Uplink Downlink Channel Synchronization Power Allocation
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Solution Overview
Problem
In conventional mobile communication systems, the transmission frame timing of the HS-SCCH and HS-PDSCH are not synchronized, leading to inefficient allocation of transmission power resources, and similarly, the lack of specified transmission frame timing for the E-AGCH in EUL further inhibits the effective use of transmission power resources.
Innovation Solution
Synchronizing the transmission frame timing of the uplink transmission rate allocation shared physical control channel (E-AGCH) with the downlink shared physical data channel (HS-PDSCH) to optimize power allocation and reduce scheduling complexity in the radio base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission frame timing of HS-SCCH and HS-PDSCH are shifted from each other, then mobile stations can avoid receiving HS-PDSCH assigned to other mobile stations, but the transmission power resource of the radio base station cannot be fully allocated to HS-PDSCH
Solution Approach 1:
The patent segments the frame structure by introducing a specific timing relationship where HS-SCCH is transmitted in even-numbered slots and HS-PDSCH is transmitted in odd-numbered slots within a 2ms frame. This segmentation allows mobile stations to correctly identify and receive their assigned HS-PDSCH while preventing them from erroneously receiving HS-PDSCH intended for other stations, thereby resolving the contradiction between reception accuracy and power allocation efficiency.
2Adaptability or versatility
If the transmission frame timing of E-AGCH is not specified, then scheduling flexibility is maintained, but transmission power resources cannot be effectively used
Solution Approach 1:
The patent applies preliminary action by specifying that E-AGCH must be transmitted at a timing synchronized with HS-PDSCH (specifically, in the same 2ms frame and preferably in odd-numbered slots). This predetermined timing arrangement allows the radio base station to efficiently allocate transmission power resources to E-AGCH while maintaining scheduling flexibility for uplink resources, thereby resolving the contradiction between adaptability and energy efficiency.
3Device complexity
If transmission frame timing is not synchronized between control channels and data channels, then channel independence is maintained, but power allocation efficiency is reduced
Solution Approach 1:
The patent introduces a dynamic yet structured timing relationship where control channels (HS-SCCH, E-AGCH) and data channels (HS-PDSCH) maintain specific slot-based synchronization within each 2ms frame. This dynamic timing arrangement preserves channel independence while enabling efficient power allocation, as the radio base station can coordinate power distribution across synchronized channels without requiring rigid structural coupling, thereby resolving the contradiction between device complexity and energy efficiency.
Data Source
AI summary
A mobile communication system is configured to control a transmission rate of user data to be transmitted from a mobile station to a radio base station via an uplink transmission rate allocation shared physical control channel, and to transmit user data from the radio base station to the mobile station via a downlink shared physical data channel. Transmission frame timing of the uplink transmission rate allocation shared physical control channel is synchronized with transmission frame timing of the downlink shared physical data channel.