Group based PDCCH capability for LTE
First Claim
1. A mobile terminal comprising a processor and a receiver configured to receive data from a wireless communications system via a wireless access interface, the mobile terminal belonging to a predetermined group of mobile terminals, the wireless access interface providing a plurality of communications resource elements across a first frequency range, whereinthe wireless access interface includes a plurality of time divided sub-frames, and at least one of the sub-frames includes:
- a first control region in a first part of the sub-frame for communicating first signaling information to one or more of the mobile terminals, the first control region including a plurality of control channel resource elements, a first subset of said control channel resource elements providing a group control channel, the group control channel being associated with a group identifier and at least partially encoded using the group identifier; and
a second control region in a second part of the sub-frame, distinct from the first part of the sub-frame, the second control region being for communicating second signaling information to the predetermined group of the mobile terminals, andthe group control channel contains information indicative of the location of the second control region, said information being accessible by applying the group identifier to the group control channel,membership of the predetermined group is indicated by the use of the group identifier,the processor operates to locate the group control channel within the first control region using the group identifier; and
the group identifier is deduced from a relationship between a first preamble signature indicated in a random access preamble message received by a base station from a terminal and a second preamble signature indicated in a random access response message transmitted by the base station to the terminal in reply to the random access preamble message.
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Accused Products
Abstract
A group-based PDCCH capability in LTE. Information common to a group of UEs, such as those common to a virtual carrier, may be signalled in a group search space within the PDCCH. This common information may include the location of a further control region embedded in the virtual carrier which contains UE-specific information for access the resources of the virtual carrier. Additional methods assign UEs a group identity by implicit signalling, and determine the aggregation level of the group-based PDCCH search space.
32 Citations
14 Claims
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1. A mobile terminal comprising a processor and a receiver configured to receive data from a wireless communications system via a wireless access interface, the mobile terminal belonging to a predetermined group of mobile terminals, the wireless access interface providing a plurality of communications resource elements across a first frequency range, wherein
the wireless access interface includes a plurality of time divided sub-frames, and at least one of the sub-frames includes: -
a first control region in a first part of the sub-frame for communicating first signaling information to one or more of the mobile terminals, the first control region including a plurality of control channel resource elements, a first subset of said control channel resource elements providing a group control channel, the group control channel being associated with a group identifier and at least partially encoded using the group identifier; and a second control region in a second part of the sub-frame, distinct from the first part of the sub-frame, the second control region being for communicating second signaling information to the predetermined group of the mobile terminals, and the group control channel contains information indicative of the location of the second control region, said information being accessible by applying the group identifier to the group control channel, membership of the predetermined group is indicated by the use of the group identifier, the processor operates to locate the group control channel within the first control region using the group identifier; and the group identifier is deduced from a relationship between a first preamble signature indicated in a random access preamble message received by a base station from a terminal and a second preamble signature indicated in a random access response message transmitted by the base station to the terminal in reply to the random access preamble message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method performed by a mobile terminal comprising a processor and a receiver configured to receive data from a wireless communications system via a wireless access interface, the mobile terminal belonging to a predetermined group of mobile terminals, the wireless access interface providing a plurality of communications resource elements across a first frequency range, the method comprising:
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receiving, by the receiver via the wireless access interface, a plurality of time divided sub-frames, at least one of the sub-frames including; a first control region in a first part of the sub-frame for communicating first signaling information to one or more of the mobile terminals, the first control region including a plurality of control channel resource elements, a first subset of said control channel resource elements providing a group control channel, the group control channel being associated with a group identifier and at least partially encoded using the group identifier; and a second control region in a second part of the sub-frame, distinct from the first part of the sub-frame, the second control region being for communicating second signaling information to the predetermined group of the mobile terminals, wherein the group control channel contains information indicative of the location of the second control region, said information being accessible by applying the group identifier to the group control channel, and membership of the predetermined group is indicated by the use of the group identifier; and locating the group control channel within the first control region using the group identifier, wherein the group identifier is deduced from a relationship between a first preamble signature indicated in a random access preamble message received by a base station from a terminal and a second preamble signature indicated in a random access response message transmitted by the base station to the terminal in reply to the random access preamble message.
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Specification