Method for channel allocation in an ad-hoc radio communication system
First Claim
1. Method for channel allocation in an ad-hoc radio communication system comprising devices having an equivalent communication architecture, the devices being gathered in several piconets, the devices of a same piconet being able to communicate with one another, a piconet coordinator (PNC) being defined among the devices for each piconet, the multiple access scheme for the radio communication between the devices being a Code Division Multiple Access (CDMA) scheme, characterized in that the set of available codes is split into pre-defined disjoined subsets of codes (Ci), all the subsets of codes (Ci) being known by each device, and all the devices of a same piconet using codes in the same associated subset of codes (Ci) for communicating with one another, and in that for each new device added in the ad-hoc radio communication system, it includes the following steps:
- the new device scans its radio environment looking for at least one used subset of codes (Ci) which is associated to a piconet, depending on the or each found used subset of codes (Ci);
the new device becomes a piconet coordinator (PNC) of a new piconet and selects a subset of codes (Ci) for the new piconet, or the new device decides to join an existing piconet among a set of available piconets, the subset of codes of which is already used and uses said subset of codes for the next communications with other devices of the joined piconet.
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Abstract
The invention concerns a method for channel allocation in an ad-hoc radio communication system comprising devices gathered in several piconets. A piconet coordinator (PNC) is defined for each piconet. A Code Division Multiple Access (CDMA) scheme is implemented. The set of available codes is split into pre-defined disjoined subsets of codes (CI) known by each device.
For each new device added in the system, the method includes the following steps:
the new device scans its radio environment looking for at least one used subset of codes (Ci) which is associated to a piconet,
depending on the or each found used subset of codes (Ci)
the new device becomes a piconet coordinator (PNC), or
the new device joins an existing piconet among a set of available piconets.
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Citations
12 Claims
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1. Method for channel allocation in an ad-hoc radio communication system comprising devices having an equivalent communication architecture, the devices being gathered in several piconets, the devices of a same piconet being able to communicate with one another, a piconet coordinator (PNC) being defined among the devices for each piconet, the multiple access scheme for the radio communication between the devices being a Code Division Multiple Access (CDMA) scheme,
characterized in that the set of available codes is split into pre-defined disjoined subsets of codes (Ci), all the subsets of codes (Ci) being known by each device, and all the devices of a same piconet using codes in the same associated subset of codes (Ci) for communicating with one another, and in that for each new device added in the ad-hoc radio communication system, it includes the following steps: -
the new device scans its radio environment looking for at least one used subset of codes (Ci) which is associated to a piconet, depending on the or each found used subset of codes (Ci);
the new device becomes a piconet coordinator (PNC) of a new piconet and selects a subset of codes (Ci) for the new piconet, or the new device decides to join an existing piconet among a set of available piconets, the subset of codes of which is already used and uses said subset of codes for the next communications with other devices of the joined piconet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Device for an ad-hoc radio communication system, said system comprising devices having an equivalent communication architecture, the devices being gathered in several piconets, the device being able to communicate with other devices of a same piconet by implementing a Code Division Multiple Access (CDMA) transmission method,
characterized in that the set of available codes is split into pre-defined disjoined subsets of codes (Ci), the device comprises means in which all the subsets of codes (Ci) are stored, and the device is adapted to use the codes from a subset of codes (Ci) associated to a piconet for communicating with other devices of the piconet, and in that the device includes: -
means for scanning the radio environment looking for at least one used subset of codes (Ci) which is associated to a piconet when the device is added in the ad-hoc radio communication system, and means for;
becoming a piconet coordinator (PNC) of a new piconet and selecting a subset of codes (Ci) for the new piconet, or joining an existing piconet among a set of available piconets, the subset of codes of which is already used and using said subset of codes for the next communications with other devices of the joined piconet, depending on the or each found used set of codes (Ci).
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12. Ad-hoc radio communication system comprising devices having an equivalent communication architecture, the devices being gathered in several piconets, the devices of a same piconet being able to communicate with one another, each piconet including a piconet coordinator (PNC), the multiple access scheme for the radio communication between the devices being a Code Division Multiple Access (CDMA) scheme,
characterized in that the set of available codes is split into pre-defined disjoined subsets of codes (Ci), all the subsets of codes (Ci) being known by each device, and all the devices of a same piconet using codes in the same associated subset of codes (Ci) for communicating with one another, and in that each device includes: -
means for scanning the radio environment looking for at least one used subset of codes (Ci) which is associated to a piconet when the device is added in the ad-hoc radio communication system, and means for;
becoming a piconet coordinator (PNC) of a new piconet and selecting a not yet used subset of codes (Ci) for the new piconet, or joining an existing piconet among a set of available piconets, the subset of codes of which is already used and using said subset of codes for the next communications with other devices of the joined piconet, depending on the or each found used set of codes (Ci).
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Specification