Method and apparatus for cell reselection
First Claim
1. A method for cell reselection at a client terminal in a wireless communication system, the method comprising:
- controlling, by a processing device at the client terminal, cell reselection for the client terminal based on determining a type of a neighbor cell for communication with the client terminal using the wireless communication system,wherein the type of the neighbor cell is determined based onwhether stored information about the neighbor cell which is valid is available, in which the information about the neighbor cell is from a broadcast in the neighbor cell using the wireless communication system and is received by and stored at the client terminal, anda determination, from the stored information which is valid, of a time of a next occurrence of a paging occasion (PO) in the neighbor cell in relation to a selected given time window to perform reselection to the neighbor cell from a current serving cell of the client terminal and at least two of (i) whether the neighbor cell is suitable or acceptable, (ii) whether the neighbor cell belongs to a current network registration area, (iii) whether the client terminal is registered to a current serving cell using a first Radio Access Technology (RAT) and a second RAT used by the neighbor cell which is different from the first RAT or (iv) whether network registration is required for inter-RAT cell reselection.
1 Assignment
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Accused Products
Abstract
In cellular communication systems, the success rate for incoming calls for a client terminal in idle mode is related to the successful reception of paging messages. The instances for paging message transmission, known as paging occasions, may be based on a client terminal'"'"'s unique identity. The network transmits a paging message addressed to a specific client terminal in its specific paging occasion. In addition to the reception of paging messages, a client terminal may be required to search and monitor neighbor cells for cell reselection and handoffs. A method and apparatus are disclosed that improve the cell reselection by using the known a priori information to categorize the neighbor cells, to categorize the cell reselection types, and to perform cell reselection to an appropriate neighbor cell at the opportune time such that a paging message reception may be neither missed nor delayed during the cell reselection.
11 Citations
20 Claims
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1. A method for cell reselection at a client terminal in a wireless communication system, the method comprising:
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controlling, by a processing device at the client terminal, cell reselection for the client terminal based on determining a type of a neighbor cell for communication with the client terminal using the wireless communication system, wherein the type of the neighbor cell is determined based on whether stored information about the neighbor cell which is valid is available, in which the information about the neighbor cell is from a broadcast in the neighbor cell using the wireless communication system and is received by and stored at the client terminal, and a determination, from the stored information which is valid, of a time of a next occurrence of a paging occasion (PO) in the neighbor cell in relation to a selected given time window to perform reselection to the neighbor cell from a current serving cell of the client terminal and at least two of (i) whether the neighbor cell is suitable or acceptable, (ii) whether the neighbor cell belongs to a current network registration area, (iii) whether the client terminal is registered to a current serving cell using a first Radio Access Technology (RAT) and a second RAT used by the neighbor cell which is different from the first RAT or (iv) whether network registration is required for inter-RAT cell reselection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for cell reselection at a client terminal in a wireless communication system, the apparatus comprising:
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circuitry configured to control at the client terminal cell reselection for the client terminal based on determining a type of a neighbor cell for communication with the client terminal using the wireless communication system, wherein the type of the neighbor cell is determined based on whether stored information about the neighbor cell which is valid is available, in which the information about the neighbor cell is from a broadcast in the neighbor cell using the wireless communication system and is received by and stored at the client terminal, and a determination, from the stored information which is valid, of a time of a next occurrence of a paging occasion (PO) in the neighbor cell in relation to a selected given time window to perform reselection to the neighbor cell from a current serving cell of the client terminal and at least two of (i) whether the neighbor cell is suitable or acceptable, (ii) whether the neighbor cell belongs to a current network registration area, (iii) whether the client terminal is registered to a current serving cell using a first Radio Access Technology (RAT) and a second RAT used by the neighbor cell which is different from the first RAT or (iv) whether network registration is required for inter-RAT cell reselection. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A wireless communication device comprising:
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a receiver to receive a signal of a wireless communication system; and a processing device configured to control cell reselection for the wireless communication device based on determining a type of a neighbor cell for communication with the wireless communication device using the wireless communication system, wherein the type of the neighbor cell is determined based on whether stored information about the neighbor cell which is valid is available, in which the information about the neighbor cell is from a broadcast in the neighbor cell using the wireless communication system and is received by and stored at the wireless communication device, and a determination, from the stored information which is valid, of a time of a next occurrence of a paging occasion (PO) in the neighbor cell in relation to a selected given time window to perform reselection to the neighbor cell from a current serving cell of the client terminal and at least two of (i) whether the neighbor cell is suitable or acceptable, (ii) whether the neighbor cell belongs to a current network registration area, (iii) whether the wireless communication device is registered to a current serving cell using a first Radio Access Technology (RAT) and a second RAT used by the neighbor cell which is different from the first RAT or (iv) whether network registration is required for inter-RAT cell reselection. - View Dependent Claims (20)
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Specification