ADAPTIVE SILENCING MECHANISM FOR DEVICE-TO-DEVICE (D2D) DISCOVERY
First Claim
1. User equipment (UE) enabled for proximity services (ProSe), the ProSe-enabled UE comprising hardware circuitry configured to:
- receive device-to-device (D2D) discovery-zone-configuration information from an enhanced node B (eNB) to indicate time and frequency resources and a periodicity of a discovery zone and to indicate one or more discovery zone operational parameters;
monitor a first discovery period of a D2D discovery zone for D2D discovery signals transmitted by other UEs;
receive discovery packets in the first discovery period from the other UEs;
estimate a loading condition within the first discovery period;
adapt a silencing factor based on the estimated loading condition within the first discovery period, where the silencing factor comprises a probability that the UE will not transmit a D2D discovery signal in a second discovery period that follows the first discovery period.
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Accused Products
Abstract
Novel adaptive silencing schemes for device-to-device (D2D) discovery based on loading conditions in a discovery zone are disclosed herein. These adaptive silencing schemes can be used to mitigate interference and data collisions in networks where D2D connections can be formed. In some embodiments, a silencing factor is used to probabilistically determine whether a user equipment (UE) will transmit one or more D2D discovery signals in the discovery zone. Loading conditions in a current discovery zone can be estimated using several different approaches and metrics described herein. The silencing factor can be increased or decreased for a subsequent discovery zone based on the values of one or more of the metrics described herein for the current discovery zone.
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Citations
28 Claims
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1. User equipment (UE) enabled for proximity services (ProSe), the ProSe-enabled UE comprising hardware circuitry configured to:
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receive device-to-device (D2D) discovery-zone-configuration information from an enhanced node B (eNB) to indicate time and frequency resources and a periodicity of a discovery zone and to indicate one or more discovery zone operational parameters; monitor a first discovery period of a D2D discovery zone for D2D discovery signals transmitted by other UEs; receive discovery packets in the first discovery period from the other UEs; estimate a loading condition within the first discovery period; adapt a silencing factor based on the estimated loading condition within the first discovery period, where the silencing factor comprises a probability that the UE will not transmit a D2D discovery signal in a second discovery period that follows the first discovery period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A user equipment (UE) enabled for proximity services (ProSe), the ProSe-enabled UE comprising hardware circuitry configured to:
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receive device-to-device (D2D) discovery zone configuration information from an enhanced node B (eNB) to indicate time and frequency resources and a periodicity of the discovery zone and to indicate one or more discovery zone operational parameters; monitor a first discovery period of a D2D discovery zone for D2D discovery signals transmitted by other UEs; receive discovery packets in the first discovery period from the other UEs; quantify a loading condition within the first discovery period using a function, wherein the loading condition is associated with a metric; and adapt a silencing factor based on the quantified loading condition within the first discovery period, wherein the silencing factor comprises the probability that the UE will not transmit a D2D discovery signal in a second discovery period that follows the first discovery period. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. User equipment (UE) enabled for proximity services (ProSe), the ProSe-enabled UE comprising hardware circuitry configured to:
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receive device-to-device (D2D) discovery zone configuration information from an enhanced node B (eNB) to indicate a location of a discovery zone; monitor the discovery zone for D2D discovery signals transmitted by other UEs; receive discovery packets in the discovery zone from the other UEs; transmit a discovery signal in a first discovery period of the discovery zone; and retransmit the discovery signal in one or more subsequent discovery periods, wherein the hardware circuitry is configured to probabilistically elect whether to retransmit the discovery signal in the one or more subsequent discovery periods based on a conditional silencing probability, the conditional silencing probability being dynamically adjusted based on a number of times the discovery signal has been previously transmitted in the discovery zone. - View Dependent Claims (28)
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Specification