# US 2017/0290010 A1 · Method and apparatus for determining control channel search space > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0290010 A1 - Document ID: US20170290010A1 - Status: Published application - Kind: A1 - Application number: 15/624,664 - Filed: 2017-06-15 - Published: 2017-10-05 - Earliest claimed: 2012-11-01 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Zhenfei Tang - Web page: https://patentgrep.com/patent/US20170290010A1 ## CPC - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 48/16: Discovering, processing access restriction or access information - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04W 48/12: using downlink control channel - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Embodiments of the present disclosure provide a method for determining a control channel search space. The method includes: determining numbers of at least two physical resource sets; determining, according to the numbers, location offsets of search spaces corresponding to the at least two physical resource sets, wherein the determined location offsets of the search spaces comprises at least two different location offsets of the search spaces; and determining, according to the location offsets of the search spaces corresponding to the at least two physical sets, the search spaces corresponding to the at least two physical resource sets. By grouping and numbering resources, and determining different location offsets for different search spaces, a probability of control channel search space conflict can be reduced. Thereby, resources of control channels can be maximized in a case of multiple users, and communication efficiency can be improved. ## Claims ### Claim 1 A method for determining a control channel search space at a communication device when at least two physical resource sets are configured for downlink control channel transmission, the method comprising: determining numbers of the at least two physical resource sets; determining, according to the numbers of the at least two physical resource sets, location offsets of search spaces corresponding to the at least two physical resource sets, wherein the determined location offsets of the search spaces comprises at least two different location offsets of the search spaces; and determining, according to the location offsets of the search spaces corresponding to the at least two physical sets, the search spaces corresponding to the at least two physical resource sets. ### Claim 2 (depends on 1) The method according to claim 1, wherein determining, according to the numbers of the at least two physical resource sets, the location offsets of search spaces corresponding to the at least two physical resource sets comprises: determining, according to the following formula, the location offsets of the search spaces corresponding to the at least two physical resource sets: Yk(c)=(A(c)·Yk−1(c))mod 65537 wherein c is a number of one of the at least two physical resource sets, Yk(c) is a location offset of a search space corresponding to one of the at least two physical resource sets whose number is c in the kth subframe, Y−1=nRNTI≠0, k=└nS/2∃, nRNTI is an identifier of a user equipment, and nS is a timeslot number, and wherein A(c) is variable based on c varying. ### Claim 3 (depends on 2) The method according to claim 2, wherein A(c) is any one of the following values: 39671, 39679, 39703, 39709, 39719, 39727, 39733, 39749, 39761, 39769, 39779, 39791, 39799, 39821, 39827, 39829, 39839, 39841, 39847,39857, 39863, 39869, 39877, 39883, 39887, 39901, 39929, 39937, 39953, 39971, 39979, 39983, and 39989. ### Claim 4 (depends on 2) The method according to claim 2, wherein: the at least two physical resource sets is two physical resource sets whose number c are 0 and 1; and when c=0, A(0)=39827, and when c=1, A(1)=39829. ### Claim 5 (depends on 2) The method according to claim 2, wherein A(c) is determined based on a cell identifier or the identifier of the user equipment. ### Claim 6 (depends on 1) The method according to claim 1, wherein determining, according to the numbers of the at least two physical resource sets, the location offsets of search spaces corresponding to the at least two physical resource sets comprises: determining, according to the following formula, the location offsets of the search spaces corresponding to the at least two physical resource sets: Yk(c)=(39827·Yk−1(c))mod D(c) wherein c is a number of one of the at least two physical resource sets, Yk(c) is a location offset of a search space corresponding to one of the at least two physical resource sets whose number is c in the kth subframe, Y−1=nRNTI≠0, k=└nS/2∃, nRNTI is an identifier of a user equipment, and nS is a timeslot