[특허]Dynamic channel quality measurement procedure for adaptive modulation and coding techniques

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-017/00
출원번호	US-0029569 (2001-12-21)
발명자 / 주소	Terry, Stephen E. Dick, Stephen G. Miller, James M. Zeira, Eldad Zeira, Ariela
출원인 / 주소	InterDigital Technology Corporation
대리인 / 주소	Volpe and Koenig, P.C.
인용정보	피인용 횟수 : 26 인용 특허 : 15

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A wireless digital communication method for communicating between a base station and a plurality of user equipment mobile terminals (UEs) and employs adaptive modulation and coding (AM&C) to achieve improved radio resource utilization and provide optimum data rates for user services. Blocks of downl

A wireless digital communication method for communicating between a base station and a plurality of user equipment mobile terminals (UEs) and employs adaptive modulation and coding (AM&C) to achieve improved radio resource utilization and provide optimum data rates for user services. Blocks of downlink (DL) data are received by the base station which requests downlink DL channel quality measurements only from those mobile terminals (UEs) with pending downlink transmissions. The UEs respond to the request by measuring and reporting DL channel quality to the base station, which then allocates resources such that the UEs will make best use of radio resources. The base station notifies the UEs of the physical channel allocation indicating the modulation/coding rate and allocated slots followed by transmission of blocks of downlink data which are transmitted to the UEs.

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1. A method of optimizing downlink data transfer in a wireless communication system including a base station and a plurality of mobile terminals (MTs), said method comprising:(a) in response to said base station receiving blocks of downlink data designated for transmission to at least one of said MT

1. A method of optimizing downlink data transfer in a wireless communication system including a base station and a plurality of mobile terminals (MTs), said method comprising:(a) in response to said base station receiving blocks of downlink data designated for transmission to at least one of said MTs, said base station transmitting a request for said at least one MT to perform a downlink channel quality measurement;(b) in response to said at least one MT receiving said request from said base station, said at least one MT performing said downlink channel quality measurement and reporting the downlink channel quality measurement to the base station;(c) in response to said base station receiving said downlink channel quality measurement from said at least one MT, said base station allocating a plurality of radio resources to said at least one MT; and(d) said base station transmitting said designated blocks of downlink data to said at least one MT in accordance with said allocation after said at least one MT responds to said request. 2. The method of claim 1 whereby said allocation includes modulation type, coding rate and timeslot(s). 3. The method of claim 1 further including said at least one MT, responsive to receipt of said allocation, preparing for reception of downlink data in accordance with said allocation. 4. The method of claim 1 wherein method step (a) further includes said base station indicating specific slots for said measurement. 5. The method of claim 4 wherein step (b) further comprises said base station indicating which slots said at least one MT has been allocated for transmission to the base station. 6. The method of claim 1 wherein step (b) further includes said base station indicating the allocated slots to be used by said at least one MT. 7. The method of claim 2 wherein said at least one MT receives a transmission by the base station according to said allocation. 8. A method of optimizing downlink data transfer in a wireless communication system including a base station and a plurality of mobile terminals (MTs), said method comprising:(a) in response to said base station receiving blocks of downlink data designated for transmission to given ones of said MTs, said base station transmitting a request for each of said given MTs to perform a downlink channel quality measurement;(b) each of said given MTs performing said downlink channel quality measurement;(c) each of said given MTs transmitting the downlink channel quality measurement to the base station;(d) responsive to the downlink channel quality measurement received from each of the given ones of MTs reporting downlink channel quality, said base station determining preferred ones of the given ones of MTs which are capable of making best use of a plurality of radio resources;(e) said base station allocating time slots to be used by the preferred MTs; and(f) said base station transmitting said designated blocks of downlink data to said given MTs in accordance with said allocated time slots after said given MTs respond to said request. 9. A method of optimizing downlink data transfer in a wireless communication system including a base station and plurality of mobile terminals (MTs), said method comprising:(a) in response to said base station receiving blocks of downlink data designated for transmission to given ones of said MTs, said base station transmitting a request for each of said given MTs to perform a downlink channel quality measurement;(b) said base station determining preferred ones of the given ones of the MTs which are capable of making best use of a plurality of radio resources responsive to the downlink channel quality measurements received from the given ones of the MTs;(c) said base station allocating a given number of time slots to said preferred MTs according to the downlink channel quality measurements and the amount of downlink data available for transmission to said given MTs; and(d) said base station transmitting said designated block s of downlink data to said given MTs in accordance with said allocated time slots after said given MTs respond to said request. 10. A wireless communication system for optimizing downlink data transfer, the system comprising:(a) a plurality of mobile terminals (MTs); and(b) a base station in communication with the MTs, wherein:(i) in response to the base station receiving blocks of downlink data designated for transmission to at least one of the MTs, the base station transmits a request for the at least one MT to perform a downlink channel quality measurement;(ii) in response to the at least one MT receiving the request from the base station, the at least one MT performs the downlink channel quality measurement and reports the downlink channel quality measurement to the base station;(iii) in response to the base station receiving the downlink channel quality measurement from the at least one MT, the base station allocates a plurality of radio resources to the at least one MT; and(iv) the base station transmits the designated blocks of downlink data to the at least one MT in accordance with the allocation after the at least one MT responds to the request. 11. The system of claim 10 whereby the allocation includes modulation type, coding rate and timeslot(s). 12. The system of claim 11 wherein the at least one MT receives a transmission by the base station according to the allocation. 13. The system of claim 10 wherein the at least one MT, responsive to receipt of the allocation, preparing for reception of downlink data in accordance with the allocation. 14. The system of claim 10 wherein the base station indicates specific slots for the measurement. 15. The system of claim 14 wherein the base station indicates which slots the at least one MT has been allocated for transmission to the base station. 16. The system of claim 10 wherein the base station indicates the allocated slots to be used by the at least one MT. 17. A wireless communication system for optimizing downlink data transfer, the system comprising:(a) a plurality of mobile terminals (MTs); and(b) a base station in communication with the MTs, wherein:(i) in response to the base station receiving blocks of downlink data designated for transmission to given ones of the MTs, the base station transmits a request for each of the given MTs to perform a downlink channel quality measurement;(ii) each of the given MTs performs the downlink channel quality measurement;(iii) each of the given MTs transmits the downlink channel quality measurement to the base station;(iv) responsive to the downlink channel quality measurement received from each of the given ones of MTs reporting downlink channel quality, the base station determines preferred ones of the given ones of MTs which are capable of making best use of a plurality of radio resources;(v) the base station allocates time slots to be used by the preferred MTs; and(vi) the base station transmits the designated blocks of downlink data to the given MTs in accordance with the allocated time slots after the given MTs respond to the request. 18. A wireless communication system for optimizing downlink data transfer, the system comprising:(a) a plurality of mobile terminals (MTs); and(b) a base station in communication with the MTs, wherein:(i) in response to the base station receiving blocks of downlink data designated for transmission to given ones of the MTs, the base station transmitting a request for each of the given MTs to perform a downlink channel quality measurement;(ii) the base station determining preferred ones of the given ones of the MTs which are capable of making best use of a plurality of radio resources responsive to the downlink channel quality measurements received from the given ones of the MTs;(iii) the base station allocating a given number of time slots to the preferred MTs according to the downlink channel quality measurements and the amount of downlink data available for transmission to the given MTs; and(iv ) the base station transmitting the designated blocks of downlink data to the given MTs in accordance with the allocated time slots after the given MTs respond to the request.

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