IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0432298
(2009-04-29)
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등록번호 |
US-8325648
(2012-12-04)
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발명자
/ 주소 |
- Shah, Maulik K.
- Sigg, Jason P.
- Singh, Jasinder P.
- Bhan, Ashish
- Singh, Anil
- Shetty, Manoj
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
6 인용 특허 :
53 |
초록
▼
Methods and systems for assigning a wireless communication device to a carrier frequency are presented. In an exemplary embodiment, a radio access network (RAN) radiates to define one or more wireless coverage areas using at least two different carrier frequencies. A given wireless communication dev
Methods and systems for assigning a wireless communication device to a carrier frequency are presented. In an exemplary embodiment, a radio access network (RAN) radiates to define one or more wireless coverage areas using at least two different carrier frequencies. A given wireless communication device (WCD) seeks to engage in a call, and accordingly transmits a probe message to the RAN. In response to receiving the probe message, and based at least on information associated with the probe message, the RAN determines an initial carrier frequency assignment for the given WCD. Preferably, this initial carrier frequency assignment is performed to balance load across at least some of the at least two different carrier frequencies. The RAN then transmits an indication of the carrier frequency assignment to the given WCD. The given WCD may then tune to the assigned carrier frequency and conduct communications using the assigned carrier frequency.
대표청구항
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1. A method, performed by a radio access network (RAN), wherein the RAN controls assignments of wireless communication devices (WCDs) to a first carrier frequency and a second carrier frequency, wherein the RAN radiates on the first carrier frequency to define a first wireless coverage area, wherein
1. A method, performed by a radio access network (RAN), wherein the RAN controls assignments of wireless communication devices (WCDs) to a first carrier frequency and a second carrier frequency, wherein the RAN radiates on the first carrier frequency to define a first wireless coverage area, wherein the RAN radiates on the second carrier frequency to define a second wireless coverage area, the method comprising: receiving in the RAN a probe message from a given WCD, wherein the probe message indicates that the given WCD is seeking to engage in a given call;determining an initial forward-link power for the given WCD based at least in part on information associated with the probe message;assigning the given WCD to engage in the given call using the first carrier frequency, wherein the assignment is based on at least (1) the determined initial forward-link power for the WCD, (2) a first forward-link power associated with the first carrier frequency, and (3) a second forward-link power associated with the second carrier frequency; andduring the given call, communicating with the given WCD on the first carrier frequency. 2. The method of claim 1, wherein determining the initial forward-link power for the WCD comprises: determining that the probe message received from the given WCD is one of an extent of probe messages received from the given WCD, wherein the extent of probe messages all indicate that the given WCD is seeking to engage in the call; anddetermining, from the extent of probe messages, the initial forward-link power for the given WCD. 3. The method of claim 2, wherein the RAN performs a plurality of assignments of WCDs to carrier frequencies, wherein each assignment of a WCD to a carrier frequency is based on an extent of probe messages received from the WCD for a call, the method further comprising: recording mappings for the assignments, wherein, for each assignment, a mapping correlates (i) the extent of probe messages received from the WCD for the call with (ii) an actual forward-link power associated with the WCD during at least part of the call; andusing at least a most recent subset of the mappings as a further basis to determine the initial forward-link power for the given WCD. 4. The method of claim 1, further comprising: in response to receiving the probe message from the given WCD, determining a round trip delay between the RAN and the given WCD, wherein determining the initial forward-link power for the given WCD is also based on the determined round trip delay. 5. The method of claim 4, wherein determining the round trip delay comprises: transmitting, at a first time, a test message to the given WCD;receiving, at a second time, a response to the test message from the given WCD; andcalculating the round trip delay based on a difference between the second time and the first time. 6. The method of claim 4, wherein the RAN and the WCD communicate according to code division multiple access (CDMA) principles, wherein determining the round trip delay comprises: receiving, at a first time, an initial symbol of a CDMA code of the probe message from the WCD;reading, from the probe message, a timestamp representing a second time at which the probe message was transmitted; andcalculating the round trip delay based on a difference between the first time and the second time. 7. A method, performed by a radio access network (RAN), wherein the RAN performs assignments of wireless communication devices (WCDs) to carrier frequencies, wherein on each carrier frequency the RAN radiates to define a wireless coverage area, the method comprising: recording mapping data for the assignments, wherein the mapping data specifies respectively, for each assignment of a WCD to a carrier frequency for a call, a correlation between (i) an extent of probe messages transmitted by the WCD in an effort to engage in the call and (ii) an actual forward-link capacity factor associated with the WCD during at least part of the call;receiving into the RAN, from a given WCD, a given probe message indicating that the given WCD is seeking to engage in a given call;determining an initial forward-link capacity factor for the given call based at least in part on information in the given probe message and the mapping data;selecting one of the carrier frequencies based at least in part on (i) the determined initial forward-link capacity factor for the given call and (ii) forward-link capacity factors respectively associated with each carrier frequency;assigning the given WCD to operate on the selected carrier frequency; andduring the given call, communicating with the given WCD on the selected carrier frequency. 