Method and apparatus for mobility impact mitigation in a packet data communication system
First Claim
1. A method of cell reselection by a mobile station communicating with a serving cell comprising:
- receiving from said serving cell an information element having an indicator corresponding to the routing area of each of a set of neighbor cells;
comparing a neighbor cell routing area to said serving cell routing area; and
executing a reselection decision in response to comparing said neighbor cell routing area to said serving cell routing area.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for mitigating the impact of lost data due to cell reselection for mobile stations operating in packet data transfer mode is described. A mobile station may perform cell reselection 2 to 4 times per minute when located in an urban area, even if the mobile station remains stationary. A mobile station moving through a communications network (100) may cross over various cell and routing area boundaries. Further, a mobile station operating in push-to-talk mode may lose up to 8 seconds of data when reselecting a cell in a new routing area.
A serving cell transmits an information element (301, 303, 305) in which the mobile station is informed whether cells in its neighbor list are in the same routing area as its serving cell. If the radio link to the serving cell is acceptable then the mobile station avoids reselection to cells outside its serving cell routing area.
14 Citations
35 Claims
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1. A method of cell reselection by a mobile station communicating with a serving cell comprising:
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receiving from said serving cell an information element having an indicator corresponding to the routing area of each of a set of neighbor cells;
comparing a neighbor cell routing area to said serving cell routing area; and
executing a reselection decision in response to comparing said neighbor cell routing area to said serving cell routing area. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of cell reselection by a mobile station communicating with a serving cell comprising:
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receiving from said serving cell an information element having an indicator corresponding to the routing area of each of a set of neighbor cells;
estimating a reselection time delay for said neighbor cell;
comparing said reselection time delay to a threshold value; and
executing a reselection decision in response to comparing said reselection time delay to said threshold value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of cell reselection by a mobile station communicating with a serving cell comprising:
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receiving from said serving cell, a radio link budget criteria for packet transfer mode operation;
determining whether said radio link budget criteria is acceptable for said serving cell; and
executing a reselection decision in response to determining whether said radio link budget criteria is acceptable for said serving cell. - View Dependent Claims (16, 17, 18)
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19. A communications system comprising:
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at least one base transceiver station configurable to transmit an information element for indication of whether neighbor list base transceiver stations are associated with a routing area; and
at least one mobile station configurable to receive said information element and to avoid cell reselection based upon said information element. - View Dependent Claims (20, 21, 22, 23)
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24. A communication system comprising:
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at least one base transceiver station configurable to transmit a mode specific radio link budget parameter; and
at least one mobile station configurable to receive said mode specific radio link budget parameter and to determine whether to perform cell reselection based upon said mode specific radio link budget parameter. - View Dependent Claims (25)
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26. A method of selecting reselection criteria by a mobile station communicating with a serving cell comprising:
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determining whether a terminal mode of the mobile station is one of a packet data mode and a push-to-talk mode;
executing a first reselection process in response to determining that the mobile station is in the packet data mode; and
executing a second reselection process in response to determining that the mobile station is in the push-to-talk mode. - View Dependent Claims (27, 28, 29, 30)
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31. A method of selecting reselection criteria by a mobile station communicating with a serving cell comprising:
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determining whether a terminal mode of the mobile station is one of a packet data mode and a push-to-talk mode;
executing a first reselection process in response to determining that the mobile station is in the packet data mode; and
executing a second reselection process in response to determining that the mobile station is in the push-to-talk mode. - View Dependent Claims (32, 33, 34, 35)
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Specification