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Details
Inventors: Mustajarvi, Jari;
Assignee: Nokia Telecommunications Oy (Espoo, FI)
Primary Examiner: Le; Thanh Cong
Assistant Examiner: Le; Lana
Attorney, Agent or Firm: Pillsbury Winthrop LLP

In a packet radio system (e.g. a GPRS), a network (BSS) has two different alternatives for allocating a radio resource to a mobile station (MS). In a first allocation alternative the radio resource is allocated using an uplink counter block identifier (USF) transmitted with downlink blocks. In a second allocation alternative the radio resource is allocated in a separate signalling message. A corresponding downlink block then also has an uplink counter block identifier (USF) which can acquire only a limited 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 identifier (USF) unallocated to any mobile station. In addition, the network either (1) uses the identifier 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 mobile station cannot use for transmission without a separate authorisation.

DETAILED DESCRIPTION OF THE INVENTION According to a first embodiment of the invention, a network leaves (at least) one USF identifier unallocated to any mobile station and uses said USF identifier according to alternative 2 in downlink blocks corresponding to reserved blocks.
According to a second embodiment of the invention, at least one USF identifier value is separately determined, said value denoting a reserved uplink block.
Without a separate authorization, a mobile station is not allowed to use the reserved block for transmission.
A suitable mechanism for sending such a separate authorization is disclosed in a copending Finnish patent application `Allocation of control channel in packet radio network` filed by the same applicant on the same date as the present application.
According to said copending patent application, allocation of an uplink resource is not dependent of a possible USF identifier.
Instead, the mobile station sends an uplink transmission after a predetermined time from a downlink block in which said polling field is in a polling state.
When the mobile station sends an uplink transmission, the USF identifier in the corresponding downlink block should be one that is not allocated to any mobile station, so as to avoid collision in the transmissions of the mobile stations.
The uplink resource is not, as in the standard proposal, allocated by using a USF identifier.
Instead, the mobile station sends an uplink transmission after a predetermined time from the block in which the downlink P bit is set.
The predetermined time is most advantageously a fixed period of time.
This can be easily implemented in such a way that after the active P bit, the mobile station waits for a fixed number of blocks before the uplink transmission.
The most suitable number of USF identifiers that the network does not allocate to any mobile station is exactly one.
This maximises the number of USF identifiers that can be used in a manner according to the standard proposal.
It is apparent to a person skilled in the art that as technology advances, the basic idea of the invention can be implemented in various different ways


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