| 摘要 |
In a packet radio system (e.g. a GPRS), a network (BSS) has two different alternatives for allocating a radio resource to a mobile sta-tion (MS). In a first allocation alternative the ra-dio resource is allocated using an uplink counter block identifier (USF) transmitted with down-link blocks. In a second allocation alterna-tive the radio resource is allocated in a sepa-rate signalling message. A corresponding down-link block then also has an uplink counter block identifier (USF) which can acquire only a lim-ited number of possible values. If all identifiers (USF) are allocated to different mobile stations, allocation alternative 2 cannot be used. In the invention the network leaves at least one identi-fier (USF) unallocated to any mobile station. In addition, the network either (1) uses the identi-fier in downlink blocks corresponding to blocks reserved using the second allocation alternative; or (2) at least one uplink counter block identifier (USF) is separately determined, said identifier denoting a reserved uplink block which the mo-bile station cannot use for transmission without a separate authorisation.
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