# US 5,708,973 A · Radio system with frequency optimization > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,708,973 A - Document ID: US5708973A - Status: Granted - Kind: A - Application number: 08/281,038 - Filed: 1994-07-27 - Granted: 1998-01-13 - Earliest claimed: 1993-07-27 - Assignees: Siemens Aktiengesellschaft - Inventors: Gerhard Ritter - Web page: https://patentgrep.com/patent/US5708973A ## CPC - H04W 72/542: using measured or perceived quality - H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - 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) ## Abstract A radio system having frequency optimization, particularly a mobile radio telephone system having base stations and subscribers (low speed mobile stations or stationary stations) is provided. In order to avoid fluctuations and interruptions of the reception level, the invention provides that the reception level and/or transmission quality of all frequencies or channels or of a part of the frequencies or channels of the channels available in a base station are constantly measured in every subscriber station (mobile station or stationary station). The measured values are communicated to the base stations wherein the frequencies or channels are allocated to the subscribers based on the overall information so that an optimally optimum frequency or transmission quality is allocated to each connection. ## Claims ### Claim 1 A method of optimizing frequencies used for a plurality of communication channels in a mobile radio telephone system having base stations and low speed mobile subscriber stations having measuring means and stationary subscriber stations having measuring means, said system having a reception side and a transmission side, the method comprising the steps of: continuously measuring a reception level value and a quality of transmission value of at least one frequency of each of said plurality of communication channels used by said base stations by said measuring means in each of said mobile subscriber stations and said stationary subscriber stations; transmitting said measured reception level and quality of transmission values from said subscriber stations to said base stations; using said measured values for selecting a channel by said base stations for allocating a connection of the selected channel of said plurality of communication channels such that the selected channel has an optimum of said measured values to said subscriber stations; and wherein a multi-stage phase modulation is used in said transmissions and the multi-stage phase modulation is further defined by using a gray coding having a transmission of individual, transmitted values as a differential coding; and providing a waiting time period for a transient response of a transmission channel before evaluating a transmission of a symbol. ### Claim 2 (depends on 1) A method according to claim 1, wherein said step of using a multi-stage phase modulation in said transmissions is further defined by using a Gray encoding for the transmission of individual values as a specific phase value. ### Claim 3 (depends on 1) A method according to claim 1, wherein said step of providing a waiting time period for a transient response is further defined by using an amplitude-wise transition for said base stations and using a controlled phase transition before said waiting time period for the transient response of a channel for said mobile subscriber stations to limit the spectrum. ### Claim 4 (depends on 1) A method according to claim 1, wherein said step of providing a waiting time period for a transient response is further defined by using an amplitude-wise transition for said base stations and using an amplitude transition before said waiting time period for the transient response of a channel for said mobile subscriber stations to limit the spectrum. ### Claim 5 (depends on 1) The method according to claim 1, further comprising the step of: using an FFT (fast Fourier transform) for simultaneous evaluation of said plurality of channels at said reception side of said system. ### Claim 6 (depends on 1) A method according to claim 1, further comprising the step of: using an IFFT (inverse fast Fourier transform) at said transmission side of said system to generate transmission signals for a plurality of channels. ### Claim 7 (depends on 1) A method according to claim 1, further comprising the step of: using a time-division duplex method for said transmissions. ### Claim 8 (depends on 1) A method according to claim 1, further comprising the step of: using a frequency-division duplex method for said transmissions. ### Claim 9 (depends on 1) A method according to claim 1, further comprising the step of: cyclically transmitting said measured values for a plurality of frequencies to said base stations from each of said mobile subscriber stations. ### Claim 10 A frequency optimizing mobile radio telephone system having base stations and low speed mobile subscriber stations and stationary subscriber stations, the system comprising: means for continuously measuring a reception level of transmissions between said base stations and said mobile subscriber stations and stationary subscriber stations; means for transmitting said measured values from said subscriber stations to said base stations; and said base stations further having means for selecting a channel and allocating a connection of the selected channel of said plurality of channels having an optimum of said measured values to said subscriber stations. ### Claim 11 (depends on 10) The apparatus of claim 10, further comprising a multi-stage phase modulation means for generating said transmissions. ### Claim 12 (depends on 10) The apparatus of claim 10, further comprising: an FFT (fast Fourier transform) means for simultaneously evaluating said plurality of channels. ### Claim 13 (depends on 10) The apparatus of claim 10, further comprising: an IFFT (inverse fast Fourier transform) means for generating transmission signals for a plurality of channels. ### Claim 14 (depends on 10) The apparatus of claim 10, further comprising: means for cyclically transmitting said measured values for a plurality of frequencies to said base stations from each of said mobile subscriber stations. ### Claim 15 A method of optimizing the frequencies used for communication channels in a mobile radio telephone system having one or more base stations and low speed mobile subscriber stations and stationary subscriber stations, the method comprising the steps of: continuously measuring the received level and the quality of transmission of all of the frequencies in use by an affiliated base station in each of said mobile subscriber stations and said stationary subscriber stations; transmitting said measured received level and quality of transmission from said subscriber stations to said base station; and using said base station to allocate communication channels for each subscriber station based upon said measured received level and quality of transmission such that the communication channels use an optimum frequency for the communication with each of said subscribers.