# US 2013/0155997 A1 · Lte downlink control channel resource allocation method and base station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155997 A1 - Document ID: US20130155997A1 - Status: Published application - Kind: A1 - Application number: 13/819,986 - Filed: 2011-06-20 - Published: 2013-06-20 - Earliest claimed: 2010-09-10 - Assignees: Zte Corporation - Inventors: Wanjie Cai; Jianhong Xie - Web page: https://patentgrep.com/patent/US20130155997A1 ## CPC - H04W 72/04: Wireless resource allocation - H04W 72/54: based on quality criteria - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The disclosure relates to a LTE downlink control channel resource allocation method and base station. The method comprises that: a base station sends resource scheduling information to a physical layer via a MAC layer; the search space to which resources to be allocated belong is determined according to the scheduling information; when the resources to be allocated belong to dedicated search space of a UE, resources of the current downlink channel are allocated according to the quality level of the current downlink channel. The disclosure can dynamically and reasonably allocate PDCCH resources according to quality of the downlink channel, and can obtain the quality level of downlink channels through CQI fed back by the UE or BLER of HARQ or measurement result of the uplink channel, when quality of the downlink channel is unknown. ## Claims ### Claim 1 A Long Term Evolution (LTE) downlink control channel resource allocation method, comprising: sending, by a base station, resource scheduling information to a physical layer via a Media Access Control (MAC) layer; determining a search space to which resources to be allocated belong according to the resource scheduling information; and allocating the resources of a current downlink channel according to a quality level of the current downlink channel, when the resources to be allocated belong to a dedicated search space of a User Equipment (UE). ### Claim 2 (depends on 1) The method according to claim 1, wherein after determining the search space to which the resources to be allocated belong according to the scheduling information, the method further comprises: allocating the resources of the current downlink channel according to a default Control Channel Element (CCE) allocation value of a common search space, when the resources to be allocated belong to the common search space. ### Claim 3 (depends on 1) The method according to claim 1, wherein allocating the resources of the current downlink channel according to the quality level of the current downlink channel comprises: if the quality level of the current downlink channel is a first predetermined level, setting a current CCE allocation value of the current downlink channel in a manner of decreasing progressively in preset time to allocate the resources, based on a CCE allocation value to which the quality level of the current downlink channel corresponds, wherein the current CCE allocation value is greater than or equal to the minimum threshold; and if the quality level of the current downlink channel is a second predetermined level, setting the current CCE allocation value of the current downlink channel in a manner of increasing progressively in preset time to allocate the resources, based on a default CCE allocation value of the dedicated search space of the UE or the CCE allocation value to which the quality level of the current downlink channel corresponds, wherein the current CCE allocation value is less than or equal to the maximum threshold. ### Claim 4 (depends on 3) The method according to claim 3, wherein before allocating the resources of the current downlink channel according to the quality level of the current downlink channel, the method further comprises: obtaining the quality level of the current downlink channel according to a Channel Quality Indicator (CQI) index fed back by the UE. ### Claim 5 (depends on 3) The method according to claim 3, wherein before allocating the resources of the current downlink channel according to the quality level of the current downlink channel, the method further comprises: obtaining the quality level of the current downlink channel according to a Block Error Ratio (BLER) of Hybrid Automatic Repeat Request (HARQ) transmission. ### Claim 6 (depends on 3) The method according to claim 3, wherein before allocating the resources of the current downlink channel according to the quality level of the current downlink channel, the method further comprises: obtaining the quality level of the current downlink channel according to a measurement result of an uplink channel. ### Claim 7 A Long Term Evolution (LTE) downlink control channel resource allocation base station, comprising an information sending module, a determining module and a resource allocating module, wherein the information sending module is configured to send resource scheduling information to a physical layer via a Media Access Control (MAC) layer; the determining module is configured to determine a search space to which resources to be allocated belong according to the resource scheduling information; and the resource allocating module is configured to, when the resources to be allocated belong to a dedicated search space of a User Equipment (UE), allocate the resources of a current downlink channel according to a quality level of the current downlink channel. ### Claim 