Scrambling initialisation in a communications system
AssigneeNEC Corporation
InventorsRobert ARNOTT, Yassin Aden AWAD, Caroline LIANG
Life of this patent
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Abstract
Scrambling code is initialized based on a parameter, n′RNTl, that changes from a given block of sub-frames to a subsequent block of sub-frames wherein the parameter is derived using one of the following formulas: n′RNTl=(nRNTI+SFN)mod 216 n′RNTl=(nRNTI+k)mod 216 where nRNTI is a temporary identifier associated with a mobile device connected to said cell and for which said scrambling code is applicable; and SFN is a system frame number associated with said at least one of said sequence of sub-frames; and k is a sub-frame counter.
Claims15
Communication apparatus for a cellular communication system comprising a plurality of cells, the communication apparatus comprising:
- means for communicating signals in a cell in a sequence of sub-frames;
- and
- means for scrambling said signals communicated in said cell using a scrambling sequence that is applied per sub-frame for a Physical Downlink Shared Channel (PDSCH) for a given block of sub-frames;
- wherein said scrambling sequence is initialized based on a parameter that changes from one block of sub-frames to a next block of sub-frames and a sub-frame number.
A method performed by communication apparatus configured to communicate signals, in a sequence of sub-frames, in a cell of cellular communication system comprising a plurality of cells, the method comprising:
- initializing a scrambling sequence based on a parameter that changes from one block of sub-frames to a next block of sub-frames and a sub-frame number, and
- scrambling signals communicated in said cell using a scrambling sequence that is applied per sub-frame for a Physical Downlink Shared Channel (PDSCH) for a given block of sub-frames.
A computer program product comprising instructions for causing a computer-programmable device of a communication apparatus configured to communicate signals, in a sequence of sub-frames, in a cell of cellular communication system comprising a plurality of cells, to perform a method comprising:
- initializing a scrambling sequence based on a parameter that changes from one block of sub-frames to a next block of sub-frames and a sub-frame number, and
- scrambling signals communicated in said cell using a scrambling sequence that is applied per sub-frame for a Physical Downlink Shared Channel (PDSCH) for a given block of sub-frames.
Dependencies are inferred from the claim text.