Extended Synchronization Sequences for Random Access Coverage
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Solution Overview
Problem
The existing Extended Coverage GSM (EC-GSM) technology faces limitations in uplink coverage due to the 10 dB loss in mobile output power, which is not adequately addressed by current methods, resulting in sub-optimal performance on the random access channel.
Innovation Solution
The introduction of pre-defined synchronization sequences longer than 41 bits for access bursts, transmitted on the random access channel, allows for more accurate detection of initial access requests by network nodes, reducing the need for excessive repetitions and improving coverage without increasing latency or resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the synchronization sequence length is increased beyond 41 bits, then signal detection accuracy and phase estimation improve, but the time slot duration and resource usage increase
Solution Approach 1:
The patent changes the parameter of synchronization sequence length from the standard 41 bits to extended lengths (88 bits or 244 bits), thereby improving signal detection accuracy and phase estimation capability. This parameter change allows better coverage extension (4-6 dB) while managing the trade-off with time slot duration.
2Reliability
If access bursts are extended over two time slots, then coverage is improved, but latency and resource consumption increase
Solution Approach 1:
The patent introduces dynamic configuration of access burst structures, allowing the system to adaptively choose between 1-time-slot and 2-time-slot formats based on coverage requirements. The network can dynamically select appropriate synchronization sequence lengths (41, 88, or 244 bits) to balance coverage extension with latency constraints.
3Measurement precision
If more repetitions are used for signal transmission, then detection reliability improves, but resource usage and latency increase
Solution Approach 1:
The patent applies preliminary action by extending the synchronization sequence within each access burst to provide better initial signal detection capability. This reduces the number of repetitions needed compared to using short sequences with multiple repetitions, thereby conserving resources while maintaining detection reliability.
Data Source
AI summary
A method by a communication device for supporting a random access procedure in a wireless communication network. The communication device provides an indicator for indicating a presence of an initial access request by the communication device. The initial access request is part of the random access procedure. The indicator comprises a pre-defined synchronization sequence, wherein one of: the indicator comprises a first access burst extending over one time slot, wherein the first access burst comprises the pre-defined synchronization sequence, which is longer than 41 bits, and the indicator comprises a second access burst extending over two time slots, the second access burst comprising the pre-defined synchronization sequence, which is longer than 88 bits. The communication device transmits the indicator on a random access channel in uplink to a network node. The indicator indicates the presence to the network node of the initial access request.