Random access control method and system
First Claim
1. A method, comprising:
- receiving a dynamically adjustable parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network by at least one mobile station of a plurality of mobile stations of the mobile communications network, wherein said parameter defines the total number of allowed access slots that make up each frame of the physically existing random access channel;
determining, at said at least one mobile station, said allowed access slots of the physically existing random access channel based on said parameter;
using, at said at least one mobile station, at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station; and
receiving said parameter via a broadcast channel, wherein said broadcast channel is a broadcast channel of a wideband code division multiple access system.
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Accused Products
Abstract
The present invention relates to a method and system for performing a random access operation between a mobile station and a network element such as a base transceiver station (10), wherein allowed access slots for random access channels are defined by the network and are signaled to the mobile station (20). The definition of the allowed access slots is performed on the basis of a parameter set by the base transceiver station (10) and transmitted to the mobile station (20) which determines the allowed access slots based on the parameter. Thus, the number of allowed access slots can be defined by the network and can be changed dynamically based on the random access messaging load and the hardware requirements.
35 Citations
48 Claims
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1. A method, comprising:
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receiving a dynamically adjustable parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network by at least one mobile station of a plurality of mobile stations of the mobile communications network, wherein said parameter defines the total number of allowed access slots that make up each frame of the physically existing random access channel; determining, at said at least one mobile station, said allowed access slots of the physically existing random access channel based on said parameter; using, at said at least one mobile station, at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station; and receiving said parameter via a broadcast channel, wherein said broadcast channel is a broadcast channel of a wideband code division multiple access system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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receiving a dynamically adjustable parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network by at least one mobile station of a plurality of mobile stations of the mobile communications network, wherein said parameter defines the total number of allowed access slots that make up each frame of the physically existing random access channel; determining, at said at least one mobile station, said allowed access slots of the physically existing random access channel based on said parameter; using, at said at least one mobile station, at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station; receiving said parameter via a broadcast channel; and initiating said random access operation via a physical random access channel uplink channel and an acquisition indication channel downlink channel of the wideband code division multiple access system. - View Dependent Claims (12, 13)
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14. A method, comprising:
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receiving a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network by at least one mobile station of a plurality of mobile stations of the mobile communications network; determining, at said at least one mobile station, said allowed access slots of the physically existing random access channel based on said parameter; using, at said at least one mobile station, at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, wherein said parameter defines a subset of available access slots of said mobile communications network; determining said subset by another parameter transmitted from said base transceiver station to said mobile station; changing a bit number of said parameter in dependence on said other parameter; and disabling a transmission of a preamble signature or an acquisition indication in dependence on a value of said parameter. - View Dependent Claims (15)
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16. A method, comprising:
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receiving a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network by at least one mobile station of a plurality of mobile stations of the mobile communications network; determining, at said at least one mobile station, said allowed access slots of the physically existing random access channel based on said parameter; using, at said at least one mobile station, at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, wherein said parameter defines a subset of available access slots of said mobile communications network; determining said subset by another parameter transmitted from said base transceiver station to said mobile station; changing a bit number of said parameter in dependence on said other parameter; and calculating an index of an allowed uplink access slot on the basis of a value of said parameter and a frame number of a frame used for transmitting an uplink access slot.
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17. A method, comprising:
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receiving a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network by at least one mobile station of a plurality of mobile stations of the mobile communications network; determining, at said at least one mobile station, said allowed access slots of the physically existing random access channel based on said parameter; and using, at said at least one mobile station, at least one of said determined allowed access slots of the physically existing random access channel to perform a random access operation with said base transceiver station, wherein said parameter defines a subset of available access slots of said mobile communications network, wherein said subset is determined by another parameter transmitted from said base transceiver station to said at least one mobile station, wherein a bit number of said parameter is changed in dependence on said other parameter, wherein an index of an allowed uplink access slot is calculated on the basis of the value of said parameter and a frame number of a frame used for transmitting an uplink access slot, wherein said index is calculated by using the equation
i=3·
N+(F modulo
3)where 0≦
N≦
2,wherein F and N are integers, and F denotes said frame number, and wherein only access slots having indices within the range 0 to 7 are valid. - View Dependent Claims (18)
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19. A method, comprising:
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receiving a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network by at least one mobile station of a plurality of mobile stations of the mobile communications network; determining, at said at least one mobile station, said allowed access slots of the physically existing random access channel based on said parameter; and using, at said at least one mobile station, at least one of said determined allowed access slots of the physically existing random access channel to perform a random access operation with said base transceiver station wherein said parameter defines a subset of available access slots of said mobile communications network, wherein said subset is determined by another parameter transmitted from said base transceiver station to said mobile station, wherein a bit number of said parameter is changed in dependence on said other parameter, wherein an index of an allowed uplink access slot is calculated on the basis of the value of said parameter and a frame number of a frame used for transmitting an uplink access slot, wherein said index is calculated by using the equation
i=4·
N+(Γ
modulo
4)where 0≦
N≦
3,wherein Γ and
N are integers, and 64 denotes a frame number indicating two consecutive frame numbers of said frame used to transmit an uplink access slot, andwherein only access slots having indices within the range 0 to 14 are valid.
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20. A method, comprising:
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receiving a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network by at least one mobile station of a plurality of mobile stations of the mobile communications network; determining, at said at least one mobile station, said allowed access slots of the physically existing random access channel based on said parameter; and using, at said at least one mobile station, at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, wherein bit values of a binary expression of said parameter determine a combination of calculated indices obtained for other values of said parameter, said other values corresponding to binary weights of said binary expression.
