Rank adaptation for an open loop multi-antenna mode of wireless communication
First Claim
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1. A method of performing rank adaptation for a mobile station in a wireless network, comprising:
- determining, by one of the mobile station and a base station, a velocity of the mobile station;
in response to determining that the velocity of the mobile station is above a predefined threshold, selecting an open loop multi-antenna mode to perform wireless communication between the mobile station and the base station;
selecting from among plural ranks for the wireless communication according to the open loop multi-antenna mode between the mobile station and the base station, wherein selecting from among the plural ranks for the wireless communication according to the open loop multi-antenna mode is based on a long-term signal-to-interference-plus-noise ratio (SINR) of a wireless channel between the mobile station and base station, and wherein selecting from among the plural ranks is further based on whether the long-term SINR exceeds a threshold;
sending, by the mobile station, an indication of a selected rank to the base station; and
receiving, from the base station, an indication of a new rank, wherein the new rank overrides the selected rank, and wherein the new rank is based on a comparison of a number of times a first of the plural ranks were selected to a number of times a second of the plural ranks were selected.
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Abstract
To perform rank adaptation for a mobile station in a wireless network, it is determined whether the mobile station is fast moving. In response to determining that the mobile station is fast moving, an open loop multi-antenna mode is selected to perform wireless communication between the mobile station and a base station. Also, selection is made from among plural ranks for the wireless communication according to the open loop multi-antenna mode between the mobile station and the base station.
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Citations
16 Claims
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1. A method of performing rank adaptation for a mobile station in a wireless network, comprising:
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determining, by one of the mobile station and a base station, a velocity of the mobile station; in response to determining that the velocity of the mobile station is above a predefined threshold, selecting an open loop multi-antenna mode to perform wireless communication between the mobile station and the base station; selecting from among plural ranks for the wireless communication according to the open loop multi-antenna mode between the mobile station and the base station, wherein selecting from among the plural ranks for the wireless communication according to the open loop multi-antenna mode is based on a long-term signal-to-interference-plus-noise ratio (SINR) of a wireless channel between the mobile station and base station, and wherein selecting from among the plural ranks is further based on whether the long-term SINR exceeds a threshold; sending, by the mobile station, an indication of a selected rank to the base station; and receiving, from the base station, an indication of a new rank, wherein the new rank overrides the selected rank, and wherein the new rank is based on a comparison of a number of times a first of the plural ranks were selected to a number of times a second of the plural ranks were selected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15)
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9. A base station comprising:
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an interface to perform wireless communication with a mobile station; and a processor configured to; determine whether the mobile station is a high-velocity mobile station; in response to determining that the mobile station is a high-velocity mobile station, select an open loop multi-antenna mode of communication for downlink data transmitted to the mobile station that does not involve feedback from the mobile station that includes an identifier of a codeword to be used for coding the downlink data; and apply rank adaptation to select from among a plurality of ranks for the communication of downlink data according to the open loop multi-antenna mode of communication, wherein the rank adaptation to select from among the plurality of ranks for the communication of downlink data comprises; receiving an indication from the mobile station regarding selection by the mobile station of a particular rank from among the plurality of ranks, wherein the particular rank was selected by the mobile station based on a long-term signal-to-interference-plus-noise ratio (SINR) of a wireless channel between the base station and the mobile station, and wherein the particular rank was selected by the mobile station further based on whether the long-term SINR exceeds a threshold; and using the received indication to perform the rank adaptation to select from among the plurality of ranks; wherein the rank adaptation to select from among the plurality of ranks is further based on comparing a count of a number of decisions by the mobile station to select a first of the plurality of ranks to a count of a number of decisions by the mobile station to select a second of the plurality of ranks, wherein the rank indicated by the received indication is reflected in the count of the number of decisions of the first rank or second rank, and wherein the selected rank based on the comparing is different than the particular rank received from the mobile station. - View Dependent Claims (10, 11, 12)
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13. A mobile station comprising:
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an interface to perform wireless communication with a base station; and a processor configured to; determine whether a velocity of the mobile station exceeds a predefined threshold; in response to determining that the velocity of the mobile station exceeds the predefined threshold, select an open loop multiple input multiple output (MIMO) mode to perform wireless communication between the mobile station and the base station; use rank adaptation to select from among plural ranks in the wireless communication according to the open loop MIMO mode, wherein selecting from among the plural ranks for the wireless communication according to the open loop multi-antenna mode is based on a long-term signal-to-interference-plus-noise ratio (SINR) of a wireless channel between the mobile station and base station, and wherein selecting from among the plural ranks is further based on whether the long-term SINR exceeds a threshold; send, by the mobile station, an indication of a selected rank to the base station; and receive, from the base station, an indication of a new rank, wherein the new rank overrides the selected rank, and wherein the new rank is based on a comparison of a number of times a first of the plural ranks were selected to a number of times a second of the plural ranks were selected. - View Dependent Claims (14, 16)
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Specification