8 (depends on 7) The base station according to claim 7, wherein the resource allocating module is further configured to, when the resources to be allocated belong to a common search space, allocate the resources of the current downlink channel according to a default Control Channel Element (CCE) allocation value of the common search space. ### Claim 9 (depends on 7) The base station according to claim 7, wherein the resource allocating module comprises: a resource allocating unit, configured to, if the quality level of the current downlink channel is a first predetermined level, set a current CCE allocation value of the current downlink channel in a manner of decreasing progressively in preset time to allocate the resources, based on a CCE allocation value to which the quality level of the current downlink channel corresponds, wherein the current CCE allocation value is greater than or equal to the minimum threshold; and if the quality level of the current downlink channel is a second predetermined level, set the current CCE allocation value of the current downlink channel in a manner of increasing progressively in preset time to allocate the resources, based on a default CCE allocation value of the dedicated search space of the UE or the CCE allocation value to which the quality level of the current downlink channel corresponds, wherein the current CCE allocation value is less than or equal to the maximum threshold. ### Claim 10 (depends on 9) The base station according to claim 9, wherein the resource allocating module further comprises: a quality obtaining unit, configured to obtain the quality level of the current downlink channel according to a Channel Quality Indicator (CQI) index fed back by the UE or a Block Error Ratio (BLER) of Hybrid Automatic Repeat Request (HARQ) transmission or a measurement result of an uplink channel. ### Claim 11 (depends on 2) The method according to claim 2, wherein allocating the resources of the current downlink channel according to the quality level of the current downlink channel comprises: if the quality level of the current downlink channel is a first predetermined level, setting a current CCE allocation value of the current downlink channel in a manner of decreasing progressively in preset time to allocate the resources, based on a CCE allocation value to which the quality level of the current downlink channel corresponds, wherein the current CCE allocation value is greater than or equal to the minimum threshold; and if the quality level of the current downlink channel is a second predetermined level, setting the current CCE allocation value of the current downlink channel in a manner of increasing progressively in preset time to allocate the resources, based on a default CCE allocation value of the dedicated search space of the UE or the CCE allocation value to which the quality level of the current downlink channel corresponds, wherein the current CCE allocation value is less than or equal to the maximum threshold. ### Claim 12 (depends on 11) The method according to claim 11, wherein before allocating the resources of the current downlink channel according to the quality level of the current downlink channel, the method further comprises: obtaining the quality level of the current downlink channel according to a CQI index fed back by the UE. ### Claim 13 (depends on 11) The method according to claim 11, wherein before allocating the resources of the current downlink channel according to the quality level of the current downlink channel, the method further comprises: obtaining the quality level of the current downlink channel according to a BLER of HARQ transmission. ### Claim 14 (depends on 11) The method according to claim 11, wherein before allocating the resources of the current downlink channel according to the quality level of the current downlink channel, the method further comprises: obtaining the quality level of the current downlink channel according to a measurement result of an uplink channel. ### Claim 15 (depends on 8) The base station according to claim 8, wherein the resource allocating module comprises: a resource allocating unit, configured to, if the quality level of the current downlink channel is a first predetermined level, set a current CCE allocation value of the current downlink channel in a manner of decreasing progressively in preset time to allocate the resources, based on a CCE allocation value to which the quality level of the current downlink channel corresponds, wherein the current CCE allocation value is greater than or equal to the minimum threshold; and if the quality level of the current downlink channel is a second predetermined level, set the current CCE allocation value of the current downlink channel in a manner of increasing progressively in preset time to allocate the resources, based on a default CCE allocation value of the dedicated search space of the UE or the CCE allocation value to which the quality level of the current downlink channel corresponds, wherein the current CCE allocation value is less than or equal to the maximum threshold. ### Claim 16 (depends on 15) The base station according to claim 15, wherein the resource allocating module further comprises: a quality obtaining unit, configured to obtain the quality level of the current downlink channel according to a CQI index fed back by the UE or a BLER of HARQ transmission or a measurement result of an uplink channel.