8. The method of claim 7, wherein selecting one of the carrier frequencies is also based on an adjacent wireless coverage area being defined using the selected carrier frequency. 9. The method of claim 7, wherein information in the given probe message comprises an indication of an extent of probe messages sent by the given WCD in an effort to engage in the given call. 10. The method of claim 7, wherein selecting one of the carrier frequencies is also based on reverse-link powers respectively associated with each carrier frequency. 11. The method of claim 7, wherein the given WCD receives the given call and the probe message is of a type selected from the group consisting of a page response message and an origination message. 12. A radio access network (RAN) component, wherein the RAN component performs assignments of wireless communication devices (WCDs) to carrier frequencies, wherein on each carrier frequency the RAN currently radiates to define a wireless coverage area, the RAN component comprising: a processor;memory;program instructions stored in the memory and executable by the processor to store, in the memory, mappings between historical data representing: (1) extents of probe messages respectively received from a set of WCDs seeking to engage in calls, and (2) actual forward-link capacity factors used to communicate with each of the respective WCDs in the set, when each respective WCD is engaged in its respective call;program instructions stored in the memory and executable by the processor to receive into the RAN component, from a given WCD, a given probe message indicating that the given WCD is seeking to engage in a given call;program instructions stored in the memory and executable by the processor to determine an initial forward-link capacity factor for the given call based at least in part on information in the given probe message and historical data from the mappings;program instructions stored in the memory and executable by the processor to select one of the carrier frequencies based at least in part on (i) the determined initial forward-link capacity factor for the given call, and (ii) a current forward-link capacity factor respectively on each carrier frequency;program instructions stored in the memory and executable by the processor to assign the given WCD to operate on the selected carrier frequency; andprogram instructions stored in the memory and executable by the processor to communicate with the given WCD on the selected carrier frequency. 13. The RAN component of claim 12, wherein program instructions stored in the memory and executable by the processor to determine the forward-link capacity factor for the WCD comprise: program instructions stored in the memory and executable by the processor to determine that the probe message received from the WCD is one of an extent of probe messages received from the WCD, wherein each probe message of the extent of probe messages indicates that the WCD is seeking to engage in the call; andprogram instructions stored in the memory and executable by the processor to determine, from the extent of probe messages, the forward-link capacity factor for the WCD. 14. The RAN component of claim 12, wherein information in the probe message comprises an indication of a number of probe messages sent by the WCD in order to engage in the call, the RAN component further comprising: program instructions stored in the memory and executable by the processor to read the number from the probe message, and wherein program instructions stored in the memory and executable by the processor to select one of the carrier frequencies comprise program instructions stored in the memory and executable by the processor to select one of the carrier frequencies also based on the number. 15. The RAN component of claim 12, wherein the first carrier frequency is also used to define a third wireless coverage area, wherein the third wireless coverage area is adjacent to the first wireless coverage area, and wherein program instructions stored in the memory and executable by the processor to select one of the carrier frequencies comprise: program instructions stored in the memory and executable by the processor to select one of the carrier frequencies also based on (1) the third wireless coverage area using the first carrier frequency, and (2) the third wireless coverage area being adjacent to the first wireless coverage area. 16. The RAN component of claim 12, wherein program instructions stored in the memory and executable by the processor to select one of the carrier frequencies comprise: program instructions stored in the memory and executable by the processor to select one of the carrier frequencies also based on a round trip delay between the RAN and the WCD. 17. A method, performed by a radio access network (RAN), wherein the RAN controls assignments of wireless communication devices (WCDs) to a first carrier frequency and a second carrier frequency, wherein the RAN radiates on the first carrier frequency to define a first wireless coverage area, wherein the RAN radiates on the second carrier frequency to define a second wireless coverage area, the method comprising: receiving, in the RAN, a probe message from a given WCD, wherein the probe message indicates that the given WCD is seeking to engage in a given call;determining an initial forward-link data rate for the given WCD based at least in part on information associated with the probe message;assigning the given WCD to engage in the given call using the first carrier frequency, wherein the assignment is based on at least (1) the determined initial forward-link data rate for the WCD, (2) a first forward-link data rate associated with the first carrier frequency, and (3) a second forward-link data rate associated with the second carrier frequency; andduring the given call, communicating with the given WCD on the first carrier frequency.
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