MTC UE Network Selection and Random Access with Broadcast Indicators
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Solution Overview
Problem
MTC UE devices with low transmit power and low data rate require coverage expansion, necessitating eNBs that support supplementary transmission schemes, but existing methods fail to prioritize connection to suitable eNBs and identify MTC UE class promptly during network access.
Innovation Solution
MTC UE scans for eNBs supporting MTC UE by using broadcast messages with MTC supportability indicators and adjusts transmission schemes based on logical channel identifiers (LCIDs) to ensure proper network selection and access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If MTC UE uses low transmit power to operate at low data rate, then energy consumption is reduced and device simplicity is improved, but coverage area is insufficient and connection reliability deteriorates
Solution Approach 1:
The eNB broadcasts MTC supportability indicators before MTC UE attempts connection, allowing UEs to pre-select compatible eNBs. This preliminary action ensures that low-power MTC UEs connect to eNBs equipped with supplementary transmission schemes from the outset, maintaining connection reliability without requiring high transmit power.
Solution Approach 2:
The MTC supportability indicator acts as an intermediary signal between eNB and MTC UE. This indicator enables MTC UEs with low transmit power to identify and select eNBs that support supplementary transmission schemes, effectively bridging the gap between limited UE power capabilities and the need for reliable connection.
2Speed
If MTC UE connects to any eNB quickly, then access speed is improved, but connection stability deteriorates because the eNB may not support MTC supplementary transmission schemes
Solution Approach 1:
The eNB broadcasts MTC supportability indicators during initial cell search, allowing MTC UEs to identify compatible eNBs before attempting connection. This preliminary identification enables fast access to suitable eNBs while ensuring connection stability through pre-validated compatibility.
Solution Approach 2:
The MTC supportability indicator provides feedback information from eNB to MTC UE about capability compatibility. This feedback mechanism guides MTC UEs to select eNBs that support supplementary transmission schemes, ensuring both fast access and stable connection.
3Adaptability or versatility
If MTC UE notifies network of its class after connection, then protocol compatibility is maintained, but the delay in notification causes transmission scheme application delay reducing efficiency
Solution Approach 1:
The eNB broadcasts MTC supportability indicators before MTC UE connection attempts, enabling pre-identification of compatible eNBs. This allows the network to prepare appropriate transmission schemes in advance, eliminating post-connection notification delays while maintaining protocol compatibility through standardized indicator formats.
4Ease of operation
If MTC UE selects eNB based on signal strength only, then selection simplicity is improved, but coverage expansion capability deteriorates because low-power UEs cannot reach distant eNBs reliably
Solution Approach 1:
The eNB broadcasts MTC supportability indicators during initial cell search, allowing MTC UEs to identify compatible eNBs before connection attempts. This enables simple signal-strength-based selection among compatible eNBs while expanding effective coverage area by directing UEs to eNBs equipped with supplementary transmission schemes suitable for low-power operation.
Data Source
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AI summary
A method performed by a terminal in a wireless communication system is provided. The method comprises the following steps: transmitting a request message for requesting an establishment of radio resource control, RRC, connection on common control channel, CCCH, to a base station, in case that a random access response, RAR, message is received from the base station; and receiving a setup message for establishing the RRC connection as a response to the request message. Information indicating that the CCCH is for a terminal operating a machine type communication is transmitted with the request message to the base station. The information indicating that the CCCH is for the terminal operating the machine type communication includes a logical channel identifier, LCID, set to a determined value and the determined value is different from 0. The terminal operating the machine type communication is characterized as having a maximum data rate of predetermined bits within a time interval for a transmission.