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21. A system, comprising:
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a base transceiver station configured to transmit a dynamically adjustable parameter defining allowed access slots of a physically existing random access channel, wherein said parameter defines the total number of allowed access slots that make up each frame of the physically existing random access channel; and a plurality of mobile stations configured to receive said parameter to determine said allowed access slots of the physically existing random access channel based on said parameter, and to use at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, wherein said base transceiver station is a wideband code division multiple access base transceiver station and said plurality of mobile stations are wideband code division multiple access mobile stations. - View Dependent Claims (22, 23)
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24. An apparatus, comprising:
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setting means for setting a dynamically adjustable parameter defining allowed access slots of a physically existing random access channel, wherein said parameter defines the total number of allowed access slots that make up each frame of the physically existing random access channel, and wherein at least one mobile station initiates a random access operation to the apparatus based on the allowed access slots of the physically existing random access channel; and transmitting means for transmitting said parameter to said plurality of mobile stations, wherein said apparatus is a wideband code division multiple access base transceiver station. - View Dependent Claims (25, 26, 27, 28)
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29. An apparatus, comprising:
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a receiver configured to receive from a network element a dynamically adjustable parameter defining allowed access slots of a physically existing random access channel for a random access operation, wherein said parameter defines the total number of allowed access slots that make up each frame of the physically existing random access channel; a processor configured to determine said allowed access slots of the physically existing random access channel based on said parameter received from said network element; and a transmitter configured to initiate transmission of a random access message to said network element using at least one of said determined allowed access slots of the physically existing random access channel, wherein the processor is further configured to randomly select an uplink access slot to be used for transmitting a preamble of said random access message from the allowed access slots of the physically existing random access channel determined by said processor, and wherein consecutive preambles are transmitted a predetermined number of access slots apart. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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38. An apparatus, comprising:
a processor configured to receive a dynamically adjustable parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network, wherein said parameter defines the total number of allowed access slots that make up each frame of the physically existing random access channel, determine said allowed access slots of the physically existing random access channel based on said parameter, use at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, and receive said parameter via a broadcast channel, wherein said broadcast channel is a broadcast channel of a wideband code division multiple access system. - View Dependent Claims (39, 40)
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41. An apparatus, comprising:
a processor configured to receive a dynamically adjustable parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network, wherein said parameter defines the total number of allowed access slots that make up each frame of the physically existing random access channel, determine said allowed access slots of the physically existing random access channel based on said parameter, use at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, receive said parameter via a broadcast channel, and initiate said random access operation via a physical random access channel uplink channel and an acquisition indication channel downlink channel of the wideband code division multiple access system. - View Dependent Claims (42, 43)
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44. An apparatus, comprising:
a processor configured to receive a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network, determine said allowed access slots of the physically existing random access channel based on said parameter, use at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, wherein said parameter defines a subset of available access slots of said mobile communications network, determine said subset by another parameter transmitted from said base transceiver station, change a bit number of said parameter in dependence on said other parameter, and disable a transmission of a preamble signature or an acquisition indication in dependence on a value of said parameter.
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45. An apparatus, comprising:
a processor configured to receive a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network, determine said allowed access slots of the physically existing random access channel based on said parameter, use at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, wherein said parameter defines a subset of available access slots of said mobile communications network, determine said subset by another parameter transmitted from said base transceiver station, change a bit number of said parameter in dependence on said other parameter, and calculate an index of an allowed uplink access slot on the basis of a value of said parameter and a frame number of a frame used for transmitting an uplink access slot.
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46. An apparatus, comprising:
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a processor configured to receive a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network;
determine said allowed access slots of the physically existing random access channel based on said parameter, and use at least one of said determined allowed access slots of the physically existing random access channel to perform a random access operation with said base transceiver station, wherein said parameter defines a subset of available access slots of said mobile communications network, wherein said subset is determined by another parameter transmitted from said base transceiver station, wherein a bit number of said parameter is changed in dependence on said other parameter, wherein an index of an allowed uplink access slot is calculated on the basis of the value of said parameter and a frame number of a frame used for transmitting an uplink access slot,wherein said index is calculated by using the equation
i=3·
N+(F modulo
3)where 0≦
N≦
2,wherein F and N are integers, and F denotes said frame number, and wherein only access slots having indices within the range 0 to 7 are valid.
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47. An apparatus, comprising:
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a processor configured to receive a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network, determine said allowed access slots of the physically existing random access channel based on said parameter, and use at least one of said determined allowed access slots of the physically existing random access channel to perform a random access operation with said base transceiver station, wherein said parameter defines a subset of available access slots of said mobile communications network, wherein said subset is determined by another parameter transmitted from said base transceiver station, wherein a bit number of said parameter is changed in dependence on said other parameter, wherein an index of an allowed uplink access slot is calculated on the basis of the value of said parameter and a frame number of a frame used for transmitting an uplink access slot, wherein said index is calculated by using the equation
i=4·
N+(Γ
modulo
4)where 0≦
N≦
3,wherein Γ and
N are integers, and Γ
denotes a frame number indicating two consecutive frame numbers of said frame used to transmit an uplink access slot, and wherein only access slots having indices within the range 0 to 14 are valid.
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48. An apparatus, comprising:
a processor configured to receive a parameter defining allowed access slots of a physically existing random access channel from a base transceiver station of a mobile communications network, determine said allowed access slots of the physically existing random access channel based on said parameter, and use at least one of said determined allowed access slots of the physically existing random access channel to initiate a random access operation with said base transceiver station, wherein bit values of a binary expression of said parameter determine a combination of calculated indices obtained for other values of said parameter, said other values corresponding to binary weights of said binary expression.
Specification