Method and apparatus for communication system access
First Claim
1. A method of controlling access to a communication resource comprising:
- (a) determining from system parameters a first persistence value for a first group of communication units and a second persistence value for a second group of communication units, the first group having a higher priority for communication than the second group; and
(b) transmitting an access control message including the first and second persistence values.
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Accused Products
Abstract
A method and apparatus for accessing a communication system relies on the use of varying access probabilities for subscribers or messages of varying priority. A serving infrastructure entity (e.g., a base station) determines access probabilities (e.g., phi and plo where there are two classes of subscribers) in response to known system parameters like the current rate of access attempts for each priority class of user/message. Values representative of these access probabilities are then transmitted to the subscriber unit(s), for example by use of a system broadcast channel or control channels. These values are then used by the subscriber units in determining when to access an uplink channel. A temporal and/or proportional priority distribution approach is preferably used in determining the access values. As a result of this contention-based prioritization, an expedited access is achieved by higher priority units/traffic, thus increasing their throughput.
347 Citations
25 Claims
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1. A method of controlling access to a communication resource comprising:
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(a) determining from system parameters a first persistence value for a first group of communication units and a second persistence value for a second group of communication units, the first group having a higher priority for communication than the second group; and (b) transmitting an access control message including the first and second persistence values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling access to a communication resource comprising:
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(a) determining from system parameters a first access value for a first group of communication units and a second access value for a second group of communication units, the first group having a higher priority for communication than the second group; and (b) transmitting an access control message including the first and second access values, wherein step (a) further comprises; (i) determining an approximate number v of ready communication units of both first and second groups; (ii) determining a first access probability p1 for the first group based on the approximate number v of ready communication units, a proportion α
of access requests by the first group to a total number of access requests by the first and second groups during a predetermined period, and an approximate maximum channel throughput value β
, such that p1 =(1+α
)(β
/v); and(iii) determining a second access probability p2 for the second group based on v, α and
β
such that p2 =α
β
/v.
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9. A method of accessing a communication resource of a base station comprising, at a first communication unit:
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(a) receiving an access control message for the communication resource including a first persistence value for a first group of communication units and a second persistence value for a second group of communication units, the first group having a higher priority for access to the communication resource than the second group; (b) selecting one of the first and second persistence values based on which one of the first and second groups the first communication unit is currently a member; and (c) determining a probability of sending an access message using said one of the first and second persistence values selected in step (b), and then sending the access message with a determined probability on the communication resource. - View Dependent Claims (10, 11, 12)
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13. A method of accessing a communication resource of a base station comprising at a first communication unit:
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(a) receiving an access control message for the communication resource including a first access value for a first group of communication units and a second access value for a second group of communication units, the first group having a higher priority for access to the communication resource than the second group; (b) selecting one of the first and second access values based on which one of the first and second groups the first communication unit is currently a member; and (c) determining a probability of sending an access message using said one of the first and second access values selected in step (b), and then sending the access message on the communication resource with a determined probability, wherein the access control message includes an inhibit message for the second group, and step (c) further comprises inhibiting the access message in response to the inhibit message.
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14. A method of accessing a communication resource of a base station comprising, at a first communication unit:
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(a) receiving an access control message for the communication resource including a first access value for a first group of communication units and a second access value for a second group of communication units, the first group having a higher priority for access to the communication resource than the second group; (b) selecting one of the first and second access values based on which one of the first and second groups the first communication unit is currently a member; and (c) determining a probability of sending an access message using said one of the first and second access values selected in step (b), and then sending the access message on the communication resource with a determined probability, wherein the access control message includes an indication that in a current period of plural access periods access messages from the second group are to be inhibited, step (c) further comprising inhibiting the access message in response to the access control message when the first communication unit is one of the second group of communication units. - View Dependent Claims (15)
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16. A communication system having a communication resource for use in accessing the communication system, comprising:
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a base station transceiver adapted for communication to plural communication units; a controller in communication with the transceiver operable for determining from system parameters a first persistence value for a first group of the communication units and a second persistence value for a second group of the communication units, the first group having a higher priority for access to the communication resource than the second group; and wherein the base station transceiver is responsive to the controller to transmit an access control message including the first and second persistence values. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A communication unit for communicating in a communication system comprising:
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a transceiver for receiving an access control message including at least first and second persistence values from a base station of the system; and a processor operable for selecting a probibility of sending an access request based on a current priority level of the communication unit and a persistence value of the first and second persistence values that corresponds to the current priority level. - View Dependent Claims (23, 24, 25)
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Specification