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EP0675660A1
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EP
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Method for forming groups of communication terminals in a trunked radio system
Assignee: Alcatel Lucent SAS
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Filing: 1994-03-22
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Granted: —
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Expires: 2014-03-22
Abstract
Abstract A method is proposed in which groups are formed by first broadcasting a group definition message (GDM) in which a logical formula (LF) is included expressing conditions (C1-N) on classification parameters of terminals which may have to be included in such groups. Each of these terminals then checks for itself whether its classification parameters, such as individual and group addresses, satisfy this formula which consists in combining these conditions via logical operators (L1-(N-1)). If so, a dynamic group address (DGA) included in the group definition message is allocated to such a terminal such that it may subsequently be paged by using this dynamic group address.
Inventors
- 👤 Serge Camille Cyrille Raes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 19:57
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02; H04W84/04; H04W84/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
Method for forming a group of communication terminals out of a plurality of communication terminals (MS1-N) through allocating to each of said terminals of said group a dynamic group address (DGA) associated with said group, characterized in that it includes the following steps: - broadcasting to said plurality of terminals (MS1-N) a group definition message (GDM) in which said dynamic group address (DGA) is bound to one or more conditions (C1-N) regarding one or more classification parameters of said terminals; - checking in each of said terminals (MS1-N) whether its said classification parameters satisfy said conditions; and, - allocating said dynamic group address to each of said terminals in which said conditions are thus satisfied.
Claim 2
Dependent Claim
78 words
Method according to claim 1, characterized in that said dynamic group address (DGA) is bound to a logical formula (LF) included in said group definition message (GDM) as a string of said one or more conditions (C1-N) and logical operators (L1-(N-1)) and in that each of said conditions are associated to an identifier (OP) indicating to which type of classification parameter it applies as well as which requirement a said classification parameter of said type is to meet.
Claim 3
Dependent Claim
46 words
Method according to claim 2, characterized in that, for one of said conditions, said type is an address of a specific fixed length, said requirement being that at least one of said addresses of a said communication terminal equals a parameter included in said one condition.
Claim 4
Dependent Claim
68 words
Method according to claim 3, characterized in that, for one of said conditions, said type is an address of a specific fixed length, said requirement being that at least one of said addresses of a said communication terminal equals a first parameter in all symbol positions in which a second said parameter has a predetermined value, both said first and second parameters being included in said one condition.
Claim 5
Dependent Claim
51 words
Method according to claims 3 or 4, characterized in that said address is either an individual address which is unique to one of said terminals or a group address common to a plurality of said terminals, each said individual or group address being a uniquely assigned word of said fixed length.
Claim 6
Dependent Claim
21 words
Method according to claim 5, characterized in that said dynamic group address is a said group address with said specific length.
Claim 7
Dependent Claim
47 words
Method according to claim 3, characterized in that, for one of said conditions, said type is a subscriber access class, said requirement being that a said subscriber access class of a said mobile terminal is equal to or larger than a parameter included in said one condition.
Claim 8
Dependent Claim
53 words
Method according to any of the previous claims for paging said group of communication terminals, characterized in that it includes the further steps of broadcasting a paging message including said dynamic group address (DGA) and of processing said paging message in each of said terminals to which said dynamic group address is allocated.
Claim 9
Dependent Claim
30 words
Method according to claim 8, characterized in that said paging message is an access define message defining access opportunities to a transmission medium shared between said terminals for said group.
Claim 10
Dependent Claim
62 words
Method according to claim 9, characterized in that said access opportunities are access codes and that a second said paging message is broadcast to said terminals, said second paging message being an access assign message for assigning channels of said shared transmission medium to said access codes, said terminals of said group being allowed to attempt access on said thus assigned channels.
Claim 11
Dependent Claim
121 words
Method according to claim 9 when referring back to any of the claims 2 to 7 characterized in that, for one of said conditions (C1-N), said type is a message priority, said requirement being that a said message priority is larger than or equal to a parameter included in said one condition, and in that said dynamic group address (DGA) is allocated to said communication terminal whilst indicating the lowest message priority for which it is valid if said formula is satisfied for at least one of said message priorities, and in that said terminal is only allowed to use said access opportunities for messages of a said message priority larger than or equal to said thus indicated lowest message priority.
References Cited (Backward Citations)
WO1987001537A1
Cited
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