Rehash timer for packet data communications
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsJan Lindskog, Gunnar Rydnell
Life of this patent
Estimating the term…
Abstract
The present invention provides a rehash timer in both the mobile station and the base station in order to synchronize the channel selection process in a radio communication system and to avoid the need to store long rehashing lists in the base station.
Claims8
A method for transmitting packet data between a base station and a mobile station in a radio communication system, said method comprising the steps of:
- determining a first channel on which information can be exchanged between said mobile station and said base station;
- transmitting on said first channel, from said base station to said mobile station, a Channel Reassignment message indicating that said mobile station is to rehash to a new channel;
- transmitting, from said mobile station to said base station, a confirmation message indicating receipt of said Channel Reassignment message;
- starting a rehash timer in said mobile station;
- starting, in response to said confirmation message, a rehash timer in said base station;
- rehashing to said new channel;
- and
- wherein, upon expiration of said rehash timers, said mobile station and said base station rehash back to said first channel.
A method for determining, by a radiocommunication system, a channel on which a mobile station is camping, the method comprising the steps of:
- providing a default algorithm by which said mobile station is assigned to a default channel;
- selectively reassigning said mobile station from said default channel to another channel;
- adding an association between said mobile station and said another channel to a list stored in said system;
- starting a timer;
- removing said association from said list when said timer expires;
- and
- determining said channel on which said mobile station is camping using at least one of said list and said default algorithm.
A method for determining, by a mobile station, a channel associated with a base station to which said mobile station is to be listening, the method comprising the steps of:
- receiving from said base station a Channel Reassignment message indicating that said mobile station is to rehash to a new channel;
- switching from listening to a first channel to listening to said new channel, said new channel also being transmitted by said base station;
- transmitting, from said mobile station to said base station, a confirmation message indicating receipt of said Channel Reassignment message;
- starting a rehash timer in said mobile station;
- and
- upon expiration of said rehash timers, said mobile station and said base station rehash back to said first channel.
A base station comprising:
- a transceiver for transmitting and receiving radio signals;
- a processor for controlling said transceiver;
- and
- a memory, said transceiver, processor and memory operative in combination to:
- transmit a Channel Reassignment message from said base station to a mobile station, said message indicating that said mobile station is to rehash from a first channel to a new channel;
- receive from said mobile station a confirmation message indicating receipt of said Channel Reassignment message;
- start, in response to said confirmation message, a rehash timer in said base station;
- and
- upon expiration of said rehash timer, said mobile station and said base station rehash back to said first channel.
Dependencies are inferred from the claim text.