Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2001-03-21
2004-08-31
Trost, William (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S452100, C455S452200, C455S453000, C370S447000
Reexamination Certificate
active
06785548
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a radio communication system having a random access channel for transmissions from a secondary station to a primary station, and further relates to primary and secondary stations for use in such a system and to a method of operating such a system. While the present specification describes a system with particular reference to the emerging Universal Mobile Telecommunication System (UMTS), it is to be understood that the techniques described are equally applicable to use in other mobile radio systems. In this specification the term random access packet channel refers to the logical channel on which random access packet transmissions take place, which would typically consist of a number of distinct physical channels.
A random access channel is a normal component of a radio communication system, enabling a Mobile Station (MS) to send short messages to a Base Station (BS). Applications include signalling to the BS when the MS is turned on, sending a packet of data to the BS when the MS may not be engaged in a call, and requesting the BS to allocate a resource for the MS to use.
In a system where mobile stations often have a requirement to send packets of data to the BS when not actually engaged in a call it is advantageous to provide a random access packet channel with similar characteristics to a standard random access channel but intended for the transmission of small and medium sized packets from a MS to the BS.
In an embodiment of a such a scheme developed for UMTS, there are a number of random access packet channels available to a MS. A request for access to a packet channel resource sent by the MS is encoded with one of 16 available signatures. Each signature corresponds to a request for a particular resource required by the MS, for example a channel having a particular bit rate. If a suitable resource is available for use, the BS allocates it to the requesting MS.
A problem with such a scheme is the limited amount of information that can be transferred during the access procedure, because of the limited number of signatures and channels available. This problem reduces the efficiency of resource allocation in the system.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a random access packet channel having improved resource allocation.
According to a first aspect of the present invention there is provided a radio communication system having a random access channel for transmissions from a secondary station to a primary station, the secondary station having means for requesting allocation of a random access channel resource by transmission of an access preamble encoded with a first signature selected from a first set of signatures and the primary station having means for receiving the access preamble, for determining the first signature and for transmitting an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available, wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set.
According to a second aspect of the present invention there is provided a primary station for use in a radio communication system having a random access channel for transmissions from a secondary station to the primary station, wherein means are provided for receiving an access preamble transmitted by the secondary station, which preamble is encoded with a first signature selected from a first set of signatures, for determining the first signature, for determining from the access preamble which random access channel resource the secondary station requests to be allocated and for transmitting an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available, wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set.
According to a third aspect of the present invention there is provided a secondary station for use in a radio communication system having a random access channel for transmissions to a primary station, wherein means are provided for requesting allocation of a random access channel resource by transmission of an access preamble encoded with a first signature selected from a first set of signatures and for receiving an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available, wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set.
According to a fourth aspect of the present invention there is provided a method of operating a radio communication system having a random access channel for transmissions from a secondary station to a primary station, the method comprising the secondary station requesting allocation of a random access channel resource by transmission of an access preamble encoded with a first signature selected from a first set of signatures and the primary station receiving the access preamble, determining the first signature and transmitting an access acknowledgement encoded with a second signature selected from a second set of signatures indicating whether the requested resource is available, wherein the choice of first signature provides further information regarding the resource allocation request and wherein each signature of the second set corresponds to a plurality of signatures in the first set.
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XP 002027584. Qing Guo and Djamal Zeghlache, PD Sep. 18, 1994, “Aggressive Packet Reservation Multiple Access Using Signatures”, IEEE Int'l Symposium on Personal Inddor and Mobile Radio Communications, pp. 1247-1253.*
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Hunt Bernard
Moulsley Timothy J.
Koninklijke Philips Electronics , N.V.
Slobod Jack D.
Trost William
Zewdu Meless
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