The patent implements preliminary action by including a validity period indicator in the control message that pre-establishes how long the message remains effective. This preliminary information allows terminal devices to anticipate future transmissions and reduces the need for repeated control messages, thereby conserving transmission resources while maintaining reliable reception.
Solution Approach 2:
The patent ensures continuity of useful action by making control messages valid across multiple subframes through the validity period mechanism. Instead of requiring discrete repeated transmissions, a single control message continues to provide useful scheduling information across multiple subframes, reducing the total quantity of transmission resources needed while maintaining continuous reliable communication.
Data Source
AI summary
A wireless telecommunication system has a base station arranged to communicate messages to one or more terminal devices over a radio interface. The radio interface has a radio frame structure having a plurality of subframes, and a message may be transmitted in accordance with a first transmission scheme or transmitted in accordance with a second transmission scheme. The message may be transmitted in association with an identifier to indicate a terminal device to which the message is addressed. A characteristic for the identifier, for example a value or control region search space for the identifier, is dependent on whether the message is to be transmitted in accordance with the first transmission scheme or the second transmission scheme. A terminal device to which the message is addressed determines the transmission scheme from the characteristic of the identifier and receives the message accordingly.