Handover Method Using Time Offset in Mobile Communication
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Solution Overview
Problem
In wireless communication systems, the existing handover procedures in legacy systems lead to redundant resource overhead when transmitting information about legacy base stations to 16m mobile stations, which are capable of supporting both legacy and new communication schemes, as they require separate resource regions for different communication zones.
Innovation Solution
A method where a 16m mobile station receives a neighbor base station list broadcast message with time offset information from a serving base station, allowing it to synchronize with a specific zone and obtain information about legacy base stations efficiently, reducing the need for redundant information transmission across multiple zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate resource regions are used for different communication zones to transmit information about legacy base stations, then information transmission reliability is improved, but resource overhead increases
Solution Approach 1:
The patent merges the transmission of legacy base station information into the existing DCD/UCD message structure that is already broadcast in the MZone. Instead of creating separate resource regions for legacy base station information, the solution combines this information with the existing downlink channel descriptor and uplink channel descriptor messages, thereby eliminating redundant resource allocation while maintaining information transmission reliability.
Solution Approach 2:
The DCD/UCD message structure is enhanced to serve multiple functions: it continues to provide system operation parameters for 16m mobile stations while simultaneously carrying neighbor base station information for legacy base stations. This multi-functionality allows the same message to serve both new and legacy systems, reducing the need for separate dedicated resource regions.
2Loss of information
If neighbor base station information is broadcast in MOB_NBR_ADV message, then handover information availability is improved, but message complexity increases
Solution Approach 1:
The patent combines neighbor base station information with the existing DCD/UCD message structure rather than relying solely on separate MOB_NBR_ADV messages. By merging these information types into a unified message format, the solution reduces the number of separate messages that mobile stations must process, thereby reducing overall message complexity while maintaining complete handover information availability.
3Adaptability or versatility
If 16m mobile station scans for legacy base stations using legacy communication scheme, then handover capability is improved, but scanning time increases
Solution Approach 1:
The serving base station pre-processes and filters neighbor base station information, identifying which base stations support legacy communication schemes. This preliminary action allows the mobile station to receive a pre-filtered list of candidate legacy base stations through the DCD/UCD message, eliminating the need for the mobile station to perform extensive scanning and significantly reducing scanning time while maintaining full handover capability.
Solution Approach 2:
The serving base station acts as an intermediary that bridges the 16m mobile station and legacy base stations. Instead of requiring the mobile station to directly scan and discover legacy base stations, the serving base station retrieves and forwards relevant legacy base station information through the DCD/UCD message, thereby reducing the scanning burden on the mobile station while ensuring accurate handover information delivery.
Data Source
AI summary
Disclosed is a method for enabling a mobile terminal to perform a handover in a mobile communication system. A serving base station which supports both a first communication scheme and a second communication scheme can transmit, to the mobile terminal, a neighbor base station list broadcast message containing time offset information indicating the point of time to transmit information on a second base station which uses the second communication scheme and supports only the second communication scheme via a specific zone using the second communication scheme. The mobile terminal which has received the message can receive, from the serving base station, the information on the second base station via the specific zone on the basis of the received time offset information.