[특허]Method for radio bearer optimization through an adaptive access probability factor

Motorola, Inc.

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Method for radio bearer optimization through an adaptive access probability factor

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-007/216 H04B-007/204
미국특허분류(USC)	370/335; 370/342
출원번호	US-0874763 (2004-06-22)
발명자 / 주소	Cai,Zhijun Al Bakri,Ban Burbidge,Richard C.
출원인 / 주소	Motorola, Inc.
인용정보	피인용 횟수 : 7 인용 특허 : 0

초록
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A communication system determines whether to establish a point-to-point or point-to-multipoint communication for conveyance of Multimedia Broadcast Multicast Services (MBMS) data based on a number of user equipments being serviced by the communication system for MBMS service. The system broadcasts an access probability factor in a control message to the user equipments. For a large number of MBMS users being counted, the method will select a point-to-multipoint broadcast. If the number of user equipments being counted is relatively small, the access probability factor is modified by a ratio of the number of point-to-point connections over the point-to-multipoint connections over the number of users being counted. The UE may need to join multiple base stations' in the counting procedure to obtain the system diversity gain.

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청구항
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The invention claimed is: 1. A method for adapting an access probability for a Multimedia Broadcast Multicast Service (MBMS) service for a communication system comprising: determining a quantity of mobile stations subscribed to the MEMS service; setting an initial access probability factor; broadcasting a control message comprising the initial access probability factor; receiving from one or more mobile stations, a response to the control message; determining whether a number of received responses from the mobile stations is zero; and if the number of received responses is not zero, adapting a new access probability factor equal to the initial access probability factor multiplied by a ratio of a number of point-to-point connections divided by a number of point-to-multipoint connections to the number of received responses. 2. The method as claimed in claim 1, wherein there is further included a step of if the number of received responses is zero, setting the new access probability factor equal to 1. 3. The method as claimed in claim 2, wherein if the number of received responses is not equal to zero, there is further included a step of determining whether the new access probability factor is greater than a threshold value. 4. The method as claimed in claim 3, wherein if the new access probability factor is greater than the threshold value, there is further included a step of setting the new access probability factor equal to 1. 5. The method as claimed in claim 4, wherein there is further included a step of determining whether the new access probability factor is greater than 1. 6. The method as claimed in claim 5 wherein if the new access probability factor is greater than 1, there is further included a step of selecting a point-to-point broadcast communication for access to the MBMS service. 7. The method as claimed in claim 6, wherein if the new access probability factor is greater than 1 there is further included a step of adjusting the initial access probability factor to be equal to the new access probability factor. 8. The method as claimed in claim 1, wherein after the step of receiving from one or more mobile stations, there is further included a step of determining whether the number of received responses is greater than a ratio of point-to-point connections to a number of point-to-multipoint connections. 9. The method as claimed in claim 8, wherein if the ratio of the number of received responses is greater than the ratio of the number of point-to-point connections to the number of point-to-multipoint connections, there is further included a step of selecting a point-to-multipoint broadcast for MBMS service. 10. The method as claimed in claim 9, wherein there is further included a step of adjusting the initial access probability factor to be equal to the new access probability factor multiplied by a ratio of the number of point-to-point connections divided by the number of point-to-multipoint connections to the number of received responses. 11. The method as claimed in claim 1, wherein the communication system includes a Code Division Multiple Access (CDMA) communication system. 12. The method as claimed in claim 1, wherein the communication system includes a General Packet Radio Service (GPRS) communication system. 13. The method as claimed in claim 1, wherein the communication system includes an Orthogonal Frequency Division Multiple Access (OFDM) communication system. 14. A method for adapting an access probability for a Multimedia Broadcast Multicast Service (MBMS) service for a communication system comprising: determining a quantity of mobile stations subscribed to the MBMS service; setting an initial access probability factor; broadcasting a control message comprising the initial access probability factor; receiving from one or more mobile stations, a response to the control message; determining whether a number of received responses from the mobile stations is zero; if the number of received responses is not zero, adapting a new access probability factor equal to the initial access probability factor multiplied by a ratio of the number of point-to-point connections divided by the number of point-to-multipoint connections to the number of received responses; and determining by a mobile station whether a control connection between the mobile station and the communication system exists. 15. The method as claimed in claim 14, wherein if the control connection does not exist, there is further included a step of selecting a random number between zero and one. 16. The method as claimed in claim 15, wherein there is further included a step of determining whether the selected random number is less than the new access probability factor. 17. The method as claimed in claim 16, wherein if the selected random number is less than the new access probability factor, there is further included a step of establishing by the mobile station a connection with the communication system. 18. The method as claimed in claim 14, wherein there is further included a step of if the number of received responses is zero, setting the new access probability factor equal to 1. 19. The method as claimed in claim 18, wherein if the number of received responses is not equal to zero, there is further included a step of determining whether the new access probability factor is greater than a threshold value. 20. The method as claimed in claim 19, wherein if the new access probability factor is greater than the threshold value, there is further included a step of setting the new access probability factor equal to 1. 21. The method as claimed in claim 20, wherein there is further included a step of determining whether the new access probability factor is greater than 1. 22. The method as claimed in claim 21, wherein if the new access probability factor is greater than 1, there is further included a step of selecting a point-to-point broadcast communication for access to the MBMS service. 23. The method as claimed in claim 22, wherein if the new access probability factor is greater than 1 there is further included a step of adjusting the initial access probability factor to be equal to the new access probability factor. 24. The method as claimed in claim 14, wherein after the step of receiving from one or more mobile stations, there is further included a step of determining whether the number of received responses is greater than a ratio of a number of point-to-point connections to a number of point-to-multipoint connections. 25. The method as claimed in claim 24, wherein if the ratio of the number of received responses is greater than the ratio of the number of point-to-point connections to the number of point-to-multipoint connections, there is further included a step of selecting a point-to-multipoint broadcast for MBMS service. 26. The method as claimed in claim 25, wherein there is further included a step of adjusting the initial access probability factor to be equal to the new access probability factor multiplied by a ratio of the number of point-to-point connections divided by the number of point-to-multipoint connections to the number of received responses. 27. The method as claimed in claim 14, wherein the step of determining whether a control connection exists includes a step of counting by a base station of the communication system the mobile station as an MBMS service user. 28. The method as claimed in claim 27, wherein the step of counting includes a step of counting the mobile station as an MBMS service user by each of a plurality of base stations of the communication system having a control connection with the mobile station.

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Method for radio bearer optimization through an adaptive access probability factor

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Method for radio bearer optimization through an adaptive access probability factor

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