Communication system
a communication system and communication technology, applied in the field of mobile communications devices and networks, can solve the problems of backward compatibility with legacy devices, increase in control channel (pdcch) capacity, and limiting system performance,
Active Publication Date: 2013-06-20
NEC CORP
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AI Technical Summary
Benefits of technology
The invention provides a mobile communication system and apparatus that can communicate with multiple mobile devices in a cellular network. The system uses sub-frames with different reference signals to communicate control information to each device. This allows for more efficient communication and better resource allocation. The system can also use multiple antennas to communicate the control information and can adapt to the location of the devices. Overall, the invention improves communication speed and reliability in a cellular network.
Problems solved by technology
Further, the need for interference management between different cells operating on component carriers of the same frequency in co-incident or overlapping geographic areas has led to the development of extension carriers (which are not backwards compatible with legacy devices).
However, in communication systems in which extension carriers are employed, the cross-carrier scheduling from the stand-alone (legacy) component carrier can cause an increase in control channel (PDCCH) blocking and control channel (PDCCH) capacity can become a limiting factor of system performance.
Method used
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Experimental program
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Overview
[0083]FIG. 1 schematically illustrates a mobile (cellular) telecommunication system 1 in which a user of any of a plurality of mobile communication devices 3-1 to 3-7 can communicate with other users via one or more of a plurality of base stations 5-1, 5-2 and 5-3. In the system illustrated in FIG. 1, each base station 5 shown is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) base station capable of operating in a multi-carrier environment.
[0084]In FIG. 1, the base station labelled 5-1 comprises a so called ‘macro’ base station operating a plurality of relatively geographically large ‘macro’ cells 7, 8 using respective component carriers (CCs) C1, C2, of a component carrier set. In this embodiment, the macro base station 5-1 operates component carrier C1 as a primary component carrier on which a primary cell (PCell) 7 is provided, and component carrier C2 as a secondary component carrier on which a secondary cell (SCell) 8 is provided. The PCell 7 has a larg...
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A communication system is presented in which a base station is provided for communicating with a plurality of mobile communication devices in a cellular communication system. The base station operates one of more communication cells and communicates subframes, with each of the plurality of communication devices within the cell(s), each comprising the communication resources of a control region for communicating a control channel and the communication resources of a data region for communicating a respective data channel. The base station communicates a control channel having a first DMRS sequence in a control region of some subframes and a control channel having a second DMRS sequence in a control region of other subframes. The second control channel may be transmitted in a radio beam focussed spatially in a direction of a communication device. The first control channel may be transmitted omnidirectionally throughout the cell(s).
Description
TECHNICAL FIELD[0001]The present invention relates to mobile communications devices and networks, particularly but not exclusively those operating according to the 3rd Generation Partnership Project (3GPP) standards or equivalents or derivatives thereof. The invention has particular although not exclusive relevance to the Long Term Evolution (LTE) of UTRAN (called Evolved Universal Terrestrial Radio Access Network (E-UTRAN)).BACKGROUND ART[0002]It has been decided, as part of the 3GPP standardisation process, that downlink operation for system bandwidths beyond 20 MHz will be based on the aggregation of a plurality of component carriers at different frequencies. Such carrier aggregation can be used to support operation in a system both with and without a contiguous spectrum (for example, a non-contiguous system may comprise component carriers at 800 MHz, 2 GHz, and 3.5 GHz). Whilst a legacy mobile device may only be able to communicate using a single, backward compatible, component ...
Claims
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IPC IPC(8): H04W72/04
CPCH04W16/28H04W72/0406H04W72/046H04W72/23H04L5/0048H04L5/0023H04L1/0027H04W72/20H04W72/0453
Inventor AWAD, YASSIN ADENMARUTA, YASUSHISATO, TOSHIFUMI
Owner NEC CORP