Method and apparatus for detecting a cell reselection
OwnerTushar Raval, Damodaran Vasudevaninventors
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Abstract
A wireless infrastructure includes a source base transceiver station (BTS) that provides communication services to a mobile station (MS), a target BTS, a packet control unit (PCU) in communication with the target BTS, and a Serving GPRS Support Node (SGSN) in communication with the PCU. The PCU detects a cell reselection by the MS and initiates a cell reselection procedure in the infrastructure without first receiving a FLUSH_LL message from the SGSN based on messages received by the PCU from the MS via the target BTS and a record of the MS maintained by, or in association with, the PCU.
Claims23
In a packet data communication system comprising a source base station subsystem (BSS), a target BSS, and a mobile station serviced by the source BSS, a method for detecting a cell reselection without an intervention of a Serving GPRS Support Node (SGSN) comprising steps of:
- maintaining a record of at least one active mobile station;
- receiving, from a mobile station of the at least one active mobile station, a message requesting allocation of a communication channel at the target BSS;
- in response to receipt of the communication channel allocation request, allocating a communication channel at the target BSS to the mobile station;
- informing the mobile station of the allocated communication channel;
- receiving, by the target BSS from the mobile station, uplink data that includes a mobile station identifier associated with the mobile station;
- and
- determining, based on the uplink data and by reference to the record, that the mobile station has initiated a cell reselection.
In a packet data communication system comprising a source base station subsystem (BSS), a target BSS, and a mobile station serviced by the source BSS, a method for detecting a cell reselection without an intervention of a Serving GPRS Support Node (SGSN) comprising steps of:
- maintaining a record of at least one active mobile station;
- receiving, from a mobile station of the at least one active mobile station, a message requesting allocation of a communication channel at the target BSS;
- in response to receipt of the communication channel allocation request, allocating a communication channel at the target BSS to the mobile station;
- informing the mobile station of the allocated communication channel;
- initiating a count down of a predetermined time period;
- and
- when no uplink data is received via the source BSS after the initiation of the count down and prior to the expiration of the predetermined time period, determining that the mobile station has performed a cell reselection.
A packet control unit comprising:
- a memory device that maintains a record of at least one active mobile station;
- and
- a processor operably coupled to the memory device that receives, from a mobile station of at least one active mobile station, a message requesting allocation of a communication channel at a target base station subsystem (BSS), allocates a communication channel at the target BSS to the mobile station, informs the mobile station of the allocated communication channel, receives, from the mobile station and via the target BSS, uplink data, and determines, based on the uplink data and by reference to the record, that the mobile station has initiated a cell reselection.
A packet control unit comprising:
- a memory device that maintains a record of at least one active mobile station;
- a timer;
- and
- a processor operably coupled to each of the memory device and the timer that receives, from a mobile station of at least one active mobile station, a message requesting allocation of a communication channel at a target base station subsystem (BSS), allocates a communication channel at the target BSS to the mobile station, initiates a count down of a predetermined time period with reference to the timer and, when no uplink data is received by the packet control unit via the source base station subsystem after the initiation of the count down and prior to the expiration of the predetermined time period, determines that the mobile station has performed a cell reselection.
Dependencies are inferred from the claim text.