# US 2014/0192706 A1 · Method and System for Frequency Reuse in Wireless Relay Scenario > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192706 A1 - Document ID: US20140192706A1 - Status: Published application - Kind: A1 - Application number: 14/234,730 - Filed: 2011-12-12 - Published: 2014-07-10 - Earliest claimed: 2011-07-25 - Assignees: Zte Corporation - Inventors: Yanlong Wang; Yongyu Chang; Jie Gao; Yun Zhu - Web page: https://patentgrep.com/patent/US20140192706A1 ## CPC - H04W 72/52: based on load - H04W 16/04: Traffic adaptive resource partitioning - H04W 74/0866: {using a dedicated channel for access} - H04W 84/047: {using dedicated repeater stations} - 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 provides a method for frequency reuse in a wireless relay scenario, wherein a center frequency spectrum, an edge frequency spectrum and a random access frequency spectrum are pre-allocated to a cell according to a scenario parameter in the cell; load conditions of all mobile stations (MSs) covered by each relay station (RS) in the cell is calculated and reported to a base station (BS); the BS allocates the random access frequency spectrum to an RS according to load conditions of all RSs and schedules MSs. The disclosure also provides a system for frequency reuse in a wireless relay scenario. With the method and system above, the frequency spectrum planning is configurable, the random access frequency spectrum is introduced, and both the load balancing and user fairness are taken into consideration, which improves the throughput at the edge of the cell, especially can increase the throughput for the users whose throughput ranks poorly. ## Claims ### Claim 1 A method for frequency reuse in a wireless relay scenario, comprising: pre-allocating a center frequency spectrum, an edge frequency spectrum and a random access frequency spectrum to a cell according to a scenario parameter in the cell; calculating load conditions of all mobile stations (MSs) covered by each relay station (RS) in the cell and reporting the load conditions to a base station (BS); the BS allocating the random access frequency spectrum to an RS according to load conditions of all RSs and scheduling an MS. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein before calculating the load conditions of all the MSs covered by each RS in the cell, the method further comprises: distinguishing an MS accessing through an RS from all MSs in the cell. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein after pre-allocating the center frequency spectrum, the edge frequency spectrum and the random access frequency spectrum, the method further comprises: judging whether a preset time arrives, if the preset time arrives, calculating the load conditions of all the MSs covered by each RS in the cell, or distinguishing an MS accessing through an RS from all MSs in the cell; otherwise, maintaining wideband resources of the RSs. ### Claim 4 (depends on 1) The method as claimed in claim 1, wherein the scenario parameter in the cell comprises: the number of the RSs in the cell, positions of the RSs in the cell, a frame type of the cell, and statistic characteristics of users of the cell. ### Claim 5 (depends on 1) The method as claimed in claim 1, wherein the BS allocating the random access frequency spectrum to each RS according to the load conditions of all the RSs comprises: the BS sorting all the RSs according to the load conditions; calculating a relative load factor of each RS according to a load factor of an RS with a lightest load; according to the relative load factor; calculating a probability that the random access frequency spectrum is allocated to each RS, and allocating the random access frequency spectrum to an RS with a highest probability. ### Claim 6 (depends on 1) The method as claimed in claim 1, wherein scheduling the MS is embodied as: scheduling the MS by means of a proportional fairness scheduling algorithm. ### Claim 7 A system for frequency reuse in a wireless relay scenario, comprising a base station (BS) and one or more relay stations (RSs), wherein the BS is configured to pre-allocate a center frequency spectrum, an edge frequency spectrum and a random access frequency spectrum to a cell according to a scenario parameter in the cell, allocate the random access frequency spectrum to an RS according to load conditions of all RSs and schedule a mobile station (MS); the RS is configured to calculate load conditions of all MSs covered by each RS in the cell and report the load conditions to the BS. ### Claim 8 (depends on 7) The system as claimed in claim 7, wherein the BS is further configured to distinguish an MS accessing through an RS from all MSs in the cell. ### Claim 9 (depends on 7) The system as claimed in claim 7, wherein the BS is further configured to judge whether a preset time arrives, if the preset time arrives, calculate the load conditions of all the MSs covered by each RS in the cell, or distinguish an MS accessing through an RS from all MSs in the cell; otherwise, maintain wideband resources of the RSs. ### Claim 10 (depends on 7) The system as claimed in claim 7, wherein the scenario parameter in the cell comprises: the number of the RSs in the cell, positions of the RSs in the cell, a frame type of the cell, and statistic characteristics of users of the cell. ### Claim 11 (depends on 7) The system as claimed in claim 7, wherein the BS allocating the random access frequency spectrum to each RS according to the load conditions of all the RSs comprises: the BS sorting all the RSs according to the load conditions; calculating a relative load factor of each RS according to a load factor of an RS with a lightest load; according to the relative load factor, calculating a probability that the random access frequency spectrum is allocated to each RS, and allocating the random access frequency spectrum to an RS with a highest probability. ### Claim 12 (depends on 2) The method as claimed in claim 2, wherein after pre-allocating the center frequency spectrum, the edge frequency spectrum and the random access frequency spectrum, the method further comprises: judging whether a preset time arrives, if the preset time arrives, calculating the load conditions of all the MSs covered by each RS in the cell, or distinguishing an MS accessing through an RS from all MSs in the cell; otherwise, maintaining wideband resources of the RSs. ### Claim 13 (depends on 2) The method as claimed in claim 2, wherein the scenario parameter in the cell comprises: the number of the RSs in the cell, positions of the RSs in the cell, a frame type of the cell, and statistic characteristics of users of the cell. ### Claim 14 (depends on 2) The method as claimed in claim 2, wherein the BS allocating the random access frequency spectrum to each RS according to the load conditions of all the RSs comprises: the BS sorting all the RSs according to the load conditions; calculating a relative load factor of each RS according to a load factor of an RS with a lightest load; according to the relative load factor; calculating a probability that the random access frequency spectrum is allocated to each RS, and allocating the random access frequency spectrum to an RS with a highest probability. ### Claim 15 (depends on 2) The method as claimed in claim 2, wherein scheduling the MS is embodied as: scheduling the MS by means of a proportional fairness scheduling algorithm. ### Claim 16 (depends on 8) The system as claimed in claim 8, wherein the BS is further configured to judge whether a preset time arrives, if the preset time arrives, calculate the load conditions of all the MSs covered by each RS in the cell, or distinguish an MS accessing through an RS from all MSs in the cell; otherwise, maintain wideband resources of the RSs. ### Claim 17 (depends on 8) The system as claimed in claim 8, wherein the scenario parameter in the cell comprises: the number of the RSs in the cell, positions of the RSs in the cell, a frame type of the cell, and statistic characteristics of users of the cell. ### Claim 18 (depends on 8) The system as claimed in claim 8, wherein the BS allocating the random access frequency spectrum to each RS according to the load conditions of all the RSs comprises: the BS sorting all the RSs according to the load conditions; calculating a relative load factor of each RS according to a load factor of an RS with a lightest load; according to the relative load factor, calculating a probability that the random access frequency spectrum is allocated to each RS, and allocating the random access frequency spectrum to an RS with a highest probability.