Methods and apparatus for performing slot hopping of logical control channels in wireless communications systems
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsBengt Persson, Christofer Lindheimer
Life of this patent
Estimating the term…
Abstract
A base station synchronized Time Division Multiple Access (TDMA) System with a discontinuous control channel carrier is disclosed. Control channels are planned in a time reuse, overlaying the ordinary frequency reuse. Different base stations are allocated different timeslots for control channel transmissions. The control channels are allocated timeslots in a slot hopping fashion, such that transmissions from different base stations are detected by only monitoring one timeslot. Thus, MAHO measurements are possible on all neighbors, and no traffic allocation will continuously coincide with control channel transmissions from certain base stations.
Claims29
In a radio communications system employing time reuse for transmission of at least one logical channel, a method of transmitting broadcast and common control information from a base station in a first time group to mobile stations in the system, said method comprising the steps of:
- transmitting the broadcast and common control information in a first allocated timeslot in a first frame;
- transmitting the broadcast and common control information in a second allocated timeslot in a second frame, said second allocated timeslot having a different position in the second frame than the position of the first allocated timeslot in the first frame;
- and
- transmitting in each frame, a synchronization burst indicating to the mobile stations in the system, which timeslot in that frame includes the broadcast and common control information.
In a radio communications system employing time reuse on broadcast and common control channels, wherein different base stations transmit broadcast and common control transmissions in different timeslots, a method of enabling a mobile station in the system to make measurements, in a single timeslot, of the broadcast and common control channel transmissions from at least two base stations in the system, comprising the steps of:
- transmitting a downlink broadcast or common control channel, from a first base station, during a first portion of a first timeslot, and during a subsequent portion of a second timeslot;
- transmitting a downlink broadcast or common control channel, from a second base station, during a first portion of the second timeslot and during a subsequent portion of a third timeslot;
- measuring the transmissions from the second base station, at the mobile station, during at least a part of the first portion of the second timeslot;
- and
- measuring the transmissions from the first base station, at the mobile station, during at least a part of the subsequent portion of the second timeslot.
A base station in a radio communications system employing time reuse for transmission of broadcast and common control information to mobile stations in the system, said base station comprising:
- a controller that designates a sequence of timeslots in a sequence of associated frames, each designated timeslot in the sequence indicating the timeslot in each associated frame in which broadcast and common control information is to be transmitted to the mobile stations in the system, wherein the designated timeslot in each frame is different than the designated timeslot in the immediately receding frame;
- means for transmitting the broadcast and common control information in the designated timeslot in each frame;
- and
- means for transmitting in each frame, a synchronization burst indicating to the mobile stations in the system, which timeslot in that frame includes the broadcast and common control information.
A radio communications system employing time reuse on broadcast and common control channels, comprising:
- a first base station transmitting a downlink broadcast or common control channel during a first portion of a first timeslot and during a subsequent portion of a second timeslot;
- a second base station transmitting a downlink broadcast or common control channel during a first portion of the second timeslot and during a subsequent portion of a third timeslot;
- and
- a mobile station measuring the transmissions from the second base station during at least a part of the first portion of the second timeslot and measuring the transmissions from the first base station during at least a part of the subsequent portion of the second timeslot.
In a radio communications system employing time reuse for transmission of at least one logical channel, a method of transmitting common control information from a mobile station to a base station in a first time group in the system, said method comprising the steps of:
- receiving by the mobile station, a synchronization burst transmitted by the base station, said synchronization burst indicating to the mobile station, which timeslot in each frame is designated to include the common control information;
- transmitting by the mobile station, the common control information in a first timeslot in a first frame, said first timeslot being the timeslot in the first frame designated to include the common control information;
- and
- transmitting the common control information in a second timeslot in a second frame, said second timeslot being the timeslot in the second frame designated to include the common control information, and said second designated timeslot having a different position in the second frame than the position of the first designated timeslot in the first frame.
Dependencies are inferred from the claim text.