number, and wherein D(c) is variable based on c varying. ### Claim 7 (depends on 6) The method according to claim 6, wherein D(c) is any one of the following values: 65269 65287, 65293, 65309, 65323, 65327, 65353, 65357, 65371, 65381, 65393, 65407, 65413, 65419, 65423, 65437, 65447, 65449, 65479, 65497, 65519, 65521, 65537, 65539, 65543, 65551, 65557, 65563, 65579, 65581, 65587, 65599, 65609, 65617, 65629, 65633, 65647, 65651, 65657, 65677, 65687, 65699, 65701, 65707, 65713, 65717, 65719, 65729, 65731, 65761. ### Claim 8 (depends on 6) The method according to claim 6, wherein: the at least two physical resource sets is two physical resource sets whose number c are 0 and 1; and when c=0, D(c)=65269, and when c=1, D(1)=65287. ### Claim 9 (depends on 6) The method according to claim 6, wherein D(c) is determined based on a cell identifier or the identifier of the user equipment. ### Claim 10 (depends on 1) The method according to claim 1, wherein the communication device is a processor, a base station or a user equipment. ### Claim 11 A communication device, comprising: a memory; and a processor coupled with the memory, wherein the processor is configured to: determine numbers of the at least two physical resource sets, determine, according to the numbers of the at least two physical resource sets, location offsets of search spaces corresponding to the at least two physical resource sets, wherein the determined location offsets of the search spaces comprises at least two different location offsets of the search spaces, and determine, according to the location offsets of the search spaces corresponding to the at least two physical sets, the search spaces corresponding to the at least two physical resource sets. ### Claim 12 (depends on 11) The device according to claim 11, wherein the processor is further configured to: determine, according to the following formula, the location offsets of the search spaces corresponding to the at least two physical resource sets: Yk(c)=(Ac·Yk−1(c))mod 65537 wherein c is a number of one of the at least two physical resource sets, Yk(c) is a location offset of a search space corresponding to one of the at least two physical resource sets whose number is c in the kth subframe, Y−1=nRNTI≠0, k=└nS/2∃, nRNTI is an identifier of a user equipment, and nS is a timeslot number, and wherein A(c) is variable based on c varying. ### Claim 13 (depends on 12) The device according to claim 12, wherein A(c) is any one of the following values: 39671, 39679, 39703, 39709, 39719, 39727, 39733, 39749, 39761, 39769, 39779, 39791, 39799, 39821, 39827, 39829, 39839, 39841, 39847,39857, 39863, 39869, 39877, 39883, 39887, 39901, 39929, 39937, 39953, 39971, 39979, 39983, and 39989. ### Claim 14 (depends on 12) The device according to claim 12, wherein the at least two physical resource sets is two physical resource sets whose number c are 0 and 1; and when c=0, A(0)=39827, and when c=1, A(1)=39829. ### Claim 15 (depends on 12) The device according to claim 12, wherein A(c) is determined based on a cell identifier or the identifier of the user equipment. ### Claim 16 (depends on 11) The method according to claim 11, wherein the processor is further configured to: determine, according to the following formula, the location offsets of the search spaces corresponding to the at least two physical resource sets: Yk(c)=(39827·Yk−1(c))mod D(c) wherein c is a number of one of the at least two physical resource sets, Yk(c) is a location offset of a search space corresponding to one of the at least two physical resource sets whose number is c in the kthsubframe, Y−1=nRNTI≠0, k=└nS/2∃, nRNTI is an identifier of a user equipment, and nS is a timeslot number, and wherein D(c) is variable based on c varying. ### Claim 17 (depends on 16) The device according to claim 16, wherein D(c) is any one of the following values: 65269 65287, 65293, 65309, 65323, 65327, 65353, 65357, 65371, 65381, 65393, 65407, 65413, 65419, 65423, 65437, 65447, 65449, 65479, 65497, 65519, 65521, 65537, 65539, 65543, 65551, 65557, 65563, 65579, 65581, 65587, 65599, 65609, 65617, 65629, 65633, 65647, 65651, 65657, 65677, 65687, 65699, 65701, 65707, 65713, 65717, 65719, 65729, 65731, 65761. ### Claim 18 (depends on 16) The device according to claim 16, wherein the at least two physical resource sets is two physical resource sets whose number c are 0 and 1; and when c=0, D(0)=6520), and when c=1, D(1)=65287. ### Claim 19 (depends on 16) The device according to claim 16, wherein D(c) is determined based on a cell identifier or the identifier of the user equipment. ### Claim 20 (depends on 11) The device according to claim 11, wherein the communication device is a processor, a base station or a user equipment.