MBS Channel Change in Broadband Wireless Systems
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Solution Overview
Problem
Conventional mobile WiMAX systems experience channel change delays due to the need for Dynamic Service Add procedures and reliance on DownLink MAP messages, which can result in incomplete reception of channel change information, especially when reception coverage is limited.
Innovation Solution
A method and apparatus for transmitting overall channel scheduling information, including group-based scheduling for Connection Identifiers (CIDs), using newly defined messages to facilitate MBS channel changes without requiring Dynamic Service Add procedures and improving coverage by extracting and using MBS channel scheduling information directly from the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal performs a Dynamic Service Add procedure to change channels in conventional mobile WiMAX, then the terminal can receive information regarding a new channel, but the channel change process causes delay
Solution Approach 1:
The base station transmits MBS channel scheduling information messages in advance before the terminal actually needs to change channels. This preliminary transmission of scheduling information allows the terminal to prepare for channel changes without waiting for on-demand information, thereby reducing channel change delay while maintaining reliability through proper scheduling coordination.
2Reliability
If a terminal waits to receive DL MAP from the base station to obtain channel change information, then the terminal can ensure information completeness, but the terminal may not receive channel change information when reception coverage of DL MAP is smaller than MBS
Solution Approach 1:
The patent segments the channel scheduling information into separate MBS channel scheduling information messages that can be transmitted independently from the DL MAP. This segmentation allows the terminal to receive channel change information through multiple pathways (both DL MAP and MBS channel scheduling information messages), ensuring information completeness regardless of reception coverage limitations while improving adaptability for channel changes.
3Measurement precision
If the terminal receives all data from the base station to determine MBS MAP message information, then the terminal can accurately determine channel information, but the process increases information reception time and complexity
Solution Approach 1:
The patent extracts and transmits only the necessary MBS channel scheduling information messages separately from the complete data set. This extraction approach allows the terminal to obtain accurate channel information directly from the scheduled messages without needing to process all data from the base station, thereby reducing information reception time while maintaining channel information accuracy through targeted extraction of relevant scheduling parameters.
Data Source
AI summary
An apparatus and a method for changing a Multicast and Broadcast Service (MBS) channel of a terminal in a broadband wireless communication system are provided. In the method, an overall channel scheduling information message comprising group information for Connection Identifications (CIDs) of all channels in service is received from a base station. Transmission information of an MBS channel scheduling information message corresponding to a group to which a CID of a current channel belongs is extracted from the overall channel scheduling information message. A relevant MBS channel scheduling information message is received from the base station using the extracted transmission information of the MBS channel scheduling information message. Transmission information of an MBS MAP message for a relevant CID is extracted from the MBS channel scheduling information message. Therefore, an MBS channel change of a terminal can be easily performed.