Uplink Waveform Determination via Location Area Reporting
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Solution Overview
Problem
In wireless communication systems, determining the appropriate waveform for uplink transmissions is challenging, especially when the terminal device is not in RRC connected mode, leading to potential errors in scheduling due to the need for continuous transmission of uplink reference signals, which consumes power and may result in delayed signal tracking by the base station.
Innovation Solution
A communication method where the terminal device reports its location area to the network device, allowing the network device to determine a target waveform from multiple options based on the location, enabling efficient uplink transmission even when the terminal device is not in RRC connected mode, by transmitting first indication information and receiving second indication information to perform the uplink transmission using the determined waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device continuously transmits uplink reference signals to enable the base station to track changes, then the base station can accurately determine the waveform, but the terminal device consumes large amounts of power
Solution Approach 1:
The terminal device transmits location area information in advance during the random access request (before uplink scheduling), enabling the base station to pre-determine the appropriate waveform based on the reported location. This eliminates the need for continuous reference signal transmission, as the waveform can be determined from the initial location report alone.
Solution Approach 2:
The patent extracts the location area information from the terminal device and uses it as a standalone basis for waveform determination. Instead of relying on continuous reference signals, the base station determines the waveform solely based on the extracted location information, which is transmitted once during random access.
2Use of energy by moving object
If the terminal device does not transmit uplink reference signals to save power, then power consumption is reduced, but the base station cannot timely track changes in uplink reference signals, resulting in erroneous scheduling
Solution Approach 1:
The terminal device reports its location area information in advance during the random access request, before uplink scheduling occurs. This preliminary action provides the base station with sufficient information to determine the appropriate waveform without requiring subsequent reference signal transmissions, thereby maintaining scheduling accuracy while saving power.
Solution Approach 2:
The location area information acts as an intermediary that carries the necessary spatial context for waveform determination. Instead of using continuous reference signals as the mediator for tracking, the patent uses the location area report as a standalone intermediary that enables the base station to determine the waveform without further terminal transmissions.
3Device complexity
If the terminal device is not in RRC connected mode, then device complexity is reduced, but the network device cannot determine the waveform accurately leading to scheduling errors
Solution Approach 1:
The terminal device transmits location area information in the random access request message, which is sent before RRC connection establishment. This preliminary transmission of location information enables the base station to determine the waveform during the random access phase itself, without requiring the terminal to be in RRC connected mode, thus maintaining both low complexity and high accuracy.
4Use of energy by moving object
If the base station uses location area information to determine waveform, then power consumption is reduced and scheduling is improved, but the system requires additional indication information transmission
Solution Approach 1:
The patent merges the location area information transmission with the existing random access request message. Instead of creating a separate signaling channel or additional messages, the location information is combined into the random access request that the terminal device must send anyway for initial access, thereby avoiding additional signaling overhead.
Data Source
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AI summary
The application discloses a communication method, a terminal device and a network device, which are suitable for determining a waveform to be used in an uplink transmission of the terminal device in various scenarios. The method includes that: a terminal device transmits first indication information to a network device, where the first indication information is used to indicate a location area in which the terminal device is currently located; the terminal device receives second indication information transmitted by the network device, where the second indication information is used to indicate a first target waveform, the first target waveform being determined by the network device from at least two optional uplink waveforms according to the location area in which the terminal device is currently located; and the terminal device performs an uplink transmission using the first target waveform.