Paging Carrier Allocation in Multi-Carrier Systems
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Solution Overview
Problem
Existing radio access systems face inefficiencies in allocating paging carriers, particularly in multi-carrier environments, where efficiently informing mobile stations of paging carriers and managing paging loads across multiple carriers is challenging.
Innovation Solution
A method is introduced to allocate paging channels to specific carriers, using messages like Broadcast Channel (BCH) or additional broadcast information to indicate allocation, and employing modulo operations based on MAC addresses to determine paging carriers, allowing mobile stations to implicitly recognize and manage paging carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If paging channels are allocated to all carriers, then mobile stations can receive paging messages on any carrier, but system complexity and resource overhead increase
Solution Approach 1:
The patent divides the set of carriers into different groups, with specific carriers designated for paging channel allocation. Instead of allocating paging channels to all carriers uniformly, the system segments carriers and assigns paging functionality to selected ones, reducing overall system complexity while maintaining paging capability across the network
Solution Approach 2:
The patent applies different qualities to different carriers by allocating paging channels selectively to specific carriers based on local conditions such as traffic load, channel quality, and mobility patterns. This allows the system to optimize paging performance on a per-carrier basis rather than applying a uniform approach across all carriers
2Reliability
If mobile stations monitor all carriers for paging messages, then paging delivery reliability improves, but power consumption increases
Solution Approach 1:
The patent segments the monitoring task by directing mobile stations to monitor only specific carriers that are designated for paging channel allocation. Instead of requiring mobile stations to continuously monitor all carriers, the system divides the monitoring burden by assigning specific paging carriers to specific mobile stations or paging groups, thereby reducing power consumption while maintaining reliable paging delivery
Solution Approach 2:
The patent implements periodic paging opportunities on designated carriers, allowing mobile stations to enter sleep modes between paging occasions. Mobile stations wake up at predetermined intervals to check for paging messages on their assigned carriers, rather than continuously monitoring all carriers, thus reducing power consumption while ensuring timely page reception
3Measurement precision
If paging channels are allocated explicitly through broadcast messages, then allocation accuracy improves, but message overhead increases
Solution Approach 1:
The patent enables mobile stations to self-determine their paging carriers using predetermined rules such as hashing functions based on mobile station identities or cell identities. Instead of requiring the network to explicitly broadcast allocation information to each mobile station, the system allows mobile stations to autonomously calculate their assigned paging carriers, thereby reducing message overhead while maintaining precise and consistent allocation
Solution Approach 2:
The patent changes the allocation approach from explicit parameter broadcasting to implicit parameter derivation. By using functions that map mobile station identities to carrier indices, the system transforms the allocation information from explicit broadcast parameters to implicitly derived parameters, reducing the quantity of broadcast messages while maintaining allocation accuracy
4Device complexity
If paging loads are concentrated on fewer carriers, then system complexity reduces, but paging capacity and reliability decrease
Solution Approach 1:
The patent segments the paging load across multiple carriers by distributing different paging groups or different mobile stations to different carriers. This segmentation prevents load concentration on a single carrier while avoiding the need for mobile stations to monitor all carriers, thus maintaining paging capacity and reliability without significantly increasing system complexity
Solution Approach 2:
The patent introduces carrier dimension as an additional resource dimension for paging load distribution. By distributing paging traffic across the carrier dimension rather than concentrating it on a single carrier, the system increases paging capacity and reliability. Mobile stations are assigned to specific carriers in this dimension, allowing load distribution without requiring mobile stations to process information across all carriers
Data Source
AI summary
A method of allocating a paging carrier in a multi-carrier environment is disclosed. The method of allocating the paging carrier includes receiving a first message including first allocation information of the paging carrier, transmitting a second message for requesting entry into an idle mode to a base station; and receiving a third message including second allocation information of a changed paging carrier from the base station. At this time, the paging carrier includes a paging channel out of multiple carriers including one or more carriers.