# US 2014/0192770 A1 · Methods and Nodes in a Wireless Communication System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192770 A1 - Document ID: US20140192770A1 - Status: Published application - Kind: A1 - Application number: 14/206,733 - Filed: 2014-03-12 - Published: 2014-07-10 - Earliest claimed: 2012-09-28 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Pablo Soldati; Branislav Popovic; Weijun Sun - Web page: https://patentgrep.com/patent/US20140192770A1 ## CPC - H04L 5/0037: {Inter-user or inter-terminal allocation} - H04L 5/0016: {Time-frequency-code} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/0038: {Blind format detection (for detection of modulation format H04L27/0012)} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods and nodes, for communication of a receiver-specific control channel signal within a wireless communication system, to be received by a receiver, wherein receiver-specific downlink control channel signals are scheduled for transmission over sets of Physical Resource Block pairs. ## Claims ### Claim 1 A method in a radio network node, for communication of a receiver-specific control channel signal within a wireless communication system, to be received by a receiver, wherein receiver-specific downlink control channel signals are scheduled for transmission over sets of Physical Resource Block (PRB) pairs, the method comprising: configuring at least one receiver-specific set of at least one PRB pair of time-frequency Resource Elements (REs); configuring a set of modulation signature sequences; configuring an alphabet of at least one symbol, wherein each of the at least one symbol in the alphabet is associated with a modulation signature sequence in the configured set of modulation signature sequences; selecting, for each configured receiver-specific set of at least one PRB pair, at least one modulation signature sequence by selecting a receiver-specific codeword comprising a number of symbols from the configured alphabet; transmitting at least one of the configured set of modulation signature sequences and the configured alphabet of symbols; selecting at least one set of at least one PRB pair for the transmission of a receiver-specific control channel signal; modulating the selected at least one receiver-specific set by applying the selected at least one modulation signature sequence; and transmitting the receiver-specific control channel signal over the at least one modulated receiver-specific set of the at least one PRB pair. ### Claim 2 (depends on 1) The method according to claim 1, wherein the action of selecting the at least one modulation signature sequence is performed by selecting a receiver-specific codeword of symbols from an alphabet of at least one symbol. ### Claim 3 (depends on 2) The method according to claim 2, wherein each symbol of said alphabet is associated with a different modulation signature sequence, and a unique index mapping associates the position of each symbol in said codeword to an individual PRB pair within said configured receiver-specific set. ### Claim 4 (depends on 1) The method according to claim 1, further comprising configuring a number of antenna ports on each at least one PRB pair of the configured receiver-specific set, wherein a unique index mapping is associated with the position of a symbol in the codeword to an antenna port of said configured number of antenna ports on an individual PRB pair within said configured receiver-specific set. ### Claim 5 (depends on 1) The method according to claim 1, wherein the action of transmitting further comprises transmitting the selected receiver-specific codeword. ### Claim 6 (depends on 5) The method according to claim 5, wherein the transmission of the receiver-specific codeword is made over radio resource control (RRC) signalling. ### Claim 7 (depends on 1) The method according to claim 1, wherein a two symbol alphabet and two signature sequences are used. ### Claim 8 (depends on 1) The method according to claim 1, wherein a single receiver-specific modulation signature sequence is selected for all sets of Physical Resource Block, PRB, pairs, and no codeword has to be explicitly signalled to the receiver. ### Claim 9 (depends on 1) The method according to claim 1, wherein the radio network node comprises an enhanced NodeB in a Long Term Evolution (LTE) system, the receiver comprises a User Equipment (UE), the downlink control channel comprises an Enhanced Physical Downlink Control Channel (EPDCCH), the downlink data channel comprises a Physical Downlink Shared Channel (PDSCH), the receiver-specific set of downlink control channel resources corresponds to an EPDCCH set which comprises Enhanced Control Channel Elements (ECCEs) and/or Enhanced Resource Element Groups (EREGs). ### Claim 10 A radio network node for communication of a receiver-specific control channel signal within a wireless communication system to be received by a receiver, wherein receiver-specific downlink control channel signals are scheduled for transmission over sets of Physical Resource Block (PRB) pairs, the radio network node comprising: a processing circuit adapted to configure at least one receiver-specific set of at least one PRB pair of time-frequency Resource Elements (REs), configure a set of modulation signature sequences, configure an alphabet of at least one symbol, wherein each symbol in the alphabet is associated with a modulation signature sequence in the configured set of modulation signature sequences, select, for each configured receiver-specific set of at least one PRB pair, at least one modulation signature sequence by selecting a receiver-specific codeword comprising a number of symbols from the configured alphabet, select at least one set of at least one PRB pair for the transmission of a receiver-specific control channel signal, and modulate the configured receiver-specific set by applying the configured set of modulation signature sequences; and a transmitting unit adapted to transmit at least one of the selected receiver-specific codeword, the configured set of modulation signature sequences, and the configured alphabet of symbols, and transmit the receiver-specific control channel signal over the modulated receiver-specific set of the at least one PRB pair. ### Claim 11 (depends on 10) The radio network node according to claim 10, wherein the processing circuit is adapted to select the at least one modulation signature sequences by selecting a receiver-specific codeword of symbols from an alphabet of a plurality of symbols. ### Claim 12 (depends on 11) The radio network node according to claim 11, wherein each symbol of said alphabet is associated with a different modulation signature sequence, and a unique index mapping associates the position of each symbol in said codeword to an individual PRB pair within said configured receiver-specific set. ### Claim 13 A method in a receiver, for detecting a set of Physical Resource Block (PRB) pairs used for the communication of a receiver-specific control channel signal comprising: receiving a receiver-specific control channel signal over a modulated receiver-specific set of at least one PRB pair; identifying the selected set of PRBs pairs allocated by the radio network node for control channel signalling by searching within the at least one received receiver-specific set of at least one PRB pair for signature sequences; demodulating control channel signal in the identified set; and demodulating data received from the radio network node on a physical downlink data channel signal by using information obtained from the demodulated control channel signal. ### Claim 14 (depends on 13) The method according to claim 13, further comprising receiving at least one of the receiver-specific codeword, the set of modulation signature sequences, and the configured alphabet of symbols from the radio network node. ### Claim 15 A receiver for detecting a set of Physical Resource Block (PRB) pairs used for the communication of a receiver-specific control channel signal comprising: a receiving unit adapted for receiving a receiver-specific control channel signal over a modulated receiver-specific set of at least one PRB pair; and a processing circuit adapted for identifying the selected set of PRBs pairs allocated by the radio network node for control channel signalling by searching within the at least one received receiver-specific set of at least one PRB pair; and further adapted for demodulating the identified control channel signal; and furthermore adapted for demodulating data received from the radio network node on a physical downlink data channel signal, by using information obtained from the demodulated control channel signal. ### Claim 16 (depends on 15) The receiver according to claim 15, wherein the receiving unit is further adapted for receiving at least one of the receiver-specific codeword, the set of modulation signature sequences, and the configured alphabet of symbols from the radio network node. ### Claim 17 (depends on 16) The receiver according to claim 16, wherein the receiving unit is further adapted for receiving the receiver-specific codeword from the radio network node over Radio Resource Control (RRC) signalling.