Method of accessing resources of a radiocommunication system, mobile terminal and base station for the implementation of the method
AssigneeAlcatel Lucent
InventorsThierry Lucidarme, Nidham Ben Rached
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Abstract
The mobile terminal according to the invention comprises: means for receiving synchronization signals from a base station of a radiocommunication system; means for sending towards the base station requests for access to communication resources, at respective instants clamped with respect to instants of reception of said synchronization signals; means for determining a level of remoteness with respect to the base station; and means for advancing the instants of sending of the requests for access to communication resources, as a function of the level of remoteness determined by the means for determining a level of remoteness with respect to the base station.
Claims34
A method of accessing resources of a radiocommunication system comprising at least one base station, from a mobile terminal, the mobile terminal being arranged to sent access requests to the base station at respective send instants, the base station being arranged to detect access requests from the mobile terminal in reception windows, each reception window being provided for detection of access requests sent in a corresponding slot of send instants by a mobile terminal situated at a distance from the base station of less than a threshold, the reception window following the corresponding slot of send instants by a reference time interval, the method comprising the steps of:
- (a) determining a level of remoteness of the mobile terminal with respect to the base station;
- and
- (b) conditionally as a function of the level of remoteness determined between the mobile terminal and the base station, using a time interval greater than the reference interval, between the reception windows and the corresponding slots of instants of sending of the access requests by said mobile terminal, so that the base station can detect an access request sent by said mobile terminal, in a reception window following, by said time interval, the corresponding slot for the instant of sending of the access request,
- wherein the access requests are sent by the mobile terminal with a given reserved signature from among a set of possible reserved signatures, exclusively when the mobile terminal is considered to be remote from the base station by a distance greater than said threshold, and wherein the use of the time interval greater than the reference interval, between the reception windows and the corresponding slots of instants of sending the of the access requests by said mobile terminal, comprises a shift over time of the reception windows so as to detect the access requests sent with said given reserved signature, and in case the mobile terminal is considered to be within the threshold distance from the base station, then the access requests are sent with an unreserved signature and detected in an unshifted reception window.
A mobile terminal comprising:
- means for receiving synchronization signals from a base station of a radiocommunication system;
- means for sending towards the base station requests for access to communication resources, at respective instants clamped with respect to instants of reception of said synchronization signals, the access requests comprising a signature from among a set of possible reserved signatures;
- means for determining a level of remoteness with respect to the base station;
- and
- means for advancing the instants of sending the requests for access to communication resources, as a function of the level of remoteness determined by the means for determining a level of remoteness with respect to the base station;
- and
- means for choosing a signature from among the set of possible reserved signatures so as to send access requests comprising said reserved signature, as a function of the level of remoteness determined by the means for determining a level of remoteness with respect to the base station.
A base station for a radiocommunication system, comprising:
- means for sending synchronization signals to mobile terminals;
- and
- means for detecting requests for access to communication resources, sent by mobile terminals, in reception windows belonging to a set from among at least a first and a second set of reception windows, the access requests comprising a signature from among a set of possible signatures,
- wherein the reception windows of the first set are clamped with respect to respective instants of sending of the synchronization signals, and the reception windows of the second set are shifted over time with a delay with respect to the reception windows of the first set, and wherein the means fro detecting access request sent by mobile terminals comprise
- means for detecting access requests comprising at least one given reserved signature from among the set of possible reserved signatures n the reception windows of the second set, and means for detecting access requests comprising an unreserved signature other than said given reserved signature in the reception windows of the first set, wherein the reserved signatures are exclusively for mobile terminals considered to be remote from the base station by a distance greater than a predefined threshold.
Dependencies are inferred from the claim text.